Composite under-pressure cutterhead for complex stratum with silty clay mixed with large amount of calcareous nodules

Abstract

The utility model belongs to the field of shield construction, aims at a super-large-diameter shield tunneling machine cutterhead of a soft soil stratum, and particularly relates to a composite under-pressure cutterhead of a complex stratum with silty clay mixed with a large number of calcium nodules, which can solve the problems of serious cutter abrasion and high cutter changing frequency in the complex stratum with the silty clay mixed with the large number of calcium nodules. The utility model relates to a high-strength high-strength radial cutter head which can keep excellent performance in a high-strength stratum and comprises a cutter head body, a plurality of main arm spokes are arranged on the front face of the cutter head body and are distributed in a radial shape around the center of the cutter head body, and auxiliary arm spokes are arranged between every two adjacent main arm spokes. A plurality of central duplex serrated knives are arranged at the central position of the cutterhead body, a plurality of welding type tearing knives are fixed on the main arm spokes in a welding manner, and a plurality of replaceable tearing knives are fixed on the auxiliary arm spokes in a bolt connection manner; the edge of the cutterhead body is provided with a plurality of group edge scrapers, and the main arm spoke is also provided with a plurality of front scrapers.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of shield construction, aiming at the cutter head of super diameter shield machine in soft soil layer, specifically relates to a complex stratum composite pressure cutter head of silty clay intercalated with a large number of calcareous nucleus. BACKGROUND

[0002] It is known that shield machine is a tunnel boring machine using shield method, and the construction method of shield is that the tunneling machine constructs (lays) the "shield" (referring to the supporting segment) of tunnel while tunneling, and the basic working principle is that a cylindrical steel assembly advances along the tunnel axis while excavating soil. The shell of the cylindrical assembly, i.e. the shield, temporarily supports the excavated tunnel section without lining, bears the pressure of the surrounding soil layer, and sometimes also bears the underground water pressure and blocks the underground water outside. The excavation, soil removal and lining operations are carried out under the protection of the shield. Among them, the cutter head is the core component of the shield machine, and the cutter head usually includes a cutter head body, cutters and foam pipelines, etc. The cutter head body is welded by steel structure, and the cutters include rolling cutters, cutting knives and scraping knives, etc.

[0003] However, in the face of high-strength strata such as silty clay intercalated with a large number of calcareous nucleus complex strata, the traditional cutters are often difficult to withstand the huge wear and impact, resulting in short service life of the cutters on the cutter head and high cutter replacement frequency. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a silty clay intercalated with a large number of calcareous nucleus complex stratum composite pressure cutter head, can solve the problem of serious cutter wear and high cutter replacement frequency in the face of silty clay intercalated with a large number of calcareous nucleus complex strata, can maintain excellent performance in high-strength strata, thereby effectively prolonging the service life of the cutters and greatly reducing the number of cutter replacement, and reducing the construction cost.

[0005] The utility model is realized through the following technical schemes:

[0006] A silty clay intercalated with a large number of calcareous nucleus complex stratum composite pressure cutter head, including cutter head body, the front of cutter head body is equipped with a plurality of main arm spokes, a plurality of main arm spokes are distributed radially with the center of cutter head body, and the auxiliary arm spoke is equipped between the two main arm spokes of adjacent;

[0007] The center position of cutter head body is provided with a plurality of center double teeth cutters, and a plurality of center double teeth cutters are distributed radially with the center of cutter head body, each center double teeth cutter contains a center cutter seat, the center cutter seat is fixed on cutter head body, and the first teeth cutter and the second teeth cutter are sequentially installed on the center cutter seat from inside to outside through the bolt assembly, and the vertex of first teeth cutter is higher than the vertex of second teeth cutter;

[0008] A plurality of welded tear knives are fixed on the main arm spokes by welding, and a plurality of replaceable tear knives are fixed on the auxiliary arm spokes by bolting;

[0009] A plurality of group edge scrapers are arranged on the edge of the cutter head body, and a plurality of front scrapers are arranged on the main arm spokes.

