Jacking construction process for large-diameter inorganic high-performance fiber composite material jacking pipe

Abstract

A large-diameter inorganic high-performance fiber composite material pipe jacking construction technology comprises the following steps that after foundation pit excavation is conducted at a preset position, a well wall is built, a concrete cushion layer is laid, and preparation of a working well and a receiving well is completed; an outlet of the pipe jacking set is preset in the well wall in the working well, then a rear seat backup plate and a rear seat jack are sequentially installed on the front side of the pressure bearing wall, a hole opening water stop device is installed at the outlet of the pipe jacking set, and preparation of jacking equipment is completed; a heading machine, a jacking pipe connected with the heading machine, a slurry separator and a grouting ring arranged on the outer periphery of the jacking pipe are arranged between the rear seat jack and the outlet of the jacking pipe group; under the pushing action of the rear seat jack, the heading machine and the pipe jacking set are sequentially jacked out of the receiving well, and after the section, close to the heading machine, of the pipe jacking set is jacked and pushed into the receiving well, cable tunnel construction of the section is completed. According to the invention, the abrasion and fracture of the jacking pipe in the jacking process can be reduced, and the jacking smoothness of the jacking pipe is improved.

Description

Technical Field

[0001] The invention relates to an improvement of a jacking construction technology, belongs to the field of tunnel engineering, and in particular to a jacking construction process for a large-diameter inorganic high-performance fiber composite material jacking pipe. Background Art

[0002] Pipe jacking construction is a soil underground engineering construction method developed after shield construction. It is mainly used for the construction of underground water pipes, drainage pipes, gas pipes, and telecommunication cable pipes. It does not require excavation of the surface layer and can cross roads, railways, rivers, ground buildings, underground structures, and various underground pipelines. It is a non-excavation method for constructing underground pipelines. During construction, a pipe jacking working well and a receiving well are first made as the starting point and end point of a section of pipe jacking. There are reserved holes on one or two sides of the well wall in the working well as the outlet of the pipe jacking. The opposite well wall is the pressure-bearing wall. The front side of the pressure-bearing wall is equipped with a jacking jack and a pressure pad (i.e., a steel backrest) for the pipe jacking. The jack pushes the tool pipe out of the reserved hole in the working well, and then, with the tool pipe as the guide, the prefabricated pipe sections are pushed into the soil layer section by section according to the design axis until the first section of the pipe section behind the tool pipe enters the reserved hole of the receiving well, and a section of the pipeline is completed.

[0003] In the jacking work, the mud-water balance tunnel boring machine currently used, as the jacking distance increases, the tool wear, cutter head breakage, cutter drop, etc. at the end of the tunnel boring machine directly threaten the edge of the cutter disc. The wear of the cutter disc reduces the cutting surface of the cutter body. The development from cutting and discharging jacking to cutting and extrusion jacking will cause the ground to bulge, and the front resistance and external friction will increase. Extrusion jacking in hard soil layers with small compression modulus cannot jack pipes for long distances. The surface of the pipe exposed shallowly is easy to bulge, the head of the machine is upturned, and the axis cannot be controlled. The soil pressure above the deep pipe is large and the stress cannot be released. The surface will not bulge and deform. The stress release in the soil is time-sensitive. The stress release process is the process of the soil holding the outer wall of the pipe, which increases the jacking resistance, causing a series of problems such as damage to the hydraulic system, pipe mouth breakage, and work well wall breakage, leading to pipe jacking failure.

[0004] A Chinese patent application with application number CN202310896264.9 and application date July 20, 2023 discloses a grouting device for a jacking pipe relay room and a jacking pipe closing construction method. The grouting device includes a walking body, which is electrically connected to a controller; a lifting assembly, used to clamp the steel formwork and lift the steel formwork to a designated position in the relay room, installed on the walking body; and a grouting assembly, used to grout the steel formwork installed at the designated position in the relay room, and the grouting assembly is installed on the walking body. The device provided by the invention can replace the operating personnel to complete this construction task, avoiding safety hazards such as electric shock, harmful gases, and falling objects caused by various uncertain factors in the jacking pipe; the various components of the grouting device in the invention are produced in a modular manner and can be lengthened according to the actual size of the site, and are highly practical; however, the above technology does not solve the problems of wear and breakage during the jacking process of the jacking pipe.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0006] The purpose of the present invention is to overcome the problems of wear and breakage in the pipe jacking process in the prior art, and to provide a large-diameter inorganic high-performance fiber composite pipe jacking construction process that reduces wear and breakage in the pipe jacking process.

