Foundation compaction settlement detection method adopting auxiliary measuring hammer

Abstract

The invention provides a foundation compaction settlement detection method adopting an auxiliary measuring hammer, which is characterized in that a measuring rope parallel to a lifting rammer is mounted on a suspension arm of a dynamic compaction machine, the front end of the measuring rope is connected with the measuring hammer, a tension sensor is mounted on the measuring rope, and a magnetic suction device is mounted on the lower surface of the measuring hammer and / or the upper surface of the rammer; the magnetic attraction device is used for magnetic attraction between the measuring hammer and the rammer. After the rammer falls to the ground, the measuring hammer falls to the upper surface of the rammer and is magnetically attracted with the rammer, then the winch is controlled to enable the measuring rope to lift the measuring hammer upwards, and when the tension sensor detects that the measuring rope reaches a set large tension value, the length of the released measuring rope at the moment is measured and recorded. The process is repeatedly executed, and the difference value between the rope length measured this time and the rope length measured last time is the ramming settlement of the rammer this time. The real-time monitoring of the compaction settlement amount of the dynamic compaction machine is effectively realized, and the method has the advantages of simplicity and convenience in operation, accuracy in measurement and high feasibility.

Description

Technical Field

[0001] The present invention belongs to the technical field of dynamic compaction construction, and particularly relates to a method for detecting the foundation compaction settlement amount by using an auxiliary measuring hammer. Background Technique

[0002] The dynamic compaction method, also known as the Dynamic Consolidation Method or the Dynamic Compaction Method, is a method in which a heavy hammer (generally 5 - 40t) is lifted by a dynamic compactor to a corresponding height (generally 6 - 30m), and then the heavy hammer is allowed to fall freely. Under the impact of the heavy hammer, strong shock waves and impact dynamic stresses appear in the foundation soil, thereby reducing the compressibility of the foundation soil, improving the anti-liquefaction conditions of sandy soil, increasing the strength of the foundation soil. In addition, it can also reduce the unevenness of the soil layer and reduce the possible differential settlement.

[0003] A dynamic compactor is a machine used for compacting loose soil in construction projects. It is often used for treatment. There are many types of dynamic compactors, including frog type, vibrating type, leaping type, ramming type, and hanging heavy hammer impact type. Different types of dynamic compactors are used according to engineering needs.

[0004] The compaction settlement amount is one of the important construction parameters, and its detection means are relatively backward. During on-site dynamic compaction construction, affected by the site geological conditions and construction level, it is very difficult to control the foundation compaction settlement amount. If the compaction settlement amount fails to reach the design depth, the foundation reinforcement effect cannot be guaranteed. The traditional manual measurement method relies on surveyors to complete leveling measurement using a level. This method has low efficiency and there are certain safety risks during construction. The process of relying on on-site staff to record, analyze, statistically process, organize, and file the compaction settlement amount per blow is cumbersome, labor-consuming, has low efficiency, and data analysis lags behind. It is difficult to effectively guarantee the construction quality, and there are limitations such as low efficiency, large deviation, high labor intensity, and poor information management level. Manual measurement of the compaction settlement amount has limitations such as high labor intensity, small data volume, and poor accuracy. Therefore, a new method is needed to monitor the compaction settlement amount in real time to ensure the construction effect of the project.

[0005] Therefore, a measuring device for the compaction settlement amount of a dynamic compaction foundation is needed to achieve the effects of safety, accuracy, and convenience. Summary of the Invention

[0006] In order to solve the deficiencies of the prior art, the present invention provides a method for detecting the foundation compaction settlement amount by using an auxiliary measuring hammer. This method can not only accurately measure the size of the compaction settlement amount, but also improve the efficiency and ensure the safety of the staff.

[0007] The present invention is realized through the following technical solutions:

[0008] A method for detecting the tamping settlement of a foundation using an auxiliary measuring hammer. A measuring rope parallel to the lifted tamping hammer is installed on the boom of a dynamic compactor. The front end of the measuring rope is connected with an auxiliary measuring hammer, and a tension sensor is installed on the measuring rope to detect the tension of the measuring rope. The measuring rope is installed on a winch, and the winch controls the amount of the measuring rope retracted and released to control the lifting and lowering of the auxiliary measuring hammer. It also includes a measuring rope length detection device for calculating the retracted and released length of the measuring rope in real time. A magnetic attraction device is installed on the lower surface of the auxiliary measuring hammer and / or the upper surface of the tamping hammer for magnetic attraction between the auxiliary measuring hammer and the tamping hammer.

