A rapid positioning device for acoustic logging tubes in pile foundations

Abstract

This application discloses a rapid positioning device for sonic logging tubes in pile foundations, comprising a pile hole, a reinforcing cage disposed within the pile hole, the reinforcing cage including a plurality of vertical main bars spaced circumferentially and a plurality of outer stirrups welded to the outside of the vertical main bars at vertical intervals, and further including: a plurality of inner stirrups welded to the inside of the vertical main bars at vertical intervals; a positioning member connected to the inner stirrups to position the sonic logging tube; and a connecting member, one end of which is welded to the inner stirrup, and the other end of which is welded to the positioning member. The inner and outer stirrups work together to form a double constraint, thereby enhancing the overall rigidity and shape stability of the reinforcing cage. The connecting member, as a rigid connecting arm, together with the positioning member, ensures that the sonic logging tube maintains a constant preset distance from the main body of the reinforcing cage in the vertical direction, which is beneficial for the effective transmission of ultrasonic signals and for improving the quality of the final bridge pile body.

Description

Technical Field

[0001] This application relates to the field of acoustic logging tube positioning, and in particular to a rapid positioning device for acoustic logging tubes in pile foundations. Background Technology

[0002] Bridge pile foundations are the primary form of bridge foundation. They transfer the load of the superstructure to deep, stable strata through the piles, thereby ensuring the stability and safety of the bridge structure. The bearing capacity and stability of the pile foundations directly affect the overall performance and service life of the bridge; therefore, it is essential to ensure their reliable quality, safety, and durability during bridge construction.

[0003] Acoustic wave transmission is currently the main method for detecting the integrity of cast-in-place concrete piles. It is achieved by transmitting and receiving ultrasonic waves through acoustic tubes pre-embedded in the reinforcing cage. By measuring the acoustic parameters (such as sound velocity and frequency) of the ultrasonic waves propagating in the concrete, the uniformity of the pile concrete, the presence of defects (such as broken piles, necking, etc.), and the location and extent of the defects are determined. This is an indispensable and crucial step in ensuring the quality of pile foundation engineering and assessing the safe bearing capacity of the pile foundation.

[0004] The traditional method of fixing sonic logging tubes involves placing the tubes close to the inner wall of the pile foundation reinforcement cage and then binding them with wire. While this method is convenient and simple, the sonic logging tubes are prone to shifting during concrete pouring, resulting in non-parallelism or changes in spacing. In addition, the binding method can cause the ultrasonic signal transmission to be abnormal if the distance between the sonic logging tube and the reinforcement cage is too small, leading to distorted received signals and an inability to accurately reflect the quality of the pile concrete.

[0005] Furthermore, during the cleaning of the pile foundation borehole, if the sonic logging pipe is placed close to the pile foundation reinforcement cage, mud, gravel, and other debris will get trapped in the gap between the sonic logging pipe and the pile foundation reinforcement cage, which will seriously weaken the overall strength and integrity of the pile body, making it difficult to pass the pile foundation test and meet the quality standards. In some cases, it may even lead to the need to demolish the pile foundation and recast it.

[0006] Therefore, it is necessary to propose a rapid positioning device for sonic logging tubes in pile foundations. Rapidly positioning the sonic logging tubes has become an important technical problem that urgently needs to be solved. Utility Model Content

[0007] This application provides a rapid positioning device for sonic logging tubes in pile foundations, aiming to solve the problems in the prior art where an insufficient distance between the sonic logging tube and the reinforcing cage causes abnormal ultrasonic signal transmission, resulting in distorted received signals and an inability to accurately reflect the quality of the pile concrete. It also addresses the problem that placing the sonic logging tube too close to the reinforcing cage can cause mud, gravel, and other debris to get trapped in the gap between the sonic logging tube and the reinforcing cage, severely weakening the overall strength and integrity of the pile.

[0008] To achieve the above objectives, this application proposes a rapid positioning device for a pile foundation sonic logging tube, comprising a pile hole, a reinforcing cage disposed within the pile hole, the reinforcing cage comprising a plurality of vertical main bars spaced apart along the circumference and a plurality of outer stirrups welded at vertical intervals to the outside of the vertical main bars, and further comprising: a plurality of inner stirrups, the plurality of inner stirrups being welded at vertical intervals to the inside of the vertical main bars; a positioning member, the positioning member being connected to the inner stirrups to position the sonic logging tube; and a connecting member, one end of the connecting member being welded to the inner stirrups, and the other end of the connecting member being connected to the positioning member.

[0009] In some embodiments, the positioning element includes a positioning arc, which is integrally formed with the connector.

