Effective pile length control device for three-shaft mixing pile and triple high-pressure jet grouting pile

Abstract

The utility model discloses a three-shaft mixing pile and triple high-pressure jet grouting pile effective pile length control device which comprises an input display screen and a drill rod top power head, a plurality of laser ranging sensors are installed on the upper portion of the drill rod top power head, and a single chip microcomputer and a control system are arranged between the laser ranging sensors. The laser ranging sensor is firstly connected into the single chip microcomputer through a laid electric connection circuit and finally connected into the input display screen, through a drill rod control system, when laser reaches the pile top elevation, a drill rod starts to spray and stir surrounding soil, and when the drill rod reaches the pile bottom elevation, the drill rod is lifted, and the drill rod starts to spray and stir the surrounding soil. The problems that the pile body length control program is tedious, the effective length of the pile body cannot be accurately controlled and the like are effectively solved, particularly, the construction efficiency can be effectively improved, the effective length of the pile body is guaranteed, and control over the cement consumption is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to an effective pile length control device for a three-axis mixing pile and a triple high-pressure rotary jet pile. Background Art

[0002] The three-axis mixing pile machine is a type of long spiral pile machine with three spiral drilling holes. During construction, the three spiral drilling holes are constructed downward at the same time. It is generally used for underground continuous wall construction methods and foundation pit water-stop curtains. It is an effective form of soft foundation treatment. The mixing pile machine is used to spray cement into the soil and fully mix it, so that a series of physical and chemical reactions occur between the cement and the soil, which hardens the soft soil and improves the foundation strength. The triple-tube high-pressure rotary jet pile is used as a water-stop curtain at the joint of the bored pile and the underground continuous wall, and as a bottom seal reinforcement for the soft foundation deep pit. In actual construction, the triple-tube high-pressure rotary jet pile and the three-axis mixing pile are difficult to accurately control the effective pile length of the pile. It is impossible to accurately judge whether the pile top elevation and pile bottom elevation of the pile body meet the design requirements, resulting in insufficient pile body length or serious waste of the mixed cement slurry. The main method of traditional pile length control is to make two marks on the drill rod, record the pile top elevation through the lower mark, and record the pile bottom elevation through the upper mark, and use the selected horizontal reference to visually check whether the drill rod mark line is flush with the horizontal reference, so as to estimate the drill rod pile length. This method has many shortcomings:

[0003] Due to objective reasons of the workers themselves, it is difficult to accurately control the pile top elevation and pile bottom elevation to meet the requirements of the specification by visually checking whether the drill rod mark is flush with the horizontal reference object;

[0004] During the construction process, when the pile top elevation is below the natural ground, it is impossible to verify the pile top elevation with a level. The traditional method of visual inspection cannot ensure that the pile top elevation meets the design requirements.

[0005] After the drill rod enters the soil and completes the first construction, the mark at the lower end is easily covered by clay, making it difficult to see clearly. In the subsequent construction, the mark needs to be cleaned continuously, which slows down the construction progress, or the workers directly identify the position of the mark by memory;

[0006] When the natural ground changes, the drill rod needs to be re-marked, and multiple markings are easily confused, resulting in greater uncertainty in the effective length of the pile. Utility Model Content

[0007] The utility model aims to address the deficiencies in the prior art and provides a three-axis mixing pile and triple high-pressure rotary jet pile effective pile length control device, comprising an input display screen and a power head on the top of a drill rod, a plurality of laser ranging sensors installed on the upper portion of the power head on the top of the drill rod, a single-chip microcomputer and a control system are arranged between the laser ranging sensors, the laser ranging sensors are first connected to the single-chip microcomputer and finally to the input display screen through the laid electrical connection line, through the drill rod control system, when the laser reaches the pile top elevation, the drill rod starts to spray and stir the surrounding soil, and when the drill rod reaches the pile bottom elevation, the drill rod is lifted.

