Temporary tension monitoring device for splicing stage of section glue splicing beam

Abstract

The utility model discloses a temporary stretch-draw monitoring device in the splicing stage of a segmental glue splicing beam, which comprises a monitoring device and a segmental beam, a sleeve is pre-buried in the segmental beam, a temporary prestress pedestal is arranged on the sleeve, the temporary prestress pedestal can be recycled, and the waste of construction resources is reduced. A parallel steel wire rope is arranged between the temporary prestress pedestals between the two segmental beams in a penetrating mode, and an anchor cable meter is arranged at one end of the parallel steel wire rope. And a displacement-strain monitoring system is arranged at a cross joint between the segmental beams and is used for monitoring whether a glue joint is cracked or not in real time. And the monitoring equipment is connected with the anchor cable meter and the displacement-strain monitoring system. The device is simple in structure, and the temporary prestress change is monitored in real time by using the anchor cable meter. The displacement-strain monitoring system is arranged at the glue joint to monitor whether the glue joint cracks or not, the safety of constructors is guaranteed, the needed construction space is small, the construction difficulty is reduced, and good popularization value is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of segmental girder glued-together construction, in particular to a temporary tensioning monitoring device during the segmental girder glued-together beam assembly stage. Background Art

[0002] Segmental prefabrication and glued-together construction is a highly efficient and commonly used method in modern bridge engineering. Beams are prefabricated in segments at a beam yard, then transported to a bridge-erecting machine for assembly. The segments are then bonded together with epoxy resin glue to form a complete bridge. Temporary prestressing is a crucial component of this assembly phase. This ensures a tight connection between adjacent segments during assembly, preventing misalignment. It also creates compressive stress in the glued-together joints, ensuring the epoxy resin glue applied to the joints reaches its maximum strength.

[0003] Currently, PSB830 coarse prestressed steel bars are commonly used to apply temporary prestressing during the segmental beam assembly phase, with tensioning and anchoring extending along the entire length of the bridge span. However, the temporary prestressing strength is not monitored in real time during the assembly phase. If the temporary prestressing relaxes or fails, it can lead to cracking and leakage in the adhesive joints, or even bridge collapse, compromising the safety of construction workers. Furthermore, if the adhesive joints are not tightly connected during the assembly phase, water can enter the permanent prestressing pipes through the adhesive joints, accelerating the corrosion of the permanent prestressing steel strands and posing a significant risk to the long-term operation of the bridge.

[0004] During the segment gluing stage, there is a lack of real-time monitoring of the size of temporary prestressing and whether the glue joints are cracking. It is impossible to guarantee the linear accuracy of construction, the degree of curing of epoxy resin glue and construction safety in real time. It is also impossible to guarantee whether the glue joints are leaking during subsequent use, which poses a huge hidden danger to the long-term use of permanent prestressed steel strands. Utility Model Content

[0005] The purpose of the utility model is to provide a temporary tensioning monitoring device for the assembly stage of segmental glued beams, which solves the technical problems of being unable to monitor the size of temporary prestressing and ensuring construction safety during the prefabrication stage of segmental beams, and solving the technical problems of monitoring whether glue joints are cracked during the prefabrication stage of segmental beams.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A temporary tension monitoring device for the assembly of segmental glued-jointed beams comprises monitoring equipment and segmental beams. The segmental beams are pre-embedded with sleeves equipped with temporary prestressing pedestals. These reusable pedestals reduce waste of construction resources. Parallel steel cables are threaded between the temporary prestressing pedestals between two segmental beams, each with an anchor cable gauge at one end.

[0008] A displacement-strain monitoring system is provided at the spans between the segment beams to monitor in real time whether the adhesive joints are cracking. The monitoring equipment is connected to the anchor cable meter and the displacement-strain monitoring system.

[0009] In a specific embodiment, the displacement-strain monitoring system includes a displacement sensor and a strain sensor for monitoring the temporary prestressing and the degree of cracking of the adhesive joints during the assembly process.

[0010] In a specific embodiment, a rubber leveling plate is provided between the temporary prestressed pedestal and the upper surface of the segmental beam.

