Construction method for receiving rectangular jacking pipe in immersed pipe

Abstract

The invention discloses a construction method for receiving a rectangular jacking pipe in an immersed pipe. The construction method comprises the following steps that S1, immersed pipe joints are prefabricated; s2, reinforcing a foundation and excavating a foundation trench; s3, the immersed tube is immersed and locked; s4, mortar backfilling; s5, the end sealing door is dismantled underwater; s6, sand blasting and backfilling; s7, end reinforcement construction is conducted; s8, an anchor prevention layer is constructed; s9, the pipe jacking machine arrives; and S10, disassembling the pipe jacking machine in the hole. According to the construction method for receiving the rectangular jacking pipe in the immersed pipe, the pipe jacking machine receives the rectangular jacking pipe in the immersed pipe joint, channel rerouting, flood prevention and other delegation caused by water island building are avoided, meanwhile, the water foundation pit excavation risk and the jacking pipe receiving water leakage risk are avoided, construction is safer, the construction efficiency is improved, and the construction cost is reduced. The construction cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe jacking construction, and in particular relates to a construction method for receiving a rectangular pipe jacking in an immersed pipe. Background Art

[0002] Pipe jacking reception refers to the construction process from the trial reception of pipe jacking to the complete entry of the pipe jacking machine into the receiving well. Pipe jacking reception technology is one of the key technologies for pipe jacking construction and is also a sign of the success or failure of pipe jacking construction. Conventional receiving wells are arranged on land, and the enclosure structure is constructed and the main structure is constructed by open excavation. The receiving steel ring is embedded in the structure. After the pipe jacking machine is completely removed, the pipe jacking machine is lifted out by a crane, and then the secondary sealing is performed. For receiving rectangular pipes on water, it is often necessary to build a receiving well on the water, which is prone to flood control and channel diversion problems caused by excessive water resistance during the construction period. Summary of the invention

[0003] The object of the present invention is to provide a construction method for receiving a rectangular jacking pipe in an immersed tube, so as to solve the above-mentioned problems existing in the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: a construction method for receiving a rectangular jacking pipe in an immersed tube, comprising the following steps:

[0005] S1, prefabricate immersed tube segments and install receiving steel rings near the sealing doors at the ends of the immersed tubes;

[0006] S2, foundation reinforcement and foundation trench excavation: deep cement mixing piles are used to reinforce the foundation, and then the foundation trench is excavated;

[0007] S3, sinking and locking of immersed tubes: including sinking of tube segments, tube segment docking, stable ballasting of tube segments, through-line measurement of tube segments, removal of outfitting parts and pulling together;

[0008] S4, mortar backfill: backfill mortar in the range between the sealing door at the immersed tube end and the receiving steel ring to form a mortar backfill section;

[0009] S5, underwater removal of the end sealing door: cutting the end sealing door underwater and lifting the end sealing door out;

[0010] S6, sand blowing backfill: sand blowing backfill is carried out from the top line of the slope excavation to the end sealing door of the foundation trench, including using a transport ship to transport sand to the funnel through a conveyor belt, and then the sand is transferred to the foundation trench range through the funnel conduit to form a sand blowing backfill section;

[0011] S7, end reinforcement construction: use water triaxial mixing piles to reinforce the end;

[0012] S8, constructing an anti-anchor layer: Use barge transportation and grab dredger for backfilling to form an anti-anchor layer; during the construction process, frequently measure the ship position and water depth, control the amount of backfilling, and avoid overfilling;

[0013] S9, arrival of the pipe jacking machine: After the pipe jacking machine arrives at the designated stop position, the pipe sections within the pipe sinking range are first reinforced by consolidation grouting, and then the pipe jacking machine is separated from the equipment and the pipe sections by using the separation cylinder, and finally the well joint is molded;

[0014] S10, dismantling of the pipe jacking machine in the hole: using the pre-buried lifting rings of the immersed tube segments, electric hoists and manual cooperation to dismantle the machine. Before dismantling the machine, first remove the screw machine and lift it out of the starting well, then disassemble the front, middle, rear, upper and lower shells of the pipe jacking machine, and use a flatbed transport vehicle to transport the equipment to the ground.

[0015] As an optional implementation of the above technical solution, step S1 includes the following steps:

[0016] S11, dry dock construction: construct the dry dock enclosure structure, construct slope protection while excavating, and construct cushion layer at the bottom until the dry dock structure is completed;

[0017] S12, Fabrication and installation of steel bars for immersed tube segments: The steel bars for immersed tube segments are semi-finished in the processing plant and transported to the dry dock by a flatbed transporter. The bottom plate, wall and top plate steel bars are tied in sequence on site. The steel bars are mechanically connected. After the steel bars are tied, acceptance is carried out;

[0018] S13, installation of immersed tube segment formwork: the outer formwork is connected into a whole by bolts one by one, and a spatial truss reinforcement system consisting of vertical and horizontal trusses is adopted, and a tie rod truss is used on the top to pull left and right; the inner formwork includes the inner formwork main truss, formwork rack, formwork, hydraulic jacking system, hydraulic transverse movement system and longitudinal (or transverse) walking system. Hydraulic assembly and disassembly devices are set on both sides of the formwork, and screw rods are used for support and reinforcement. The inner formwork is supported on the front and rear legs through the main truss to transfer the load to the foundation;

[0019] S14, Concrete pouring of immersed tube segments: commercial concrete is used, and concrete pump trucks are used for transportation and distribution into the mold; when pouring the segment concrete, pour it evenly from top to bottom in layers, and the height of each layer shall not exceed 30cm, and the interval between pouring the upper and lower layers of concrete shall not exceed the initial setting time; use an extended inserted vibrator for vibration; the vibration should correspond to the concrete pouring layers, and vibrate in layers and zones; the vibration method is to insert quickly and lift slowly, and the vibration time is about 45s each time. The vibration points are arranged in a plum blossom shape with a spacing of about 0.3m, and are carried out in sequence without missing or lacking vibration;

[0020] S15, Concrete curing of immersed tube sections: the bottom plate and top plate shall be cured immediately after initial setting, and the geotextile shall be covered and water sprayed for moisture retention. The wall concrete shall also be immediately watered before the formwork is removed, and the geotextile shall be covered and water sprayed for moisture retention after the formwork is removed. The curing time shall not be less than 14 days.

