Trenchless pipe burial construction method with man-machine top-to-top

Abstract

The present invention discloses a human-machine trenchless pipe burial construction method, which includes extracting the location of the pipe jacking working well according to the requirements of the designed pipeline location, and determining the positions of the two working wells by staking out using an RTK measurement system or a total station. After determining the working position, according to the geological structure characteristics shown in the geological survey report, the pipe jacking working well can be made of Larsen steel sheet piles or reinforced concrete according to the geological conditions and design requirements. The mechanical excavation working well is 11.5m*8.5m, and the manual excavation working well is 9.5m*7.5m. The size of the working well is determined according to the equipment, pipeline diameter and working space, and the back wall adopts assembled reinforcement equipment. The beneficial effect of the present invention is that this method adopts a simultaneous construction method of manual excavation and mechanical excavation, which greatly shortens the construction period and effectively reduces the demolition and excavation area of existing public infrastructure.

Description

Technical Field

[0001] The invention relates to the field of excavation pipe burial construction, in particular to a human-machine top-to-top trenchless pipe burial construction method. Background Art

[0002] Trenchless pipe burial technology is currently widely used in urban drainage pipeline construction projects. Compared with traditional trenching techniques, it offers advantages such as improved cost-effectiveness and faster construction speed. Pipe jacking technology used in municipal engineering construction can reduce surface excavation, minimize damage to urban roads, and significantly reduce urban traffic congestion caused by construction. However, currently, both manual and mechanical pipe jacking (including slurry and earth pressure balance methods) suffer from low efficiency due to limitations in existing processes, equipment, and construction sites. Current construction efficiency is typically 4-8 meters per day. While there are numerous advanced single-direction jacking techniques being studied domestically and internationally, particularly in quicksand, rock, intersecting, and overlapping strata, there is currently limited room for further improvement in the efficiency of single-direction jacking, and research on simultaneous counter-direction jacking is extremely limited. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems and to design a man-machine top-to-top trenchless pipe burying construction method.

[0004] The technical solution of the present invention to achieve the above-mentioned purpose is a human-machine top non-excavation pipe burial construction method, which includes the following steps:

[0005] S1: According to the requirements of the designed pipeline position, the position of the jacking working well is extracted, and the positions of the two working wells are determined by RTK measurement system or total station.

[0006] S2: After determining the working location, based on the geological structure characteristics shown in the geological survey report, the jacking working well can be made of Larsen steel sheet piles or reinforced concrete according to the geological conditions and design requirements. The mechanical excavation working well is 11.5m*8.5m, and the manual excavation working well is 9.5m*7.5m. The working well size is determined by the equipment, pipeline diameter and working space. The back wall is reinforced with prefabricated equipment;

[0007] S3: Use the total station to determine points A1 and A2 of the mechanical operation working well and the manual operation working well respectively according to the coordinates on the drawing. Place the total station at point A1, look back at point A2, draw an extension line of the straight line A1A2, and determine point C1 at the rear of the mechanical operation working well and point C2 at the rear of the manual operation working well. Then, determine any points B1 and B2 at the bottom of the two wells, place the level at points B1 and B2 respectively, and determine the elevation of the pipeline centerline at the positions of points A1 and C1 and points A2 and C2 on the drawing. The straight line of the four points C1, A1, A2 and C2 is the jacking axis we are looking for.

[0008] S4: After the axis is determined, place the rear backrest first. The back of the rear backrest should be 100-200mm away from the well wall. Adjust the backrest in the front and back and left and right directions. Try to ensure that the center of the backrest coincides with the axis. After the axis is determined, you can install the guide rail and the rear top. First, calculate the height difference h from the top surface of the guide rail to the axis according to the size of the guide rail itself. Use a spirit level in the well and make 4-6 water points around the well to ensure that the axis elevation - water point elevation = h. When placing the guide rail, you can use a rope to draw a straight line at two opposite water points so that the top of the guide rail lightly touches the rope. Then adjust the guide rail axis in the vertical direction according to the axis to coincide with the vertical projection line of the known axis. After the guide rail axis direction is adjusted, fine-tune the guide rail elevation. Finally, support the guide rail to the well wall. Lead the axis to the front and back sides of the well bottom A , B. The working method of mechanical operation well is consistent with that of manual operation. Split the backrest in the middle and make a midpoint C on the backrest. When placing the backrest, try to make point C on the extension line of AB. This value can be identified by naked eye. The error should not be greater than 10cm. Set any two points D and D' at the edge of the backrest. Measure the distance between AD and AD'. Just make sure that the distance between AD is approximately equal to the distance between AD'. The error should not be greater than 3cm. After the left and right directions of the guide rail are determined, fix one point on each side below. Then use a plumb line to adjust the front and back directions. Finally, fill the gap between the well wall and the backrest with concrete of C15 to C30 according to the actual situation. The installation of the rear top is carried out after the installation of the rear backrest is completed. After leveling the rear top, the backrest can be fixed as long as the rear plane of the jack is firmly attached to it.

