A shield machine cutterhead capable of reinforcing the surrounding stratum of a tunneling contour line

Abstract

The utility model discloses a reinforced shield machine cutterhead of tunnelling contour line peripheral stratum, this shield machine cutterhead includes cutterhead, high pressure nozzle, grouting pipe and grouting pump, and the cutterhead includes ring beam, amplitude arm and flange plate, and the amplitude arm is fixed evenly on the flange plate with interval, and the middle part and the end of amplitude arm are connected through ring beam, and the cutter is installed on the cutterhead, and the outer edge surface of the outermost ring beam is provided with mounting hole, and the high pressure nozzle is installed in the mounting hole, and the grouting pump is installed on the shield machine trolley. The utility model improves the structure on the cutterhead, and the mounting hole is arranged on it, and the high pressure nozzle is installed in the mounting hole, and the high pressure cement slurry is injected into the nozzle through the grouting pump through the grouting pipe, and the high pressure cement slurry that sprays cuts and stirs the stratum outside tunnelling contour and mixes with the soil, forms the mixture of cement and soil, and the mixture forms the cement soil with certain intensity after several days, plays the supporting and water -resisting effect when excavating the butt joint section, prevents stratum collapse and muddy water from gushing into the tunnel.

Description

Technical Field

[0001] This utility model relates to the technical field of shield tunneling equipment, and more specifically, to a shield machine cutterhead that can reinforce the strata surrounding the tunneling outline. Background Technology

[0002] With the continuous development of national construction, more and more tunnels are being constructed using the shield tunneling method, and their lengths are getting longer and longer. Some projects have had to use shield docking to achieve tunnel breakthrough. In addition, for tunnels that cannot continue to be excavated due to shield machine failure, it may be necessary to manufacture another shield machine to excavate in the opposite direction and dock with it.

[0003] Currently, the main methods for reinforcing the ground layer of shield tunnels are grouting through pre-reserved radial holes on the shield body, grouting and filling of slurry chambers and air bubbles, and freezing to reinforce the strata around the shield body. These reinforcement measures have the following problems: (1) Grouting through radial holes on the shield shell has limited grouting points, poor grout diffusion, uneven reinforcement of the strata, insufficient reinforcement of the joint area, poor reinforcement strength of the strata, and cannot form a solid layer around the excavation face that can both waterproof and resist water and soil pressure; (2) The grout diffusion range is small, and it cannot form a solid layer of large thickness around the joint excavation face; (3) Freezing reinforcement requires drilling or pre-reserving holes in the shield body and installing freezing pipes, which has high construction risk, low efficiency, large investment, and long construction period; (4) Grouting through air bubbles and slurry chambers can only reinforce the working face, slurry chamber and air bubble chamber area, and cannot reinforce the strata around the cutterhead.

[0004] In addition, the uniformity of grouting around the cutterhead directly affects the quality of the reinforced strata. The better the quality of the strata reinforcement, the safer the segmental excavation construction. Utility Model Content

[0005] This utility model provides a shield machine cutterhead that can reinforce the strata around the tunneling outline, in order to solve the problems of poor reinforcement effect and weak reinforcement strength in existing shield machine grounding layer reinforcement methods, which are difficult to meet actual needs.

[0006] According to one aspect of this utility model, a shield machine cutterhead is provided for reinforcing the strata surrounding the tunneling outline, used to reinforce the strata in the shield docking section. The shield machine cutterhead includes a cutterhead, a high-pressure nozzle, a grouting pipe, and a grouting pump. The cutterhead includes a ring beam, booms, and a flange. The booms are evenly fixed to the flange at intervals. The middle and end portions of the booms are connected by the ring beam, and cutters are mounted on the cutterhead. The outermost ring beam has mounting holes on its outer edge surface. The high-pressure nozzle is installed in the mounting holes. The grouting pump is mounted on the shield machine trolley and is connected to the high-pressure nozzle through the grouting pipe. Cutters are also mounted on the cutterhead.

[0007] Based on the above scheme, preferably, the angle between the high-pressure nozzle and the central axis of the cutterhead is set at an acute angle, and the high-pressure nozzle is inclined in the direction of tunneling.

