CN108331968B - Corner compensation construction method for large-caliber large-curvature jacking pipe - Google Patents
Corner compensation construction method for large-caliber large-curvature jacking pipe Download PDFInfo
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- CN108331968B CN108331968B CN201810367893.1A CN201810367893A CN108331968B CN 108331968 B CN108331968 B CN 108331968B CN 201810367893 A CN201810367893 A CN 201810367893A CN 108331968 B CN108331968 B CN 108331968B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a corner compensation construction method for a large-caliber large-curvature jacking pipe, which comprises the following steps of: 1) construction preparation; 2) extending the right deviation rectifying jack; 3) welding channel steel; 4) retracting the right deviation rectifying jack; 5) plugging a steel plate; 6) closing the gap; 7) and (4) dismantling the channel steel. The construction method has the advantages that the construction method has the characteristics of strong construction continuity, short construction period, less construction equipment, small influence on the surrounding environment, less pollution and the like; the method has the advantages of greatly improving safety guarantee, engineering quality, construction period control, energy conservation, environmental protection, labor protection and the like, and having obvious economic and social benefits.
Description
Technical Field
The invention relates to the technical field of pipeline construction, in particular to a corner compensation construction method for a large-caliber large-curvature jacking pipe.
Background
The large-caliber large-curvature curve pipe jacking construction is an important project in pipe jacking projects, at present, a relay adjusting mode is usually adopted in the construction process, and the hydraulic adjustment is carried out on the rotation angle of the pipe jacking through the relay of a pipe jacking machine; but the adjustable deflection degree of the relay is generally less than 0.2 degrees, the single side of the relay is easy to deform under stress and leak slurry, the construction period is long, and the adjusted deflection angle is difficult to maintain unchanged; the pipe jacking project is usually affected by different geographic environments, and the adjusting range of the pipe jacking in the prior art cannot meet the installation requirements of different geographic environments, so that the whole construction process and the construction quality are affected.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a safe and reliable large-caliber large-curvature jacking pipe corner compensation construction method with short construction period.
The technical scheme of the invention is as follows:
the large-caliber large-curvature pipe jacking corner compensation construction method is characterized by comprising the following steps of:
1) construction preparation: hoisting the pipe jacking machine to go down the well, installing a mud discharging system of the pipe jacking machine and a hydraulic system of a jack, and starting pipe jacking;
2) extension of the right deviation rectifying jack: after a cutter head of the push bench passes a starting curve point by 4-6m, a compensation corner is set; slowly extending the right deviation rectifying jacks of the push bench, and simultaneously extending the upper and lower groups of deviation rectifying jacks on the right side to enable the front section of the push bench to deflect leftwards and form a corner with the rear section of the push bench;
3) welding channel steel: respectively arranging a channel steel at the position 1.2-1.8m away from the upper part and the lower part of the right side of the first section of pipe, inserting one end of the channel steel into a gap between the rear section of the pipe jacking machine and the first section of pipe, and welding and fixing; the other end of the channel steel is welded and fixed on a breast board at the front section of the push bench, and the front section of the push bench and a first section of pipe are connected into a whole through an upper channel steel and a lower channel steel;
4) retracting the right deviation rectifying jack: after the channel steel welding seam is cooled, the upper and lower groups of deviation rectifying jacks on the right side of the push bench are slowly contracted, the rear section of the push bench is closed to the front section, a corner is formed between the rear section of the push bench and the first section of pipe, and when the corner reaches the maximum opening amount, the contraction of the deviation rectifying jacks on the right side of the push bench is stopped;
5) plugging a steel plate: firstly inserting an arc-shaped steel plate into a gap between the rear section of the push bench and the first section of pipe, and fixing two ends and the middle position of the arc-shaped steel plate with a steel sleeve of the first section of pipe respectively in a spot welding mode; then inserting the square steel plate into a gap between the arc-shaped steel plate and the rear section of the push bench, and welding and fixing;
6) closing the gap: after the steel plate is plugged, slowly extending a deviation rectifying jack at the right side of the push bench to gradually draw the rear section of the push bench and the first section of pipe together, so that a gap between the rear section of the push bench and the first section of pipe is closed, and the steel plate is compressed;
7) and (4) dismantling the channel steel.