[0009] S5: Grouting reinforcement is performed on the sand layer within 1m around the pipe position. The grouting ratio is determined through experiments to prevent the upper sand layer from collapsing and being lost along with the mud when the tunnel is pushed out.

[0010] S6: Check through the water level observation hole whether the precipitation effect outside the tunnel entrance meets the requirements; the annular gap between the tunnel entrance water stop ring and the machine head shell is uniform, sealed, and no mud flows in; the sealing door can be removed only after there is no obvious subsidence on the ground outside the tunnel; before leaving the tunnel, conduct a comprehensive inspection of all equipment to check whether the hydraulic, electrical, grouting, air pressure, water pressure, lighting, communication, ventilation and other operating systems can work normally, and whether various electric meters, pressure gauges, reversing valves, sensors, flow meters, etc. can correctly indicate that they are in working state. Then conduct linkage debugging and confirm that there are no faults before preparing to leave the tunnel. If there are any problems, adjust, repair or replace them in time;

[0011] S7: The mechanical excavation working face and the manual excavation working face are jacking forward simultaneously. When the two working faces are 3 to 5 times the pipe diameter apart, the manual excavation stops and the mechanical work continues. When the two working faces are 1 to 2 times the pipe diameter apart, the mechanical work stops and the manual excavation continues until all pipes are penetrated. The manual excavation work stops and all personnel are withdrawn. The mechanical excavation equipment does not move and only continues the jacking work until all the manually excavated pipes and the mechanical excavator heads are withdrawn from the manual excavation working shaft. The withdrawn pipes are transferred to the mechanical jacking working shaft and the jacking continues to complete the jacking work.

[0012] S8: After the jacking is completed, grouting reinforcement is carried out around the pipe wall in a timely manner according to the grouting requirements to prevent settlement;

[0013] Furthermore, after the guide rails are installed in step S4, a secondary guide rail must be installed in the reserved hole. The axis and elevation of the secondary guide rail must be aligned with the primary guide rail. This secondary guide rail is used to prevent the machine head from lowering after entering the hole. The mud-water balanced pipe jacking equipment is used to prevent the mud bin from being blocked by suction.

[0014] Furthermore, in step S5, a bottom-up grouting method is used, and the construction steps are as follows:

[0015] After staking out and positioning, putting the drilling rig and grouting equipment in place, and drilling to the designed depth, pour sealing mud from the drill pipe, insert the one-way plastic valve tube to the designed elevation, wait for the sealing slurry to solidify, stir the cement slurry and insert the two-way sealed grouting core tube into the plastic, carry out grouting, lift 0.3m, and circulate the grouting and lifting until the slurry in the hole is filled to the hole mouth.

[0016] Furthermore, the grouting technical parameters in step S5 are: grouting hole spacing distribution: 2m; grouting pressure: 0.2-0.6MPa; grouting flow rate: 15-20L / min.

[0017] Furthermore, before starting the tunneling system, it is necessary to ensure that there is sufficient hydraulic oil in the hydraulic pump group; each joint of the hydraulic oil hose and mud pipeline is reliable and the interface is correct; all control switches on the console are in neutral or stop position; all cables and electrical wiring are securely connected; the power supply meets the specified value; and the rotation direction of the motor is correct.

[0018] Furthermore, in step S6: after exiting the hole, measurement should be conducted at least once for every 30cm of jacking; during normal jacking, measurement should be conducted at least once for every 0.5m of jacking; additional measurement should be conducted 30m before entering the receiving working well, and measurement should be conducted at least once for every 30cm of jacking; after each jacking process, the horizontal axis and elevation of the entire line must be remeasured, a pipeline jacking trajectory diagram must be drawn, and the diagram must be inspected and reviewed by the construction quality supervisor;

[0019] The machine head itself has a direction-guiding device, which makes the deviation correction operation simple. The operator only needs to ensure that the laser point is always in the center of the rake through the deviation correction action. There should be a strict layout review system and original records should be kept. The jacking correction can be carried out by adjusting the deviation correction jack. If the pipeline deviates to the left, the jack adopts the left extension and right retraction method; vice versa. If there are elevation and direction deviations at the same time, the side with the larger deviation should be corrected first. In the event of a large deviation, the development trend should be analyzed, and gradual corrections should be made in batches, with frequent adjustments and micro-corrections. In the manual excavation section, by adding a circular jacking iron to the front end of the first section of the pipe, the thrust of the rear-end pump station is used to squeeze the soil into the first section of the pipe. The construction workers excavate the soil in the first and second sections of the pipe, which also avoids the internal workers' over-excavation of the front end of the pipe, and has achieved good results in terms of jacking speed and deviation correction.