[0007] To achieve the above purpose, the technical solution of the present invention is: a large-diameter inorganic high-performance fiber composite material jacking construction process, the large-diameter inorganic high-performance fiber composite material jacking construction process comprises the following steps:

[0008] The first step is to dig the foundation pit at the predetermined location, build the well wall and lay the concrete cushion layer, and then complete the preparation of the working well and the receiving well;

[0009] The second step is to preset the outlet of the jacking group on the well wall in the working well, set the well wall opposite to the outlet of the jacking group as the pressure-bearing wall, and then install the rear seat back plate and the rear seat jack in sequence on the front side of the pressure-bearing wall, and install the hole water stop device at the outlet of the jacking group, so as to complete the preparation of the jacking equipment;

[0010] The third step is to install a top pipe connected to the tunnel boring machine, a grouting device and a grouting ring arranged on the outer side of the top pipe between the rear seat jack and the top pipe group outlet. The grouting device corresponds to the position of the grouting ring, and the grouting device rotates around the top pipe.

[0011] The fourth step is to use the pushing effect of the rear seat jack to push the tunnel boring machine and the jacking pipe group to the receiving well in turn. During the pushing process, the mud in the slurry distributor is input into the grouting ring, and the mud is sprayed along the outer periphery of the jacking pipe through the grouting ring. The pressure between the jacking pipe and the tunnel makes the mud lubricate the outer periphery of the jacking pipe. After a section of the jacking pipe close to the tunnel boring machine in the jacking pipe group is pushed into the receiving well, the construction of this part of the cable tunnel is completed.

[0012] During the ejection process, multiple jacking pipes respectively perform lubrication and drag reduction operations on the head of the tunnel boring machine by synchronous grouting and grouting along the line.

[0013] The multiple jacking pipes are used to synchronously grout the heads of the tunnel boring machines respectively, and the heads of the tunnel boring machines are synchronously grouted to form an original grout sleeve to fill the inherent gap between the heads of the tunnel boring machines and the jacking pipe sections as well as the correction gap generated by the correction.

[0014] During the grouting process along the line, each section of the jacking pipe connected section by section is grouted radially outward, and the missing grouting sleeve caused by the loss of water in the lubricating grout along the tunnel line is supplemented.

[0015] The middle side of the top pipe is provided with a grouting ring, the inner side of the top pipe is provided with a slurry divider and a plurality of multi-segment diversion pipes in sequence, the slurry divider rotates along the inner side of the top pipe, the plurality of multi-segment diversion pipes are evenly distributed in an annular manner on the inner side of the slurry divider, the slurry in the slurry divider is input into the grouting ring by the diversion pipe, an input pipe is provided on the outer side of the slurry divider, and the slurry divider and the top pipe are arranged at the same center of a circle;

[0016] One end of the input pipe is connected to the grouting pump, and the other end of the input pipe is connected to the grouting distributor; a plurality of grouting holes distributed in an annular shape are arranged on the outer periphery of the grouting ring.

[0017] The inner wall of the top pipe is symmetrically provided with a first inner groove and a second inner groove, and both ends of the grouting ring extend inward to form a positioning portion, and the first insertion portion and the second insertion portion are respectively provided on the side of the positioning portion close to the top pipe, the first insertion portion is plugged into the corresponding first inner groove, and the second insertion portion is plugged into the corresponding second inner groove.

[0018] The slurry divider comprises a fixed seat, a rotating ring and a plurality of blades, the outer periphery of the fixed seat is connected to the inner periphery of the top pipe, the side of the fixed seat is connected to the side of the rotating ring, the side of the rotating ring is located at the inner periphery of the fixed seat and is provided with a plurality of blades, all the multi-section flow dividers are arranged on the other side of the rotating ring, and all the multi-section flow dividers are evenly distributed with the center of the rotating ring as the center;

[0019] The plurality of multi-section flow dividers are arranged alternately with the plurality of blades.

[0020] The fixing seat includes an outer ring portion, an inner ring portion, a closed end and a positioning ring. The inner ring portion is arranged on the inner side of the outer ring portion. The inner ring portion and the side of the outer ring portion are connected through the closed end. The outer ring portion, the inner ring portion and one side of the closed end are open and the other side is closed. The positioning ring is arranged on the inner wall of the outer ring portion and is used to cooperate with the installation and positioning of the rotating ring.

[0021] The rotating ring is embedded between the outer ring portion and the inner ring portion, and the plurality of blades are movably arranged between the outer ring portion and the inner ring portion, and one side of the rotating ring where the blades are installed is in contact with the positioning ring;

[0022] A plurality of independent cavities are formed between the blades and the outer ring portion and the inner ring portion, and the blades stir the mud in the plurality of independent cavities.