[0010] In some embodiments, the positioning element further includes: a connecting plate; a screw rod, the screw rod being screwed to the connecting plate; a fixing ring, the fixing ring being rotatably disposed on the screw rod; and a double-layer hoop wire, one end of the double-layer hoop wire being connected to the fixing ring, and the other end of the hoop wire being connected to the connecting plate, the double-layer hoop wire forming a snap-fit ​​gap, the double-layer hoop wire being snapped onto the positioning arc through the snap-fit ​​gap.

[0011] In some embodiments, the positioning element includes: a positioning ring and a positioning ring welded connector.

[0012] In some embodiments, it further includes: a reinforcing rib, which is welded to the inner stirrup.

[0013] This application proposes a rapid positioning device for sonic logging tubes in pile foundations. The device includes a pile hole containing a reinforcing cage. The cage includes several vertical main bars spaced circumferentially and several outer stirrups welded to the outside of the main bars at vertical intervals. It also includes several inner stirrups welded to the inside of the main bars at vertical intervals; a positioning component connected to the inner stirrups to position the sonic logging tubes; and a connector, with one end welded to an inner stirrup and the other end welded to the positioning component. During the construction of a bridge pile, the reinforcing cage with the sonic logging tubes fixed inside is placed into the pile hole, concrete is injected, and after curing, the bridge pile is formed. The reinforcing cage is formed by several main bars, outer stirrups, and inner stirrups. The outer stirrups mainly restrain the outward deformation of the main bars, maintaining the outer dimensions of the reinforcing cage. The inner stirrups, working in conjunction with the outer stirrups, create a double constraint, enhancing the overall rigidity and shape stability of the reinforcing cage. Furthermore, the inner stirrups provide a welding base for the connectors facing inwards. The connectors, acting as rigid connecting arms, determine the safe distance between the sonic logging tube and the main reinforcing bars of the cage. This structural arrangement, when installed and used in conjunction with the inner stirrups, forms a stable and reliable positioning structure. It ensures that the sonic logging tube maintains a constant, preset distance from the main body of the reinforcing cage in the vertical direction, effectively avoiding the offset and uneven spacing problems caused by traditional wire binding. It also ensures the signal propagation path during the acoustic transmission method, guaranteeing the accuracy and reliability of the detection data. Moreover, the fixed gaps created by the structure provide unobstructed flow space for concrete slurry and mud or gravel during hole cleaning, fundamentally solving the problem of debris accumulation in narrow gaps, preventing the formation of weak areas inside the pile body, and significantly improving the overall strength and integrity of the pile body. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0015] Figure 1 This is a schematic diagram of a rapid positioning device for a pile foundation acoustic logging tube in one embodiment of this application;

[0016] Figure 2 This is a schematic diagram of another rapid positioning device for pile foundation acoustic logging tubes in one embodiment of this application;

[0017] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0018] Figure 4 This is a three-dimensional structural diagram of a positioning element in one embodiment of this application.

[0019] In the diagram: 1. Pile hole; 2. Outer stirrup; 3. Vertical main reinforcement; 4. Reinforcing bar; 5. Positioning ring; 6. Connector; 7. Inner stirrup; 8. Double-layer stirrup; 9. Screw; 10. Connecting plate; 11. Fixing ring; 12. Snap-fit ​​gap. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] See Figure 1 and Figure 2 As shown, this application proposes a rapid positioning device for a pile foundation sonic logging tube, including a pile hole 1, a reinforcing cage installed inside the pile hole 1, the reinforcing cage including a plurality of vertical main bars 3 arranged at intervals along the circumference and a plurality of outer stirrups 2 welded at intervals along the vertical direction to the outside of the vertical main bars 3, and further including: a plurality of inner stirrups 7, the plurality of inner stirrups 7 being welded at intervals along the vertical direction to the inside of the vertical main bars 3; a positioning member, the positioning member being connected to the inner stirrups 7 to position the sonic logging tube; and a connecting member 6, one end of the connecting member 6 being welded to the inner stirrups 7, and the other end of the connecting member 6 being connected to the positioning member.

[0022] Among them, pile hole 1 is excavated and shaped by excavation equipment such as rotary drilling machine. The bridge pile is a cast-in-place pile. After pile hole 1 is shaped, a steel cage is placed in and a sonic logging tube is placed in. Then concrete grouting is carried out, and after curing, the bridge pile can be formed.

[0023] Among them, the steel reinforcement cage greatly improves the tensile, bending, and shear resistance of bridge piles, combining the compressive strength of concrete with the tensile strength of steel bars, enabling it to withstand various complex loads. The steel reinforcement cage is formed by several main bars, outer stirrups 2, and inner stirrups 7.

