A deviation correction method for long-distance curved pipe jacking projects in open areas

Abstract

A deviation correction method for a long-distance curved pipe jacking project in an open area relates to a pipe jacking deviation correction process, comprising the steps of drawing a culvert track contour line, selecting monitoring points, excavating monitoring wells, setting equidistant points, excavating vertical shafts, excavating monitoring holes, installing a distance meter, and monitoring the pipe jacking excavation accuracy using the distance meter. The present invention overcomes the disadvantage that traditional pipe jacking methods easily cause deviations in the excavation route during long-distance curved pipe jacking underground, thereby affecting the overall construction quality and progress.

Description

Technical Field

[0001] The invention relates to a pipe jacking correction process, in particular to a pipe jacking engineering correction method for long-distance curved pipe jacking in an open area. Background Art

[0002] Pipe jacking, a method of underground pipeline construction developed after shield tunneling, requires no surface excavation and can traverse roads, railways, rivers, surface buildings, underground structures, and various underground pipelines. Pipe jacking utilizes the thrust of a main jacking cylinder and pipe rooms and relay rooms to push the tool pipe or tunnel boring machine from the working shaft through the soil and into the receiving shaft for hoisting. Simultaneously, the pipeline following the tool pipe or tunnel boring machine is buried between the two shafts, achieving a trenchless underground pipeline construction method. Advantages include minimal or no impact on the surrounding environment, a small construction site, and low noise levels.

[0003] When a tunnel boring machine (TBM) is performing pipe jacking operations deep underground, the various detection instruments used to control tunneling accuracy are unable to accurately calibrate the tunneling route in real time due to the obstruction of the strata. During straight tunneling, this can be avoided by simply adjusting the machine head position. However, during long-distance curved tunnel jacking, if the tunneling route deviates, adjustments can be made by adjusting tunneling parameters if discovered within a short distance. However, once the tunneling distance is too long and the deviation is too large, it becomes difficult to make adjustments, directly affecting the overall construction quality and progress, resulting in irreparable economic losses. Summary of the Invention

[0004] In order to overcome the shortcomings of the background technology, the present invention discloses a method for correcting long-distance curved pipe jacking projects in open ground. The method comprises the following steps: drawing a culvert trajectory outline on the open ground above the long-distance curved pipe jacking project, selecting a suitable point on the center line of the culvert trajectory to excavate a monitoring well, excavating vertical shafts at equidistant points on both sides of the culvert trajectory, and excavating a monitoring hole passing through the monitoring well between the two vertical shafts. The accuracy of the pipe jacking excavation is monitored by using rangefinders at the wellheads of the monitoring wells and at the bottoms of the two vertical shafts. This overcomes the disadvantage that traditional pipe jacking methods are prone to cause deviations in the excavation route, affecting the overall construction quality and progress, when jacking long-distance curved pipes underground.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] A method for correcting deviation of a long-distance curved pipe jacking project in an open area, comprising the following steps:

[0007] Step 1: Draw the culvert track outline: When performing long-distance curved pipe jacking on an open ground, draw the culvert outline on the open ground directly above the pre-jacking pipe according to the actual culvert laying projection track;

[0008] Step 2: Select monitoring points: Draw the culvert center projection line within the area enclosed by the culvert outline according to the orthographic projection of the culvert center position, and select multiple monitoring points on the culvert center projection line according to monitoring needs;

[0009] Step 3: Excavate monitoring wells: At each monitoring point, vertically excavate monitoring wells along the soil layer to the center of the culvert according to the actual culvert outline;

[0010] Step 4: Set equidistant points: Set equidistant points on the culvert cross-section plane on both sides of the culvert outline with each monitoring point as the symmetry center.

[0011] Step 5: Excavate vertical shafts: Excavate vertical shafts along the soil layer at each equidistant point to the actual project depth;

[0012] Step 6: Excavation of monitoring holes: dig a horizontal monitoring hole between the two bottoms of each set of vertical shafts through the center of the culvert along the soil layer so that the vertical shafts, monitoring wells and monitoring holes here form a "mountain" shaped monitoring station;

[0013] Step 7: Install the distance meter: A distance meter A pointing to the actual culvert laying center is installed at the wellhead of each monitoring well, and a distance meter B pointing to the culvert center is installed at the bottom of the two vertical shafts at both ends of each monitoring hole;

[0014] Step 8. Use distance meters to monitor the accuracy of pipe jacking excavation: During the pipe jacking process, the culvert will be monitored by the set of distance meters when it passes through each "mountain"-shaped monitoring station. Once the measurement results of the three distance meters in this group exceed the floating range, it means that the head of the pipe jacking machine has deviated. The measurement data can be used to correct the deviation of the head in time.

