Intelligent two-force lever force measuring device and construction method thereof

Abstract

The utility model relates to two force bars monitoring technical field, and relates to a kind of intelligent two force bars force measuring device and its construction method, including force measuring rod and damping spring, force measuring rod is the same size as the outer diameter size of two force bars hollow steel tube, force measuring rod anchoring end is provided with outer thread, force measuring rod connecting end is provided with outer thread and internal thread, damping spring is sleeved in the middle part of force measuring rod, damping spring both ends are connected with spring cap respectively, and spring cap is connected with the outer thread of hollow steel tube both ends;Force measuring rod is provided with optical fiber through hole along its axial symmetry, and the optical fiber through hole end of force measuring rod anchoring end is provided with optical fiber leading-out hole I, and the spring cap installed on force measuring rod anchoring end is correspondingly provided with optical fiber leading-out hole II, and optical fiber grating sensor is pasted in optical fiber through hole;The utility model can monitor the stress condition of two force bars in real time through optical fiber grating sensor, and timely handle failure rod piece, avoid engineering accident serious, and damping spring has buffering function, effectively avoid engineering accident, and the utility model has low cost, and economic benefit is remarkable.

Description

Technical Field

[0001] This invention relates to the field of two-force bar monitoring technology, specifically to an intelligent two-force bar force measuring device and its construction method. Background Technology

[0002] Two-force members are axially oriented and can be classified as tension or compression members. They are widely used in steel trusses for stadiums, large grandstands, and most steel structures. In steel truss structures, two-force members primarily utilize hollow circular steel tubes and play a crucial role in the load-bearing system. The failure of a single two-force member in an engineering project can easily lead to excessive stress on adjacent members, ultimately causing their failure. Therefore, monitoring the stress on two-force members is essential in engineering projects, but currently, there is no satisfactory solution. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an intelligent two-force bar force measuring device and its construction method, so as to solve the problem that the existing technology cannot monitor the force of the two-force bar in real time, which leads to serious engineering accidents.

[0004] The technical solution to the above technical problem is: an intelligent two-force bar force measuring device, including a force measuring rod and a damping spring. The force measuring rod is a hollow steel tube with an inner diameter the same as the outer diameter of the two-force bar. The anchoring end of the force measuring rod has an external thread, and the connecting end of the force measuring rod has both an external thread and an internal thread. The damping spring is sleeved in the middle of the force measuring rod, and both ends of the damping spring are connected to spring caps. The spring caps are screwed to the external threads at both ends of the hollow steel tube.

[0005] The force measuring rod has symmetrical fiber optic through holes along its axis. The fiber optic through hole at the anchoring end of the force measuring rod has a fiber optic lead-out hole I. The fiber optic lead-out hole I and the end of the fiber optic through hole are connected by a rounded transition. The spring cap installed at the anchoring end of the force measuring rod has a corresponding fiber optic lead-out hole II. A fiber optic grating sensor is attached to the fiber optic through hole.

[0006] A further technical solution of the present invention is that the strength of the force measuring rod and the strength of the damping spring are both greater than or equal to the strength of the two-force rod.

[0007] A further technical solution of the present invention is that the optical fiber exit hole I and the optical fiber exit hole II are circular holes.

[0008] A further technical solution of the present invention is: the end of the force measuring rod connection is symmetrically provided with connecting ears, and the connecting ears are provided with screw holes.

[0009] A further technical solution of the present invention is that the damping spring is a steel structure, and the surfaces of the force measuring rod and the damping spring are both galvanized.

[0010] Another technical solution of the present invention is: a construction method for an intelligent two-force bar force measuring device, comprising the following steps:

[0011] a. Material selection: Determine the inner diameter of the force measuring rod based on the outer diameter of the two-force rod, and ensure that the inner diameter of the force measuring rod is the same as the outer diameter of the two-force rod; Select steel material to make the force measuring rod and the damping spring, and ensure that the strength of the force measuring rod and the strength of the damping spring are both greater than or equal to the strength of the two-force rod;

[0012] b. Prefabricated force measuring rod, with prefabricated external threads at the anchoring end of the force measuring rod and prefabricated external and internal threads at the connecting end of the force measuring rod;

[0013] c. Prefabricated vibration damping springs and spring caps, with the spring caps installed at the anchoring end of the force measuring rod having a reserved optical fiber lead-out hole II;

[0014] d. Opening holes: Optical fiber through holes are symmetrically opened along the axis of the force measuring rod. Optical fiber lead-out hole I is reserved at the end of the optical fiber through hole at the anchoring end of the force measuring rod. Optical fiber lead-out hole I is connected to the end of the optical fiber through hole by a rounded transition.