[0009] After the tamping hammer hits the ground, control the winch to lower the auxiliary measuring hammer to the upper surface of the tamping hammer and magnetically attract it. Then control the winch to lift the auxiliary measuring hammer upward with the measuring rope. When the tension sensor detects that the set tension value is reached on the measuring rope, it means that the measuring rope is in a taut state at this time. Measure and record the length of the measuring rope released at this time through the measuring rope length detection device.

[0010] Repeat the above process. The difference between the length of the measuring rope this time and the length of the measuring rope last time is the tamping settlement of the tamping hammer this time.

[0011] In the above technical solution, the measuring rope is parallel to the tamping hammer rope and passes through the roller at the top of the boom.

[0012] In the above technical solution, the measuring rope length detection device is a rotary encoder set on the winch to calculate the retracted and released length of the measuring rope.

[0013] In the above technical solution, the measuring rope length detection device is a rotary encoder set on the roller at the front end of the boom of the dynamic compactor to calculate the retracted and released length of the measuring rope.

[0014] In the above technical solution, the tension sensor, the measuring rope length detection device and the winch are all connected to the central control system of the dynamic compactor through wired / wireless communication.

[0015] In the above technical solution, the central control system is in the cockpit of the dynamic compactor.

[0016] The advantages and beneficial effects of the present invention are:

[0017] 1. The present invention is different from the traditional manual measurement method, and this measurement method is safer.

[0018] 2. Since shock waves will be generated instantaneously during tamping, some precision electronic devices such as lasers may be affected by the shock waves and the measurement may not be accurate, while the measurement of the present invention will not be affected by the shock waves.

[0019] 3. The present invention uses a tensile force sensor to detect the magnitude of the tensile force on the measuring rope. After the auxiliary measuring hammer is placed on the rammer, when the measuring rope lifts the auxiliary measuring hammer, the tensile force sensor reaches the set tensile force value, indicating that the measuring rope is in a tightened state at this time and the auxiliary measuring hammer is in close contact with the rammer. At this time, the length of the measuring rope is measured, ensuring the accuracy and effectiveness of each measurement (i.e., each measurement is carried out when the measuring rope is in a tightened state). In addition, since the weight of the measuring rammer is much smaller than that of the rammer, the suction force between the measuring rammer and the rammer is also limited. Therefore, only a smaller specification tensile force sensor is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a measuring device for the tamping settlement amount of a dynamic compaction foundation.

[0021] Figure 2 is a schematic diagram of the bottom surface of the auxiliary measuring hammer.

[0022] Figure 3 is a schematic diagram of the upper surface of the rammer.

[0023] For those of ordinary skill in the art, without creative efforts, other related drawings can be obtained based on the above drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to enable those skilled in the art of the present technology to better understand the solution of the present invention, the technical solution of the present invention will be further described below in conjunction with specific embodiments.

[0025] See Figure 1 , a method for detecting the tamping settlement amount of a foundation using an auxiliary measuring hammer. A measuring rope 2 parallel to the lifting rope of the rammer is installed on the boom 1-3 of the dynamic compactor 1. The measuring rope 2 is parallel to the rammer rope and passes through the roller 1-4 at the front end of the boom. The front end of the measuring rope 2 is connected with an auxiliary measuring hammer 2-1. A tensile force sensor 3 is installed on the measuring rope 2 for detecting the tensile force of the measuring rope.

[0026] The tail of the measuring rope 2 is installed on the winch 6, and the winch 6 controls the amount of the measuring rope retracted and released to control the lifting and lowering of the auxiliary measuring hammer. It should be noted that this winch 6 only responsible for controlling the lifting and lowering of the auxiliary measuring hammer 2-1, and the lifting and lowering of the rammer is controlled by another winch.

[0027] It also includes a measuring rope length detection device for calculating the retracted and released length of the measuring rope in real time. In this embodiment, the measuring rope length detection device can be a rotary encoder set on the winch to calculate the retracted and released length of the measuring rope; or a rotary encoder is set on the roller at the front end of the boom 1-3 of the dynamic compactor 1 to calculate the retracted and released length of the measuring rope.

[0028] A magnetic attraction device is installed on the lower surface of the auxiliary measuring hammer and / or the upper surface of the rammer for magnetic attraction between the auxiliary measuring hammer and the rammer.

[0029] The tension sensor, the measuring rope length detection device, and the winch are all connected to the central control system of the dynamic compactor through wired / wireless communication. The central control system is in the cockpit 1-5 of the dynamic compactor 1, controls the operation of the winch 6, and collects the detection data of the tension sensor and the measuring rope length detection device.

