Bridge cantilever construction hanging basket with load monitoring device

Abstract

The utility model provides a kind of bridge cantilever method construction hanging basket of setting load monitoring device, including the track of longitudinal extension being set on the beam segment that has been poured, prismatic truss being connected on track and the sling being set in the one end of prismatic truss, prismatic truss passes several anchor rods and is fixed on the beam segment that has been poured;It further includes the horizontal compression beam that is pressed on the edge of prismatic truss, anchor rod has two, the upper end of anchor rod is connected together after passing through horizontal compression beam with lock nut, load monitoring device is equipped between lock nut and horizontal compression beam, the load monitoring device includes pressure sensor and the alarm device that is connected together with the output electric wire of pressure sensor, pressure sensor is clamped between horizontal compression beam and lock nut, and the pressure that pressure sensor detects corresponds to the maximum allowable amount of the load of sling when the alarm device alarms.The utility model has the advantages of being able to conveniently implement engineering, solves the problem that existing hanging basket cannot monitor load.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a cantilever construction formwork for bridges equipped with a load monitoring device. Background Technology

[0002] The cantilever method has been widely used in long-span prestressed concrete bridges, and the mobile hanging basket is the main construction equipment for the cantilever method. The structure of existing hanging baskets is shown below. Figure 2 As shown, the structure includes a longitudinally extending track 2 set on the already cast beam segment 1, a prismatic truss 3 resting on the track with its edge parallel to the track in the longitudinal direction, and a sling 4 set at one end of the prismatic truss. The end of the prismatic truss connected to the sling is suspended above the position of the beam segment to be cast. The sling is used to suspend the formwork 5 for casting the beam segment. The end of the prismatic truss away from the sling is fixed to the already cast beam segment by several anchor rods 6 (usually two). Figure 2 As can be seen, the rhomboid truss is the main load-bearing structure. Most of the weight of the formwork, reinforcing mesh, concrete, and construction loads are transferred to the front end of the rhomboid truss via slings, while the reaction force provided by the rear anchor (anchor bolt) acts on the rear end of the rhomboid truss, maintaining a balance between the two. To ensure the rhomboid truss is in a safe working state, it is necessary to monitor the load on the front end. However, the numerous slings and other auxiliary suspension components at the front end create a congested space, and the fact that the front end is suspended makes it difficult to install monitoring sensors. Therefore, it is necessary to develop an easily implementable bridge cantilever construction formwork with load monitoring devices. Utility Model Content

[0003] The present invention aims to provide a cantilever construction formwork for bridges equipped with a load monitoring device, which can be conveniently implemented in engineering projects, and solves the problem that existing formwork cannot monitor loads.

[0004] The above-mentioned technologies are solved by the following technical solution: a bridge cantilever construction formwork with a load monitoring device, comprising a longitudinally extending track set on a cast-in-place beam segment, a prismatic truss with its edge parallel to the track in the length direction resting on the track, and a sling set at one end of the prismatic truss. The end of the prismatic truss connected to the sling is suspended above the position of the beam segment to be cast. The sling is used to suspend the formwork for casting the beam segment. The end of the prismatic truss away from the sling is fixed to the cast-in-place beam segment by several anchor rods. The feature is that it also includes a transverse pressure beam pressing on the edge of the prismatic truss placed flat on the track. There are two anchor rods. The upper ends of the two anchor rods pass through the transverse pressure beam and are connected to a locking nut. A load monitoring device is provided between the locking nut and the transverse pressure beam to detect whether the load of the sling reaches the maximum allowable amount. The load monitoring device includes a pressure sensor and an alarm device connected to the output wire of the pressure sensor. The pressure sensor is clamped between the transverse pressure beam and the locking nut. When the pressure detected by the pressure sensor corresponds to the maximum allowable load of the sling, the alarm device sounds an alarm. It can easily enable the installation of load monitoring devices to monitor the stress on the hanging basket.

[0005] Preferably, the pressure sensor has a connecting through hole, and the anchor rod passes through the connecting through hole. This ensures reliable fixation of the pressure sensor.

[0006] Preferably, the pressure sensor has a lower support block at its lower end and an upper support block at its upper end. The lower support block includes a lower half and an upper half, which are spherically fitted together. The upper support block also includes a lower half and an upper half, which are spherically fitted together. This design allows for slight rotation between the two halves of the upper and lower support blocks, ensuring that the pressure sensor is only subjected to pressure along its axial direction, thereby improving measurement accuracy.

[0007] Preferably, the pressure sensor is covered with a protective cover, which includes lead wire holes and heat dissipation holes. This provides protection for the pressure sensor and also ensures good heat dissipation.

