A positioning device and positioning method for locating the position of a pile foundation reinforcement cage

Abstract

The present invention provides a positioning device and a positioning method for locating the position of a pile foundation steel cage, wherein the positioning device includes a catheter, a fixed line, a movable line, an ultrasonic detector, a DTU device and a terminal device, the catheter is sequentially provided with a plurality of fixed lines along its length direction, the catheter is fixed inside the steel cage by the fixed lines, the catheter extends from the upper end to the bottom end of the steel cage, the central axis of the catheter coincides with the central axis of the steel cage, the catheter is a hollow structure, the ultrasonic detector is movably arranged inside the catheter, and is connected to the movable line, the ultrasonic detector moves in the catheter under the traction of the movable line, the DTU device is installed on the ultrasonic detector, and the ultrasonic detector is wirelessly connected to the terminal device through the DTU device. Based on the positioning device, a corresponding positioning method is given, and by using the positioning device and the positioning method, the position of the steel cage in the pile foundation hole can be accurately determined.

Description

Technical Field

[0001] The invention relates to the field of ultrasonic detection and the field of bridge bored pile construction, and in particular to a positioning device and a positioning method for locating a pile foundation reinforcement cage. Background Art

[0002] The pile foundation is an important load-bearing component of the bridge and plays an indispensable role in the bridge. Therefore, the safety of the pile foundation is related to the safety of the entire bridge. The pile foundation is mainly composed of steel cages and concrete. However, during the construction of the pile foundation, the steel cage is easily offset in the pile hole due to uncontrollable placement of the steel cage in the pile hole. After pouring concrete, the concrete protective layer on one side of the pile foundation is easily too low. This will cause the steel bars in the pile foundation to rust easily, and the anchoring is not enough to ensure that the steel bars and concrete work together, which seriously threatens the safety of the pile foundation and thus affects the safety of the entire bridge. Therefore, it is very necessary to locate the position of the steel cage in the pile foundation and correct the offset in time. A method for positioning a pile foundation steel cage construction provided by a Chinese invention patent application with publication number CN112982412A and a method for positioning a pile foundation steel cage positioning frame and an underwater method for positioning a pile foundation steel cage provided by a Chinese invention patent application with publication number CN112663597A both provide devices for positioning steel cages. Both patents use a combination of fixtures or positioning frames to position the steel cage when lowering it so that it does not deviate. The operation is complicated and it is not clear whether there is an operation error, so that the steel cage still deviates in the pile hole. Therefore, it is very necessary to propose a positioning device and positioning method that can clearly locate the specific position of the steel cage in the pile foundation hole. Summary of the invention

[0003] In order to achieve the above object, the technical solution adopted by the present invention is:

[0004] A positioning device for locating a pile foundation steel cage comprises a conduit, a fixed line, a movable line, an ultrasonic detector, a DTU device and a terminal device, wherein the conduit is sequentially provided with a plurality of fixed lines along its length direction, the conduit is fixed inside the steel cage through the fixed lines, the conduit extends from the upper end to the bottom end of the steel cage, the central axis of the conduit coincides with the central axis of the steel cage, the conduit is a hollow structure, the ultrasonic detector is movably arranged inside the conduit and connected to the movable line, the ultrasonic detector moves in the conduit under the traction of the movable line, the DTU device is mounted on the ultrasonic detector, and the ultrasonic detector is wirelessly connected to the terminal device through the DTU device.

[0005] Furthermore, the conduit is a tubular structure formed by crisscross bundling, and is made of steel bars or alloy.

[0006] Furthermore, the hollow area of ​​the conduit is equal to 10-15 times the bundling area.

[0007] Furthermore, three fixing wires are evenly arranged at the same height of the catheter.

[0008] Furthermore, the fixed lines at two adjacent heights on the conduit are 0.5-1 m apart.

[0009] Based on the above positioning device, the present invention also provides a positioning method for locating the position of a pile foundation reinforcement cage, comprising the following steps:

[0010] Step 1: Make the catheter as described above;

[0011] Step 2: Insert the conduit into the steel cage and fix the conduit on the steel cage by binding with a fixing wire. During the binding and fixing process, use a tape measure to position the conduit so that the conduit is at the center of the steel cage.

