Thickness measuring tool for solid sediment layer at hole bottom of rotary excavating drilling pile

Abstract

The utility model discloses a tool for measuring the thickness of a solid sediment layer at the hole bottom of a rotary excavating drilled pile, and relates to the technical field of building construction measuring tools, the measuring tool comprises a range finder, a measuring scale and a downward probing assembly, the downward probing assembly comprises a conical head, a probing rod and at least one set of limiting mechanism arranged on the conical head; the central axis and the sliding direction of the probe rod are parallel to the central axis of the measuring scale; a first sliding cavity is formed in the conical head, the top end of the feeler lever extends into the first sliding cavity, and a movable plug is arranged at the end of the feeler lever; a limiting block and a spring are arranged in the first sliding cavity, and the two ends of the spring abut against the movable plug and the limiting block correspondingly. The structure design of the probe rod and the conical head is convenient for the probe rod and the conical head to easily penetrate through a sediment layer to reach a hard soil layer; when the bottom end face of the probe rod and the bottom end face of the conical head are both in contact with the hard soil layer, the limiting mechanism can enable the conical head not to continue to drill into the hard soil layer any more, and subsequent reading is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of construction measurement tools, in particular to a tool for measuring the thickness of a solid sediment layer at the bottom of a rotary bored pile hole. Background Art

[0002] The sediment at the bottom of a bored pile is a loose structure, and its soil density is much lower than that of the underlying hard soil layer. The presence of sediment at the bottom of the hole, or loose soil, is a significant factor affecting the bearing capacity and foundation consistency of bored piles. Thick sediment at the bottom of the hole reduces pile base stiffness and the allowable bearing capacity.

[0003] In actual measurement of the thickness of the sediment layer at the bottom of the pile hole, the measurement accuracy is usually at the centimeter level. After cleaning the hole, the sediment thickness at the bottom of the hole is usually controlled as follows: the sediment thickness at the bottom of the end-bearing pile is ≤50mm; the sediment thickness at the bottom of the friction pile is ≤150mm.

[0004] The most common method for measuring bottom sediment thickness in existing technology involves attaching a pendulum to the bottom of a measuring rope and striking the bottom of the hole with it. The accuracy of this method relies entirely on the surveyor's feel and experience, resulting in discrepancies in actual measurements and repeated measurements, which reduces construction efficiency.

[0005] Therefore, in order to solve the above problems, a tool for measuring the thickness of the solid sediment layer at the bottom of a rotary bored pile hole is proposed. Utility Model Content

[0006] The utility model aims to overcome the deficiencies of the prior art and provide a tool for measuring the thickness of a solid sediment layer at the bottom of a rotary bored pile hole.

[0007] The purpose of this utility model is achieved through the following technical solutions:

[0008] A tool for measuring the thickness of a solid sediment layer at the bottom of a rotary bored pile hole comprises a rangefinder, a measuring ruler, and a probe assembly arranged on the measuring ruler, wherein the probe assembly comprises a conical head arranged at the bottom end of the measuring ruler, a probe rod slidably arranged at the bottom end of the conical head, and at least one set of limiting mechanisms arranged on the conical head; the central axis and sliding direction of the probe rod are parallel to the central axis of the measuring ruler; a first sliding cavity is defined in the conical head, the top end of the probe rod extends into the first sliding cavity, and a movable plug is provided at this end; a limiting block and a spring are provided in the first sliding cavity, and the two ends of the spring respectively abut against the movable plug and the limiting block.

[0009] Furthermore, in the present invention, the bottom end surface of the probe rod is a plane, and the plane is parallel to the bottom end surface of the conical head.

[0010] Furthermore, in the present invention, the above-mentioned limiting mechanism includes a clamping rod rotatably arranged on the above-mentioned conical head, and the above-mentioned clamping rod is fitted to the conical surface of the above-mentioned conical head; a first air channel and a second air channel connected to each other are opened in the above-mentioned conical head; the above-mentioned first sliding cavity is connected to the above-mentioned first air channel, and an exhaust through hole connected to the above-mentioned first sliding cavity is opened on the above-mentioned conical head; a second sliding cavity connected to the above-mentioned second air channel is opened in the above-mentioned conical head, and a pushing piston is arranged in the above-mentioned second sliding cavity, and the execution end of the above-mentioned pushing piston abuts against the above-mentioned clamping rod; when the lower end face of the above-mentioned probe rod is coplanar with the bottom end face of the above-mentioned conical head, the above-mentioned movable plug prevents the gas in the above-mentioned first air channel from entering the above-mentioned first sliding cavity.