[0023] The input pipes are respectively connected to a plurality of independent cavities, and the input pipes transport the slurry to the plurality of cavities.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. In the construction process of large-diameter inorganic high-performance fiber composite material jacking pipe of the present invention, the driving effect of the rear seat jack is used to push the tunnel boring machine and the jacking pipe group to the receiving well in sequence. After a section of the jacking pipe close to the tunnel boring machine in the jacking pipe group is pushed into the receiving well, the construction of this part of the cable tunnel is completed. When used, the tunnel boring machine head and tail can be used for synchronous grouting and grouting along the jacking pipe. During the grouting process along the line, each section of the jacking pipe is grouted radially outward, and the loss of the slurry sleeve caused by the loss of water in the lubricating slurry along the pipeline is supplemented, which can reduce the wear and tear during the jacking process of the jacking pipe and improve the smoothness of the jacking of the jacking pipe. Therefore, this design reduces the damage to the jacking pipe and improves the jacking efficiency.

[0026] 2. In a large-caliber inorganic high-performance fiber composite material jacking construction process of the present invention, a grouting ring is arranged on the middle side of the jacking pipe, a slurry distributor and a plurality of multi-segment diversion pipes are arranged in sequence on the inner side of the jacking pipe, the slurry distributor rotates along the inner side of the jacking pipe, and a plurality of multi-segment diversion pipes are evenly distributed in an annular manner on the inner side of the slurry distributor. The slurry in the slurry distributor can be input into the grouting ring by the diversion pipe, and an input pipe is arranged on the outer side of the slurry distributor. The slurry distributor and the jacking pipe are arranged at the same center of the circle. When applied, the input pipe can make the slurry impact the blades during the process of inputting pressurized slurry, and make the blades drive the rotating ring, the diversion pipe and the grouting ring to rotate, and the slurry can be sprayed outward by the grouting ring, so as to evenly form a slurry sleeve between the jacking pipe and the inner wall of the pit, and the inner cavity of the input pipe faces a plurality of independent cavities, so that the input slurry can impact the blades of the independent cavities, ensuring the uniform outward spraying of the slurry, making the jacking pipe excavation process smoother and safer. Therefore, the present invention is safe to use and simple to operate.

[0027] 3. In a large-caliber inorganic high-performance fiber composite material jacking construction process of the present invention, two first inner grooves and a second inner groove are symmetrically arranged on the inner wall of the jacking pipe, and the two ends of the grouting ring extend inward to form a positioning part, and the first insertion part and the second insertion part are respectively arranged on the side of the positioning part close to the jacking pipe, and the first insertion part is plugged into the corresponding first inner groove, and the second insertion part is plugged into the corresponding second inner groove. The first insertion part and the second insertion part are respectively inserted into the first inner groove and the second inner groove, which makes the assembly more convenient and the connection more stable, so that the grouting ring can be restricted to rotate at a predetermined position, and the grouting ring can be prevented from moving along its axial direction. Therefore, the present invention has a stable connection and is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a flow chart of the present invention.

[0029] Figure 2 It is a structural schematic diagram of the present invention.

[0030] Figure 3 It is a structural schematic diagram of the pulp separator in the present invention.

[0031] Figure 4 It is a cross-sectional view of the jacking pipe group in the present invention.

[0032] Figure 5 The present invention Figure 4 Enlarged view of point A in the middle.

[0033] Figure 6 It is an exploded view of the pulp divider in the present invention.

[0034] In the figure: a jacking pipe 1, a first inner groove 11, a second inner groove 12, a slurry divider 2, a fixing seat 21, an outer ring portion 211, an inner ring portion 212, a closed end 213, a positioning ring 214, a rotating ring 22, blades 23, an input pipe 3, a diverter pipe 4, a grouting ring 5, a positioning portion 51, a first insertion portion 52, a second insertion portion 53, a grouting hole 54, and a jacking pipe group 6. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] See also Figures 1 to 6 A large-diameter inorganic high-performance fiber composite material jacking construction process, the large-diameter inorganic high-performance fiber composite material jacking construction process comprises the following steps:

[0037] The first step is to dig the foundation pit at the predetermined location, build the well wall and lay the concrete cushion layer, and then complete the preparation of the working well and the receiving well;

[0038] The second step is to preset the outlet of the jacking group on the well wall in the working well, set the well wall opposite to the outlet of the jacking group as the pressure-bearing wall, and then install the rear seat back plate and the rear seat jack in sequence on the front side of the pressure-bearing wall, and install the hole water stop device at the outlet of the jacking group, so as to complete the preparation of the jacking equipment;

[0039] Step 3: Install a top pipe 1 connected to the top pipe 1, a grouting device 2 and a grouting ring 5 arranged on the outer side of the top pipe 1 between the rear seat jack and the top pipe group outlet. The grouting device 2 corresponds to the position of the grouting ring 5, and the grouting device 2 rotates around the top pipe 1.

[0040] The fourth step is to use the pushing effect of the rear seat jack to push the tunnel boring machine and the jacking pipe group to the receiving well in turn. During the pushing process, the mud in the slurry distributor 2 is input into the grouting ring 5, and the mud is sprayed along the outer periphery of the jacking pipe 1 through the grouting ring 5. The mud lubricates the outer periphery of the jacking pipe 1 through the pressure between the jacking pipe 1 and the tunnel. After a section of the jacking pipe 1 close to the tunnel boring machine in the jacking pipe group is pushed into the receiving well, the construction of this part of the cable tunnel is completed.