[0015] e. Attach the fiber Bragg grating sensor. Attach the fiber Bragg grating sensor inside the fiber optic through-hole, and lead the fiber out from fiber optic exit hole I.

[0016] f. Assembly: First, fix the spring cap at one end of the force measuring rod to the force measuring rod, then put the vibration damping spring into the force measuring rod, and finally fix the spring cap at the other end of the force measuring rod. Weld the spring cap to the vibration damping spring, and at the same time lead the optical fiber out from the optical fiber lead-out hole II.

[0017] g. Connection: Anchor the force measuring rod at the anchoring end using the anchoring plate. Connect the two force rod and the force measuring rod together by engaging the internal thread at the connecting end of the two force rod and the force measuring rod. Connect the fiber optic grating sensor to the controller.

[0018] A further technical solution of the present invention is: when performing step f, a certain preload or pretension is applied to the damping spring so that the damping spring is in a compressed or tensile state.

[0019] A further technical solution of the present invention is as follows: In step b, symmetrically arranged connecting ears are prefabricated at the end of the force measuring rod connection, and screw holes are opened on the connecting ears; in step g, the screw is inserted into the screw hole, and then the screw is fixed with a nut, further connecting the force measuring rod and the two-force rod.

[0020] A further technical solution of the present invention is: when performing step a, the thickness of the force measuring rod is determined according to the thickness of the two-force rod, and the thickness of the force measuring rod is the same as the thickness of the two-force rod.

[0021] A further technical solution of the present invention is: during step d, two optical fiber through holes are symmetrically opened along the axial direction of the force measuring rod.

[0022] Due to the above-described structure, the intelligent two-force bar force measuring device of the present invention has the following advantages compared with the prior art:

[0023] 1. Real-time monitoring

[0024] This invention uses a fiber optic grating sensor to monitor the stress on a two-force member in real time, analyze the safety of the member, and promptly address any failed members to prevent the escalation of engineering accidents.

[0025] 2. High sensitivity

[0026] The force measuring rod of the present invention has optical fiber through holes symmetrically opened along its axial direction. After the fiber optic grating sensor is attached to the optical fiber through hole, the strain of the optical fiber is consistent with the strain of the force measuring rod. The strain of the force measuring rod can be measured by using the strain of the optical fiber, and then the strain of the entire two-force rod can be measured.

[0027] Furthermore, both fiber optic exit hole I and fiber optic exit hole II are circular holes. Fiber optic exit hole I is connected to the end of the fiber optic through hole with a rounded transition, which can prevent the fiber from being led out at a large angle and prevent fiber breakage during lead-out.

[0028] 3. Good security

[0029] The force measuring rod of this invention is provided with a vibration damping spring in the middle, which provides sufficient safety reserve for the two force rods. If the two force rods fail, the vibration damping spring can provide a certain tensile and compressive reserve, which has a buffering function and can give construction personnel a certain amount of time to deal with the situation, effectively avoiding engineering accidents.

[0030] 4. Good overall performance

[0031] The force measuring rod and the vibration damping spring of this invention are both steel structures with a strength no less than that of the two-force rod in engineering. The thickness of the force measuring rod is the same as that of the two-force rod. After the force measuring rod is connected to the two-force rod, the force measuring rod and the two-force rod are further connected by a screw. This invention can not only monitor the force on the two-force rod, but also serve as part of the two-force rod, making the force measuring rod and the two-force rod a whole.

[0032] 5. Simple structure and low cost

[0033] This invention includes a force measuring rod, a vibration damping spring, and a fiber optic grating sensor. It has a simple structure, low cost, significant economic benefits, and is easy to promote and use.

