Construction method for overall translation of pipe jacking machine under space restriction

Abstract

The application discloses a construction method for overall translation of a pipe jacking machine under space limitation, which comprises the following steps: laying a bottom plate of a pipe jacking working well, pre-burying a steel plate after binding the steel bars of the bottom plate, pre-burying a straight thread adapter of a middle partition wall on the bottom plate, and making the top elevation of the straight thread adapter flush with the top elevation of the bottom plate; laying a middle plate of the pipe jacking working well, and pre-burying the straight thread adapter of the middle partition wall; laying a top plate, and additionally arranging a circle of reinforced concrete retaining wall around the hoisting hole of the top plate; temporarily fixing a starting base at a position to be translated, welding and fixing a steel support counterforce frame on an overall steel plate, uniformly smearing butter on a translation path, and adjusting the pipe jacking machine; translating the pipe jacking machine and the starting base as a whole by means of the counterforce provided by the steel support; fixing a starting guide rail, debugging the pipe jacking machine, and making the pipe jacking machine jacking; and restoring the middle partition wall and the hoisting hole of the pipe jacking working well. The method can prevent the top steel bars from scratching the pipe shell during the translation process, and ensures the flatness of the overall steel plate at the lower end.

Description

Technical Field

[0001] This invention belongs to the field of pipe jacking construction technology, specifically relating to a construction method for the overall translation of a pipe jacking machine under space constraints. Background Technology

[0002] In recent years, China's urbanization has been accelerating, and subways are an important indicator of urbanization. In the current subway construction, the above-ground pipelines are intricate and intertwined. Therefore, underground cables and drainage pipelines are usually laid. At present, China's pipe jacking construction technology is mature. However, during construction, the "urban spider web" problem caused by the large number, disorder and mess of conventional pipelines means that the pipelines are often buried after the pipe jacking construction is completed. The pipelines directly above the working shaft affect the hoisting of the pipe jacking machine.

[0003] For example, Chinese invention patent application number 201910182761.6 discloses a method for jacking construction of steel cylinder concrete pipes, including the following steps:

[0004] Step 1, Pipeline Assembly Preparation: Clean and lubricate the spigot and socket. Open a pressure test hole and a vent hole at the second spigot of the pipeline, spaced 180° apart on the circumferential plane of the pipeline. Open a first groove and a second groove on both sides of the circumferential plane containing the pressure test hole and the vent hole. Place the first and second O-ring seals in the first and second grooves respectively. Use a smooth wooden or iron rod to lining the space between the seals and the surface of the second spigot. Then slide the rod along the circumferential direction of the spigot ring for two full rotations, ensuring the seals are evenly and tightly fitted into the grooves of the spigot ring. Open a third groove at the first spigot of the pipeline and place a wedge-shaped seal in the third groove.

[0005] Step 2, Pipe splicing: Hoist the pipe onto the track, remove the vent bolts, and start the rear seat cylinder to gradually advance the rear pipe until the joint is properly fitted.

[0006] Step 3, Interface Sealing Test: Connect the test pump to the test hole of the socket ring and test the interface sealing performance. Gradually increase the pressure on the test pump to 1.5 times the working pressure and maintain constant pressure for at least 3 minutes. If there is no significant pressure drop and no water leakage at the pipe interface, the pressure test is qualified. After the pressure test is completed, tighten the sealing bolt of the test hole. If the pressure test is unqualified, pull out this pipe section, reinstall the first O-ring seal and the second O-ring seal, and then repeat steps 2 to 3 until the pressure test is qualified.

[0007] Step 4, Pipe jacking: Pipe jacking is carried out using a slurry-balanced pipe jacking machine, and grouting equipment is connected. By using friction-reducing agents and expanding the diameter of the machine head, the resistance of pipe jacking is reduced to ensure that the amount of slurry discharged and the jacking speed are matched, and the downtime is controlled to not exceed 12 hours.

[0008] Step 5, Secondary Joint Sealing Test: After the pipeline is jacked up, a second sealing test is conducted on the joint according to the construction method in Step 3.

[0009] Step Six, Joint Treatment: Inject cement grout into the outside of the pipe body through the grouting hole to displace the drag-reducing mud. Then, seal the grouting hole and test its sealing performance. Fill the gaps at the pipe joint with caulking sealant. Seal the test hole and vent hole with bolts. For joints that fail in Step Five, apply instant cement for secondary treatment on the outside of the caulking sealant and the outside of the sealing bolts of the test hole and vent hole. Finally, seal the pipeline with a steel-supported baffle and conduct a formal water pressure test.

