Efficient propelling station-crossing method for super-large-diameter slurry shield

Abstract

The invention discloses an efficient propulsion station-crossing method for an ultra-large-diameter slurry shield, which comprises the following steps of: arranging a base in a working well, so that the base is arranged between a starting hole and a receiving hole of the working well; the station-crossing shield tunneling machine is pushed out through the receiving hole, so that the station-crossing shield tunneling machine is placed on the arc-shaped supporting face, and the guide rail of the base is embedded in an outer edge notch of a cutter head of the station-crossing shield tunneling machine; the station-crossing shield tunneling machine paves a plurality of arc-shaped pipe pieces on an arc-shaped supporting surface between a shield tail and a receiving ring in a receiving hole so as to form a translation reaction frame supported on the lower side of the shield tail of the station-crossing shield tunneling machine, so that the station-crossing shield tunneling machine is propelled to cross a station by means of the reaction force of the translation reaction frame; and before the station-crossing shield tunneling machine enters the starting hole, a starting reaction frame is formed at the other end of the translation reaction frame in a post-pouring mode so as to be supported at the shield tail, and therefore the station-crossing shield tunneling machine is propelled into the starting hole by means of the reaction force of the starting reaction frame. The problem that an existing shield tunneling station-crossing method is large in later-stage dismantling is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of shield construction, and particularly relates to an efficient propulsion method for a super-large diameter slurry shield to pass through a station. Background Art

[0002] During the construction of a shield tunnel, conventional shield passing-through methods include the backfilling passing-through method and the separation of the main machine and the rear support of the shield machine to pass through the station.

[0003] For the backfilling passing-through method, this method first constructs a mortar base in the working shaft, and then backfills the shaft with soil or foam concrete to create a construction environment similar to the shield machine advancing in the soil in the working shaft. The backfilled soil is used to balance the water and soil pressures inside and outside the shaft. After the shield passes through the station, grouting is carried out on the starting and receiving portal openings, and then the backfilled soil or foam concrete is excavated, and the portal openings are blocked at the same time. Finally, the segments in the working shaft are removed to complete the passing-through construction.

[0004] For the separation of the main machine and the rear support of the shield machine to pass through the station, a special steel base (which also serves as the shield receiving and starting base) is generally used. After the shield machine receives and sits on the base, the main body of the shield machine is separated from the frame. The steel base is jacked and translated. After the shield machine arrives on the steel base, a reinforced concrete structure for the frame to travel and the starting reaction frame is poured. After curing, the frame is towed into place, and finally the main body of the shield machine is connected to the frame. After re-adjustment, the shield starts.

[0005] Regarding the backfilling passing-through method, this method is generally used for small-diameter shield machines to pass through stations. When applied to the passing-through construction of large-diameter highway tunnels, due to the large volume of the working shaft, the amount of soil or foam concrete to be backfilled is huge. At the same time, the workload of cleaning the soil or foam concrete is large, the construction period is long, and the cost is relatively high. In terms of removing the segments in the shaft, since the passing-through backfilling method requires the assembled segments to form a tunnel during the construction in the shaft, the number of segments in a large-diameter tunnel is large and the self-weight is heavy. Because of the need for lateral support force in the working shaft of a large highway tunnel, foundation pit support structures such as structural slabs and concrete supports are arranged above the shield construction layer. The removed segments need to be translated to the lifting port for vertical transportation after removal, which increases the difficulty and construction period of removing the segments. At the same time, due to ensuring construction safety during the removal process, the tunnel structure in the shaft cannot be constructed and passed through, which has a certain impact on the overall project construction period.

[0006] Regarding the separation and passing of the rear support of the shield machine main body through the station, this solution is applicable to the translation of shield machines in various working shafts, but it also has relatively large limitations. For this project, the construction period of the shield construction is tight, and there are many limitations: during the translation of the shield machine main body and each section of the frame, it is necessary to disconnect the structural connectors, pipelines, and cables, and the construction is complex; the steel base needs to be equipped with a complex jacking system. The bottom plate needs to be leveled with yellow sand and steel plates, and the workload is large; after the main machine is translated to the starting position, it is necessary to construct a concrete frame walking base, and the construction and maintenance time are long; after the shield main machine and the rear support frame are all translated in place, they need to be reconnected and debugged again, occupying a certain construction period. Summary of the Invention

[0007] In order to overcome the defects existing in the prior art, the present invention provides an efficient propulsion method for a super-large diameter slurry shield to solve the problem of large-scale demolition in the existing shield propulsion method.

