Expanded head anchor rod hole measuring device

Abstract

The utility model discloses an expanded-head anchor rod hole measuring device which comprises a center rod and a sleeve, the diameter of the lower end of the sleeve is larger than that of the upper end of the sleeve, and the expanded-head anchor rod hole measuring device is characterized in that the center rod penetrates into the sleeve, scales are arranged at the upper end of the sleeve, movable arms are evenly hinged to the lower end of the sleeve, and the other ends of the movable arms extend out of the sleeve from openings in the side wall of the lower end of the sleeve. Contact balls are arranged at the ends, extending out of the sleeves, of the movable arms, bottom plates are fixedly connected to the bottoms of the sleeves, elastic connecting pieces are fixedly connected to the bottom plates, the other ends of the elastic connecting pieces are fixedly connected to the ends, close to the center rod, of the movable arms, the number of the elastic connecting pieces corresponds to that of the movable arms, and fastening bolts for locking the sleeves and the center rod are arranged at the upper ends of the sleeves. The expanded head anchor rod hole measuring device is small, exquisite, flexible, good in stability, labor-saving in operation and high in applicability. The end of the movable arm is provided with the contact ball which can prevent the end of the movable arm from being inserted into soil on the hole wall, and the hole diameter measurement accuracy is high.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and specifically relates to an enlarged head anchor bolt hole measuring device. Background Technology

[0002] Enlarged anchor holes are formed by drilling equipment equipped with reaming drill bits. Reaming drill bits can be mechanical or jet-type. Mechanical reaming drill bits enlarge the hole by unfolding the drill bit structure, while jet-type reaming drill bits enlarge the hole by increasing the jetting distance. After enlargement, the diameter of the enlarged section needs to be measured using special measuring tools. Chinese Patent Application No. 202010426249.4 discloses a tool and method for measuring the diameter of an enlarged drill hole, comprising a measuring sleeve, a measuring rod, at least one upper measuring rod, and at least one lower measuring rod. The measuring rod has graduation lines. The measuring sleeve is fitted onto the measuring rod and can slide relative to it. The end of the measuring sleeve away from the upper measuring rod is aligned with the graduation lines for easy reading of measurement data. One end of the upper measuring rod is hinged to the end of the measuring sleeve away from the graduated line. One end of the lower measuring rod is hinged to the end of the upper measuring rod away from the measuring sleeve, and the other end of the lower measuring rod is hinged to the end of the measuring rod away from the graduation lines. The above-mentioned measuring tool solves the measurement problem of drilling with an enlarged measuring head. It requires one hand to hold the measuring sleeve and the other hand to operate the measuring rod, similar to the action of opening and closing an umbrella. Since there is often mud in the hole, it will not open when the force is too small, and if the force is too large, the hinge of the upper and lower measuring rods will insert into the mud in the hole wall, affecting the measurement results. Summary of the Invention

[0003] To address the aforementioned problems in the existing technology, this utility model provides an enlarged head anchor bolt bore measuring device that is easy to operate and has high measurement accuracy.

[0004] The objective of this utility model is achieved in the following manner:

[0005] An enlarged-head anchor bolt measuring device includes a central rod and a sleeve. The lower diameter of the sleeve is larger than the upper diameter. The central rod is inserted into the sleeve and has graduations at its upper end. Movable arms are evenly hinged to the lower end of the central rod. The other end of the movable arm extends out of the sleeve from an opening in the lower side wall of the sleeve. A contact ball is provided at the end of the movable arm extending out of the sleeve. A base plate is fixedly connected to the bottom of the sleeve, and elastic connectors are fixedly connected to the base plate. The other end of the elastic connectors is fixedly connected to the movable arm near the central rod. The number of elastic connectors corresponds to the number of movable arms. A fastening bolt is provided at the upper end of the sleeve to lock the sleeve and the central rod.

[0006] There are at least three movable arms.

[0007] The diameter of the contact ball is greater than or equal to 2 centimeters.

[0008] The base plate has a hollow design.

[0009] The elastic connector is a tension spring.

[0010] Compared to existing technologies, this invention connects the movable arms to the base using an elastic connector, balancing multiple movable arms and ensuring smooth contact between them and the borehole wall, resulting in good stability. Before use, hold the sleeve and pull the central rod upwards to retract the movable arms, then secure the sleeve to the central rod with a fastening bolt. In use, insert the retracted measuring device into the enlarged head anchor bolt hole, loosen the fastening bolt, and the movable arms will naturally open under the action of the elastic connector until the contact ball at the end touches the borehole wall. The diameter of the enlarged head anchor bolt hole can be directly read from the scale on the upper end of the central rod. This invention discloses an enlarged head anchor bolt measuring device that is compact, flexible, stable, and easy to read. When measuring the borehole diameter, there is no need to manually operate the central rod; the movable arms automatically open due to the elastic force of the elastic connector. Compared to existing devices, it is more labor-saving, freeing up one hand and making it more versatile. The contact ball at the end of the movable arm prevents the end from inserting into the soil of the borehole wall, ensuring high accuracy in borehole diameter measurement. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various modifications or alterations to the present invention, and these equivalent forms also fall within the scope defined by the present invention.

