Method for enabling long-distance pipeline inclined shaft to penetrate through non-self-weight collapsible loess gully

Abstract

The invention belongs to the technical field of loess area pipeline laying, and particularly relates to a method for a long-distance pipeline inclined shaft to penetrate through a non-self-weight collapsible loess gully. Comprising the following steps that S1, an inclined shaft hole is constructed in a non-self-weight collapsible loess gully section; s2, inclined shaft pipeline prefabrication is conducted on the operation platform at the top of the inclined shaft hole; s3, the prefabricated inclined shaft pipeline is put into the inclined shaft hole from the upper opening; s4, after the inclined shaft pipeline is installed in place, the top end of the inclined shaft pipeline communicates with the elbow between the ground pipelines at the slope top, and then the bottom end of the inclined shaft pipeline communicates with the elbow between the ground pipelines at the slope bottom; s5, after the inclined shaft pipeline is laid, an inclined shaft hole, an upper opening and a slope bottom operation pit are backfilled; compared with traditional excavation construction, inclined shaft crossing has the advantage of being high in construction efficiency, construction can be completed more quickly, the construction time is shortened, the working efficiency is improved, the cost of foundation burying, ground restoration and the like is reduced, and the overall engineering cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline laying in loess areas, and in particular relates to a method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully. Background Art

[0002] Non-self-weight collapsible loess refers to loess that does not collapse under saturated self-weight pressure after being soaked in water, and only collapses after being soaked in water with a certain pressure. Due to the special soil properties of loess, it is easy to form hills and gullies, and the detour distance is long when the pipeline is laid in the gully. As a traditional construction method, the large excavation construction technology has great limitations when used for construction in loess gully areas. Because the loess gullies are steep and deep, with large slopes, the large excavation construction requires large slopes and huge earthwork. After the excavation and pipeline laying are completed, hydraulic protection measures such as water cutoff walls, drainage ditches or mortar-laid stone slope protection need to be set up along the slope. At the same time, due to the large amount of slopes and wide operating bandwidth, some surrounding farmlands will be damaged, requiring permanent land acquisition, which increases the difficulty of coordinating the relationship between workers and farmers and the cost of land acquisition. Large excavation crossing construction is usually suitable for gully crossing in areas with a height difference of about 10m, a small slope, and sparsely populated areas. Summary of the invention

[0003] The invention aims to solve the problems of low construction efficiency and poor safety when large loess gullies are encountered during pipeline laying and the terrain of the loess gullies is complex, and the large excavation construction process is used.

[0004] The present invention provides the following technical solution: a method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully, comprising the following steps:

[0005] S1: The inclined shaft hole is constructed in the non-self-weight collapsible loess gully section; the horizontal distance from the edge of the upper opening of the inclined shaft hole to the slope shoulder is not less than 15m; the horizontal distance from the edge of the slope bottom operation pit of the inclined shaft hole to the slope foot is not less than 3m; in the gully crossing section without scour data, the thickness of the covering soil on the top of the inclined shaft hole at the slope foot is not less than 2.5m;

[0006] S2: Prefabricate the inclined shaft pipeline on the working platform at the top of the inclined shaft hole;

[0007] S3: The prefabricated inclined well pipeline is lowered into the inclined well hole from the upper opening; before the inclined well pipeline is lowered into the inclined well hole, a single pipe is used to conduct a test pipe dragging;

[0008] S4: After the inclined well pipeline is installed in place, first connect the top end of the inclined well pipeline with the elbow between the ground pipeline at the top of the slope, and then connect the bottom end of the inclined well pipeline with the elbow between the ground pipeline at the bottom of the slope;

[0009] S5: After the inclined shaft pipeline is laid, backfill the inclined shaft holes, upper openings and operating pits at the bottom of the slope.

[0010] Furthermore, in step S1: the construction range of the inclined shaft hole is 8m≤H<80m, H is the vertical height from the top of the slope to the bottom of the slope where the gully is formed; the angle between the inclined shaft hole and the horizontal ground at the bottom of the slope is between 10° and 30°, and the aperture of the inclined shaft hole is 1.5 times the outer diameter of the inclined shaft pipe.

[0011] Furthermore, in step S2: the inclined shaft pipeline is prefabricated in sections in a two-to-one or three-to-one manner.

[0012] Furthermore, in step S3: when the inclined well pipe is lowered into the inclined well hole, an elliptical head with a traction nose is arranged at the front end of the inclined well pipe, and the connection between the elliptical head and the pipe end is protected by a polyethylene heat shrink sleeve.

