Head lowering prevention device for shield tunneling machine entering and exiting hole

Abstract

The utility model provides an anti-head-lowering device for a shield tunneling machine entering and exiting a hole, which comprises a bracket, an anti-head-lowering device and an anti-head-lowering device, the supporting piece is connected between the bracket and the head-lowering-preventing component and arranged at the end, close to the tunnel portal, of the bracket in the transverse direction. The two head lowering prevention components are symmetrically arranged on the two sides of the bottom of the tunnel portal steel ring, connected with the tunnel portal steel ring and used for supporting the shield tunneling machine and preventing the head falling phenomenon of the shield tunneling machine; the top of the head-lowering-preventing component is flush with the top of the bracket, and the head-lowering-preventing component is provided with an inclined face used for being matched with a cutter head of the shield tunneling machine so as to guide the shield tunneling machine to enter and exit from the tunnel portal. The two anti-head-lowering components are symmetrically arranged on the two sides of the bottom of the tunnel portal steel ring, and the anti-head-lowering components are flush with the top of the bracket, so that the phenomenon of head falling (namely front end sinking) when the shield tunneling machine enters and exits from the tunnel portal can be effectively avoided, the shield tunneling machine can stably enter and exit from the tunnel portal, and the working efficiency of the shield tunneling machine is improved. And the safety risk of shield launching and receiving in shield tunneling machine construction is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering technology, and more specifically, to a device for preventing tunnel boring machines from tilting down when entering and exiting tunnels. Background Technology

[0002] As a new type of underground transportation, urban subway track engineering utilizes the shield tunneling method, which is currently one of the most commonly used and effective methods. Conventional shield tunneling begins when the shield moves forward from its support frame, passing through the supporting shaft's retaining structure to commence formal excavation. In this process, the presence of trenches, end walls, and retaining piles (manually removed before entering and exiting the tunnel) results in a relatively large gap between the support frame and the tunnel face (greater than the distance between the shield's center of gravity and the foremost point of the cutterhead). As the shield moves forward, the front of the shield gradually becomes suspended in the air. When the shield's center of gravity begins to detach from the support frame, the shield will exhibit a nose-down phenomenon. Furthermore, after the shield enters the soil, the change in the load-bearing structure (front: soil, rear: hardened concrete surface) exacerbates the nose-down tendency, hindering normal excavation. In conventional tunnel boring machines (TBMs), the TBM is pushed forward through the receiving shaft retaining structure before being hoisted onto the support frame for dismantling. However, this process can result in a large distance between the receiving support frame and the tunnel face. During the process of hoisting the TBM onto the support frame, the TBM often tilts its head down, and the receiving support frame is higher than the bottom of the cutterhead, preventing the TBM from being hoisted onto the support frame properly and hindering the successful receipt of the TBM. Summary of the Invention

[0003] In view of this, this utility model proposes a device to prevent shield tunneling machines from tilting down when entering and exiting tunnels, which aims to solve the problem that existing shield tunneling machines are prone to tilting down when entering and exiting tunnels, thus preventing normal tunneling.

[0004] This utility model proposes a device to prevent a tunnel boring machine from tilting down when entering and exiting the tunnel, comprising:

[0005] Brackets are used to support tunnel boring machines;

[0006] A support member is connected between the bracket and the anti-head-down component, and is arranged laterally at the end of the bracket near the tunnel entrance;

[0007] Two anti-head-down components are symmetrically arranged on both sides of the bottom of the tunnel portal steel ring and connected to the portal steel ring to support the tunnel boring machine and prevent it from head-down.

[0008] The top of the anti-head-down component is flush with the top of the bracket, and the anti-head-down component has an inclined surface to cooperate with the cutterhead of the tunnel boring machine to guide the tunnel boring machine in and out of the tunnel entrance.

[0009] Further, in the shield tunneling machine hole entry and exit anti-bowing device, the slope of the anti-bowing member and the slope angle of the horizontal plane where the bracket is located is 20-60°.

[0010] Further, in the shield tunneling machine hole entry and exit anti-bowing device, the slope of the anti-bowing member and the slope angle of the horizontal plane where the bracket is located is 20°.

[0011] Further, in the shield tunneling machine hole entry and exit anti-bowing device, the anti-bowing member comprises a base, a guide part and a supporting part which are connected, wherein,

[0012] The guide part and the supporting part are arranged on the base;

[0013] The guide part has a slope, and the supporting part is connected to the end of the guide part away from the slope;

[0014] The end of the slope of the guide part close to the base has a height difference with the base.

[0015] Further, in the shield tunneling machine hole entry and exit anti-bowing device, the slope and the top plate of the supporting part are connected by a rotating shaft to adjust the inclination angle of the slope.

[0016] Further, in the shield tunneling machine hole entry and exit anti-bowing device, a plurality of reinforcing ribs are arranged in the vertical direction at the connection between the guide part and the supporting part.

