CN109374065B - Cantilever lever sensing device for early warning of position of concrete conveying conduit for cast-in-place pile construction - Google Patents
Cantilever lever sensing device for early warning of position of concrete conveying conduit for cast-in-place pile construction Download PDFInfo
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- CN109374065B CN109374065B CN201811490487.0A CN201811490487A CN109374065B CN 109374065 B CN109374065 B CN 109374065B CN 201811490487 A CN201811490487 A CN 201811490487A CN 109374065 B CN109374065 B CN 109374065B
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- 239000004567 concrete Substances 0.000 title claims abstract description 91
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 claims description 22
- 239000002002 slurry Substances 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 239000000523 sample Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000007405 data analysis Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a cantilever lever sensing device for early warning of the position of a concrete conveying conduit for cast-in-place pile construction, which consists of a sensing unit 100 and a display control unit 200 in information connection with the sensing unit; the sensing unit has a cantilever probe 111, a load cell 120 and a gyro sensor 121; the device is used for identifying the condition of a medium at the position of a sensor and measuring the inclination angle of the concrete conveying conduit during the operation of the underwater concrete filling pile, and provides guidance for construction operation.
Description
Technical Field
The invention relates to the technical field of concrete pouring construction, in particular to a concrete conveying conduit position early warning cantilever lever sensing device for cast-in-place pile construction.
Technical Field
In the construction process of underwater pouring concrete piles, a concrete delivery conduit method is generally adopted for pouring, namely, concrete mixture enters the bottom of initial poured concrete (serving as a water-resisting layer) through the lower opening of the concrete delivery conduit, and newly poured concrete supports the underwater concrete pouring method that the initial poured concrete rises and expands towards the periphery. The concrete at the bottom of the first poured pile is gradually lifted to the pile head part by the subsequent concrete, so that the concrete at the pile head part of the underwater poured pile is always the part which is poured first. The method is influenced by pile bottom sediment, wall protection slurry, hole wall shape, reinforcement cage and pile length, the rising concrete top layer can be covered with slurry with a certain thickness (slurry, mortar, soil and concrete mixed slurry), in the construction process, the outlet of the concrete conveying conduit must be ensured not to be separated from the concrete layer, otherwise, the soil is mixed with the concrete, and pile breaking construction accidents can be caused, so in the current construction, the depth of the concrete surface must be measured every half an hour, and the total section number length of the concrete conveying conduit is calculated. The outlet position of the concrete conveying conduit is obtained, and the concrete conveying conduit is ensured to be buried under the concrete for 2-6 meters. The shallow pipe orifice is easy to separate from the concrete, so that the pile is broken. Too deep burying, too high pressure, no need of going down fresh concrete, too long old concrete time and easy initial setting, and as a result, pile breaking can be caused. In addition, the inclination degree of the concrete conveying conduit needs to be measured in real time in the lowering process, and the concrete conveying conduit is adjusted in time so as to avoid damage caused by collision with the reinforcement cage.
The casting engineering is very tension, and each link must be in place. At present, no automatic method for measuring the depth of a concrete conveying conduit exists, the whole process is responsible for measurement by utilizing tools such as a heavy hammer and the like by means of a detector, the labor intensity is high, absolute and reliable construction cannot be guaranteed, and once pile breaking accidents are caused, excavation, drilling and working are generally required. Waste is very large.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to design a concrete conveying conduit position early warning cantilever lever sensing device for cast-in-place pile construction, so that the shortcomings of the prior art are overcome.
The object of the present invention is achieved by the following means.