[0013] Furthermore, in step S2: a patching band is added to the front end of the patching band on the inclined well pipeline and overlapped with the patching band of the original pipe mouth to protect the pipe mouth patching band; the welds of the inclined well pipeline are subjected to 100% radiographic inspection and 100% ultrasonic inspection.

[0014] Further, in step S5: the backfilling method of the inclined well hole is that when the inclined well pipe is lowered into the inclined well hole, one end of the guide rope is fixed to the front end of the inclined well pipe, and the guide rope passes through the inclined well hole with the inclined well pipe; when backfilling the inclined well hole, an upward pulling device is arranged at the upper opening, and a downward pulling device is arranged at the operating pit at the bottom of the slope, the lower end of the guide rope is connected to the flexible rope, and then the guide rope is pulled out at the upper opening to make the flexible rope pass into the inclined well hole; the two ends of the flexible rope are respectively connected to the upward pulling device and the downward pulling device, the flexible rope includes a fin rope segment in the middle and bare rope segments at both ends, and fin groups are spaced apart on the fin rope segment, and each fin group includes two For the fins, the upper ends of the fins are connected to the flexible ropes, and the lower ends of the fins can be opened and closed; when the backfill material is put into the inclined well hole through the upper opening, the upward pulling device and the downward pulling device operate alternately according to the set step distance, and the flexible rope moves back and forth up and down in the inclined well hole. When the flexible rope goes up, the fins are closed, and when the flexible rope goes down, the fins are opened to push the backfill material downward; in the initial stage of backfilling the inclined well hole, the fin rope segment is located at the bottom of the inclined well hole, and as the backfilling depth of the inclined well hole increases, the fin rope segment climbs upward; until the inclined well hole is filled, the fin rope segment of the flexible rope is pulled out of the inclined well hole, and the bare rope segment of the flexible rope is retained in the inclined well hole, thereby completing the backfilling of the inclined well hole.

[0015] Furthermore, in step S5: the upper opening and the operation pit at the bottom of the slope are backfilled and compacted with 28 cement soil, and the compaction coefficient is not less than 0.9.

[0016] Furthermore, a pin is inserted into the fin rope section of the flexible rope, and the upper end of the fin is hinged to the pin.

[0017] Furthermore, when the inclined shaft hole is backfilled, a baffle is installed in the operating pit at the bottom of the slope to close the hole of the inclined shaft hole, and the flexible rope passes through the reserved hole of the baffle.

[0018] Furthermore, steps S1 and S2 are performed synchronously.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] The method provided by the present invention is a method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully, which reduces the excavation, transportation and stacking of a large amount of engineering soil, is beneficial to environmental protection, can reduce damage to the natural environment, and protect the ecological environment; compared with traditional excavation construction, the inclined shaft crossing has the characteristics of high construction efficiency, can complete the construction more quickly, reduce construction time, improve work efficiency, reduce the costs of foundation burial, ground restoration, etc., and reduce the overall project cost.

[0021] The invention provides a method for backfilling inclined well holes, which solves the problem that the slope of the inclined well hole is relatively gentle, the backfill material accumulates at the upper part of the inclined well hole and cannot flow to the bottom of the hole by dragging a flexible rope with fins downward. The method can also improve the backfill density of the inclined well hole and prevent cracks and collapses from occurring in the section where the long-distance pipeline inclined well passes through. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the construction of a long-distance pipeline inclined shaft crossing a non-self-weight collapsible loess gully;

[0023] Figure 2 This is a schematic diagram of backfilling of inclined well holes;

[0024] Figure 3 Schematic diagram of a flexible rope.

[0025] In the figure: 1- inclined shaft hole; 2- upper opening; 3- operation pit at the bottom of the slope; 4- inclined shaft pipeline; 5- ground pipeline at the top of the slope; 6- ground pipeline at the bottom of the slope; 7- baffle; 8- upward pulling device; 9- downward pulling device; 10- flexible rope; 11- fin; 12- pin shaft; H- vertical height from the top of the slope to the bottom of the slope; h- soil cover thickness; L1- horizontal distance from the edge of the operation pit at the bottom of the slope to the foot of the slope; L 2- The horizontal distance from the edge of the upper opening to the slope shoulder; b1-the length of the operating pit at the bottom of the slope; b2-the length of the upper opening; a-the angle between the inclined shaft hole and the horizontal ground at the bottom of the slope. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] like Figure 1 As shown: A method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully, comprising the following steps:

[0028] S1: The inclined shaft hole 1 is constructed in the non-self-weight collapsible loess gully section; the horizontal distance from the edge of the upper opening 2 of the inclined shaft hole 1 to the slope shoulder is not less than 15m; the horizontal distance from the edge of the slope bottom operation pit 3 of the inclined shaft hole 1 to the slope foot is not less than 3m; in the gully crossing section without scouring data, at the slope foot, the thickness of the covering soil on the top of the inclined shaft hole 1 is not less than 2.5m;

[0029] The construction range of the inclined shaft hole 1 is 8m≤H<80m, where H is the vertical height from the top of the slope to the bottom of the slope where the gully is formed; the angle between the inclined shaft hole 1 and the horizontal ground at the bottom of the slope is between 10° and 30°, and the aperture of the inclined shaft hole 1 is 1.5 times the outer diameter of the inclined shaft pipe 4.

[0030] S2: Prefabricate the inclined shaft pipeline 4 on the working platform at the top of the inclined shaft hole 1; steps S1 and S2 can be performed simultaneously.

[0031] S3: The prefabricated inclined shaft pipeline 4 is lowered into the inclined shaft hole 1 from the upper opening 2; before the inclined shaft pipeline 4 is lowered into the inclined shaft hole 1, a single pipe is used to test the pipe, and necessary protective measures are taken for the inclined shaft pipeline 4 according to the damage of the anti-corrosion layer of the test pipe.

[0032] When the inclined well pipe 4 is lowered into the inclined well hole 1, an elliptical head with a traction nose is arranged at the front end of the inclined well pipe 4, and a polyethylene heat shrink sleeve is used to protect the connection between the elliptical head and the pipe end to prevent soil from entering the inclined well pipe 4.

[0033] S4: After the inclined shaft pipe 4 is installed in place, first connect the top end of the inclined shaft pipe 4 with the elbow between the ground pipe 5 at the top of the slope, pad the inclined shaft pipe 4 with a flexible object, remove auxiliary facilities such as the gantry, fall chain, nylon belt, and then connect the bottom end of the inclined shaft pipe 4 with the elbow between the ground pipe 6 at the bottom of the slope; considering the operability of the construction, the width of the upper opening 2 ≥ the length of the elbow + 30cm, and the width of the operating pit 3 at the bottom of the slope ≥ the length of the elbow + 30cm.

[0034] S5: After the inclined shaft pipeline 4 is laid, the inclined shaft hole 1, the upper opening 2 and the operating pit 3 at the bottom of the slope are backfilled.

[0035] A mud sedimentation tank is set up near the operation pit 3 at the bottom of the slope to temporarily store and settle the mud to prevent the mud from flowing freely and causing environmental pollution. Since the geological conditions of the construction site are non-self-weight wet loess, sealed containers or water pipes should be used when using water to avoid water leakage causing collapse of the construction site or even instability of the slope.

[0036] In step S2: when the crossing distance is long, the inclined shaft pipeline 4 is prefabricated in sections in a two-to-one or three-to-one manner.

[0037] In step S2: the inclined well pipeline 4 must be subjected to electric spark leak detection and patching. In order to prevent the patching tape of the inclined well pipeline 4 from being scratched or curled during the process of sliding into position, a patching tape is added to the front end of the patching tape on the inclined well pipeline 4, and overlapped with the patching tape of the original pipe mouth to protect the patching tape of the pipe mouth; the welds of the inclined well pipeline 4 are subjected to 100% radiographic flaw detection and 100% ultrasonic flaw detection. After the gully crossing pipe section is installed in place, a strength pressure test and a tightness pressure test are carried out separately according to the requirements of large and medium-sized crossings.

