A measuring tool and method for cast-in-place pile sediment thickness

Abstract

The present invention provides a tool and method for measuring the thickness of cast-in-place pile sediment, belonging to the field of building foundation construction. The tool comprises a main body, a first suspension member, and a second suspension member. The first suspension member has one end disposed on one side of the main body, and the other end of the first suspension member has a first suspension position; the second suspension member has one end disposed on the other side of the main body, and the other end of the second suspension member has a second suspension position. The present invention has the beneficial effects of reducing the technical and experience difficulty of measuring the interface between mud and sediment, ensuring the acceptance of sediment thickness by supervisory units and construction units, and ensuring the quality of cast-in-place pile construction.

Description

Technical Field

[0001] The invention belongs to the field of building foundation construction, and in particular relates to a measuring tool and a measuring method for the thickness of cast-in-place pile sediment. Background Art

[0002] The thickness of the sediment at the bottom of a slurry-wall bored pile has a crucial impact on its bearing capacity. Test data show that the pile's bearing capacity varies with the thickness of the sediment. When the sediment thickness exceeds a certain value, the ultimate resistance Qp at the pile tip is determined by the sediment properties, regardless of the soil quality of the bearing layer.

[0003] To this end, current construction acceptance standards have set higher requirements for the thickness of bottom sediment in bored cast-in-place piles. GB50202-2018 stipulates that the maximum allowable bottom sediment thickness for bored cast-in-place piles is: ≤50mm for end-bearing piles; ≤150mm for friction piles. Therefore, reducing the bottom sediment thickness and keeping it within a certain range requires accurate measurement of the sediment thickness for bored cast-in-place piles.

[0004] Excessive sediment thickness in bored piles will cause significant settlement when loaded, reducing the pile's bearing capacity and impacting the building's quality and inherent safety. Therefore, sediment thickness inspection for bored piles is a key task in construction control. Sediment thickness testing is a crucial aspect of acceptance inspections by supervisors and construction contractors. However, because sediment thickness measurement requires both physical effort and experience, and the working surface is often muddy, it's typically performed by drillers, who report the measured sediment thickness to inspectors. Inspectors, unfamiliar with the procedure, generally don't perform sediment thickness inspections.

[0005] In the past, the tools for measuring sediment thickness were measuring ropes and hammers. The hammers were generally thicker steel bars of 300-400mm and weighed 3.5-4KG. When the hammer began to enter the sediment, the surveyor could not feel it. When most of the hammer had entered the sediment, the surveyor began to feel the change in output. Therefore, even experienced surveyors had difficulty in grasping the interface between mud and sediment. The sediment thickness measured with this tool was generally 200-300mm smaller.

[0006] There are generally two methods for measuring sediment thickness. The first is the weight method, which involves the following steps: 1. Measure the elevation of the steel casing with a measuring instrument; 2. Calculate the total length of the rotating rod inserted into the casing; 3. Hang a weight of approximately 0.5 kg from the zero point of the measuring rope; 4. Slowly lower the measuring rope into the pile hole. Once the weight reaches the top of the sediment, manually heave it up and down several times to ensure it has bottomed out. 5. Subtract the rope gauge reading from the total length of the rotating rod inserted into the casing, plus the height of the weight, to obtain the sediment thickness. Because the weight measurement depth is below the interface between the mud and sediment, this method underestimates the sediment thickness.

[0007] The second method, the cone and disc method, involves the following steps: 1. Attach a 1kg cone to the zero-point end of a measuring line. 2. Slowly lower the measuring line into the pile hole. Once the cone reaches the bottom, manually heave it up and down a few times to ensure it's firmly in place. 3. Attach a 1kg disc to the zero-point end of another measuring line. 4. Slowly lower the measuring line into the pile hole. Once the disc reaches the top of the sediment, manually heave it up and down a few times to ensure it's firmly in place. 5. The difference between the cone and disc readings represents the sediment thickness. Due to the small weight of the cone, the cone reading is likely to be lower, which in turn results in a lower sediment thickness measurement.

[0008] Therefore, how to measure the interface between mud and sediment (sediment thickness) has become a major problem that needs to be solved urgently. Summary of the Invention

[0009] The purpose of the present invention is to solve the problems in the background technology and provide a measuring tool and method for the thickness of cast-in-place pile sediment.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: a tool for measuring the thickness of cast-in-place pile sediment, comprising a main body, a first suspension member and a second suspension member, wherein:

[0011] One end of the first suspension member is arranged on one side of the body, and the other end of the first suspension member is provided with a first suspension position;

[0012] One end of the second suspension member is arranged on the other side of the body, and the other end of the second suspension member is provided with a second suspension position.