[0021] S16, installation of immersed tube end sealing doors: the end sealing doors and connecting frames are processed and installed separately. The connecting frames and end sealing doors are processed as a whole in the factory, transported in sections, and assembled on site. Before pouring concrete at both ends of the pipe segment, the connecting frames are installed on the tire frame, and the initial slope is adjusted and connected to the pipe segment steel bars. After all the concrete of the pipe segment is poured and observed to be stable, the second precise slope adjustment is carried out, the end sealing doors are installed, and pressure grouting is carried out in the formed cavity.

[0022] As an optional implementation of the above technical solution, the length of the immersed tube segment is 17m, and the distance between the receiving steel ring and the immersed tube end sealing door is 6m.

[0023] As an optional implementation of the above technical solution, step S4 includes the following steps:

[0024] S41, roughening and cleaning inside the immersed tube: roughen the bottom plate, side wall and top plate within the range from the end sealing door to the receiving steel ring, with the roughening area not less than 75%, until the coarse material is chiseled and cleaned;

[0025] S42, formwork support: mortar backfill is poured twice and formwork support is also completed twice;

[0026] S43, mortar backfill: Use a concrete transport truck to transport the mortar to the working surface, and use a ground pump to transport the mortar to the backfill area for the first pouring. After the first pouring of mortar reaches the strength requirement, the top of the mortar is roughened and cleaned before the second mortar pouring.

[0027] As an optional implementation of the above technical solution, in step S42, the template adopts a combined steel template, and uses 20A steel as the back rib and the structural embedded sleeve as the pull rod.

[0028] As an optional implementation of the above technical solution, in step S43, during the top pouring, grouting is performed using a pre-buried pump pipe.

[0029] As an optional implementation of the above technical solution, step S5 includes the following steps:

[0030] S51, construction preparation: including the positioning of crane vessels, gas cutting equipment and divers;

[0031] S52, lifting point welding: the end sealing door is divided into four parts along the horizontal and vertical directions, and two lifting points are welded on each part;

[0032] S53, end sealing door cutting: The crane ship is in place, the end sealing door cutting hoist is installed, and the lifting rope is in a tensioned state; the cutting is carried out from top to bottom, one by one;

[0033] S54, underwater cutting technology: The diver carries the gas cutting equipment and dives down. The diver holds the cutting torch in one hand and the cutting strip in the other hand. The diver puts the cutting strip into the jaws of the cutting torch, tightens it, and then places the cutting strip on the cutting point. When cutting, the oxygen is turned on while the power is on, and the arc is struck for cutting.

[0034] As an optional implementation of the above technical solution, in step S52, the hanging point is made of round steel.

[0035] As an optional implementation of the above technical solution, step S7 includes the following steps:

[0036] S71, measurement and positioning: a person on board is sent to command the ship to move and anchor, and the anchor boat assists in anchoring. During the ship moving process, the anchoring personnel are commanded to control the four anchor machines to be retracted and released. Two GPS are arranged at both ends of the ship. The surveying personnel communicate closely with the anchoring personnel to reduce the ship moving time; before drilling, the ship surface or sea surface elevation is measured to determine the drilling depth;

[0037] S72, pile driver in place: move the mixing pile driver to the pile position, and align the drill bit with the center point of the pile position that has been released; after the pile driver is moved, check the positioning and correct it in time, and the deviation value is less than 5cm; and use a plumb bob to check the verticality of the pile driver, and the verticality is less than 1%;

[0038] S73, Shotcrete mixing and drilling: after the verticality and mud density are checked and meet the requirements, turn on the grouting pump, start the motor, and start the mixing and sinking shotcrete; the sinking speed and grouting flow rate are strictly controlled during the drilling process;

[0039] S74, the cement mixer is sunk to the designed depth, and stays at the bottom of the hole to mix and spray for 3 minutes, then it is lifted and sprayed and mixed repeatedly until the sludge surface;

[0040] S75, repeat step S74 once;

[0041] S76, Pile driver relocation: Clean the remaining cement slurry in all pipelines until they are basically clean, and clean the soft soil adhering to the mixing head, and move the pile driver to the next hole until all pile construction is completed.

[0042] As an optional implementation of the above technical solution, step S9 includes the following steps:

[0043] S91, receiving preparation: The distance between the pipe jacking machine and the receiving well tunnel door is regarded as the pipe jacking arrival receiving section. The surveying personnel are arranged to re-measure the posture of the pipe jacking machine, and the posture deviation is corrected in time according to the re-measurement results, so that the pipe jacking machine can exit the tunnel safely;

[0044] S92, slurry consolidation: After the first ring pipe segment is pushed to the designed pipe position, cement slurry is injected through the pre-buried grouting pipe to consolidate the thixotropic mud behind the pipe segment;

[0045] S93, pipe-machine separation: Use the pipe-jacking machine's own pipe-detaching cylinder to jack and detach the first ring of pipe segments. After the pipe-jacking machine detaches from the pipe segment, there is a long time before the concrete pouring of the tunnel gate ring, and there is a large gap between the tunnel gate steel ring and the pipe segment. After the pipe-jacking machine detaches, the gap between the tunnel gate steel ring and the pipe segment is immediately sealed with a steel plate;

[0046] S94, well joint construction: after the pipe jacking machine and the negative ring pipe section are removed, the well joint construction is carried out; before the construction of the portal ring at the starting well, the bearing opening steel sleeve ring is first cut off, and then the well joint steel bars are welded according to the design requirements, and the well joint concrete is constructed.

