A method for conveying concrete using a negative pressure chute

Abstract

The present invention provides a negative pressure chute concrete conveying method, which comprises a negative pressure chute concrete conveying system arranged above a deep foundation pit structure with a large drop of concrete to be poured, the system comprising a negative pressure vacuum pump, a collecting hopper, a chute, a chute, a flow meter and a central control system, wherein the upper end of the chute is sealedly connected to the negative pressure vacuum pump, the lower end of the chute is connected to one end of the chute, the top opening near the upper end of the chute is sealedly connected to the discharge port of the collecting hopper at the opening, an electric opening and closing valve is provided at the discharge port of the collecting hopper, the flow meter is arranged on the chute, the ready-mixed concrete is concentrated at the collecting hopper, the concrete flows into the chute through the electric opening and closing valve under the action of gravity, and then flows into the pouring bin surface after flowing through the chute, and the concrete flow rate on the chute is measured in real time by the flow meter; the central control system regulates the concrete flow rate according to the concrete flow rate measured by the flow meter, to avoid segregation and pipe blockage caused by excessive pouring speed of the concrete due to its own gravity.

Description

Technical Field

[0001] The invention belongs to the field of concrete pouring construction, and in particular relates to a negative pressure chute concrete conveying method. Background Art

[0002] Chute concrete conveying technology is a technical measure that has been increasingly used in large-volume concrete construction in recent years, and has achieved good results in the pouring of large-volume concrete such as ultra-deep foundation pits of super-high-rise buildings, large concrete dams, bridge piers, etc.

[0003] Driven by its own gravity, concrete slides down in the chute at an accelerated speed. Once the pouring speed is too fast, segregation and pipe blockage are very likely to occur.

[0004] Therefore, rationally controlling the speed of pouring concrete downwards over a large drop is of great significance for improving the quality of concrete construction and ensuring the volume stability of large-volume concrete, and has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] The present invention aims to provide a method for conveying concrete through a negative pressure chute, which solves the problem in the prior art that the red concrete slides down rapidly due to its own gravity, resulting in the segregation of aggregates.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A method for conveying concrete using a negative pressure chute comprises the following steps:

[0008] Step 1: Arrange a negative pressure chute concrete conveying system above a deep foundation pit structure with a large drop for concrete to be poured, the negative pressure chute concrete conveying system comprising: a negative pressure vacuum pump, a collecting hopper, a chute, a chute, a flow meter and a central control system; the chute is erected above the deep foundation pit structure with a large drop for concrete to be poured, the upper end of the chute is sealedly connected to the negative pressure vacuum pump, the lower end of the chute is connected to one end of the chute, the collecting hopper is arranged above the chute, and the top opening of the chute near the upper end is sealedly connected to the discharge port of the collecting hopper at the opening; an electric opening and closing valve is provided at the discharge port of the collecting hopper, the flow meter is arranged on the chute, and the negative pressure vacuum pump, the electric opening and closing valve and the flow meter are respectively connected to and controlled by the central control system;

[0009] Step 2, open the electric opening and closing valve;

[0010] Step 3, allowing the ready-mixed concrete to be concentrated at the aggregate hopper;

[0011] Step 4: Concrete flows into the chute through the electric opening and closing valve under the action of gravity, then flows through the chute and into the casting bin surface. The concrete flow rate on the chute is measured in real time by a flow meter.

[0012] Step 5: The central control system adjusts the concrete flow rate according to the concrete flow rate measured by the flow meter.

[0013] Preferably, in the above-mentioned negative pressure chute concrete conveying system, the central control system controls the concrete flow rate according to the concrete flow rate measured by the flow meter, including:

[0014] When the concrete flow rate exceeds the warning speed, the control system closes the electric opening and closing valve to ensure the sealing of the negative pressure chute. At the same time, the negative pressure vacuum pump is started to form negative pressure in the chute system, effectively controlling the speed of the high-speed falling concrete, reducing the risk of aggregate separation during the concrete falling process, and improving the quality of concrete transportation construction.

[0015] When the concrete flow rate is lower than the warning speed, the control system keeps the electric opening and closing valve open, and the concrete continues to flow into the chute through the discharge port of the aggregate hopper for feeding. At the same time, the negative pressure vacuum pump is closed to increase the concrete sliding speed to avoid slow concrete pouring and affect the construction progress.

[0016] Preferably, in the above-mentioned negative pressure chute concrete conveying system, the chute includes a plurality of pipe bodies, and adjacent pipe bodies are sealedly connected.

[0017] Preferably, in the above-mentioned negative pressure chute concrete conveying system, the flow meter is a radar flow meter.

[0018] Preferably, in the above-mentioned negative pressure chute concrete conveying system, the radar flow meter obtains the flow rate of the concrete by comparing the frequency difference between the electromagnetic waves of a fixed frequency emitted to the concrete and the electromagnetic waves received and reflected from the concrete.

