Centering mechanism for ultrasonic hole detection instrument

Abstract

The utility model relates to the field of bored pile hole forming detection technology, especially the center alignment mechanism for ultrasonic hole forming detector, solves the shortcoming of the prior art in the bored pile hole forming detection, including the orifice cover and positioning mechanism, the positioning mechanism is used for the center point of the auxiliary ultrasonic probe alignment steel casing, the orifice cover includes the support frame body of placing on the steel casing, the center of support frame body is fixedly connected with the square frame, the upper end of support frame body is fixedly connected with the support plate, the center of support plate is equipped with the square mouth of being suitable for square frame, the positioning mechanism includes a pair of movable pull rope, a pair of pull rope positive cross in the center of square frame, the positioning mechanism includes a plurality of synchronous displacement positioning wheel, the support frame body includes a plurality of support main rod, the positioning wheel slides along the lower side of support main rod, the utility model has the characteristics of strong practicality and convenient alignment.

Description

Technical Field

[0001] This utility model relates to the field of bored pile hole detection technology, specifically to a center alignment mechanism for an ultrasonic hole detection instrument. Background Technology

[0002] Ultrasonic borehole testing instruments determine parameters such as borehole diameter, depth, verticality, and sediment thickness in cast-in-place piles. The testing principle involves lowering a probe and using it to emit ultrasonic waves to inspect the borehole walls on four sides, calibrating the propagation rate of the drilling mud. During testing, the instrument records the time it takes for the ultrasonic waves emitted by the probe to hit the borehole wall and bounce back. Multiplying this time by the velocity equals the distance, thus determining the borehole diameter.

[0003] When lowering the ultrasonic probe, the detector needs to be installed in the matching borehole support first, and then the borehole support is erected on the steel casing buried at the borehole opening. The ultrasonic probe is then lowered from the center of the borehole opening to detect the required data. However, in actual field use, most of the diameters of the bored pile holes are large, and the borehole support is not long enough to be stably erected on the steel casing. In this case, the field personnel often set up a placement frame at the borehole opening, and some even use channel steel, wooden boards, etc., instead of a placement frame before placing the borehole support. However, when the staff lowers the probe, it is difficult to accurately find the center point of the hole, which affects the detection accuracy.

[0004] Therefore, it is essential to design a center alignment mechanism for ultrasonic hole forming testing instruments that is both practical and easy to align. Utility Model Content

[0005] The purpose of this invention is to provide a center alignment mechanism for an ultrasonic hole forming tester, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a center alignment mechanism for an ultrasonic hole drilling testing instrument, comprising a hole cover and a positioning mechanism. The positioning mechanism is used to assist the ultrasonic probe in aligning the center point of the steel casing. The orifice cover includes a support frame placed on a steel casing. A square frame is fixedly connected to the center of the support frame, and a support plate is fixedly connected to the upper end of the support frame. A square opening adapted to the square frame is opened at the center of the support plate.

[0007] According to the above technical solution, the positioning mechanism includes a pair of movable pull ropes; A pair of ropes cross each other at the center of the square frame.

[0008] According to the above technical solution, the positioning mechanism includes a number of positioning wheels that can be moved synchronously, the support frame includes a number of support rods, the positioning wheels slide along the lower side of the support rods, and the number of positioning wheels are arranged inside the steel casing.

[0009] According to the above technical solution, a guide groove is provided through the middle side of the main support rod, a guide rod is fixedly connected to the inner side of the guide groove, a vertical shaft is slidably fitted through the guide rod, and the vertical shaft passes through the positioning wheel and is fixedly connected to it. A spring is sleeved on the outer side of the guide rod, and the spring is located on the side of the guide groove near the center of the support frame.

[0010] According to the above technical solution, the support plate is configured as a disc and has an annular plate rotatably connected to its outer side. The four sides of the annular plate are provided with oblique grooves, and the upper end of the vertical shaft extends into the oblique grooves.

[0011] According to the above technical solution, the upper end face of the support plate is flush with the upper end face of the annular plate.

[0012] According to the above technical solution, a support roller is provided on the outer side of the main support rod, and the support roller is positioned corresponding to the outer side of the annular plate.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are: By setting up a hole cover mounted on a steel casing, with a square frame at the center and a support plate providing stable support for the hole support, the ultrasonic probe can be slowly lowered into the bored pile hole from the square frame. This facilitates operation and improves stability during testing. Furthermore, a positioning mechanism is included to easily locate the hole's center point. The ultrasonic probe is lowered from the center point, and after entering the hole, it finds the correct reflected wave from the hole wall, saving the current ultrasonic wave propagation rate. Testing the hole wall condition at that rate allows for a fast, accurate, and true reflection of the hole's condition, eliminating the need for manual visual centering, saving time and effort, and improving convenience and work efficiency. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the annular plate of this utility model; Figure 3 This is a three-dimensional schematic diagram of the inside of the orifice cover of this utility model; Figure 4 This is a cross-sectional schematic diagram of the present invention; In the diagram: 1. Support plate; 101. Positioning wheel; 102. Support rod; 103. Guide groove; 104. Guide rod; 105. Vertical shaft; 106. Spring component; 2. Orifice cover; 3. Square frame; 4. Pull rope; 5. Annular plate; 501. Inclined groove; 502. Support roller; 6. Steel casing. Detailed Implementation

[0015] 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.