The large-caliber large-curvature pipe jacking corner compensation construction method is characterized in that when the extension resistance of the right deviation rectifying jack in the step 2) is too large, the pressure of a muddy water bin in a pipe jacking machine head can be temporarily reduced.
The large-caliber large-curvature pipe jacking corner compensation construction method is characterized in that a steel plate is welded at one end of the channel steel in the step 3) to form a T-shaped socket, and full welding is required when the T-shaped socket is welded, so that the strength of the T-shaped socket is ensured; one end of the channel steel with the T-shaped socket is inserted into a gap between the rear section of the push bench and the first section of pipe, and the channel steel is enabled to be parallel to the push bench and the first section of pipe respectively.
The large-caliber large-curvature pipe jacking corner compensation construction method is characterized in that in the step 4), the right deviation rectifying jack retracts slowly to prevent damage to the first section of pipe and damage to the water-stop rubber ring, a gap between the rear section of the pipe jacking machine and the first section of pipe is checked, and slurry leakage is prevented.
The large-caliber large-curvature pipe jacking corner compensation construction method is characterized in that in the step 5), the thickness of the square steel plate is 8-12mm, the square steel plate is uniformly arranged at the upper position, the lower position and the middle position of the arc steel plate, the square steel plate is firmly welded with the arc steel plate in a spot welding mode, and a loose position is filled with a sheet iron.
The large-caliber large-curvature jacking pipe corner compensation construction method is characterized in that the channel steel dismantling method in the step 7) comprises the following steps: when the channel steel is dismantled, the dismantling sequence is that the channel steel is dismantled from top to bottom, and a T-shaped socket of the channel steel is wound and fixed by an iron wire to prevent the channel steel from unstably falling after being cut; and after cutting, supporting at two ends of the channel steel at the same time, slowly removing the iron wires, and slowly taking down the channel steel.
The invention has the beneficial effects that:
1) the effective adjustment of the deflection angle of the first section of pipe is realized by arranging the channel steel between the front section of the pipe jacking machine and the first section of pipe and by the deviation correcting jack between the front section of the pipe jacking machine and the rear section of the pipe jacking machine, the adjustment precision of the deflection angle is high, the adjustment range is large and can reach 1.8 degrees at most, the pipe jacking machine is rigidly connected with the first section of pipe, and the annular stress is uniform; the air tightness is better in the adjusting process.
2) The construction method has the characteristics of strong construction continuity, short construction period, less construction equipment, small influence on the surrounding environment, less pollution and the like; the method has the advantages of greatly improving safety guarantee, engineering quality, construction period control, energy conservation, environmental protection, labor protection and the like, and having obvious economic and social benefits.
Drawings
FIG. 1 is an initial state diagram of the present invention;
FIG. 2 is a diagram of the extension state of the right deviation rectifying jack of the present invention;
FIG. 3 is a schematic view of the front side of the channel steel installation of the present invention;
FIG. 4 is a schematic view of a top view of the channel assembly of the present invention;
FIG. 5 is a drawing of the retraction state of the right side correction jack of the present invention;
FIG. 6 is a schematic structural view of a plugged steel plate according to the present invention;
FIG. 7 is a flow chart of the construction of the present invention;
in the figure: 1-front section of pipe jacking machine, 2-rear section of pipe jacking machine, 3-first section pipe, 4-deviation-rectifying jack, 5-steel sleeve, 6-channel steel, 7-T-shaped socket, 8-arc steel plate and 9-square steel plate.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1-7, the large-caliber large-curvature pipe jacking corner compensation construction method comprises a pipe jacking machine front section 1, a pipe jacking machine rear section 2, a first section pipe 3, a deviation rectifying jack 4, a steel sleeve 5, a channel steel 6, a T-shaped socket 7, an arc-shaped steel plate 8 and a square steel plate 9.
