A method for determining and configuring the inter-shield cutter spacing of a shield cutter

Abstract

The application provides a shield cutter tool interval determination and gradient configuration method. The tool interval determination method can determine the tool interval of a shield cutter through stratum parameters and selected cutter blade width. The gradient configuration method comprises: a cutter, a tearing cutter and a scraping cutter, the tearing cutter is arranged between two adjacent cutters, the scraping cutter is arranged on the same track as the cutter and the tearing cutter, the height order of the three cutters is cutter > tearing cutter > scraping cutter, and the height difference between the three is 20mm-50mm according to stratum difference. The cutter is a large-blade-width and round-blade-angle cutter, the blade width is 25-30mm, and the curvature radius of the blade angle is 10-15mm. The tearing cutter is characterized in that the rake angle is negative and the relief angle is 0. The device can effectively improve the tunneling efficiency of the shield in the composite stratum, reduce the number of shield cutters to a certain extent, avoid abnormal wear of the cutter head, and provide a reasonable solution for the configuration of the composite shield cutter.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel cutterhead configuration technology, and in particular to a method for determining the cutter spacing and tiered configuration of shield tunnel cutters. Background Technology

[0002] With the increasing development of underground engineering in my country, the construction of shield tunnels is gradually increasing, and the encounter with complex strata of alternating hard and soft textures during shield tunneling is becoming more and more frequent. When tunneling in these complex strata, improper cutter configuration leads to frequent problems such as cutter damage, cutterhead clogging causing uneven wear, and even cutterhead damage. This results in frequent shield machine shutdowns, increasing construction time and costs, as well as project risks, significantly impacting the safety and efficiency of shield tunnel construction. How to rationally configure the cutterhead to improve tunneling efficiency and reduce damage to the cutterhead and cutterhead is one of the most pressing problems to be solved in the field of shield tunneling technology.

[0003] Currently, the cutterhead configuration for shield tunneling is insufficient to meet the actual engineering needs of shield tunneling in complex strata with alternating soft and hard surfaces. Therefore, in order to improve shield tunneling efficiency, reduce cutterhead and shield cutterhead damage, and better meet the requirements of shield tunneling in complex strata with alternating soft and hard surfaces, it is necessary to develop a tiered cutterhead configuration structure for complex strata. Summary of the Invention

[0004] The embodiments of the present invention provide a method for determining the spacing between shield cutters and for tiered configuration, so as to effectively provide a composite shield cutter.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A method for determining the spacing between shield tunnel cutters and configuring them in a tiered manner, wherein the shield tunnel cutters include roller cutters, and the configuration of various rock-breaking parameters of the roller cutters includes:

[0007]

[0008] In the formula, L is the distance between the rock-breaking points of the cutter, R is the radius of the cutter, and h is the penetration depth;

[0009]

[0010] L i For a penetration depth of h i The distance between the rock-breaking points of the roller cutter is i = 1, 2, 3…20;

[0011] h i The penetration depth of the hobbing cutter is The position of mm, i = 1, 2, 3…20;

[0012] The rotation radius of the first hob:

[0013]

[0014] In the formula, ρ1 is the innermost hob rotation radius, and ω is the hob cutting edge width. For rock fracture angle;

[0015] Substituting formula (3) into the equation, we can obtain the outermost contact diameter between the first cutting cutter and the soil / rock mass:

[0016]

[0017] In the formula, ξ1 is the outer diameter of the innermost cutter contacting the rock and soil when the penetration is h, and i = 1, 2, 3…20;

[0018] At a penetration depth of h i Contact outer diameter at time:

[0019]

[0020] In the formula ξ 1i For a penetration depth of h i The contact outer diameter at time i = 1, 2, 3…20

[0021] The innermost hob has a penetration depth of h. i Width of the rock-breaking profile on the outer side of the cutter ring:

[0022]

[0023] In the formula l 1i The first hob has a penetration depth of h. i The width of the outer rock-breaking section, i = 1, 2, 3…20;

[0024] The rock-breaking outer diameter of the first hobbing cutter is:

[0025]

[0026]

[0027] In the formula, τ1 is the outer diameter of the innermost cutting cutter, l 1i For the first hob, at a penetration depth of h i Width of the rock-breaking section on the outer side of the cutter ring;

[0028] The rotation radius of the nth hob:

[0029]

[0030] In the formula ρ n Let τ be the radius of rotation of the nth hob. n-1 Let be the rock-breaking outer diameter of the (n-1)th hobbing cutter;

[0031] The outer contact diameter of the nth hob:

[0032]

[0033] The nth hob has a penetration depth of h. i Contact outer diameter at time:

[0034]

[0035] The nth hob has a penetration depth of h. i Width of the rock-breaking profile outside the cutter ring:

[0036]

[0037] The rock-breaking outer diameter of the nth hobbing cutter:

[0038]

[0039] In the formula, τ n Let l be the rock-breaking outer diameter of the nth hobbing cutter. ni For the nth hob, at a penetration depth of h i The width of the rock-breaking profile outside the blade ring.

