Shield machine cutterhead assembling method

Abstract

The application discloses a shield machine cutter disc assembling method, and aims to solve the problem of uncontrollable precision when large shield machine cutter discs are assembled in blocks. The method comprises the following steps: (1) constructing a cutter disc welding support platform; (2) arranging support piers; (3) hoisting a center block and leveling the center block; (4) determining the cutter disc center; (5) hoisting an edge block at a corresponding support pier and adjusting the height of the edge block; (6) adjusting the edge block cutter tool track radius; (7) connecting the cutter disc blocks and the center block through corresponding bolts; (8) hoisting a line plummet with the cutter tool seat center as a reference, checking the cutter tool track radius, checking the height and flatness of each hob; (9) checking the radius of the large circular ring in the edge block; (10) welding preparation; and (11) welding operation. Through the cutter disc assembling method, the assembling and welding precision of the cutter disc can be effectively controlled, and the normal tunneling effect of the cutter disc is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield equipment installation, in particular to a shield machine cutterhead assembling method. BACKGROUND

[0002] The shield machine is a large mechanical equipment for underground tunneling construction, which has a metal shell, and the whole machine and part of auxiliary equipment are arranged in the shell. The shield machine performs operations such as soil excavation, soil residue transportation, whole machine propulsion, segment assembly, etc. under the protection of the shield shell. The cutterhead at the front end of the shield machine, as a carrier of various excavation cutters, is a key component for the shield machine to excavate rock and soil. The cutterhead is composed of a driving connection flange, a main beam, a vice beam, a large circular ring and cutters, and plays a role in soil excavation, soil residue stirring, supporting the excavation surface and blocking large rocks.

[0003] With the wide application of shield machines in tunnel construction and the continuous development of shield equipment technology, large-diameter shield equipment has emerged. Since the cutterhead of the shield machine is an oversized structural component, it cannot be manufactured and transported as a whole. Therefore, the current method is to manufacture it in blocks, and then assemble and weld it on site. However, due to the lack of relevant cases in China and the influence of the experience and quality of construction personnel, the precision of the cutterhead assembly and welding is often poor. The precision of the on-site assembly and welding of the shield cutterhead directly affects the performance of the shield machine. Therefore, it is necessary to accurately control the assembly precision of the cutterhead.

[0004] The information disclosed in this BACKGROUND section is only for the purpose of enriching the understanding of the background of the present disclosure and should not be considered as admitting or implying in any form that it constitutes the prior art known to those skilled in the art. SUMMARY

[0005] In view of at least one of the above technical problems, the present disclosure provides a shield machine cutterhead assembling method to solve the problem of uncontrollable precision when assembling large shield machine cutterheads in blocks.

[0006] According to one aspect of the present disclosure, a shield machine cutterhead assembling method is provided, comprising the following steps:

[0007] (1) A cutterhead welding platform is constructed within the range of the cutterhead welding area. The cutterhead welding platform is reinforced by using mixing piles and / or rotary jet piles, and the platform surface is poured with concrete not less than C35;

[0008] (2) Support piers are arranged at the positions of the cutterhead center block and each edge block corresponding to the cutterhead welding platform. The support piers corresponding to the cutterhead center block are arranged in a corresponding circle, and the support piers corresponding to the cutterhead edge block are arranged in a corresponding radial direction. The support piers include adjusting piers and supporting piers. The top of each adjusting pier is fixedly provided with a screw jack, and the adjusting piers and the supporting piers are arranged in pairs.

[0009] (3) hoist the center block at the corresponding support piers and level the center block, and take the large flange of the center block as the reference to adjust the screw jacks on the top of the corresponding adjustment piers to be within 1 mm of the large flange flatness; after the adjustment is stable, fill the gap between the top of the support pier and the cutter disc surface with steel plates;

[0010] (4) determine the cutter disc center, observe and review the center of the large flange of the cutter disc according to the machined surface of the large flange, and record the position of the center as the cutter disc center;