[0013] Preferably, the body is configured as a circular ring structure.

[0014] Preferably, the first suspension members are provided in plurality, one end of each of the plurality of first suspension members is fixedly connected to the body, and the plurality of first suspension members are evenly distributed along the circumference of the body;

[0015] The other ends of the plurality of first suspension members are fixedly connected to form a first node, and the first suspension position is fixedly arranged at the first node.

[0016] Preferably, the second suspension member comprises a first suspension rod and a second suspension rod, wherein:

[0017] The first suspension rods are provided in plurality, one end of each of the plurality of first suspension rods is fixedly connected to the body and is evenly distributed along the circumference of the body;

[0018] The other ends of the plurality of first suspension rods are fixedly connected to form a second node. One end of the second suspension rod is fixedly arranged at the second node. The other end of the second suspension rod is provided with a second suspension position.

[0019] Preferably, the first suspension member is configured as a flexible structure, and the second suspension member is configured as a rigid structure.

[0020] Preferably, the first suspension member is configured as a chain, and the first suspension rod and the second suspension rod are both configured as rods.

[0021] Preferably, galvanized nuts are provided at both the first hanging position and the second hanging position.

[0022] Preferably, the main body, the first suspension member and the second suspension member are all made of galvanized metal parts.

[0023] A method for measuring the thickness of cast-in-place pile sediment, using the above-mentioned cast-in-place pile sediment thickness measuring tool, comprises the following steps:

[0024] S1: Slowly lower the measuring rope with the bored pile sediment measuring tool into the pile hole. When the bored pile sediment measuring tool reaches the interface between the mud and sediment, the interface between the mud and sediment is accurately determined by the changes in the force on the measuring rope and the changes in the descent speed, and the measuring rope value is read.

[0025] S2: Hold the measuring rope steady so that it does not swing left or right or drop. After 2 minutes, slowly guide the measuring rope into the pile hole. When the measuring rope is no longer under stress and the measuring tool stops dropping, it is determined to be at the pile bottom. At this time, lift the measuring tool up and down several times to ensure that it has reached the pile bottom, and read the measuring rope value.

[0026] S3: When the sediment thickness is smaller than the sediment measuring tool, hang the measuring tool on the safety hook and slowly lower the measuring rope into the pile hole. When the force on the measuring rope becomes significantly smaller and the descending speed of the measuring tool decreases significantly, it is judged as the interface between the mud and the sediment. At this time, weigh it up and down several times by hand to ensure accurate determination of the interface between the mud and the sediment, and read the value of the measuring rope.

[0027] The advantages and positive effects of the present invention are: due to the adoption of the above technical solution, the measurement method is simple and convenient, and the measured value is accurate; the technical and experience difficulties of measuring the interface between mud and sediment are reduced; the acceptance work of sediment thickness by the supervision unit and the construction unit is implemented, and the construction quality of the bored pile is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of the tool for measuring the thickness of cast-in-place pile sediment of the present invention;

[0029] Figure 2 Schematic diagram of the planar structure of the tool for measuring the thickness of cast-in-place pile sediment of the present invention;

[0030] Figure 3 Schematic diagram of the elevation structure of the tool for measuring the thickness of cast-in-place pile sediments of the present invention;

[0031] Figure 4 It is a structural diagram for measuring the interface between mud and sediment;

[0032] Figure 5 It is a structural diagram when measuring the pile bottom;

[0033] Figure 6 It is a schematic diagram of the structure when the sediment thickness is smaller than the sediment measuring tool.

[0034] In the picture:

[0035] 1. Main body 3. First suspension part 2. First suspension position

[0036] 4. First suspension rod 5, second suspension rod 6, second suspension position DETAILED DESCRIPTION

[0037] This embodiment provides a tool for measuring the thickness of cast-in-place pile sediment. Figure 1 It is a structural diagram of this embodiment, as shown in FIG. Figure 1 As shown, it includes a body 1, a first suspension member 3 and a second suspension member, wherein:

[0038] One end of the first suspension member 3 is arranged on one side of the main body 1, and the other end of the first suspension member 3 is provided with a first suspension position 2; one end of the second suspension member is arranged on the other side of the main body 1, and the other end of the second suspension member is provided with a second suspension position 6, providing a mud and sediment interface measurement tool, which can simply, conveniently and accurately measure the interface between mud and sediment, measure the sediment thickness, reduce the technical and experience difficulty of measuring the mud and sediment interface; implement the acceptance work of the sediment thickness of the supervision unit and the construction unit, and ensure the construction quality of the bored pile.