[0008] Preferably, the laser ranging sensor is fixed to the power head at the top of the drill pipe by fixing the angle steel, with one group at each end of the power head. A vibration-damping protective tube is provided at the lower part of the drill pipe, and a laser reflecting angle steel is fixed on the vibration-damping protective tube. The laser emitted by the laser ranging sensor is aligned with the laser reflecting angle steel.

[0009] Preferably, the data input into the display screen is processed by a single chip microcomputer to control the depth of the drill rod lifting or sinking.

[0010] Preferably, the data input into the display screen are four data: total length of drill rod, pile top elevation, pile bottom elevation, and natural ground elevation, and the data readable on the display screen are five data: total length of drill rod, pile top elevation, pile bottom elevation, natural ground elevation, and pile head elevation.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] As a new device for controlling the effective length of the pile body, the utility model has the characteristics of high precision and simple operation. It can digitize the results of visual observation, improve the control of cement dosage, and solve the difficult problem of verifying the elevation of the pile top below the natural ground. When the same type of pile is being constructed, it is only necessary to change the elevation of the natural ground on the display screen, which simplifies the construction procedure and greatly speeds up the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the local installation structure of the utility model.

[0016] In the figure: 1. Worker's operating room; 2. Input display screen; 3. Single chip microcomputer; 4. Fixed angle steel; 5. Laser ranging sensor; 6. Power head on the top of the drill pipe; 7. Laser reflection angle steel; 8. Vibration reduction protection tube. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is described in detail below with reference to the accompanying drawings, but the protection scope of the utility model is not limited to the embodiments.

[0018] Reference Figure 1 and Figure 2 The utility model is a three-axis mixing pile and triple high-pressure rotary jet pile effective pile length control device, including an input display screen and a drill rod top power head 6, a plurality of laser distance measuring sensors 5 installed on the top of the drill rod top power head 6, a plurality of single-chip microcomputers 3, a three-axis, high-pressure rotary jet drill rod working control system, and a laid electrical connection line. Four data can be input into the input display screen: the total length of the drill rod, the natural ground elevation, the pile top elevation, and the pile bottom elevation; a laser distance measuring sensor 5 is installed at each end of the drill rod top power head 6, which is first connected to the single-chip microcomputer and finally connected to the input display screen through the laid electrical connection line. Through the settings in the drill rod working control system, when the laser reaches the pile top elevation, the drill rod starts to spray and stir the surrounding soil, and when the drill rod reaches the pile bottom elevation, the drill rod is lifted (the three axes determine whether to perform manual re-spraying and re-stirring according to the on-site pile test situation, and the re-stirring depth can be read through the pile head elevation in the display screen).

[0019] Furthermore, the value measured by the laser ranging sensor fixed on the moving head of the drill rod is the distance between the moving head of the drill rod and the vibration-damping protective tube 8 at the bottom of the drill rod. Since the total length of the drill rod is fixed, the distance is converted through the single-chip microcomputer. The distance reflects the actual length of the drill rod entering the soil, and determines whether the drill bit has reached the pile top elevation and the pile bottom elevation based on the natural ground elevation. A laser reflecting angle steel 7 is fixed on the vibration-damping protective tube 8, and the laser emitted by the laser ranging sensor is aligned with the laser reflecting angle steel 7.

[0020] Furthermore, two laser distance measuring sensors are provided to obtain an average value, thereby eliminating the influence of a single data on the result and ensuring the accuracy of the measurement data.

[0021] Furthermore, through the drill rod work control system, the influence of workers' subjective factors can be effectively eliminated, the effective length of three-axis mixing pile construction can be ensured, and the control over cement consumption can be improved.

[0022] Furthermore, since the construction period of each pile is relatively long, the supervisor can call up the pile top elevation, pile bottom elevation and natural ground elevation of each pile at any time during the construction process through the display screen, and check the natural ground elevation passed by the level at any time, effectively ensuring that the pile top elevation and pile bottom elevation of the pile meet the design specifications.

