Portable cast-in-place pile sediment detection tool

Abstract

The utility model discloses a portable cast-in-place pile sediment detection tool. The portable cast-in-place pile sediment detection tool comprises a detection rope, a T-shaped reinforcing steel bar part, a circular steel plate and a fixed clamping ring, a measuring rope is fixed to the center of the top of the T-shaped steel bar piece, and the lower end of the T-shaped steel bar piece is a conical tip. A positioning hole allowing the lower end of the T-shaped steel bar part to penetrate through is formed in the center position of the circular steel plate, and the lower end of the T-shaped steel bar part can move up and down relative to the circular steel plate along the center line of the positioning hole; the upper end face of the circular steel plate is provided with a plurality of connecting lines with the same length, the connecting lines are evenly distributed around the positioning hole and fixed to the measuring rope through fixing clamping rings, and the intersection points of the measuring rope and the connecting lines are located on the vertical center line of the circular steel plate. The T-shaped steel bar part is used for replacing a heavy punch on a traditional measuring rope, on-site manufacturing can be carried out, construction convenience and measuring accuracy are improved, the T-shaped steel bar part type measuring rope has the advantages of being low in cost, high in practicability and high in accuracy, and the purposes of facilitating measurement and reducing errors are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pile foundation engineering construction, and in particular relates to a convenient cast-in-place pile sediment detection tool. Background Art

[0002] During the construction of pile foundation projects, the hole must be cleaned and the secondary hole cleaned process must be carried out before pouring concrete for bored piles to ensure that the thickness of the sediment at the bottom meets the requirements of the specifications. In the "Code for Acceptance of Construction Quality of Building Foundation Engineering GB50202-2018" and the "Technical Specifications for Building Pile Foundations JGJ94-2008", when the borehole reaches the designed depth and before pouring concrete, the sediment thickness index at the bottom of the hole should meet the following requirements: The sediment thickness at the end bearing pile is ≤50mm, and the sediment thickness at the friction pile is ≤100mm, and it is measured using a sediment meter or a heavy hammer.

[0003] At present, measuring ropes are commonly used for sediment detection at construction sites. They are convenient and flexible. However, when using measuring ropes, the height of the weight falling depends entirely on the subjective perception of the inspectors, which is relatively random and may have certain errors and is not very intuitive.

[0004] After searching, the existing Chinese utility model application document with announcement number CN209907449U discloses a device for detecting the sediment thickness at the bottom of a bored pile hole, "including a base frame erected above the pile hole, a fixed pulley is provided on the base frame, a measuring rope is wound on the fixed pulley, a weight is provided at one end of the measuring rope, and a counterweight block is connected to the other end, the weight of the counterweight block is less than the weight, a laser indicator is embedded in the counterweight block, and the base frame is connected to a vertical observation plate through a connecting rod, the observation plate is opposite to the laser indicator and scale lines are provided on the observation plate". Although the device improves the accuracy of sediment thickness detection, the device adopts complex structures such as laser indicators, has high manufacturing costs, and requires operators to have certain usage and observation experience, which increases the time cost and labor cost of training, and has certain limitations.

[0005] Therefore, there is an urgent need to study a detection device that is both convenient and can provide certain data support. Utility Model Content

[0006] In order to solve the problems existing in the prior art mentioned above, the purpose of the utility model is to provide a convenient cast-in-place pile sediment detection tool, which is modified based on the traditional measuring rope and can be manufactured on-site, which not only improves the convenience of construction and the accuracy of measurement, but also provides an effective solution for cast-in-place pile sediment detection through its low cost, high feasibility and high accuracy, achieves the purpose of facilitating measurement and reducing errors, and has good market application prospects and promotion value.

[0007] In order to achieve the above purpose and other related purposes, the utility model adopts the following technical solutions:

[0008] The utility model provides a convenient cast-in-place pile sediment detection tool, comprising a measuring rope, a T-shaped steel bar, a circular steel plate and a fixing clamp; a measuring rope is fixed on the top of the T-shaped steel bar, the measuring rope is fixed at the center position of the upper end of the T-shaped steel bar, and the lower end of the T-shaped steel bar is a conical tip; a positioning hole for the lower end of the T-shaped steel bar to pass through is opened at the center position of the circular steel plate, the T-shaped steel bar is movably connected with the circular steel plate through the positioning hole, so that the lower end of the T-shaped steel bar can move up and down along the center line of the positioning hole; a plurality of connecting lines are provided on the upper end surface of the circular steel plate, each connecting line is evenly distributed around the positioning hole, the connecting line is fixed to the measuring rope through a fixing clamp, the lengths of each connecting line are consistent, and the intersection of the measuring rope and each connecting line is located on the vertical center line of the circular steel plate.

