Positioning method in linear path trenchless construction

Abstract

The invention discloses a positioning method in linear path trenchless construction. In the trenchless construction, a guiding instrument integrated with a global positioning system is used; the method comprises the following steps: 1) sequentially propelling a first drill rod and a second drill rod, finding respective median points of drill bits on the corresponding drill rods in each propelling process, and respectively recording the median points as a first median point and a second median point; (2) the third drill rod continues to be pushed, and the guiding hand finds the current median line; (3) the first median point of the first drill rod and the second median point of the second drill rod obtained in the step (1) are connected to obtain a connecting line, the connecting line serves as an extension line in the direction of the median line, and the intersection point of the extension line and the current median line in the step (2) is marked as a third median point; and (4) after the nth drill rod is propelled, n is larger than or equal to 4, the guiding hand finds the current median line, the connecting line and the extension line of the median point of the (n-2) th drill rod and the median point of the (n-1) th drill rod are drawn, and the obtained intersection point is the median point of the nth drill rod till the propelling record of all the drill rods is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of trenchless drilling, and particularly to a positioning method in trenchless construction of a straight path. Background Art

[0002] A typical trenchless construction site includes a drilling rig, drill pipes, a drill bit, a probe and a guidance instrument. The probe is installed in the probe chamber of the drill bit, and its function is to transmit the position information of the drill bit to the guidance instrument on the ground through electromagnetic principles. The guidance instrument is used by the guide operator on the ground to determine the position of the drill bit underground by finding specific positions.

[0003] The trenchless construction process is completed through the mutual cooperation of the drilling rig operator and the guide operator. Among them, the guide operator uses the guidance instrument to determine the current position of the drill bit, and then determines the way of advancing the drilling rig to achieve the purpose of making the construction line proceed along the planned track.

[0004] To determine the current position of the drill bit underground, the guide operator's method is to first determine the rear point of the drill pipe and make a mark on the ground, such as inserting a small flag, and then find the front point of the drill pipe and also make a mark. Then, according to the indication of the guidance instrument, find the midpoint on the line connecting the two marked points, that is, directly above the drill bit. Directly above the drill bit is the position where the drill bit is located. If it is necessary to record or mark the construction route trajectory, the midpoint is the appropriate position for recording or marking. The positioning method based on this principle can be seen in the Chinese patent with the application number 201410153723.5 disclosed by the applicant.

[0005] Although the midpoint is of interest in construction records, in order to accurately determine the midpoint, the guide operator must determine and mark the positions of the front and rear points, otherwise the midpoint cannot be determined. Sometimes, to reduce the operation steps, in practice, the guide operator also uses the midpoint of the previous drill pipe instead of the current rear point. Therefore, only the current front point needs to be found, and the midpoint is found between the previous midpoint and the current front point.

[0006] Currently, the practice in guiding is to use physical methods to mark the front and rear points, such as inserting flags, spraying paint, etc., and then rely on visual inspection to determine whether the midpoint is on the straight line connecting the front and rear points. This positioning process is not only cumbersome, time-consuming and laborious, but also lacks scientific guarantee and basis for the positioning accuracy.

[0007] To solve the above problems, the applicant's Chinese patent with the application number 202311633889.2 proposed a method that can simplify operations and accurately locate. After the advancement of one drill pipe is completed, it is necessary to first determine the front point and the rear point of the current carbon rod, make digital marks and records, and further determine the intersection point of the line connecting the front and rear points and the median line of the guidance instrument, so as to determine the midpoint of the current carbon rod. However, since this kind of positioning still requires finding the front point and the rear point, the actual operation is still not simple enough. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a positioning method in trenchless construction of a straight path, which can simplify operations and accurately locate, aiming at the deficiencies in the above-mentioned existing technologies.

[0009] The technical solution adopted by the present invention to solve the above technical problems is as follows: A positioning method in trenchless construction of a straight path, wherein the trenchless construction uses a guidance instrument integrated with a global positioning system; it is characterized in that:

[0010] 1) After sequentially advancing the first drill pipe and the second drill pipe, each time of advancement finds the midpoints of the respective drill bits on the corresponding drill pipes, which are respectively recorded as the first midpoint and the second midpoint;

[0011] 2) Then continue to advance the third drill pipe, and the guiding operator finds the current median line;

[0012] 3) Using the first midpoint of the first drill pipe and the second midpoint of the second drill pipe obtained in step 1), connect these two points to obtain a connection line, and make an extension line of the connection line in the direction of the median line. The intersection point of the extension line and the current median line in step 2) is recorded as the third midpoint;

[0013] 4) And so on, after advancing the nth drill pipe, where n≥4, the guiding operator finds the current median line, makes a connection line between the midpoint of the (n - 2)th drill pipe and the midpoint of the (n - 1)th drill pipe, and then makes an extension line of the connection line between the midpoint of the (n - 2)th drill pipe and the midpoint of the (n - 1)th drill pipe in the direction of the current median line. The intersection point thus obtained is the midpoint of the nth drill pipe, until the records of the advancement of all drill pipes are completed.