[0011] (5) hoist the edge block at the corresponding support piers and adjust the height of the edge block, the support piers are arranged under the large ring of the edge block and the main beam and the secondary beam, the edge block is connected to the center block by connecting blocks to ensure that the gap at the butt joint of the edge block and the center block is less than 3 mm; the screw jacks on the top of the corresponding adjustment piers are adjusted to make the flatness of the machined surface of the cutter barrel mounting hole of the normal pressure cutter and the machined surface of the normal pressure cutter welding seat of the cutter disc block less than 3 mm, and the flatness of the plane formed by the highest points of the pressure scraping cutters is less than 5 mm;

[0012] (6) adjust the cutter track radius of the edge block, and adjust the position of the edge block relative to the center block to make the normal pressure cutter track radius on the edge block enlarged by 4-7 mm based on the design size;

[0013] (7) after installing the corresponding disc-shaped anti-deformation tooling in each cutter hole, bolt the cutter disc blocks and the center block correspondingly;

[0014] (8) take the center of each cutter seat as the reference to hoist the plumb bob, review whether the cutter track radius is enlarged by 4-7 mm based on the design size, and erect a level meter outside the cutter disc to review the height and flatness of the cutters;

[0015] (9) review the radius of the large ring in the edge block to make the radius tolerance of the large ring ±10 mm, and detect whether the back flatness of the cutter welding seat is less than 0.3 mm, and if not, perform grinding;

[0016] (10) welding preparation, before welding, perform overall backing of all to-be-welded seams with a depth of 14-16 mm, and arrange process supports at the corresponding positions of the to-be-welded seams;

[0017] (11) welding, first weld the connecting welds of the edge block and the center block, then weld the secondary beam welds, and finally weld the large ring welds; the welding of the edge block and the center block is first performed on the side plate butt joint, then on the front plate butt joint, and finally on the rear plate butt joint.

[0018] In some embodiments of the present disclosure, in the step (1), after the completion of the cutter disc welding support platform, the cutter disc is assembled on the cutter disc welding support platform and left to stand for not less than 24 hours, and the settlement data of the cutter disc welding support platform before and after standing is recorded and calculated. If the settlement data exceeds the cutter disc welding standard, the cutter disc welding support platform is reinforced.

[0019] In some embodiments of the present disclosure, in the step (2), the support pier height meets the requirement for erecting the cutter disc, and the cutter disc is allowed to be operated and welded by personnel entering from the ground.

[0020] In some embodiments of the present disclosure, in the step (3), before hoisting, the groove at the welding position of the cutter disc center block and each edge block is polished, and the welding area and both sides 30-50 mm are polished to a metallic luster.

[0021] In some embodiments of the present disclosure, in the step (5), if the gap at the butt welding seam between the edge block and the center block is greater than 3 mm, the groove at the welding seam is supplemented to make the gap less than 3 mm.

[0022] In some embodiments of the present disclosure, in the step (6), after the completion of the adjustment of the normal pressure cutter track radius, the normal pressure cutter track radius and the pressure cutter track radius are adjusted to be 4-7 mm larger than the design size.

[0023] In some embodiments of the present disclosure, in the step (7), the anti-deformation tool is installed in a cold installation mode, the cold installation temperature is-90℃ to-110℃, and after cold installation, a stop block for preventing the anti-deformation tool from falling off is welded at the corresponding position of the cutter disc block.

[0024] In some embodiments of the present disclosure, in the step (8), the review of the cutter track radius is first to observe at least three points on the circular edge line of the cutter barrel top surface to fit the center, then to observe not less than three points on the circumference of the cutter barrel base to fit the center and calculate the consistency of the two center data, and if the two centers are consistent, the corresponding cutter track radius is reviewed whether it is enlarged by 4-7 mm on the basis of the design.

[0025] In some embodiments of the present disclosure, in the step (10), the process support is specifically an anti-deformation steel plate or a concave plate.

[0026] In some embodiments of the present disclosure, in the step (10), after the completion of the cutter disc assembly, a welding operation room for preventing wind, rain and heat preservation is assembled and built on site.

[0027] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: by reducing the settlement of the cutterhead welding platform, the adjustable support height adjustment pier, and the measurement and verification of the cutter trajectory radius, cutter height and flatness, the accuracy of cutterhead assembly is greatly improved, and the misalignment between the blocks or the flatness of the cutterhead not meeting the design requirements is avoided, which would affect the normal tunneling of the shield and the accuracy of the tunneling. Attached Figure Description

[0028] Figure 1 This is a schematic diagram showing the arrangement of the support piers corresponding to the various sections of the cutterhead in one embodiment of this application.