[0020] Furthermore, in step S8, an air compressor grouting process is used to perform grouting reinforcement on the soil around the pipeline to form a composite foundation with a certain strength, so as to achieve the purpose of stabilizing the soil.

[0021] Furthermore, during grouting in step S8, special materials (sodium silicate) are appropriately added based on actual site conditions to enhance pourability and early strength. Once the pipe jacking is complete, the gap between the outer surface of the reinforced concrete pipe and the soil can be sealed. Cement slurry is then injected into the pipe using a water-cement ratio of 1:1. The grouting pressure is no less than 0.1 MPa, ensuring that all gaps around the pipe wall are completely filled. During construction, the pressure on the air compressor's pressure gauge and the slurry discharge from adjacent grouting holes should be monitored carefully.

[0022] Furthermore, the grouting operation in step S8 is as follows:

[0023] A1. Clean the hole and connect the grouting process pipeline: Lay out the grouting branch pipe according to the location of the reserved grouting hole in the pipeline. Each grouting branch pipe is equipped with a control gate valve.

[0024] A2. Grout injection: After the pipeline is laid, grouting begins with a grouting pressure of 0.05-0.1 MPa;

[0025] A3. Seal the grouting holes: Use quick-setting concrete to seal the grouting holes to prevent slurry loss;

[0026] A4. Flush the grouting pipe: After grouting is completed, the grouting pipe should be flushed with clean water immediately. Appropriate measures must be taken to treat wastewater and ensure proper cleaning. Strictly follow the pipe grouting operation procedures, with dedicated personnel performing the operation and quality inspectors inspecting to ensure strict quality control.

[0027] The human-machine trenchless pipe burying construction method produced by the technical solution of the present invention adopts a synchronous construction method of manual excavation and mechanical excavation, which greatly shortens the construction period, effectively reduces the demolition and excavation area of existing public infrastructure, reduces land occupation, ensures the quality of pipeline jacking construction, improves jacking efficiency, and reduces construction costs. It has been well received by owners and supervision units, and has accumulated valuable experience for future innovations in similar construction methods.

[0028] The improvement of trenchless construction technology also meets the national requirements for the promotion of ten new technologies in the construction industry;

[0029] This process uses manual excavation and mechanical excavation to be carried out simultaneously in opposite directions, upgrading the construction from a single working face to a double working face. While ensuring the quality of pipe jacking, it improves construction efficiency, greatly shortens the construction period, and has a good application effect. This technology has promoted the development of trenchless pipe burial construction technology and opened up the technical scope of multi-process synchronous construction. The use of this method avoids excavation work at the top position during the top construction process, which is beneficial to the conservation and utilization of land resources, and can effectively protect urban construction and existing urban infrastructure. The renovation of old and outdated water supply and drainage pipeline facilities in urban areas can effectively reduce the amount of demolition, local excavation of working wells for construction, and reduce damage to existing roads and public facilities. The hydraulic equipment used is low-noise, meets environmental protection requirements, and reduces the impact on the lives of surrounding residents. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the process structure of the human-machine top-to-top trenchless pipe burial construction method of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the plan view of the mechanical excavation working well of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the plan view of the artificial excavation working well of the present invention;

[0033] Figure 4 It is a structural schematic diagram of the measurement point distribution diagram of the present invention;

[0034] Figure 5 It is a structural schematic diagram of the axis positioning schematic diagram of the present invention;

[0035] Figure 6 It is a structural schematic diagram of the guide rail installation schematic diagram of the present invention;

[0036] Figure 7 It is a structural schematic diagram of the schematic diagram of grouting around the pipe position of the present invention;

[0037] Figure 8 is a schematic diagram of an example of the well chamber of the present invention;

[0038] Figure 9 This is a schematic diagram of the installation of the back wall and guide rails of the present invention;

[0039] Figure 10 This is an example diagram of the guide rail laying of the present invention;