[0047] As an optional implementation of the above technical solution, step S10 includes the following steps:

[0048] S101, dismantling the screw machine: The screw machine is dismantled from inside the pipe jacking machine. First, use two electric hoists to tighten the screw machine, manually loosen the bolts between the screw machine and the end sealing door, loosen the electric hoist, and then move it backwards to place the screw machine on a flatbed truck, transport it to the starting well, and lift it out vertically;

[0049] S102, dismantling the cutterhead: Before dismantling, install an electric hoist on the pre-buried lifting ring of the immersed tube. To prevent the cutterhead from swaying left and right during dismantling, use two horizontal lifting rings to pull it closer and fix it. Dismantle it from top to bottom in sequence and use a flatbed truck to transport it to the ground through the immersed tube section tunnel;

[0050] S103, dismantling the upper front shield and the lower front shield: first dismantle the upper front shield, install electric hoists at the D, E, F, G, H and I positions of the embedded lifting rings of the immersed tube segment, remove the connecting bolts between the upper front shield and the lower front shield, separate the upper front shield from the lower front shield by pulling the electric hoist, and lift the upper front shield for a certain distance, install electric hoists at the A, B and C positions of the embedded lifting rings and pull them, and at the same time, loosen the electric hoists at the D, E, F, G, H and I positions accordingly to move the upper front shield forward until the upper front shield is completely moved out, and loosen all the electric hoists to place the upper front shield on a flatbed truck for transportation; after the upper front shield is dismantled, dismantle the lower front shield, use the electric hoists installed at the D, E, F, G, H and I positions to pull the electric hoists to slowly lift the lower front shield, and after the height requirement of the flatbed truck is met, loosen the electric hoists and place the lower front shield on the flatbed truck for transportation;

[0051] S104, dismantling of the upper middle shield and the lower middle shield: first dismantle the upper middle shield, install electric hoists at the G, H, I, J, K and L positions of the embedded lifting rings of the immersed tube segment, remove the connecting bolts between the upper middle shield and the lower middle shield, separate the upper middle shield from the lower middle shield by pulling the electric hoist, and lift the upper front shield for a distance, install electric hoists at the D, E and F positions of the embedded lifting rings and pull them, and at the same time, loosen the electric hoists at the G, H, I, J, K and L positions accordingly to move the upper middle shield forward until the upper middle shield is completely removed, and loosen all the electric hoists to place the upper middle shield on a flatbed truck for transportation; after the upper middle shield is dismantled, dismantle the lower middle shield, use the electric hoists installed at the G, H, I, J, K and L positions to pull the electric hoists to slowly lift the lower middle shield, and after the height requirement of the flatbed truck is met, loosen the electric hoists and place the lower middle shield on a flatbed truck for transportation;

[0052] S105, removal of the upper tail shield and the lower tail shield: first remove the upper tail shield, install electric hoists at the J, K and L positions of the embedded lifting rings of the immersed tube segment, remove the connecting bolts between the upper tail shield and the lower tail shield, separate the upper tail shield from the lower tail shield by pulling the electric hoist, and lift the upper tail shield for a distance, install electric hoists at the G, H and I positions of the embedded lifting rings and pull them, and at the same time loosen the electric hoists at the J, K and L positions to move the upper tail shield forward until the upper tail shield is completely removed, and loosen all the electric hoists to place the upper tail shield on a flatbed truck for transportation; after the upper tail shield is removed, remove the lower tail shield, use the electric hoists installed at the J, K and L positions to pull the electric hoists to slowly lift the lower tail shield. After the height requirement of the flatbed truck is met, loosen the electric hoists and place the lower tail shield on a flatbed truck for transportation.

[0053] The beneficial effects of the present invention are:

[0054] The present invention provides a construction method for receiving a rectangular jacking pipe in an immersed tube. The jacking machine receives the pipe in the immersed tube section, avoiding the commissions such as channel rerouting and flood control caused by building islands on water, and at the same time solving the risks of foundation pit excavation on water and water leakage in jacking pipe reception, making the construction safer, and being conducive to improving construction efficiency and reducing project costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a construction state diagram of receiving a rectangular jacking pipe in an immersed tube in one embodiment of the present invention;

[0056] Figure 2 is a schematic structural diagram of a pipe jacking machine in one embodiment of the present invention;

[0057] Figure 3 It is a structural schematic diagram of the plan layout of the lifting rings in one embodiment of the present invention.

[0058] In the figure: 1-sunk tube segment; 2-receiving steel ring; 3-lifting ring; 4-mortar backfill section; 5-sand blowing backfill section; 6-foundation trench; 7-end sealing door; 8-anti-anchor layer; 9-pipe jacking machine; 10-screw machine; 11-cutter head; 12-upper front shield; 13-upper middle shield; 14-upper tail shield; 15-lower front shield; 16-lower middle shield; 17-lower tail shield; 18-pipe release cylinder; 19-connecting bolts. DETAILED DESCRIPTION

[0059] like Figure 1-Figure 3 As shown, this embodiment provides a construction method for receiving a rectangular jacking pipe in an immersed tube, comprising the following steps:

[0060] S1, prefabrication of immersed tube segment 1: The immersed tube segment 1 is prefabricated in a dry dock. To meet the design linearity requirements and take into account the reception and removal needs of the jacking machine 9 in the immersed tube, the width and height of the immersed tube segment 1 are increased by 1.25m on each side, with a length of 17m. A receiving steel ring 2 is installed 6m away from the sealing door 7 at the end of the immersed tube.