[0019] Preferably, in the above-mentioned negative pressure chute concrete conveying system, the concrete flow rate measured by the flow meter is transmitted to the central control system via a data transmission unit in the form of a 4G or 5G signal.

[0020] Preferably, in the above-mentioned negative pressure chute concrete conveying system, when the concrete flow rate is greater than or equal to 5m / s and less than 10m / s, the pressure of the negative pressure vacuum pump is greater than or equal to 0.03MPa and less than 0.05MPa; when the concrete flow rate is greater than or equal to 10m / s and less than 15m / s, the pressure of the negative pressure vacuum pump is greater than or equal to 0.05MPa and less than 0.07MPa; when the concrete flow rate is greater than or equal to 15m / s and less than 20m / s, the pressure of the negative pressure vacuum pump is greater than or equal to 0.07MPa and less than 0.10Mpa.

[0021] Preferably, in the above-mentioned negative pressure chute concrete conveying system, the chute is made of a rigid wear-resistant material.

[0022] It can be seen from the technical solutions disclosed above that, compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention provides a negative pressure chute concrete conveying method, which is achieved by arranging a negative pressure chute concrete conveying system above a deep foundation pit structure with a large drop in concrete to be poured. The negative pressure chute concrete conveying system includes: a negative pressure vacuum pump, a collecting hopper, a chute, a chute, a flow meter and a central control system. The chute is erected above the deep foundation pit structure with a large drop in concrete to be poured, the upper end of the chute is sealed with the negative pressure vacuum pump, the lower end of the chute is connected to one end of the chute, the collecting hopper is arranged above the chute, and the top opening of the chute near the upper end is sealed with the discharge port of the collecting hopper at the opening, and an electric discharge port is provided at the discharge port of the collecting hopper. The electric opening and closing valve is used, and the flowmeter is arranged on the chute. The negative pressure vacuum pump, the electric opening and closing valve and the flowmeter are respectively connected to the central control system and controlled by it; the electric opening and closing valve is opened; the ready-mixed concrete is concentrated at the aggregate hopper; the concrete flows into the chute through the electric opening and closing valve under the action of gravity, and then flows into the casting bin surface after flowing through the chute, and the concrete flow rate on the chute is measured in real time by the flowmeter; the central control system regulates the concrete flow rate according to the concrete flow rate measured by the flowmeter, so as to avoid segregation and pipe blockage caused by excessive pouring speed of concrete due to its own gravity, effectively improve the quality of concrete construction, and ensure the volume stability of large-volume concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the negative pressure chute concrete conveying system.

[0025] Figure 2 It is an assembly diagram of negative pressure vacuum pump, collecting hopper and chute.

[0026] Figure 3 It is a schematic diagram of the assembly of the electric opening and closing valve in the aggregate hopper.

[0027] Figure 4 This is a schematic diagram of the assembly of the speed meter and slide pipe.

[0028] In the figure: 1-negative pressure vacuum pump, 2-collecting hopper, 3-chute, 4-chute, 5-flow meter, 6-electric opening and closing valve, 7-discharging port, 8-flange. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following examples, combined with the accompanying drawings, will provide a detailed description of the technical content and features of the present invention. It should be noted that the drawings are all in a very simplified form and are not precisely proportioned, and are only used to conveniently and clearly assist in illustrating the purpose of the embodiments of the present invention. For ease of description, the "upper" and "lower" described below are consistent with the upper and lower directions in the accompanying drawings, but this does not constitute a limitation of the technical solution of the present invention.

[0030] See also Figures 1 to 4 This embodiment provides a method for conveying concrete using a negative pressure chute, comprising the following steps:

[0031] Step 1: A negative pressure chute concrete delivery system is arranged above the deep foundation pit structure with a large drop in concrete to be poured. The negative pressure chute concrete delivery system includes: a negative pressure vacuum pump 1, a collecting hopper 2, a chute 3, a chute 4, a flow meter 5 and a central control system (not marked). The chute 3 is set above the deep foundation pit structure with a large drop in concrete to be poured (not marked). The upper end of the chute 3 is sealed with the negative pressure vacuum pump 1, the lower end of the chute 3 is connected to one end of the chute 4, and the collecting hopper 2 is arranged above the chute 3. , and the top opening near the upper end of the chute 3 is sealedly connected to the discharge port 7 of the collecting hopper 2 at the opening. In this embodiment, a flange 8 is adopted between the opening of the chute 3 and the discharge port 7 of the collecting hopper 2, and a flange 8 is adopted to connect the opening near the end of the chute 3 to the discharge port 7 of the collecting hopper 2. An electric opening and closing valve 6 is provided at the discharge port 7 of the collecting hopper 2. The flow meter 5 is arranged on the chute 4. The negative pressure vacuum pump 1, the electric opening and closing valve 6 and the flow meter 5 are respectively connected to and controlled by the central control system;

[0032] Step 2, open the electric opening and closing valve 6;

[0033] Step 3, allowing the ready-mixed concrete to be concentrated at the aggregate hopper 2;

[0034] Step 4: Concrete flows into the chute 3 through the electric opening and closing valve 6 under the action of gravity, then flows through the chute 4 and flows into the casting silo surface. The concrete flow rate on the chute 4 is measured in real time by the flow meter 5;

[0035] Step 5: The central control system adjusts the concrete flow rate according to the concrete flow rate measured by the flow meter 5.