[0011] In a specific embodiment, the temporary prestressed pedestal includes a base plate, one surface of which is provided with two parallel longitudinal ribs, anchor pads are provided at both ends of the longitudinal ribs, and a cable hole for passing parallel steel cables is opened in the middle of the anchor pad to facilitate the passage of parallel steel cables.

[0012] In a specific embodiment, a chill-cast anchor for anchoring parallel steel cables is provided on one side of one of the anchor plates.

[0013] In a specific embodiment, the temporary prestressed base and the sleeve are detachably connected, so that the temporary prestressed base can be recycled and waste of construction resources can be reduced.

[0014] In a specific embodiment, two displacement sensors and three strain sensors are provided at the spans between the segment beams.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This new type of anchor has a simple structure, is easy to construct, and has strong applicability and versatility. Temporary prestressed pedestals are staggered and anchored on the top surface of the segmental beam. The two segments are assembled using parallel steel cables, temporary prestressed pedestals, and cold-cast anchors. An anchor meter is installed at one end of the parallel steel cables to monitor changes in the temporary prestress in real time.

[0017] This new design incorporates a displacement-strain monitoring system at the adhesive joints to monitor cracking and ensure the safety of construction workers. The temporary prestressed pedestal ensures levelness between the pedestal and the segmental beam, ensuring the segmental beam and pedestal are integrated. This prevents significant deformation of the pedestal when tensioning the parallel steel cables. The pedestal is removable and reusable, minimizing waste of construction resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of a temporary prestressed pedestal in an embodiment of the present utility model.

[0020] As shown in the figure:

[0021] 1. Segmental beam, 2. Sleeve, 3. Temporary prestressed pedestal, 4. Parallel steel wire rope, 5. Anchor cable meter, 6. Displacement sensor, 7. Strain sensor, 8. Rubber leveling plate, 9. Bottom plate, 10. Bolt, 11. Longitudinal rib, 12. Anchor pad, 13. Cable hole, 14. Cold cast anchor, 15. Monitoring equipment. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-Figure 2 A temporary tension monitoring device for the assembly stage of a segmental glued beam comprises a monitoring device 15 and a segmental beam 1. A sleeve 2 is pre-embedded on each segmental beam 1, and a temporary prestressed pedestal 3 is provided on the sleeve 2. Parallel steel cables 4 are passed through the temporary prestressed pedestals 3 between two segmental beams 1, and an anchor cable meter 5 is provided at one end of the parallel steel cables 4.

[0024] A displacement-strain monitoring system is provided at the spans between the segment beams 1 for real-time monitoring of whether the adhesive joints are cracking. Once the tensile strain and longitudinal displacement are found to exceed the alarm value, the work is stopped immediately to ensure the safety of the construction workers.

[0025] In a specific embodiment, a plurality of sleeves 2 are pre-embedded on each segmental beam 1, and the temporary prestressed pedestal 3 is detachably connected to the sleeve 2 by bolts 10. The temporary prestressed pedestal 3 can be recycled, reducing the waste of construction resources. A rubber adjustment plate 8 is sleeved on the bolt 10, and the rubber adjustment plate 8 is located on the upper surface of the segmental beam 1. After the temporary prestressed pedestal 3 is installed, the rubber adjustment plate 8 is located between the temporary prestressed pedestal 3 and the upper surface of the segmental beam 1. The rubber adjustment plate 8 adjusts the installation flatness between the temporary prestressed pedestal 3 and the segmental beam 1 to a certain extent, so that the contact between the temporary prestressed pedestal 3 and the segmental beam 1 is smoother.

[0026] The temporary prestressed pedestal 3 includes a base plate 9, and two parallel longitudinal ribs 11 with a certain gap are welded to the upper surface of the base plate 9. Anchor pads 12 are welded at both ends of the longitudinal ribs 11. The anchor pads 12 at both ends of the longitudinal ribs 11 are parallel to each other, so that the longitudinal ribs 11 and the anchor pads 12 are perpendicular to each other, forming a box-type structure with high rigidity, which prevents the temporary prestressed pedestal 3 from undergoing large deformation. The anchor pads 12 are used for tensioning and anchoring parallel steel wires, and a through hole 13 for the parallel steel wires 4 is opened in the middle to facilitate the passage of the parallel steel wires 4. A mounting hole is provided on the base plate 9, and the sleeve 2 is inserted into the mounting hole and fixed with bolts 10, so that the temporary prestressed pedestal 3 is installed on the upper surface of the segment beam 1.