[0061] Wherein, the above step S1 includes the following steps:

[0062] S11, dry dock construction: construct the dry dock enclosure structure, construct slope protection while excavating, and construct cushion layer at the bottom until the dry dock structure is completed;

[0063] S12, Fabrication and installation of steel bars for immersed tube segment 1: The steel bars for immersed tube segment 1 are semi-finished in the processing plant and transported to the dry dock by a flatbed transporter. The bottom plate, wall and top plate steel bars are tied in sequence on site. The steel bars are connected mechanically. After the steel bars are tied and accepted, concrete is poured;

[0064] S13, installation of immersed tube section 1 template: the outer template is connected into a whole piece by piece with bolts; a spatial truss reinforcement system consisting of vertical and horizontal trusses is adopted, and there are tie rod trusses on the top to pull left and right. The inner template consists of the inner template main truss, template rack, template, hydraulic jacking system, hydraulic transverse movement system and longitudinal (or transverse) walking system, with a total length of 19.5 meters. Hydraulic assembly and disassembly devices are set on both sides of the template, and screw rods are supported and reinforced. The inner template is supported on the front and rear legs through the main truss to transfer the load to the foundation.

[0065] S14, Concrete pouring of immersed tube segment 1: Commercial concrete is used, and a 52-meter concrete delivery pump truck is used for delivery and placement of concrete into the mold. When pouring the segment concrete, pour it evenly from top to bottom in layers, and the height of each layer shall not exceed 30cm. The interval between pouring the upper and lower layers of concrete shall not exceed the initial setting time. Use an extended inserted vibrator to vibrate; the vibration should correspond to the concrete pouring layer, and vibrate in layers and zones; the vibration method is to insert quickly and lift slowly, and the vibration time is about 45s each time. The vibration points are arranged in a plum blossom shape with a spacing of about 0.3m. They are carried out in sequence and no vibration is missed or lacked.

[0066] S15, Concrete curing of immersed tube section 1: The bottom plate and top plate should be cured immediately after initial setting, and covered with geotextile and sprayed with water for moisture retention. The wall concrete should also be immediately watered and cured if the formwork is not removed. After the formwork is removed, the geotextile should be covered and sprayed with water for moisture retention. The curing time should be no less than 14 days.

[0067] S16, installation of the end sealing door 7 of the immersed tube: the end sealing door 7 and the connecting frame are processed and installed separately, and the connecting frame (including the anchoring steel bars) and the end sealing door 7 are processed as a whole in the factory, transported in sections, and assembled on site; before pouring the concrete of the pouring sections at both ends of the pipe segment, the connecting frame is installed on the tire frame, the initial slope is adjusted and the steel bars of the pipe segment are connected; after all the concrete of the pipe segment is poured and observed to be stable, the second precise slope adjustment is carried out, the end sealing door 7 is installed, and pressure grouting is carried out in the formed cavity.

[0068] S2, foundation reinforcement, foundation trench 6 excavation: Deep cement mixing piles (DCM) are used for foundation reinforcement to treat the foundation, and a grab dredger is used with several mud barges to organize the "digging, transportation, and dumping" construction. The grab dredger dredges mud to the mud barge, and after the mud barge is full, the mud is transported to the designated mud dumping area for dumping.

[0069] S3, sinking and locking of immersed tube: after being towed and floated to the tunnel site by a tugboat fleet and moored, it mainly includes the processes of sinking the pipe segments, connecting the pipe segments, stabilizing the ballasting of the pipe segments, measuring the through-axis of the pipe segments, removing the outfitting parts, and pulling them together.

[0070] S4, mortar backfilling: After the immersed tube is sunk and locked, mortar backfill is performed in the range from the sealing door 7 at the end of the immersed tube section to the receiving steel ring 2. M5 mortar is pumped for backfilling to form a mortar backfill section 4.

[0071] Wherein, the above step S4 includes the following steps:

[0072] S41, roughening and cleaning inside the immersed tube: roughen the bottom plate, side wall and top plate within the range from the end sealing door 7 to the receiving steel ring 2, with the roughening area not less than 75%, until the coarse material is chiseled and cleaned;

[0073] S42, formwork support: mortar backfill is poured in two times, and the formwork support is also supported in two times; the formwork adopts a combined steel formwork, and uses 20A steel as the back rib + structural embedded sleeve as the tie rod;

[0074] S43, mortar backfill: Use a concrete transport truck to transport the mortar to the working surface, and use a ground pump to transport the mortar to the backfill area. The first pouring height is 3.6m. After the first pouring of mortar reaches the strength requirement, the top of the mortar is roughened and cleaned before the second mortar pouring. To ensure that the mortar is poured full, use the pre-buried pump pipe to grout when pouring on the top.

[0075] S5, underwater removal of the end sealing door 7: the end sealing door 7 is cut by underwater gas cutting by divers, and then lifted out vertically by a crane ship.

[0076] Wherein, the above step S5 includes the following steps:

[0077] S51, construction preparation: 100t crane ship, gas cutting equipment, and divers are in place;

[0078] S52, lifting point welding: the end sealing door 7 is divided into 4 parts in the horizontal and vertical directions. Considering the balance of underwater lifting, 2 lifting points are welded on each part. The lifting points are made of Φ32 round steel;

[0079] S53, cutting off the end sealing door 7: the 100t crane ship is in place, and the end sealing door 7 cutting hoist is installed, and the hoisting rope must not be in a loose state. The cutting is carried out from top to bottom, one by one;

[0080] S54, underwater cutting technology: The cutting diver dives with a cutting torch, holding the cutting torch in one hand and the cutting strip in the other, inserts the cutting strip into the jaws of the cutting torch, tightens it, and then places the cutting strip on the cutting point. When cutting, in order to prevent the inner hole of the cutting strip from being blocked, oxygen must be turned on while the power is turned on, and the arc must be struck for cutting.

