Connecting device for pile foundation frictional resistance testing reinforcement meter

Abstract

The invention discloses a connecting device for a pile foundation frictional resistance testing reinforcement meter, and relates to the technical field of pile foundation frictional resistance testing. The steel bar meter comprises a steel bar meter body, connecting rods, two pile longitudinal bars, a threading pipe, a plastic hoop, a threading pipe connector, a wire protection sleeve and two connecting hoops, the two ends of the steel bar meter body are each provided with a connecting rod sleeve, and a wire is arranged on the steel bar meter body; the connecting rod is connected with the reinforcement meter main body through the connecting rod sleeve; the two pile longitudinal bars are arranged in a mirror symmetry mode. And the wire is positioned in the threading pipe. According to the invention, the connection rod of the steel bar meter main body and the pile longitudinal bar are connected together through the connection hoop, the steel bar meter main body and the pile longitudinal bar are tightly fixed together through the clamping force generated by the elastic deformation of the connection hoop, and the force borne by the steel bar is transmitted through the friction force, so that the steel bar meter main body can synchronously sense the stress change of the steel bar.

Description

A connection device for a rebar gauge used for pile foundation skin friction testing Technical Field

[0001] This invention belongs to the field of pile foundation skin friction testing, and more specifically, relates to a connection device for a rebar gauge used in pile foundation skin friction testing. Background Technology

[0002] The skin friction of pile foundations has a significant impact on the bearing capacity of pile foundations. It is crucial to accurately obtain the skin friction of pile foundations through on-site testing. The vibrating wire rebar stress gauge is an instrument specifically designed for testing the internal rebar stress of reinforced concrete structural members. The traditional structure of this type of stress gauge mainly includes three components: the stress gauge body, the sleeve (also known as the connecting rod sleeve), and the connecting rod. Currently, the connection methods for directly connecting the connecting rod to the rebar are mainly two: binding with cable ties and welding. Welding is preferred due to its stability.

[0003] However, the traditional connecting rod structure has significant defects in positioning, which means that external tools or manual assistance are required to ensure welding accuracy during the welding process. More troublesome is that the high temperature generated during the welding process can potentially damage the stress gauge. In order to effectively mitigate the adverse effects of high temperature, the current common practice is to pour water on the sensor area (that is, the part where the stress gauge is located) or wrap it with a damp cloth to cool it down, so as to avoid damage to the sensor due to excessive temperature. Although these measures have a certain degree of protection, the sensor area is still susceptible to the effects of high temperature.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a connection device for a steel bar gauge for testing the skin friction of pile foundations, thereby solving the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: a connection device for a rebar gauge for testing the skin friction of pile foundations, comprising: a rebar gauge body, a connecting rod, two pile longitudinal bars, a conduit, a plastic sleeve, a conduit connector and a conductor protective sleeve, and two connecting clamps. The rebar gauge body has connecting rod sleeves at both ends, and a conductor is provided on the rebar gauge body. The connecting rod is connected to the rebar gauge body through the connecting rod sleeves. The two pile longitudinal bars are arranged symmetrically in mirror image. The conductor is located inside the conduit. The conduit is fixedly connected to both ends of the rebar gauge body through the plastic sleeves. Both ends of the conduit are connected to the conduit connector and the conductor protective sleeve. The connecting rod is connected to the pile longitudinal bars through the connecting clamps.

[0007] Optionally, a mating cover is rotatably connected to the connecting clamp, a pin is provided between the mating cover and the connecting clamp, a bolt is provided on the mating cover that is threadedly connected to the connecting clamp, a nut is threadedly connected to the bolt, and the nut is located on one side of the mating cover.

[0008] Optionally, each of the two connecting clamps is connected to a mating seat on its opposite side, and a rivet is provided between the two mating seats.

[0009] Optionally, the left and right ends of the main body of the rebar gauge are connected to the connecting rod sleeve and the connecting rod, and the two ends of the connecting rod are connected to the longitudinal reinforcement of the pile through connecting clamps, and the main body of the rebar gauge is located on the longitudinal reinforcement of the pile.