[0041] During the ejection process, the plurality of jacking pipes 1 respectively perform lubrication and drag reduction operations of synchronous grouting and grouting along the line on the head of the tunnel boring machine.

[0042] The multiple jacking pipes 1 are used to synchronously grout the heads of the tunnel boring machines respectively, and the heads of the tunnel boring machines are synchronously grouted to form an original grout sleeve to fill the inherent gap between the heads of the tunnel boring machines and the pipe sections of the jacking pipes 1 and the correction gap generated by the correction.

[0043] During the grouting process along the line, each section of the jacking pipe 1 connected section by section is grouted radially outward, and the missing grouting sleeve caused by the loss of water in the lubricating grout along the tunnel line is supplemented.

[0044] The middle side of the top pipe 1 is provided with a grouting ring 5, and the inner side of the top pipe 1 is provided with a slurry divider 2 and a plurality of multi-segment diverter pipes 4 in sequence. The slurry divider 2 rotates along the inner side of the top pipe 1, and the plurality of multi-segment diverter pipes 4 are evenly distributed in an annular shape on the inner side of the slurry divider 2. The slurry in the slurry divider 2 is input into the grouting ring 5 by the diverter pipe 4. An input pipe 3 is provided on the outer side of the slurry divider 2. The slurry divider 2 and the top pipe 1 are arranged at the same center of a circle.

[0045] One end of the input pipe 3 is connected to the grouting pump, and the other end of the input pipe 3 is connected to the grouting distributor 2; a plurality of grouting holes 54 distributed in an annular shape are arranged on the outer periphery of the grouting ring 5.

[0046] A first inner groove 11 and a second inner groove 12 are symmetrically arranged on the inner wall of the top pipe 1. Both ends of the grouting ring 5 extend inward to form a positioning portion 51. A first insertion portion 52 and a second insertion portion 53 are respectively arranged on one side of the positioning portion 51 close to the top pipe 1. The first insertion portion 52 is plugged into the corresponding first inner groove 11, and the second insertion portion 53 is plugged into the corresponding second inner groove 12.

[0047] The slurry divider 2 includes a fixed seat 21, a rotating ring 22 and a plurality of blades 23. The outer periphery of the fixed seat 21 is connected to the inner periphery of the top pipe 1, and the side of the fixed seat 21 is connected to the side of the rotating ring 22. The side of the rotating ring 22 is located at the inner periphery of the fixed seat 21 and is provided with a plurality of blades 23. All multi-segment diverter pipes 4 are arranged on the other side of the rotating ring 22, and all multi-segment diverter pipes 4 are evenly distributed with the center of the rotating ring 22 as the center.

[0048] The plurality of multi-section flow dividers 4 and the plurality of blades 23 are arranged alternately.

[0049] The fixing seat 21 includes an outer ring portion 211, an inner ring portion 212, a closed end 213 and a positioning ring 214. The inner ring portion 212 is arranged on the inner side of the outer ring portion 211. The inner ring portion 212 and the side of the outer ring portion 211 are connected through the closed end 213. One side of the outer ring portion 211, the inner ring portion 212 and the closed end 213 are open and the other side is closed. The positioning ring 214 is arranged on the inner wall of the outer ring portion 211 and is used to cooperate with the installation and positioning of the rotating ring 22.

[0050] The rotating ring 22 is embedded between the outer ring portion 211 and the inner ring portion 212, and the plurality of blades 23 are movably arranged between the outer ring portion 211 and the inner ring portion 212, and one side of the rotating ring 22 where the blades 23 are installed is in contact with the positioning ring 214;

[0051] The blades 23 form a plurality of independent cavities between the outer ring portion 211 and the inner ring portion 212 , and the blades 23 stir the slurry in the plurality of independent cavities.

[0052] The input pipes 3 are respectively connected to a plurality of independent cavities, and the input pipes 3 transport the slurry to the plurality of cavities.