[0038] like Figure 2 , Figure 3 As shown, in step S5: the backfilling method of the inclined well hole 1 is that when the inclined well pipe 4 is lowered into the inclined well hole 1, one end of the guide rope is fixed to the front end of the inclined well pipe 4, and the guide rope passes through the inclined well hole 1 along with the inclined well pipe 4; when backfilling the inclined well hole 1, an upward pulling device 8 is arranged at the upper opening 2, and a downward pulling device 9 is arranged at the operating pit 3 at the bottom of the slope. The upward pulling device 8 and the downward pulling device 9 use a winch. According to the on-site conditions, a hanger can be made to hang the upward pulling device 8 and the downward pulling device 9 in the pit, the lower end of the guide rope is connected to the flexible rope 10, and then the guide rope is pulled out at the upper opening 2 to allow the flexible rope 10 to pass into the inclined well hole 1; the two ends of the flexible rope 10 are respectively connected to the upward pulling device 8 and the downward pulling device 9, and the flexible rope 1 0 includes a fin rope section in the middle and bare rope sections at both ends, fin groups are arranged at intervals on the fin rope section, each fin group includes two opposite fins 11, the upper end of the fin 11 is connected to the flexible rope 10, and the lower end of the fin 11 can be opened and closed; when the backfill material is put into the inclined well hole 1 through the upper opening 2, the upward pulling device 8 and the downward pulling device 9 are operated alternately by retracting and releasing according to the set step distance, and the flexible rope 10 reciprocates up and down in the inclined well hole 1, the fin 11 is closed when the flexible rope 10 goes up, and the fin 11 is opened and pushed downward to push the backfill material when the flexible rope 10 goes down; when the upward pulling device 8 and the downward pulling device 9 are operated alternately, the flexible rope 10 is first released, and then the flexible rope 10 is reeled in, so that the flexible rope 10 is always under force at one end to prevent the taut flexible rope 10 from cutting the soil.

[0039] At the initial stage of backfilling the inclined well hole 1, the fin rope segment is located at the bottom of the inclined well hole 1, and the backfill material thrown in from the upper opening 2 is continuously pushed toward the bottom by the fins 11 on the flexible rope 10. As the backfilling depth of the inclined well hole 1 increases, the fin rope segment climbs upward, and the fins 11 at the bottom can compact the backfilled part; until the inclined well hole 1 is filled, the fin rope segment of the flexible rope 10 is pulled out of the inclined well hole 1, and the bare rope segment of the flexible rope 10 is retained in the inclined well hole 1, thereby completing the backfilling of the inclined well hole 1.

[0040] The flexible rope 10 is made of nylon rope, and a pin 12 is inserted into the fin rope section of the flexible rope 10. The fin 11 is made of metal, and has a V-shaped or arc-shaped cross section. The upper end of the fin 11 is hinged with the pin 12. When the flexible rope 10 is pulled upward, the two fins 11 are brought together, and when the flexible rope 10 is pulled downward, the two fins 11 are spread apart, and the spread fins 11 push the backfill material downward. The backfill material is a sand-soil mixture, and sand is mixed into the soil to increase fluidity.

[0041] When the inclined well hole 1 is backfilled, a baffle 7 is installed in the operating pit 3 at the bottom of the slope to close the hole of the inclined well hole 1 to prevent the backfill material from leaking out. The flexible rope 10 passes through the reserved hole of the baffle 7. The baffle 7 is made of thick wooden boards, the through holes of the baffle 7 are rounded, and lubricating oil is applied regularly to prevent the flexible rope 10 from breaking due to friction.

[0042] In step S5: In order to effectively prevent water from entering the hole of the inclined shaft hole 1, the upper opening 2 and the operation pit 3 at the bottom of the slope are backfilled and compacted with 28 cement soil, and the compaction coefficient is not less than 0.9. For gullies with large water collection and possible scouring, the burial depth should be increased according to the specific situation, and corresponding hydraulic protection measures should be combined. If the surface is cultivated land or vegetation, 50-60cm thick cultivated soil must be reserved on the surface.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully, characterized in that: The following steps are involved: S1: The inclined shaft hole (1) is constructed in the non-self-weight collapsible loess gully section; the horizontal distance from the edge of the upper opening (2) of the inclined shaft hole (1) to the slope shoulder is not less than 15m; the horizontal distance from the edge of the slope bottom operation pit (3) of the inclined shaft hole (1) to the slope foot is not less than 3m; in the gully crossing section without scouring data, at the slope foot, the thickness of the covering soil on the top of the inclined shaft hole (1) is not less than 2.5m; S2: Prefabricate the inclined shaft pipeline (4) on the working platform at the top of the inclined shaft hole (1); S3: The prefabricated inclined well pipe (4) is lowered into the inclined well hole (1) from the upper opening (2); before the inclined well pipe (4) is lowered into the inclined well hole (1), a single pipe is used to conduct a test pipe dragging; S4: After the inclined well pipe (4) is installed in place, the top end of the inclined well pipe (4) is first connected to the elbow between the ground pipe (5) at the top of the slope, and then the bottom end of the inclined well pipe (4) is connected to the elbow between the ground pipe (6) at the bottom of the slope; S5: After the inclined well pipeline (4) is laid, the inclined well hole (1), the upper opening (2) and the operation pit (3) at the bottom of the slope are backfilled.