[0030] See Appendix Figure 2 and Appendix Figure 3 As shown in the appendix, a lifting lug 1-1-1 is provided at the top of the rammer 1-1 for connecting the rammer rope; a lower magnetic attraction sheet 4 is provided on the lower surface of the measuring rammer 2-1, and an upper magnetic attraction sheet 5 is provided on the upper surface of the rammer 1-1. When the measuring rammer 2-1 is placed on the upper surface of the rammer 1-1, the measuring rammer 2-1 and the rammer 1-1 are magnetically attracted; alternatively, a magnetic attraction sheet can also be provided only on the lower surface of the measuring rammer 2-1 or the upper surface of the rammer 1-1. Since the measuring rammer and the rammer are made of iron, magnetic attraction can also be achieved.

[0031] Furthermore, the weight of the measuring rammer is much smaller than that of the rammer.

[0032] The method for detecting the foundation compaction settlement is as follows:

[0033] After the rammer hits the ground, control the winch 6 to lower the auxiliary measuring hammer to the upper surface of the rammer and magnetically attract it. Then control the winch 6 to lift the measuring rope upward to lift the auxiliary measuring hammer. When the tension sensor detects that the tension on the measuring rope reaches a set large tension value (this indicates that the measuring rope is in a taut state and the auxiliary measuring hammer and the rammer are in close contact), the central control system measures and records the length of the measuring rope released at this time through the measuring rope length detection device. It should be noted that during the process of the winch 6 lifting the auxiliary measuring hammer upward through the measuring rope, due to the magnetic attraction between the auxiliary measuring hammer and the rammer, the tension sensor on the measuring rope will detect a large tension value. Subsequently, as the winch 6 continues to lift, the auxiliary measuring hammer will overcome the magnetic attraction force and separate from the rammer. At this time, the tension sensor will instantaneously decrease, and then the auxiliary measuring hammer will be lifted upward and reset.

[0034] Repeat the above process. The difference between the length of the measuring rope this time and the length of the measuring rope last time is the compaction settlement of the rammer this time.

[0035] The above is an exemplary description of the present invention. It should be noted that without departing from the core of the present invention, any simple deformation, modification, or equivalent replacement that can be made by those skilled in the art without creative labor falls within the protection scope of the present invention.

Claims

1. A method for detecting foundation tamping settlement using an auxiliary measuring hammer, characterized in that: A measuring rope parallel to the lifting rammer is installed on the boom of the rammer, the front end of the measuring rope is connected to an auxiliary measuring hammer, and a tension sensor is installed on the measuring rope to detect the tension of the measuring rope; the measuring rope is installed on a winch, and the winch controls the retraction and extension amount of the measuring rope to control the rise and fall of the auxiliary measuring hammer; it also includes a measuring rope length detection device for calculating the retraction and extension length of the measuring rope in real time; a magnetic attraction device is installed on the lower surface of the auxiliary measuring hammer and / or the upper surface of the rammer, which is used for magnetic attraction between the auxiliary measuring hammer and the rammer; After the rammer hits the ground, the winch is controlled to make the auxiliary measuring hammer fall to the upper surface of the rammer and be magnetically attracted to it, and then the winch is controlled to make the measuring rope pull the auxiliary measuring hammer upward. When the tension sensor detects that the set tension value on the measuring rope is reached, it means that the measuring rope is in a tensioned state. The length of the measuring rope released at this time is measured and recorded by the measuring rope length detection device; Repeat the above process, and the difference between the rope length measured this time and the rope length measured last time is the tamping amount of the tamping hammer this time.

2. The method for detecting foundation tamping amount using an auxiliary measuring hammer according to claim 1, characterized in that: The measuring rope is parallel to the rammer rope and passes through the roller at the top of the boom.

3. The method for detecting foundation tamping amount using an auxiliary measuring hammer according to claim 1, characterized in that: The rope length measuring device is a rotary encoder arranged on the winch.

4. The method for detecting foundation tamping amount using an auxiliary measuring hammer according to claim 2, characterized in that: The rope length measuring device is a rotary encoder arranged on a roller at the top of the boom of the compacting machine.

5. The method for detecting foundation tamping amount using an auxiliary measuring hammer according to claim 1, characterized in that: The tension sensor, the rope length measuring device and the winch are all connected to the central control system of the compaction machine through wired / wireless communication.

6. The method for detecting foundation tamping amount using an auxiliary measuring hammer according to claim 5, characterized in that: The central control system is in the cockpit of the compaction machine.

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