[0015] In the deviation correction method for long-distance curved pipe jacking projects in open areas, the monitoring points in step 2 are selected so that the distance between the monitoring points is slightly wider when the projection line of the center of the culvert is a straight line. When the projection line of the center of the culvert is at a curved position, the density of the monitoring points is appropriately increased.

[0016] In the deviation correction method for a long-distance curved pipe jacking project in an open area, the shape of the monitoring well in step three is circular; or square.

[0017] In the deviation correction method for a long-distance curved pipe jacking project in an open ground, the shape of the vertical shaft in step five is circular; or square.

[0018] In the deviation correction method for a long-distance curved pipe jacking project in an open area, the shape of the monitoring hole in step six is circular; or square.

[0019] In the deviation correction method for a long-distance curved pipe jacking project on an open ground, both the rangefinder A and the rangefinder B in step seven are laser rangefinders.

[0020] In the deviation correction method for a long-distance curved pipe jacking project in an open area, each distance meter A and each distance meter B in step seven are connected to a switch and a power supply respectively.

[0021] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0022] The deviation correction method for long-distance curved pipe jacking projects in open ground described in the present invention draws the contour line of the culvert trajectory on the open ground above the long-distance curved pipe jacking, selects a suitable point on the center line of the culvert trajectory to dig a monitoring well, digs vertical shafts at equidistant points on both sides of the culvert trajectory, and digs monitoring holes passing through the monitoring wells between the two vertical shafts. The accuracy of the pipe jacking excavation is monitored by using rangefinders at the wellheads of the monitoring wells and at the bottoms of the two vertical shafts, thereby overcoming the disadvantage that traditional pipe jacking methods are prone to cause deviations in the excavation route and affect the overall construction quality and progress when jacking long-distance curved pipes underground. The structure of the present invention is simple to construct, easy to operate, and highly practical, can effectively improve work efficiency, solves long-standing problems, and has great market promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the construction steps of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the present invention when the rangefinder is not installed;

[0025] Figure 3 It is a cross-sectional schematic diagram of the present invention.

[0026] In the figure: 1. Culvert outline; 2. Culvert center projection line; 3. Vertical shaft; 4. Monitoring hole; 5. Monitoring well; 6. Culvert curve position; 7. Ground; 8. Soil layer; 9. Distance meter A; 10. Distance meter B; 11. Culvert center position; 12. Actual culvert outline. Implementation Method

[0027] The present invention can be explained in more detail by the following examples. The present invention is not limited to the following examples. The purpose of the disclosure is to protect all changes and improvements within the scope of the present invention.

[0028] Combined with attachment Figures 1 to 3 The deviation correction method for a long-distance curved pipe jacking project on an open ground comprises the following steps:

[0029] Step 1: Draw the culvert track outline: When performing long-distance curved pipe jacking on an open ground, draw the culvert outline 1 on the open ground 7 directly above the pre-jacking pipe according to the actual culvert laying projection track;

[0030] Step 2: Select monitoring points: Draw a culvert center projection line 2 within the area enclosed by the culvert outline line 1 based on the orthographic projection of the culvert center position 11. Select multiple monitoring points on the culvert center projection line 2 based on monitoring needs. In step 2, the distance between monitoring points is slightly wider when the culvert center projection line 2 is a straight line. When the culvert center projection line 2 is a curved line at the culvert curve position 6, the density of monitoring points is appropriately increased.

[0031] Step 3: Excavate monitoring wells: At each monitoring point, vertically excavate monitoring wells 5 along the soil layer 8 to the culvert center position 11 of the actual culvert outline 12. In step 3, the shape of the monitoring wells 5 is circular; or square;

[0032] Step 4: Set equidistant points: Set equidistant points on the culvert cross-sectional plane on both sides of the culvert outline 1 with each monitoring point as the symmetry center.

[0033] Step 5: Excavate vertical shafts: vertically excavate vertical shafts 3 along the soil layer 8 at each equidistant point to the actual project depth. The shape of the vertical shafts 3 in step 5 is circular or square.

[0034] Step 6: Excavation of monitoring holes: Dig a horizontal monitoring hole 4 between the bottoms of the two shafts of each group of vertical shafts 3 through the center position 11 of the culvert and along the soil layer 8 so that the vertical shafts 3, monitoring wells 5 and monitoring holes 4 here form a "mountain"-shaped monitoring station. The shape of the monitoring hole 4 in step 6 can be circular; or square;

[0035] Step 7: Install the rangefinders: Install a rangefinder A9 pointing to the actual culvert center at the wellhead of each monitoring well 5. Install a rangefinder B10 pointing to the culvert center 11 at the bottom of the two vertical shafts 3 at both ends of each monitoring hole 4. Both rangefinders A9 and B10 in Step 7 are laser rangefinders. Connect each rangefinder A9 and B10 in Step 7 to a switch and power supply.