[0013] like Figure 1 As shown, an enlarged head anchor bolt hole measuring device includes a central rod 2 and a sleeve 3. The lower diameter of the sleeve 3 is larger than the upper diameter, that is, the lower end of the sleeve 3 is adapted to the enlarged head anchor bolt hole 8. The central rod 2 is inserted into the sleeve 3. The upper end has a scale, and the lower end is evenly hinged with movable arms 1. The other end of the movable arm 1 extends out of the sleeve 2 from the opening on the lower side wall of the sleeve 3. The end of the movable arm 1 extending out of the sleeve 2 is provided with a contact ball 7. The bottom of the sleeve 3 is fixedly connected to a base plate 4. The base plate 4 is fixedly connected to an elastic connector 5. The other end of the elastic connector 5 is fixedly connected to the movable arm 1 near the central rod. The number of elastic connectors 5 corresponds to the number of movable arms 1. The upper end of the sleeve 3 is provided with a fastening bolt 6 to lock the sleeve and the central rod. The elastic connector 5 is a tension spring.

[0014] When not in use, hold the sleeve 3 and lift the center rod 2 upwards to retract the movable arm 1. At this time, the tension spring is in its maximum extension state. Use the fastening bolt 6 to fix the sleeve 3 to the center rod 2. When in use, hold the sleeve 3 and insert the retracted measuring instrument into the enlarged head anchor bolt hole 8. Loosen the fastening bolt 6. The movable arm 1 moves downwards under the tension of the tension spring, causing the center rod to move downwards. Due to the constraint of the opening on the side wall of the sleeve 3, the movable arm naturally opens until the contact ball 7 at the end of the movable arm touches the hole wall of the enlarged head anchor bolt hole 8. The diameter of the enlarged head anchor bolt hole can be obtained by directly reading the scale at the upper end of the center rod 2. After use, pull the center rod upwards to retract the movable arm 1 and use the fastening bolt 6 to fix the sleeve 3 to the center rod 2. The contact ball 7 contacts the hole wall of the enlarged head anchor bolt hole 8 to prevent the end of the movable arm 1 from inserting into the loose hole wall, which would affect the accuracy of the measurement results.

[0015] Furthermore, the movable arm 1 has at least three arms, which are evenly hinged to the lower end of the central rod 2. When measuring the diameter of the enlarged head anchor bolt hole 8, the movable arm has multiple points of contact with the enlarged head anchor bolt hole 8, resulting in better stability and higher measurement accuracy.

[0016] A further optimized solution is a hollow design for the base plate 4. Since the construction environment for the enlarged head anchor hole 8 is harsh, with mud often contaminating the borehole measuring instrument, designing the base plate 4 as hollow allows the mud to drain out through the hollow openings. After use, rinsing the borehole measuring instrument with clean water removes the mud, preventing mud from jamming the joints and affecting its performance.

[0017] Work process:

[0018] 1. After the construction of the enlarged head anchor bolt hole 8 is completed, hold the sleeve 3, lift the center rod 2 upwards, retract the movable arm 1, tighten the fastening bolt 6 on the sleeve 3, keep the hole measuring device in the retracted state, insert the hole measuring device into the enlarged head anchor bolt hole 8 until the bottom plate 4 at the bottom of the sleeve 3 reaches the depth position of the enlarged head anchor bolt hole. This depth position can be the bottom of the hole, or the middle or upper part of the hole. The hole measuring device is suspended in the air to perform hole measuring operations.

[0019] 2. Loosen the fastening bolt 6. Under the action of the tension spring, the multiple movable arms 1 will open naturally until the contact ball at the end touches the hole wall of the enlarged head anchor bolt hole 8.

[0020] 3. The scale at the top of the center rod 2 is predetermined according to the expansion size of the movable arm 1. The diameter of the anchor bolt hole 8 of the enlarged head can be read directly. Since the extension of the movable arm is automatically opened by the elastic force of the elastic connector, it is more labor-saving than the existing device and can free up one hand. If the measuring hole is made at the bottom of the anchor bolt hole of the enlarged head, both hands can be freed up.

[0021] 4. After use, close the borehole measuring tool, tighten the fastening bolt 6, pull out the enlarged head anchor bolt hole 8, and rinse it clean with water.

[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A bell head anchor rod hole gauge comprising a central rod (2) and a sleeve (3), the sleeve (3) having a larger diameter at its lower end than at its upper end, characterised in that: The center rod (2) is inserted into the sleeve (3). The upper end has a scale, and the lower end is evenly hinged with movable arms (1). The other end of the movable arm (1) extends out of the sleeve (3) from the opening on the lower side wall of the sleeve (3). The end of the movable arm (1) extending out of the sleeve (3) is provided with a contact ball (7). The bottom of the sleeve (3) is fixedly connected to the base plate (4). The base plate (4) is fixedly connected to the elastic connector (5). The other end of the elastic connector (5) is fixedly connected to the movable arm (1) near the center rod. The number of elastic connectors (5) corresponds to the number of movable arms (1). The upper end of the sleeve (3) is provided with a fastening bolt (6) to lock the sleeve and the center rod.

2. A bell head anchor rod hole gauge according to claim 1 wherein: There are at least three movable arms (1).

3. The enlarged head anchor rod hole gauge of claim 1, wherein: The diameter of the contact ball (7) is greater than or equal to 2 cm.

4. The enlarged head anchor rod hole gauge of claim 1 wherein: The base plate (4) has a hollow design.

5. The enlarged head anchor rod hole gauge of claim 1 wherein: The elastic connector (5) is a tension spring.

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