[0081] S6, sand blowing backfill: The scope of sand blowing backfill is mainly from the top line of the slope excavation of the foundation trench 6 to the end sealing door 7. A special chute ship + belt transport ship are used for backfilling. That is, the belt transport ship transports the sand to the funnel through the conveyor belt, and the sand is then transferred to the scope of the foundation trench 6 through the funnel conduit, forming a sand blowing backfill section 5.

[0082] S7, end reinforcement construction: The end reinforcement adopts water three-axis mixing pile reinforcement, 2 mixing 2 spraying construction process;

[0083] Wherein, the above step S7 includes the following steps:

[0084] S71, measurement and positioning: a special person is assigned to the ship to command the ship moving and anchoring positioning, and the anchor boat assists in anchoring. During the ship moving process, the person in charge of anchoring controls the four anchor machines to be retracted and released. Two GPSs are arranged at both ends of the ship. The surveying personnel communicate closely with the person in charge of anchoring to reduce the time of ship moving. Before drilling, measure the elevation of the ship surface or sea surface to determine the drilling depth;

[0085] S72, pile driver in place: move the pile driver to the pile position, and align the drill bit with the center point of the pile position. After the pile driver is moved, carefully check the positioning and correct it in time. The deviation value should be less than 5cm. Use a plumb bob to check the verticality of the pile driver. The verticality should be less than 1%;

[0086] S73, Shotcrete mixing and drilling: After the verticality and mud density are checked to meet the requirements, turn on the grouting pump, start the motor, and start mixing and sinking grouting. The sinking speed and grouting flow rate are strictly controlled during the drilling process;

[0087] S74, the cement mixer is sunk to the designed depth, and stays at the bottom of the hole to mix and spray for 3 minutes, then it is lifted and sprayed and mixed repeatedly until the sludge surface;

[0088] S75, repeat step S74 once;

[0089] S76, Pile driver relocation: Clean the remaining cement slurry in all pipelines until they are basically clean, and clean the soft soil adhering to the mixing head, and move the pile driver to the next hole until all pile construction is completed.

[0090] S8, construction of anti-anchor layer 8: Use barge transportation and grab dredger for backfilling construction. During the construction process, frequently measure the ship position and water depth, strictly control the amount of backfilling, and avoid overfilling as much as possible.

[0091] S9, arrival of pipe jacking machine 9: After pipe jacking machine 9 arrives at the designated stop position, the pipe sections within the pipe sinking range are firstly reinforced by consolidation grouting, and then the pipe jacking machine 9 is separated from the oil cylinder to separate the equipment from the pipe section, and finally the well joint is molded.

[0092] Wherein, the above step S9 includes the following steps:

[0093] S91, receiving preparation: the pipe jacking machine 9 is 10 rings (15m) away from the receiving well hole door as the pipe jacking arrival receiving section, and the surveying personnel are arranged to re-measure the posture of the pipe jacking machine 9, and the posture is corrected in time according to the re-measurement results to ensure that the pipe jacking machine 9 can be safely out of the hole;

[0094] S92, slurry consolidation: After the first ring pipe segment is pushed to the designed pipe position, cement slurry is injected through the pre-buried grouting pipe to consolidate the thixotropic mud behind the pipe segment;

[0095] S93, pipe-machine separation: use the self-contained pipe-disconnecting cylinder 18 of the pipe-jacking machine 9 to push and disconnect the first ring pipe segment. After the pipe-jacking machine 9 is disconnected from the pipe segment, there is a long time before the concrete pouring of the tunnel gate ring, and the gap between the tunnel gate steel ring and the pipe segment is large. After the pipe-jacking machine 9 is disconnected, the gap between the tunnel gate steel ring and the pipe segment is immediately blocked with a steel plate;

[0096] S94, well joint construction: after the pipe jacking machine 9 and the negative ring pipe section are removed, the well joint construction is carried out. Before the construction of the tunnel ring at the starting well, the bearing opening steel sleeve ring must be cut off first, and then the well joint steel bars are welded according to the design requirements, and the well joint concrete is constructed.

[0097] S10, dismantling of the pipe jacking machine 9 in the hole: dismantling is carried out by using the pre-buried lifting ring 3 of the immersed pipe segment 1 + electric hoist + manual cooperation. Before dismantling, the screw machine 10 is first dismantled and lifted out from the starting well, and then the front, middle, rear and upper and lower shells of the pipe jacking machine 9 are disassembled, and the equipment is transported to the ground by a flatbed transport vehicle.

[0098] Wherein, the above step S10 includes the following steps:

[0099] S101, dismantling the screw machine 10: The screw machine 10 is dismantled from the pipe jacking machine 9. First, two electric hoists are used to tighten the screw machine 10, and the bolts between the screw machine 10 and the end sealing door 7 are manually loosened. By loosening the electric hoist, the screw machine 10 is placed on a flatbed truck by moving it backward, transported to the starting well, and lifted out vertically;

[0100] S102, dismantling the cutter head 11: before dismantling, first install an electric hoist on the pre-buried lifting ring 3 of the immersed tube. To prevent the cutter head 11 from swaying left and right during dismantling, use two horizontal lifting rings 3 to pull it closer and fix it. The dismantling order is from top to bottom, and the cutter head 11 is transported to the ground through the immersed tube tunnel using a flatbed truck;

[0101] S103, dismantle the upper front shield 12 and the lower front shield 15: first dismantle the upper front shield 12, install electric hoists at the D, E, F, G, H and I positions of the embedded lifting ring 3 of the immersed tube segment 1, remove the connecting bolts 19 between the upper front shield 12 and the lower front shield 15, separate the upper front shield 12 and the lower front shield 15 by pulling the electric hoist, and lift the upper front shield 12 by 1m, install electric hoists at the A, B and C positions of the embedded lifting ring 3 and pull them, and loosen the D, E, F Use the electric hoists installed at positions D, E, F, G, H and I to move the upper front shield 12 forward until the upper front shield 12 is completely removed, and loosen all the electric hoists to place the upper front shield 12 on a flatbed truck for transportation; after the upper front shield 12 is removed, remove the lower front shield 15, use the electric hoists installed at positions D, E, F, G, H and I to pull the electric hoists to slowly lift the lower front shield 15, and after the height requirement of the flatbed truck is met, loosen the electric hoists and place the lower front shield 15 on a flatbed truck for transportation;