[0010] Step 7, Preparation and arrangement for pressure testing of working well and receiving well: Seal both ends of the pipeline. During the pressure test preparation, ensure that the pipeline is immersed in pressureless water for more than 48 hours, and then immerse it in pressure for 24 hours to remove the air from the pipeline.

[0011] Step 8, whole pipe water pressure test: The sealing performance of the pipeline is tested by injecting water and pressurizing it.

[0012] The existing technology has the following technical problems in actual construction: the pipe jacking machine is easily scratched when it moves horizontally; under construction conditions where space is limited or the high-voltage line above the working shaft is restricted and vertical hoisting is not possible, the pipeline affects the hoisting of the pipe jacking machine.

[0013] In view of the above-mentioned technical problems existing in the prior art, the present invention provides a construction method for the overall translation of a pipe jacking machine under space constraints. Summary of the Invention

[0014] The purpose of this invention is to address the shortcomings of existing technologies by providing a construction method for the overall horizontal movement of a pipe jacking machine under space constraints. Before constructing the bottom plate of the pipe jacking working shaft, it is necessary to pre-embed steel threaded connectors and anchor steel plates. The middle plate and top plate are constructed sequentially, and a retaining wall is set up in the hoisting area of ​​the top plate. An integral steel plate is used as the horizontal movement base, and steel support reaction frame, starting base, and jacks and other equipment are installed. Then, a truck crane is used to lift the pipe jacking machine onto the installed starting base. Mechanical grease is evenly applied to the horizontal movement path to reduce drag. The hydraulic cylinders of the jacks are started, and the pipe jacking machine and the starting base are pushed sequentially to the designated area. The pipe jacking is then adjusted again to ensure normal construction.

[0015] This invention provides a construction method for the overall translation of a pipe jacking machine under space-constrained conditions, comprising:

[0016] Step 1: Construct the bottom slab of the pipe jacking working shaft. After the bottom slab reinforcement is tied, 20 10mm thick steel plates with equal spacing are pre-embedded. The middle partition wall straight thread connector is pre-embedded on the bottom slab. The top elevation is flush with the top elevation of the bottom slab.

[0017] Step 2: Construct the middle plate of the pipe jacking working shaft and pre-embed the straight thread connector of the middle partition wall;

[0018] Step 3: Construct the top slab and add a reinforced concrete retaining wall around the hoisting holes of the top slab, which also serves as edge protection for the openings.

[0019] Step 4: Temporarily fix the starting base to the location to be moved, weld and fix the steel support reaction frame to the integral steel plate, evenly apply grease on the moving path, and then insert the pipe jacking machine.

[0020] Step 5: Using the reaction force provided by the steel supports, the pipe jacking machine and the starting base are moved as a whole, advancing 2.5m at a time until the designated position is reached;

[0021] Step 6: Fix the starting guide rail and adjust the pipe jacking machine to make it advance;

[0022] Step 7: Restore the partition wall and hoisting opening in the pipe jacking working shaft.

[0023] Furthermore, in step 1, after the bottom plate reinforcement is tied, 20 200×200×10mm steel plates are embedded at equal intervals within the range of the bottom plate that the pipe jacking machine moves. Holes are cut at the four corners of the steel plates using gas cutting, and ф25 threaded steel bars are inserted into the bottom plate through the holes and plugged. The depth of the steel bars inserted into the bottom plate is 250mm, and the upper part is welded and fixed flush with the steel plate.

[0024] Furthermore, the sleeve elevation of the pre-embedded central partition wall straight thread connector in step 1 and the pre-embedded central partition wall straight thread connector in step 2 is the same.

[0025] Furthermore, in step 3, a reinforced concrete retaining wall is added around the hoisting hole in the top slab, with a height above the ground not less than 1.2m, which also serves as edge protection for the opening.

[0026] Furthermore, step 4 includes:

[0027] Step 4.1: Weld and fix the steel plates required for the overall translation of the pipe jacking machine onto 20 pre-embedded steel plates, and evenly apply grease to the steel plates;

[0028] Step 4.2: Install the launching base, ensuring the guide rail axis and slope requirements are met, and install steel supports and jack limiting devices on both sides of the launching base to prevent slippage during pipe jacking installation;

[0029] Step 4.3: Hoist the pipe jacking machine into the starting guide rail of the working shaft.

