Device for controlling burying depth of guide pipe in pouring process of cast-in-place pile

Abstract

The utility model relates to the technical field of cast-in-place pile construction, in particular to a device for controlling the buried depth of a guide pipe in the cast-in-place pile pouring process. The length of the guide pipe is calculated by monitoring the height of the hook head of the crane and the height of the concrete pouring surface, so that the bottom of the guide pipe is controlled to be buried 2-6 m below the concrete pouring surface. Wherein the crane hook head height monitoring needs to install a distance sensor on a winch, the concrete pouring surface height is digitally monitored in real time by adopting the device and the concrete pouring surface monitoring system disclosed by the utility model in the construction scheme, and the length of the guide pipe is calculated according to the mark number of each section of guide pipe. The pipe embedding depth in the pouring process of the cast-in-place pile can be effectively controlled, and the situation that the pipe is pulled out of a concrete pouring face due to manual operation errors or calculation errors, the cast-in-place pile is broken, and quality accidents are caused is avoided. Therefore, the embedding depth of the guide pipe is accurately monitored in real time, the construction quality in the pouring process of the cast-in-place pile is improved, and the overall construction quality of the cast-in-place pile is controlled.

Description

Technical Field

[0001] This utility model relates to the field of cast-in-place pile construction technology, and in particular to a device for controlling the burial depth of the guide pipe during the casting process of cast-in-place piles. Background Technology

[0002] Cast-in-place piles are a commonly used type of pile foundation in engineering construction. Due to their high bearing capacity and adaptability to various geological conditions, they are widely used in projects. However, the construction of cast-in-place piles involves many steps, and each step must meet quality requirements to ensure the overall construction quality. Among these steps, concrete pouring often becomes a key point in quality control. For example, if the volume of the first pour does not meet the specifications, the distance between the tremie pipe and the bottom of the hole is too large or too small, the pouring is discontinuous due to other reasons, the tremie pipe's embedment depth does not meet the requirements, or the tremie pipe is pulled out of the concrete pouring surface, all of these will affect the quality of the cast-in-place pile. In particular, the tremie pipe embedment depth is a control indicator that runs through the entire process of cast-in-place pile pouring. Once the tremie pipe is pulled out of the concrete pouring surface, it will cause the pile to break, which is irreparable. Therefore, this step is the most critical link in the quality control of cast-in-place pile construction.

[0003] In current construction, the method for controlling the tremie pipe embedment depth is to measure the distance from the concrete surface to the ground by connecting a weighted iron piece to a measuring rope, and then recording the changes in the pipe length during construction. The embedment depth is determined by calculating these two sets of data. The problem with this method is that the measurement of the concrete surface position using the weighted iron piece is inaccurate. Since the concrete at the top of the pile is often mixed with mud, the weight and shape of the iron piece will affect the measurement data. Furthermore, because the tremie pipe embedment depth is calculated by recording the changes in pipe length and the concrete surface position, and each section of the tremie pipe is only 3m long, while pile foundations typically have many sections, the pipe length changes as the concrete rises. This makes it easy to record errors in the number of tremie pipe sections, leading to embedment depths that do not meet design requirements and resulting in quality problems. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by providing a device for controlling the embedment depth of the guide pipe during the pouring of cast-in-place piles.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a device for controlling the embedment depth of the guide pipe during the pouring of cast-in-place piles, characterized in that it includes a distance sensor, a Beidou satellite positioning system, and a concrete pouring surface monitoring device; the distance sensor is connected to the winch of the lifting equipment; the Beidou satellite positioning system is connected to the top of the lifting arm of the lifting equipment; the concrete pouring surface monitoring device includes height sensors with a certain density, a transmission line, and a digital platform; the height sensor is placed inside the cast-in-place pile together with the guide pipe during the concrete pouring process; the Beidou satellite positioning system and the distance sensor are connected to the digital platform via wireless signals, and the height sensor is connected to the digital platform via the transmission line.

[0006] Before the concrete is poured into the cast-in-place pile, the number of pipe sections and the length of each section are determined according to the length of the cast-in-place pile. Marks are made on every few pipe sections from top to bottom. The marks include the length of a single pipe section, the pipe section number, and the total length of the pipe sections.

[0007] After the guide tube is assembled, a pressure test is conducted on the guide tube, wherein the test pressure is not less than 1.3 times the water depth pressure in the hole.