[0040] Figure 11 This is an example diagram of on-site grouting according to the present invention;

[0041] Figure 12 This is a diagram showing an example of mechanical pipe jacking according to the present invention;

[0042] Figure 13 This is a schematic diagram of manual excavation and excavation of the present invention;

[0043] Figure 14 This is an example diagram of two working surfaces with a distance of 1 to 2 times the pipe diameter;

[0044] Figure 15 It is an example diagram of an internal example diagram of the present invention;

[0045] Figure 16 It is an example diagram of a grouting example diagram of the present invention; DETAILED DESCRIPTION

[0046] The present invention will be described in detail below with reference to the accompanying drawings. Figures 1 to 16 As shown in the figure, this is a non-excavation pipe burial construction method using humans and machines. Example

[0047] The man-machine top trenchless pipe burial construction method includes the following steps:

[0048] S1: According to the requirements of the designed pipeline position, the position of the jacking working well is extracted, and the positions of the two working wells are determined by RTK measurement system or total station.

[0049] S2: After determining the working location, based on the geological structure characteristics shown in the geological survey report, the jacking working well can be made of Larsen steel sheet piles or reinforced concrete according to the geological conditions and design requirements. The mechanical excavation working well is 11.5m*8.5m, and the manual excavation working well is 9.5m*7.5m. The working well size is determined by the equipment, pipeline diameter and working space. The back wall is reinforced with prefabricated equipment;

[0050] S3: Use the total station to determine points A1 and A2 of the mechanical operation working well and the manual operation working well respectively according to the coordinates on the drawing. Place the total station at point A1, look back at point A2, draw an extension line of the straight line A1A2, and determine point C1 at the rear of the mechanical operation working well and point C2 at the rear of the manual operation working well. Then, determine any points B1 and B2 at the bottom of the two wells, place the level at points B1 and B2 respectively, and determine the elevation of the pipeline centerline at the positions of points A1 and C1 and points A2 and C2 on the drawing. The straight line of the four points C1, A1, A2 and C2 is the jacking axis we are looking for.

[0051] S4: After the axis is determined, the rear backrest should be placed first, with the rear backrest 100-200mm away from the well wall. Adjust the rear backrest in the front and back and left and right directions, and try to ensure that the center of the rear backrest coincides with the axis. After the axis is determined, the guide rail and the rear top can be installed. First, calculate the height difference h from the top surface of the guide rail to the axis according to the size of the guide rail itself. Use a spirit level in the well and make 4-6 water points around the well to ensure that the axis elevation - water point elevation = h. When placing the guide rail, you can use a rope to draw a straight line at the two opposite water points, so that the top of the guide rail can lightly touch the rope. Then adjust the guide rail axis in the vertical direction according to the axis to coincide with the vertical projection line of the known axis. After the guide rail axis direction is adjusted, fine-tune the guide rail elevation, and finally support the guide rail to the well wall. Lead the axis to the front and back sides A of the well bottom. At point B, the working methods of the mechanical operation well and the manual operation well are the same. Split the backrest in the middle and make a midpoint C on the backrest. When placing the backrest, try to make point C on the extension line of AB. This value can be identified by naked eye, and the error should not be greater than 10cm. Set any two points D and D' at the edge of the backrest, and measure the distance between AD and AD'. It is only necessary to ensure that the distance between AD is approximately equal to the distance between AD'. The error should not be greater than 3cm. After the left and right directions of the guide rail are determined, fix one point on each side below, and then use a plumb line to adjust the front and rear directions. Finally, fill the gap between the well wall and the backrest with concrete of C15 to C30 according to the actual situation. The installation of the rear top is carried out after the installation of the backrest is completed. After leveling the rear top, the backrest can be fixed as long as the rear plane of the jack is firmly attached to the backrest.

[0052] S5: Grouting reinforcement is performed on the sand layer within 1m around the pipe position. The grouting ratio is determined through experiments to prevent the upper sand layer from collapsing and being lost along with the mud when the tunnel is pushed out.