[0036] The present invention provides a negative pressure chute concrete conveying method, which is achieved by laying a negative pressure chute concrete conveying system above a deep foundation pit structure with a large drop in concrete to be poured. The negative pressure chute concrete conveying system includes: a negative pressure vacuum pump 1, a collecting hopper 2, a chute 3, a chute 4, a flow meter 5 and a central control system. The chute 3 is erected above the deep foundation pit structure with a large drop in concrete to be poured. The upper end of the chute 3 is sealedly connected to the negative pressure vacuum pump 1, and the lower end of the chute 3 is connected to one end of the chute 4. The collecting hopper 2 is arranged above the chute 3, and the top opening of the chute 3 near the upper end is sealedly connected to the discharge port 7 of the collecting hopper 2 at the opening. The discharge port 7 of the collecting hopper 2 is provided with a The electric opening and closing valve 6 and the flow meter 5 are arranged on the chute 4. The negative pressure vacuum pump 1, the electric opening and closing valve 6 and the flow meter 5 are respectively connected to the central control system and controlled by it; the electric opening and closing valve 6 is opened; the ready-mixed concrete is concentrated at the aggregate hopper 2; the concrete flows into the chute 3 through the electric opening and closing valve 6 under the action of gravity, and then flows into the casting bin surface after flowing through the chute 4. The concrete flow rate on the chute 4 is measured in real time by the flow meter 5; the central control system regulates the concrete flow rate according to the concrete flow rate measured by the flow meter 5, so as to avoid the concrete from being segregated and blocked due to the excessive pouring speed caused by its own gravity, effectively improving the quality of concrete construction and ensuring the volume stability of large-volume concrete.

[0037] Preferably, in the above-mentioned negative pressure chute concrete conveying system, the central control system regulates the concrete flow rate according to the concrete flow rate measured by the flow meter 5, including:

[0038] When the concrete flow rate exceeds the warning speed, the control system closes the electric opening and closing valve 6 to ensure the sealing of the negative pressure chute 3. At the same time, the negative pressure vacuum pump 1 is started to form a negative pressure in the chute 3 system, effectively controlling the sliding speed of the high-speed falling concrete, reducing the risk of aggregate separation during the concrete falling process, and improving the quality of concrete transportation construction;

[0039] When the concrete flow rate is lower than the warning speed, the control system keeps the electric on-off valve 6 open, and the concrete continues to flow into the chute 3 through the discharge port 7 of the collecting hopper 2 for feeding. At the same time, the negative pressure vacuum pump 1 is closed to increase the concrete sliding speed to avoid slow concrete pouring and affect the construction progress.

[0040] Preferably, in the above-mentioned negative pressure chute concrete conveying system, the chute 3 includes a plurality of pipe bodies, and adjacent pipe bodies are sealed and connected.

[0041] Preferably, in the aforementioned negative pressure chute concrete conveying system, the flowmeter 5 is a radar flowmeter. The radar flowmeter 5 measures the concrete flow rate by comparing the frequency difference between electromagnetic waves of a fixed frequency transmitted toward the concrete and the electromagnetic waves reflected from the concrete. The radar flowmeter 5 enables non-contact measurement of the concrete flow rate with high accuracy.

[0042] Preferably, in the above-mentioned negative pressure chute concrete conveying system, the concrete flow rate measured by the flow meter 5 is transmitted to the central control system through the data transmission unit in the form of 4G or 5G signal, thereby realizing wireless and fast transmission between the radar flow meter 5 and the central control system.

[0043] Preferably, in the above-mentioned negative pressure chute concrete conveying system, the chute 3 is made of a rigid wear-resistant material, thereby avoiding the problem of frequent replacement of the chute 3 due to wear and tear.