[0008] The height sensor has a spherical structure and a relative density of 2.25.

[0009] This invention controls the bottom of the guide pipe to be buried 2-6m below the concrete pouring surface by monitoring the height of the crane hook and the height of the concrete pouring surface. The crane hook height monitoring requires a distance sensor installed on the winch. The concrete pouring surface height is digitally monitored in real time using the concrete pouring surface monitoring system described in this invention and construction plan. The guide pipe length is calculated based on the numbering of each section.

[0010] This invention can effectively control the embedment depth of the guide pipe during the pouring of cast-in-place piles, preventing the guide pipe from being pulled out of the concrete pouring surface due to human error or calculation mistakes, thus avoiding pile breakage and quality accidents. It allows for real-time and accurate monitoring of the guide pipe embedment depth, improving the construction quality during the pouring process and ensuring that the overall construction quality of the cast-in-place piles is under control. Attached Figure Description

[0011] Figure 1 This is a construction diagram of the present invention;

[0012] In the diagram: 1. Beidou satellite positioning system; 2. Distance sensor; 3. Lifting equipment; 4. Hook; 5. Transmission line; 6. Digital platform; 7. Height sensor; 8. Conduit; 9. Cast-in-place pile. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the specific embodiments.

[0014] Example 1

[0015] A device for controlling the embedment depth of a guide pipe during the pouring of a cast-in-place pile includes a distance sensor 2, a Beidou satellite positioning system 1, and a concrete pouring surface monitoring device. The distance sensor 2 is connected to the winch of a lifting device 3. The Beidou satellite positioning system 1 is connected to the top of the lifting arm of the lifting device 3. The concrete pouring surface monitoring device includes height sensors 7 with a certain density, a transmission line 5, and a digital platform 6. The height sensors 7 are placed inside the cast-in-place pile 9 together with the guide pipe 8 during the concrete pouring process. The Beidou satellite positioning system 1 and the distance sensor 2 are connected to the digital platform 6 via wireless signals, and the height sensors 7 are connected to the digital platform 6 via the transmission line 5.

[0016] Before the concrete is poured into the cast-in-place pile 9, the number of pipe sections and the length of each section are determined according to the length of the cast-in-place pile 9. Marks are made on every few pipe sections from top to bottom. The marks include the length of a single pipe section, the pipe section number, and the total length of the pipe sections.

[0017] After the conduit 8 is assembled, a pressure test is conducted on the conduit 8, wherein the test pressure is not less than 1.3 times the water depth pressure inside the hole.

[0018] The height sensor 7 has a spherical structure and a relative density of 2.25.

[0019] Example 2

[0020] The construction method for controlling the embedment depth of the guide pipe during the casting of cast-in-place piles using the device described in Example 1 includes the following steps:

[0021] Step 1: Select construction equipment and carry out borehole construction based on geological characteristics.

[0022] Select appropriate pile drilling equipment based on different geological characteristics, including impact drilling rigs, forward and reverse circulation drilling rigs, rotary drilling rigs, and specialized equipment such as grab drilling rigs. After the construction equipment is completed, pile drilling construction can begin.

[0023] Step 2: Lowering the reinforcing cage for the cast-in-place piles according to the construction procedures.

[0024] After the bored pile hole is formed, a first cleaning is performed. For end-bearing bored piles, the sediment thickness should not exceed 5cm, and for friction piles, it should not exceed 10cm. Only after passing inspection can the next reinforcement cage construction proceed. Based on the length of the bored pile, the reinforcement cage is fabricated and installed section by section, using mechanical connections between sections. Attention is paid to the quality, quantity, and location of the spacers. Simultaneously, the installation and connection of the sonic logging pipes are carefully managed to avoid damage during construction and affecting pile foundation testing. After the reinforcement cage is lowered, a second cleaning is performed based on the sediment condition at the bottom of the hole. Only after meeting the design specifications can the next construction step proceed.

[0025] Step 3: Perform trial assembly and pressure test of the catheter, and assign numbers accordingly.

[0026] Before pouring concrete for the cast-in-place pile 9, the number of pipe sections and the length of each section need to be determined according to the length of the cast-in-place pile 9. Mark each pipe section from top to bottom, including the length of a single pipe section, the pipe section number, and the total length of the pipe section. Then, the guide pipe 8 is trial-assembled and pressure-tested, and the test pressure is not less than 1.3 times the water depth pressure in the hole.