[0053] S6: Check through the water level observation hole whether the precipitation effect outside the tunnel entrance meets the requirements; the annular gap between the tunnel entrance water stop ring and the machine head shell is uniform, sealed, and no mud flows in; the sealing door can be removed only after there is no obvious subsidence on the ground outside the tunnel; before leaving the tunnel, conduct a comprehensive inspection of all equipment to check whether the hydraulic, electrical, grouting, air pressure, water pressure, lighting, communication, ventilation and other operating systems can work normally, and whether various electric meters, pressure gauges, reversing valves, sensors, flow meters, etc. can correctly indicate that they are in working state. Then conduct linkage debugging and confirm that there are no faults before preparing to leave the tunnel. If there are any problems, adjust, repair or replace them in time;

[0054] S7: The mechanical excavation working face and the manual excavation working face are jacking forward simultaneously. When the two working faces are 3 to 5 times the pipe diameter apart, the manual excavation stops and the mechanical work continues. When the two working faces are 1 to 2 times the pipe diameter apart, the mechanical work stops and the manual excavation continues until all pipes are penetrated. The manual excavation work stops and all personnel are withdrawn. The mechanical excavation equipment does not move and only continues the jacking work until all the manually excavated pipes and the mechanical excavator heads are withdrawn from the manual excavation working shaft. The withdrawn pipes are transferred to the mechanical jacking working shaft and the jacking continues to complete the jacking work.

[0055] S8: After the jacking is completed, grouting reinforcement should be carried out around the pipe wall in a timely manner according to the grouting requirements to prevent settlement. Example

[0056] After the guide rails are installed in step S4, a secondary guide rail must be installed in the reserved hole. The axis and elevation of the secondary guide rail must be aligned with the primary guide rail. This secondary guide rail is used to prevent the machine head from lowering after entering the hole. The mud-water balanced pipe jacking equipment is used to prevent the mud bin from being blocked by suction. Example

[0057] In step S5, a bottom-up grouting method is used, and the construction steps are as follows:

[0058] After staking out and positioning, putting the drilling rig and grouting equipment in place, and drilling to the designed depth, pour sealing mud from the drill pipe, insert the one-way plastic valve tube to the designed elevation, wait for the sealing slurry to solidify, stir the cement slurry and insert the two-way sealed grouting core tube into the plastic, carry out grouting, lift 0.3m, and circulate the grouting and lifting until the slurry in the hole is filled to the hole mouth. Example

[0059] The grouting technical parameters in step S5 are: grouting hole spacing distribution: 2m; grouting pressure: 0.2-0.6MPa; grouting flow rate: 15-20L / min. Example

[0060] Before starting the tunneling system, ensure that there is sufficient hydraulic oil in the hydraulic pump group; each joint of the hydraulic oil hose and mud pipeline is reliable and the interfaces are correct; all control switches on the console are in neutral or stop position; all cables and electrical wiring are securely connected; the power supply meets the specified value; and the rotation direction of the motor is correct. Example

[0061] In step S6: after exiting the hole, measurement should be conducted at least once every 30 cm of jacking; during normal jacking, measurement should be conducted at least once every 0.5 m of jacking; additional measurement should be conducted 30 m before entering the receiving working well, and measurement should be conducted at least once every 30 cm of jacking; after each jacking process, the horizontal axis and elevation of the entire line must be remeasured, a pipeline jacking trajectory diagram must be drawn, and the construction quality supervision personnel must review and verify;

[0062] The machine head itself has a direction-guiding device, which makes the deviation correction operation simple. The operator only needs to ensure that the laser point is always in the center of the rake through the deviation correction action. There should be a strict layout review system and original records should be kept. The jacking correction can be carried out by adjusting the deviation correction jack. If the pipeline deviates to the left, the jack adopts the left extension and right retraction method; vice versa. If there are elevation and direction deviations at the same time, the side with the larger deviation should be corrected first. In the event of a large deviation, the development trend should be analyzed, and gradual corrections should be made in batches, with frequent adjustments and micro-corrections. In the manual excavation section, by adding a circular jacking iron to the front end of the first section of the pipe, the thrust of the rear-end pump station is used to squeeze the soil into the first section of the pipe. The construction workers excavate the soil in the first and second sections of the pipe, which also avoids the internal workers' over-excavation of the front end of the pipe, and has achieved good results in terms of jacking speed and deviation correction. Example

[0063] In step S8, an air compressor grouting process is used to perform grouting reinforcement on the soil around the pipeline to form a composite foundation with a certain strength, so as to achieve the purpose of stabilizing the soil. Example

[0064] During grouting in step S8, special materials (sodium silicate) are added as appropriate based on actual site conditions to enhance pourability and early strength. Once the pipe jacking is complete, the gap between the outer surface of the reinforced concrete pipe and the soil can be sealed. Cement slurry is then injected into the pipe using a water-cement ratio of 1:1. The grouting pressure should be no less than 0.1 MPa, ensuring that all gaps around the pipe wall are completely filled. During grouting, the pressure on the air compressor's pressure gauge and the slurry discharge from adjacent grouting holes should be monitored closely. Example

[0065] The grouting operation in step S8 is as follows:

[0066] A1. Clean the hole and connect the grouting process pipeline: Lay out the grouting branch pipe according to the location of the reserved grouting hole in the pipeline. Each grouting branch pipe is equipped with a control gate valve.