[0040] Preferably, the shield cutting tools further include a tearing cutter and a scraper. The tearing cutter is disposed between two adjacent roller cutters, and the scraper is disposed on the same trajectory as the roller cutter and the tearing cutter. The height order of the three cutter tips is roller cutter > tearing cutter > scraper, and the height difference between the three is between 20mm and 50mm depending on the geological strata.

[0041] The cutter is used to break up hard rock in hard rock strata or complex strata.

[0042] The tearing blade is used to assist in breaking the remaining rock ridges in hard rock strata or hard rock strata with alternating soft and hard rock after the action of the rolling cutter.

[0043] The scraper is used to cut soft soil layers and soft soil portions in composite strata, and to assist in the stripping, diversion, collection, mixing, and packing of broken rock blocks and debris into storage.

[0044] Preferably, the hob is a wide-bladed, round-bladed hob with a blade width of 25-30mm and a blade angle radius of curvature of 10-15mm. The tearing blade is characterized by a negative front angle and a zero rear angle.

[0045] As can be seen from the technical solutions provided by the embodiments of the present invention above, the device of the present invention can effectively improve the tunneling efficiency of shield tunneling in composite strata, reduce the number of shield cutters to a certain extent, avoid abnormal wear of the cutterhead, and provide a reasonable solution for the configuration of composite shield cutters.

[0046] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This diagram illustrates the implementation principle of a method for determining the spacing and tiered configuration of shield tunneling cutters in complex soft-hard strata, as provided in an embodiment of the present invention. The numbers in the diagram represent: 1-rolling cutter, 2-scraper, 3-tearing cutter, 4-stratum, 5-rock ridge. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0050] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or couplings. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0051] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0052] To facilitate understanding of the embodiments of the present invention, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0053] The implementation principle diagram of a method for determining the cutter spacing and tiered configuration of shield tunneling cutters in soft-hard interactive composite strata provided by this invention is shown in the figure below. Figure 1 As shown, the aforementioned tunnel boring machine (TBM) cutters include: rolling cutters, tearing cutters, and scrapers. The order of the cutter tip heights of the three cutters is rolling cutter > tearing cutter > scraper, and the height difference between the three varies from 20mm to 50mm depending on the geological formation.

[0054] Roller cutters are used to break up hard rock in hard rock formations or complex formations, protecting the ripping cutter and scraper.

[0055] The tearing blade is positioned between two adjacent roller cutters to assist in breaking the remaining rock ridges in hard rock strata or hard rock strata with alternating soft and hard rock after the action of the roller cutters, thus preventing the rock ridges from damaging the scraper and cutter head.

[0056] The scraper is positioned on the same trajectory as the roller cutter and the tearing cutter. It is used to cut soft soil layers and soft soil portions in composite strata, and to assist in the stripping, diversion, collection, mixing, and packing of broken rock blocks and debris into storage.

[0057] The cutter ring of the hob is made of high-strength alloy steel, and its parameters can be changed according to the formation conditions. The cutting width varies from 17mm to 30mm, and the cutter ring type is mainly a flat-edged hob or a toothed hob.

[0058] The tearing blades are all made of high-strength alloy steel, and the cutting angle is selected as either an angled cutting angle or an arc-shaped cutting angle.

[0059] The scraper is made of high-toughness alloy steel to enhance its impact resistance.

[0060] The method for configuring various rock-breaking parameters of the roller cutter in the soft-hard interactive composite formation cutter tiered configuration device of this invention includes:

[0061]

[0062] In the formula, L is the distance between the rock-breaking points of the cutter, R is the radius of the cutter, and h is the penetration depth.

[0063]

[0064] In the formula L i For a penetration depth of h i The distance between the points where the rock breaks, i = 1, 2, 3…20.

[0065] h iThe penetration depth of the hobbing cutter is The position of mm, i = 1, 2, 3…20.

[0066] The rotation radius of the first hob:

[0067]

[0068] In the formula, ρ1 is the innermost hob rotation radius, and ω is the hob cutting edge width. The rock fracture angle.

[0069] Substituting formula (3) into the equation, we can obtain the outermost contact diameter between the first cutting cutter and the soil / rock mass:

[0070]

[0071] In the formula, ξ1 is the outer diameter of the innermost cutter contacting the soil and rock when the penetration is h, and i = 1, 2, 3…20.

