阅读说明：本技术 混凝土浇注高度实时监测方法及系统 (Concrete pouring height real-time monitoring method and system ) 是由 伍伟 张亮 孙畅 江平 姜云 于 2019-11-27 设计创作，主要内容包括：本发明公开了一种混凝土浇注高度实时监测方法,在浇筑区域内铺设温度传感光纤；通过温度传感光纤对浇筑区域的温度进行实时监测；当水平段上的某个温度检测点采集到的温度数值t1与该点在预设的时间间隔T之前采集到的温度数值t2的差值超过预设差值△t时,记录该点为异常波动点；当该水平段上的异常波动点的数量超过预设值x时,则判断混凝土已覆盖该水平段。本发明还公开了一种混凝土浇注高度实时监测系统,包括温度传感光纤、光纤传感检测单元、实时数据分析处理单元。采用上述技术方案,能够实时监控混凝土浇注全区域的液面高度,光纤布在某个区域即可监测该区域浇注液面高度,特别适用于大型混凝土结构。(The invention discloses a concrete pouring height real-time monitoring method, which comprises the steps of paving a temperature sensing optical fiber in a pouring area, monitoring the temperature of the pouring area in real time through the temperature sensing optical fiber, recording a point as an abnormal fluctuation point when the difference value between a temperature value T1 acquired by a certain temperature detection point on the horizontal segment and a temperature value T2 acquired by the point before a preset time interval T exceeds a preset difference value △ T, and judging that concrete covers the horizontal segment when the number of the abnormal fluctuation points on the horizontal segment exceeds a preset value x.)

1. A concrete pouring height real-time monitoring method is characterized by comprising the following steps:

(1) laying a temperature sensing optical fiber in a pouring area, wherein the temperature sensing optical fiber at least comprises a horizontal section; presetting a plurality of temperature detection points on at least a horizontal section;

(2) during concrete pouring, the temperature of a pouring area is monitored in real time through a temperature sensing optical fiber;

(3) when the difference value between the temperature value T1 acquired from a certain temperature detection point on the horizontal segment and the temperature value T2 acquired before the point in the preset time interval T exceeds the preset difference value △ T, the point is recorded as an abnormal fluctuation point, and when the number of the abnormal fluctuation points on the horizontal segment exceeds the preset value x, the horizontal segment is judged to be covered by the concrete.

2. The method for monitoring the concrete pouring height in real time according to claim 1, characterized in that: in step 1, the temperature sensing optical fiber comprises a plurality of horizontal segments distributed in the vertical direction, and the height value of each horizontal segment is recorded.

3. The method for monitoring the concrete pouring height in real time according to claim 2, characterized in that: in the step 2, when a certain single-poured pouring layer is judged to have covered n horizontal segments with different heights in sequence, an alarm is given, wherein n is a preset value.

4. The method for monitoring the concrete pouring height in real time according to the claim 1 is characterized in that in the step 1, the pouring area is divided into m independent areas from the near to the far in the horizontal direction, namely an area 1 … … area m, wherein m is a preset value, the horizontal sections are distributed in at least the area m, and the abnormal fluctuation point is recorded only when the difference value between the temperature value T1 collected at a certain temperature detection point on the horizontal sections distributed in the area m and the temperature value T2 collected at the point before the preset time interval T exceeds a preset difference value △ T.

5. A concrete pouring height real-time monitoring system is characterized by comprising:

the temperature sensing optical fiber is arranged in the concrete pouring area and is at least partially a horizontal section;

the optical fiber sensing detection unit is used for receiving the optical signal sent by the sensing optical fiber, analyzing the optical signal and at least obtaining temperature information data of each part of the horizontal section, and sending the temperature information data to the real-time data analysis processing unit;

and the real-time data analysis processing unit records that the point is an abnormal fluctuation point when the difference value between the temperature value T1 acquired at a certain position on the horizontal segment and the temperature value T2 acquired before the preset time interval T of the point exceeds a preset difference value △ T, and judges that the horizontal segment is covered by the concrete when the number of the abnormal fluctuation points on the horizontal segment exceeds a preset value x.

6. The concrete placement height real-time monitoring system of claim 5, wherein: the temperature sensing optical fiber comprises a plurality of horizontal sections distributed in the vertical direction.

7. The concrete placement height real-time monitoring system of claim 6, wherein: the height h of the lowest horizontal section from the bottom of the concrete pouring area is less than or equal to 100 mm.