[0017] Further, in the shield tunneling machine hole entry and exit anti-bowing device, a wear-resistant coating is arranged on the slope and the top plate of the supporting part.

[0018] Further, in the shield tunneling machine hole entry and exit anti-bowing device, the base of the anti-bowing member is bolted or welded to the tunnel portal steel ring.

[0019] Further, in the shield tunneling machine hole entry and exit anti-bowing device, the anti-bowing member is made of a 43 type steel rail.

[0020] Further, in the shield tunneling machine hole entry and exit anti-bowing device, the support member is an I-beam.

[0021] The shield tunneling machine hole entry and exit anti-bowing device provided by the utility model can effectively avoid the phenomenon of bowing (i.e. the front end sinks) of the shield tunneling machine when entering and exiting the tunnel portal, so that the shield tunneling machine can enter and exit the tunnel portal stably, the safety risk of shield launching and receiving in shield tunneling machine construction is greatly reduced, and the construction cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 A schematic diagram of the structure of the shield machine anti-head-down device after use, provided in this embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the anti-diving-head-down component in the shield machine entry and exit anti-diving device provided in this embodiment of the utility model;

[0025] Figure 3 for Figure 2 Section 1-1 in the diagram. Detailed Implementation

[0026] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] See Figures 1 to 3 The shield tunneling machine anti-head-down device according to this utility model embodiment includes: a bracket 1 for supporting the shield tunneling machine; a support member 2 connected between the bracket 1 and the anti-head-down member, and arranged laterally at the end of the bracket 1 near the tunnel entrance; two anti-head-down members 3 symmetrically arranged on both sides of the bottom of the tunnel entrance steel ring 5 and connected to the tunnel entrance steel ring 5 to support the shield tunneling machine 4 and prevent it from head-down; the top of the anti-head-down member 3 is flush with the top of the bracket 1, and the anti-head-down member 3 has an inclined surface to cooperate with the cutterhead 41 of the shield tunneling machine 4 to guide the shield tunneling machine in and out of the tunnel entrance.

[0028] Specifically, a rail is arranged on the bracket 1 to provide support and guidance for the shield machine. The support member 2 is connected between the bracket 1 and the anti-bowing member 3 and is arranged in the transverse direction at the end of the bracket 1 close to the tunnel portal, thereby enhancing the stability and load-bearing capacity of the overall structure. This arrangement ensures that good support effect can be maintained even under high load conditions, further ensuring the safety of construction. More specifically, the support member 2 is an I-beam, which can distribute the weight of the shield machine and the load generated during construction to a larger support area, thereby reducing the pressure on a single support point and improving the load-bearing capacity and durability of the overall structure.

[0029] In the present embodiment, the two anti-bowing members 3 can be symmetrically welded or screwed inside the tunnel portal steel ring, with the installation elevation being consistent with the support rail of the bracket 1. If the height of the device cannot meet the installation elevation, a steel plate can be appropriately added below the anti-bowing member 3, and if it is higher than the installation elevation, the bottom can be cut off to ensure that the design attitude of the shield machine entering and exiting the portal is met. Before the shield machine enters and exits the portal, lubricating oil is applied to the surface of the device facing the shield machine to achieve better use effect. The anti-bowing member 3 in the present embodiment can be made of a 43-type rail. The base of the anti-bowing member 3 is bolted or welded to the tunnel portal steel ring. The top of the anti-bowing member 3 is flush with the top of the bracket 1, which can provide load-bearing capacity for the shield machine. The anti-bowing member 3 has a slope, which can better adapt to the shape and running track of the cutter head of the shield machine, providing a smooth transition path for the shield machine. This can reduce resistance when the shield machine enters and exits the portal, avoid impact or jam caused by improper angle, and help improve construction efficiency and safety.

[0030] It is clear from the above that the anti-bowing device for shield machine entering and exiting the portal provided in the present embodiment can effectively prevent the shield machine from bowing (i.e., the front end sinking) when entering and exiting the portal by symmetrically arranging two anti-bowing members 3 on both sides of the bottom of the tunnel portal steel ring, and these members being flush with the top of the bracket 1. This allows the shield machine to smoothly enter and exit the portal, greatly reducing the safety risks of shield launching and receiving during construction of the shield machine, while also reducing construction costs.

[0031] Referring back to Figure 2 and 3 , in the above embodiment, the slope angle of the slope of the anti-bowing member 3 and the horizontal plane on which the bracket 1 is located is 20-60°. The slope angle of the slope of the anti-bowing member 3 and the horizontal plane on which the bracket 1 is located is 20°, which can be applicable to most scenarios during construction of the shield machine.

[0032] In the above embodiments, the anti-bending member 3 comprises a base 31, a guide portion 32 and a supporting portion 33 connected together, wherein the guide portion 32 and the supporting portion 33 are arranged on the base 31, the guide portion 32 has an inclined surface, and the supporting portion is connected to an end of the guide portion 32 away from the inclined surface.

