A box girder prestressed tensioning and grouting early warning system

Abstract

This utility model discloses a prestressed tensioning and grouting early warning system for box girders, including a box girder, a tensioning mechanism, a grouting mechanism, a monitoring module, and an early warning module. The box girder is equipped with prestressing tendons and corrugated pipes, with the prestressing tendons embedded within the box girder and the corrugated pipes fitted over the prestressing tendons. The tensioning mechanism includes a jack, a pad, and an anchor plate. The first side of the pad is installed at the opening of the box girder and connected to the corrugated pipe, while the anchor plate is installed on the second side of the pad. The jack is connected to the anchor plate. The grouting mechanism is connected to the box girder for injecting grout into the corrugated pipes. The monitoring module includes a tension pressure sensor, a displacement sensor, a grouting pressure sensor, and an electromagnetic flow sensor. The tension pressure sensor is located inside the jack, the displacement sensor is located in the prestressing tendon, the grouting pressure sensor is located on the corrugated pipe, and the electromagnetic flow sensor is located on the corrugated pipe. The early warning module includes a central control terminal and an alarm electrically connected to the central control terminal.

Description

Technical Field

[0001] This utility model relates to the field of building construction monitoring technology, and in particular, to an early warning system for prestressed tensioning and grouting of box girders. Background Technology

[0002] In modern bridge construction, prestressed concrete technology is one of the key technologies for improving bridge structural performance and extending service life. Especially in the construction of long-span bridges, prestressed concrete box girders are widely used due to their excellent load-bearing capacity and economic benefits. The introduction of prestressing, through pre-applied tension, resists tensile stress under future loads, thereby improving the performance of concrete and the stability of the structure. In the construction process of prestressed concrete structures, tensioning the prestressing tendons and grouting are two crucial steps.

[0003] The purpose of tensioning prestressed tendons is to pre-introduce prestress within the concrete structure, while grouting is to protect the prestressed tendons from corrosion and ensure the complete transfer of prestress. Traditional tensioning relies on manual operation, which is prone to problems such as poor synchronization and insufficient holding time. Secondly, ensuring sufficient flow and filling of grout during the grouting process, and avoiding air bubbles and grout leakage, is a crucial step in ensuring the long-term durability of prestressed tendons.

[0004] Therefore, implementing monitoring and early warning during the prestressing tensioning and grouting of box girders to ensure the accuracy and safety of the prestressing tensioning and grouting process and to avoid quality hazards caused by human operation or equipment failure has become an urgent problem to be solved. Summary of the Invention

[0005] This invention provides an early warning system for prestressed grouting of box girders to solve the technical problem of how to monitor and provide early warning of stress tensioning and grouting of box girders.

[0006] According to this utility model, a prestressed tensioning and grouting early warning system for box girders includes a box girder, a tensioning mechanism, a grouting mechanism, a monitoring module, and an early warning module. The box girder is provided with prestressing tendons and corrugated pipes. The prestressing tendons are embedded in the box girder, and the corrugated pipes are sleeved on the prestressing tendons. The tensioning mechanism includes a jack, a pad, and an anchor plate. The first side of the pad is installed at the opening of the box girder and connected to the corrugated pipe. The anchor plate is installed on the second side of the pad, and the jack is connected to the anchor plate. The grouting mechanism is connected to the box girder for injecting grout into the corrugated pipe. The monitoring module includes a tension pressure sensor, a displacement sensor, and a grouting pressure sensor. The system includes an electromagnetic flow sensor, a tension pressure sensor located inside the jack to measure the internal hydraulic pressure of the jack, a displacement sensor located on the prestressing tendon to detect the deformation of the prestressing tendon, a grout pressure sensor located at the inlet or outlet of the bellows to detect the grout pressure inside the bellows, and an electromagnetic flow sensor located at the inlet or outlet of the bellows to detect the grout flow rate inside the bellows. The early warning module includes a central control terminal and an alarm electrically connected to the central control terminal. The tension pressure sensor, the displacement sensor, the grout pressure sensor, and the electromagnetic flow sensor are all electrically connected to the central control terminal.

[0007] Furthermore, the jacks are arranged in two symmetrical sets, with the two sets of jacks located at both ends of the corrugated pipe.