[0010] Optionally, the wire is introduced into the conduit, and a plastic sleeve is provided at the wire's entry point for connecting the conduit.

[0011] Optionally, the conduit is marked with graduations every cm, so that the connecting clamp is positioned above and below the wire joint of the rebar meter body.

[0012] Optionally, one end of the connecting rod is provided with a thread, and the thread is threadedly connected to the connecting rod sleeve.

[0013] Optionally, the wire introduction section divides the conduit into two parts to allow the wire to be introduced. The conduit connector and the wire protective sleeve are connected to the conduit, so that the wire is not susceptible to damage from external factors.

[0014] Optionally, the inner wall of the connecting clamp is provided with anti-slip texture, which is distributed in a spiral shape.

[0015] Optionally, the conduit connector and wire protective sleeve are made of high-strength PVC material, and their inner walls are provided with sealing rings, which can effectively prevent impurities such as mud and water from entering the conduit and corroding the wires.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time: 1. By connecting the connecting rod of the rebar gauge body and the longitudinal reinforcement of the pile together through the connecting clamp, the clamping force generated by the elastic deformation of the connecting clamp itself tightly fixes the rebar gauge body and the longitudinal reinforcement of the pile together. The force on the reinforcement is transmitted by friction, so that the rebar gauge body can synchronously sense the stress change of the reinforcement; 2. The wire of the rebar gauge body is connected to a graduated conduit. According to the scale, the rebar gauge body can be accurately positioned to ensure the accuracy of the test calculation results. At the same time, it can prevent the sensor wires and interfaces from being damaged during the concrete pouring process.

[0017] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings: Figure 1 is a schematic diagram of the reinforcing steel structure; Figure 2 is a schematic diagram of the conduit structure; Figure 3 is a schematic diagram of the connecting clamp structure.

[0019] The attached diagram lists the components represented by each number as follows: 1. Main body of the reinforcing bar; 2. Connecting rod sleeve; 3. Connecting rod; 4. Longitudinal reinforcement of the pile; 5. Conductor; 6. Conduit; 7. Plastic sleeve; 8. Conduit connector and conductor protective sleeve; 9. Connecting clamp; 91. Bolt; 92. Rivet; 93. Butt joint; 94. Nut; 95. Pin; 96. Butt joint cover.

[0020] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0021] The invention will now be described in further detail with reference to the accompanying drawings.

[0022] Please refer to Figures 1-3. In this embodiment, a connection device for a rebar gauge for testing the skin friction of pile foundations is provided, including: a rebar gauge body 1, a connecting rod 3, two pile longitudinal bars 4, a conduit 6, a plastic sleeve 7, a conduit connector and a wire protection sleeve 8, and two connecting clamps 9. Connecting rod sleeves 2 are provided at both ends of the rebar gauge body 1, and a wire 5 is provided on the rebar gauge body 1. The connecting rod 3 is connected to the rebar gauge body 1 through the connecting rod sleeve 2. The two pile longitudinal bars 4 are arranged symmetrically in mirror image. The wire 5 is located inside the conduit 6. The conduit 6 is fixedly connected to both ends of the rebar gauge body 1 through the plastic sleeve 7. Both ends of the conduit 6 are connected to the conduit connector and the wire protection sleeve 8. The connecting rod 3 is connected to the pile longitudinal bars 4 through the connecting clamps 9.

[0023] The connecting rod 3 of the rebar gauge body 1 and the longitudinal reinforcement 4 of the pile are connected together by connecting clamp 9. The clamping force generated by the elastic deformation of the connecting clamp 9 itself tightly fixes the rebar gauge body 1 and the longitudinal reinforcement 4 together. The force on the reinforcement is transmitted by friction, so that the rebar gauge body 1 can synchronously sense the stress change of the reinforcement. The wire 5 of the rebar gauge body 1 is connected to the graduated conduit 6. According to the scale, the rebar gauge body 1 can be accurately positioned to ensure the accuracy of the test calculation results. At the same time, it can prevent the sensor wire 5 and interface from being damaged during the concrete pouring process.