8. The real-time concrete pouring height monitoring system of claim 6, wherein the height difference △ h between two adjacent horizontal sections is less than or equal to 500 mm.

9. The real-time concrete pouring height monitoring system of claim 5, wherein the pouring area is divided into m independent areas from the near to the far in the horizontal direction from the pouring position, namely an area 1 … …, m, wherein m is a preset value, the horizontal segments are distributed in at least the area m, and the real-time data analysis processing unit is used for recording an abnormal fluctuation point when the difference value between a temperature value T1 collected at a certain position on the horizontal segments distributed in the area m and a temperature value T2 collected at the point before a preset time interval T exceeds a preset difference value △ T.

Technical Field

The invention relates to a method and a system for monitoring concrete pouring height in real time, and belongs to the technical field of concrete construction.

Background

In the construction process of medium and large concrete, a method of subsection layered pouring is generally applied, the whole is broken into parts, the working efficiency is improved, and the engineering quality is ensured. In concrete construction specifications, strict requirements are imposed on a segmental and layered pouring method: (1) the layering height is 1.25 times of the length of the action part of the plug-in vibrator, and the layering height is not more than 500 mm; (2) pouring concrete should be continuously carried out, if necessary, the interval time should be shortened as much as possible, and before the initial setting of the front layer concrete, the secondary layer concrete should be poured, and the treatment is carried out according to the construction joint for more than 2 hours; (3) when the upper layer is vibrated, the concrete of the lower layer is inserted by 50mm to eliminate the seam between the two layers. The control of the layering height is particularly important in the segmented layered pouring construction, and the low layering height causes low construction efficiency and wastes manpower and material resources; too high layering leads to insufficient vibration and insufficiently dense concrete; if the seams between layers are obvious, the engineering quality is affected.

In actual concrete subsection layered pouring construction, the control of the layering height depends on the experience of workers and supervision, and a scientific method for monitoring the layering height is lacked. Under the condition that some construction environments are complex, such as construction at night, large construction operation range and poor observation of dense reinforcing steel bars, the layering height of the concrete cannot be judged by human eyes, so that the construction quality of the engineering cannot be controlled. Chinese patent document CN105019483A discloses a real-time measuring device for the concrete pouring height of a immersed tube cast-in-place pile and a use method thereof, wherein a take-up box, a scale, a heavy hammer and a fixed pulley are adopted, and the scale passes through the fixed pulley; the graduated scale passes through the fixed pulley, and one end is connected with the weight and the other end is connected with the take-up box. When the device is used, concrete is poured, a hammer is placed until the free fall is finished, the reading is recorded, and the height is calculated manually. The device has the following defects: the method is only suitable for the special application scene of the cast-in-place pile, and cannot be practical for large-area concrete pouring; the operation is troublesome, the hammer needs to be put again for each test of the perfusion height, and the reading is manually recorded and the height is calculated. Chinese patent document CN204475381U discloses a real-time measuring device for concrete pouring height in cast-in-place large-diameter thin-wall tubular pile construction, which comprises a line box, a steel wire rope and a heavy hammer, wherein a roller shaft for winding and unwinding the steel wire rope is arranged in the line box, the steel wire rope is marked with dimension scales, one end of the steel wire rope is fixed on the roller shaft, the other end of the steel wire rope is connected with the heavy hammer, a damping mechanism which enables the roller shaft to rotate in a take-up direction is arranged on the roller shaft, an acting force generated by the damping mechanism is smaller than the gravity of the heavy hammer. The principle of the patent is similar to CN105019483A, so the disadvantages are the same. Chinese patent document CN104008272A discloses a visual monitoring method for concrete vibration based on computer graphics technology, and its technical scheme can be summarized as follows: firstly, drawing a concrete block, obtaining pouring height and construction bin surface data to form a vertical pouring height map and a construction bin surface plan, then obtaining vibration equipment information in real time, calculating and drawing bin surface plane vibration implementation conditions in the construction bin surface plan, and analyzing and calculating vibration quality monitoring results. However, this method does not provide how to obtain the casting height.

Disclosure of Invention

Therefore, an object of the present invention is to provide a method and a system for monitoring a concrete casting height in real time, which can monitor the concrete casting height in real time.