[0008] Furthermore, the jack includes a hydraulic cylinder, a pump body, and a piston. The pump body is connected to the piston, and the piston is connected to the prestressing tendon and used to tension the prestressing tendon. The hydraulic cylinder has an oil inlet and an oil outlet, both of which are connected to the pump body. The pressure sensor is located at the oil inlet to detect the internal hydraulic pressure of the jack.

[0009] Furthermore, the piston has an installation hole for installing the prestressing tendon, and a tightening bolt is also provided on the piston. The tightening bolt is used to abut against the prestressing tendon to lock the prestressing tendon to the piston.

[0010] Furthermore, a limit stop is provided inside the hydraulic cylinder, the limit stop is adjustable along the movement direction of the piston, and a locking block is provided on the piston, the limit stop abutting against the locking block to adjust the stroke of the piston.

[0011] Furthermore, the grouting mechanism includes a grout storage tank, a grouting pump, and a grouting valve. The grout storage tank is provided with a grouting pipe that communicates with the corrugated pipe. The grouting valve is provided on the grouting pipe, and the grouting pump is provided inside the grout storage tank.

[0012] Furthermore, the pad and the anchor plate are detachably connected by bolts.

[0013] Furthermore, the anchor plate is equipped with an acoustic receiver that is electrically connected to the central control terminal.

[0014] Furthermore, the central control terminal is equipped with a display screen that displays the data acquired by the monitoring module.

[0015] Furthermore, the alarm is a buzzer.

[0016] This invention offers the following advantages: In the prestressed tensioning and grouting early warning system for box girders, a detection module monitors the tension of the prestressing tendons and the amount of grouting within the corrugated pipe in real time. Specifically, different types of sensors collect various information from within the box girder, detecting the prestressing tension and grouting process. Adjustments are made based on the detection results, enhancing construction safety and reliability. Furthermore, the detection of prestressing tension and grouting within the box girder is conducted independently, without interference, facilitating adjustment and maintenance. Specifically, when a tensioning early warning is issued for the prestressing tendons of the box girder, the tendons are tensioned using jacks. At this time, tension pressure sensors and displacement sensors collect the internal hydraulic pressure of the jacks and the deformation of the prestressing tendons, respectively, and transmit the data to the central control terminal. The central control terminal processes and judges the data to determine if the prestressing tendon tension is abnormal. If the data is abnormal, an alarm is triggered. Simultaneously, adjustments to the tensioning process can be made through the central control terminal to meet the tensioning requirements. When grouting warnings are issued for the corrugated pipes of the box girder, the grouting mechanism monitors the grouting pressure and flow rate in the corrugated pipes in real time. Specifically, grouting pressure sensors and electromagnetic flow sensors detect the grout pressure and flow rate values ​​in the corrugated pipes, and the collected information is fed back to the central control terminal. The central control terminal processes the data and judges whether the grout pressure in the corrugated pipe is abnormal. If the data is abnormal, an alarm is triggered. At the same time, the grouting volume of the corrugated pipe can be adjusted through the central control terminal. Therefore, this utility model monitors and issues warnings for the stress tension grouting of the box girder through the cooperation of various sensors and the central control terminal.

[0017] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0019] Figure 1 This is a schematic diagram of the arrangement of the tensioning mechanism and the box girder in a preferred embodiment of this utility model.

[0020] Figure 2 This is a schematic diagram of the arrangement of the grouting mechanism and the box girder in a preferred embodiment of this utility model.

[0021] Figure 3 This is a schematic diagram of the signal transmission of each sensor in the detection module and early warning module of the preferred embodiment of this utility model.

[0022] Legend: 100, Box girder; 101, Prestressed tendon; 102, Corrugated pipe; 200, Jack; 201, Hydraulic cylinder; 202, Pump body; 203, Piston; 204, Clamping block; 205, Tightening bolt; 206, Limiting block; 207, Pad plate; 208, Anchor plate; 209, Oil inlet; 210, Oil outlet; 300, Grouting tank; 301, Grouting pump; 302, Grouting pipe; 303, Grouting valve; 400, Tension pressure sensor; 401, Displacement sensor; 402, Grouting pressure sensor; 403, Electromagnetic flow sensor; 404, Acoustic receiver; 500, Central control terminal; 501, Alarm; 600, Display screen. Detailed Implementation