[0012] Step 3: Driving pile foundation holes;

[0013] Step 4: lower the steel cage obtained in step 2 into the pile foundation hole;

[0014] Step 5: After connecting the ultrasonic detector to the active line, move the ultrasonic detector slowly from the catheter to the bottom of the pile foundation hole until it reaches the bottom of the pile foundation hole; during the movement, the ultrasonic detector transmits the detected data information to the terminal device through the DTU device, and the terminal device draws the position image of the steel cage in the pile foundation hole according to the received data information.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention discloses a positioning device for locating the position of a pile foundation steel cage, and provides a corresponding positioning method based on the positioning device. By utilizing the positioning device and the positioning method, the position of the steel cage in the pile foundation hole can be accurately determined, so that when the steel cage is offset, it can be corrected in time, and the steel cage can be prevented from offsetting by repeated positioning and measurement, thereby avoiding pouring concrete when the steel cage is offset, resulting in too low a concrete protective layer, easy rusting of the steel cage in the pile foundation, insufficient anchoring, inability to ensure coordinated work between the steel cage and concrete, and threatening the safety of the pile foundation.

[0017] 2. The present invention can be applied to a variety of bored piles, and is convenient to construct, has simple structural calculations, is easy to operate, has high result accuracy, and has high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a top view style and an overall style of the conduit of the present invention tied on the steel cage.

[0019] Figure 2 It is a schematic diagram of the structure of the catheter of the present invention when it is flattened and rolled up. In the figure, a is a bundled structure and b is a hollow structure.

[0020] Figure 3 The present invention is a schematic diagram of the structure of the steel cage placed in the pile foundation hole, in which (a) is a vertical view, (b) is a plan view, and (c) is an ultrasonic detector ranging X i .

[0021] Figure 4 It is a schematic diagram of drawing a steel cage position image according to the present invention.

[0022] Main component symbols

[0023] In the figure: steel cage 1, conduit 2, fixed line 3, movable line 4, ultrasonic detector 5, pile foundation hole 6.

[0024] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0025] See also Figure 1 to Figure 2 In a preferred embodiment of the present invention, a positioning device for locating the position of a pile foundation steel cage includes a catheter 2, a fixed line 3, a movable line 4, an ultrasonic detector 5, a DTU device, and a terminal device. The catheter 2 is sequentially provided with a plurality of fixed lines 3 along its length direction, and the catheter 2 is fixed to the inside of the steel cage 1 by the fixed lines 3. The catheter 2 extends from the upper end to the bottom end of the steel cage 1, and the central axis of the catheter 2 coincides with the central axis of the steel cage 1. The catheter 2 is a hollow structure, and the ultrasonic detector 5 is movably arranged inside the catheter 2 and connected to the movable line 4. The ultrasonic detector 5 moves in the catheter 2 under the traction of the movable line 4, and the DTU device is installed on the ultrasonic detector 5, and the ultrasonic detector 5 is wirelessly connected to the terminal device through the DTU device.

[0026] In the present invention, the catheter 2 is used to place the ultrasonic detector 5 and limit the position of the ultrasonic detector 5 so that the ultrasonic detector 5 is in the center of the steel cage 1 during the entire detection process, which is convenient for the subsequent rapid depiction of the position image of the pile foundation hole 6 and the steel cage 1. In the present invention, the catheter 2 is a tubular structure formed by criss-cross bundling, which is made of steel bars or alloys. The diameter of the catheter 2 is slightly larger than the size of the ultrasonic detector 5 to limit the position of the ultrasonic detector 5 while not hindering the operation of the ultrasonic detector 5 in the catheter 2. In order to avoid the catheter 2 being bundled too densely or too sparsely, it is preferred that the hollow area of ​​the catheter 2 is equal to 10-15 times the bundling area. In this way, it is prevented that the catheter 2 is bundled too densely and the hollow area is small, which causes the ultrasonic wave to reach the hole wall in the catheter 2. There are many obstacles, and then the accurate position of the steel cage 1 cannot be accurately measured. At the same time, it is also prevented that the catheter 2 is bundled too sparsely and not strong, and is easy to fall apart. In the present invention, the conduit 2 is fixed at the center of the steel cage 1 by a fixing wire 3. Preferably, three fixing wires 3 are evenly arranged at the same height of the conduit 2 so that the conduit 2 can be stably fixed at the center of the steel cage 1. Furthermore, the fixing wires 3 at two adjacent heights on the conduit 2 are 0.5-1m apart to reinforce the position of the conduit 2 in the steel cage 1 so that the conduit 2 is not easily displaced.