[0029] Figure 2 This is a side view of the support pier in one embodiment of this application.

[0030] Figure 3 This is a cross-sectional view of the anti-deformation tooling for the hobbing cutter welding seat in one embodiment of this application.

[0031] Figure 4 This is a cross-sectional view of the anti-deformation tooling for the cutting blade welding seat in one embodiment of this application.

[0032] In the above figures, 10 is the center block support pier, 11 is the center block adjustment pier, 13 is the center block adjustment pier screw jack, 20 is the side block support pier, 21 is the side block adjustment pier, 23 is the side block adjustment pier screw jack, 30 is the roller cutter welding seat, 31 is the roller cutter welding seat anti-deformation fixture, 32 is the rolling welding seat stop block, 40 is the cutter welding seat, 41 is the cutter welding seat anti-deformation fixture, and 42 is the cutter welding seat stop block. Detailed Implementation

[0033] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] This example discloses a method for assembling the cutterhead of a tunnel boring machine, including the following steps:

[0035] (1) A cutterhead welding platform is constructed within the area of ​​the cutterhead welding area. The cutterhead welding platform is reinforced with mixing piles and / or jet grouting piles to strengthen the stratum, and the platform surface is poured with concrete of not less than C35.

[0036] Since the cutterhead assembly area has high requirements for the foundation and the ground, in order to avoid the influence of settlement on the welding precision and quality of the cutterhead, a cutterhead welding support is arranged in the cutterhead welding area to bear the weight of the cutterhead and prevent ground settlement. In the embodiment, the cutterhead welding support is reinforced by the mixing pile; in some other embodiments, the soil layer is reinforced by the rotary jet pile to ensure the bearing requirement of the foundation. In addition, in order to meet the ground requirement in the cutterhead assembly area, after the pile foundation is reinforced, the surface of the support is poured with concrete with a strength of no less than C35 according to the corresponding bearing capacity calculation, so as to ensure the flatness and certain bearing capacity of the surface of the cutterhead welding support.

[0037] In the embodiment, the size and thickness of the cutterhead welding support are determined according to the size and weight of the cutterhead, and the minimum thickness and width that ensure the stability of the cutterhead settlement are taken as the design standard of the support. A cutterhead welding support with a size of 0.5*14*14 m is arranged in the cutterhead welding area. In some other embodiments, considering that the size and weight of the cutterhead are certain, the larger the size of the support is, the more stable the settlement is, so a cutterhead welding support with a large size is designed.

[0038] In addition, after the cutterhead enters the site, the cutterhead to be assembled is placed on the cutterhead welding support and is kept still for no less than 24 hours, and the settlement data of the cutterhead welding support before and after the cutterhead is kept still is recorded and calculated to observe whether the cutterhead welding support reaches the stable settlement, so as to avoid the situation that the bearing capacity of the cutterhead welding support does not meet the requirement and the cutterhead welding support settles after bearing a heavy cutterhead, which affects the assembly precision and quality. If the settlement data exceeds the cutterhead welding standard, the cutterhead welding support needs to be reinforced and observed again until the settlement is stable.

[0039] (2) The support piers are arranged at the positions of the cutterhead center block and each edge block corresponding to the cutterhead welding support.

[0040] Since the flatness of the cutterhead welding support is limited and cannot be controlled within an accurate range, and a certain operation space is needed below the cutterhead during the assembly, leveling and welding of the cutterhead, so that the construction personnel can enter, in the embodiment, a plurality of support piers are arranged at the corresponding positions of the cutterhead welding support to support each cutterhead block. Since the cutterhead is heavy, the material of the support piers has certain requirements. In the embodiment, the support piers are made of Q235 low-carbon alloy steel, and in some other embodiments, the support piers are made of 1345 low-carbon alloy steel to meet more stringent bearing requirements.