[0072] At a penetration depth of h i Contact outer diameter at time:

[0073]

[0074] In the formula ξ 1i For a penetration depth of h i The contact outer diameter at time i = 1, 2, 3…20

[0075] The innermost hob has a penetration depth of h. i Width of the rock-breaking profile on the outer side of the cutter ring:

[0076]

[0077] In the formula l 1i The first hob has a penetration depth of h. i Width of the outer rock-breaking section, i = 1, 2, 3…20

[0078] The rock-breaking outer diameter of the first hobbing cutter is:

[0079]

[0080]

[0081] In the formula, τ1 is the outer diameter of the innermost cutting cutter, l 1i For the first hob, at a penetration depth of h i Width of the rock-breaking section outside the blade ring.

[0082] The rotation radius of the nth hob:

[0083]

[0084] In the formula ρ n Let τ be the radius of rotation of the nth hob. n-1 Let be the rock-breaking outer diameter of the (n-1)th cutter.

[0085] The outer contact diameter of the nth hob:

[0086]

[0087] The nth hob has a penetration depth of h. i Contact outer diameter at time:

[0088]

[0089] The nth hob has a penetration depth of h. i Width of the rock-breaking profile outside the cutter ring:

[0090]

[0091] The rock-breaking outer diameter of the nth hobbing cutter:

[0092]

[0093] In the formula, τ n Let l be the rock-breaking outer diameter of the nth hobbing cutter. ni For the nth hob, at a penetration depth of h i The width of the rock-breaking profile outside the blade ring.

[0094] In summary, the device of the present invention can effectively improve the tunneling efficiency of shield tunneling in composite strata, reduce the number of shield cutters to a certain extent, avoid abnormal wear of the cutterhead, and provide a reasonable solution for the configuration of composite shield cutters.

[0095] This invention provides a method for configuring the cutterheads of a tunnel boring machine (TBM) in a tiered manner and for determining the cutterhead spacing in complex strata with alternating soft and hard surfaces. Applying this method enables the scientific configuration of the TBM cutterheads and effectively improves the tunneling efficiency of the TBM in complex strata with alternating soft and hard surfaces.

[0096] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0097] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for apparatus or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments. The apparatus and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0098] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for determining the spacing between shield tunneling cutters and for tiered configuration, characterized in that, The shield cutting tools include roller cutters, and the configuration of various rock-breaking parameters of the roller cutters includes: In the formula, The distance between the rock-breaking points of the rolling cutter is the distance between the points where the cutting cutter breaks the rock. Where is the hob radius, Penetration degree; For the penetration depth is The distance between the rock-breaking points of the roller cutter. ; The penetration depth of the hobbing cutter is The rotation radius of the first hob: In the formula The innermost hob's rotation radius. For the width of the hobbing cutter blade, For rock fracture angle; Substituting formula (3) into the equation, we can obtain the outermost contact diameter between the first cutting cutter and the soil / rock mass: In the formula For penetration degree The outer diameter of the innermost cutter in contact with the rock and soil mass. ; At a penetration depth of Contact outer diameter at time: In the formula For the penetration depth is The outer diameter of the contact at that time The innermost hob has a penetration depth of Width of the rock-breaking profile on the outer side of the cutter ring: In the formula The first hob has a penetration depth of... Width of the outer rock-breaking section, ; The rock-breaking outer diameter of the first hobbing cutter is: In the formula, The outer diameter of the innermost cutting cutter in rock breaking. For the first hob, at a penetration depth of Rock breaking section width outside the cutter ring The rotation radius of the nth hob: In the formula Let n be the radius of rotation of the nth hob. The rock-breaking outer diameter of the (n-1)th hobbing cutter The outer contact diameter of the nth hob: The nth hob has a penetration depth of... Contact outer diameter at time: The nth hob has a penetration depth of... Width of the rock-breaking profile outside the cutter ring: The rock-breaking outer diameter of the nth hobbing cutter: In the formula, Let n be the rock-breaking outer diameter of the nth hobbing cutter. For the nth hob, at a penetration depth of... Width of the rock-breaking profile outside the blade ring; The shield cutting tools also include a tearing cutter and a scraper. The tearing cutter is positioned between two adjacent roller cutters, and the scraper is positioned on the same trajectory as the roller cutter and the tearing cutter. The order of the tip height of the three types of cutters is roller cutter > tearing cutter > scraper, and the height difference between the three is between 20mm and 50mm depending on the geological strata. The cutter is used to break up hard rock in hard rock strata or complex strata. The tearing blade is used to assist in breaking the remaining rock ridges in hard rock strata or hard rock strata with alternating soft and hard rock after the action of the rolling cutter. The scraper is used to cut soft soil layers and soft soil portions in composite strata, and to assist in the stripping, diversion, collection, mixing, and packing of broken rock blocks and debris into storage.

2. The method according to claim 1, characterized in that, The hob is a wide-bladed, round-bladed hob with a blade width of 25-30mm and a blade angle radius of curvature of 10-15mm. The tearing blade is characterized by a negative front angle and a zero back angle.

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