[0067] A2. Grout injection: After the pipeline is laid, grouting begins with a grouting pressure of 0.05-0.1 MPa;

[0068] A3. Seal the grouting holes: Use quick-setting concrete to seal the grouting holes to prevent slurry loss;

[0069] A4. Flush the grouting pipe: After grouting is completed, the grouting pipe should be flushed with clean water immediately. Appropriate measures must be taken to treat wastewater and ensure proper cleaning. Strictly follow the pipe grouting operation procedures, with dedicated personnel performing the operation and quality inspectors inspecting to ensure strict quality control.

[0070] This construction method adopts a construction method of manual excavation and mechanical excavation carried out simultaneously in opposite directions. While greatly shortening the construction period, it effectively reduces the demolition and excavation area of existing public infrastructure, reduces land occupation, ensures the quality of pipeline jacking construction, improves jacking efficiency, and reduces construction costs. It has been well received by owners and supervision units, and has accumulated valuable experience for future innovations in similar construction methods. The improvement of trenchless construction technology also meets the national requirements for the promotion of ten new technologies in the construction industry. This process adopts manual excavation and mechanical excavation carried out simultaneously in opposite directions, upgrading from single-working face construction to double-working face construction. While ensuring the quality of pipeline jacking, it improves construction efficiency, greatly shortens the construction period, and has a good application effect. This technology has promoted the development of trenchless pipe construction technology and opened up the technical scope of multi-process synchronous construction.

[0071] This method avoids excavation during top-to-top construction, facilitating land conservation and utilization, while effectively protecting urban development and existing infrastructure. Renovating old and obsolete water supply and drainage pipelines in urban areas can effectively reduce the amount of demolition and construction, while localized excavation of working wells minimizes damage to existing roads and public facilities. The hydraulic equipment used is low-noise, environmentally friendly, and minimizes the impact on surrounding residents.

[0072] Application Example 1

[0073] The expansion of the Liuqing River Second Wastewater Treatment Plant in Linyi City and its supporting pipe network project is located in the supporting pipe network project of Tianjin Road Section in Lanshan District, Linyi City. The jacking pipe is a DN1500 reinforced concrete pipe. The project started on June 1, 2020 and is scheduled for completion in 2021.

[0074] As of December 30, the cumulative jacking length reached 619.6 meters. The jacking progress was smooth using this method, and the pipe jacking speed was significantly increased. The quality met the design and specification requirements, and the application effect was good. According to calculations, the expansion of the Liuqing River Second Sewage Treatment Plant and its supporting pipe network project will be constructed using this method.

[0075] Compared with the traditional jacking method, the jacking quantity per working day is increased by 4 to 6 meters, the construction period is shortened by 20 days, and the cost is saved by 46,470 yuan.

[0076] Application Example 2

[0077] The construction of the sewage treatment plant and supporting pipe network project in Shanggu District, Linyi City, is located in the supporting pipe network project of Yitang Town, Lanshan District, Linyi City. The jacking pipe is a DN1200 reinforced concrete pipe. The project started on March 1, 2020 and was completed on October 13, 2021. The jacking length is 456.4 meters. The jacking was smooth when this method was applied, and the pipe jacking speed was greatly improved. The quality met the design and specification requirements, and the application effect was good. According to calculations, the construction of the sewage treatment plant and supporting pipe network project in Shanggu District using this method is faster than traditional jacking;

[0078] This method increased the amount of jacking by 4 to 6 meters per working day, shortened the construction period by 13 days, and saved costs of 34,230 yuan.

[0079] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Any changes that may be made to certain parts thereof by those skilled in the art all reflect the principles of the present invention and fall within the scope of protection of the present invention.