[0008] Preferably, the protective cover is connected to the horizontal pressure beam via a limiting screw, and a movable gap is provided between the protective cover and the horizontal pressure beam. This avoids interference between the protective cover and the measurement accuracy.

[0009] Preferably, the alarm device has a light-transmitting housing, and the alarm device itself is an alarm light. This provides protection for the alarm device.

[0010] Preferably, the alarm light emits red light, which has good penetrating power.

[0011] Preferably, the pressure sensor is covered with a protective cover, the protective cover having heat dissipation holes, and the outer shell is fixed to the protective cover. This results in a compact structure.

[0012] Preferably, the outer casing includes a horizontally extending tube, one end of which is sealed and fixed together with the protective cover, and the other end is detachably connected to an end cap, with the heat dissipation holes aligned with the tube.

[0013] Preferably, the end cap includes a cover plate and outward flanges disposed at the upper and lower ends of the cover plate. The outward flanges overlap the upper and lower surfaces of the tube body, and the end cap fixing screws pass through the outward flanges and are threaded onto the tube body.

[0014] Beneficial effects: 1. By utilizing the relationship that the reaction force F of the rear anchor is equal to the load P at the front end of the rhomboid truss, the load P can be obtained by measuring the reaction force F, which facilitates the installation and measurement of sensor 1.

[0015] 2. The monitoring device has an alarm function. By setting alarm values ​​appropriately, risks can be predicted earlier, which is beneficial to safe production.

[0016] 3. The sensors are manufactured in-house, ensuring quality and eliminating the need for on-site application of strain gauges and other sensors. This improves the accuracy of the measured reaction force F and enables real-time monitoring of the load on the hanging basket, providing an alarm when the load is reached, thus preventing accidents caused by overload. Attached Figure Description

[0017] Figure 1 This is a schematic cross-section of the present invention; Figure 2 A schematic diagram of an existing hanging basket. Figure 3 This is a schematic diagram of the load monitoring device; Figure 4 This is a schematic diagram of the forces acting on a rhomboid truss.

[0018] In the diagram: 1. Cast-in-place beam segment; 2. Track; 3. Prism truss; 4. Lifting strap; 5. Formwork; 6. Anchor bolt; 7. Prism truss edge placed flat on the track; 8. Horizontal pressure beam; 9. Locking nut; 10. Load monitoring device; 11. Pressure sensor; 22. Output wire of pressure sensor; 12. Alarm device; 13. Connecting through hole; 14. Upper pad; 15. Lower pad; 31. Lower half of upper pad; 16. Upper half of upper pad; 17. Lower half of lower pad; 18. Lower pad; 19. Protective cover; 20. Lead wire hole; 21. Heat dissipation hole; 23. Limiting screw; 24. Movement gap; 25. Outer shell; 26. Pipe body; 27. End cap; 28. Cover plate; 29. ​​Outer flange; 30. End cap fixing screw. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] See Figures 1 to 4 A cantilever construction formwork for bridges equipped with a load monitoring device includes a longitudinally extending track 2 set on a pre-cast beam segment 1, a prismatic truss 3 resting on the track with its edge parallel to the track in the length direction, and a sling 4 set at one end of the prismatic truss. The end of the prismatic truss connected to the sling is suspended above the position of the beam segment to be cast. The sling is used to suspend the formwork 5 for casting the beam segment. The end of the prismatic truss away from the sling is fixed to the pre-cast beam by several anchor rods 6 (usually two). It also includes a transverse pressure beam 8 pressing on the edge 7 of the prismatic truss placed horizontally on the track. The upper ends of the two anchor rods pass through the transverse pressure beam and are connected to locking nuts 9. The lower ends of the anchor rods are fixed to the pre-cast beam segment. A load monitoring device 10 is provided between the locking nuts and the transverse pressure beam to detect whether the load on the sling has reached the maximum allowable amount. The load monitoring device includes a pressure sensor 11 and an alarm device 12 connected to the output wire 22 of the pressure sensor. The pressure sensor is clamped between a cross beam and a locking nut. The alarm device sounds when the pressure detected by the pressure sensor corresponds to the maximum allowable load of the sling. The pressure sensor has a connecting through hole 13, through which the anchor rod passes. An upper pad 14 is pressed against the upper end of the pressure sensor, and a lower pad 311 is supported at the lower end. The upper pad includes a lower half 15 and an upper half 16, which are spherically fitted together. The lower pad includes a lower half 17 and an upper half 18, which are also spherically fitted together. The pressure sensor is covered by a protective cover 19, which has a lead wire hole 20 and a heat dissipation hole 21. The protective cover is connected to the horizontal pressure beam via a limiting screw 23, and a movable gap 24 is provided between the protective cover and the horizontal pressure beam. The alarm device has a light-transmitting housing 25, and the alarm device is an alarm light. The alarm light emits red light. The housing includes a horizontally extending tube 26, one end of which is sealed and fixed to the protective cover, and the other end is detachably connected to an end cap 27, with heat dissipation holes aligned with the tube. The end cap includes a cover plate 28 and outward flanges 29 located at the upper and lower ends of the cover plate. The outward flanges overlap the upper and lower surfaces of the tube, and the end cap fixing screws 30 pass through the outward flanges and are threaded onto the tube.