[0008] To achieve the above object, the present invention provides an efficient propulsion method for a super-large diameter slurry shield, including the following steps:

[0009] A base is arranged in the working shaft, so that the base is arranged between the starting hole and the receiving hole of the working shaft. An arc-shaped supporting surface is formed on the base, and the radian of the arc-shaped supporting surface is adapted to the radian of the outer wall of the shield machine passing through the station. The inner arc surface of the arc-shaped supporting surface is arranged upward, and guide rails are respectively arranged on the opposite sides in the arc-forming direction of the arc-shaped supporting surface;

[0010] The shield machine passing through the station is pushed out through the receiving hole, so that the shield machine passing through the station is placed on the arc-shaped supporting surface, and the guide rails are embedded in the outer edge gaps of the cutter head of the shield machine passing through the station;

[0011] Between the shield tail of the shield machine passing through the station and the receiving ring in the receiving hole, multiple arc-shaped segments are laid on the arc-shaped supporting surface to form a translation reaction frame that supports the lower side of the shield tail of the shield machine passing through the station, so that the shield machine passing through the station advances through the station by means of the reaction force of the translation reaction frame;

[0012] Before the shield machine passing through the station enters the starting hole, a starting reaction frame is post-cast at the other end of the translation reaction frame to support the shield tail, so that the shield machine passing through the station advances into the starting hole by means of the reaction force of the starting reaction frame.

[0013] Further, a reserved groove is formed on the arc-shaped supporting surface, and anchor bolts are arranged in the reserved groove. The arc-shaped segment includes three wedge-shaped segments. The step of laying multiple arc-shaped segments on the arc-shaped supporting surface includes:

[0014] When laying each arc-shaped segment, place the three wedge-shaped segments on the arc-shaped support surface;

[0015] Insert a caulking plate into the joint between two adjacent wedge-shaped segments;

[0016] Install connecting bolts between two adjacent wedge-shaped segments, and pass the connecting bolts through the caulking plate;

[0017] Connect the caulking plate to the anchor.

[0018] Furthermore, the three wedge-shaped segments are Block B1 - Block B3, or Block B5 - Block B7.

[0019] Furthermore, the central angle of the arc-shaped support surface is greater than 68°.

[0020] The beneficial effects of the present invention are as follows. The high-efficiency propulsion and passing-through-station method for an extra-large diameter slurry shield of the present invention constructs a base between the receiving opening and the launching opening of the working shaft to bear the shield machine. During the propulsion and passing-through-station of the shield machine, first lay a translation reaction frame on the base, and then pour the launching reaction frame to enable the shield machine to enter the launching opening, greatly reducing the later cutting and chiseling workload and improving the construction efficiency. On the other hand, the high-efficiency propulsion and passing-through-station device for an extra-large diameter slurry shield of the present invention has small requirements for equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objectives, and advantages of the present application will become more apparent:

[0022] Figure 1 It is a flow schematic diagram of the high-efficiency propulsion and passing-through-station method for an extra-large diameter slurry shield according to an embodiment of the present invention.

[0023] Figure 2 It is a top view of the working shaft according to an embodiment of the present invention.

[0024] Figure 3 It is a structural schematic diagram of the base according to an embodiment of the present invention.

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the translation reaction frame according to an embodiment of the present invention.

[0026] Figure 5 It is a plane schematic diagram of the translation reaction frame according to an embodiment of the present invention.

[0027] Figure 6 It is a structural schematic diagram of the launching reaction frame according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention and are not intended to limit the invention. Additionally, it should be noted that for ease of description, only the parts related to the invention are shown in the drawings.

[0029] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0030] Referring to Figures 1 to 6 As shown, the present invention provides an efficient propulsion method for a super-large diameter slurry shield passing through a station, including the following steps:

[0031] S1. A base 1 is arranged in the working shaft 4, such that the base 1 is arranged between the launching hole a and the receiving hole b of the working shaft 4. An arc-shaped supporting surface 10 is formed on the base 1, and the radian of the arc-shaped supporting surface 10 is adapted to the radian of the outer wall of the shield machine passing through the station. The inner arc surface of the arc-shaped supporting surface 10 is arranged upward, and guide rails 11 are respectively arranged on the opposite sides in the arc-forming direction of the arc-shaped supporting surface 10.

[0032] The base 1 is arranged in the working shaft 4. The base 1 is arranged between the launching hole a and the receiving hole b of the working shaft 4.