The cantilever lever sensing device for early warning of the position of a concrete conveying conduit for the construction of a cast-in-place pile is fixed at a proper position above a discharge hole of the concrete conveying conduit for the casting operation of a cast-in-place pile cavity in the construction of the cast-in-place pile, and the obtained fluid medium information is used for determining the dynamic position of the interface between concrete and a slurry layer in the cavity, and is characterized by comprising a sensing unit 100 and a display control unit 200 in information connection with the sensing unit; the base 110 of the sensing unit has a triangular structure with a cavity 114, and the load cell 12 is arranged at the top of the cavity 114; the bottom surface of the matrix triangle body is arranged on the concrete conveying conduit 1 through a fixing mechanism; the upper side of the triangle body is provided with a cantilever detection sheet 111, the lower side of the triangle body is provided with a diversion slot 113, and a drain slot 117 on the cantilever detection sheet 111 and the diversion slot 113 on the lower side are communicated with the cavity; the cantilever detecting sheet 111 is a folded arm sheet-shaped object, a top head 116 pushing against the stress surface of the force sensor is arranged on the folded arm, the middle part of the cantilever detecting sheet 111 is fixed on the triangle body through a hinge shaft 115 and can rotate around the hinge shaft 115, thus, the cantilever detecting sheet 111 and the top head 116 acting on the force sensor form a lever force transmission mechanism capable of transmitting the rotation stress of the detecting sheet by taking the hinge shaft 115 as a fulcrum; the load cell 120 transmits the measured value and the concrete delivery pipe inclination value to the display control unit 200 through the communication cable, thereby controlling and guiding the construction work of the cast-in-place pile.
Further, the slot sizes of the leakage slot 117 and the diversion slot 113 are based on that the slurry is allowed to enter and the coarse aggregate in the plastic concrete is blocked from entering; the dimensions of the leakage grooves 117 and the flow guiding grooves 113 are smaller than the individual dimensions of coarse aggregate stones used for the actual plastic concrete on site.
Further, an inclination sensor is provided in the triangle body of the sensing unit 100. Typically, the inclination sensor may employ a gyro sensor 121.
The load cell 120 and the gyro sensor 121 transmit the measured value and the inclination value of the concrete delivery pipe to the display control unit 200 through the communication cable, and the control unit recognizes the medium condition at the sensor position and the inclination condition of the concrete delivery pipe by analyzing the measured value variation and the inclination value variation, thereby controlling and guiding the construction operation of the cast-in-place pile.
The sensing unit and the display control unit are connected through a cable and a connector. The sensing unit mainly comprises a cantilever detecting sheet, an inclination sensor and a force transducer. The display control unit consists of a power supply module, a data analysis module, a display module, a communication module, an input interface and an output control interface.
The triangular shape of the sensing unit enables the concrete conveying conduit 1 to move up and down in the concrete, so that the concrete conveying conduit has small resistance and good flow guiding effect.
When the concrete pump is used, the sensing unit is fixed at a certain distance (such as 2-6 meters) from the outlet of the concrete conveying conduit through the fixing device 2, and when the concrete conveying conduit 1 rises along with the rising of concrete in the pouring process, if the sensing unit is in a concrete environment, the acting force of the cantilever detection sheet 111 and aggregate in the concrete on the force sensor is larger due to the action of the cantilever detection sheet 111 and the aggregate in the concrete, so that the display control unit 200 can judge that the position 2-6 meters above the outlet of the concrete conveying conduit is still concrete according to the acting force of the force sensor, and the safety state is displayed; if the sensing unit is in a slurry environment or water environment, the slurry and water can pass through the sensor through the opening of the cantilever detection piece, and the acting force of the cantilever detection piece is very small, so the display control unit 200 can judge that the position 2-6 meters above the outlet of the concrete conveying conduit is not concrete according to the acting force, display an alarm state and guide constructors to adjust in time.
In the process of lowering and lifting the concrete conveying conduit, the gyroscope sensor can measure the inclination angle of the concrete conveying conduit in real time, if the inclination angle exceeds the allowable range, the situation of collision with the reinforcement cage can possibly occur, and the display control unit 200 can send an alarm signal to guide constructors to adjust in time according to the inclination angle.
By adopting the structure of the invention, in the operation process of the underwater concrete cast-in-place pile, on-site operators can be effectively guided to finish the lowering and lifting operation of the concrete conveying guide pipe, thereby playing the roles of guaranteeing the quality and avoiding construction accidents.