[0009] As a preferred technical solution, the vertical length of the connecting line after being fixed on the measuring rope is greater than the vertical length of the T-shaped steel bar.

[0010] As a preferred technical solution, the upper end surface of the circular steel plate is further provided with a plurality of eyelets, which are circular and evenly distributed around the locating hole.

[0011] As a preferred technical solution, the outer surface of the T-shaped steel bar is coated with anti-rust paint.

[0012] As a further preferred technical solution, the number of the connecting wires is three, one ends of the three connecting wires are evenly distributed around the positioning hole, the lines connecting the fixed points of the three connecting wires on the circular steel plate form an equilateral triangle, and the other ends of the three connecting wires are fixedly connected to a point on the measuring rope through a fixed clamp.

[0013] As described above, the utility model has the following beneficial effects:

[0014] (1) The utility model is a convenient bored pile sediment detection tool. By using a T-shaped steel bar to replace the weight at the bottom of the traditional measuring rope, and providing a circular steel plate connected to the measuring rope, the T-shaped steel bar and the circular steel plate are connected in series, so that the specific sediment thickness measured is more intuitive, and the sediment thickness can be judged by forming intuitive data through the difference between the readings of the measuring rope after two sinkings, which effectively avoids the randomness of relying on personal perception and improves the construction convenience and measurement accuracy. In addition, by allowing multiple measurements and taking the average value, the accuracy and reliability of the measurement are further improved, the interference of human factors is reduced, and the consistency and accuracy of the sediment thickness measurement results are ensured.

[0015] (2) The utility model is a convenient bored pile sediment detection tool, which simplifies the manufacturing principle, enhances feasibility and reduces costs. In addition, the tool has a simple structure, is easy to manufacture and obtain materials, and is easy to construct, and has high economy and practicality in project engineering.

[0016] (3) The utility model is a convenient bored pile sediment detection tool, which shows good implementation effect in project engineering applications, and has good promotion ability due to its variability in type. Combined with the test results at a construction site of a project in Foshan, it proves the feasibility of the device and its ability to adapt to different construction environments and needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional elevation diagram of a convenient cast-in-place pile sediment detection tool of the utility model.

[0018] Figure 2 The utility model is Figure 1 Schematic diagram of the cross-sectional structure at AA in FIG.

[0019] Figure 3 It is a measurement schematic diagram of the utility model when taking the second reading.

[0020] Among them, the specific descriptions of the accompanying drawings are as follows: 101, measuring rope; 102, fixing clamp; 103, connecting line; 104, circular steel plate; 105, T-shaped steel bar; 106, sediment surface. DETAILED DESCRIPTION

[0021] In order to better understand the purpose, structure and function of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] In the description of the present invention, it should be noted that the positional relationships indicated by terms such as “longitudinal”, “lateral”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” cited in this specification are based on the positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] Example

[0024] like Figures 1 to 3As shown, this embodiment provides a convenient cast-in-place pile sediment detection tool, including a measuring rope 101, a T-shaped steel bar 105, a circular steel plate 104 and a fixing clamp 102. The measuring rope 101 is fixed on the top of the T-shaped steel bar 105, and the measuring rope 101 is fixed to the center position of the upper end of the T-shaped steel bar 105 through a steel bar pull ring. The lower end of the T-shaped steel bar 105 is a conical tip, and the outer surface of the T-shaped steel bar 105 is coated with anti-rust paint. A positioning hole is provided at the center of the circular steel plate 104 for the lower end of the T-shaped steel bar 105 to pass through. The T-shaped steel bar 105 is movably connected to the circular steel plate 104 through the positioning hole, so that the lower end of the T-shaped steel bar 105 can move up and down along the center line of the positioning hole; a plurality of connecting wires 103 are provided on the upper end surface of the circular steel plate 104, and each connecting wire 103 is evenly distributed around the positioning hole. The connecting wires 103 are fixed to the measuring rope 101 through a fixing clamp 102, and each connecting wire 103 has the same length. The intersection of the measuring rope 101 and each connecting wire 103 is located on the vertical center line of the circular steel plate 104, which ensures that the measuring rope 101 is always vertically downward during the detection process, and also ensures that the circular steel plate 104 is steadily lowered under the combined action of gravity and evenly distributed connecting wires 103 during the second reading. The lower end surface of the circular steel plate 104 is used to directly contact the sediment surface 106. The upper end surface of the circular steel plate 104 is also provided with a plurality of eyelets, which are circular and evenly distributed around the positioning hole, so as to reduce the weight of the circular steel plate 104 and maintain the center of gravity of the circular steel plate 104, thereby ensuring that the circular steel plate 104 can move down quickly and smoothly after contacting the sediment surface 106. Through the positioning hole, the connecting line 103 and the measuring rope 101, the T-shaped steel bar 105 and the circular steel plate 104 are connected in series to form a nested assembly, which can perform two readings during the measurement process.