[0041] In this design, and for ease of transport, the cutter head is divided into a central block and several side blocks. To ensure reliable support, the support blocks corresponding to the central block are arranged circumferentially according to the size of the central block, ensuring stable support. The remaining side blocks are spliced ​​along the circumference of the central block, so the support blocks corresponding to the side blocks are arranged radially. This ensures that the force on each part of the cutter head is even, preventing tilting or even overturning.

[0042] Considering that even after the cutterhead sections are stably placed on the top surfaces of their respective support blocks, the flatness and other assembly requirements cannot be met, adjustments need to be made to each section before assembly to ensure the distance between sections and the overall flatness and other control requirements. Therefore, in this embodiment, the support blocks include adjusting blocks and retaining blocks. The retaining blocks provide initial support for each cutterhead section, while the adjusting blocks are fixedly equipped with screw jacks on their tops. The lifting action of the jacks adjusts the position of the corresponding cutterhead section. These two types of blocks appear in pairs and are used in conjunction with each other. See [reference needed]. Figures 1-2 In this example, a pair of center block adjusting blocks 11 and center block support blocks 10 are arranged in a circular pattern at the corresponding position of the center block of the cutter head. The center block adjusting block 11 has a height of 500mm, and a 50T screw jack 12 is fixed on the top surface of the block for leveling the center block of the cutter head. The center block support block 10 has a height of 950mm. Similarly, a pair of side block adjusting blocks 21 and side block support blocks 20 are arranged radially along both sides of the edge of the side block at the corresponding position of the cutter head to facilitate flatness adjustment. Since the corresponding block of the center block rests against the large flange structure on the bottom surface of the center block, while the side block rests directly against the bottom surface of the cutter head, the height of the side block support block is higher than that of the center block support block. Specifically, in this example, the height of the side block adjusting block 21 is 900mm, and a 32T screw jack 23 is fixed on the top surface of the block for leveling the corresponding block. The height of the side block support block 20 is 1350mm. The support piers, with a minimum support height of 90cm, ensure that construction personnel can access the area beneath the cutterhead for welding operations. In other embodiments, support piers of different heights that still meet the construction space requirements are selected.

[0043] In addition, in this example, each support pier of the side block is a square column to increase the contact area and ensure stable support. However, considering that the large flange of the center block has a certain width and the center block is located at the center of the cutterhead, if a square column is used for support, the corners of the pier protruding from the large flange may interfere with the position adjustment of other side blocks, causing obstruction. Therefore, in this embodiment, each support pier of the center block adopts a cylindrical pier structure.

[0044] (3) Hoist the center block at the corresponding support pier and level the center block. Take the large flange of the center block as the reference, and adjust the screw jacks on the top of the corresponding support pier to within 1mm of the flatness of the large flange. After the adjustment is stable, fill the gap between the top of the support pier and the cutter disc with a steel plate.

[0045] After each support pier is arranged at the corresponding position of the cutter disc welding bearing platform, the hoisting operation of each sub-block of the cutter disc on the support pier can be started. However, considering the space limitation of the position to be welded after the assembly of each sub-block of the cutter disc, and the rust, burrs and other problems on the welding surface during the transportation and storage of each sub-block after leaving the factory, which affect welding, the bevel of the welding position of the center block and each edge block of the cutter disc needs to be polished before hoisting, and the welding area and both sides 30-50mm are polished to a metallic luster.

[0046] In addition, since the cutter disc is disassembled into a center block and a plurality of sub-blocks, each sub-block is arranged along the circumference of the center block based on the center block, so the hoisting operation of the center block is first performed. After the large ring of the center block is stably placed on the top of the corresponding center block support pier, the screw jacks fixed on the top of the center block adjustment pier can be driven to lift until they contact the center block, and then the center block is leveled.

[0047] Considering that the center block includes a large flange for connecting the cutter disc and the main shaft, and the large flange is used as the connection engagement surface and the main force acting surface for transmitting the force of the cutter disc, the machining surface of the large flange has high machining flatness. Therefore, in this embodiment, the machining surface of the large flange is selected as the basis surface for adjusting the cutter disc, and the flatness of the large flange is rechecked before use to avoid errors. When leveling the center block, the flatness observation data of the large flange is used as the adjustment basis to adjust the screw jacks at the corresponding positions, so that the flatness of the large flange is within 1mm.