[0023] In the utility model, workers in the worker operating room 1 can measure the distance A through the laser distance measuring sensor 5 and the laser sensor fixed angle steel 4. The distance between the bottom of the protective tube 8 and the natural ground is a fixed value B (the height of the pile driver platform). The total length of the drill rod C is input on the input display screen 2, and the actual depth of penetration into the soil layer is CAB (when A+B≤C, the drill rod begins to enter the soil, unit: m). Four parameters are input on the input display screen 2: the total length of the drill rod, the natural ground elevation, the pile top elevation, and the pile bottom elevation. The length of the drill rod extending into the pile top is converted by the single chip 3 = the natural ground elevation - the pile top elevation. At this time, when the laser distance measuring sensor 5 reads A, the drill rod work control system stored in the single chip 3 issues a command, and the drill bit starts to spray and stir. The length of the drill rod extending into the pile bottom is converted by the single chip 3 = natural ground elevation - pile bottom elevation. At this time, when the laser distance sensor 5 reads A, the drill rod work control system stored in the single chip 3 issues a command, and the drill bit starts to rise (the three axes determine whether to perform manual re-spraying and re-mixing based on the on-site pile test situation, and the re-mixing depth can be read through the pile head elevation on the display screen, where the drill head elevation displayed on the input display screen 2 = natural ground elevation - C + A + B). The actual construction parameters of each pile are stored in the single chip 3 and can be retrieved at any time.

[0024] The specific process of using this device is as follows:

[0025] Use a level to measure the natural ground elevation of the area where construction is required;

[0026] According to the drawing requirements and the actual pile driver selection, enter the total length of the drill rod, natural ground elevation, pile top elevation, and pile bottom elevation in the input display (when constructing the same type of pile, you only need to pay attention to modifying the natural ground elevation parameter);

[0027] The drill rod working control system in the single chip microcomputer is used to automatically control the pile driver to start spraying and drilling rod lifting;

[0028] When verifying the pile top elevation, call up the data in the single-chip microcomputer to verify the natural ground elevation.

[0029] As above, although the utility model has been shown and described with reference to a specific preferred embodiment, it should not be interpreted as limiting the utility model itself. Various changes can be made to it in form and detail without departing from the spirit and scope of the utility model defined in the attached claims.

Claims

1. A device for controlling the effective length of a three-axis mixing pile and a triple high-pressure jet grouting pile, characterized in that: It includes an input display screen and a power head on the top of the drill rod. Several laser distance measuring sensors are installed on the upper part of the power head on the top of the drill rod. A single-chip microcomputer and a control system are arranged between the laser distance measuring sensors. The laser distance measuring sensors are first connected to the single-chip microcomputer and finally connected to the input display screen through the laid electrical connection line. Through the drill rod control system, when the laser reaches the pile top elevation, the drill rod starts to spray and stir the surrounding soil. When the drill rod reaches the pile bottom elevation, the drill rod is lifted.

2. The effective pile length control device for a three-axis mixing pile and a triple high-pressure jet grouting pile according to claim 1, characterized in that: The laser ranging sensor is fixed to the power head at the top of the drill pipe through a fixed angle steel, with one group at each end of the power head. A vibration reduction protection tube is provided at the lower part of the drill pipe, and a laser reflection angle steel is fixed on the vibration reduction protection tube. The laser emitted by the laser ranging sensor is aligned with the laser reflection angle steel.

3. The effective pile length control device for a three-axis mixing pile and a triple high-pressure jet grouting pile according to claim 2, characterized in that: The data input into the display screen is processed by the single chip microcomputer to control the depth of the drill rod lifting or sinking.

4. The effective pile length control device for a three-axis mixing pile and a triple high-pressure jet grouting pile according to claim 3, characterized in that: There are four data input into the display screen: total length of drill rod, pile top elevation, pile bottom elevation, and natural ground elevation. There are five data that can be read from the display screen: total length of drill rod, pile top elevation, pile bottom elevation, natural ground elevation, and pile head elevation.

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