Description of the drawings:
FIG. 1 is a schematic sectional view showing an installation state of a sensing unit of the present invention.
Fig. 2 shows a schematic diagram of the composition of the control unit according to the invention.
Fig. 3 is a schematic perspective view of the structure of the sensing unit of the present invention.
Fig. 4 is an enlarged view of a portion of fig. 3.
FIG. 5 is a schematic diagram of the working environment of the load cell at various stages in an embodiment of the invention: figure a, when the position of the concrete conveying conduit is normal; b, when the position of the concrete conveying conduit is abnormal; c, when the inclination angle of the concrete conveying conduit is within the allowable range; and d, when the inclination angle of the concrete conveying conduit exceeds the allowable range.
FIG. 6 is a schematic diagram of an interface of a display control unit according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention relates to a concrete conveying conduit position early warning cantilever lever sensing device for cast-in-place pile construction, which is used for assisting in guiding the construction of underwater cast-in-place piles.
As can be seen from fig. 1, the display control unit 200 is composed of a sensing unit 100 and a display control unit connected with the sensing unit in an information manner; the sensing unit has a cantilever probe 111, a load cell 120 and a gyro sensor 121; the base 110 of the sensing unit is vertically arranged, a force sensor 120 and a gyroscope sensor 121 are arranged in the base 110, a hinge shaft 115 for lever transmission is arranged, the base 110 is designed into a triangle shape and is convenient to move in a medium, a diversion slot 113 which is matched with the cantilever detection sheet 111 to form a triangular diversion structure is arranged in the base, the cantilever detection sheet 111 can rotate around the hinge shaft 115 of the hinge assembly, the cantilever detection sheet 111 is provided with a top 116 which is propped against the stress surface of the force sensor, and a lever force transmission mechanism which can transmit the rotation stress of the detection sheet is formed by the hung cantilever detection sheet and the top which acts on the force sensor; the probe sheet 111 is provided with a groove 117 for allowing the slurry to enter and blocking the coarse aggregate in the plastic concrete.
The force sensor 120 and the gyroscope sensor 121 transmit the measured value and the inclination value of the concrete conveying conduit to the display control unit 200 through the communication cable and the interface 130, and the display control unit 200 is composed of a power supply module 201, a data analysis module 202, a display module 203, a communication module 204, an input interface 205 and an output control interface 206. The medium condition at the position of the sensor and the inclination condition of the concrete conveying conduit are identified by analyzing the measured value variation and the inclination value variation, so that the construction operation of the cast-in-place pile is controlled and guided.
Example 1: the sensing unit 100 adopts the structure of fig. 2: a load cell 120, a gyroscopic sensor 121, a flow guide slot 113 arranged in a triangle, and a cantilever probe 111 connected to the base through a hinge 115 are installed in the base 110. The slotted notch 117 on the probe 111 is designed to be 8mm and the slotted notch of the deflector is designed to be 6mm (considering the size of the block in the concrete between 10mm and 60 mm).
In actual use, one end of the slot of the cantilever detection sheet 111 (as shown in fig. 3 and 4) is arranged at an angle of 30 degrees, and is used for acting with a medium (concrete or slurry at the upper part of the concrete), force is transmitted to the force sensor 120 through the hinge 115 and the plug 116, the other end (the end provided with the plug 116) of the cantilever detection sheet 111 is restrained in the matrix, the rotation of the whole detection sheet is restrained within a small angle range, and when the detection sheet moves in the concrete, the aggregate in the concrete acts with the detection sheet, and the acting force is larger; when the detecting piece moves in the floating slurry or water, the floating slurry or water only acts with the edge of the detecting piece, and the acting force is small.