[0044] Preferably, in the above-mentioned negative pressure chute concrete delivery system, the central control device controls the concrete flow rate according to the flow meter 5, realizing intelligent self-regulation of concrete delivery construction. The concrete warning speed is evaluated in combination with the workability of the concrete on site. The control criteria for the concrete flow rate are shown in Table 1 below:

[0045] Table 1: Concrete flow rate control criteria

[0046] Concrete flow rate / (m / s) Negative pressure vacuum pump 11 pressure value / (MPa) 5～10 0.03～0.05 10～15 0.05～0.07 15～20 0.07～0.10

[0047] As can be seen from Table 1, the control criteria for concrete flow rate are as follows: when the concrete flow rate is greater than or equal to 5m / s and less than 10m / s, the pressure of the negative pressure vacuum pump 1 is greater than or equal to 0.03MPa and less than 0.05MPa; when the concrete flow rate is greater than or equal to 10m / s and less than 15m / s, the pressure of the negative pressure vacuum pump 1 is greater than or equal to 0.05MPa and less than 0.07MPa; when the concrete flow rate is greater than or equal to 15m / s and less than 20m / s, the pressure of the negative pressure vacuum pump 1 is greater than or equal to 0.07MPa and less than 0.10MPa. The adoption of the above control criteria can not only effectively control the sliding speed of high-speed falling concrete, reduce the risk of aggregate separation during the concrete falling process, and improve the quality of concrete transportation construction, but also avoid slow concrete pouring that affects the construction progress, realize intelligent concrete transportation, significantly improve the quality and efficiency of concrete construction, and ensure the stability of large-volume concrete construction.

[0048] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A method for conveying concrete using a negative pressure chute, characterized in that: The steps include: Step 1: Arrange a negative pressure chute concrete conveying system above a deep foundation pit structure with a large drop for concrete to be poured, the negative pressure chute concrete conveying system comprising: a negative pressure vacuum pump, a collecting hopper, a chute, a chute, a flow meter and a central control system; the chute is erected above the deep foundation pit structure with a large drop for concrete to be poured, the upper end of the chute is sealedly connected to the negative pressure vacuum pump, the lower end of the chute is connected to one end of the chute, the collecting hopper is arranged above the chute, and the top opening of the chute near the upper end is sealedly connected to the discharge port of the collecting hopper at the opening; an electric opening and closing valve is provided at the discharge port of the collecting hopper, the flow meter is arranged on the chute, and the negative pressure vacuum pump, the electric opening and closing valve and the flow meter are respectively connected to and controlled by the central control system; Step 2, open the electric opening and closing valve; Step 3, allowing the ready-mixed concrete to be concentrated at the aggregate hopper; Step 4: Concrete flows into the chute through the electric opening and closing valve under the action of gravity, then flows through the chute and into the casting bin surface. The concrete flow rate on the chute is measured in real time by a flow meter. Step 5: The central control system regulates the concrete flow rate according to the concrete flow rate measured by the flow meter; The central control system controls the concrete flow rate according to the concrete flow rate measured by the flow meter, including: When the concrete flow rate exceeds the warning speed, the control system closes the electric opening and closing valve to ensure the sealing of the negative pressure chute. At the same time, the negative pressure vacuum pump is started to form negative pressure in the chute system, effectively controlling the speed of the high-speed falling concrete, reducing the risk of aggregate separation during the concrete falling process, and improving the quality of concrete transportation construction. When the concrete flow rate is lower than the warning speed, the control system keeps the electric opening and closing valve open, and the concrete continues to flow into the chute through the discharge port of the aggregate hopper for feeding. At the same time, the negative pressure vacuum pump is closed to increase the concrete sliding speed to avoid slow concrete pouring and affect the construction progress.

2. The negative pressure chute concrete delivery method according to claim 1, characterized in that: The slide pipe comprises a plurality of pipe bodies, and adjacent pipe bodies are sealed and connected to each other.

3. The method for conveying concrete using a negative pressure chute according to claim 1, wherein: The current meter is a radar current meter.

4. The method for conveying concrete using a negative pressure chute according to claim 3, wherein: The radar flow meter obtains the flow velocity of the concrete by comparing the frequency difference between the electromagnetic waves of a fixed frequency emitted to the concrete and the electromagnetic waves received and reflected by the concrete.

5. The method for conveying concrete using a negative pressure chute according to claim 3, wherein: The concrete flow rate measured by the flow meter is transmitted to the central control system via a data transmission unit using a 4G or 5G signal.

6. The method for conveying concrete using a negative pressure chute according to claim 1, wherein: When the concrete flow rate is greater than or equal to 5m / s and less than 10m / s, the pressure of the negative pressure vacuum pump is greater than or equal to 0.03MPa and less than 0.05MPa; when the concrete flow rate is greater than or equal to 10m / s and less than 15m / s, the pressure of the negative pressure vacuum pump is greater than or equal to 0.05MPa and less than 0.07MPa; when the concrete flow rate is greater than or equal to 15m / s and less than 20m / s, the pressure of the negative pressure vacuum pump is greater than or equal to 0.07MPa and less than 0.10Mpa.

7. The method for conveying concrete using a negative pressure chute according to claim 1, wherein: The slide pipe is made of rigid wear-resistant material.

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