[0034] 6. Excellent corrosion resistance

[0035] The force measuring rod and vibration damping spring of this invention are made of steel and are galvanized, providing good corrosion resistance. Attached Figure Description

[0036] Figure 1This is a schematic diagram of the connection between the intelligent two-force bar force measuring device and the two-force bar as described in Embodiment 1.

[0037] Figure 2 This is an exploded view of an intelligent two-force bar force measuring device as described in Embodiment 1.

[0038] Figure 3 This is a front sectional view of the force measuring rod of the present invention as described in Embodiment 1.

[0039] In the diagram: 1-Force measuring rod, 11-Fiber optic through hole, 12-Fiber Bragg grating sensor, 13-Fiber optic lead-out hole I, 14-Connecting lug, 141-Screw hole, 142-Screw, 143-Nut, 2-Vibration damping spring, 3-Spring cap, 31-Fiber optic lead-out hole II.

[0040] 4-Two-force member, 5-Anchoring pad. Implementation Example 1

[0041] like Figures 1-2 As shown, an intelligent two-force bar force measuring device includes a force measuring rod 1 and a vibration damping spring 2. Both the force measuring rod 1 and the vibration damping spring 2 are steel structures, and both are galvanized. The strength of both the force measuring rod 1 and the vibration damping spring 2 is greater than or equal to the strength of the two-force bar 4. The force measuring rod 1 is a hollow round steel with an inner diameter the same as the outer diameter of the two-force bar 4, and its thickness is the same as that of the two-force bar 4. The anchoring end of the force measuring rod 1 has an external thread, and the connecting end of the force measuring rod 1 has both external and internal threads. Connecting lugs 14 are symmetrically arranged at the end of the connecting end of the force measuring rod 1, and threaded holes 143 are formed on the connecting lugs 14. The vibration damping spring 2 is sleeved in the middle of the force measuring rod 1, and both ends of the vibration damping spring 2 are connected to spring caps 3. The spring caps 3 are screwed to the external threads at both ends of the hollow steel pipe. The force measuring rod 1 has two optical fiber through holes 11 symmetrically arranged along its axial direction (see...). Figure 3 The end of the fiber optic through hole 11 at the anchoring end of the force measuring rod 1 has a fiber optic lead-out hole I13. The fiber optic lead-out hole I13 is connected to the end of the fiber optic through hole 11 by a rounded transition. The spring cap 3 installed at the anchoring end of the force measuring rod 1 has a corresponding fiber optic lead-out hole II31. The fiber optic lead-out hole I13 and the fiber optic lead-out hole II31 are circular holes. A fiber optic grating sensor 12 is attached in the fiber optic through hole 11. The optical fiber is led out from the fiber optic lead-out hole I13 and the fiber optic lead-out hole II31 in sequence.

[0042] The anchoring end of the force measuring rod 1 is anchored by the anchoring plate 5. The connecting end of the force measuring rod 1 is screwed to the two-force rod 4 through the internal thread. Then, the screw rod 142 is inserted into the screw hole 143, and the two ends of the screw rod 142 are fixed with nuts 143 to further enhance the integrity of the force measuring rod 1 and the two-force rod 4. Then, the fiber optic grating sensor 12 is connected to the controller to monitor the force on the two-force rod 4 in real time. Example 2

[0043] A construction method for an intelligent two-force bar force measuring device according to Embodiment 1 includes the following steps:

[0044] a. Material selection: Determine the inner diameter of the force measuring rod 1 based on the outer diameter of the two-force rod 4, ensuring that the inner diameter of the force measuring rod 1 is the same as the outer diameter of the two-force rod 4; determine the thickness of the force measuring rod 1 based on the thickness of the two-force rod 4, ensuring that the thickness of the force measuring rod 1 is the same as the thickness of the two-force rod 4; select steel material to manufacture the force measuring rod 1 and the vibration damping spring 2, ensuring that the strength of the force measuring rod 1 and the strength of the vibration damping spring 2 are greater than or equal to the strength of the two-force rod 4;

[0045] b. Prefabricated force measuring rod 1, the anchoring end of force measuring rod 1 is prefabricated with external thread, the connecting end of force measuring rod 1 is prefabricated with external thread and internal thread, the end of the connecting end of force measuring rod 1 is prefabricated with symmetrically arranged connecting ears 14, and the connecting ears 14 are opened with screw holes 143.