[0030] Furthermore, in step 4.1, the overall translation uses a 9000×2000×30mm steel plate. The steel plate is bevel welded using a MIG welder and the welds need to be staggered. Adjacent welds are staggered by 4.5m / 1m and ground smooth. Grease is applied in sections to reduce drag as the jacking pipe is translated.

[0031] Furthermore, in step 4.2, the installation of the starting base requires that the guide rail axis, elevation, and slope meet the requirements of the next pipe jacking; a steel support reaction device is installed on the side of the starting base to be moved, and the weld between the steel support reaction device and the bottom contact surface steel plate is full; a jack is installed between the steel support reaction frame and the starting base, and the hydraulic cylinder is temporarily extended to abut against the starting base.

[0032] Furthermore, in step 4.3, a 400t truck crane is used to lift the pipe jacking machine to be used above the starting base, ensuring a safe distance of not less than 6m from the high-voltage line directly above during the lifting process.

[0033] The beneficial effects of this invention are:

[0034] 1. The construction method for overall translation of the pipe jacking machine under space constraints described in this invention adopts a technical solution of pre-reserving straight threaded steel bar connectors at the upper and lower ends of the partition wall. Compared with the traditional process, this method can prevent the top steel bar from scratching the pipe jacking shell during translation and ensure the flatness of the overall steel plate at the lower end.

[0035] 2. The construction method for overall translation of the pipe jacking machine under space-constrained conditions described in this invention uses an integral steel plate as the translation base, which has many advantages such as high rigidity, low surface friction, convenient material sourcing, and easy recycling.

[0036] 3. The construction method for overall translation of the pipe jacking machine under space-constrained conditions described in this invention uses mechanical grease to reduce drag, which is non-toxic, non-polluting, low-cost, and easy to apply.

[0037] 4. The construction method for overall translation of the pipe jacking machine under space-constrained conditions described in this invention adopts a steel support reaction frame in conjunction with a jack moving device. The jack provides the source of translational force, and the pipe jacking and overall translation construction efficiency is improved by using the reaction force of the steel support to push the pipe in sequence. Moreover, the cost is low and all materials used can be recycled. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall translation and hoisting of the pipe jacking machine under space-constrained conditions in an embodiment of the present invention;

[0039] Figure 2 This is a cross-sectional view of the overall translation of the pipe jacking machine in an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the overall translational plane of the pipe jacking machine in an embodiment of the present invention;

[0041] Figure 4 This is a detailed drawing of the steel plate in an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the connection of the overall steel plate base surface in an embodiment of the present invention.

[0043] In the picture:

[0044] 1-Pipe jacking machine; 2-Steel support reaction frame; 3-Jack; 4-Starting base; 5-Straight thread connector; 6-Truck crane; 7-High voltage power tower and high voltage line; 8-Grease; 9-Integral steel plate; A-200×200×10mm steel plate; B-ф25 threaded steel. Detailed Implementation

[0045] To better understand the above-mentioned objectives, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0046] Example

[0047] This embodiment proposes a construction method for the overall translation of a pipe jacking machine under space constraints, employing the following technical solution: During the construction of the base slab, 20 equally spaced 10mm thick steel plates and a straight threaded connector 5 at the lower end of the central partition wall are pre-embedded; during the construction of the middle slab, a straight threaded connector 5 at the upper end of the central partition wall is pre-embedded; during the construction of the top slab, a reinforced concrete retaining wall is pre-installed around the hoisting hole; the steel plates required for the overall translation of the pipe jacking machine 1 are welded and fixed to the pre-embedded steel plates on the base slab, within the translation range of the starting base 4. Apply grease 8 to the inside to reduce drag; install the starting base 4 and steel support reaction seat above the steel plate to ensure that the axis and slope of the starting guide rail to be jacked meet the requirements, and temporarily extend the jack 3 so that the front end of the cylinder touches the base; use the truck crane 6 to lift the pipe jacking machine 1 into the starting guide rail of the working shaft, and use the steel support to provide reaction force to move the pipe jacking machine 1 as a whole, advancing in a single cycle until it reaches the designated position; debug the pipe jacking equipment, and check again whether the position, elevation and slope of the pipe jacking meet the design requirements.