[0033] The end of the inclined surface of the guide portion 32 close to the base has a height difference with the base.

[0034] Specifically, the base 31 can be a flat plate structure, which can be connected to the steel ring by bolts or welded to the steel ring.

[0035] The guide portion 32 can be connected by a first support plate and an inclined surface plate, which can be a trapezoidal structure.

[0036] The supporting portion 33 can be connected by a second support plate and a top plate, and the top plate is a horizontal plate, the length of which can be adjusted according to the width of the steel ring at the site. In order to avoid the interference between the cutter head and the device after the shield machine enters the hole and starts to dig, and to avoid affecting the sealing of the hole, the length of the top plate of the supporting portion 33 is less than the width of the steel ring under the working condition of entering the hole.

[0037] The height of the end surface of the supporting portion 33 is greater than the height of the end surface of the guide portion 32, and the end of the inclined surface of the guide portion 32 close to the base 31 has a height difference with the base 31, which can be determined according to the actual situation, for example, the height difference can be 1 / 4-1 / 3 of the height difference between the top plate of the supporting portion 33 and the base 31.

[0038] In order to expand the application range of the inclined surface, preferably, the inclined surface and the top plate of the supporting portion 33 are connected by a rotating shaft to adjust the inclination angle of the inclined surface. More specifically, a through hole can be formed in the connection part of the inclined surface and the top plate of the supporting portion 33, the rotating shaft is arranged in the through hole, and the rotating shaft is locked by a locking mechanism. The locking mechanism can be a locking nut.

[0039] Since the top surfaces of the guide portion 32 and the supporting portion 33 extend from the body (the respective support plates), in order to strengthen the protection of the shield machine 4, a plurality of reinforcing ribs are arranged in the vertical direction at the connection between the guide portion 32 and the supporting portion 33, and the reinforcing ribs can be welded between the base and the bottom of the inclined surface of the guide portion 32 and between the base and the top plate of the supporting portion 33.

[0040] In order to prolong the service life of the anti-bending member 3, a wear-resistant coating is arranged on the inclined surface and the top plate of the supporting portion 33.

[0041] In conclusion, the raw material is easy to find, the structure is simple, easy to manufacture, convenient to operate, convenient to use, the shield machine in-out hole posture is effectively controlled, the safety risk of shield starting and receiving in shield construction is greatly reduced, and the construction cost is reduced.

[0042] 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 device for preventing a tunnel boring machine from tilting its head down when entering or exiting a tunnel, characterized in that, include: Brackets are used to support tunnel boring machines; A support member is connected between the bracket and the anti-head-down component, and is arranged laterally at the end of the bracket near the tunnel entrance; Two anti-head-down components are symmetrically arranged on both sides of the bottom of the tunnel portal steel ring and connected to the portal steel ring to support the tunnel boring machine and prevent it from head-down. The top of the anti-head-down component is flush with the top of the bracket, and the anti-head-down component has an inclined surface to cooperate with the cutterhead of the tunnel boring machine to guide the tunnel boring machine in and out of the tunnel entrance. The anti-head-drop component includes: a connected base, a guide portion, and a support portion; wherein... The guide portion and the support portion are disposed on the base; The guide portion has an inclined surface, and the padding portion is connected to the end of the guide portion away from the inclined surface; There is a height difference between the inclined surface of the guide and the end of the base near the base; The inclined surface is connected to the top plate of the support portion by a pivot shaft to adjust the inclination angle of the inclined surface.

2. The anti-diving device for tunnel boring machines entering and exiting the tunnel according to claim 1, characterized in that, The slope angle between the inclined surface of the anti-head-down component and the horizontal plane where the bracket is located is 20-60°.

3. The anti-diving device for tunnel boring machines entering and exiting the tunnel according to claim 2, characterized in that, The slope angle between the inclined surface of the anti-head-down component and the horizontal plane where the bracket is located is 20°.

4. The anti-diving device for tunnel boring machines entering and exiting the tunnel according to claim 1, characterized in that, Several reinforcing ribs are provided at the connection between the guide part and the support part in the vertical direction.

5. The anti-diving device for tunnel boring machines entering and exiting the tunnel according to claim 1, characterized in that, Both the inclined surface and the top plate of the support are provided with a wear-resistant coating.

6. The anti-diving device for tunnel boring machines entering and exiting the tunnel according to claim 1, characterized in that, The base of the anti-head-down component is bolted or welded to the steel ring of the tunnel portal.

7. The anti-diving device for tunnel boring machines entering and exiting the tunnel according to claim 1, characterized in that, The anti-head-down component is made of 43-type steel rail.

8. The anti-diving device for tunnel boring machines entering and exiting the tunnel according to any one of claims 1 to 7, characterized in that, The support component is an I-beam.

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