Pipe jacking construction method and equipment for sandy soil layer

Abstract

The application discloses a sand and sandy stratum pipe jacking construction method and equipment, which comprises a reference element and a test element, wherein the reference element and the test element both comprise a mounting ring and an assembly ring, the assembly ring is arranged at the middle part of the corresponding mounting ring, a plurality of interval distributed threaded barrels are fixedly arranged between the outer ring surface of the assembly ring and the corresponding mounting ring, the threaded barrels are in an open state at the end part extending to the outside of the assembly ring and are provided with adjusting screws, and the adjusting screws are fixedly provided with contact discs at one end outside the threaded barrels. In the application process, whether the pipeline is deviated from the overall axis of the pipeline and the deviation direction can be determined, and timely correction in the construction process is facilitated.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking construction prevention and control technology, and in particular to pipe jacking construction methods and equipment in sandy and sandy strata. Background Technology

[0002] Pipe jacking is a trenchless construction method, a technology for laying pipelines with little or no excavation. In pipe jacking, the jacking equipment in the working pit generates jacking force to overcome the friction between the pipeline and the surrounding soil, pushing the pipeline into the ground at the designed slope, and then removing the excavated soil.

[0003] Pipe jacking construction often occurs in environments where surface excavation is not possible. In the case of sandy soil, the following issues need to be addressed: how to determine if the pipe has deviated and in what direction; how to prevent soil settlement on both sides above the pipe; and how to address the increased resistance of pipe jacking and water seepage between pipes. Summary of the Invention

[0004] The purpose of this invention is to solve the prevention and control problems in pipe jacking construction in sandy strata, and to propose a method and equipment for pipe jacking construction in sandy strata.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The construction method for pipe jacking in sandy soil strata includes the following steps:

[0007] S1: For sandy soil layers, conduct a survey of the sandy soil along the pipeline path before pipe jacking construction, and draw a soil pressure diagram in meters based on the survey results.

[0008] S2: For the pipe jacking method adopted, ensure that the specifications of the corresponding hydraulic jacks are consistent;

[0009] S3: For hydraulic jacks, a corresponding force measuring device is set up to control the working state of the hydraulic jacks based on the position of the jacking pipe relative to the pressure diagram, so as to ensure that the jacking force of the jacking pipe is balanced with the soil pressure at the front end.

[0010] S4: During the pipe jacking process, lubricating and supporting medium is injected into the gap between the pipe and the soil.

[0011] S5: For water seepage that still exists between pipes after the lubrication and support medium has been used during the jacking process, use sealing tape to seal it.

[0012] S6: For each section of pipe during the jacking process, use prevention and control equipment to test the overall pipe offset.

[0013] S7: Based on the tested offset data, promptly correct the deviation of the jacking pipe to ensure that the overall axis of the pipeline is controlled within the allowable deviation range.

[0014] S8: After the jacking process is completed, remove the adhesive tape used for sealing and inject a sealant into the pipes to seal them.

[0015] Preferably, in step S2, using hydraulic jacks of the same specifications can ensure that the jacking force, stroke, and speed of the hydraulic jacks are consistent during the jacking process of the jacking pipe.

[0016] Preferably, for step S4, it should be ensured that the amount of lubricating support medium injected is sufficient to completely fill the gap, and timely injection should be ensured.

[0017] Preferably, in step S4, after the pipe jacking construction is completed, the injected lubricating support medium is promptly replaced with filler.

[0018] Preferably, the filler is cement or fly ash.

[0019] Equipment for pipe jacking construction in sandy strata includes a reference component and a test component. Both the reference component and the test component include a mounting ring and an assembly ring. The assembly ring is located in the middle of the corresponding mounting ring. Several threaded cylinders are fixedly installed between the outer ring surface of the assembly ring and the corresponding mounting ring. The end of the threaded cylinder extending to the outside of the assembly ring is open and equipped with an adjusting screw. A contact plate is fixedly installed at the end of the adjusting screw located outside the threaded cylinder.

[0020] A projection disk is installed on the assembly ring corresponding to the reference component. A rangefinder and a laser pointer are respectively installed on both sides of the middle part of the projection surface of the projection disk, and the rangefinder and laser pointer are close to each other.