[0048] After the adjustment of the screw jacks on the top of the center block adjustment pier, a gap may be generated between the top surface of the center block support pier and the large flange surface of the center block. To ensure the supporting effect of the support pier, in this embodiment, steel plates of various thicknesses such as 1-20mm are prepared for auxiliary leveling. The gap between the center block support pier and the large flange of the center block is filled to ensure the effective support of the center block support pier on the center block.

[0049] (4) Determine the center of the cutter disc. The center of the cutter disc is determined according to the machining surface of the large flange of the cutter disc, and the position of the center is recorded as the center of the cutter disc.

[0050] When the center block is adjusted, the remaining blocks of the cutter head can be hoisted and adjusted. Since each block is spliced based on the center block, in order to verify whether each block is adjusted to a suitable position to meet the splicing and welding requirements, in the embodiment, the radius of the trajectory of each tool hole to the center of the cutter head is used as one of the evaluation criteria. Therefore, the position coordinates of the center of the cutter head need to be known. Considering that the large flange of the center block is concentric with the cutter head and has high machining surface flatness, it is convenient to obtain relatively accurate data, therefore, in the embodiment, the center of the cutter head is calculated based on the observation data of the center of the large flange, so as to facilitate subsequent determination of whether the trajectory radius of each tool meets the design, and further determine whether each block is adjusted to the right position.

[0051] (5) Hoist the edge block to the corresponding support pier and adjust the height of the edge block.

[0052] When hoisting the edge block, the support piers are arranged under the large ring and the main beam and the secondary beam of the edge block to ensure reliable contact and support between the support piers and the edge blocks of the cutter head, and then the connecting blocks are used to connect the edge blocks and the center block. In the embodiment, the 50mm concave connecting blocks are used to preliminarily connect the edge blocks and the center block to ensure the processing and assembly standards of the cutter head. In addition, considering that when the gap between the bevels of each block is too large, the strength of the welded part will be reduced and the stress requirement cannot be met, therefore, in the example, the gap width between the butt welding seams of the edge block and the center block is ensured to be less than 3mm. If the gap between the butt welding seams of the edge block and the center block is greater than 3mm, the bevel of the welding seam is repaired to make the gap less than 3mm. Considering that the corresponding bevels of the center block and the edge block are the main welding seams between each block of the cutter head and bear relatively large structural force, the welding needs to be completed at one time and the welding temperature needs to be strictly controlled to prevent problems such as gap or poor fusion, therefore, the same process parameters as the formal welding are used when repairing the bevel of the welding seam, but the formal bevel cannot be directly connected to avoid the problem that the welded part cannot meet the welding stress requirement.

[0053] After the cutter head edge block is initially connected with the cutter head center block through the connecting block, further accurate adjustment of the cutter head edge block position is required. First, the height of the edge block needs to be adjusted. After the edge block is placed on the corresponding support pier, preliminary support is performed by the edge block support pier, and then the screw jacks fixed on the top of the edge block adjustment pier below the edge block are driven to adjust the height of the cutter head edge block. Among them, considering that the height difference between the machining surface of the normal pressure cutter barrel mounting hole and the machining surface of the normal pressure cutter welding seat and the cutter head cutter is consistent, the adjustment of the cutter head edge block can be based on the machining surface of the normal pressure cutter barrel mounting hole and the machining surface of the normal pressure cutter welding seat as the reference, and the cutter head flatness is adjusted accordingly, so that the cutter head flatness is less than 3mm and the flatness of the plane formed by the highest points of each pressure scraping cutter cutter is less than 5mm, thereby achieving the adjustment and control of the flatness of the cutter head block, and without the installation of the cutter barrel and the cutter, the problem that the cutter barrel cannot be normally pulled out due to the sealing or deformation of the cutter barrel during the subsequent cutter head welding process is prevented.

[0054] (6) Adjust the edge block cutter trajectory radius, and adjust the position of the edge block relative to the center block, so that the normal pressure cutter trajectory radius on the edge block is enlarged by 4-7mm based on the design size.

[0055] The adjustment of the edge block height makes the cutter head reach the required flatness for welding and meets the use requirements. However, considering that during the welding process, each edge block will be gathered towards the welding center due to thermal expansion and contraction, which will cause errors, so the distance of each edge block relative to the cutter head center block needs to be increased by a certain length.