[0102] S104, dismantle the upper middle shield 13 and the lower middle shield 16: first dismantle the upper middle shield 13, install electric hoists at the G, H, I, J, K and L positions of the embedded lifting ring 3 of the immersed tube segment 1, remove the connecting bolts 19 between the upper middle shield 13 and the lower middle shield 16, separate the upper middle shield 13 and the lower middle shield 16 by pulling the electric hoist, and lift the upper front shield 12 by 1m, install electric hoists at the D, E and F positions of the embedded lifting ring 3 and pull them, and loosen the corresponding G, H, I Use the electric hoists installed at the positions of G, H, I, J, K and L to move the upper middle shield 13 forward until the upper middle shield 13 is completely removed, and loosen all the electric hoists to place the upper middle shield 13 on a flatbed truck for transportation; after the upper middle shield 13 is removed, remove the lower middle shield 16, use the electric hoists installed at the positions of G, H, I, J, K and L to pull the electric hoists to slowly lift the lower middle shield 16, and after the height requirement of the flatbed truck is met, loosen the electric hoists and place the lower middle shield 16 on a flatbed truck for transportation;

[0103] S105, dismantling the upper tail shield 14 and the lower tail shield 17: first dismantle the upper tail shield 14, install electric hoists at the J, K and L positions of the embedded lifting ring 3 of the immersed tube segment 1, remove the connecting bolts 19 between the upper tail shield 14 and the lower tail shield 17, separate the upper tail shield 14 and the lower tail shield 17 by pulling the electric hoist, and lift the upper tail shield 14 by 1m, install electric hoists at the G, H and I positions of the embedded lifting ring 3 and pull them, and at the same time, loosen the electric hoists at the J, K and L positions accordingly to move the upper tail shield 14 forward until the upper tail shield 14 is completely moved out, and loosen all the electric hoists to place the upper tail shield 14 on a flatbed truck for transportation; after the upper tail shield 14 is dismantled, dismantle the lower tail shield 17, use the electric hoists installed at the J, K and L positions to pull the electric hoists to slowly lift the lower tail shield 17, and after the height requirement of the flatbed truck is met, loosen the electric hoists and place the lower tail shield 17 on the flatbed truck for transportation.

[0104] The present invention provides a construction method for receiving a rectangular jacking pipe in an immersed tube. The jacking machine 9 receives the pipe in the immersed tube section 1, avoiding the commissions such as channel rerouting and flood control caused by building islands on the water, and at the same time solving the risks of foundation pit excavation on the water and water leakage in jacking pipe reception, making the construction safer, and being conducive to improving construction efficiency and reducing project costs.

[0105] In the description of the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. Under the condition that there is no contradiction, those skilled in the art may combine the features of different embodiments. The protection scope of the present invention is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present invention, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention.

Claims

1. A construction method for receiving a rectangular jacking pipe in an immersed tube, characterized in that: The following steps are involved: S1, prefabricate the immersed tube segment (1), and install a receiving steel ring (2) near the sealing door (7) at the end of the immersed tube; S2, foundation reinforcement and excavation of foundation trench (6): using deep cement mixing piles to reinforce the foundation, and then excavating the foundation trench (6); S3, sinking and locking of immersed tubes: including sinking of tube segments, tube segment docking, stable ballasting of tube segments, through-line measurement of tube segments, removal of outfitting parts and pulling together; S4, mortar backfilling: backfilling mortar in the range between the sealing door (7) at the end of the immersed tube and the receiving steel ring (2) to form a mortar backfilling section (4); S5, underwater removal of the end sealing door (7): cutting the end sealing door (7) underwater and lifting the end sealing door (7) out; S6, sand blowing backfill: sand blowing backfill is performed from the top line of the slope excavation of the foundation trench (6) to the end sealing door (7), including using a transport ship to transport sand to a funnel through a conveyor belt, and the sand is then transferred to the range of the foundation trench (6) through the funnel guide tube, forming a sand blowing backfill section (5); S7, end reinforcement construction: use water triaxial mixing piles to reinforce the end; S8, constructing an anti-anchor layer (8): using barge transportation and grab dredger for backfilling to form an anti-anchor layer (8); during the construction process, frequently measure the ship position and water depth, control the amount of backfilling, and avoid overfilling; S9, arrival of the pipe jacking machine (9): after the pipe jacking machine (9) arrives at the designated stop position, the pipe jacking section within the pipe sinking range is firstly reinforced by consolidation grouting, and then the pipe jacking machine (9) is separated from the oil cylinder to separate the equipment from the pipe jacking section, and finally the well joint is molded; S10, dismantling the pipe jacking machine (9) in the hole: dismantling the machine is performed by using the pre-buried lifting ring (3) of the immersed pipe section (1), an electric hoist and manual cooperation. Before dismantling the machine, the screw machine (10) is first dismantled and then lifted out from the starting well, and then the pipe jacking machine (9) is disassembled and the equipment is transported to the ground using a flatbed transport vehicle.