In order to achieve the purpose, the concrete pouring height real-time monitoring method comprises the following steps of:

(1) laying a temperature sensing optical fiber in a pouring area, wherein the temperature sensing optical fiber at least comprises a horizontal section; presetting a plurality of temperature detection points on at least a horizontal section;

(2) during concrete pouring, the temperature of a pouring area is monitored in real time through a temperature sensing optical fiber;

(3) when the difference value between the temperature value T1 acquired from a certain temperature detection point on the horizontal segment and the temperature value T2 acquired before the point in the preset time interval T exceeds the preset difference value △ T, the point is recorded as an abnormal fluctuation point, and when the number of the abnormal fluctuation points on the horizontal segment exceeds the preset value x, the horizontal segment is judged to be covered by the concrete.

In step 1, the temperature sensing optical fiber comprises a plurality of horizontal segments distributed in the vertical direction, and the height value of each horizontal segment is recorded.

In the step 2, when a certain single-poured pouring layer is judged to have covered n horizontal segments with different heights in sequence, an alarm is given, wherein n is a preset value.

In the step 1, the pouring area is sequentially divided into m independent areas from near to far from the pouring position in the horizontal direction, namely an area 1 … … area m, wherein m is a preset value, the horizontal segments are at least distributed in the area m, and only when the difference value between a temperature value T1 acquired at a certain temperature detection point on the horizontal segment distributed in the area m and a temperature value T2 acquired at the point before a preset time interval T exceeds a preset difference value △ T, the point is recorded as an abnormal fluctuation point.

The invention also provides a concrete pouring height real-time monitoring system, which comprises:

the temperature sensing optical fiber is arranged in the concrete pouring area and is at least partially a horizontal section;

the optical fiber sensing detection unit is used for receiving the optical signal sent by the sensing optical fiber, analyzing the optical signal and at least obtaining temperature information data of each part of the horizontal section, and sending the temperature information data to the real-time data analysis processing unit;

and the real-time data analysis processing unit records that the point is an abnormal fluctuation point when the difference value between the temperature value T1 acquired at a certain position on the horizontal segment and the temperature value T2 acquired before the preset time interval T of the point exceeds a preset difference value △ T, and judges that the horizontal segment is covered by the concrete when the number of the abnormal fluctuation points on the horizontal segment exceeds a preset value x.

The temperature sensing optical fiber comprises a plurality of horizontal sections distributed in the vertical direction.

The height h of the lowest horizontal section from the bottom of the concrete pouring area is less than or equal to 100 mm.

The height difference △ h between two adjacent horizontal sections is less than or equal to 500 mm.

The pouring area is divided into m independent areas from near to far in the horizontal direction from the pouring position, namely an area 1 … … area m, wherein m is a preset value, the horizontal segments are at least distributed in the area m, and the real-time data analysis processing unit is used for recording that a point is an abnormal fluctuation point only when the difference value between a temperature value T1 collected at a certain position on the horizontal segments distributed in the area m and a temperature value T2 collected at the point before a preset time interval T exceeds a preset difference value △ T.

By adopting the technical scheme, the method and the system for monitoring the concrete pouring height in real time use the distributed optical fiber temperature measurement sensing technology to monitor the internal temperature of the concrete, have the advantages of multiple temperature monitoring points, high real-time and accuracy and the like, monitor the liquid level height of the whole concrete pouring area in real time, monitor the pouring liquid level height of the area by arranging the optical fiber in the area, and are particularly suitable for large concrete structures.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a real-time concrete pouring height monitoring system according to the present invention.

FIG. 2 is a graph showing temperature-time variation at a certain temperature detection point.

Detailed Description

The distributed optical fiber temperature measuring sensor (DTS) realizes temperature monitoring according to the sensitivity of an Optical Time Domain Reflectometry (OTDR) principle and a Raman (Raman) scattering effect to temperature, and has the advantages of continuous temperature measurement, real-time temperature measurement, easy laying of optical fibers and adaptation to complex environments. Before concrete placement, the optical fiber is laid down along the steel reinforcing frame, and the environmental temperature is monitored by the DTS. After concrete is poured, the temperature of the optical fiber of the covered concrete is rapidly changed in a short time due to the temperature difference between the concrete temperature and the ambient temperature, and the position where the concrete is poured can be deduced through the phenomenon of rapid temperature change, so that the concrete height and the layering height are calculated.

The invention is described in further detail below with reference to the figures and the detailed description.