[0027] Step 4: Install distance sensor 2 on the winch of lifting equipment 3.

[0028] After the guide pipe 8 is marked and tested, a distance sensor 2 is installed on the winch of the lifting equipment 3, and a Beidou satellite positioning system 1 is installed at the top of the lifting arm of the lifting equipment 3. Since the lifting equipment is needed to lift the guide pipe 8 during the concrete pouring process of the cast-in-place pile 9, the distance sensor 2 on the winch can effectively measure the height H1 of the hook 4, and the Beidou satellite positioning system 1 can display the distance H2 from the top of the lifting arm to the ground.

[0029] Step 5: Prepare monitoring equipment for the concrete pouring surface

[0030] The concrete pouring surface monitoring equipment consists of three parts: a height sensor 7 with a certain density, a transmission line 5, and a digital platform 6. The height sensor 7 has a spherical structure and operates by controlling its own relative density to be 2.25. During concrete pouring, it is placed inside the cast-in-place pile 9. Since the relative density of concrete is between 2.35 and 2.4, and the relative density of the concrete-slurry interface varies widely depending on the soil type (between 1.6 and 2.1), while the relative density of the slurry does not exceed 1.45, this ensures that the height sensor 7 remains at the top of the concrete during pouring, accurately monitoring the concrete top surface elevation. Simultaneously, the data is transmitted to the digital platform 6 via the transmission line 5.

[0031] Step 6: Pour concrete and control the depth of the guide pipe installation.

[0032] After the height sensor 7 is installed, concrete is poured. The concrete is transported to the site by a concrete mixer truck and poured into the guide pipe 8 using a self-unloading method. A crane lifts the guide pipe 8 according to the concrete pouring progress. Based on the monitored distance H3 between the concrete pouring surface and the ground, the height H1 of the hoist hook 4, the distance H2 from the highest point of the hoisting equipment 3 to the ground, and the length H4 of the guide pipe 8, the embedment depth H of the guide pipe 8 can be calculated. In the above data, H1 and H2 are transmitted wirelessly to the digital platform, while H3 is connected to the digital platform via the sensor's transmission line. The embedment depth H is automatically calculated by manually inputting the length of the guide pipe 8. H = H1 + H4 - (H2 + H3). According to design specifications, H is controlled within 2-6m. Guide pipe sections are disassembled promptly until the concrete pouring of the cast-in-place pile is completed.

[0033] Step 7: After the cast-in-place piles are poured, conduct ultrasonic testing of the pile foundation.

[0034] After the cast-in-place pile 9 has been poured and reached the required curing age, ultrasonic testing is conducted to verify whether the integrity of the pile foundation meets the design specifications.

Claims

1. A device for controlling the embedment depth of the guide pipe during the pouring of cast-in-place piles, characterized in that, The system includes a distance sensor, a BeiDou satellite positioning system, and a concrete pouring surface monitoring device. The distance sensor is connected to the winch of the lifting equipment. The BeiDou satellite positioning system is connected to the top of the lifting arm of the lifting equipment. The concrete pouring surface monitoring device includes height sensors with a certain density, a transmission line, and a digital platform. The height sensor is placed inside the cast-in-place pile along with the guide pipe during the concrete pouring process. The BeiDou satellite positioning system and the distance sensor are connected to the digital platform via wireless signals, and the height sensor is connected to the digital platform via the transmission line.

2. The device for controlling the embedment depth of the guide pipe during the casting of a cast-in-place pile according to claim 1, characterized in that, Before the concrete is poured into the cast-in-place pile, the number of pipe sections and the length of each section are determined according to the length of the cast-in-place pile. Marks are made on every few pipe sections from top to bottom. The marks include the length of a single pipe section, the pipe section number, and the total length of the pipe sections.

3. A device for controlling the embedment depth of the guide pipe during the casting of a cast-in-place pile according to claim 1 or 2, characterized in that, After the guide tube is assembled, a pressure test is conducted on the guide tube, wherein the test pressure is not less than 1.3 times the water depth pressure in the hole.

4. The device for controlling the embedment depth of the guide pipe during the casting of a cast-in-place pile according to claim 1, characterized in that, The height sensor has a spherical structure and a relative density of 2.25.

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