[0025] In this embodiment, the T-shaped steel bar 105 is welded and fixed by mutually perpendicular C25 steel bar segments, the transverse length of the T-shaped steel bar 105 is 10 cm and the vertical length L is 15 cm; the measuring rope 101 is calibrated by inspection; the diameter of the circular steel plate 104 is 250 mm and the thickness is 5 mm, the diameter of the positioning hole is 50 mm, and the diameter of the eye is 25 mm; the number of the connecting wires 103 is three, one end of the three connecting wires 103 is evenly distributed around the positioning hole, and the three connecting wires 103 are fixed on the circular steel plate 104. The fixed point connection line is an equilateral triangle, and the other ends of the three connecting lines 103 are fixedly connected to a point on the measuring rope 101 through a fixing clamp 102, so that the connecting lines 103 and the measuring rope 101 are fixed to form a whole, and the intersection center of the three connecting lines 103 and the measuring rope 101 is perpendicular to the surface of the circular steel plate 104. The lengths of the connecting lines 103 are consistent and the vertical lengths of the connecting lines 103 after being fixed on the measuring rope 101 are greater than 15 cm, that is, the vertical lengths of the connecting lines 103 after being fixed on the measuring rope 101 are greater than the vertical length L of the T-shaped steel bar 105.

[0026] In actual work, the main construction steps include:

[0027] S1. Prepare a convenient cast-in-place pile sediment detection tool as described in Example 1:

[0028] S1-1. Select a measuring rope 101, a C25 steel bar segment, and a circular steel plate 104 with a diameter of 250 mm, which have been inspected and calibrated to meet the requirements;

[0029] S1-2, making T-shaped steel bar 105: weld and fix the C25 steel bar segment to form a T-shaped T-shaped steel bar 105, so that the horizontal length of the T-shaped steel bar 105 is 10cm and the vertical length L is 15cm, which can be determined according to the on-site operation test. The top of the lower end of the T-shaped steel bar 105 is processed into a conical tip, and anti-rust paint is applied to the outside of the completed T-shaped steel bar 105. The conical tip at the top of the lower end of the T-shaped steel bar 105 in this embodiment is formed by cutting. In other embodiments, other forms can also be used, such as welding and fixing the vertical conical tip on the vertical steel bar segment, and the central axis of the vertical steel bar segment coincides with the central axis of the conical head.

[0030] S1-3, the T-shaped steel bar 105 and the measuring rope 101 are fixedly connected: the fixing method can be a steel bar pull ring, which is first welded and fixed to the upper end surface of the T-shaped steel bar 105, and then the measuring rope 101 is fixed on the steel bar pull ring;

[0031] S1-4, processing the circular steel plate 104: opening a positioning hole with a diameter of 50 mm in the middle of the circular steel plate 104 with a diameter of 250 mm and a thickness of 5 mm, and evenly opening eyelets with a diameter of 25 mm around the positioning hole to facilitate subsequent sinking;

[0032] S1-5, such as Figure 1 As shown, a connecting line 103 is fixed on a circular steel plate 104, and a T-shaped steel bar 105 is assembled with the circular steel plate 104: an equilateral triangle is marked on the circular steel plate 104 with the center of the positioning hole on the circular steel plate 104 as the center of the equilateral triangle, and small holes are respectively opened at the three vertices of the equilateral triangle and fixed connecting lines 103 are passed through. The three connecting lines 103 must be of the same length and have strength, and can be made of the same material as the measuring rope 101. The vertical length of the connecting line 103 is greater than 15 cm;

[0033] like Figure 1 and Figure 2 As shown, the T-shaped steel bar 105 is connected to the circular steel plate 104 through the positioning hole. At the same time, the fixing clamp 102 is used to fix each connecting line 103 on the measuring rope 101 to ensure that when the center steel plate sinks during the measurement process, the measuring rope 101 is always subjected to a vertical downward force;

[0034] S2. Using the detection tool to measure sediment:

[0035] S2-1. Lower the assembled detection tool through the measuring rope 101, and take the first reading and record it when it sinks to the bottom of the pile: when the detection device is lowered, the T-shaped steel bar 105 and the circular steel plate 104 sink to the bottom of the pile at the same time. At this time, do not loosen the measuring rope 101 temporarily to keep the measuring rope 101 under stress, and record the reading data of the measuring rope 101 at this time as A;

[0036] S2-2, slowly loosen the measuring rope 101 for the first time, and take the second reading and record it when the circular steel plate 104 stops sinking: By slowly loosening the measuring rope 101, the circular steel plate 104 will continue to sink under the action of gravity, such as Figure 3 As shown, when the circular steel plate 104 stops sinking, the reading data of the measuring rope 101 at this time is immediately recorded as B;

[0037] S2-3. Calculate the difference between the two readings of the measuring rope 101 Δh=BA, and get the specific sediment thickness H=vertical length L of the T-shaped steel bar-the difference between the two readings Δh. Judge whether it is qualified by the obtained sediment thickness H. When the obtained sediment thickness H meets the requirements of the sediment thickness at the end bearing pile ≤50mm and the sediment thickness at the friction pile ≤100mm in the relevant specifications according to the type of the bored pile being tested, the purpose of the test can be achieved.

[0038] The measuring rope 101 is slowly loosened for the second time, and the position of the circular steel plate 104 is observed and re-tested. If the position of the circular steel plate 104 does not change when the measuring rope 101 is slowly loosened for the second time, it means that the current sediment thickness H has exceeded the vertical length L of the T-shaped steel bar 105, that is, the obtained sediment thickness H>L=15cm, which is much larger than the sediment thickness requirement in the relevant specifications, and can be directly judged as unqualified.

[0039] S3, retract the detection device, repeat step S2 to perform multiple tests and take an average value, thereby increasing the accuracy of the detection.

[0040] It should be noted here that the length of the T-shaped steel bar 105, the thickness of the circular steel plate 104, the opening diameter, etc. of the device are all reference values, not mandatory values; the device can be adaptively adjusted and manufactured according to the on-site conditions, and the deviation is compared with the traditional detection method through actual on-site tests to ensure that the error is small so as to be suitable for each project. The traditional detection method includes the sediment meter measurement method or the heavy hammer measurement method.

[0041] The above description is only a preferred embodiment of the utility model, and is not intended to limit the utility model. It is known to those skilled in the art that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, under the guidance of the utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the utility model.

Claims

1. A convenient bored pile sediment detection tool, comprising a measuring rope (101), characterized in that: The invention also comprises a T-shaped steel bar (105), a circular steel plate (104) and a fixing clamp (102); a measuring rope (101) is fixed on the top of the T-shaped steel bar (105), and the measuring rope (101) is fixed at the center position of the upper end of the T-shaped steel bar (105); the lower end of the T-shaped steel bar (105) is a conical tip; a positioning hole for the lower end of the T-shaped steel bar (105) to pass through is opened at the center position of the circular steel plate (104); the T-shaped steel bar (105) is connected to the circular steel plate (104) through the positioning hole. 4) a movable connection, so that the lower end of the T-shaped steel bar (105) can move up and down along the center line of the positioning hole; the upper end surface of the circular steel plate (104) is provided with a plurality of connecting lines (103), each connecting line (103) is evenly distributed around the positioning hole, the connecting lines (103) are fixed to the measuring rope (101) through a fixing clamp (102), the lengths of each connecting line (103) are consistent, and the intersection of the measuring rope (101) and each connecting line (103) is located on the vertical center line of the circular steel plate (104).

2. A portable bored pile sediment detection tool according to claim 1, characterized in that: The vertical length of the connecting line (103) after being fixed on the measuring rope (101) is greater than the vertical length of the T-shaped steel bar (105).

3. A portable bored pile sediment detection tool according to claim 1, characterized in that: The upper end surface of the circular steel plate (104) is also provided with a plurality of eyelets, which are circular and evenly distributed around the locating hole.

4. A portable bored pile sediment detection tool according to claim 1, characterized in that: The outer surface of the T-shaped steel bar (105) is coated with anti-rust paint.

5. A portable bored pile sediment detection tool according to any one of claims 1 to 4, characterized in that: The number of the connecting wires (103) is three, one end of the three connecting wires (103) is evenly distributed around the positioning hole, the connecting lines of the fixed points of the three connecting wires (103) on the circular steel plate (104) form an equilateral triangle, and the other end of the three connecting wires (103) is fixedly connected to a point on the measuring rope (101) through a fixing clamp (102).

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