[0008] Preferably, based on the above scheme, there are multiple high-pressure nozzles, and the high-pressure nozzles are evenly spaced on the outer edge surface of the outermost ring beam; the cutting tool is provided with mounting holes, and the high-pressure nozzles are evenly spaced on the mounting holes of the cutting tool.

[0009] Based on the above scheme, the preferred feature is that the arm is hollow and the grouting pipe is installed inside the arm.

[0010] Based on the above scheme, a check valve is preferably provided on the grouting pipe.

[0011] Based on the above scheme, the high-pressure nozzle is preferably provided with a protective cover that can be opened by pressure of 2MPa or higher.

[0012] Based on the above scheme, the preferred option is that the grouting pipe is a wear-resistant pipe.

[0013] This invention relates to a tunnel boring machine cutterhead that can reinforce the strata surrounding the tunneling outline. By improving the cutterhead structure and incorporating mounting holes with high-pressure nozzles, high-pressure cement slurry is injected into the nozzles via a grouting pump and grouting pipes during tunneling. The injected high-pressure cement slurry cuts and mixes the strata outside the tunneling outline, combining with the cut-off soil to form a cement-soil mixture. After several days, this mixture develops into a cement-soil structure with a certain strength, providing support and water barrier during the excavation of connecting sections, preventing ground collapse and the influx of mud and water into the tunnel. In rock strata, the injected high-pressure cement slurry fills rock fissures and solidifies with the rock, preventing water from entering the tunnel through these fissures.

[0014] Compared with existing technologies, the shield machine cutterhead of this utility model, which can reinforce the strata around the tunneling outline, is an integral part of the shield machine during its manufacturing process. It can not only improve the strength and uniformity of the reinforced strata, but also reinforce the strata in a specific area and at a specific depth. The reinforcement of the strata in the tunneling section can be completed simultaneously with the excavation of the shield docking section. It is convenient to operate, significantly reduces the construction period and cost, and increases the tunneling length. Compared with the existing construction methods for reinforcing the strata in the shield docking section, it is safer and more reliable. Attached Figure Description

[0015] To more clearly illustrate the technical solutions implemented in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort. In the drawings:

[0016] Figure 1 This is a schematic diagram of the shield machine cutterhead that can reinforce the strata surrounding the tunneling outline according to this utility model.

[0017] Figure 2 This is a cross-sectional view (AA) of the tunnel boring machine cutterhead that can reinforce the strata surrounding the tunneling outline according to this utility model.

[0018] Explanation of icon numbers:

[0019] 1. Cutterhead; 3. Cutting tool; 11. Flange; 12. Arm; 13. Ring beam; 15. Mounting hole; 2. High-pressure nozzle; 4. Grouting pipe. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0021] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of a descriptive feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets.

[0022] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0023] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0024] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various components of this invention are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0025] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0027] Please see Figure 1 and combined Figure 2 As shown, this utility model discloses a shield machine cutterhead that can reinforce the strata around the tunneling outline, used to reinforce the strata in the shield docking section. Specifically, the shield machine cutterhead that can reinforce the strata around the tunneling outline includes a cutterhead 1, a high-pressure nozzle 2, and a grouting pump. The cutterhead 1 includes a beam ring 13, a flange 11, and a boom 12. The booms 12 are evenly spaced on the flange 11. The ends and middle parts of the booms 12 are connected by the ring beam 13, that is, the ring beam 13 and the flange 11 are coaxially arranged. This structure is prior art, so it will not be described in detail here.

[0028] When the cutter head rotates, the cutter on the cutter head 1 cuts the strata to form a tubular tunnel structure, and then the inner edge of the tubular structure is flattened by the surface of the ring beam 13.

[0029] This utility model has an installation hole 15 on the outermost ring beam 13, a high-pressure nozzle 2 installed in the installation hole 15, and a grouting pump installed on the shield machine trolley. The grouting pump is connected to the high-pressure nozzle 2 through the grouting pipe 4.

[0030] In another preferred embodiment of the present invention, the present invention has a mounting hole 15 on the cutting tool 3, a high-pressure nozzle 2 installed in the mounting hole 15, a grouting pump installed on the shield machine trolley, and the grouting pump connected to the high-pressure nozzle 2 through the grouting pipe 4.