[0011] Furthermore, in the present invention, a torsion spring is provided on the rotating shaft, and the torsion spring enables the clamping rod to always fit the conical surface of the conical head.

[0012] Furthermore, in the present invention, the extension direction of the above-mentioned first sliding cavity is parallel to the central axis of the above-mentioned measuring ruler; a compression adjustment mechanism is provided in the above-mentioned measuring ruler, and the above-mentioned compression adjustment mechanism includes a sleeve passing through the above-mentioned measuring ruler, and an adjustment rod threadedly connected to the above-mentioned sleeve, and one end of the above-mentioned adjustment rod is connected to the above-mentioned limit block.

[0013] Furthermore, in the present invention, the large end of the conical head is connected to the bottom end of the measuring ruler; and the probe rod is slidably disposed on the small end of the conical head.

[0014] Furthermore, in the present invention, the outer side wall of the probe rod is provided with a thread.

[0015] Furthermore, in the present invention, the measuring ruler is a hollow structure, and an air pipe communicating with the first air channel is provided inside the measuring ruler.

[0016] The beneficial effects of the utility model are:

[0017] The utility model provides a tool for measuring the thickness of the solid sediment layer at the bottom of a rotary bored pile hole, which consists of a measuring ruler, a conical head, a probe rod and a limiting mechanism. The structural design of the probe rod and the conical head facilitates the two to easily penetrate the sediment layer to reach the hard soil layer; when the bottom end face of the probe rod and the bottom end face of the conical head are in contact with the hard soil layer, the limiting mechanism can prevent the conical head from continuing to drill into the hard soil layer, thereby facilitating subsequent readings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 sectional view of

[0020] Figure 3 This is a schematic structural diagram of the expanded limit mechanism of an embodiment of the utility model;

[0021] Figure 4 A schematic diagram of the measurement process of an embodiment of the present utility model;

[0022] Figure 5 Schematic diagram of the measurement process of an embodiment of the present utility model.

[0023] In the figure: 101- measuring ruler; 201- conical head; 202- probe rod; 203- first sliding cavity; 204- movable plug; 205- limit block; 206- spring; 301- clamping rod; 302- first air channel; 303- second air channel; 304- exhaust hole; 305- second sliding cavity; 306- pushing piston; 401- rotating shaft; 402- torsion spring; 501- sleeve; 502- adjusting rod; 601- air pipe; 701- pile hole; 801- sediment layer; 901- natural ground. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0025] See also Figure 1-5 , the utility model provides a technical solution:

[0026] A tool for measuring the thickness of a solid sediment layer at the bottom of a rotary bored pile hole comprises a rangefinder (not shown), a measuring ruler 101, and a probe assembly disposed on the measuring ruler 101. The probe assembly comprises a conical head 201 disposed at the bottom end of the measuring ruler 101, a probe rod 202 slidably disposed at the bottom end of the conical head 201, and at least one set of limiting mechanisms disposed on the conical head 201. The central axis and sliding direction of the probe rod 202 are both parallel to the central axis of the measuring ruler 101. A first sliding cavity 203 is defined in the conical head 201. The top end of the probe rod 202 extends into the first sliding cavity 203, and a movable plug 204 is disposed at this end. A limiting block 205 and a spring 206 are disposed in the first sliding cavity 203, and the two ends of the spring 206 respectively abut against the movable plug 204 and the limiting block 205.

[0027] When the bottom end face of the probe rod 202 contacts the hard soil layer, in order to increase the resistance of the probe rod 202 to continue drilling, in this embodiment, the bottom end face of the probe rod 202 is designed to be a plane, and this plane is parallel to the bottom end face of the conical head 201.

[0028] Specifically, in this embodiment, the limiting mechanism includes a clamping rod 301 rotatably set on the conical head 201, and the clamping rod 301 is fitted to the conical surface of the conical head 201; a first air channel 302 and a second air channel 303 that are connected to each other are provided in the conical head 201; the first sliding cavity 203 is connected to the first air channel 302, and an exhaust through hole 304 that is connected to the first sliding cavity 203 is provided on the conical head 201; a second sliding cavity 305 that is connected to the second air channel 303 is provided in the conical head 201, and a pushing piston 306 is provided in the second sliding cavity 305, and the executing end of the pushing piston 306 abuts against the clamping rod 301; when the lower end surface of the probe rod 202 is coplanar with the bottom end surface of the conical head 201, the movable plug 204 prevents the gas in the first air channel 302 from entering the first sliding cavity 203.