Example (b):
the large-caliber large-curvature pipe jacking corner compensation construction method specifically comprises the following steps:
1) construction preparation: installing a guide rail and a rear backrest in a working well, well performing measurement lofting before construction, controlling the height of the guide rail to be equal to the height of a tunnel portal, adjusting the position of a steel seal door of the rear backrest to be parallel to the tunnel portal, and pouring concrete; a hole door is initially broken, and a water stop flange and a double-layer water stop rubber ring are arranged on a hole door ring; installing an internal connecting guide rail in the hole door, and butting the internal connecting guide rail with the guide rail in the working well; hoisting the pipe jacking machine to descend the well and placing the pipe jacking machine on the guide rail, wherein the pipe jacking machine is close to the portal as much as possible; installing a jack and a jack bracket, and fixing the jack and the jack bracket with a steel sealing door of a rear backrest; and a mud discharging system of the push bench and a hydraulic system of the jack are installed, so that a tunnel portal is further broken, and the push bench starts.
2) Extension of the right deviation rectifying jack 4: after a cutter head of the push bench passes a curve starting point by 5m, a compensation corner is set; slowly extending a right deviation rectifying jack 4 of the push bench, and simultaneously extending an upper group of deviation rectifying jacks 4 and a lower group of deviation rectifying jacks 4 on the right side by 50mm, so that the front section 1 of the push bench deflects leftwards and forms a corner with the rear section 2 of the push bench; when the extension resistance of the right deviation rectifying jack 4 is too large, the pressure of the muddy water bin in the head of the push bench can be temporarily reduced.
3) Welding a channel steel 6: respectively arranging a channel steel 6 (adopting 100X 48X 5.3X 8.5 # channel steel with the length of 4 m) at the position 1.5m away from the upper and lower sides of the right side of the first-section pipe 3, and inserting one end of the channel steel 6 into a gap between the rear section 2 of the pipe jacking machine and the first-section pipe 3 and welding and fixing the channel steel; the other end of the channel steel 6 is welded and fixed on a breast board of the front section 1 of the push bench, and the front section 1 of the push bench and the first section of the pipe 3 are connected into a whole through the upper channel steel 6 and the lower channel steel 6; one end of the channel steel 6 is welded with a steel plate to form a T-shaped socket 7, and full welding is needed when the T-shaped socket 7 is welded, so that the strength of the T-shaped socket 7 is ensured; one end of the channel steel 6 with the T-shaped socket 7 is inserted into a gap between the rear section 2 of the push bench and the first section pipe 3, and the channel steel 6 is kept parallel to the push bench and the first section pipe 3 respectively.
4) Retracting the right deviation rectifying jack 4: after the welding seam of the channel steel 6 is cooled, the upper and lower groups of deviation rectifying jacks 4 on the right side of the push bench are slowly contracted, so that the rear section 2 of the push bench is closed to the front section to form a corner with the first section of pipe 3, and when the maximum opening amount of the corner reaches 25mm, the contraction of the deviation rectifying jacks 4 on the right side of the push bench is stopped; before retraction, checking whether the channel steel is welded firmly and stably; the right deviation rectifying jack 4 slowly retracts in the retraction process, the first section of pipe 3 is prevented from being damaged, the water stop rubber ring is prevented from being damaged, the gap between the rear section 2 of the pipe jacking machine and the first section of pipe 3 is checked, and slurry leakage is prevented.
5) Plugging a steel plate: firstly inserting an arc-shaped steel plate 8 into a gap between the rear section 2 of the push bench and the first section of pipe 3, and fixing two ends and the middle position of the arc-shaped steel plate 8 with a steel sleeve 5 of the first section of pipe 3 respectively in a spot welding mode; then inserting the square steel plate 9 into the gap between the arc-shaped steel plate 8 and the rear section 2 of the push bench, and welding and fixing; the thickness of the square steel plate 9 is 10mm, the square steel plate is uniformly arranged at the upper, lower and middle positions of the arc-shaped steel plate 8, the square steel plate is firmly welded with the arc-shaped steel plate 8 in a spot welding mode, and a loose position is filled with a sheet iron; the specification of the steel plate is as follows: arc steel plates (15 x 400 x 280 mm), square steel plates (10 x 400 x 280 mm) and rectangular tinplate (5 x 400 x 140 mm).