[0031] In the design of the tunnel boring machine, in order to ensure the uniformity of jet grouting to the surrounding strata and to ensure that the reaction force generated by the grout spray does not produce an eccentric force on the cutterhead, this utility model has several mounting holes 15 machined on the outer ring of the ring beam 13 of the cutterhead 1 or on the cutting tools. The outlet of the mounting hole 15 is exposed on the outer periphery of the cutterhead 1, and the high-pressure nozzle 2 is installed in the mounting hole 15. The mounting holes are symmetrically arranged around the cutterhead.

[0032] To protect the high-pressure nozzle 2, this invention also covers the exposed part of the high-pressure nozzle 2 with a protective cap and / or fills the high-pressure nozzle 2 with a paste-like grease or similar substance, which can prevent mud and water from entering the nozzle and can be flushed out under high pressure. When the internal slurry pressure of the high-pressure nozzle 2 is greater than 2 MPa, the protective cap will open under the force of the slurry pressure, and when the internal slurry pressure of the high-pressure nozzle 2 is greater than 2 MPa, the paste-like grease will penetrate under the force of the slurry pressure.

[0033] During use, the high-pressure nozzle 2 is connected to the grouting pipe 4, and a check valve is installed on the grouting pipe 4 to prevent mud and water in the stratum from entering the tunnel boring machine through the pipeline. The outer surface of the grouting pipe 4 is made of wear-resistant alloy to prevent it from being worn through.

[0034] Grouting pipe 4 extends through cutterhead 1 to the tunnel boring machine trolley. When not in use, part of the grouting pipe is removed from the position where it extends out of the main tunnel boring machine and the grouting pipe 4 leading to the cutterhead is blocked with a plug.

[0035] The high-pressure nozzle 2 and the grouting pipe shall be single-layer, double-layer or triple-layer pipes used in high-pressure jet grouting pile construction as needed.

[0036] During operation, as the cutterhead 1 rotates and excavates, high-pressure cement grout is injected into the nozzles via the grouting pump and grouting pipe 4. The injected high-pressure cement grout cuts and mixes the strata outside the newly formed cylindrical excavation face, mixing with the cut-off soil to form a cement-soil mixture. After several days, this mixture forms a cement-soil mixture with a certain strength, which serves as support and water barrier during the excavation of the connecting section, preventing strata collapse and mud-water inflow into the tunnel. For rock strata, the injected high-pressure cement grout fills rock fissures and solidifies with the rock, preventing water from entering the tunnel through the fissures.

[0037] In order to reinforce the cutterheads of the two tunnel boring machines and the surrounding strata, this invention also sets the angle between the high-pressure nozzle 2 and the central axis of the cutterhead 1 to be an acute angle, so that the cement slurry is sprayed obliquely outward in the direction of tunneling and radial direction.

[0038] Preferably, the high-pressure nozzles 2 are evenly spaced on the outer edge of the cutterhead, so that they can evenly spray high-pressure cement slurry outside the tunneling outline to achieve uniform reinforcement.

[0039] This utility model also provides a construction method for reinforcing the ground strata in the shield tunnel docking section, which uses the device described in any of the above claims for construction, and includes the following steps:

[0040] Step 1: Control the shield machine cutterhead 1 to rotate and advance, and excavate the strata;

[0041] Step 2: When the cutterhead rotates and advances, control the grouting pump to work and spray high-pressure grout through the high-pressure nozzle 2 to the outer side of the front of the annular tunnel formed by the cutterhead excavation. By rotating the cutterhead 1, the grout sprays form an annular reinforcement ring on the surface of the annular tunnel formed by excavation.

[0042] Preferably, the injection pressure of the high-pressure grout in step 2 is above 20 MPa; the matching of the tunnel boring machine's advance speed and the cutterhead rotation speed must ensure that the high-pressure grout continuously cuts the surrounding strata in the tunneling direction. During grouting, the tunnel boring machine's advance speed should be slow, the cutterhead rotation speed should be slow, and the grouting pressure should be able to reach above 20 MPa to ensure that the surrounding strata can be cut to a sufficient depth and that the cut strata are continuous, forming a thicker annular reinforcement ring.