[0010] Further, the number of the main arm spokes is eight, and the number of the center double-tooth knives is four.

[0011] Further, the blade spacing of the center double-tooth knives is 100 mm, and the blade spacing of the welded tear knives is 100-200 mm.

[0012] Further, the blade of the welded tear knife is an alloy acute-angle cutter head.

[0013] Further, the number of the welded tear knives is 38, the number of the replaceable tear knives is 63, the number of the front scrapers is 154, and the number of the group edge scrapers is 16.

[0014] The beneficial effects obtained by the utility model compared with the prior art are as follows:

[0015] 1. The welded tear knives and the front scrapers are arranged on the main arm spokes, the replaceable tear knives are arranged on the auxiliary arm spokes, and the group edge scrapers are arranged on the edge of the cutter head body, so that most of the cutters are concentrated on the main arm spokes, the auxiliary arm spokes and the edge, the opening rate of the cutter head is increased through the optimized design of the cutter head structure, the slag discharge is facilitated, the cutters are reasonably arranged and configured, the cutter head torque is reduced, and the stability of the cutter head is improved.

[0016] The various cutters are optimized and designed, the impact resistance and wear resistance of the cutters are improved, and the service life of the cutters is prolonged, the utility model is reasonable in configuration, advanced in technology, high in reliability, strong in practicability, and suitable for clay-calcareous nodule mixed stratum shield tunneling.

[0017] 2. The vertex of the first tooth cutter of the center double-tooth cutter is higher than the vertex of the second tooth cutter, which is beneficial to the centering of the cutter head and improves the stability thereof, and the cutter head can fully adapt to the clay-calcareous nodule mixed stratum shield tunneling.

[0018] 3. The blade of the welded tear knife is an alloy acute-angle cutter head, which is beneficial to the tearing of the cutter head to the soft soil working face and reduces the cutter head torque.

[0019] 4. The front scraper and the group edge scraper can ensure that the scraper fully covers and scrapes the working face. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is a whole schematic view of the composite type pressurized cutter head for the complex stratum with a large number of calcareous nodules mixed with powder clay.

[0021] Fig. 2 The utility model discloses a center double gear cutter schematic view.

[0022] In the drawing: 1, cutter head body, 2, main arm spoke, 3, auxiliary arm spoke, 4, center double gear cutter, 41, center cutter seat, 42, first gear cutter, 43, second gear cutter, 5, welded tear cutter, 6, replaceable tear cutter, 7, front scraper, 8, group edge scraper. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0024] In the description of the utility model, it needs to be understood that the terms "front", "back", "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0025] As Figs. 1-2 shown, the embodiment discloses a complex stratum composite pressure cutter disc for silty clay mixed with a large number of calcareous nodule, including cutter disc body 1, eight main arm spokes 2 are processed on the front face of cutter disc body 1, the eight main arm spokes 2 are distributed in a radial manner with the center of cutter disc body 1, and one auxiliary arm spoke 3 is installed between every two adjacent main arm spokes 2.

[0026] In the embodiment, the cutter installed on cutter disc body 1 has four center double gear cutters 4, thirty-eight welded tear cutters 5, sixty-three replaceable tear cutters 6, one hundred fifty-four front scrapers 7 and sixteen group edge scrapers 8. Among them, the four center double gear cutters 4 are arranged at the center position of cutter disc body 1, the four center double gear cutters 4 are distributed in a radial manner with the center of cutter disc body 1, each center double gear cutter 4 comprises a center cutter seat 41, the center cutter seat 41 is fixed on cutter disc body 1 through a bolt assembly, a first gear cutter 42 and a second gear cutter 43 are sequentially installed on the center cutter seat 41 from inside to outside through the bolt assembly, the vertex of the first gear cutter is higher than that of the second gear cutter, and the design is favorable for cutter disc centering and improving the stability, and can fully adapt to the shield tunneling of clay-calcareous nodule mixed stratum.