[0024] As shown in Figure 3, in this embodiment, a mating cover 96 is rotatably connected to the connecting clamp 9. A pin 95 is provided between the mating cover 96 and the connecting clamp 9. A bolt 91 is provided on the mating cover 96 and threadedly connected to the connecting clamp 9. A nut 94 is threadedly connected to the bolt 91 and the nut 94 is located on one side of the mating cover 96. A mating seat 93 is connected to the opposite side of each of the two connecting clamps 9. A rivet 92 is provided between the two mating seats 93.

[0025] As shown in Figure 1, in this embodiment, the left and right ends of the main body 1 of the steel reinforcement are connected by connecting rod sleeve 2 and connecting rod 3. The two ends of the connecting rod 3 are connected to the longitudinal reinforcement 4 of the pile by connecting clamps 9. The main body 1 of the steel reinforcement is located on the longitudinal reinforcement 4 of the pile.

[0026] The connecting rod sleeve 2 has an internal thread that matches the external thread at the end of the connecting rod 3. Tightening the thread ensures a stable connection between the rebar gauge body 1 and the connecting rod 3, preventing relative displacement during testing and guaranteeing accurate force transmission. The connecting rod 3 is made of high-strength alloy material with excellent mechanical properties, effectively withstanding various stresses generated during pile foundation construction and use, preventing deformation or breakage of the connecting rod 3 from affecting test results. As one of the main load-bearing components of the pile foundation, the connection quality between the pile longitudinal reinforcement 4 and the rebar gauge body 1 directly affects the reliability of the friction resistance test. The connecting rod 3 and the pile longitudinal reinforcement 4 are tightly connected by the connecting clamp 9, enabling the rebar gauge body 1 to accurately reflect the stress state of the pile longitudinal reinforcement 4 under different working conditions, providing a reliable data source for the accurate calculation of pile foundation friction resistance.

[0027] As shown in Figure 2, in this embodiment, the wire 5 is introduced into the conduit 6, and a plastic sleeve 7 is provided at the entry point of the wire 5 for connecting the conduit 6.

[0028] The plastic sleeve 7 is made of engineering plastic with good flexibility and insulation. Its inner wall is tightly attached to the outer surface of the conductor 5 and forms an interference fit with the port of the conduit 6. This not only effectively prevents external moisture, mud and other impurities from entering the conduit 6 through the gap between the conductor 5 and the conduit 6, avoiding the conductor 5 from being affected by moisture or contamination and thus affecting the stability of signal transmission, but also provides a certain degree of protection for the conductor 5, preventing it from being damaged at the port of the conduit 6 due to long-term friction or external pulling. The conduit 6 is made of high-strength rigid pipe, and its main function is to provide a closed and sturdy channel for the conductor 5, preventing the conductor 5 from being squeezed, collided or scratched by hard objects such as concrete and steel bars during the pile foundation construction process, and ensuring that the test signal can be transmitted from the main body 1 of the steel bar gauge to the external data acquisition equipment without interference.

[0029] As shown in Figure 2, in this embodiment, the conduit 6 is marked with graduations every 10cm, so that the connecting clamp 9 is above and below the wire 5 joint of the main body 1 of the steel bar.

[0030] Meanwhile, the scale on the protective tube for the joint can accurately locate the position of the main body 1 of the rebar meter, ensuring the accuracy of the test calculation results.

[0031] As shown in Figure 2, one end of the connecting rod 3 in this embodiment is provided with a thread, which is threaded to the connecting rod sleeve 2.

[0032] The threaded connection not only facilitates the quick installation and disassembly of the connecting rod 3 and the connecting rod sleeve 2, making it convenient to replace or adjust components during on-site construction or later maintenance, but also provides stable connection strength. This ensures that during pile foundation construction, the main body 1 of the steel reinforcement gauge forms a solid overall structure with the connecting rod 3 and the connecting rod sleeve 2, preventing loosening of the connection due to external forces such as vibration and impact, thereby ensuring the continuity and reliability of the test data.