2. The construction method for receiving a rectangular jacking pipe in an immersed tube according to claim 1, characterized in that: The step S1 comprises the following steps: S11, dry dock construction: construct the dry dock enclosure structure, construct slope protection while excavating, and construct cushion layer at the bottom until the dry dock structure is completed; S12, manufacturing and installation of steel bars for immersed tube segments (1): The steel bars for immersed tube segments (1) are manufactured as semi-finished products in a processing plant, and transported to a dry dock by a flatbed transport vehicle. The bottom plate, wall and top plate steel bars are tied in sequence on site. The steel bars are connected mechanically. After the steel bars are tied, acceptance is carried out; S13, immersed tube segment (1) formwork installation: The outer formwork is connected into a whole piece by bolts, and a spatial truss reinforcement system consisting of vertical and horizontal trusses is adopted. The top has a tie rod truss for left and right pulling. The inner formwork includes an inner formwork main truss, a formwork rack, a formwork, a hydraulic jacking system, a hydraulic transverse movement system and a walking system. Hydraulic assembly and disassembly devices are set on both sides of the formwork, and screw rods are used for support and reinforcement. The inner formwork is supported on the front and rear legs through the main truss to transfer the load to the foundation. S14, Concrete pouring of immersed tube segments (1): Commercial concrete is used, and concrete pump trucks are used to transport and place the concrete into the mold. When pouring the segment concrete, the concrete is poured evenly in layers from top to bottom. The height of each layer shall not exceed 30 cm, and the interval between pouring the upper and lower layers of concrete shall not exceed the initial setting time. An extended inserted vibrator is used for vibrating. The vibration is carried out in layers and zones in accordance with the concrete pouring layers. The vibration method is to insert the concrete quickly and lift it slowly. The vibration time is 45 seconds each time. The vibration points are arranged in a plum blossom shape with a spacing of 0.3 m, and are carried out in sequence. S15, Concrete curing of immersed tube sections (1): The bottom plate and top plate shall be cured immediately after initial setting, and the curing shall be carried out by covering with geotextile and spraying with water for moisture retention. The wall concrete shall also be immediately sprayed with water for curing before the formwork is removed. After the formwork is removed, the geotextile shall be covered and sprayed with water for moisture retention. The curing time shall not be less than 14 days. S16, installation of the end sealing door (7) of the immersed tube: the end sealing door (7) and the connection frame are processed and installed separately. The connection frame and the end sealing door (7) are processed as a whole in the factory, transported in sections, and assembled on site. Before pouring the concrete of the pouring sections at both ends of the pipe segment, the connection frame is installed on the tire frame, the initial slope is adjusted and connected to the pipe segment steel bars. After the concrete of the pipe segment is poured and observed to be stable, the second precise slope adjustment is carried out, the end sealing door (7) is installed, and pressure grouting is carried out in the formed cavity.

3. The construction method for receiving a rectangular jacking pipe in an immersed tube according to claim 1, characterized in that: The length of the immersed tube segment (1) is 17 m, and the distance between the receiving steel ring (2) and the immersed tube end sealing door (7) is 6 m.

4. The construction method for receiving a rectangular jacking pipe in an immersed tube according to claim 1, characterized in that: The step S4 comprises the following steps: S41, roughening and cleaning the inside of the immersed tube: roughen the bottom plate, side wall and top plate within the range from the end sealing door (7) to the receiving steel ring (2), with the roughening area not less than 75%, until the rough material is removed and cleaned; S42, formwork support: mortar backfill is poured twice and formwork support is also completed twice; S43, mortar backfill: Use a concrete transport truck to transport the mortar to the working surface, and use a ground pump to transport the mortar to the backfill area for the first pouring. After the first pouring of mortar reaches the strength requirement, the top of the mortar is roughened and cleaned before the second mortar pouring.

5. The construction method for receiving a rectangular jacking pipe in an immersed tube according to claim 4, characterized in that: In step S42, the template uses a combined steel template, and uses 20A steel as the back rib and the structural embedded sleeve as the tie rod; in step S43, when pouring the top, the embedded pump pipe is used for grouting.

6. The construction method for receiving a rectangular jacking pipe in an immersed tube according to claim 1, characterized in that: The step S5 comprises the following steps: S51, construction preparation: including the positioning of crane vessels, gas cutting equipment and divers; S52, welding of hanging points: the end sealing door (7) is divided into four parts along the horizontal and vertical directions, and two hanging points are welded on each part; S53, cutting off the end sealing door (7): the crane ship is in place, the end sealing door (7) cutting sling is installed, and the lifting rope is in a tensioned state; the cutting is carried out from top to bottom, one by one; S54, underwater cutting technology: The diver carries the gas cutting equipment and dives down. The diver holds the cutting torch in one hand and the cutting strip in the other hand. The diver puts the cutting strip into the jaws of the cutting torch, tightens it, and then places the cutting strip on the cutting point. When cutting, the oxygen is turned on while the power is on, and the arc is struck for cutting.

7. The construction method for receiving a rectangular jacking pipe in an immersed tube according to claim 6, characterized in that: In step S52, the hanging point is made of round steel.

8. The construction method for receiving a rectangular jacking pipe in an immersed tube according to claim 1, characterized in that: The step S7 comprises the following steps: S71, measurement and positioning: a person on board is sent to command the ship to move and anchor, and the anchor boat assists in anchoring. During the ship moving process, the anchoring personnel are commanded to control the four anchor machines to be retracted and released. Two GPS are arranged at both ends of the ship. The surveying personnel communicate closely with the anchoring personnel to reduce the ship moving time; before drilling, the ship surface or sea surface elevation is measured to determine the drilling depth; S72, pile driver in place: move the mixing pile driver to the pile position, and align the drill bit with the center point of the pile position that has been released; after the pile driver is moved, check the positioning and correct it in time, and the deviation value is less than 5cm; and use a plumb bob to check the verticality of the pile driver, and the verticality is less than 1%; S73, Shotcrete mixing and drilling: after the verticality and mud density are checked and meet the requirements, turn on the grouting pump, start the motor, and start the mixing and sinking shotcrete; the sinking speed and grouting flow rate are strictly controlled during the drilling process; S74, the cement mixer is sunk to the designed depth, and stays at the bottom of the hole to mix and spray for 3 minutes, then it is lifted and sprayed and mixed repeatedly until the sludge surface; S75, repeat step S74 once; S76, pile driver relocation: clean the remaining cement slurry in all pipelines, clean the soft soil adhering to the mixing head, and move the pile driver to the next hole position until all pile construction is completed.