[0027] The parallel steel cables 4 are threaded through the cable holes 13 on the anchor pad 12. One end is connected to the anchor cable meter 5 for real-time monitoring of the temporary prestressing force. If the temporary prestressing force loss exceeds the alarm value, the prestressing force is immediately increased. The other end is anchored by a cold cast anchor 14.

[0028] The displacement-strain monitoring system includes two displacement sensors 6 and three strain sensors 7 embedded in the seams between the segmental beams 1. The monitoring equipment is connected to the anchor meter 5, displacement sensors 6, and strain sensors 7, ensuring that the temporary prestressing and cracking of the adhesive joints are within control throughout the assembly process, ensuring construction safety and assembly accuracy. The monitoring device 15 is a computer or PLC controller that collects data from the anchor meter 5, displacement sensors 6, and strain sensors 7, analyzes it on the computer, and monitors changes in the temporary prestressing in real time.

[0029] The method of using this device is as follows:

[0030] First, during the prefabrication stage of the segmental beam 1, the sleeves 2 need to be staggered and arranged on the top or side of the beam to ensure that they can be anchored together with the temporary prestressed pedestal 3 during assembly. The temporary prestressed pedestal 3 requires the bottom plate 9, longitudinal ribs 11 and anchor pads 12 to be welded together in the factory.

[0031] Then, during assembly of the segmental beam 1, the temporary prestressing pedestal 3 is anchored to the sleeve 2 on the segmental beam 1 via bolts 10. After the parallel steel cables 4 are threaded through the cable holes 13 on the temporary prestressing pedestal 3, the anchor cable gauge 5 is installed and tensioned. After tensioning, the cables are anchored to the steel backing plate using a cold-cast anchor 14. A displacement-strain monitoring system is installed at the adhesive joints of the segmental beam 1. Three strain sensors and two displacement sensors are placed across the joints to monitor for cracking. These measures ensure the normal construction of the existing bridge and ensure construction safety.

Claims

1. A temporary tension monitoring device for the assembly stage of a segmental glued beam, comprising a monitoring device (15) and a segmental beam (1), wherein the segmental beam (1) is pre-embedded with a sleeve (2), and is characterized in that: A temporary prestressed pedestal (3) is provided on the sleeve (2), and a parallel steel wire (4) is passed through the temporary prestressed pedestal (3) between the two segmental beams (1), and an anchor cable gauge (5) is provided at one end of the parallel steel wire (4); A displacement-strain monitoring system is provided at the spans between the segment beams (1), and the monitoring device (15) is connected to the anchor cable meter (5) and the displacement-strain monitoring system.

2. A temporary tension monitoring device for segmental glued beam assembly according to claim 1, characterized in that: The displacement-strain monitoring system comprises a displacement sensor (6) and a strain sensor (7).

3. The temporary tension monitoring device for the assembly stage of segmental glued beams according to claim 1, characterized in that: A rubber leveling plate (8) is provided between the temporary prestressed pedestal (3) and the upper surface of the segment beam (1).

4. The temporary tension monitoring device for the assembly stage of segmental glued beams according to claim 1, characterized in that: The temporary prestressed pedestal (3) comprises a bottom plate (9), one surface of the bottom plate (9) is provided with two parallel longitudinal ribs (11), both ends of the longitudinal ribs (11) are provided with anchor pads (12), and the middle of the anchor pads (12) is provided with a cable hole (13) for passing the parallel steel wire rope (4).

5. A temporary tension monitoring device for segmental glued beam assembly according to claim 4, characterized in that: One side of one of the anchor pads (12) is provided with a cold cast anchor (14) for anchoring the parallel steel wire ropes (4).

6. The temporary tension monitoring device for the assembly stage of segmental glued beams according to claim 1, characterized in that: The temporary prestressed pedestal (3) and the sleeve (2) are detachably connected.

7. The temporary tension monitoring device for the assembly stage of segmental glued beams according to claim 2, characterized in that: Two displacement sensors (6) and three strain sensors (7) are provided at the spans between the segment beams (1).

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