[0056] In this embodiment, since the distance of the cutter head cutter from the cutter head center is determined, the cutter is taken as the measurement reference, the distance of the cutter from the center of the cutter head center block is taken as the trajectory radius of the cutter, the distance of each edge block relative to the cutter head center block is adjusted, and the trajectory radius of the normal pressure cutter on the edge block is enlarged by 4-7mm based on the design size. After the adjustment of the normal pressure cutter trajectory radius is completed, the normal pressure cutter trajectory radius and the pressure scraping cutter trajectory radius are adjusted to exceed the design size by 4-7mm, thereby ensuring the final cutter head assembly and welding precision.

[0057] In other embodiments, since the secondary beam is connected with the main beam and the cutter head outer circular ring, it is generally arranged at the center of the slag chute, connected between the main beams through a grid, used for cutting slag, preventing large particle size slag from entering the rear side of the cutter head, and needs to be assembled after the main beam is installed. To ensure the installation accuracy of the secondary beam and control the trajectory radius of the edge scraping cutter, it is enlarged by 4-7mm based on the design, avoiding errors caused by welding.

[0058] (7) After the corresponding disc-shaped anti-deformation tool is installed in each block cutter hole, the bolts are connected to connect each block of the cutter head with the center block.

[0059] After the flatness of the cutter head edge block and the position relative to the center block are adjusted, further reinforcement connection is carried out by using bolts. However, considering that, on the one hand, in order to control the hoisting weight of the cutter head when it is lowered into the well and the convenience of installation, each cutter is assembled after being correspondingly mounted and docked on the shield machine, and the connection between the center block and the edge block is subjected to tension, which may cause the change of the block structure and the deformation of the cutter drum, and the cutter cannot be normally installed in the later period; on the other hand, the cutter drum hole is affected by thermal expansion and cold contraction during the welding of the cutter head, which may cause deformation. Therefore, in the embodiment, 19-inch double connection cutter drum anti-deformation tooling and cutter seat anti-deformation tooling are installed in the cutter welding seat and the cutter drum welding seat hole which are not installed with the normal pressure cutter changing device by using the cold mounting method. Referring to Figures 3-4 Each anti-deformation tooling is a disc-shaped structure, and the size thereof is matched with the size of the corresponding welding seat. In order to avoid falling off, after the anti-deformation tooling is installed in the corresponding welding seat, the corresponding stopper is welded to play the blocking and limiting role of the anti-deformation tooling. In order to prevent deformation caused by welding, each anti-deformation tooling is cooled to -90℃ to -110℃ by liquid nitrogen before cold mounting, and due to thermal expansion and cold contraction, the installation is more convenient.

[0060] (8) The wire plummet is hung with the center of each cutter seat as the reference to review whether the radius of each cutter track is enlarged by 4-7mm on the basis of the design size; and the level is erected outside the cutter head to review the height and flatness of each cutter.

[0061] After the center block and the edge block of the cutter head are connected by bolts, the cutter head needs to be detected and reviewed before formal welding to avoid errors and affect the normal work of the cutter head. First, the flatness of the center block of the cutter head is reviewed, and then whether the diameter change of each cutter track meets the design requirements is reviewed. Three points on the circular edge of the top surface of the cutter drum are selected, the three-dimensional coordinates thereof are measured, and the center position thereof is calculated. Similarly, at least three points on the circumference of the cutter drum base are observed and the center of the cutter drum base is fitted. The relationship between the two center positions is compared to determine whether the cutter drum is deformed. The coordinates of the corresponding center that meets the requirements are taken as the reference for calculating the radius of the track between the cutter drum and the center block. Whether the radius of the track of the corresponding cutter meets the design size is reviewed. In addition, the total station and the level are erected outside the cutter head. The position relationship of the cutter relative to the design size, such as normal vector, height difference, roundness and plane position, is calculated based on the fitting center surface data of the center block flange plate to determine whether the assembled cutter head meets the design requirements.

[0062] (9) The radius of the large circular ring in the edge block is reviewed, and the tolerance of the radius of the large circular ring is ±10mm; and whether the back flatness of the cutter welding seat is less than 0.3mm is detected. If not, the grinding is carried out.