[0033] Specifically, the width of the base gradually decreases from bottom to top. An arc-shaped supporting surface 10 is formed on the base 1. The arc-shaped supporting surface 10 is used to support the shield machine passing through the station. The radian of the arc-shaped supporting surface 10 is adapted to the radian of the outer wall of the shield machine passing through the station. The inner arc surface of the arc-shaped supporting surface 10 is arranged upward. Guide rails 11 are respectively arranged on the opposite sides in the arc-forming direction of the arc-shaped supporting surface 10. The guide rails 11 are used to be embedded in the outer edge notches of the cutter head of the shield machine passing through the station.

[0034] Combined with Figure 1 As shown, before constructing the base, the axis design of the shield machine and the spatial boundary calibration are determined. Based on the axis design of the shield machine, the designs of the base, the translation reaction frame, and the launching reaction frame are determined, as well as the positions of the reserved steel bar connectors or the reserved steel bars.

[0035] After that, the construction of the base and part of the translation reaction frame is carried out to receive the shield machine.

[0036] S2. The shield machine passing through the station is pushed out through the receiving hole b, such that the shield machine passing through the station is placed on the arc-shaped supporting surface 10, and the guide rails 11 are embedded in the outer edge notches of the cutter head of the shield machine passing through the station.

[0037] S3. Between the shield tail of the passing shield machine and the receiving ring 41 in the receiving opening b, a plurality of arc-shaped segment linings 21 are laid on the arc-shaped supporting surface 10 to form a translation reaction frame 2 that supports the lower side of the shield tail of the passing shield machine, so that the passing shield machine advances through the station by means of the reaction force of the translation reaction frame 2.

[0038] During the shield receiving and the passing-through station propulsion, the construction of the remaining translation reaction frames is carried out.

[0039] In this embodiment, the translation reaction frame 2 is used to support the lower side of the end face of the shield tail.

[0040] Specifically, the translation reaction frame 2 includes a plurality of arc-shaped segment linings 21. The plurality of arc-shaped segment linings 21 are laid on the arc-shaped supporting surface 10. The plurality of arc-shaped segment linings 21 are coaxially arranged with the passing shield machine. The plurality of arc-shaped segment linings 21 are arranged along the length direction of the arc-shaped supporting surface 10. One end of the translation reaction frame 2 is supported on the receiving ring 41 in the receiving opening b.

[0041] As a preferred embodiment, the arc-shaped segment lining 21 includes three wedge-shaped segment linings.

[0042] In this embodiment, referring to Figure 5 as shown, the three wedge-shaped segment linings are the B1 block to the B3 block, or the B5 block to the B7 block.

[0043] Referring to Figure 3 as shown, the two guide rails (i.e., guiding rails) on the base are 120 mm × 120 mm square rails. The guide rails are adapted to the position of the notch of the cutter head, so that the rails are embedded in the notch of the cutter head.

[0044] As a preferred embodiment, the central angle of the arc-shaped supporting surface 10 is greater than 68°. The two sides of the base cover the 68° range of the traveling wheels of the shield machine frame, ensuring the stability of the shield machine and the shield machine frame during the passing-through of the station.

[0045] In this embodiment, the arc-shaped supporting surface 10 is formed with a reserved groove. An anchor is provided in the reserved groove. The anchor is connected to the arc-shaped segment lining 21.

[0046] A caulking plate is provided between two adjacent wedge-shaped segment linings. The connecting bolts of two adjacent wedge-shaped segment linings penetrate through the caulking plate, and the anchor is connected to the caulking plate.

[0047] A steel bar coupler is embedded at the bottom of the reserved groove. The steel bar coupler is connected to the anchor through a connecting steel bar.

[0048] Referring to Figure 2 as shown, in this embodiment, the base in the working shaft is cast in full length along the shield machine propulsion direction, and two longitudinal reserved grooves are provided. Horizontal and vertical steel bar couplers are reserved in the reserved grooves at intervals of φ18@500 for personnel walking and segment lining fixing during the passing-through of the station. The inner walls of the grooves are roughened to facilitate the consolidation of concrete.

[0049] The translation reaction frame is composed of precast segments. One end of the translation reaction frame is connected to the receiving ring and installed until the shield machine is in place before advancing to the starting opening.

[0050] The translation reaction frame uses the B1 - B3 and B5 - B7 in the conventional 40mm wedge - shaped segments as the force - bearing structure for advancing during the station - passing. It can compensate for the 33mm wedge amount and provide a jacking force of about 60000 KN.