[0033] As shown in Figure 2, in this embodiment, the wire 5 is introduced into the conduit 6 by dividing it into two parts, so that the wire 5 can be introduced. The conduit connector and the wire protective sleeve 8 are connected to the conduit 6, so that the wire 5 can be protected from damage by external factors.

[0034] The special design of the conductor introduction section ensures the stable routing of conductor 5 within the conduit 6, preventing damage to the conductor due to bending or squeezing. The conduit connector and conductor protective sleeve 8 further provide double protection for the lead-out end of conductor 5. Their tight connection with the conduit 6 not only isolates conductor 5 from external moisture, soil, corrosive substances, etc., but also effectively buffers mechanical collisions and friction that may occur during construction, thereby ensuring the stability of the signal transmission of conductor 5 and ensuring that the stress data collected by the rebar gauge body 1 can be accurately and without interference transmitted to the external receiving equipment.

[0035] The inner wall of the connecting clamp 9 in this embodiment is provided with anti-slip texture, which is distributed in a spiral shape.

[0036] The spiral anti-slip texture design significantly increases the friction between the connecting clamp 9 and the main body 1 of the rebar gauge or the rebar being measured. When the connecting clamp 9 is tightened by bolts or other fasteners, the spiral texture forms a multi-point engagement with the contact surface, effectively preventing the connecting clamp 9 from sliding relative to the other under long-term stress or vibration.

[0037] In this embodiment, the conduit connector and wire protective sleeve 8 are made of high-strength PVC material, and their inner walls are provided with sealing rings, which can effectively prevent impurities such as mud and water from entering the conduit 6 and causing corrosion to the wire 5.

[0038] Working principle: Before installing the vibrating wire rebar stress gauge at the predetermined position in the pile foundation rebar cage, firstly, prepare precisely cut conduit 6, cutting off two conduits 6, one of which must be of the same length as the conductor 5; next, according to the cut conduit 6, fix the two cut conduits 6 to both ends of the rebar gauge body 1 using plastic clamps 7, and insert the conduit 6 into the left conduit 6, installing the conduit connector and conductor protective sleeve 8 at the conductor 5 inlet, connecting the conduit 6 and conductor 5 into a whole; based on the secure connection with the rebar gauge body 1 and conduit 6, connect the connecting rod 3 to the pile longitudinal reinforcement 4 using connecting clamps 9. At this point, the entire installation process is successfully completed, and the vibrating wire rebar gauge body 1 is ready to begin its stress monitoring task.

[0039] To verify the practical application effect and reliability of this connection device in pile foundation skin friction testing, a field comparative experiment was conducted. A bored pile project of a bridge engineering project was selected. Using both traditional welding connection methods and the connection clamp method provided in this embodiment, identical vibrating wire rebar gauges of the same model were installed in three test piles with the same geological conditions, pile diameter (1.2m), and pile length (30m). During the experiment, stress data of both sets of rebar gauges were continuously collected before concrete pouring (initial state), during concrete pouring, during curing, and in the later loading stage. The integrity of the conductor and the survival rate of the rebar gauges were recorded. The experimental results showed that the rebar gauges using the connection device of this embodiment could stably collect clear and continuous stress signals at all stages, with data fluctuations within ±2με, meeting the testing accuracy requirements. The conductor protection measures were effective; the conductors of the rebar gauges in all three test piles were intact, and no signal interruption occurred due to construction damage. The survival rate of the rebar gauges reached 100%. The traditional welding method for connecting rebar gauges resulted in zero-point drift of one gauge (15 με) during welding due to localized high temperatures. Furthermore, the conductors of two test pile rebar gauges were damaged during concrete vibration due to lack of effective protection, leading to data acquisition interruptions and a survival rate of only 66.7%. Regarding force transmission efficiency, a comparative analysis of the rebar gauge readings during the loading phase and the pile top load showed that the force transmission error of the connection device in this embodiment was controlled within 3%, significantly better than the 5%–8% error range of the traditional welding method. In addition, the average installation time for a single rebar gauge using this connection device is approximately 15 minutes, a significant reduction compared to the traditional welding method (average 40 minutes). It also eliminates the need for specialized welding personnel, reducing reliance on the skill level of construction workers. The above experimental data fully demonstrate that this connection device for testing rebar gauges used in pile foundation skin friction has significant advantages in ensuring testing accuracy, protecting conductor safety, improving installation efficiency, and enhancing reliability.