[0021] See Figure 4 The load on the front end of the rhomboid truss P and rear anchor reaction forceF Maintaining a balance between them, that is: For a general rhomboid truss, a=b, then P=F Therefore, as long as the reaction force of the rear anchor is measured... F This allows us to determine the load on the front end of the rhomboid truss. P .

[0022] Loads borne by the rhombus truss P Maximum value divided by safety factor k The allowable load was then obtained. P ], When the measured reaction force F Reaching the allowable reaction force P You can then call the police.

[0023] In this embodiment, the pressure on the rear end of the rhomboid truss is equal to the sum of the forces measured by the two sensors, so the force detected by a single sensor is [ P This will trigger an alarm.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cantilever construction formwork for bridges equipped with a load monitoring device, comprising a longitudinally extending track set on a pre-cast beam segment, a prismatic truss resting on the track with its ribs parallel to the track in the length direction, and a sling set at one end of the prismatic truss, wherein the end of the prismatic truss connected to the sling is suspended above the position of the beam segment to be cast, the sling is used to suspend the formwork for casting the beam segment, and the end of the prismatic truss away from the sling is fixed to the pre-cast beam segment by a plurality of anchor rods, characterized in that... It also includes a transverse pressure beam pressing on the edge of a prismatic truss placed flat on the track. There are two anchor rods, and the upper ends of the two anchor rods pass through the transverse pressure beam and are connected to a locking nut. A load monitoring device is provided between the locking nut and the transverse pressure beam to detect whether the load of the sling has reached the maximum allowable amount. The load monitoring device includes a pressure sensor and an alarm device connected to the output wire of the pressure sensor. The pressure sensor is clamped between the transverse pressure beam and the locking nut. When the pressure detected by the pressure sensor corresponds to the maximum allowable load of the sling, the alarm device sounds an alarm.

2. The cantilever construction formwork for bridges equipped with a load monitoring device according to claim 1, characterized in that, The pressure sensor has a connecting through hole, and the anchor rod passes through the connecting through hole.

3. A cantilever construction formwork for bridges equipped with a load monitoring device according to claim 1 or 2, characterized in that, The pressure sensor has a lower support block at its lower end and an upper support block at its upper end. The lower support block includes a lower half and an upper half of the lower support block portion, which are spherically fitted together. The upper support block includes a lower half and an upper half of the upper support block portion, which are spherically fitted together.

4. A cantilever construction formwork for bridges equipped with a load monitoring device as described in claim 3, characterized in that, The pressure sensor is covered with a protective cover, which has lead wire holes and heat dissipation holes.

5. A cantilever construction formwork for bridges equipped with a load monitoring device according to claim 4, characterized in that, The protective cover is connected to the horizontal pressure beam by a limiting screw, and there is an movable gap between the protective cover and the horizontal pressure beam.

6. A cantilever construction formwork for bridges equipped with a load monitoring device according to claim 1 or 2, characterized in that, The alarm device has a light-transmitting housing and is an alarm light.

7. A cantilever construction formwork for bridges equipped with a load monitoring device according to claim 6, characterized in that, The alarm light emits a red light.

8. A bridge cantilever construction formwork with a load monitoring device as described in claim 6, characterized in that, The pressure sensor is covered with a protective cover, which has heat dissipation holes, and the outer shell is fixed together with the protective cover.

9. A bridge cantilever construction formwork with a load monitoring device as described in claim 8, characterized in that, The outer casing includes a horizontally extending tube, one end of which is sealed and fixed to the protective cover, and the other end is detachably connected to an end cap. The heat dissipation holes are aligned with the tube.

10. A cantilever construction formwork for bridges equipped with a load monitoring device according to claim 9, characterized in that, The end cap includes a cover plate and outward flanges at the upper and lower ends of the cover plate. The outward flanges overlap the upper and lower surfaces of the tube body, and the end cap fixing screws pass through the outward flanges and are threaded onto the tube body.

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