[0016] Please see Figure 1-4 This utility model provides a technical solution: a center alignment mechanism for an ultrasonic hole forming testing instrument, comprising a hole cover 2 and a positioning mechanism. The positioning mechanism is used to assist the ultrasonic probe in aligning the center point of the steel casing 6; The orifice cover 2 includes a support frame placed on a steel casing 6. A square frame 3 is fixedly connected to the center of the support frame, and a support plate 1 is fixedly connected to the upper end of the support frame. The center of the support plate 1 has a square opening that matches the square frame 3.

[0017] Preferably, by setting the orifice cover 2 on the steel casing 6, and setting a square frame 3 at the center, and setting a support plate 1 to stably support the orifice support, the ultrasonic probe can be slowly lowered from the square frame 3 into the grouting pile hole, which is convenient for operation and improves the stability during testing. In addition, a positioning mechanism is also set to facilitate finding the center point of the hole, so that the ultrasonic probe is lowered from the center point, finds the correct hole wall reflection wave after entering the hole, saves the current ultrasonic wave propagation rate, and tests the hole wall condition at the current rate. It can quickly and accurately reflect the true condition of the hole, without the need for manual visual inspection to find the center point, saving time and effort, and improving convenience and work efficiency.

[0018] The positioning mechanism includes a pair of movable pull ropes 4; A pair of ropes 4 cross at the center of the square frame 3.

[0019] Preferably, the cross-rope method is used to align the center point of the hole. Specifically, before drilling begins, the theoretical center coordinates of the pile hole are determined using a total station or theodolite, and at least two mutually perpendicular reference points are marked around the hole opening. Then, workers fix one end of an inelastic nylon line to one reference point, stretch it to the opposite reference point and tighten it. Similarly, a second vertical line is pulled out, and the intersection point is aligned with the theoretical center of the pile. Then, the hole cover 2 can be placed. During testing, the ultrasonic probe is aligned with the cross intersection point, and the rope 4 can be pulled out to complete the hole center positioning.

[0020] The positioning mechanism includes several positioning wheels 101 that can be moved synchronously, and the support frame includes several support rods 102. The positioning wheels 101 slide along the lower side of the support rods 102, and the several positioning wheels 101 are arranged inside the steel casing 6.

[0021] Optionally, to further improve operational convenience, positioning wheels 101 are provided to center the orifice cover 2 itself. Specifically, in this embodiment, four positioning wheels 101 are provided, all of which move along the four supporting main rods 102. The positioning wheels 101 are located inside the steel casing 6. When the four positioning wheels 101 are controlled to move outward along the supporting main rods 102 simultaneously, since the four positioning wheels 101 move synchronously and the displacement distance is the same, when all four positioning wheels 101 are in contact with the inner wall of the steel casing 6, it can be determined that the center position of the orifice cover 2 is aligned with the center position of the steel casing 6. It is only necessary to pre-determine the fixed position of the hole forming detector on the orifice cover 2 and record the current position so that the ultrasonic probe is always in the center position of the square frame 3. Then, when the center position of the orifice cover 2 is aligned with the center position of the steel casing 6, it can be determined that the ultrasonic probe is also in the center position of the hole when it is lowered. This can further facilitate and quickly align the center position, which is highly practical and can be used for positioning steel casings 6 of various diameters, making it versatile.

[0022] A guide groove 103 is provided through the middle side of the main support rod 102. A guide rod 104 is fixedly connected to the inner side of the guide groove 103. A vertical shaft 105 is slidably fitted through the guide rod 104. The vertical shaft 105 passes through the positioning wheel 101 and is fixedly connected to it. A spring 106 is sleeved on the outer side of the guide rod 104, and the spring 106 is located on the side of the guide groove 103 near the center of the support frame.