[0053] Embodiment 1:

[0054] A large-diameter inorganic high-performance fiber composite material jacking construction process, the large-diameter inorganic high-performance fiber composite material jacking construction process comprising the following steps:

[0055] S1. Excavate the foundation pit at the predetermined location, build the well wall and lay the concrete cushion, and complete the preparation of the working well and receiving well;

[0056] S2. The outlet of the jacking group is preset on the well wall in the working well, the well wall opposite to the outlet of the jacking group is set as the pressure-bearing wall, and then the rear seat backing plate and the rear seat jack are installed in sequence on the front side of the pressure-bearing wall, and the hole water stop device is installed at the outlet of the jacking group, thereby completing the preparation of the jacking equipment;

[0057] S3, installing a top pipe 1 connected to the top pipe 1, a grouting device 2 and a grouting ring 5 arranged on the outer side of the top pipe 1 between the rear seat jack and the top pipe group outlet, the grouting device 2 and the grouting ring 5 are located at positions corresponding to each other, and the grouting device 2 rotates around the top pipe 1;

[0058] S4. Using the pushing action of the rear seat jack, the tunnel boring machine and the jacking pipe group are pushed out to the receiving well in sequence. During the pushing process, the mud in the slurry distributor 2 is input into the grouting ring 5, and the mud is sprayed out along the outer periphery of the jacking pipe 1 through the grouting ring 5. The mud lubricates the outer periphery of the jacking pipe 1 through the pressure between the jacking pipe 1 and the tunnel. After a section of the jacking pipe 1 close to the tunnel boring machine in the jacking pipe group is pushed into the receiving well, the construction of this part of the cable tunnel is completed; during the pushing process, multiple jacking pipes 1 respectively perform lubrication and drag reduction operations of synchronous grouting and grouting along the line on the tunnel boring machine head. The tunnel boring machine head synchronously grouts to form an original slurry sleeve, fill the inherent gap between the tunnel boring machine head and the jacking pipe 1 pipe section and the correction gap generated by the correction; during the grouting along the line, each section of the jacking pipe 1 connected section by section is grouted outward along its radial direction, and the slurry sleeve loss caused by the loss of water in the lubricating slurry along the tunnel is supplemented.

[0059] Embodiment 2:

[0060] Embodiment 2 is substantially the same as Embodiment 1, except that:

[0061] The middle side of the jacking pipe 1 is provided with a grouting ring 5, and the inner side of the jacking pipe 1 is provided with a slurry divider 2 and a plurality of multi-segment diversion pipes 4 in sequence. The slurry divider 2 rotates along the inner side of the jacking pipe 1, and the plurality of multi-segment diversion pipes 4 are evenly distributed in an annular manner on the inner side of the slurry divider 2. The slurry in the slurry divider 2 can be input into the grouting ring 5 by using the diversion pipe 4. An input pipe 3 is provided on the outer side of the slurry divider 2, and the slurry divider 2 is arranged at the same center as the jacking pipe 1; one end of the input pipe 3 is connected to the grouting pump, and the other end of the input pipe 3 is connected to the grouting pump. The grouting ring 5 is connected to the slurry device 2; a plurality of annularly distributed grouting holes 54 are arranged on the outer periphery of the grouting ring 5; two first inner grooves 11 and a second inner groove 12 are symmetrically arranged on the inner wall of the top pipe 1, and both ends of the grouting ring 5 extend inward to form a positioning portion 51, and a first insertion portion 52 and a second insertion portion 53 are respectively arranged on one side of the positioning portion 51 close to the top pipe 1, the first insertion portion 52 is plugged into the corresponding first inner groove 11, and the second insertion portion 53 is plugged into the corresponding second inner groove 12.

[0062] When applying:

[0063] The first inserting portion 52 and the second inserting portion 53 are respectively inserted into the first inner groove 11 and the second inner groove 12 , so that the grouting ring 5 can be restricted to rotate at a predetermined position and the grouting ring 5 can be prevented from moving along its axial direction.

[0064] Embodiment 3:

[0065] Embodiment 3 is substantially the same as Embodiment 1, except that:

[0066] The pulp divider 2 includes a fixed seat 21, a rotating ring 22 and a plurality of blades 23. The outer periphery of the fixed seat 21 is connected to the inner periphery of the top pipe 1, and the side of the fixed seat 21 is connected to the side of the rotating ring 22. The side of the rotating ring 22 is located on the inner periphery of the fixed seat 21 and is provided with a plurality of blades 23. All multi-segment diverter pipes 4 are arranged on the other side of the rotating ring 22, and all multi-segment diverter pipes 4 are evenly distributed with the center of the rotating ring 22 as the center; the plurality of multi-segment diverter pipes 4 and the plurality of blades 23 are arranged alternately; the fixed seat 21 includes an outer ring portion 211, an inner ring portion 212, a closed end 213 and a positioning ring 214. The inner ring portion 212 is arranged on the inner side of the outer ring portion 211, and the inner ring portion 2 12 is connected to the side of the outer ring part 211 through the closed end 213, the outer ring part 211, the inner ring part 212 and one side of the closed end 213 are open and the other side is closed, the positioning ring 214 is arranged on the inner wall of the outer ring part 211 and is used to cooperate with the installation and positioning of the rotating ring 22; the rotating ring 22 is embedded between the outer ring part 211 and the inner ring part 212, and the plurality of blades 23 are movably arranged between the outer ring part 211 and the inner ring part 212, and one side of the rotating ring 22 where the blades 23 are installed is in contact with the positioning ring 214; the blades 23 form a plurality of independent cavities between the outer ring part 211 and the inner ring part 212, and the input pipe 3 is respectively connected with the plurality of independent cavities.