[0040] This invention is not limited to the embodiments described above. Anyone should understand that structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention. Technical aspects, shapes, and structures not described in detail in this invention are all publicly known technologies.

Claims

1. A connection device for a rebar gauge used for testing the skin friction of pile foundations, characterized in that, include: The steel reinforcement meter body (1) has connecting rod sleeves (2) at both ends and a conductor (5) on it; a connecting rod (3) is connected to the steel reinforcement meter body (1) through the connecting rod sleeves (2); two pile longitudinal bars (4) are arranged symmetrically in mirror image; a conduit (6) is used for the conductor (5) inside the conduit (6); a plastic sleeve (7) is used to fix the conduit (6) to both ends of the steel reinforcement meter body (1); a conduit connector and conductor protection sleeve (8) is used to connect both ends of the conduit (6); and two connecting clamps (9) are used to connect the connecting rod (3) to the pile longitudinal bars (4).

2. The connection device for a rebar gauge for testing the skin friction of pile foundations according to claim 1, characterized in that, A mating cover (96) is rotatably connected to the connecting clamp (9). A pin (95) is provided between the mating cover (96) and the connecting clamp (9). A bolt (91) is provided on the mating cover (96) and threadedly connected to the connecting clamp (9). A nut (94) is threadedly connected to the bolt (91). The nut (94) is located on one side of the mating cover (96).

3. The connection device for a rebar gauge for testing the skin friction of pile foundations according to claim 2, characterized in that, Each of the two connecting clamps (9) is connected to a mating seat (93) on one side of the opposite side, and a rivet (92) is provided between the two mating seats (93).

4. The connection device for a rebar gauge for testing the skin friction of pile foundations according to claim 1, characterized in that, The left and right ends of the main body (1) of the steel reinforcement are connected to the connecting rod (3) through the connecting rod sleeve (2). The two ends of the connecting rod (3) are connected to the longitudinal reinforcement (4) of the pile through the connecting clamp (9). The main body (1) of the steel reinforcement is located on the longitudinal reinforcement (4) of the pile.

5. The connection device for a rebar gauge for testing the skin friction of pile foundations according to claim 1, characterized in that, The conductor (5) is introduced into the conduit (6), and a plastic sleeve (7) is provided at the connection point of the conductor (5) for connecting the conduit (6).

6. The connection device for a rebar gauge for testing the skin friction of pile foundations according to claim 1, characterized in that, The conduit (6) has graduation marks every 10cm, so that the connecting clamp (9) is above and below the conductor (5) joint of the steel bar body (1).

7. The connection device for a rebar gauge for testing the skin friction of pile foundations according to claim 1, characterized in that, One end of the connecting rod (3) is provided with a thread, and the thread is threadedly connected to the connecting rod sleeve (2).

8. The connection device for a rebar gauge for testing the skin friction of pile foundations according to claim 1, characterized in that, The lead wire (5) section divides the conduit (6) into two parts, allowing the lead wire (5) to be introduced. The conduit connector and the lead wire protective sleeve (8) are connected to the conduit (6), so that the lead wire (5) can be protected from damage by external factors.

9. The connection device for a rebar gauge for testing the skin friction of pile foundations according to claim 1, characterized in that, The inner wall of the connecting clamp (9) is provided with anti-slip texture, which is distributed in a spiral shape.

10. The connection device for a rebar gauge for testing the skin friction of pile foundations according to claim 1, characterized in that, The conduit connector and wire protection sleeve (8) are made of high-strength PVC material, and their inner walls are equipped with sealing rings.

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