[0014] Using the median line of the conventional guidance instrument and combining with the previously recorded midpoints, directly determine the current midpoint. After the guiding operator finds the median line, there is no need to move around extensively to find the front point and the rear point, which saves time and effort and has accurate positioning.

[0015] Preferably, the calculation of the guidance instrument is completed by a computer or a mobile phone.

[0016] Preferably, each midpoint is recorded as GPS data.

[0017] Compared with the prior art, the advantages of the present invention are as follows: By using the median line of a conventional guiding instrument and combining the previously recorded midpoints, the current midpoint can be directly determined. After the guiding operator finds the median line, there is no need to move extensively to find the front and rear points, which saves time and effort and ensures accurate positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the principle of the positioning method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the disclosed embodiments of the present invention can be arranged in different directions, these terms indicating directions should only be regarded as illustrative and not restrictive. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0021] Referring to Figure 1 , a positioning method in trenchless construction of a straight path uses a digital marking method to replace the current physical marking and visual determination of the midpoint method, so as to achieve the purpose of simplifying the operation and accurately positioning.

[0022] The key to using digital marking is to use a precise GPS or Beidou positioning system (i.e., the Global Positioning System). It is necessary to integrate the Global Positioning System into the guiding instrument. This technology is the prior art and can be referred to in the Chinese patents disclosed by the applicant with application numbers 202010251387.3, 202010251440.X, etc.

[0023] The positioning method of the present invention is mainly used during the construction of a straight path and is also the digital marking method as described in the applicant's prior application in the background art. Specifically, it includes the following steps:

[0024] 1) Find the midpoints of the first drill pipe and the drill bit on the second drill pipe (with a probe inside the drill bit) respectively according to the existing conventional method (manually determined by the guiding operator), and record them as the first midpoint H1 and the second midpoint H2 respectively, and record them in the system of the guiding instrument in a unified format, such as GPS data (EGS84 international standard); because they are the first two points with small depth and even visible, they are relatively easy to determine and the accuracy can be guaranteed;

[0025] 2) Then continue to push the third drill pipe, and the guiding operator uses the existing guiding instrument described above to find the current median line M1 in the existing conventional manner;

[0026] 3) Use the first midpoint H1 of the first drill pipe and the second midpoint H2 of the second drill pipe obtained in step 1), connect these two points to get the connecting line M2, and extend the connecting line M2 in the direction of the median line M1 to get the extension line M2'. The intersection point of the extension line M2' and the current median line M1 in step 2) is the midpoint of the probe on the current third drill pipe, which is recorded as the third midpoint H3 and recorded in the system of the guiding instrument;

[0027] 4) Continue to push the 4th drill pipe, and use the second midpoint H2 and the third midpoint H3 to obtain the current midpoint in the same way as obtaining the third midpoint H3, that is, obtain the fourth midpoint; and so on. When pushing the nth drill pipe, where n≥4, the guiding operator uses the guiding instrument to find the current median line according to the conventional method, make the connecting line and its extension line of the midpoint of the (n - 2)th drill pipe and the midpoint of the (n - 1)th drill pipe, and the intersection point of the extension line and the median line is the current midpoint, that is, obtain the midpoint of the probe on the nth drill pipe until the recording of the pushing of all drill pipes is completed.

[0028] The calculation and user interface of the guiding instrument can be completed using a general computer or mobile phone (such as the Android system).

[0029] The recording formats of all midpoints are unified, and the unified format is also used during calculation.

[0030] Although the positioning method of the present invention is used for straight-line path construction, even on a construction path with a curvature, this positioning method can also be used to narrow the range of the midpoint and can also provide a good reference for the guiding operator.

Claims

1. A positioning method in trenchless construction of a straight path, wherein the trenchless construction uses a guidance instrument integrated with a global positioning system; characterized in that: 1) After the first drill rod and the second drill rod are pushed forward in sequence, the midpoints of the drill bits on the corresponding drill rods are found each time, which are recorded as the first midpoint (H1) and the second midpoint (H2) respectively; 2) Then continue to push the third drill rod, and the guide hand finds the current midline (M1); 3) Using the first midpoint (H1) of the first drill pipe and the second midpoint (H2) of the second drill pipe obtained in step 1), these two points are connected to obtain a line (M2), and the line (M2) is extended in the direction of the midpoint (M1) as an extension line (M2'), and the intersection of the extension line (M2') and the current midpoint (M1) in step 2) is recorded as the third midpoint (H3); 4) Similarly, after advancing the nth drill rod, where n≥4, the guide hand finds the current midline, draws a line connecting the midpoints of the n-2th drill rod and the n-1th drill rod, and then draws an extension line of the line connecting the midpoints of the n-2th drill rod and the n-1th drill rod in the direction of the current midline. The intersection point thus obtained is the midpoint of the nth drill rod, until the record of advancing all drill rods is completed.

2. The method for locating the midpoint of trenchless construction according to claim 1, characterized in that: The calculation of the guide instrument is completed through a computer or mobile phone.

3. The method for locating the midpoint of trenchless construction according to claim 1, characterized in that: Each median point is recorded as GPS data.

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