[0021] A reflective disc is mounted on the assembly ring corresponding to the test piece, and the reflective disc has a reflective surface corresponding to the projection disc.

[0022] Preferably, a mounting cylinder with an open front end is welded to one side of the outer surface of the open end of the threaded cylinder, and a telescopic spring is fixedly connected to the inner bottom of the mounting cylinder. The other end of the telescopic spring is connected to a scale bar, and the other end of the scale bar is in contact with the lower surface of the contact plate.

[0023] The beneficial effects of the pipe jacking construction method and equipment proposed in this invention are as follows: In the application of this technical solution, by surveying the sandy soil along the pipeline path and combining it with the drawn soil pressure diagram, the jacking force of the pipe and the soil pressure at the front end can be kept in balance, thereby effectively avoiding the phenomenon of overall pipeline axis deviation caused by the imbalance between the jacking force of the pipe and the soil pressure at the front end.

[0024] During the pipe jacking process, the relative angle between the pipe corresponding to the test piece and the pipe corresponding to the reference piece can be determined by the distance data between the reference piece and the test piece, the distance data between the refracted projection point and the laser pointer, and the data between the refracted projection point and the laser pointer relative to the horizontal plane where the laser pointer is located. This allows us to determine whether the pipe has deviated from the overall axis of the pipe and the direction of the deviation, which is beneficial for timely correction during construction.

[0025] By injecting lubricating support medium, it can be ensured that there is no gap between the advancing pipeline and the soil above. In this case, it can prevent the settlement of the sandy soil above and also play a certain lubricating role, preventing the advance of the pipe from becoming too large. After the laying is completed, the lubricating support medium can be replaced by filling material to ensure that the soil between the pipeline and the soil is in a stable and reliable state, avoiding the settlement of the soil on both sides above the pipeline due to the passage of time.

[0026] By using sealing tape and leak-stopping agent, water can be prevented from entering the pipes through the gaps between the pipes, thus preventing soil settlement at the seepage points caused by water seepage. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the reference component of the equipment for pipe jacking construction in sandy strata proposed in this invention;

[0028] Figure 2 This is a schematic diagram of the test specimen of the equipment for pipe jacking construction in sandy soil strata proposed in this invention;

[0029] Figure 3 This is a schematic diagram of the test state between the reference piece and the test piece proposed in this invention;

[0030] Figure 4 The present invention proposes Figure 3 Enlarged diagram of point A.

[0031] In the diagram: 1. Reference piece; 2. Test piece; 3. Mounting ring; 4. Assembly ring; 5. Threaded cylinder; 6. Adjusting screw; 7. Contact plate; 8. Mounting cylinder; 9. Telescopic spring; 10. Scale bar; 11. Reflecting disc; 12. Projection disc; 13. Rangefinder; 14. Laser pointer. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Example 1

[0035] Reference Figure 1-4 The construction method for pipe jacking in sandy soil strata includes the following steps:

[0036] S1: For sandy soil layers, conduct a survey of the sandy soil along the pipeline path before pipe jacking construction, and draw a soil pressure diagram in meters based on the survey results.

[0037] S2: For the pipe jacking method adopted, ensure that the specifications of the corresponding hydraulic jacks are consistent;

[0038] S3: For hydraulic jacks, a corresponding force measuring device is set up to control the working state of the hydraulic jacks based on the position of the jacking pipe relative to the pressure diagram, so as to ensure that the jacking force of the jacking pipe is balanced with the soil pressure at the front end.

[0039] S4: During the pipe jacking process, lubricating and supporting medium is injected into the gap between the pipe and the soil.

[0040] S5: For water seepage that still exists between pipes after the lubrication and support medium has been used during the jacking process, use sealing tape to seal it.

[0041] S6: For each section of pipe during the jacking process, use prevention and control equipment to test the overall pipe offset.

[0042] S7: Based on the tested offset data, promptly correct the deviation of the jacking pipe to ensure that the overall axis of the pipeline is controlled within the allowable deviation range.