[0046] c. Prefabricated vibration damping spring 2 and spring cap 3, with the spring cap 3 installed at the anchoring end of the force measuring rod 1 and reserved with optical fiber lead-out hole II 31;

[0047] d. Opening holes: Two optical fiber through holes 11 are symmetrically opened along the axis of the force measuring rod 1. The optical fiber through hole 11 at the anchoring end of the force measuring rod 1 is reserved with optical fiber lead-out hole I13. The optical fiber lead-out hole I13 is connected to the end of the optical fiber through hole 11 with a rounded transition.

[0048] e. Attach the fiber Bragg grating sensor 12. Attach the fiber Bragg grating sensor 12 inside the fiber optic through-hole 11, and lead the fiber out from the fiber optic lead-out hole I 13.

[0049] f. Assembly: First, fix the spring cap 3 at one end of the force measuring rod 1 onto the force measuring rod 1. Then, put the vibration damping spring 2 into the force measuring rod 1. Finally, fix the spring cap 3 at the other end of the force measuring rod 1. Weld the spring cap 3 and the vibration damping spring 2 together into a whole. Then, apply preload or pretension to the vibration damping spring 2. At the same time, lead the optical fiber out from the optical fiber lead-out hole II 31.

[0050] g. Connection: The anchoring end of the force measuring rod 1 is anchored through the anchoring plate 5. Rivet holes are provided on the anchoring plate 5. Rivets are driven into the rivet holes to anchor the force measuring rod 1. The internal thread of the connecting end of the two-force rod 4 is engaged with the connecting end of the force measuring rod 1 to connect the two-force rod 4 and the force measuring rod 1 together. Then, the screw 142, which is engaged with the screw hole 143, is inserted into the screw hole 143. Then, the screw 142 is fixed with the nut 143 to further connect the force measuring rod 1 and the two-force rod 4. The fiber optic grating sensor 12 is connected to the controller.

[0051] After completing the above steps, the intelligent two-force bar force measuring device can be put into use. If necessary, it can be pre-used to check the fiber optic sensing status. After the check is completed, it can be put into use.

Claims

1. An intelligent two-force bar force measuring device, characterized in that: The device includes a force measuring rod (1) and a damping spring (2). The force measuring rod (1) is a hollow steel pipe with the same inner diameter and outer diameter as the two-force rod (4) and the same thickness as the two-force rod (4). The strength of the force measuring rod (1) and the strength of the damping spring (2) are not lower than the strength of the two-force rod (4). The anchoring end of the force measuring rod (1) has an external thread, and the connecting end of the force measuring rod (1) has an external thread and an internal thread. The damping spring (2) is sleeved in the middle of the force measuring rod (1). The two ends of the damping spring (2) are welded and fixed to the spring cap (3) respectively. The spring cap (3) is screwed to the external threads at both ends of the force measuring rod (1) to form an integral force-bearing structure. The force measuring rod (1) has two optical fiber through holes (11) symmetrically opened along its axis. The end of the optical fiber through hole (11) at the anchoring end of the force measuring rod (1) has an optical fiber lead-out hole I (13). The optical fiber lead-out hole I (13) and the end of the optical fiber through hole (11) are connected by a rounded transition to prevent the optical fiber from bending and breaking. The spring cap (3) installed at the anchoring end of the force measuring rod (1) has a corresponding optical fiber lead-out hole II (31). Fiber grating sensors (12) are pasted in both optical fiber through holes (11). The optical fiber of the fiber grating sensor (12) is smoothly led out through the optical fiber lead-out hole I (13) and the optical fiber lead-out hole II (31) in sequence. The end of the force measuring rod (1) is symmetrically provided with connecting ears (14), and a screw hole (141) is opened on the connecting ear (14). A screw (142) is inserted into the screw hole (141) and locked by a nut (143), so as to realize the double fixation of the threaded connection and mechanical locking between the force measuring rod (1) and the two force rod (4).

2. The intelligent two-force bar force measuring device according to claim 1, characterized in that: Both the optical fiber exit hole I (13) and the optical fiber exit hole II (31) are circular holes.