6) Closing the gap: after the steel plate is plugged, the right deviation rectifying jack 4 of the push bench is slowly extended to gradually draw the rear section 2 of the push bench and the first section of pipe 3 together, so that the gap between the two is closed, and the steel plate is compressed.
7) Dismantling the channel steel 6; the method for dismantling the middle channel steel 6 comprises the following steps: when the channel steel 6 is dismantled, the dismantling sequence is that the channel steel 6 is dismantled from top to bottom, and the T-shaped socket 7 of the channel steel 6 is wound and fixed by an iron wire to prevent the channel steel 6 from unstably falling after being cut; when the cutting is finished, the two ends of the channel steel 6 are simultaneously supported, the iron wires are slowly removed, and the channel steel 6 is slowly taken down.
Compared with the conventional curve pipe jacking construction method, the construction method is successfully applied in the pipe jacking process, has the advantages of simple operation, no need of additionally arranging special pipe joints and the like, greatly saves the construction period and the cost, saves the mechanical equipment investment by 50000 yuan, saves the manpower investment of 100 meters per jacking on average by 18000 yuan, saves the construction period by 6 days, saves the bentonite material by 22000 yuan, and saves the total investment of 100 meters per jacking on average by 90990 yuan. The economic benefits of the QC method when the QC method is used for jacking 100 meters per jack are compared with those of the conventional construction method and are shown in the table 1.
Table 1:
as shown in Table 2, through comparison of test detection statistical data, when the deflection angle is adjusted to be 0.34 degrees, the comprehensive air tightness of the first section of pipe is 0.017MPa which is greater than the water and soil pressure of an original soil layer by the method, the pipe seam leakage phenomenon is not seen in the experimental process, the jacking axis control requirement can be met, the construction period is short, and the construction process is greatly improved.
Table 2:
the method has the characteristics of strong construction continuity, short construction period, less construction equipment, small influence on the surrounding environment, less pollution and the like; the method has the advantages of greatly improving safety guarantee, engineering quality, construction period control, energy conservation, environmental protection, labor protection and the like, and having obvious economic and social benefits.
Claims (6)
1. The large-caliber large-curvature pipe jacking corner compensation construction method is characterized by comprising the following steps of:
1) construction preparation: hoisting the pipe jacking machine to go down the well, installing a mud discharging system of the pipe jacking machine and a hydraulic system of a jack, and starting pipe jacking;
2) extending the right deviation rectifying jack (4): after a cutter head of the push bench passes a starting curve point by 4-6m, a compensation corner is set; slowly extending a right deviation rectifying jack (4) of the push bench, and simultaneously extending an upper group of deviation rectifying jacks (4) and a lower group of deviation rectifying jacks (4) on the right side, so that the front section (1) of the push bench deflects leftwards and forms a corner with the rear section (2) of the push bench;
3) welding channel steel (6): respectively arranging a channel steel (6) at the position 1.2-1.8m away from the upper part and the lower part of the right side of the first section pipe (3), inserting one end of the channel steel (6) into a gap between the rear section (2) of the push bench and the first section pipe (3), and welding and fixing; the other end of the channel steel (6) is welded and fixed on a breast board of the front section (1) of the push bench, and the front section (1) of the push bench and the first section pipe (3) are connected into a whole through the upper channel steel (6) and the lower channel steel (6);
4) the right deviation rectifying jack (4) retracts: after the welding seam of the channel steel (6) is cooled, the upper and lower groups of deviation rectifying jacks (4) on the right side of the push bench are slowly contracted, the rear section (2) of the push bench is closed to the front section, a corner is formed between the rear section and the first section of pipe (3), and when the corner reaches the maximum opening amount, the contraction of the right deviation rectifying jacks (4) of the push bench is stopped;
5) plugging a steel plate: firstly inserting an arc-shaped steel plate (8) into a gap between the rear section (2) of the push bench and the first section of pipe (3), and fixing two ends and the middle position of the arc-shaped steel plate (8) with a steel sleeve (5) of the first section of pipe (3) respectively in a spot welding mode; then inserting the square steel plate (9) into a gap between the arc-shaped steel plate (8) and the rear section (2) of the push bench, and welding and fixing;
6) closing the gap: after the steel plate is plugged, slowly extending a deviation rectifying jack (4) on the right side of the push bench to gradually draw the rear section (2) of the push bench and the first section pipe (3) together, so that a gap between the two is closed, and the steel plate is compressed;
7) and (4) dismantling the channel steel (6).