[0023] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0024] like Figures 1-3As shown, this utility model discloses a prestressed tensioning and grouting early warning system for a box girder 100. The system includes a box girder 100, a tensioning mechanism, a grouting mechanism, a monitoring module, and an early warning module. The box girder 100 is provided with prestressed tendons 101 and corrugated pipes 102. The prestressed tendons 101 are embedded in the box girder 100, and the corrugated pipes 102 are sleeved on the prestressed tendons 101. The tensioning mechanism includes a jack 200, a pad 207, and an anchor plate 208. The first side of the pad 207 is installed at the opening of the box girder 100 and connected to the corrugated pipe 102. The anchor plate 208 is installed on the second side of the pad 207, and the jack 200 is connected to the anchor plate 208. The grouting mechanism is connected to the box girder 100 for injecting grout into the corrugated pipe 102. The monitoring module includes a tension pressure sensor 400, a displacement sensor 401, and a grouting pressure sensor 402. The system includes a force sensor 402 and an electromagnetic flow sensor 403. The tension pressure sensor 400 is installed inside the jack 200 to measure the internal hydraulic pressure of the jack 200. The displacement sensor 401 is installed on the prestressing tendon 101 to detect the deformation of the prestressing tendon 101. The grouting pressure sensor is located at the inlet or outlet of the bellows 102 to detect the grouting pressure inside the bellows 102. The electromagnetic flow sensor 403 is located at the inlet or outlet of the bellows 102 to detect the grout flow rate inside the bellows 102. The early warning module includes a central control terminal 500 and an alarm 501 electrically connected to the central control terminal 500. The tension pressure sensor 400, the displacement sensor 401, the grouting pressure sensor 402, and the electromagnetic flow sensor 403 are all electrically connected to the central control terminal 500.

[0025] In this embodiment, the pad 207 and the anchor plate 208 are detachably connected. The pad 207 and the anchor plate 208 are set so that the jack 200 can directly contact the box girder 100, protecting the box girder 100 and the corrugated pipe 102 and preventing damage to the box girder 100 due to compression during the operation of the jack 200. At the same time, the tension pressure sensor 400, displacement sensor 401, grouting pressure sensor 402 and electromagnetic flow sensor 403 can also be paired with the central control terminal 500 via wireless or Bluetooth signals to transmit detection signals.

[0026] By setting up a detection module, the tension of the prestressing tendons 101 and the amount of grouting in the corrugated pipe 102 are monitored in real time. Specifically, different types of sensors are used to collect different information within the box girder 100, and the prestressing tension and grouting within the box girder 100 are detected. Adjustments are made based on the detection results, which enhances the safety and reliability of construction. In this utility model, the detection of prestressing tension and grouting within the box girder 100 is carried out independently without affecting each other, which facilitates adjustment and maintenance. Specifically, when tensioning warning is issued for the prestressed tendons 101 of the box girder 100, the prestressed tendons 101 are tensioned by the jacks 200. At this time, the tension pressure sensor 400 and the displacement sensor 401 collect the internal hydraulic pressure of the jacks 200 and the deformation of the prestressed tendons 101, respectively, and transmit the data to the central control terminal 500. The central control terminal 500 processes and judges the data to determine whether the tensioning of the prestressed tendons 101 is abnormal. If the data is abnormal, an alarm is triggered by the alarm 501. At the same time, the tensioning process can be adjusted through the central control terminal 500 to meet the tensioning requirements. When the corrugated pipe 102 of the box girder 100 is under grouting warning, the grouting mechanism monitors the grouting pressure and flow rate within the corrugated pipe 102 in real time. Specifically, the grouting pressure sensor 402 and the electromagnetic flow sensor 403 detect the grout pressure and flow rate values ​​of the corrugated pipe 102, respectively, and feed the collected information back to the central control terminal 500. The central control terminal 500 processes and judges the data to determine whether the grout pressure of the corrugated pipe 102 is abnormal. If the data is abnormal, an alarm is triggered by the alarm 501. At the same time, the grouting volume of the corrugated pipe 102 can be adjusted through the central control terminal 500. Therefore, this utility model monitors and provides early warning for the stress tension grouting of the box girder 100 through the cooperation of various sensors and the central control terminal 500.