[0043] S8: After the jacking process is completed, remove the adhesive tape used for sealing and inject a sealant into the pipes to seal them.

[0044] Hydraulic jacks of the same specifications can ensure that the jacking force, stroke and speed are consistent during the jacking process. Furthermore, it should be ensured that the amount of lubricating support medium injected can completely fill the gaps, and timely injection is required.

[0045] After the pipe jacking construction is completed, the injected lubricating support medium should be replaced in a timely manner with filler material, such as cement or fly ash.

[0046] Through the above prevention and control measures, by surveying the sandy soil along the pipeline path and drawing a soil pressure diagram, it is possible to maintain a balance between the jacking force of the pipe jacking and the soil pressure at the front end, thereby effectively avoiding the overall axial displacement of the pipeline caused by the imbalance between the jacking force of the pipe jacking and the soil pressure at the front end.

[0047] By injecting lubricating support medium, it can be ensured that there is no gap between the advancing pipeline and the soil above. In this case, it can prevent the settlement of the sandy soil above and also play a certain lubricating role, preventing the advance of the pipe from becoming too large. After the laying is completed, the lubricating support medium can be replaced by filling material to ensure that the soil between the pipeline and the soil is in a stable and reliable state, avoiding the settlement of the soil on both sides above the pipeline due to the passage of time.

[0048] By using sealing tape and leak-stopping agent, water can be prevented from entering the pipes through the gaps between the pipes, thus preventing soil settlement at the seepage points caused by water seepage.

[0049] Example 2

[0050] Reference Figure 1-4 Based on the above embodiments, the equipment for pipe jacking construction in sandy strata includes a reference component 1 and a test component 2. Both the reference component 1 and the test component 2 include an installation ring 3 and an assembly ring 4. The assembly ring 4 is located in the middle of the corresponding installation ring 3. A plurality of threaded cylinders 5 are fixedly installed between the outer ring surface of the assembly ring 4 and the corresponding installation ring 3. The end of the threaded cylinder 5 extending to the outside of the assembly ring 4 is open and is equipped with an adjusting screw 6. A contact plate 7 is fixedly installed at one end of the adjusting screw 6 located outside the threaded cylinder 5.

[0051] A projection disk 12 is installed on the assembly ring 4 corresponding to the reference component 1. A rangefinder 13 and a laser pointer 14 are respectively installed on both sides of the middle part of the projection surface of the projection disk 12. The rangefinder 13 and the laser pointer 14 are close to each other.

[0052] The test piece 2 is mounted on the assembly ring 4, which is equipped with a reflective disc 11. The reflective disc 11 has a reflective surface corresponding to the projection disc 12.

[0053] A mounting cylinder 8 with an open front end is welded to one side of the outer surface of the open end of the threaded cylinder 5. A telescopic spring 9 is fixedly connected to the inner bottom of the mounting cylinder 8. A scale bar 10 is connected to the other end of the telescopic spring 9. The other end of the scale bar 10 is in contact with the lower surface of the contact plate 7.

[0054] During the pipe jacking process, the relative angle between the pipe corresponding to the test piece 2 and the pipe corresponding to the reference piece 1 can be determined by the distance data between the reference piece 1 and the test piece 2, the distance data between the refracted projection point and the laser pointer 14, and the data between the refracted projection point and the laser pointer 14 relative to the horizontal plane where the laser pointer 14 is located.

[0055] Specifically, by adjusting the extension length of the adjusting screws 6 on the reference piece 1 and the test piece 2, and ensuring that the extensions are consistent as determined by the scale bar 10, it is ensured that the reflecting disc 11 and the projection disc 12 are both centered in their respective pipes.

[0056] The laser pointer 14 on the reference piece 1 emits light onto the reflective disc 11 of the test piece 2, and at the same time the rangefinder 13 can measure the distance between the laser pointer 14 and the reflective disc 11, denoted as H1;

[0057] The light rays projected onto the reflector 11 will be reflected back onto the projection disk 12. At this time, the distance between the projection point on the projection disk 12 and the laser pointer 14, as well as the angle between the line connecting the projection point and the laser pointer 14 and the horizontal plane where the laser pointer 14 is located, are measured. The distance is recorded as H2.