[0067] When applying:

[0068] During the process of inputting pressurized slurry, the input pipe 3 can make the slurry impact the blades 23, and make the blades 23 drive the rotating ring 22, the diverter pipe 4 and the grouting ring 5 to rotate, and the grouting ring 5 can be used to spray the slurry outward, so as to evenly form a slurry jacket between the top pipe 1 and the inner wall of the pit, and the inner cavity of the input pipe 3 faces multiple independent cavities, so that the input slurry can impact the blades 23 of the independent cavities.

[0069] Embodiment 4:

[0070] Embodiment 4 is substantially the same as Embodiment 1, except that:

[0071] The rear jack system involved in the present invention also includes a multifunctional base frame, which not only serves as a load-bearing structure, but also integrates a fine-tuning jack and a horizontal support to accurately adjust the elevation and horizontal position. Two sets of tracks are designed on the top of the base frame. The inner track is used to support and guide the gold digger and the jacking pipe, while the outer track is for the jacking ring to reciprocate on it.

[0072] The core component of the rear seat jack is its cylinder group, which consists of six cylinders, divided into two rows and arranged symmetrically, with three cylinders in each row stacked and fixed by detachable supports, and then integrated by connecting beams. These cylinders use domestically produced double-stroke, double-acting hydraulic jacks, and the maximum thrust of each cylinder reaches 194KN. The total equipment thrust is 1164KN, which is enough to meet the maximum 8KN jacking force requirement of the pipe segment. The stroke of the cylinder is 3.5 meters, which is enough to continuously push a pipe segment with a length of 2.5 meters at a time without the need for additional pads, thereby improving work efficiency and reducing labor intensity;

[0073] For the hydraulic pump station, a 63SCY14-1B manual variable axial piston oil pump was selected, matched with a Y18L-4 motor. Through variable frequency speed regulation technology, the oil pump flow can be flexibly adjusted according to the actual working conditions during the jacking process to achieve precise control of the jacking speed of the main jacking cylinder. In addition, the system supports remote control operation to ensure that the oil pressure and speed of the jack piston are reasonably controlled when it retreats. The initial jacking is slow, and the jacking is carried out at a normal speed after the contact parts are tightly combined. During the jacking process, if the oil pressure rises abnormally, the operation must be stopped immediately, and the cause must be found out and properly handled before continuing;

[0074] The jacking ring part is composed of a top ring and a top seat. The top ring is fixed to the top seat by bolts. There are rollers at the bottom of the top seat, which can move back and forth freely on the outer track of the bottom frame. The installation of the back seat plate must ensure that it is perpendicular to the jacking axis, and the gap between it and the well wall is filled with plain concrete. The area of ​​the jacking back seat is at least 4m×3m to ensure that the overall force is uniform and effective;

[0075] At the bottom of the working well, a high-power pipeline pump can also be configured to lift the mud transported horizontally to the bottom of the well vertically to the ground sedimentation tank. The water supply pipeline of the water system adopts DN1 steel pipe, and the pipe joints adopt clamp-type flexible joints. A high-power pipeline pump is installed at the ground water source for pressurized water supply;

[0076] Grouting equipment system is crucial for long-distance pipe jacking construction. It can timely and effectively inject thixotropic mud around the pipe joints, form and maintain a good mud sleeve, and play a significant friction reduction effect, which often determines the success of the pipe jacking project. Wireless walkie-talkies and mobile phones are used for communication in underground pipelines, which are set up at the tunneling machine operating table, the working shaft jacking console, the ground and the relay room to enhance communication and coordination and command of operations.

[0077] In terms of ventilation facilities, a diesel air compressor is used to generate compressed air, which is then transported to the front end of the pipeline through a filter and an air storage tank through an air pressure regulating valve. At the same time, old air is discharged to achieve air circulation, ensure the freshness of the air quality in the pipeline, and eliminate any harmful gases that may be produced.

[0078] In terms of power configuration, the construction site should be equipped with dual power supplies and automatic switching functions. The power and lighting systems should be powered separately, and the mobile lighting on the work surface should be powered by low voltage. Since the motor in the pipeline uses 38V power, the power wires entering the pipeline need to take secondary protection and grounding protection measures. The wires should be placed in places that are not easily accessible to operators, and a sheath should be installed on the outside to ensure safety. Considering the high humidity in the pipeline, 36V low-voltage lighting electricity is used for lighting electricity, and waterproof and explosion-proof lamps are used after the voltage is reduced by a transformer.