[0048] Specifically, such as Figure 1-5 As shown, the construction method for the overall translation of the pipe jacking machine under confined space conditions includes:

[0049] Step 1: Construct the base plate of the pipe jacking working shaft. After the bottom plate reinforcement is tied, 20 10mm thick steel plates with equal spacing are pre-embedded. The middle partition wall straight thread connector 5 is pre-embedded on the base plate. The top elevation is flush with the top elevation of the base plate.

[0050] Step 2: Construct the middle plate of the jacking working well and pre-embed the straight threaded connector 5 for the middle partition wall to facilitate the connection of steel bars during the later pouring of the middle partition wall;

[0051] Step 3: Construct the top slab and add a reinforced concrete retaining wall around the hoisting holes of the top slab, which also serves as edge protection for the openings to prevent personnel and objects from falling during construction.

[0052] Step 4: Temporarily fix the starting base 4 to the position to be moved, weld and fix the steel support reaction frame 2 to the integral steel plate 9, evenly apply grease 8 on the moving path, and insert the pipe jacking machine 1.

[0053] Step 5: Using the reaction force provided by the steel support, the pipe jacking machine 1 and the starting base 4 are moved as a whole, advancing 2.5m at a time until the designated position is reached;

[0054] Step 6: Fix the starting guide rail and adjust the pipe jacking machine 1 to make the pipe jacking machine 1 advance;

[0055] Step 7: Restore the partition wall and hoisting opening in the pipe jacking working shaft.

[0056] In step 1 of the above embodiment, after the bottom plate reinforcement is tied, 20 200×200×10mm steel plates A are embedded at equal intervals in the area where the pipe jacking machine 1 moves the bottom plate. The four corners of the steel plates are cut with gas cutting, and ф25 threaded steel bars B are inserted into the bottom plate through the holes and plug welded. The depth of the steel bars inserted into the bottom plate is 250mm. The upper part is flush with the steel plate and welded and fixed, and ground flat and straight without any warping. The top elevation is consistent with the top plate.

[0057] In addition, 20 steel plates A, each 200×200×10mm, are placed along the direction of pipe jacking.

[0058] In step 1 of the above embodiment, the sleeves of the pre-embedded central partition wall straight thread connector 5 and the pre-embedded central partition wall straight thread connector 5 in step 2 are straight and have the same elevation, which facilitates the subsequent binding of the central partition wall reinforcement and the installation of the formwork.

[0059] In step 3 of the above embodiment, a reinforced concrete retaining wall is added around the hoisting hole in the top slab, with a height above the ground not less than 1.2m, which also serves as edge protection for the opening.

[0060] In step 5 of the above embodiment, after the pipe jacking machine 1 is hoisted into the starting base and is successfully debugged, two 100t hydraulic jacks with a stroke of 2.5m are started. The first push is made with the side wall providing reaction force. The maximum pushing distance is 2.5m and the hydraulic cylinder stroke is 0.5m. 0.5m, 1m, 1.5m and 2m push rods are made and used alternately. The push rods are used in this way to advance in a cycle until the machine moves to the designated starting area, the starting base is fixed, the steel plate required for translation is cut off, and the concrete structure of the partition wall in the pipe jacking well is restored.

[0061] Specifically, step 4 includes:

[0062] Step 4.1: Weld and fix the steel plates required for the overall translation of the pipe jacking machine 1 onto the 20 pre-embedded steel plates, and evenly apply grease 8 to the steel plates;

[0063] Step 4.2: Install the starting base 4, ensuring the guide rail axis and slope requirements are met, and install steel supports and jack 3 limiting devices on both sides of the starting base 4 to prevent slippage during pipe jacking installation;

[0064] Step 4.3: Hoist the pipe jacking machine 1 onto the starting guide rail of the working shaft. During hoisting, pay attention to the safe distance between the upper part and the high-voltage power tower and high-voltage line 7.

[0065] In step 4.1 of the above embodiment, the overall translation uses a steel plate of 9000×2000×30mm. The steel plate is bevel welded using a MIG welder and the welds need to be staggered. Adjacent welds are staggered by 4.5m / 1m and polished smooth. Grease 8 is applied in sections to reduce drag as the jacking pipe is translated.