[0029] The conical head 201 is provided with a rotating shaft 401, and the clamping rod 301 is rotatably connected to the rotating shaft 401. In order to make the clamping rod 301 always fit the conical surface of the conical head 201 when not working, at least one torsion spring 402 is installed on the rotating shaft 401.

[0030] Before measurement, the thickness of the sediment layer 801 within the current pile hole 701 can be estimated. The height of the stop block 205 can then be adjusted to adjust the compression stroke of the spring 206. The first sliding cavity 203 extends parallel to the central axis of the measuring ruler 101. A compression adjustment mechanism for adjusting the compression stroke of the spring 206 is installed within the measuring ruler 101. This mechanism comprises a sleeve 501 threaded through the measuring ruler 101 and an adjustment rod 502 threadedly connected to the sleeve 501. One end of the adjustment rod 502 is connected to the stop block 205.

[0031] In this embodiment, the large end of the conical head 201 is connected to the bottom end of the measuring ruler 101, and the probe 202 is slidably mounted on the small end of the conical head 201. This mounting method allows the conical head 201 to drill quickly into the sediment layer 801.

[0032] In order to facilitate the probe rod 202 to penetrate the sediment layer 801 more easily, a thread is designed on the outer wall of the probe rod 202.

[0033] In order to facilitate the supporting gas supply equipment to deliver gas with a certain pressure into the first gas channel 302 and the second gas channel 303, a gas pipe 601 connected to the first gas channel 302 is installed in the measuring ruler 101.

[0034] Working principle:

[0035] like Figure 4As shown, before measurement, a line-releasing mechanism can be installed at the entrance of the pile hole 701, with the line connected to the adjusting rod 502. The accompanying air supply equipment is then activated to supply gas at a certain pressure into the gas pipe 601. The gas flows through the gas pipe 601 into the first and second air passages 302 and 303. At this point, the spring 206 causes the movable plug 204 to abut against the bottom of the first sliding cavity 203, thereby establishing communication between the first and second air passages 302 and 303. The gas within the gas pipe 601 then flows into the outside world via the first air passage 302, the first sliding cavity 203, and the exhaust hole 304, thereby relieving pressure from the first and second air passages 302 and 303. As a result, the air pressure within the second air passage 303 is relatively low, preventing the piston 306 from moving toward the locking rod 301. This means that the piston 306 cannot push the locking rod 301 during this process. The measuring tool is then lowered to the bottom of the pile hole 701. During the lowering process, the rope can be rotated so that the measuring tool rotates while falling.

[0036] When the bottom end of the probe rod 202 contacts the upper surface of the sediment layer 801, the sediment layer 801 is relatively loose, with a much lower soil density than the hard soil layer below it. Furthermore, the measuring tool rotates during its descent, and the threads on the outer wall of the probe rod 202 allow the probe rod 202 to be easily inserted into the sediment layer 801. Once the conical head 201 contacts the sediment layer 801, its small-diameter end can also easily penetrate into the sediment layer 801 due to its rotation.

[0037] When the bottom end surface of the probe rod 202 contacts the hard soil layer, due to its flat bottom, the probe rod 202 stops falling due to the greater resistance of the hard soil layer. However, since the bottom end surface of the conical head 201 has not yet contacted the hard soil layer, the conical head 201 continues to fall. During this process, the probe rod 202 gradually retracts into the first sliding cavity 203, the spring 206 is compressed, and the movable plug 204 moves toward the stop block 205. When the bottom end surface of the conical head 201 contacts the hard soil layer, the bottom end surface of the conical head 201 is now coplanar with the bottom end surface of the probe rod 202. At this point, the movable plug 204 moves to the connection between the first sliding cavity 203 and the first airway 302, blocking this connection. The gas pressure in the gas pipeline 601 can now only act on the push piston 306. The push piston 306 moves toward the locking rod 301 within the second sliding cavity 305. When the piston 306 is pushed to move to the limit position, as shown in FIG. Figure 3 or Figure 5 As shown, the end of the clamping rod 301 is pressed against the hard soil layer, or a part is inserted into the hard soil layer. At this moment, this measuring tool can no longer move downward under the effect of the clamping rod 301, and can start reading this moment.

