Foundation pit steel support beam axial force monitoring structure

Abstract

This utility model discloses an axial force monitoring structure for a steel support beam in a foundation pit, including a hinged head, a support sleeve, a top support bolt, and an axial force gauge. A positioning plate is attached to the end of the hinged head furthest from the steel support beam. The positioning plate has mating holes that match the support sleeve. Multiple radiating positioning grooves are evenly distributed along the circumference of the mating holes. Reinforcing ribs that fit and engage with the positioning grooves are evenly distributed on the outer wall of the support sleeve. A protective sleeve, corresponding to the top support bolt, is vertically fixed to the outer wall of the support sleeve. An end cap is fastened to the protective sleeve, and a compression spring is located inside the end cap. Multiple mounting grooves are evenly distributed along the circumference of the outer wall of the protective sleeve. Locking posts are fixed to the mounting grooves via the top support springs. The end cap has a locking groove that engages with the locking post and an unlocking through hole. The advantage of this utility model is that it can easily achieve coaxial alignment between the support sleeve and the hinged head, effectively preventing the top support bolt from loosening and falling off, and ensuring accurate measurement by the axial force gauge.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit engineering monitoring technology, and in particular to a structure for monitoring the axial force of a foundation pit steel support beam. Background Technology

[0002] In foundation pit engineering, axial force gauges are commonly used to monitor the axial force of steel support beams. The working principle is that when the support beam is subjected to force, the axial force gauge installed at its end will be compressed and deformed. Its shell will deform synchronously, which will be transmitted to the steel string and transformed into a change in the stress of the steel string, thereby changing the vibration frequency of the steel string. At this time, the electromagnetic coil will excite the steel string and measure its vibration frequency. The frequency signal is transmitted to the frequency meter through the cable, and the axial force on the support beam can be measured.

[0003] The existing structure for monitoring the axial force of steel support beams mainly includes a hinged head, a support sleeve, an axial force gauge, and top support bolts. First, a hinged head (i.e., the load-bearing node component at the end of the steel support beam) is coaxially installed at the end of the steel support beam. Then, the support sleeve is coaxially welded to the end face of the hinged head. After the welding cools, the axial force gauge is placed in the end of the support sleeve furthest from the steel support beam, and four top support bolts are used to vertically pass through the support sleeve from the outside to the inside to support and fix the axial force gauge. During monitoring, the initial frequency of the axial force gauge is measured and recorded before applying prestress to the steel support beam. Then, prestress can be applied to the steel support beam. Once the applied prestress reaches the design standard, normal measurement can begin, thereby measuring the reaction force and load of the steel support beam using the axial force gauge.

[0004] The existing axial force monitoring structure for steel support beams has a large gap between the axial force gauge and the inner wall of the support sleeve. When the axial force gauge is fixed and positioned by four top support bolts, its positioning stability and accuracy are poor. Especially when the support structure deforms, causing the steel support beam to deform, the top support bolts are prone to rotating outward and loosening, which can cause the axial force gauge to tilt, resulting in inaccurate positioning and affecting measurement accuracy. Furthermore, during actual installation, the welding of the support sleeve and the hinge head is not easily aligned precisely due to the worker's skill level, causing the axial force gauge to be off-center. The measured axial force value is less than the actual force, which can lead to structural instability and safety hazards. In addition, the support sleeve is horizontal along with the steel support beam. When it rains, the lower half of the support sleeve cavity is prone to accumulating water, which can corrode the support sleeve or affect the service life of the axial force gauge. Summary of the Invention

[0005] The purpose of this utility model is to provide a structure for monitoring the axial force of steel support beams in foundation pits, addressing the shortcomings of existing technologies.

[0006] To achieve the above objectives, the present invention can adopt the following technical solution:

[0007] The axial force monitoring structure for the foundation pit steel support beam of this utility model includes a hinged head installed at the end of the steel support beam, a support sleeve fixed to the hinged head, and an axial force gauge installed in the support sleeve and fixed by a plurality of top support bolts. A fixed positioning plate is attached to the end of the hinged head away from the steel support beam. The positioning plate has a mating hole that matches the support sleeve. The central axis of the mating hole is aligned with the axis of the hinged head. Multiple positioning grooves extending outward in a radiating pattern are evenly distributed along the circumference of the mating hole. The outer wall of the support sleeve is evenly distributed with reinforcing ribs that are adapted to and engage with the positioning groove; a protective sleeve is vertically fixed on the outer wall of the support sleeve and is fitted onto the outside of the top support bolt. An end cap is adapted to be fastened on the protective sleeve, and a compression spring is provided inside the end cap to press against the top support bolt; multiple mounting grooves are evenly distributed circumferentially on the outer wall of the protective sleeve, and a locking pin is fixedly connected to the mounting groove by the top support spring. The end cap is provided with a slot that engages with the locking pin and an unlocking through hole that communicates with the slot.