[0027] Based on the above positioning device, the present invention also provides a positioning method for locating the position of a pile foundation reinforcement cage, comprising the following steps:

[0028] Step 1: making the catheter 2 described above;

[0029] Step 2: insert the conduit 2 into the steel cage 1, and fix the conduit 2 on the steel cage 1 by binding with the fixing wire 3. During the binding and fixing process, the conduit 2 is positioned by measuring with a tape measure so that the conduit 2 is at the center of the steel cage 1;

[0030] Step 3: Pile foundation hole 6;

[0031] Step 4: lower the steel cage 1 obtained in step 2 into the pile foundation hole 6;

[0032] Step 5: After connecting the ultrasonic detector 5 to the active line 4, the ultrasonic detector 5 is slowly moved from the catheter 2 to the bottom of the pile foundation hole 6 until it moves to the bottom of the pile foundation hole 6; wherein, during the movement process, the ultrasonic detector 5 transmits the detected data information to the terminal device through the DTU device, and the terminal device draws a position image of the steel cage 1 in the pile foundation hole 6 according to the received data information.

[0033] Among them, in the present invention, the position image imaging principle is as follows:

[0034] The ultrasonic detector 5 passes downward through the catheter 2, emits an ultrasonic wave, hits the wall of the pile foundation hole 6 and rebounds. The time from the ultrasonic wave emission to the rebound is △t, and the distance X from the ultrasonic detector 5 to the wall of the pile foundation hole 6 can be measured. i , Wherein, v is the speed of sound 340m / s. Since the ultrasonic detector 5 detects the four directions of the pile foundation hole 6, i = 1, 2, 3, 4. For details, see Figure 3 .

[0035] The data X measured by the ultrasonic detector 5 i The wall of the pile foundation hole 6 can be drawn. Since it is known that the ultrasonic detector 5 is downward through the catheter 2, the catheter 2 is always in the center of the steel cage 1, and the radius r of the steel cage 1 is known, the specific position of the steel cage 1 in the pile foundation hole 6 can be drawn. The result is as follows Figure 4 shown.

[0036] It should be noted that the present invention can detect the pattern of the wall of the pile foundation hole 6 while positioning and detecting the steel cage 1, so as to further detect the thickness of the concrete protective layer in the pile foundation, the hole diameter of the pile foundation hole 6 and the verticality of the wall of the pile foundation hole 6.

[0037] In this article, a DTU device is a wireless terminal device specifically used to convert serial port data into IP data or convert IP data into serial port data for transmission via a wireless communication network.

[0038] The above description is a detailed description of the preferred feasible embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modified changes completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A method for locating a pile foundation reinforcement cage, characterized in that: A positioning device for locating the position of the pile foundation steel cage is used for positioning, the positioning device includes a catheter, a fixed line, a movable line, an ultrasonic detector, a DTU device and a terminal device, the catheter is sequentially provided with a plurality of fixed lines along its length direction, the catheter is fixed inside the steel cage by the fixed lines, the catheter extends from the upper end to the bottom end of the steel cage, the central axis of the catheter coincides with the central axis of the steel cage, the catheter is a hollow structure, the ultrasonic detector is movably arranged inside the catheter, and is connected to the movable line, the ultrasonic detector moves in the catheter under the traction of the movable line, the DTU device is installed on the ultrasonic detector, and the ultrasonic detector is wirelessly connected to the terminal device through the DTU device; The positioning method comprises the following steps: Step 1: making the catheter; Step 2: Insert the conduit into the steel cage and fix the conduit on the steel cage by binding with a fixing wire. During the binding and fixing process, use a tape measure to position the conduit so that the conduit is at the center of the steel cage. Step 3: Driving pile foundation holes; Step 4: lower the steel cage obtained in step 2 into the pile foundation hole; Step 5: After connecting the ultrasonic detector to the active line, move the ultrasonic detector slowly from the catheter to the bottom of the pile foundation hole until it reaches the bottom of the pile foundation hole; during the movement, the ultrasonic detector transmits the detected data information to the terminal device through the DTU device, and the terminal device draws the position image of the steel cage in the pile foundation hole according to the received data information.

2. A method for locating a pile foundation reinforcement cage according to claim 1, characterized in that: The conduit is a tubular structure formed by crisscrossing and bundling, and is made of steel bars or alloys.

3. A method for locating the position of a pile foundation reinforcement cage according to claim 2, characterized in that: The hollow area of ​​the conduit is equal to 10-15 times the bundling area.

4. A method for locating a pile foundation reinforcement cage according to claim 1, characterized in that: Three fixing wires are evenly arranged at the same height of the catheter.

5. A method for locating a pile foundation reinforcement cage according to claim 4, characterized in that: The fixed lines at two adjacent heights on the conduit are 0.5-1m apart.

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