[0058] Since the light emitted by the laser pointer 14 is perpendicular to the projection disk 12, the angle Z1 in the figure can be known. Then, the angles Z2 and Z3 can be calculated in sequence, and finally the angle Z4 can be obtained. Angle Z4 is the relative angle between the pipe corresponding to the test piece 2 and the pipe corresponding to the reference piece 1. Therefore, this angle data can be used to determine whether the pipe has shifted relative to the overall axis of the pipe. Furthermore, based on the angle between the connecting line between the projection point and the laser pointer 14 and the horizontal plane where the laser pointer 14 is located, the offset direction of the pipe corresponding to the test piece 2 relative to the pipe corresponding to the reference piece 1 can be determined, which is conducive to timely correction during construction.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pipe jacking method in sandy soil, characterized by, It comprises the following steps: S1: for sandy soil, before pipe jacking construction, the pipeline through the path of sandy soil survey, for the survey results, in units of meters to draw soil pressure diagram; S2: for the pipe jacking, ensure that the corresponding hydraulic jack specifications are consistent; S3: for the hydraulic jack, set up the corresponding force measuring device, based on the position of the pipe jacking relative to the pressure diagram, control the working state of the hydraulic jack, to ensure that the pipe jacking force and the front end of the soil pressure balance; S4: in the process of pipe jacking, for the gap between the pipe and the soil, the gap is injected into the lubricating support medium; S5: for the pipe jacking process, after the completion of the lubricating support medium, the water seepage phenomenon still exists between the pipe, use sealing tape to paste and block; S6: for each pipe in the process of pipe jacking, use the prevention and control equipment to test the overall pipe deviation; S7: for the test of the deviation data, timely corresponding amplitude of the pipe jacking, to ensure that the overall axis of the pipe is controlled within the allowable deviation range; S8: after the end of the pipe jacking process, the sealing tape is torn off, and the leak stopper is injected between the pipes to block. The device for sand and sandy stratum pipe jacking construction comprises a reference part (1) and a test part (2). The reference part (1) and the test part (2) each comprise a mounting ring (3) and an assembly ring (4). The assembly ring (4) is arranged at the middle of the corresponding mounting ring (3). A plurality of interval distributed threaded cylinders (5) are fixedly arranged between the outer ring surface of the assembly ring (4) and the corresponding mounting ring (3). The threaded cylinder (5) extends to the open end outside the assembly ring (4) and is provided with an adjusting screw rod (6). The adjusting screw rod (6) is fixedly provided with a contact disc (7) at one end outside the threaded cylinder (5). An installation cylinder (8) with an open front end is welded on one side of the outer surface of the open end of the threaded cylinder (5). The inner bottom of the installation cylinder (8) is fixedly connected with a telescopic spring (9). The other end of the telescopic spring (9) is connected with a scale bar (10). The other end of the scale bar (10) is in contact with the lower surface of the contact disc (7). The corresponding assembly ring (4) of the reference part (1) is provided with a projection disc (12). The projection surface of the projection disc (12) is provided with a distance meter (13) and a laser pen (14) on both sides of the middle part. The distance meter (13) and the laser pen (14) are in close state. The corresponding assembly ring (4) of the test part (2) is provided with a reflecting disc (11). The reflecting disc (11) is provided with a reflecting surface corresponding to the projection disc (12).

2. The sand soil stratum pipe jacking construction method according to claim 1, characterized by, In step S2, the hydraulic jack with consistent specifications can ensure that the jacking force, stroke and speed between the hydraulic jacks are consistent during the pipe jacking process.

3. The sand soil stratum pipe jacking construction method according to claim 1, characterized by, For step S4, the injection amount of the lubricating support medium should be enough to fill the gap, and it needs to be injected in time.

4. The sand soil stratum pipe jacking construction method according to claim 1, characterized by, For step S4, after the pipe jacking construction is completed, the injected lubricating support medium is replaced in time by using a filler.

5. The sand soil stratum pipe jacking construction method according to claim 4, characterized by, The filler is cement or fly ash.

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