Claims

1. A man-machine top trenchless pipe burial construction method, characterized in that: The following steps are involved: S1: According to the requirements of the designed pipeline position, the position of the jacking working well is extracted, and the positions of the two working wells are determined by RTK measurement system or total station. S2: After determining the working location, based on the geological structure characteristics shown in the geological survey report, the jacking working well can be made of Larsen steel sheet piles or reinforced concrete according to the geological conditions and design requirements. The mechanical excavation working well is 11.5m*8.5m, and the manual excavation working well is 9.5m*7.5m. The working well size is determined by the equipment, pipeline diameter and working space. The back wall is reinforced with prefabricated equipment; S3: Use the total station to determine points A1 and A2 of the mechanical operation working well and the manual operation working well respectively according to the coordinates on the drawing. Place the total station at point A1, look back at point A2, draw an extension line of the straight line A1A2, and determine point C1 at the rear of the mechanical operation working well and point C2 at the rear of the manual operation working well. Then, determine any points B1 and B2 at the bottom of the two wells, place the level at points B1 and B2 respectively, and determine the elevation of the pipeline centerline at the positions of points A1 and C1 and points A2 and C2 on the drawing. The straight line of the four points C1, A1, A2 and C2 is the jacking axis we are looking for. S4: After the axis is determined, place the rear backrest first. The back of the rear backrest should be 100-200mm away from the well wall. Adjust the backrest in the front and back and left and right directions. Try to ensure that the center of the backrest coincides with the axis. After the axis is determined, you can install the guide rail and the rear top. First, calculate the height difference h from the top surface of the guide rail to the axis according to the size of the guide rail itself. Use a spirit level in the well and make 4-6 water points around the well to ensure that the axis elevation - water point elevation = h. When placing the guide rail, you can use a rope to draw a straight line at two opposite water points so that the top of the guide rail lightly touches the rope. Then adjust the guide rail axis in the vertical direction according to the axis to coincide with the vertical projection line of the known axis. After the guide rail axis direction is adjusted, fine-tune the guide rail elevation. Finally, support the guide rail to the well wall. Lead the axis to the front and back sides of the well bottom A , B. The working method of mechanical operation well is consistent with that of manual operation. Divide the backrest in the middle and make a middle point C on the backrest. When placing the backrest, try to make point C on the extension line of AB. This value can be identified by naked eye. The error should not be greater than 10cm. Set any two points D and D' at the edge of the backrest. Measure the distance between AD and AD'. Just make sure that the distance between AD is approximately equal to the distance between AD'. The error should not be greater than 3cm. After the left and right directions of the guide rail are determined, fix one point on each side below, and then use a plumb line to adjust the front and rear directions. Finally, fill the gap between the well wall and the backrest with concrete of C15 to C30 according to the actual situation. The installation of the rear top is carried out after the installation of the backrest is completed. After leveling the rear top, the backrest can be fixed as long as the rear plane of the jack is firmly attached to it. S5: Grouting reinforcement is performed on the sand layer within 1m around the pipe position. The grouting ratio is determined through experiments to prevent the upper sand layer from collapsing and being lost along with the mud when the tunnel is pushed out. S6: Check through the water level observation hole whether the precipitation effect outside the tunnel entrance meets the requirements; the annular gap between the tunnel entrance water stop ring and the machine head shell is uniform, sealed, and no mud flows in; the sealing door can be removed only after there is no obvious subsidence on the ground outside the tunnel; before leaving the tunnel, conduct a comprehensive inspection of all equipment to check whether the hydraulic, electrical, grouting, air pressure, water pressure, lighting, communication, ventilation and other operating systems can work normally, and whether various electric meters, pressure gauges, reversing valves, sensors, flow meters, etc. can correctly indicate that they are in working state. Then conduct linkage debugging and confirm that there are no faults before preparing to leave the tunnel. If there are any problems, adjust, repair or replace them in time; S7: The mechanical excavation working face and the manual excavation working face are jacking forward simultaneously. When the two working faces are 3 to 5 times the pipe diameter apart, the manual excavation stops and the mechanical work continues. When the two working faces are 1 to 2 times the pipe diameter apart, the mechanical work stops and the manual excavation continues until all pipes are penetrated. The manual excavation work stops and all personnel are withdrawn. The mechanical excavation equipment does not move and only continues the jacking work until all the manually excavated pipes and the mechanical excavator heads are withdrawn from the manual excavation working shaft. The withdrawn pipes are transferred to the mechanical jacking working shaft and the jacking continues to complete the jacking work. S8: After the jacking is completed, grouting reinforcement should be carried out around the pipe wall in a timely manner according to the grouting requirements to prevent settlement.

2. The method for trenchless pipe burial by man-machine top-to-top according to claim 1 is characterized in that: After the guide rail is installed in step S4, a secondary guide rail needs to be installed in the reserved hole. The axis and elevation of the secondary guide rail must be consistent with the main rail. This secondary guide rail is used to prevent the machine head from lowering after entering the hole. The mud-water balance pipe jacking equipment is used to prevent the mud bin from being sucked and blocked.