[0036] Step 8. Use distance meters to monitor the accuracy of pipe jacking excavation: During the pipe jacking process, the culvert will be monitored by the set of distance meters when it passes through each "mountain"-shaped monitoring station. Once the measurement results of the three distance meters in this group exceed the floating range, it means that the head of the pipe jacking machine has deviated. The measurement data can be used to correct the deviation of the head in time.

[0037] The present invention draws the outline of the culvert trajectory on the open ground above the long-distance curved jacking pipe, selects a suitable point on the center line of the culvert trajectory to dig a monitoring well, digs vertical shafts at equidistant points on both sides of the culvert trajectory, and digs a monitoring hole passing through the monitoring well between the two vertical shafts. The jacking pipe excavation accuracy is monitored by using rangefinders at the wellheads of the monitoring wells and the bottoms of the two vertical shafts. This overcomes the disadvantage that traditional jacking methods are prone to cause deviations in the excavation route during long-distance curved jacking underground, thereby affecting the overall construction quality and progress.

[0038] The parts not described in detail in this invention are prior art.

Claims

1. A method for correcting deviation of a long-distance curved pipe jacking project in an open area, characterized by: The following steps are involved: Step 1: Draw the culvert track outline: When performing long-distance curved pipe jacking on an open ground, draw the culvert track outline (1) on the open ground (7) directly above the pre-jacking pipe according to the actual culvert laying projection track; Step 2: Select monitoring points: Draw a culvert center projection line (2) in the area enclosed by the culvert outline (1) according to the orthographic projection of the culvert center position (11), and select multiple monitoring points on the culvert center projection line (2) according to monitoring needs; Step 3: Excavating monitoring wells: vertically excavating monitoring wells (5) along the soil layer (8) at each monitoring point to the culvert center position (11) of the actual culvert outline (12); Step 4: Set equidistant points: Set equidistant points on both sides of the culvert outline (1) with each monitoring point as the symmetry center on the culvert cross-section plane; Step 5: Excavate vertical shafts: vertically excavate vertical shafts (3) along the soil layer (8) at each equidistant point to the actual project depth; Step 6: Excavation of monitoring holes: dig a horizontally penetrating monitoring hole (4) between the two bottoms of each set of vertical shafts (3) through the center position of the culvert (11) along the soil layer (8) so that the vertical shaft (3), monitoring well (5) and monitoring hole (4) here form a "mountain"-shaped monitoring station; Step 7: Install the distance meter: a distance meter A (9) pointing to the actual culvert laying center is installed at the wellhead of each monitoring well (5), and a distance meter B (10) pointing to the culvert center position (11) is installed at the bottom of the two vertical shafts (3) at both ends of each monitoring hole (4); Step 8. Use distance meters to monitor the accuracy of pipe jacking excavation: During the pipe jacking process, the culvert will be monitored by the set of distance meters when it passes through each "mountain"-shaped monitoring station. Once the measurement results of the three distance meters in this group exceed the floating range, it means that the head of the pipe jacking machine has deviated. The measurement data can be used to correct the deviation of the head in time.

2. The deviation correction method for long-distance curved pipe jacking engineering in open ground according to claim 1 is characterized by: In step 2, the monitoring points are selected such that the distance between the monitoring points is slightly wider when the culvert center projection line (2) is a straight line. When the culvert center projection line (2) at the curved culvert position (6) is encountered, the density of the monitoring points is appropriately increased.

3. The deviation correction method for long-distance curved pipe jacking engineering in an open area according to claim 1 is characterized by: The shape of the monitoring well (5) in step 3 is circular; or square.

4. The deviation correction method for long-distance curved pipe jacking engineering in an open area according to claim 1 is characterized by: In step 5, the shape of the vertical shaft (3) is circular; or square.

5. The deviation correction method for long-distance curved pipe jacking engineering in an open area according to claim 1 is characterized by: The shape of the monitoring hole (4) in step six is circular; or square.

6. The deviation correction method for long-distance curved pipe jacking engineering in an open area according to claim 1 is characterized by: In step seven, both rangefinder A (9) and rangefinder B (10) are laser rangefinders.

7. The deviation correction method for long-distance curved pipe jacking engineering in an open area according to claim 1 is characterized by: Connect each rangefinder A (9) and rangefinder B (10) in step 7 to a switch and a power supply respectively.

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