In practical use, various types of force transducers and gyroscopic sensors can be adopted, a thin film resistor is adopted as the force transducer in our experimental device, the gyroscopic sensor with the model of mpu6050 is adopted, experimental environments are arranged, the positions of the sensors are respectively in concrete environments, slurry environments and water environments, three states of vertical concrete conveying pipes, 3-degree inclination of the concrete conveying pipes and 10-degree inclination of the concrete conveying pipes are arranged, and the test results are shown in the following table:
referring to fig. 5, an inclination sensor 121 is disposed in the triangle body of the sensing unit 100, when the concrete conveying conduit is inclined to a certain extent, the signal transmitted by the inclination sensor changes, for example, when the resistance value acquired by the monitoring machine in this embodiment is 400kΩ to infinity, it can be determined that the sensor probe is in a water environment or a slurry environment, and an alarm is required; when the resistance value acquired by the monitoring machine is 0k omega-400 k omega, the sensor probe can be judged to be in a concrete environment, and safety needs to be displayed; when the output value of the gyroscope is within 10 degrees, the display is required to be safe, and when the output value exceeds 10 degrees, the alarm is required.
The monitor is shown in fig. 6, and the interface display conditions are as follows:
in summary, the concrete conveying conduit position early warning cantilever lever sensing device for the cast-in-place pile construction is feasible. The device can identify the medium condition at the position of the sensor during the operation of the underwater concrete cast-in-place pile, measure the inclination angle of the concrete conveying conduit and guide the cast-in-place construction operation.
While the foregoing detailed description of the preferred embodiments will be understood by those of ordinary skill in the art that the embodiments described herein are presented to aid the reader in understanding the principles of the invention, and are to be construed as limiting the scope of the invention to such specifically recited and embodiments. All possible equivalents or modifications from the above description are considered to be within the scope of the claims.
Claims (1)
1. The cantilever lever sensing device for early warning of the position of a concrete conveying conduit for the construction of a cast-in-place pile is fixed at a proper position above a discharge hole of the concrete conveying conduit for the casting operation of a cast-in-place pile cavity in the construction of the cast-in-place pile, and the obtained fluid medium information is used for determining the dynamic position of the interface between concrete and a slurry layer in the cavity, and is characterized by comprising a sensing unit (100) and a display control unit (200) in information connection with the sensing unit; the sensing unit base body (110) is of a triangular structure with a cavity, and the force transducer (120) is arranged at the top of the cavity; the bottom surface of the triangle body is arranged on the concrete conveying conduit (1) through a fixing mechanism; the upper side of the triangle body is provided with a cantilever detection sheet (111), the lower side of the triangle body is provided with a diversion slot (113), and a drain slot (117) on the cantilever detection sheet (111) and the diversion slot (113) on the lower side are communicated with the cavity; the cantilever detection piece (111) is a folded arm sheet-shaped object, a top head (116) pushing against the stress surface of the force sensor is arranged on the folded arm, the middle part of the cantilever detection piece (111) is fixed on the triangle body through a hinge shaft (115) and can rotate around the hinge shaft, thus, the cantilever detection piece (111) and the top head (116) acting on the force sensor form a lever force transmission mechanism capable of transmitting the rotation stress of the detection piece by taking the hinge shaft (115) as a fulcrum; the force transducer (120) transmits the measured value and the inclination value of the concrete conveying conduit to the display control unit 200 through the communication cable, so as to control and guide the construction operation of the cast-in-place pile; the slot sizes of the leakage slot (117) and the diversion slot (113) are based on that the slurry is allowed to enter and the coarse aggregate in the plastic concrete is blocked from entering; the dimensions of the leakage grooves (117) and the grooving dimensions of the diversion grooves (113) are smaller than the individual dimensions of coarse aggregate stones used for the actual plastic concrete in the field; an inclination sensor is arranged in the triangle body of the sensing unit (100).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811490487.0A CN109374065B (en) | 2018-12-07 | 2018-12-07 | Cantilever lever sensing device for early warning of position of concrete conveying conduit for cast-in-place pile construction |
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| CN201811490487.0A CN109374065B (en) | 2018-12-07 | 2018-12-07 | Cantilever lever sensing device for early warning of position of concrete conveying conduit for cast-in-place pile construction |
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| CN110081950B (en) * | 2019-04-29 | 2020-02-18 | 西南交通大学 | Single-blade double-contact sensor device for identifying flowing concrete |
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