[0027] Furthermore, two sets of jacks 200 are symmetrically arranged, with each set located at one end of the corrugated pipe 102. In this embodiment, the two sets of jacks 200 allow for simultaneous tensioning of both ends of the prestressing tendon 101. This accelerates the tensioning rate and eliminates the need for single-sided fixing of the untensioned end of the prestressing tendon 101, reducing installation steps and improving tensioning efficiency.

[0028] Furthermore, the jack 200 includes a hydraulic cylinder 201, a pump body 202, and a piston 203. The pump body 202 is connected to the piston 203, and the piston 203 is connected to the prestressing tendon 101 and used to tension the prestressing tendon 101. The hydraulic cylinder 201 has an oil inlet hole 209 and an oil outlet hole 210. Both the oil inlet hole 209 and the oil outlet hole 210 are connected to the pump body 202. The pressure sensor is set at the oil inlet hole 209 to detect the internal hydraulic pressure of the jack 200.

[0029] In this embodiment, during use, the pump body 202 drives the piston 203 to move by adjusting the oil output of the oil inlet 209 and the oil outlet 210. This causes the piston 203 to tension the prestressed tendon 101. The tension pressure sensor 400 and the displacement sensor 401 collect the internal hydraulic pressure of the jack 200 and the deformation of the prestressed tendon 101, respectively, and transmit the data to the central control terminal 500. The central control terminal 500 processes and judges the data to determine whether the tension of the prestressed tendon 101 is abnormal. If the data is abnormal, an alarm is triggered by the alarm 501. At the same time, the tensioning process can be adjusted through the central control terminal 500 to meet the tensioning requirements.

[0030] Furthermore, the piston 203 has mounting holes for installing the prestressing tendon 101, and a tightening bolt 205 is also provided on the piston 203. The tightening bolt 205 is used to abut against the prestressing tendon 101 to lock the prestressing tendon 101 to the piston 203. In this embodiment, the prestressing tendon 101 is locked by the tightening bolt 205, so that the prestressing tendon 101 and the piston 203 can move synchronously, thereby achieving the purpose of tensioning the prestressing tendon 101 by the movement of the piston 203.

[0031] Furthermore, a limit stop 206 is provided inside the hydraulic cylinder 201. The limit stop 206 is adjustable along the moving direction of the piston 203. A locking block 204 is provided on the piston 203. The limit stop 206 abuts against the locking block 204 to adjust the stroke of the piston 203. In this embodiment, the limit stop 206 is provided inside the hydraulic cylinder 201 to regulate the movement stroke of the piston 203, thereby allowing for the anticipated control of the deformation of the prestressed tendon 101.

[0032] Furthermore, the grouting mechanism includes a grout storage tank 300, a grouting pump 301, and a grouting valve 303. The grout storage tank 300 is equipped with a grouting pipe 302 communicating with the corrugated pipe 102. The grouting valve 303 is located on the grouting pipe 302, and the grouting pump 301 is located inside the grout storage tank 300. In this embodiment, the grouting pump 301 outputs the grout, the grouting valve 303 controls the flow rate of the grout, and the grouting pipe 302 injects the grout into the grouting pipe 302 to grout the corrugated pipe 102.

[0033] Furthermore, the pad 207 and the anchor plate 208 are detachably connected by bolts. In this embodiment, the bolt connection is simple to operate and convenient to assemble.

[0034] Furthermore, the anchor plate 208 is equipped with an acoustic receiver 404 electrically connected to the central control terminal 500. In this embodiment, during grouting, the grout enters the corrugated pipe 102 through the grouting pipe 302. When the grouting reaches a certain level, the grout enters the corrugated pipe 102 and forms a prestressed pipe with the prestressing tendons 101. By striking different positions of the prestressed pipe, the acoustic receiver 404 receives shock waves at different times and transmits the acoustic data to the central control terminal 500. The central control terminal 500 calculates and judges the density of the grouting in the box girder 100. When the density is insufficient, the central control terminal 500 controls the grouting pump 301 to output grout through the grouting pipe 302 into the box girder 100 for filling.

[0035] Furthermore, the central control terminal 500 is equipped with a display screen 600 that displays the data acquired by the monitoring module. In this embodiment, the display screen 600 can analyze and display the data from each sensor, so that operators can directly obtain information and control the system in real time.