[0024] Specifically, during the ground fabrication of the reinforcing cage, the outer stirrups 2 and inner stirrups 7 are welded to the outer and inner sides of the vertical main reinforcement 3, respectively, according to the design drawings. Then, one end of the connector 6 is welded to the inner stirrup 7 at predetermined vertical intervals, ensuring that the connector 6 points towards the center of the reinforcing cage. Finally, the positioning device is installed on the other end of the connector 6. The sonic logging tube is placed in the positioning device and fixed. The entire reinforcing cage with the sonic logging tube installed is hoisted and placed into the pre-formed pile hole 1. Due to the positioning device, a preset and fixed gap is automatically formed between the sonic logging tube and the main reinforcement of the reinforcing cage. Concrete is then poured, and after curing, a high-quality bridge pile is formed.

[0025] The outer stirrups 2 and the inner stirrups 7 work together to maintain the shape of the reinforcing cage and ensure that the diameter of the reinforcing cage is the set value. The sonic logging tube is positioned by a positioning component, which is connected to the inner stirrups 7 of the reinforcing cage by a connector 6 to ensure that the distance between the sonic logging tube and the reinforcing cage is the preset value.

[0026] Specifically, in the process of forming bridge piles, a steel cage with a fixed sonic logging tube is placed into the pile hole 1, concrete is injected, and after curing, a bridge pile is formed. The steel cage is composed of several main bars, outer stirrups 2, and inner stirrups 7. The outer stirrups 2 are mainly used to restrain the outward deformation of the vertical main bars 3, thus maintaining the outer contour dimensions of the steel cage. The inner stirrups 7 work together with the outer stirrups 2 to form a double constraint, thereby enhancing the overall rigidity and shape stability of the steel cage; on the other hand, the inner stirrups 7 provide a welding base facing inward for the connector 6. The connector 6, as a rigid connecting arm, determines the safe distance between the sonic logging tube and the main bars of the steel cage. Through the installation and use of the above structure, a stable and reliable positioning structure is formed.

[0027] Therefore, it can be seen that the outer stirrups 2 and inner stirrups 7 work together to maintain the shape of the steel cage and ensure that the diameter of the steel cage is the set value. The sonic logging tube is quickly positioned by the positioning component, which is connected to the inner stirrups 7 of the steel cage by the connector 6, to ensure that the distance between the sonic logging tube and the steel cage is the preset value. This is beneficial to the effective transmission of ultrasonic signals and to improving the quality of the final bridge pile body.

[0028] Understandably, this application, through the rigid structure of the connecting piece 6 and positioning piece on the inner stirrup 7, ensures that the sonic logging tube maintains a constant preset distance from the main body of the reinforcing cage in the vertical direction, effectively avoiding the offset and uneven spacing problems caused by traditional wire binding. This ensures the signal propagation path during the sonic transmission method detection, guaranteeing the accuracy and reliability of the detection data. Furthermore, the fixed gap formed by the above structure provides unobstructed flow space for concrete slurry and mud or gravel during hole cleaning, fundamentally solving the problem of debris accumulation in narrow gaps, avoiding the formation of weak areas with inadequate wrapping inside the pile body, and significantly improving the overall strength and integrity of the pile body. Understandably, integrating the sonic logging tube positioning process into the prefabrication stage of the reinforcing cage allows for simple placement of the sonic logging tube during on-site construction, greatly simplifying the on-site installation steps, achieving rapid positioning, and improving construction efficiency and standardization.

[0029] In this embodiment, the diameter of the pile hole 1 is preferably 150cm. The number of vertical main reinforcement bars 3 is 25, and the distance between the inner wall of the pile hole 1 and the outer side of the reinforcement cage is 8cm. The reinforcement cage is provided with 4 rows of connectors 6 and positioning members along the circumference. Each row of connectors 6 and positioning members includes multiple connectors 6 and positioning members arranged at intervals along the vertical direction to form an effective positioning of the 4 sonic logging tubes.

[0030] See Figure 2 , Figure 3 and Figure 4 As shown, the positioning component includes a positioning arc, which is integrally formed with the connector 6. The positioning arc is adapted to the diameter of a sonic logging pipe of a specific diameter to position the sonic logging pipe. During the fixing process of the sonic logging pipe, the sonic logging pipe can be tied to the positioning arc with a wire.