[0063] The diameter of the big circle ring is the diameter of the outer hub of the cutter head. After the cutter head is assembled, the welding shrinkage during subsequent welding is considered, so the tolerance of the radius of the big circle ring is set to ±10mm, and whether the flatness of the back surface of the hob welding seat is less than 0.3mm is detected. If it does not meet the requirements, grinding treatment is performed to make it meet the flatness requirements.

[0064] (10) Welding preparation, before welding, the overall depth of all welds is 14-16mm, and process supports are arranged at the corresponding positions of the welds.

[0065] After the cutter head is assembled, a welding operation room for wind and rain prevention, heat preservation is assembled on the cutter head. The length and width of the operation room need to ensure that there is more than 2m of activity space around the cutter head, the height needs to ensure that there is 2m of clear height above the front panel of the cutter head, and corresponding smoke exhaust facilities are arranged.

[0066] In addition, in the present embodiment, before welding, all the welds to be welded are subjected to overall grounding treatment with a depth of 15mm, and process supports are added on both sides of the welds to be welded to ensure reliable support stress at the welds and reduce welding deformation. In the present example, a concave plate is selected as the process support, and in other embodiments, a deformation-resistant steel plate is used as the process support.

[0067] (11) Welding, first weld the connecting welds between the edge blocks and the center block, then weld the welds of the vice beams, and finally weld the welds of the big circle ring; wherein the welding of the edge blocks and the center block first welds the butt welds of the side plates, then welds the butt welds of the front panels, and finally welds the butt welds of the rear panels.

[0068] The welding is performed from the center to the periphery, first the welding between the center block and the edge block, then the welding between the edge blocks and the sub-beams, and finally the welding of the outer large circular ring. In the welding process of the edge block and the center block, according to the position relationship between the center block and the edge block, the several contact surfaces of the edge block are respectively called side plate, front panel and rear panel. In the welding of the side plate butt joint, the half depth of the vertical weld inside the cutter head is welded first, the root is cleaned, then the vertical weld outside the cutter head is welded, and finally the vertical weld inside the cutter head is welded, which needs two welders to weld vertically on the left and right sides at the same time, the welding direction and the welding speed are kept consistent, each weld is welded from the lower end to the upper end, and then the next weld is welded, the preheating and interpass temperature is controlled at 80-120℃; in the welding of the front panel butt joint, the vertical weld inside the cutter head is welded first, the root is cleaned, and then the horizontal weld outside the cutter head is welded. Each weld is welded from one end to the other end by 300-400mm long small section, and then the next weld is welded, the preheating and interpass temperature is controlled at 50-80℃; for the welding of the rear panel butt joint, the half depth of the horizontal weld inside the cutter head is welded first, the root is cleaned, then the vertical weld outside the cutter head is welded, and finally the horizontal weld inside the cutter head is welded, and each weld is welded from one end to the other end by 300-400mm long small section, and then the next weld is welded, the preheating and interpass temperature is controlled at 80-120℃. After the welding is completed, the data of the cutter head is rechecked, and the cutter head can be hoisted into the well after the data is confirmed to be correct.