[0036] Furthermore, the alarm 501 is a buzzer. In this embodiment, the buzzer can directly sound an alarm when data is abnormal, prompting the operator to handle the situation promptly.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A box girder prestress tensioning and grouting early warning system, characterized in that, include: A box girder (100) is provided with prestressed tendons (101) and corrugated pipes (102). The prestressed tendons (101) are embedded in the box girder (100), and the corrugated pipes (102) are sleeved on the prestressed tendons (101). The tensioning mechanism includes a jack (200), a pad plate (207), and an anchor plate (208). The first side of the pad plate (207) is installed at the opening of the box girder (100) and connected to the corrugated pipe (102). The anchor plate (208) is installed on the second side of the pad plate (207). The jack (200) is connected to the anchor plate (208). A grouting mechanism, which is connected to the box girder (100) for injecting grout into the corrugated pipe (102); The monitoring module includes a tension pressure sensor (400), a displacement sensor (401), a grouting pressure sensor (402), and an electromagnetic flow sensor (403). The tension pressure sensor (400) is installed inside the jack (200) to measure the internal hydraulic pressure of the jack (200). The displacement sensor (401) is installed on the prestressing tendon (101) to detect the deformation of the prestressing tendon (101). The grouting pressure sensor is located at the inlet or outlet of the bellows (102) to detect the grouting pressure inside the bellows (102). The electromagnetic flow sensor (403) is located at the inlet or outlet of the bellows (102) to detect the flow rate of the grout inside the bellows (102). The early warning module includes a central control terminal (500) and an alarm (501) electrically connected to the central control terminal (500). The tension pressure sensor (400), the displacement sensor (401), the grouting pressure sensor (402), and the electromagnetic flow sensor (403) are all electrically connected to the central control terminal (500).

2. The box girder prestress tension and grouting early warning system according to claim 1, characterized in that, The jacks (200) are arranged in two symmetrical sets, and the two sets of jacks (200) are located at both ends of the corrugated pipe (102).

3. The box girder prestressed tensioning and grouting early warning system according to claim 2, characterized in that, The jack (200) includes a hydraulic cylinder (201), a pump body (202), and a piston (203). The pump body (202) is connected to the piston (203), and the piston (203) is connected to the prestressing tendon (101) and used to tension the prestressing tendon (101). The hydraulic cylinder (201) has an oil inlet (209) and an oil outlet (210), both of which are connected to the pump body (202). The pressure sensor is located at the oil inlet (209) to detect the internal hydraulic pressure of the jack (200).

4. The box girder prestressed tensioning and grouting early warning system according to claim 3, characterized in that, The piston (203) has an installation hole for installing the prestressing tendon (101), and the piston (203) is also provided with a tightening bolt (205), which is used to abut against the prestressing tendon (101) to lock the prestressing tendon (101) with the piston (203).

5. The box girder prestress tension and grouting early warning system according to claim 4, characterized in that, The hydraulic cylinder (201) is provided with a limit stop (206), which is adjustable along the moving direction of the piston (203). The piston (203) is provided with a locking block (204), and the limit stop (206) abuts against the locking block (204) to adjust the stroke of the piston (203).

6. The box girder prestress tension and grouting early warning system according to claim 1, characterized in that, The grouting mechanism includes a grout storage tank (300), a grouting pump (301), and a grouting valve (303). The grout storage tank (300) is provided with a grouting pipe (302) that communicates with the corrugated pipe (102). The grouting valve (303) is provided on the grouting pipe (302), and the grouting pump (301) is provided inside the grout storage tank (300).

7. The box girder prestress tension and grouting early warning system according to claim 1, characterized in that, The pad (207) and the anchor plate (208) are detachably connected by bolts.

8. The pre-stress tension and grouting early warning system for a box girder according to any one of claims 1-7, characterized in that, An acoustic receiver (404) electrically connected to the central control terminal (500) is provided on the anchor plate (208).

9. The pre-stress tension and grouting early warning system for a box girder according to any one of claims 1-7, characterized in that, The central control terminal (500) is equipped with a display screen (600) that displays the data acquired by the monitoring module.

10. The pre-stress tension and grouting early warning system for a box girder according to any one of claims 1-7, characterized in that, The alarm (501) is a buzzer.

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