3. The intelligent two-force bar force measuring device according to claim 1, characterized in that: The damping spring (2) is a steel structure, and the surfaces of the force measuring rod (1) and the damping spring (2) are both galvanized for corrosion protection.

4. The intelligent two-force bar force measuring device according to claim 1, characterized in that: The anchoring end of the force measuring rod (1) is anchored through the anchoring plate (5), which has rivet holes for fixed installation.

5. The intelligent two-force bar force measuring device according to claim 1, characterized in that: The damping spring (2) is in a pre-compressed or pre-stretched energy storage state after assembly, which can provide buffer force and safety reserve when the two-force bar (4) fails.

6. A construction method for an intelligent two-force bar force measuring device, characterized in that: Includes the following steps: a. Material selection: Determine the inner diameter of the force measuring rod (1) according to the outer diameter of the two-force rod (4), so that the inner diameter of the force measuring rod (1) is the same as the outer diameter of the two-force rod (4); determine the thickness of the force measuring rod (1) according to the thickness of the two-force rod (4), so that the thickness of the force measuring rod (1) is the same as the thickness of the two-force rod (4); select steel to make the force measuring rod (1) and the damping spring (2), and make the strength of the force measuring rod (1) and the strength of the damping spring (2) not lower than the strength of the two-force rod (4); b. Prefabricated force measuring rod: Prefabricated external thread at the anchoring end of the force measuring rod (1), prefabricated external thread, internal thread and symmetrical connecting lug (14) at the connecting end of the force measuring rod (1), and screw hole (141) is machined on the connecting lug (14). c. Prefabricated damping spring and spring cap: Prefabricated damping spring (2) and spring cap (3), and reserved fiber optic lead-out hole II (31) on the spring cap (3) for installation on the anchor end of the force measuring rod (1); d. Opening fiber optic holes: Two fiber optic through holes (11) are symmetrically opened along the axial direction on the force measuring rod (1). Fiber optic lead-out hole I (13) is processed at the end of the fiber optic through hole (11) at the anchoring end of the force measuring rod (1), and the fiber optic lead-out hole I (13) and the end of the fiber optic through hole (11) are connected by an arc transition. e. Attaching the sensor: Attach the fiber optic grating sensor (12) into the two fiber optic through holes (11) respectively, and lead the fiber of the fiber optic grating sensor (12) out from the fiber optic lead-out hole I (13); f. Assembly: First, thread one end of the spring cap (3) onto the force measuring rod (1), then put the damping spring (2) into the middle of the force measuring rod (1), and then thread the other end of the spring cap (3) onto the force measuring rod (1). Weld the spring cap (3) and the damping spring (2) together. During the assembly process, apply preload or pretension to the damping spring (2) to keep it in an energy storage state. At the same time, lead out the optical fiber from the optical fiber lead-out hole II (31) of the spring cap (3). g. Installation and connection: Anchor the anchoring end of the force measuring rod (1) through the anchoring pad (5), connect the internal thread of the connecting end of the two-force rod (4) and the force measuring rod (1), then insert the screw (142) into the screw hole (141) of the connecting ear (14) and lock it with the nut (143) to achieve double fixation of the force measuring rod (1) and the two-force rod (4); connect the fiber optic grating sensor (12) to the controller to complete the construction and installation of the intelligent two-force rod force measuring device.

7. The construction method according to claim 6, characterized in that: In step f, after the damping spring (2) and the spring cap (3) are welded, ensure that the damping spring (2) is in a constant pre-compression or pre-tension state to provide continuous buffering and force reserve.

8. The construction method according to claim 6, characterized in that: In step g, the anchor plate (5) is fixed to the installation foundation by rivets to achieve rigid fixation of the anchor end of the force measuring rod (1).

9. The construction method according to claim 6, characterized in that: In step d, the two fiber optic through holes (11) are arranged symmetrically with the axis of the force measuring rod (1) as the center, so that the fiber optic grating sensor (12) forms a bidirectional symmetrical monitoring.

10. The construction method according to claim 6, characterized in that: In step a, the force measuring rod (1) and the vibration damping spring (2) are made of structural steel of the same specification, and are uniformly galvanized for corrosion protection after fabrication.

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