[0008] Furthermore, for ease of installation and disassembly, the positioning plate is fixedly connected to the hinge head by a plurality of connecting bolts evenly distributed along its circumference.

[0009] Furthermore, in order to effectively drain the water inside the support sleeve during rainy days, a drainage groove is provided on the inner wall of the support sleeve along the length direction, and the bottom wall of the drainage groove has a sloping structure that slopes downward from one end to the other.

[0010] Furthermore, in order to enable the compression spring to accurately and securely press against the support bolt, a first limiting groove is provided at the center of the inner wall of the end cap, and a second limiting groove corresponding to the first limiting groove is provided at the center of the top wall of the bolt head of the support bolt. One end of the compression spring is fixedly connected to the first limiting groove, and the other end is pressed against the second limiting groove.

[0011] The advantages of this invention are that the mating holes on the positioning plate and the positioning grooves evenly distributed on the mating holes allow for easy coaxial alignment of the support sleeve and the movable head, regardless of the worker's skill level. This ensures quick and accurate mating of the support sleeve and the movable head, preventing eccentricity during axial force gauge installation from affecting subsequent axial force monitoring. Furthermore, the protective sleeve fitted over the top support bolt, along with the end cap with a compression spring, continuously presses against the top support bolt, effectively preventing it from loosening or falling off. This ensures the top support bolt remains firmly supporting the axial force gauge, reducing skewness during monitoring and guaranteeing accurate measurement. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 yes Figure 1 A schematic diagram of the middle positioning plate.

[0014] Figure 3 yes Figure 1 Enlarged sectional view of the center support bolt.

[0015] Figure 4 yes Figure 1 Enlarged cross-sectional view along the AA direction. Detailed Implementation

[0016] 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.

[0017] like Figure 1 As shown, the axial force monitoring structure for the foundation pit steel support beam of this utility model includes a movable head 1 installed at the end of the steel support beam, a support sleeve 2 fixed to the movable head 1, and an axial force gauge 4 that is spaced inside the support sleeve 2 and fixed by three sets of top support bolts 3.

[0018] Specifically, the hinge head 1 is coaxially mounted on the end of the steel support beam, and a fixed positioning plate 5 is attached to the end of the hinge head 1 away from the steel support beam. The positioning plate 5 is a circular plate. To facilitate installation and disassembly, the positioning plate 5 can be attached and fixed to the hinge head 1 by multiple connecting bolts 6 evenly distributed on the positioning plate 5 along the circumference.

[0019] like Figure 2 As shown, a mating hole 7 matching the support sleeve 2 is provided at the center of the positioning plate 5. The central axis of the mating hole 7 is consistent with the axis of the hinge head 1, and thus with the axis of the steel support beam. Four positioning grooves 8 are evenly distributed circumferentially on the mating hole 7. At this time, reinforcing ribs 9 are evenly distributed on the outer wall of the support sleeve 2, corresponding to and fitting into the positioning grooves 8. Thus, when the support sleeve 2 is mated, the reinforcing ribs 9 can be aligned with the positioning grooves 8 through the snap-fit, so that the support sleeve 2 and the mating hole 7 can be quickly and accurately snapped together. This ensures the coaxial alignment of the support sleeve 2 and the hinge head 1, and then the support sleeve 2 and the hinge head 1 can be easily and quickly welded together without being limited by the worker's skill level, ensuring the rapid and accurate mating of the support sleeve 2 and the hinge head 1.