[0069] Although some preferred embodiments of the present application have been described, those skilled in the art who understand the basic inventive concept can make additional changes and modifications to the embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0070] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A method for assembling a cutter head of a tunneling machine, characterized in that, It comprises the following steps: (1) A cutter welding support is made in the range of the cutter welding area, the cutter welding support is reinforced by using mixing piles and / or rotary jet piles, and the support surface is poured with concrete with a strength not less than C35; (2) Support piers are arranged at the positions of the cutter center block and each edge block of the cutter welding support, the support piers corresponding to the cutter center block are arranged in the corresponding circumferential direction, and the support piers corresponding to the cutter edge block are arranged in the corresponding radial direction; the support pier comprises an adjusting pier and a supporting pier, a screw jack is fixedly arranged at the top of the adjusting pier, and the adjusting pier and the supporting pier are arranged in pairs; the support pier is supported at the positions of the four corners of the cutter edge block along the radial direction of the cutter; (3) The center block is hoisted to the corresponding support pier and leveled, the screw jack at the top of the adjusting pier is adjusted to be within 1mm of the flatness of the large flange of the center block; after the adjustment is stable, a steel plate is filled in the gap between the top of the supporting pier and the cutter surface; (4) The cutter center is determined, the center of the large flange of the cutter is observed and reviewed according to the machining surface of the large flange, and the position of the center is recorded as the cutter center; (5) The edge block is hoisted to the corresponding support pier and the height of the edge block is adjusted, the support piers are arranged under the large circular ring and the main beam auxiliary beam of the edge block, the edge block and the center block are connected by connecting blocks, and the gap width between the edge block and the center block at the butt joint is ensured to be less than 3mm; the screw jack at the top of the corresponding adjusting pier is adjusted, the flatness of the machining surface of the cutter barrel mounting hole of the cutter block under pressure and the machining surface of the cutter welding seat under pressure is less than 3mm, and the flatness of the plane formed by the highest points of each pressure scraping cutter is less than 5mm; (6) The edge block cutter track radius is adjusted, and the position of the edge block relative to the center block is adjusted, so that the cutter track radius on the edge block is enlarged by 4-7mm based on the design size; (7) After the corresponding disc-shaped anti-deformation tool is arranged in each cutter hole, the cutter blocks and the center block of the cutter are connected by corresponding bolts; (8) The wire plummet is hoisted with the center of each cutter seat as the reference to review whether the cutter track radius is enlarged by 4-7mm based on the design size; and a level is erected outside the cutter to review the height and flatness of each cutter; (9) The radius of the large circular ring in the edge block is reviewed, so that the radius tolerance of the large circular ring is ±10mm; and the flatness of the back surface of the cutter welding seat is detected whether it is less than 0.3mm, and if not, it is ground; (10) Welding preparation, the overall depth of all welds is 14-16mm before welding, and process supports are arranged at the corresponding positions of the welds; (11) Welding, the connecting welds of the edge block and the center block are welded first, then the auxiliary beam welds are welded, and finally the large circular ring welds are welded; wherein the side plate butt joint welds of the edge block and the center block are welded first, then the front plate butt joint welds are welded, and finally the rear plate butt joint welds are welded.

2. The method according to claim 1, wherein, In the step (1), after the cutter welding support is completed, the cutter is assembled on the cutter welding support and left to stand for not less than 24 hours, and the settlement data of the cutter welding support before and after standing is recorded and calculated; if the settlement data exceeds the cutter welding standard, the cutter welding support is reinforced.

3. The method of claim 1, wherein, In the step (2), the support pier height meets the corresponding erection of the cutter head, and the cutter head is allowed to enter the personnel operation welding.

4. The method of claim 1, wherein, In the step (3), the slope of the welding joint of the center block and the edge block of the cutter head is polished before hoisting, and the welding area and both sides 30-50mm are polished to the metal gloss.

5. The method of claim 1, wherein, In the step (5), if the gap of the butt joint of the edge block and the center block is greater than 3mm, the gap of the butt joint is supplemented to less than 3mm.

6. The method of claim 1, wherein, In the step (6), after the adjustment of the track radius of the normal pressure cutter is completed, the track radius of the normal pressure cutter and the track radius of the pressure scraper are adjusted to be 4-7mm larger than the design size.

7. The method of claim 1, wherein, In the step (7), the anti-deformation tool is installed in a cold installation mode, the cold installation temperature is-90℃ to-110℃, and the stop block for preventing the anti-deformation tool from falling off is welded at the corresponding position of the cutter head block after cold installation.

8. The method of claim 1, wherein, In the step (8), the cutter track radius is reviewed by observing at least three points on the circular edge line of the cutter barrel top surface, fitting the center, then observing not less than three points on the circumference of the cutter barrel base, fitting the center and calculating the consistency of the two center data, if consistent, whether the corresponding cutter track radius is enlarged by 4-7mm based on the design.

9. The method of claim 1, wherein, In the step (10), the process support is specifically an anti-deformation steel plate or a concave plate.

10. The method of claim 1, wherein, In the step (10), after the cutter head is assembled, a welding operation room for wind and rain prevention and heat preservation is assembled and built on site.

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