[0079] The water-stopping device at the opening of the pipe jacking project is ingeniously designed to ensure soil and water conservation and mud management during the construction process. The core part of the device is the external sealing door, which is made of high-strength 3# channel steel. Its inner and outer surfaces are covered with waterproof glass cloth and special waterproof coating to enhance the sealing performance. The external sealing door is welded and fixed to the embedded iron parts of the opening through two horizontal 3# channel steel beams to form a stable supporting structure. The design of the external sealing door is cleverly made so that its bottom is 2 mm lower than the opening and embedded in the preset wedge-shaped groove, while the upper part is 3 mm above the ground and is tightly connected to the well body steel bars. This not only enhances the stability of the structure, but also effectively prevents the external sealing door from falling off during the caisson sinking process.

[0080] Before the tunnel boring machine exits the tunnel, a special water stop will be installed at the tunnel entrance. This measure has two purposes: first, to prevent water and soil from pouring into the working well from the front when the tunnel boring machine exits the tunnel, causing the construction environment to deteriorate; second, to prevent the loss of drag-reducing mud injected during the jacking process, to ensure that a complete and effective mud sleeve can be formed. In addition, thixotropic mud can be injected between the two layers of rubber water stop plates, so that when the pipe section exits the tunnel, it can be immediately wrapped by mud, further improving the water-stopping effect; for construction challenges under different soil conditions, the engineering team will also set up two deep wells 3 meters on both sides of the exit axis and 5 meters away from the caisson for precipitation operations based on the actual situation on site and past experience. The depth of precipitation is required to exceed the elevation of the pipeline flow water surface by at least 3 meters to ensure the dryness of the construction area.

[0081] On the outside of the reserved tunnel door of the working shaft, a row of vertically closely spaced external sealing doors composed of 3# slotted steel sheet piles is set to further strengthen the sealing of the tunnel entrance. Before exiting the tunnel, a sealing device with two rubber water-stop rings will be installed on the inside of the reserved tunnel door. This can not only prevent the influx of water and soil outside the well when the door is pulled out of the tunnel, but also effectively prevent the loss of lubricating mud during the jacking process. At the same time, a limit device will be installed in the reserved hole circle to accurately control the axis position of the jacking pipe out of the hole. Once the sealing door is removed, the tunnel boring machine will continue to jack until the tunnel entrance and the water-stop device fully function to ensure the smooth progress of the entire jacking process;

[0082] In this embodiment, the performance requirements of the slurry for injection lubrication can be seen in the following table:

[0083] performance Basic Requirements density The mud density is maintained between 1.02 and 1.15, and the density is appropriately increased as the jacking depth increases; Colloid rate After the preparation, the colloid rate of the slurry is ≥98% (take 100ml and let it stand for 24 hours, the upper layer of water is ≤2ml) Thixotropy The apparent viscosity is lower at high shear and higher at low shear; Water loss API standard water loss ≤ 20ml (clay layer ≯ 12ml, sand layer ≯ 16ml) Apparent viscosity Apparent viscosity ≥30mPa·S (clay layer ≥45s, sand layer and pebble layer ≥50s) Funnel viscosity Soxhlet funnel viscosity greater than 30S Lubricity The lubricity of the mud is measured by the lubrication coefficient tested by the limit lubrication instrument: lubrication coefficient ≤ 0.25 Dynamic plastic ratio The larger the dynamic-plastic ratio, the stronger the shear thinning property of the mud, which should be kept between 0.36 and 0.48. pH Use soda ash and caustic soda to adjust the slurry pH value to between 9 and 11

[0084] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A large-caliber inorganic high-performance fiber composite pipe jacking construction process, characterized in that: The large-caliber inorganic high-performance fiber composite material jacking construction process comprises the following steps: The first step is to dig the foundation pit at the predetermined location, build the well wall and lay the concrete cushion layer, and then complete the preparation of the working well and the receiving well; The second step is to preset the outlet of the jacking group on the well wall in the working well, set the well wall opposite to the outlet of the jacking group as the pressure-bearing wall, and then install the rear seat back plate and the rear seat jack in sequence on the front side of the pressure-bearing wall, and install the hole water stop device at the outlet of the jacking group, so as to complete the preparation of the jacking equipment; Step 3: Install a top pipe (1) connected to the top pipe (1), a grouting device (2) and a grouting ring (5) arranged on the outer side of the top pipe (1) between the rear seat jack and the top pipe group outlet, wherein the grouting device (2) corresponds to the position of the grouting ring (5), and the grouting device (2) rotates around the top pipe (1); The fourth step is to use the pushing effect of the rear jack to push the tunnel boring machine and the jacking pipe group to the receiving well in sequence. During the pushing process, the mud in the slurry distributor (2) is input into the grouting ring (5), and the mud is sprayed out along the outer periphery of the jacking pipe (1) through the grouting ring (5). The mud lubricates the outer periphery of the jacking pipe (1) through the pressure between the jacking pipe (1) and the tunnel. After a section of the jacking pipe (1) close to the tunnel boring machine in the jacking pipe group is pushed into the receiving well, the construction of this part of the cable tunnel is completed.