2. The large-caliber large-curvature pipe jacking corner compensation construction method according to claim 1, wherein when the extension resistance of the right deviation rectifying jack (4) in the step 2) is too large, the pressure of a mud bin in a pipe jacking machine head can be temporarily reduced.
3. The large-caliber large-curvature pipe jacking corner compensation construction method according to claim 1, wherein a steel plate is welded at one end of the channel steel (6) in the step 3) to form the T-shaped socket (7), and full welding is required when the T-shaped socket (7) is welded to ensure the strength of the T-shaped socket (7); one end of the channel steel (6) with the T-shaped socket (7) is inserted into a gap between the rear section (2) of the push bench and the first section pipe (3), and the channel steel (6) is kept parallel to the push bench and the first section pipe (3) respectively.
4. The large-caliber large-curvature pipe jacking corner compensation construction method according to claim 1, wherein in the step 4), the right deviation rectifying jack (4) is slowly retracted in the retraction process, so that damage to the first section pipe (3) and damage to a water-stop rubber ring are prevented, a gap between the rear section (2) of the pipe jacking machine and the first section pipe (3) is checked, and slurry leakage is prevented.
5. The large-caliber large-curvature pipe jacking corner compensation construction method according to claim 1, wherein in the step 5), the thickness of the square steel plate (9) is 8-12mm, the upper position, the lower position and the middle position of the arc steel plate (8) are respectively provided with one square steel plate, the square steel plate and the arc steel plate (8) are welded firmly in a spot welding mode, and a loose position is filled with a sheet iron.
6. The large-caliber large-curvature pipe jacking corner compensation construction method according to claim 3, wherein in the step 7), the channel steel (6) is removed: when the channel steel (6) is dismantled, the dismantling sequence is that the channel steel (6) is dismantled from top to bottom, and the T-shaped socket (7) of the channel steel (6) is wound and fixed by an iron wire to prevent the channel steel (6) from being unstably dropped after being cut; and after cutting, supporting at two ends of the channel steel (6) at the same time, slowly removing the iron wires, and slowly taking down the channel steel (6).
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| JPH0853992A (en) * | 1994-08-10 | 1996-02-27 | Showa Doboku Kk | Curve propulsion device |
| CN1133839C (en) * | 2001-07-27 | 2004-01-07 | 卢清国 | Resistance increasing automatic drive conduit jacking method between pipe and soil and its jacking device |
| JP4520495B2 (en) * | 2007-10-30 | 2010-08-04 | 誠 植村 | Open shield method and open shield machine used for it |
| CN201382206Y (en) * | 2009-04-15 | 2010-01-13 | 深圳市市政工程总公司 | Jacking pipe rectifying structure of FRPM pipe |
| CN102072359B (en) * | 2009-11-24 | 2014-12-10 | 上海市政工程设计研究总院 | Curved-jacked steel pipe section and jacking method |
| JP5704488B2 (en) * | 2011-04-14 | 2015-04-22 | 日本ヒューム株式会社 | Propulsion pipe connection structure |
| CN105697027A (en) * | 2015-12-08 | 2016-06-22 | 中国铁建大桥工程局集团有限公司 | Multi-balance comprehensive tube push bench for water-rich sand and gravel stratum |
| CN206468897U (en) * | 2017-01-23 | 2017-09-05 | 徐州徐工基础工程机械有限公司 | A kind of deviation correcting device of push-bench |
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