3. The method for trenchless pipe burial by man-machine top-to-top according to claim 1 is characterized in that: In step S5, a bottom-up grouting method is used, and the construction steps are as follows: After staking out and positioning, putting the drilling rig and grouting equipment in place, and drilling to the designed depth, pour sealing mud from the drill pipe, insert the one-way plastic valve tube to the designed elevation, and after the sealing slurry solidifies, stir the cement slurry and insert the two-way sealed grouting core tube into the plastic. The grouting is lifted 0.3m, and the slurry in the hole is filled to the hole mouth through the circulating grouting.

4. The method for trenchless pipe burial by man-machine top-to-top construction according to any one of claims 1 or 3, characterized in that: The grouting technical parameters in step S5 are: grouting hole spacing distribution: 2m; grouting pressure: 0.2-0.6MPa; grouting flow rate: 15-20L / min.

5. The method for trenchless pipe burial by man-machine top-to-top construction according to claim 1 is characterized in that: Before starting the tunneling equipment, ensure that there is sufficient hydraulic oil in the hydraulic pump group; each joint of the hydraulic oil hose and mud pipeline is reliable and the interfaces are correct; all control switches on the console are in neutral or stop position; all cables and electrical wiring are securely connected; the power supply meets the specified value; and the rotation direction of the motor is correct.

6. The method for trenchless pipe burial by man-machine top-to-top according to claim 1 is characterized in that: In step S6: after exiting the hole, measurement should be conducted at least once every 30 cm of jacking; during normal jacking, measurement should be conducted at least once every 0.5 m of jacking; additional measurement should be conducted 30 m before entering the receiving working well, and measurement should be conducted at least once every 30 cm of jacking; after each jacking process, the horizontal axis and elevation of the entire line must be remeasured, a pipeline jacking trajectory diagram must be drawn, and the construction quality supervision personnel must review and verify; The machine head itself has a direction induction device, which makes the correction operation simple. The operator only needs to ensure that the laser point is always in the center of the rake through the correction action. There should be a strict layout and review system, and original records should be kept. The jacking correction can be carried out by adjusting the correction jack. If the pipeline deviates to the left, the jack adopts the left extension and right retraction method; vice versa. If there are elevation and direction deviations at the same time, correct the side with the larger deviation first. If a large deviation occurs, analyze the development trend, adopt step-by-step correction, and make frequent adjustments and micro-corrections. In the manual excavation section, by adding a circular jacking iron at the front end of the first section of the pipe, the thrust of the rear-end pump station is used to squeeze the soil into the first section of the pipe. The construction workers dig and construct in the first and second sections of the pipeline, which also avoids the over-excavation of the front end of the pipeline by the internal workers, and has achieved good results in terms of jacking speed and correction.

7. The method for trenchless pipe burial by man-machine top-to-top construction according to claim 1 is characterized in that: In step S8, an air compressor grouting process is used to perform grouting reinforcement on the soil around the pipeline to form a composite foundation with a certain strength, so as to achieve the purpose of stabilizing the soil.

8. The method for trenchless pipe burial by man-machine top-to-top construction according to claim 1 is characterized in that: During grouting in step S8, sodium silicate will be appropriately added according to the actual situation on site to increase the pourability and early strength. After the jacking construction is completed, the gap between the outer side of the reinforced concrete pipe and the soil can be sealed, and cement slurry is injected into the pipe with a water-cement ratio of 1:

1. The pressure during grouting is not less than 0.1 MPa, and the gaps around the pipe wall are filled. During construction, pay attention to observe the pressure of the pressure instrument of the air compressor and the slurry discharge from adjacent grouting holes.

9. The method for trenchless pipe burial by man-machine top-to-top construction according to claim 1, characterized in that: The grouting operation in step S8 is as follows: A1. Hole cleaning and connection of grouting process pipelines: Layout grouting branches according to the locations of the reserved grouting holes in the pipelines. Each grouting branch is equipped with a control gate valve. A2. Grout injection: After the pipeline is laid, grouting begins with a grouting pressure of 0.05-0.1 MPa; A3. Seal the grouting holes: Use quick-setting concrete to seal the grouting holes to prevent slurry loss; A4. Flushing the grouting pipe: After the grouting is completed, the grouting pipe should be flushed with clean water immediately. Appropriate measures must be taken to treat the wastewater, and the cleaning work must be done well. The jacking grouting operating procedures must be strictly implemented. The operation must be carried out by a dedicated person, and the quality inspector must strictly control the quality.

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