As shown in the figure, the invention provides a concrete pouring height real-time monitoring system which comprises a temperature sensing optical fiber, an optical fiber sensing detection unit and a real-time data analysis processing unit.

The temperature sensing optical fiber adopts armored multimode optical fiber, has high strength and can adapt to severe environment on site. Meanwhile, the optical fiber has certain flexibility and is easy to lay. The temperature sensing optical fiber is arranged in a concrete pouring area and includes a plurality of horizontal segments distributed in a vertical direction, and as shown in fig. 1, the plurality of horizontal segments of the temperature sensing optical fiber in the present embodiment are arranged in a reciprocating fashion in the vertical direction.

The optical fiber sensing detection unit is used for receiving the optical signal sent by the sensing optical fiber, analyzing the optical signal and at least obtaining temperature information data of each part of the horizontal section, and is used for sending the temperature information data to the real-time data analysis processing unit. The invention adopts the distributed optical fiber temperature measurement sensing unit, can report the temperature of all optical fibers in real time, has the temperature precision of 0.1 ℃, and has the advantages of high precision, multiple temperature monitoring points and no environmental influence.

The real-time data analysis processing unit is used for recording that the point is an abnormal fluctuation point when the difference value between a temperature value T1 acquired at a certain position on a certain horizontal segment and a temperature value T2 acquired before the point in a preset time interval T (for example, T is 1min) exceeds a preset difference value △ T (for example, △ T is 1 ℃), and judging that the horizontal segment is covered by the concrete when the number of the abnormal fluctuation points on the horizontal segment exceeds a preset value x.

According to the real-time monitoring system for the concrete pouring height, the sensing optical fiber is laid along the reinforcing steel bar frame before concrete pouring, the height h of the lowest horizontal section from the bottom of a concrete pouring area is less than or equal to 100mm in the embodiment, a cement layer which starts pouring is conveniently and quickly monitored, the height difference value of two adjacent horizontal sections is equal, the height difference value △ h is less than or equal to 500mm, and if higher liquid level height judgment precision is required, the height difference value between the adjacent horizontal sections can be reduced.

And the information of the length, the width, the height and the like of the concrete structure body and the trend information of the optical fiber are input into the real-time data analysis and processing unit. And the real-time data analysis processing unit is used for establishing a 3D model of the optical fiber wiring by combining the information.

When concrete is poured, the temperature of the full optical fiber is monitored through a concrete pouring height real-time monitoring system, and the temperature of the full optical fiber is reported at regular intervals.

The real-time data analysis processing unit analyzes the temperature data reported by the sensor and stores the temperature data in a database. A plurality of temperature detection points are appointed on the optical fiber in advance, and the density degree of the temperature detection points can be preset according to needs. The real-time data analysis processing unit checks the temperature monitoring points of all optical fibers, when the current temperature of a certain temperature monitoring point is t1, the database inquires that the temperature of the temperature monitoring point 1 minute before is t2, and when Math.abs (t1-t2) is not less than 1 ℃, the point is recorded as a temperature abnormal fluctuation point. When the server records that the total number of the abnormal temperature fluctuation points on a certain horizontal section exceeds a preset value x, the server considers that the concrete is poured to the height of the horizontal section, and the server informs workers of the concrete liquid level height of the area in real time. X may be a preset value, or a specific value of x may be determined according to a ratio of the total number y of the temperature detection points on the horizontal segment, for example, x may be set to y/2.

In the concrete subsection layering construction process, concrete with the height not more than 500mm is generally poured, after the pouring is finished, workers start vibrating operation, and after the vibrating is finished, the next layer of pouring is carried out. If the upper and lower two adjacent horizontal sections are submerged in the concrete pouring layer in a certain pouring process, the system can give out early warning. Of course, the height difference between the upper horizontal section and the lower horizontal section which are adjacent to each other can be adjusted to adjust the detection precision, and the early warning can be given out only by presetting that the pouring layer submerges a plurality of upper and lower adjacent horizontal sections.

The pouring area is divided into m independent areas from the near to the far in the horizontal direction, namely an area 1 … … area m, wherein m is a preset value, the horizontal section extends into the area 4, the real-time data analysis processing unit is used for recording that the point is an abnormal fluctuation point only when the difference between a temperature value T1 collected at a certain position on the horizontal section distributed in the area m and a temperature value T2 collected at the point before a preset time interval T exceeds a preset difference value △ T.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.