2. The method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully according to claim 1, characterized in that: In step S1: the construction range of the inclined well hole (1) is 8m≤H<80m, H is the vertical height from the top of the slope to the bottom of the slope where the gully is formed; the angle between the inclined well hole (1) and the horizontal ground at the bottom of the slope is between 10° and 30°, and the aperture of the inclined well hole (1) is 1.5 times the outer diameter of the inclined well pipe (4).

3. The method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully according to claim 2, characterized in that: In step S2: the inclined shaft pipeline (4) is prefabricated in sections in a two-to-one or three-to-one manner.

4. The method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully according to claim 2, characterized in that: In step S3: when the inclined well pipe (4) is lowered into the inclined well hole (1), an elliptical head with a traction nose is arranged at the front end of the inclined well pipe (4), and the connection between the elliptical head and the pipe end is protected by a polyethylene heat shrink sleeve.

5. The method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully according to claim 4, characterized in that: In step S2: a patching band is added to the front end of the patching band on the inclined well pipeline (4), overlapped with the patching band of the original pipe mouth, and the pipe mouth patching band is protected; the weld of the inclined well pipeline (4) is 100% radiographically inspected and 100% ultrasonically inspected.

6. The method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully according to claim 5, characterized in that: In step S5: the backfilling method of the inclined well hole (1) is that when the inclined well pipe (4) is lowered into the inclined well hole (1), one end of the guide rope is fixed to the front end of the inclined well pipe (4), and the guide rope passes through the inclined well hole (1) along with the inclined well pipe (4); when backfilling the inclined well hole (1), an upward pulling device (8) is arranged at the upper opening (2), and a downward pulling device (9) is arranged at the operation pit (3) at the bottom of the slope, and the lower end of the guide rope is connected to the flexible rope (10), and then the guide rope is pulled out at the upper opening (2) to make the flexible rope (10) pass into the inclined well hole (1); the two ends of the flexible rope (10) are respectively connected to the upward pulling device (8) and the downward pulling device (9), and the flexible rope (10) includes a fin rope section in the middle and bare rope sections at both ends, and fin groups are spaced apart on the fin rope section, and each fin group includes two opposite fins (11), and the fins (12) are connected to the fins (13) at the bottom of the slope. The upper end of the fin (11) is connected to the flexible rope (10), and the lower end of the fin (11) can be opened and closed; when backfill is put into the inclined well hole (1) through the upper opening (2), the upward pulling device (8) and the downward pulling device (9) are operated alternately by retracting and releasing according to the set step distance, and the flexible rope (10) moves back and forth up and down in the inclined well hole (1). When the flexible rope (10) moves upward, the fin (11) is closed, and when the flexible rope (10) moves downward, the fin (11) is closed. The sheet (11) opens and pushes the backfill material downward; at the initial stage of backfilling the inclined well hole (1), the fin rope segment is located at the bottom of the inclined well hole (1), and as the backfilling depth of the inclined well hole (1) increases, the fin rope segment climbs upward; until the inclined well hole (1) is filled, the fin rope segment of the flexible rope (10) is pulled out of the inclined well hole (1), and the bare rope segment of the flexible rope (10) is retained in the inclined well hole (1), completing the backfilling of the inclined well hole (1).

7. The method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully according to claim 5, characterized in that: In step S5: the upper opening (2) and the operation pit (3) at the bottom of the slope are backfilled and compacted with 28% cement soil, and the compaction coefficient is not less than 0.

9.

8. The method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully according to claim 6, characterized in that: A pin shaft (12) is inserted into the fin rope section of the flexible rope (10), and the upper end of the fin (11) is hinged to the pin shaft (12).

9. The method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully according to claim 7, characterized in that: When the inclined shaft hole (1) is backfilled, a baffle (7) is installed in the operation pit (3) at the bottom of the slope to close the hole of the inclined shaft hole (1), and the flexible rope (10) passes through the reserved hole of the baffle (7).

10. The method for a long-distance pipeline inclined shaft to cross a non-self-weight collapsible loess gully according to claim 1, characterized in that: Steps S1 and S2 are performed synchronously.

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