[0020] like Figure 3As shown, three sets of protective sleeves 10 are evenly distributed circumferentially on the outer wall of the support sleeve 2. The three sets of protective sleeves 10 are fitted onto the outside of the three sets of top support bolts 3 and are vertically welded to the outer wall of the support sleeve 2. Each protective sleeve 10 is coaxial with the corresponding top support bolt 3. An end cap 11 is fitted and fastened to the protective sleeve 10. The end cap 11 has a compression spring 12 that can press against the top support bolt 3. In order to ensure that the compression spring 12 can accurately and firmly press against the top support bolt 3, a first limiting groove should be provided at the center of the inner wall of the end cap 11. 13. A second limiting groove 14 corresponding to the first limiting groove 13 is provided at the center of the top wall of the bolt head of the top support bolt 3. At this time, one end of the compression spring 12 is fixed in the first limiting groove 13, and the other end can be pressed into the second limiting groove 14, thereby continuously pressing the top support bolt 3, effectively preventing the top support bolt 3 from loosening and falling off, ensuring that the top support bolt 3 always firmly supports the axial force gauge 4 located in the support sleeve 2, reducing the skewness of the axial force gauge 4 during the monitoring process, and ensuring the accurate measurement of the axial force gauge 4.

[0021] In addition, multiple mounting slots 15 are evenly distributed circumferentially on the outer wall of the sheath 10. A locking pin 17 is fixed in the mounting slot 15 by a top support spring 16. The locking pin 17 extends out of the mounting slot 15. At this time, a slot 18 is provided on the inner side wall of the end cap 11 that can be engaged with the locking pin 17, so as to achieve a stable fastening between the end cap 11 and the sheath 10 by using the locking pin 17. Of course, an unlocking hole 19 is also required to be opened at the center of the bottom of each slot 18, penetrating the side wall of the end cap 11. When it is necessary to remove the end cap 11, simply insert a rod into the unlocking hole 19 and push the locking pin 17 into the mounting slot 15 to easily unlock the end cap 11 and remove it.

[0022] Furthermore, in order to effectively drain water from the support sleeve 2 during rainy weather, such as... Figure 4 As shown, a drainage groove 20 can also be opened along the length direction on the inner wall of the support sleeve 2. Since the hinge head 1 and the support sleeve 2 will maintain a horizontal posture synchronously with the steel support beam after being installed on the end of the steel support beam, when the support sleeve 2 is connected to the positioning plate 5, it should just be that the drainage groove 20 is located at the bottom of the support sleeve 2. At this time, the bottom wall of the drainage groove 20 has a slope structure that slopes downward from one end to the other end, so that the water accumulated in the support sleeve 2 can be drained quickly, avoiding water corrosion of the support sleeve 2 or damage to the axial force gauge 4, and ensuring the service life of the axial force gauge 4.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

Claims

1. A structure for monitoring the axial force of a steel support beam in a foundation pit, comprising a movable head installed at the end of the steel support beam, a support sleeve fixedly connected to the movable head, and an axial force gauge mounted in the support sleeve and fixed by a plurality of supporting bolts; characterized in that: A fixed positioning plate is attached to the end of the swivel head away from the steel support beam. The positioning plate has a mating hole that matches the support sleeve. The central axis of the mating hole is consistent with the axis of the swivel head. Multiple positioning grooves extending outward in a divergent pattern are evenly distributed along the circumference of the mating hole. Reinforcing ribs that fit and engage with the positioning grooves are evenly distributed on the outer wall of the support sleeve. A protective sleeve corresponding to the outside of the top support bolt is vertically fixed on the outer wall of the support sleeve. An end cap is fitted onto the protective sleeve. The end cap has a compression spring that presses against the top support bolt. Multiple mounting grooves are evenly distributed along the circumference of the outer wall of the protective sleeve. A locking pin is fixed in the mounting groove by the top support spring. The end cap has a locking groove that engages with the locking pin and an unlocking through hole that communicates with the locking groove.

2. The axial force monitoring structure for the steel support beam in the foundation pit according to claim 1, characterized in that: The positioning plate is fixedly connected to the hinge head by a plurality of connecting bolts evenly distributed along its circumference.

3. The axial force monitoring structure for the steel support beam in the foundation pit according to claim 1, characterized in that: A drainage groove is provided on the inner wall of the support sleeve along the length direction, and the bottom wall of the drainage groove has a sloping structure that slopes downward from one end to the other.

4. The axial force monitoring structure for the foundation pit steel support beam according to claim 1, characterized in that: A first limiting groove is provided at the center of the inner wall of the end cap, and a second limiting groove corresponding to the first limiting groove is provided at the center of the top wall of the bolt head of the top support bolt. One end of the compression spring is fixed in the first limiting groove, and the other end is pressed against the second limiting groove.

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