[0038] The length of the conical head 201 along the axial direction of the measuring ruler 101 is H, a known value. The length of the measuring ruler 101 within the pile hole 701, i.e., the vertical distance between the natural ground 901 and the upper end surface of the conical head 201, can be read on the measuring ruler 101 and recorded as X. The vertical distance between the natural ground 901 and the upper surface of the sediment layer 801 is then measured using a distance meter and recorded as Y. Therefore, the current thickness of the sediment layer 801 within the pile hole 701 is: X + H - Y.

[0039] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A tool for measuring the thickness of the solid sediment layer at the bottom of a rotary bored pile hole, comprising a distance meter, characterized in that: The invention also includes a measuring ruler (101) and a probe assembly arranged on the measuring ruler (101), wherein the probe assembly includes a conical head (201) arranged at the bottom end of the measuring ruler (101), a probe rod (202) slidably arranged at the bottom end of the conical head (201), and at least one set of limiting mechanisms arranged on the conical head (201); the central axis and the sliding direction of the probe rod (202) are parallel to the central axis of the measuring ruler (101); a first sliding cavity (203) is opened in the conical head (201), the top end of the probe rod (202) extends into the first sliding cavity (203), and a movable plug (204) is provided at this end; a limiting block (205) and a spring (206) are provided in the first sliding cavity (203), and the two ends of the spring (206) are respectively in contact with the movable plug (204) and the limiting block (205).

2. A tool for measuring the thickness of the solid sediment layer at the bottom of a rotary bored pile according to claim 1, characterized in that: The bottom end surface of the probe rod (202) is a plane, and the plane is parallel to the bottom end surface of the conical head (201).

3. The tool for measuring the thickness of the solid sediment layer at the bottom of a rotary bored pile according to claim 2, characterized in that: The limiting mechanism comprises a clamping rod (301) rotatably arranged on the conical head (201), wherein the clamping rod (301) is fitted to the conical surface of the conical head (201); a first air passage (302) and a second air passage (303) are provided in the conical head (201) and are connected to each other; the first sliding cavity (203) is connected to the first air passage (302), and an exhaust through hole (304) is provided on the conical head (201) and is connected to the first sliding cavity (203); A second sliding cavity (305) communicating with the second air channel (303) is provided in the conical head (201), and a pushing piston (306) is provided in the second sliding cavity (305), and the execution end of the pushing piston (306) abuts against the clamping rod (301); when the lower end surface of the probe rod (202) is coplanar with the bottom end surface of the conical head (201), the movable plug (204) prevents the gas in the first air channel (302) from entering the first sliding cavity (203).

4. A tool for measuring the thickness of the solid sediment layer at the bottom of a rotary bored pile according to claim 3, characterized in that: A rotating shaft (401) is provided on the conical head (201), and the clamping rod (301) is rotatably connected to the rotating shaft (401); a torsion spring (402) is provided on the rotating shaft (401), and the torsion spring (402) enables the clamping rod (301) to always fit the conical surface of the conical head (201).

5. A tool for measuring the thickness of the solid sediment layer at the bottom of a rotary bored pile according to any one of claims 1 to 3, characterized in that: The extension direction of the first sliding cavity (203) is parallel to the central axis of the measuring ruler (101); a compression adjustment mechanism is provided in the measuring ruler (101), and the compression adjustment mechanism comprises a sleeve (501) passing through the measuring ruler (101), and an adjustment rod (502) threadedly connected to the sleeve (501), and one end of the adjustment rod (502) is connected to the limit block (205).

6. The tool for measuring the thickness of the solid sediment layer at the bottom of a rotary bored pile according to claim 3, characterized in that: The large end of the conical head (201) is connected to the bottom end of the measuring ruler (101); and the probe rod (202) is slidably arranged on the small end of the conical head (201).

7. The tool for measuring the thickness of the solid sediment layer at the bottom of a rotary bored pile according to claim 3, characterized in that: The outer side wall of the probe rod (202) is provided with threads.

8. The tool for measuring the thickness of the solid sediment layer at the bottom of a rotary bored pile according to claim 3, characterized in that: The measuring ruler (101) is a hollow structure, and an air delivery pipe (601) communicating with the first air channel (302) is provided inside the measuring ruler (101).

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