[0027] The welded tear knives 5 are fixed on each main arm spoke 2 by welding, and the replaceable tear knives 6 are fixed on the auxiliary arm spoke 3 by bolting. A plurality of welded tear knives 5 are fixed on the main arm spoke 2 by welding. In this embodiment, the blade spacing of the center double teeth is 100 mm, and the blade spacing of the welded tear knives 5 is 100-200 mm, thereby ensuring the shield effect. A plurality of replaceable tear knives 6 are fixed on the auxiliary arm spoke 3 by bolting. When the wear is serious, the replaceable tear knives 6 can be directly replaced without entering the warehouse, thereby ensuring the normal use of the shield. The group edge scraper 8 is arranged on the edge of the cutter head body 1, and the front scraper 7 is arranged on the main arm spoke 2, thereby ensuring that the scrapers fully cover the tunnel face.

[0028] Through the design of the composite pressure cutter head for the complex stratum with a large number of calcareous nodule in silty clay, the welded tear knives 5 and the front scraper 7 are arranged on the main arm spoke 2, the replaceable tear knives 6 are arranged on the auxiliary arm spoke 3, and the group edge scraper 8 is arranged on the edge of the cutter head body 1, so that most of the cutters are concentrated on the main arm spoke 2, the auxiliary arm spoke 3 and the edge, and the opening design and cutter arrangement of the cutter head are comprehensively optimized. Through accurate calculation and simulation test, a more reasonable opening structure is designed to ensure that the slurry can be smoothly discharged and the formation of slurry cake and mud cake is avoided, thereby significantly improving the tunneling efficiency. In addition, the optimized cutter arrangement further enhances the cutting capacity of the cutter head, so that the tunneling of the shield machine in soft soil and clay stratum is more stable and efficient.

Claims

1. A composite pressure cutterhead for silty clay mixed with a large number of calcareous nodules in complex strata, comprising a cutterhead body, characterized in that: The front of the cutter head body is provided with a plurality of main arm spokes, the plurality of main arm spokes are radially distributed from the center of the cutter head body, and an auxiliary arm spoke is provided between two adjacent main arm spokes; A plurality of center double-toothed cutters are provided at the center of the cutter disc body, and the plurality of center double-toothed cutters are radially distributed from the center of the cutter disc body. Each center double-toothed cutter includes a center cutter seat, and the center cutter seat is fixed to the cutter disc body. A first cutter and a second cutter are sequentially mounted on the center cutter seat from the inside to the outside through a bolt assembly, and the vertex of the first cutter is higher than the vertex of the second cutter. A plurality of welded tearing knives are fixed on the spokes of the main arm by welding, and a plurality of replaceable tearing knives are fixed on the spokes of the auxiliary arm by bolt connection; The edge of the cutter disc body is provided with a plurality of side scrapers, and the main arm spokes are also provided with a plurality of front scrapers.

2. The composite pressure cutterhead for silty clay mixed with a large number of calcareous nodules in complex strata according to claim 1, characterized in that: The number of the main arm spokes is eight, and the number of the central double-toothed cutters is four.

3. The composite pressure cutterhead for silty clay mixed with a large number of calcareous nodules in complex strata according to claim 1, characterized in that: The blade spacing of the central double teeth is 100 mm, and the blade spacing of the welded tearing knife is 100-200 mm.

4. The composite pressure cutterhead for silty clay mixed with a large number of calcareous nodules in complex strata according to claim 2, characterized in that: The blade of the welded tearing knife is an alloy sharp-angled blade.

5. The composite pressure cutterhead for silty clay mixed with a large number of calcareous nodules in complex strata according to any one of claims 1 to 4, characterized in that: The number of welded tearing knives is 38, the number of replaceable tearing knives is 63, the number of front scrapers is 154, and the number of edge scrapers is 16.

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