9. The construction method for receiving a rectangular jacking pipe in an immersed tube according to claim 1, characterized in that: The step S9 comprises the following steps: S91, receiving preparation: the distance between the pipe jacking machine (9) and the receiving well hole door is used as the pipe jacking arrival receiving section, and the surveying personnel are arranged to re-measure the posture of the pipe jacking machine (9), and the posture deviation is corrected in time according to the re-measurement result, so that the pipe jacking machine (9) can be safely out of the hole; S92, slurry consolidation: After the first ring pipe segment is pushed to the designed pipe position, cement slurry is injected through the pre-buried grouting pipe to consolidate the thixotropic mud behind the pipe segment; S93, pipe-machine separation: using the pipe-release cylinder (18) of the pipe-jacking machine (9) to push and release the first ring pipe segment. After the pipe-jacking machine (9) is released from the pipe segment, there is a long time before the concrete pouring of the tunnel gate ring, and the gap between the tunnel gate steel ring and the pipe segment is large. After the pipe-jacking machine (9) is released, the gap between the tunnel gate steel ring and the pipe segment is immediately sealed with a steel plate; S94, well joint construction: after the pipe jacking machine (9) and the negative ring pipe section are removed, the well joint construction is carried out; before the construction of the tunnel ring at the starting well, the bearing opening steel sleeve ring is first cut off, and then the well joint steel bars are welded according to the design requirements, and the well joint concrete is constructed.

10. The construction method for receiving a rectangular jacking pipe in an immersed tube according to claim 9, characterized in that: The step S10 comprises the following steps: S101, dismantling the screw machine (10): The screw machine (10) is dismantled from the pipe jacking machine (9). First, the screw machine (10) is tightened with two electric hoists, and the bolts between the screw machine (10) and the end sealing door (7) are manually loosened. By loosening the electric hoists, the screw machine (10) is placed on a flatbed truck by moving it backward, transported to the starting well, and lifted out vertically; S102, dismantling the cutterhead (11): before dismantling, first install an electric hoist on the pre-buried lifting ring (3) of the immersed tube. To prevent the cutterhead (11) from swaying left and right during dismantling, use two horizontal lifting rings (3) to pull it closer and fix it. The dismantling sequence is from top to bottom, and the cutterhead is transported to the ground through the immersed tube section tunnel using a flatbed truck. S103, dismantling the upper front shield (12) and the lower front shield (15): first dismantle the upper front shield (12), install electric hoists at the D, E, F, G, H and I positions of the embedded lifting ring (3) of the immersed tube segment (1), remove the connecting bolts (19) between the upper front shield (12) and the lower front shield (15), separate the upper front shield (12) and the lower front shield (15) by pulling the electric hoist, and lift the upper front shield (12) by 1m. Install electric hoists at the A, B and C positions of the embedded lifting ring (3) and pull them, and loosen the corresponding The electric hoists at the positions D, E, F, G, H and I move the upper front shield (12) forward until the upper front shield (12) is completely removed, and all the electric hoists are loosened to place the upper front shield (12) on a flatbed truck for transportation; after the upper front shield (12) is removed, the lower front shield (15) is removed, and the electric hoists installed at the positions D, E, F, G, H and I are used to pull the electric hoists to slowly lift the lower front shield (15). After the height requirement of the flatbed truck is met, the electric hoists are loosened to place the lower front shield (15) on a flatbed truck for transportation; S104, dismantling the upper middle shield (13) and the lower middle shield (16): first dismantle the upper middle shield (13), install electric hoists at the G, H, I, J, K and L positions of the embedded lifting ring (3) of the immersed tube segment (1), remove the connecting bolts (19) between the upper middle shield (13) and the lower middle shield (16), separate the upper middle shield (13) and the lower middle shield (16) by pulling the electric hoist, and lift the upper front shield (12) for a certain distance, install electric hoists at the D, E and F positions of the embedded lifting ring (3) and pull them, and at the same time loosen the corresponding The electric hoists at positions G, H, I, J, K and L are driven to move the upper middle shield (13) forward until the upper middle shield (13) is completely removed, and all the electric hoists are loosened to place the upper middle shield (13) on a flatbed truck for transportation; after the upper middle shield (13) is removed, the lower middle shield (16) is removed, and the electric hoists installed at positions G, H, I, J, K and L are used to pull the electric hoists to slowly lift the lower middle shield (16), and after the height requirement of the flatbed truck is met, the electric hoists are loosened to place the lower middle shield (16) on a flatbed truck for transportation; S105, dismantling the upper tail shield (14) and the lower tail shield (17): first dismantle the upper tail shield (14), install electric hoists at the J, K and L positions of the embedded lifting ring (3) of the immersed tube segment (1), remove the connecting bolts (19) between the upper tail shield (14) and the lower tail shield (17), separate the upper tail shield (14) and the lower tail shield (17) by pulling the electric hoist, and lift the upper tail shield (14) for a certain distance, install electric hoists at the G, H and I positions of the embedded lifting ring (3) and pull them, and at the same time The electric hoists at the positions J, K and L are correspondingly loosened to move the upper tail shield (14) forward until the upper tail shield (14) is completely removed, and all the electric hoists are loosened to place the upper tail shield (14) on a flatbed truck for transportation; after the upper tail shield (14) is removed, the lower tail shield (17) is removed, and the electric hoists installed at the positions J, K and L are used to pull the electric hoists to slowly lift the lower tail shield (17). After the height requirement of the flatbed truck is met, the electric hoists are loosened to place the lower tail shield (17) on a flatbed truck for transportation.

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