[0066] In step 4.2 of the above embodiment, the installation of the starting base 4 requires that the guide rail axis, elevation and slope meet the requirements of the next pipe jacking; a steel support reaction device is installed on the side of the starting base 4 to be moved, and the weld between the steel support reaction device and the bottom contact surface steel plate is full; a jack 3 is installed between the steel support reaction frame 2 and the starting base 4, and the oil cylinder is temporarily extended to abut against the starting base 4.

[0067] In step 4.3 of the above embodiment, a 400t truck crane 6 is used to lift the pipe jacking machine 1 to be used for jacking into the upper part of the starting base 4. During the lifting, the safe distance between the machine and the high-voltage power tower and high-voltage line 7 directly above must not be less than 6m.

[0068] This invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims.

Claims

1. A construction method for the overall translation of a pipe jacking machine under space constraints, characterized in that, include: Step 1: Construct the bottom slab of the pipe jacking working shaft. After the bottom slab reinforcement is tied, 20 10mm thick steel plates with equal spacing are pre-embedded. The middle partition wall straight thread connector is pre-embedded on the bottom slab. The top elevation is flush with the top elevation of the bottom slab. After the bottom plate reinforcement is tied, 20 200×200×10mm steel plates are embedded at equal intervals in the area where the pipe jacking machine moves the bottom plate. The four corners of the steel plates are cut with gas cutting. ф25 threaded steel bars are inserted into the bottom plate through the holes and plugged. The depth of the steel bars inserted into the bottom plate is 250mm. The upper part is welded and fixed flush with the steel plate. Step 2: Construct the middle plate of the pipe jacking working shaft and pre-embed the straight thread connector of the middle partition wall; Step 3: Construct the top slab and add a reinforced concrete retaining wall around the hoisting holes of the top slab, which also serves as the edge protection structure for the opening; the height above the ground shall not be less than 1.2m, and it also serves as the edge protection structure for the opening. Step 4: Temporarily fix the starting base to the location to be moved, weld and fix the steel support reaction frame to the integral steel plate, evenly apply a layer of grease along the moving path, and then insert the pipe jacking machine. Step 4.1: Weld and fix the steel plates required for the overall translation of the pipe jacking machine onto 20 pre-embedded steel plates, and evenly apply a layer of grease to the steel plates; Step 4.2: Install the launching base, ensuring the guide rail axis and slope requirements are met, and install steel supports and jack limiting devices on both sides of the launching base to prevent slippage during pipe jacking installation; Step 4.3: Hoist the pipe jacking machine onto the starting guide rail of the working shaft; Step 5: Using the reaction force provided by the steel supports, the pipe jacking machine and the starting base are moved as a whole, advancing 2.5m at a time until the designated position is reached; Step 6: Fix the starting guide rail and adjust the pipe jacking machine to make it advance; Step 7: Restore the central partition wall and hoisting opening in the pipe jacking working shaft.

2. The construction method for overall translation of a pipe jacking machine under space-constrained conditions as described in claim 1, characterized in that, The sleeve elevation of the straight threaded connector of the intermediate partition wall pre-embedded in step 1 and the straight threaded connector of the intermediate partition wall pre-embedded in step 2 is the same.

3. The construction method for overall translation of a pipe jacking machine under space-constrained conditions as described in claim 1, characterized in that, In step 4.1, the overall translation uses a 9000×2000×30mm steel plate. The steel plate is bevel welded using a MIG welder and the welds need to be staggered. Adjacent welds are staggered by 4.5m and ground smooth. As the jacking pipe is translated, a layer of grease is applied in sections to reduce drag.

4. The construction method for overall translation of a pipe jacking machine under space-constrained conditions as described in claim 1, characterized in that, In step 4.2, a steel support reaction device is installed on the side of the starting base to be moved, and the weld between the steel support reaction device and the bottom contact surface steel plate is full; a jack is installed between the steel support reaction frame and the starting base, and the oil cylinder is temporarily extended to abut against the starting base.

5. The construction method for overall translation of a pipe jacking machine under space-constrained conditions as described in claim 1, characterized in that, In step 4.3, a 400t truck crane is used to lift the pipe jacking machine to be used above the starting base. During the lifting, ensure that the safe distance from the high-voltage line directly above is not less than 6m.

Images