[0039] As an optional embodiment, Figure 2 Schematic diagram of the plane structure of this embodiment, as shown in FIG. Figure 2 As shown, the main body 1 is configured as a circular ring structure. In this embodiment, the main body 1 is a 6 mm thick galvanized metal ring with an outer diameter of 200 mm and an inner diameter of 100 mm. It can be manufactured by water welding cutting and grinding with a grinding wheel.

[0040] As an optional embodiment, Figure 3 It is a elevation view of this embodiment, as shown in FIG. Figure 3 As shown, a plurality of first suspension members 3 are provided, one end of each of the plurality of first suspension members 3 is fixedly connected to the body 1, and the plurality of first suspension members 3 are evenly distributed along the circumference of the body 1. In this embodiment, three first suspension members 1 are provided, and the plurality of first suspension members 3 are evenly distributed along the circumference of the body 1.

[0041] The other ends of the plurality of first suspension members 3 are fixedly connected to form a first node, and the first suspension position 2 is fixedly arranged at the first node;

[0042] Specifically, the first suspension member 1 is configured as a flexible structure. In this embodiment, the first suspension member 1 is configured as a chain. Preferably, the first suspension member 1 is a galvanized metal chain, which can be obtained by purchasing galvanized metal chains on the market.

[0043] As an optional embodiment, the second suspension member includes a first suspension rod 4 and a second suspension rod 5, wherein:

[0044] There are multiple first suspension rods 4, one end of each of which is fixedly connected to the body 1 and evenly distributed along the circumference of the body 1. In this embodiment, there are three first suspension rods 4.

[0045] The other ends of the plurality of first suspension rods 4 are fixedly connected to form a second node. One end of the second suspension rod 5 is fixedly arranged at the second node. The other end of the second suspension rod 5 is provided with a second suspension position 6.

[0046] Specifically, the second suspension member is configured as a rigid body structure. Preferably, the first suspension rod 4 and the second suspension rod 5 are both configured as rods. In this embodiment, the first suspension rod 4 is a galvanized rod with a diameter of 20 mm and a length of 230 mm, which is cut by a grinding wheel cutter. The second suspension rod 5 is a galvanized rod with a diameter of 18 mm and a length of 50 mm, which is cut by a grinding wheel cutter.

[0047] As an optional implementation, galvanized nuts are provided at both the first hanging position 2 and the second hanging position 6, and carbon dioxide shielded welding is adopted between the various components.

[0048] A method for measuring the thickness of cast-in-place pile sediment, using the above-mentioned cast-in-place pile sediment thickness measuring tool, comprises the following steps:

[0049] S1: Figure 4 This is a structural diagram for measuring the interface between mud and sediment. Figure 4As shown, the measuring rope with the bored pile sediment measuring tool is slowly lowered into the pile hole. When the bored pile sediment measuring tool reaches the interface between the mud and the sediment, the interface between the mud and the sediment is accurately determined by the change in the force on the measuring rope and the change in the falling speed, and the measuring rope value is read.

[0050] Specifically, when measuring sediment thickness in mud-walled bored piles, the hole mouth should be cleaned of debris and mud, and the pile hole should be covered with a grid to ensure the safety of the inspector. The measuring tool weighs 3.7 kg. Measure the height of the "sediment thickness measuring tool" in advance, attach a safety hook to the zero-point end of the measuring rope, and hang the measuring tool from the safety hook at the first hanging position 2. Slowly lower the measuring rope into the pile hole. When the force on the measuring rope decreases significantly and the tool's descent speed decreases significantly, the interface between the mud and sediment can be determined. At this point, manually weigh the tool up and down several times to ensure the accurate determination of the interface between the mud and sediment, and then read the reading from the measuring rope.