2. A large-caliber inorganic high-performance fiber composite material jacking construction process according to claim 1, characterized in that: During the ejection process, the plurality of jacking pipes (1) respectively perform lubrication and drag reduction operations on the head of the tunnel boring machine by synchronously grouting and grouting along the line.

3. A large-diameter inorganic high-performance fiber composite material jacking construction process according to claim 2, characterized in that: The multiple jacking pipes (1) are used to synchronously grout the heads of the tunnel boring machines respectively, and the heads of the tunnel boring machines are synchronously grouted to form an original grout sleeve, filling the inherent gap between the heads of the tunnel boring machines and the pipe sections of the jacking pipes (1) as well as the correction gap generated by the correction.

4. A large-diameter inorganic high-performance fiber composite material jacking construction process according to claim 2, characterized in that: During the grouting process along the line, each section of the jacking pipe (1) connected section by section is grouted outward along its radial direction, and the missing grouting sleeve caused by the loss of water in the lubricating grout along the tunnel line is supplemented.

5. The large-diameter inorganic high-performance fiber composite material jacking construction process according to claim 1 is characterized by: The middle side of the top pipe (1) is provided with a grouting ring (5), the inner side of the top pipe (1) is provided with a slurry separator (2) and a plurality of multi-segment diversion pipes (4) in sequence, the slurry separator (2) rotates along the inner side of the top pipe (1), the plurality of multi-segment diversion pipes (4) are evenly distributed in a ring shape on the inner side of the slurry separator (2), the slurry in the slurry separator (2) is input into the grouting ring (5) by means of the diversion pipe (4), an input pipe (3) is provided on the outer side of the slurry separator (2), and the slurry separator (2) and the top pipe (1) are arranged at the same center of a circle; One end of the input pipe (3) is connected to the grouting pump, and the other end of the input pipe (3) is connected to the grouting distributor (2); a plurality of grouting holes (54) distributed in an annular pattern are arranged on the outer periphery of the grouting ring (5).

6. A large-diameter inorganic high-performance fiber composite material jacking construction process according to claim 5, characterized in that: A first inner groove (11) and a second inner groove (12) are symmetrically arranged on the inner wall of the top pipe (1); two ends of the grouting ring (5) extend inward to form positioning portions (51); a first insertion portion (52) and a second insertion portion (53) are respectively arranged on one side of the positioning portion (51) close to the top pipe (1); the first insertion portion (52) is plugged into the corresponding first inner groove (11), and the second insertion portion (53) is plugged into the corresponding second inner groove (12).

7. The large-diameter inorganic high-performance fiber composite material jacking construction process according to claim 1 is characterized by: The pulp separator (2) comprises a fixed seat (21), a rotating ring (22) and a plurality of blades (23); the outer periphery of the fixed seat (21) is connected to the inner periphery of the top pipe (1); the side surface of the fixed seat (21) is connected to the side surface of the rotating ring (22); the side surface of the rotating ring (22) is located on the inner periphery of the fixed seat (21) and is provided with a plurality of blades (23); all the multi-segment flow dividers (4) are arranged on the other side of the rotating ring (22); and all the multi-segment flow dividers (4) are evenly distributed with the center of the rotating ring (22) as the center; The plurality of multi-section flow dividing pipes (4) and the plurality of blades (23) are arranged alternately.

8. The large-diameter inorganic high-performance fiber composite material jacking construction process according to claim 7, characterized in that: The fixing seat (21) comprises an outer ring portion (211), an inner ring portion (212), a closed end (213) and a positioning ring (214); the inner ring portion (212) is arranged on the inner side of the outer ring portion (211); the inner ring portion (212) and the side of the outer ring portion (211) are connected via the closed end (213); one side of the outer ring portion (211), the inner ring portion (212) and the closed end (213) are open and the other side is closed; the positioning ring (214) is arranged on the inner wall of the outer ring portion (211) and is used to cooperate with the installation and positioning of the rotating ring (22).

9. A large-diameter inorganic high-performance fiber composite material jacking construction process according to claim 8, characterized in that: The rotating ring (22) is embedded between the outer ring portion (211) and the inner ring portion (212); a plurality of blades (23) are movably arranged between the outer ring portion (211) and the inner ring portion (212); and a side of the rotating ring (22) on which the blades (23) are mounted is in contact with a positioning ring (214); A plurality of independent cavities are formed between the blades (23) and the outer ring portion (211) and the inner ring portion (212), and the blades (23) stir the slurry in the plurality of independent cavities.

10. A large-diameter inorganic high-performance fiber composite pipe jacking construction process according to claim 9, characterized in that: The input pipe (3) is respectively connected to a plurality of independent cavities, and the input pipe (3) transports the slurry into the plurality of cavities.

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