[0023] Preferably, by providing springs 106, the positioning wheels 101 are initially positioned at the outermost end of the guide groove 103. When alignment is required, the four positioning wheels 101 are pushed to move towards the center, and the vertical shaft 105 moves along the guide rod 104 for guidance until it moves into the range within the steel casing 6. The orifice cover 2 can then be placed on the upper side of the steel casing 6. Under the reset action of the springs 106, the four positioning wheels 101 unfold outwards and abut against the inner wall of the steel casing 6, thereby aligning the orifice cover 2 with the center position. Furthermore, during hole drilling inspection, external factors may sometimes cause equipment vibration or positional deviation, affecting the detection accuracy of the ultrasonic probe. Therefore, the spring force of the springs 106 applies pressure to the four positioning wheels 101 outwards, further fixing the orifice cover 2 to the steel casing 6, improving the connection stability between the two rather than simply stacking them. This achieves center alignment of the orifice cover 2 while also fixing it to the steel casing 6, improving the stability of the inspection. The structural design is simple and highly practical.

[0024] The support plate 1 is disc-shaped and has an annular plate 5 rotatably connected to its outer side. The four sides of the annular plate 5 are provided with inclined grooves 501, and the upper end of the vertical shaft 105 extends into the inclined grooves 501.

[0025] Preferably, in the above embodiment, it is necessary to center the four positioning wheels 101. To further improve the convenience of on-site operation, an annular plate 5 is provided. Specifically, when it is necessary to drive the four positioning wheels 101 to center, the operator rotates the annular plate 5. The annular plate 5 rotates relative to the orifice cover 2. The vertical shaft 105 is restricted by the inclined groove 501 and guided by the guide rod 104, so that the inclined groove 501 pushes the vertical shaft 105 to move along the guide rod 104, thereby synchronously driving the four positioning wheels 101 to center. Then, the orifice cover 2 is placed on the upper side of the steel casing 6, the annular plate 5 is released, and the positioning wheels 101 automatically reset, thus aligning the position. Through the setting of the annular plate 5, synchronous control of the four positioning wheels 101 is achieved. The operation is simple, and it also further restricts the synchronous movement of the four positioning wheels 101, ensuring the synchronicity of the unfolding of the four positioning wheels 101, thereby improving the accuracy of center alignment of the orifice cover 2.

[0026] The upper surface of the support plate 1 is flush with the upper surface of the annular plate 5.

[0027] Preferably, the upper surface of the support plate 1 is flush with the upper surface of the annular plate 5, so that the overall upper surface area is large. After the position is aligned, it is convenient for the staff to perform relevant operations of the testing instruments on the overall end surface.

[0028] A support roller 502 is provided on the outer side of the support main rod 102, and the support roller 502 corresponds to the outer side of the annular plate 5.

[0029] Preferably, a support roller 502 is provided to provide rolling support for the annular plate 5, thereby reducing rotational friction and facilitating rotational operation by the staff.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A center alignment mechanism for an ultrasonic hole forming testing instrument, comprising a hole cover (2) and a positioning mechanism, characterized in that: The positioning mechanism is used to assist the ultrasonic probe in aligning the center point of the steel casing (6); The orifice cover (2) includes a support frame placed on a steel casing (6), a square frame (3) is fixedly connected to the center of the support frame, and a support plate (1) is fixedly connected to the upper end of the support frame. The center of the support plate (1) is provided with a square opening that matches the square frame (3).

2. The center alignment mechanism for an ultrasonic hole forming testing instrument according to claim 1, characterized in that: The positioning mechanism includes a pair of movable pull ropes (4); A pair of ropes (4) cross each other at the center of the square frame (3).

3. The center alignment mechanism for an ultrasonic hole forming testing instrument according to claim 1, characterized in that: The positioning mechanism includes several positioning wheels (101) that can be moved synchronously, and the support frame includes several support rods (102). The positioning wheels (101) slide along the lower side of the support rods (102), and the several positioning wheels (101) are arranged on the inner side of the steel casing (6).

4. The center alignment mechanism for an ultrasonic hole forming testing instrument according to claim 3, characterized in that: The main support rod (102) has a guide groove (103) through the middle side, and a guide rod (104) is fixedly connected to the inner side of the guide groove (103). The guide rod (104) is slidably connected to a vertical shaft (105), and the vertical shaft (105) is connected to the positioning wheel (101). A spring (106) is sleeved on the outside of the guide rod (104), and the spring (106) is located on the side of the guide groove (103) near the center of the support frame.

5. The center alignment mechanism for an ultrasonic hole forming testing instrument according to claim 4, characterized in that: The support plate (1) is configured as a disc and is rotatably connected to an annular plate (5) on the outside. The four sides of the annular plate (5) are provided with oblique grooves (501), and the upper end of the vertical shaft (105) extends into the oblique grooves (501).

6. The center alignment mechanism for an ultrasonic hole forming testing instrument according to claim 5, characterized in that: The upper surface of the support plate (1) is flush with the upper surface of the annular plate (5).

7. The center alignment mechanism for an ultrasonic hole forming testing instrument according to claim 5, characterized in that: The outer side of the main support rod (102) is provided with a support roller (502), which corresponds to the outer side of the annular plate (5).

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