[0031] See Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the positioning component further includes: a connecting plate 10; a screw 9, the screw 9 being screwed to the connecting plate 10; a fixing ring 11, the fixing ring 11 being rotatably disposed on the screw 9; and a double-layer hoop 8, one end of the double-layer hoop 8 being connected to the fixing ring 11, and the other end of the double-layer hoop 8 being connected to the connecting plate 10, with a snap-fit ​​gap 12 formed between the double-layer hoop 8. The double-layer hoop 8 is snapped onto the positioning arc through the snap-fit ​​gap 12. The double-layer hoop 8 has two loops of hoop wire, which are spaced apart, and the gap between the two loops of hoop wire is the snap-fit ​​gap 12. The top end of the double-layer hoop 8 is snapped onto the top end of the positioning arc through the snap-fit ​​gap 12, effectively forming a connection between the double-layer hoop 8 and the positioning arc. Because the screw 9 is screwed to the connecting plate 10, the screw 9 will move relative to the connecting plate 10. At this time, it will cause the fixing ring 11 to move away from or towards the connecting plate 10. One end of the double-layer hoop 8 is connected to the fixing ring 11, and the other end of the double-layer hoop 8 is connected to the connecting plate 10. As a result, during the process of screwing the screw 9, the fixing ring 11 will move closer to or away from the connecting plate 10. Since one end of the double-layer hoop 8 is welded to the fixing ring 11, the movement of the fixing ring 11 will cause the double-layer hoop 8 to deform, so that the diameter of the double-layer hoop 8 will change accordingly to adapt to sonic logging pipes of different diameters. The double-layer hoop 8 is used to replace the iron wire to fix the sonic logging pipe.

[0032] Common outer diameters of sonic logging tubes for bridge piles include 50mm, 54mm, and 57mm. The selection of the tube diameter is primarily determined by the pile length; the deeper the pile, the greater the attenuation of the ultrasonic signal. To ensure the probe can be successfully lowered and a clear signal obtained, the longer the pile, the larger the required inner diameter of the logging tube. The variable-diameter double-layer hoop wire 8 can accommodate logging tubes of different outer diameters, improving the practicality of the device.

[0033] In this embodiment, the double-layer hoop 8 not only positions the sonic logging tube but also effectively fixes it, thus preventing displacement and ensuring the accuracy of the measurement results. The screw 9 has a screwing end, which facilitates its tightening.

[0034] See Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the connecting plate 10 includes: a first connecting area 102, which has a through hole 103 for the connector 6 to pass through; the connector 6 is a U-shaped steel bar, which passes through the through hole 103 in the first connecting area 102 and is welded to the first connecting area 102. A second connecting area 101 has a threaded hole adapted to the screw 9. The screw 9 is screwed into the second connecting area 101, and one end of the hoop 8 is connected to the second connecting area 101, while the other end of the hoop 8 is welded to the retaining ring 11.

[0035] See Figure 1 and Figure 2 As shown, in some embodiments, it further includes: reinforcing ribs 4, which are welded to the inner stirrups 7. Preferably, three reinforcing ribs 4 are provided, and the three reinforcing ribs 4 are connected end to end to form a triangular structure. The triangular structure of the reinforcing ribs 4 helps to improve the stability of the reinforcing cage and effectively maintain the shape of the reinforcing cage.

[0036] Example 2

[0037] In this embodiment, the parts that are the same as in Embodiment 1 are given the same reference numerals, and the same text descriptions are omitted.

[0038] See Figure 1 As shown, the positioning component in this embodiment includes a positioning ring 5 and a welded connector 6. The positioning ring 5 is adapted to the diameter of a sonic logging tube of a specific diameter to position and fix the sonic logging tube. This effectively prevents the sonic logging tube from shifting, thereby ensuring the accuracy of the measurement results.

[0039] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A rapid positioning device for a pile foundation acoustic logging tube, comprising a pile hole (1), wherein a reinforcing cage is provided inside the pile hole (1), the reinforcing cage comprising a plurality of vertical main bars (3) spaced apart along the circumference and a plurality of outer stirrups (2) welded at vertical intervals to the outside of the vertical main bars (3), characterized in that, Also includes: A plurality of inner stirrups (7) are welded at vertical intervals to the inner side of the vertical main reinforcement (3); Positioning element, which is connected to the inner stirrup (7) to position the acoustic tube; Connector (6), one end of which is welded to the inner stirrup (7), and the other end of which is connected to the positioning member.

2. The rapid positioning device for pile foundation acoustic logging tubes according to claim 1, characterized in that, The positioning element includes: The positioning arc is integrally formed with the connector (6).

3. The rapid positioning device for pile foundation acoustic logging tubes according to claim 2, characterized in that, The positioning element also includes: Connecting plate (10); Screw (9), which is screwed to the connecting plate (10); A fixing ring (11) is rotatably mounted on the screw (9). Double-layer hoop wire (8), one end of which is connected to the fixing ring (11), and the other end of which is connected to the connecting plate (10). The double-layer hoop wire (8) forms a snap-fit ​​gap (12), and the double-layer hoop wire (8) is snapped onto the positioning arc through the snap-fit ​​gap (12).

4. The rapid positioning device for pile foundation acoustic logging tubes according to claim 1, characterized in that, The positioning element includes: Positioning ring (5), wherein the positioning ring (5) is welded to the connector (6).

5. A rapid positioning device for pile foundation acoustic logging tubes according to any one of claims 1-4, characterized in that, Also includes: Reinforcing rib (4), which is welded to the inner stirrup (7).

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