[0051] S2: Figure 5 It is a structural diagram of pile bottom measurement, such as Figure 5 As shown, hold the measuring rope steady so that it does not swing left or right or drop. After 2 minutes, slowly guide the measuring rope into the pile hole. When the measuring rope is no longer under stress and the measuring tool no longer drops, it can be determined that the pile has bottomed out. At this point, lift the measuring tool up and down several times to ensure that it has reached the pile bottom, and read the value on the measuring rope.

[0052] S3: Figure 6 This is a schematic diagram of the structure when the sediment thickness is smaller than the sediment measuring tool, such as Figure 6 As shown, when the sediment thickness is smaller than the sediment measuring tool, hang the measuring tool on the safety hook and slowly lower the measuring rope into the pile hole. When the force on the measuring rope becomes significantly smaller and the descending speed of the measuring tool decreases significantly, it can be determined as the interface between the mud and the sediment. At this time, weigh it up and down several times with your hands to ensure accurate determination of the interface between the mud and the sediment, and read the value of the measuring rope.

[0053] The sediment thickness is obtained by subtracting the reading of the measuring rope at the "interface between mud and sediment" from the reading of the measuring rope at the bottom of the pile.

[0054] The beneficial effects of the present invention are:

[0055] 1. Provide a mud and sediment interface measurement tool;

[0056] 2. Reduce the technical and experience difficulty of measuring the interface between mud and sediment;

[0057] 3. Implement the acceptance work of sediment thickness by the supervision unit and the construction unit.

[0058] 4. Ensure the quality of bored pile construction.

[0059] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A tool for measuring the thickness of cast-in-place pile sediment, characterized by: It comprises a body, a first suspension member and a second suspension member, wherein: One end of the first suspension member is arranged on one side of the body, and the other end of the first suspension member is provided with a first suspension position; One end of the second suspension member is arranged on the other side of the body, and the other end of the second suspension member is provided with a second suspension position; The body is configured as a circular ring structure, and a plurality of first suspension members are provided, one end of each of the plurality of first suspension members is fixedly connected to the body and is evenly distributed along the circumference of the body; the other ends of the plurality of first suspension members are fixedly connected to form a first node, and the first suspension position is fixedly configured at the first node; The second suspension member includes a first suspension rod and a second suspension rod, wherein the first suspension rod is provided in plurality, one end of each of the plurality of first suspension rods is fixedly connected to the main body and is evenly distributed along the circumference of the main body; the other ends of the plurality of first suspension rods are fixedly connected to form a second node, one end of the second suspension rod is fixedly provided at the second node, and the other end of the second suspension rod is provided with a second suspension position.

2. The tool for measuring the thickness of cast-in-place pile sediment according to claim 1, characterized in that: The first suspension member is configured as a flexible structure, and the second suspension member is configured as a rigid structure.

3. The tool for measuring the thickness of cast-in-place pile sediment according to claim 2, characterized in that: The first suspension member is configured as a chain, and the first suspension rod and the second suspension rod are both configured as rods.

4. The tool for measuring the thickness of cast-in-place pile sediment according to claim 1, characterized in that: Galvanized nuts are provided at both the first hanging position and the second hanging position.

5. The tool for measuring the thickness of cast-in-place pile sediment according to claim 1, characterized in that: The main body, the first suspension member and the second suspension member are all made of galvanized metal parts.

6. A method for measuring the thickness of cast-in-place pile sediment, characterized by: The method of measuring the thickness of cast-in-place pile sediment according to any one of claims 1 to 5 comprises the following steps: S1: Slowly lower the measuring rope with the bored pile sediment measuring tool into the pile hole. When the bored pile sediment measuring tool reaches the interface between the mud and sediment, the interface between the mud and sediment is accurately determined by the changes in the force on the measuring rope and the changes in the descent speed, and the measuring rope value is read. S2: Hold the measuring rope steady so that it does not swing left or right or drop. After 2 minutes, slowly guide the measuring rope into the pile hole. When the measuring rope is no longer under stress and the measuring tool stops dropping, it is determined to be at the pile bottom. At this time, lift the measuring tool up and down several times to ensure that it has reached the pile bottom, and read the measuring rope value. S3: When the sediment thickness is smaller than the sediment measuring tool, hang the measuring tool on the safety hook and slowly lower the measuring rope into the pile hole. When the force on the measuring rope becomes significantly smaller and the descending speed of the measuring tool decreases significantly, it is judged as the interface between the mud and the sediment. At this time, weigh it up and down several times by hand to ensure accurate determination of the interface between the mud and the sediment, and read the value of the measuring rope.

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