[0051] To ensure the stability of the segments, anchor fittings (such as 42# anchor bolts) are installed at the reserved grooves of the corresponding pedestals. At the pedestals, the anchor bolts are welded to the φ18 steel bars connected to the steel bar couplers. Caulking plates (such as thin steel plates) are stuffed into the gaps between the segments. The caulking plates are welded between the segments to improve the integrity.

[0052] In this embodiment, when laying multiple arc - shaped segments 21 on the arc - shaped support surface 10, it includes:

[0053] S31. When laying each arc - shaped segment 21, place three wedge - shaped segments on the arc - shaped support surface 10.

[0054] S32. Insert a caulking plate into the joint between two adjacent wedge - shaped segments.

[0055] S33. Install connecting bolts between two adjacent wedge - shaped segments and pass the connecting bolts through the caulking plate.

[0056] S34. Connect the caulking plate to the anchor fittings.

[0057] S4. Before the station - passing shield machine enters the starting opening a, a starting reaction frame 3 is post - cast at the other end of the translation reaction frame 2 to support the shield tail, so that the station - passing shield machine advances into the starting opening a with the reaction force of the starting reaction frame 3.

[0058] The starting reaction frame 3 is post - cast at the other end of the translation reaction frame 2. The starting reaction frame 3 is used to support the shield tail.

[0059] When the shield machine advances to the starting opening during station - passing, the starting reaction frame (cast - in - place structure) is cast at the tail of the starting shield machine.

[0060] The starting - position reaction frame is a cast - in - place concrete structure. Its bottom is connected to the translation reaction frame, and the rest is a cast - in - place reaction frame. The translation reaction frame needs to be strongly connected to the starting - position reaction frame through steel bars and anchor bolts. The steel bars of the cast - in - place structure at other positions are designed according to the requirement of a total thrust of 70000 KN.

[0061] The efficient propulsion and passing-through method for an extra-large diameter slurry shield of the present invention constructs a base between the receiving opening and the launching opening of the working shaft to support the shield machine. During the propulsion and passing-through of the shield machine, a translation reaction frame is first laid on the base, and then a launching reaction frame is poured to enable the shield machine to enter the launching opening, greatly reducing the later cutting and chiseling workload and improving the construction efficiency. On the other hand, the efficient propulsion and passing-through device for an extra-large diameter slurry shield of the present invention has small requirements for equipment and personnel.

[0062] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. An efficient propulsion method for a super-large diameter slurry shield when passing through a station, characterized in that The method includes the following steps: A base is arranged in the working shaft, such that the base is arranged between the launching hole and the receiving hole of the working shaft. An arc-shaped supporting surface is formed on the base, and the radian of the arc-shaped supporting surface is adapted to the radian of the outer wall of the passing shield machine. The inner arc surface of the arc-shaped supporting surface is arranged upward, and guide rails are respectively arranged on opposite sides of the arc-shaped supporting surface in the arc-forming direction; The passing shield machine is pushed out through the receiving hole, such that the passing shield machine is placed on the arc-shaped supporting surface, and the guide rails are embedded in the outer edge notches of the cutter head of the passing shield machine; Multiple arc-shaped segments are laid on the arc-shaped supporting surface between the shield tail of the passing shield machine and the receiving ring in the receiving hole to form a translation reaction frame that supports the lower side of the shield tail of the passing shield machine, such that the passing shield machine is advanced through the station by means of the reaction force of the translation reaction frame; Before the passing shield machine enters the launching hole, a launching reaction frame is post-cast at the other end of the translation reaction frame to support the shield tail, such that the passing shield machine is advanced into the launching hole by means of the reaction force of the launching reaction frame.

2. The efficient propulsion and passing-through station method for super-large diameter slurry shield according to claim 1, wherein A reserved groove is formed in the arc-shaped supporting surface, and an anchor is arranged in the reserved groove. The arc-shaped segment includes three wedge-shaped segments. The step of laying multiple arc-shaped segments on the arc-shaped supporting surface includes: When laying each arc-shaped segment, placing the three wedge-shaped segments on the arc-shaped supporting surface; Inserting a caulking plate into the joint between two adjacent wedge-shaped segments; Installing connecting bolts between two adjacent wedge-shaped segments and passing the connecting bolts through the caulking plate; Connecting the caulking plate to the anchor.

3. The efficient propulsion and passing-through station method for an extra-large diameter slurry shield according to claim 1, characterized in that, The three wedge-shaped segments are block B1 to block B3, or block B5 to block B7.

4. The efficient propulsion and passing-through station method for an extra-large diameter slurry shield according to claim 1, characterized in that The central angle of the arc-shaped supporting surface is greater than 68°.

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