[0043] During use, appropriate tunneling speeds, rotation speeds, and grouting pressures are adopted based on the properties of the strata in the connecting section to ensure that the grout effectively reinforces the strata in that area. Before construction, the tunnel boring machine's advance speed, cutterhead rotation speed, and grouting pressure for the reinforced section are tested on strata with similar geological conditions to achieve the required reinforcement thickness.

[0044] When the tunnel boring machine reaches the section where ground reinforcement is needed, the shotcrete equipment is turned on. By controlling construction parameters such as tunneling speed, cutterhead rotation speed, and shotcrete pressure, the uniformity of shotcrete and the depth of ground reinforcement are controlled.

[0045] This invention relates to a tunnel boring machine cutterhead 1 capable of reinforcing the strata surrounding the excavation outline. By improving the cutterhead structure, mounting holes 15 are provided, each containing a high-pressure nozzle 2. During the cutterhead's rotation and excavation, high-pressure cement slurry is injected into the nozzles via a grouting pump and grouting pipe 4. This high-pressure cement slurry cuts and mixes with the excavated soil around the outline, forming a cement-soil mixture. After several days, this mixture develops into a cement-soil structure with a certain strength, providing support and preventing water ingress during the excavation of connecting sections, thus preventing ground collapse and the influx of mud and water into the tunnel. In rock formations, the injected high-pressure cement slurry fills rock fissures and solidifies with the rock, preventing water from entering the tunnel through these fissures.

[0046] Compared with existing technologies, the shield machine cutterhead 1 of this utility model, which can reinforce the strata around the tunnel outline, is an integral part of the shield machine during the manufacturing process. It can not only improve the uniformity of the reinforced strata, but also reinforce the strata in a specific area, quantity, and depth, effectively improving the quality of the reinforced strata. It is easy to operate, significantly reduces the construction period and cost, and can realize a revolution in long-distance shield tunneling. Compared with the existing construction methods for reinforcing the strata in the shield docking section, it is safer and more reliable.

[0047] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cutterhead of a shield machine for reinforcing a ground formation around a tunneling profile line, for reinforcing a ground formation of a shield joint section, characterized in that, The tunnel boring machine cutterhead includes a cutterhead, a high-pressure nozzle, a grouting pipe, and a grouting pump. The cutterhead includes a ring beam, booms, and a flange. The booms are evenly fixed to the flange at intervals. The middle and end parts of the booms are connected by the ring beam, and cutters are mounted on the cutterhead. The outermost edge of the ring beam has mounting holes, and the high-pressure nozzle is installed in the mounting holes. The grouting pump is mounted on the tunnel boring machine trolley and is connected to the high-pressure nozzle through the grouting pipe.

2. A cutterhead for a shield machine that can reinforce a tunneling profile perimeter ground formation as claimed in claim 1, characterized in that, The high-pressure nozzle is set at an acute angle with the central axis of the cutterhead, and the high-pressure nozzle is inclined in the direction of tunneling.

3. A shield machine cutterhead capable of reinforcing the profile of the perimeter ground formation as claimed in claim 1, characterized in that, There are multiple high-pressure nozzles, and the high-pressure nozzles are evenly spaced on the outer edge surface of the outermost ring beam; the cutting tool is provided with mounting holes, and the high-pressure nozzles are evenly spaced in the mounting holes of the cutting tool.

4. The shield tunneling machine cutterhead as described in claim 1, characterized in that, The arm is hollow, and the grouting pipe is installed inside the arm.

5. A tunnel boring machine cutterhead capable of reinforcing the profile of the perimeter ground formation as claimed in claim 4, characterised in that, A check valve is installed on the grouting pipe.

6. A cutterhead for a shield machine that can reinforce a tunneling profile perimeter ground formation as claimed in claim 4, characterized in that, The high-pressure nozzle is equipped with a protective cover.

7. A cutterhead for a shield machine that can reinforce a tunneling profile perimeter ground formation as claimed in claim 4, characterized in that, The high-pressure nozzle is filled with a paste-like grease.

8. A tunnel boring machine cutterhead capable of reinforcing the profile of the perimeter ground formation as claimed in claim 4, characterised in that, The grouting pipe is a wear-resistant pipe.

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