A shield tunnel construction method and a shield tunnel construction using a temporary shield shaft structure

Abstract

A shield tunnel construction and construction method using a temporary shield well structure, comprising a shield well, the shield well is a receiving or launching shield well, a shield tunnel passes through the shield well, and a shield segment is installed in the shield tunnel; in the shield well, the shield tunnel is communicated with the shield well by removing the shield segment of the shield tunnel in the well; the shield well is a temporary shield well, a cast-in-place tunnel is arranged in the temporary shield well as a permanent structure, and is sealingly connected with the shield segments of the shield tunnels at both ends; and the temporary shield well above the cast-in-place tunnel is filled with backfill soil to the ground. The shield well structure above the tunnel can be arbitrarily destroyed according to subsequent engineering requirements. The invalid space in the tunnel is reduced, the occupation of underground space is reduced, and the structural use efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of shaft structures for the initiation or reception of shield tunnels in underground tunnel engineering, specifically providing a shield tunnel construction and construction method using a temporary shield shaft structure. Background Technology

[0002] In underground tunnel construction using the shield tunneling method, vertical shafts are located at both ends of the tunnel for launching or receiving the shield. In some projects, to increase the working face for excavation and material feeding, or for maintenance of the shield machine, a vertical shaft may also be constructed at a location in the middle of the tunnel. These shafts are called shield shafts, and they function to receive and launch shields. Shield shafts are generally constructed using the open-cut method, with the secondary lining structure poured within the foundation pit. After the shield tunnel construction is completed, this structure is usually topped with a roof slab, becoming part of the tunnel. It is designed and constructed as a permanent structure.

[0003] Shield tunnel shafts are generally quite high, extending from near the ground level to below the tunnel floor. For shield tunnels with significant burial depth, the remaining shafts are essentially useless redundant space unless they can be used for tunnel ventilation or escape routes. This increases safety hazards within the tunnel and wastes valuable underground space. Moreover, shield tunnel shafts are designed as permanent structures, and to ensure durability, their walls are often quite thick. Therefore, it is urgent to address these issues. Summary of the Invention

[0004] This invention provides a shield tunnel construction and construction method using a temporary shield shaft structure. Its purpose is to solve the technical problem that shield shafts left in tunnel engineering as permanent structures increase safety hazards in the tunnel and waste underground space when they have no other use.

[0005] The technical solution of the present invention is as follows:

[0006] A shield tunnel structure employing a temporary shield shaft includes a shield shaft, which serves as a receiving or launching shield shaft. A shield tunnel passes through the shield shaft, and shield segments are installed within the shield tunnel. Within the shield shaft, the shield tunnel is connected to the shield shaft by removing its existing shield segments. The shield shaft is a temporary shield shaft 200, within which a cast-in-place tunnel 300 is installed as a permanent structure and is sealed to the shield segments 101 of the shield tunnels 100 at both ends. Backfill soil 400 is filled into the temporary shield shaft above the cast-in-place tunnel to the ground level.

[0007] The aforementioned shield tunnel construction employs a temporary shield shaft structure, wherein the cast-in-place tunnel 300 is a concrete secondary lining structure 303 installed within the temporary shield shaft, corresponding to the shield tunnel, which is a cuboid structure with a central tunnel; the connection between the cast-in-place tunnel and the shield segment 101 is configured as a socket structure, that is, on both end faces of the cast-in-place tunnel, near the inner side of the tunnel, there are annular grooves corresponding to the annular end faces of the shield segment forming annular slots 301, and on the outer side forming limiting protrusions 302; the shield tunnels on both sides of the temporary shield shaft... The end of the shield tunnel segment penetrates the shaft wall and is embedded in the annular groove to form a socket-type connection; the inner annular surface of the cast-in-place tunnel is flush with the inner annular surface of the shield tunnel segment to form a smoothly connected tunnel interior 103; the concrete secondary lining structure of the cast-in-place tunnel is connected to the shield tunnel segment by bolts 102; the two ends of the limiting protrusion ring 302 abut against the inner surface of the temporary shield shaft wall; a gap 201 is provided between the shield tunnel segment and the temporary shield shaft wall and is filled with C20 concrete, and the gap 201 is blocked by the limiting protrusion ring.

[0008] The shield tunnel structure employing a temporary shield shaft includes a waterproof membrane 5 laid on the outer ring surface and both end faces of the cast-in-place tunnel, and an external waterstop 6 added on the basis of the waterproof membrane at the joint with the temporary shield shaft. Multiple layers of waterstop adhesive 7 are installed at the joint between the cast-in-place tunnel and the shield segment.

[0009] The shield tunnel structure employing a temporary shield shaft is described above, wherein the outer contour shape of the cross-section of the cast-in-place tunnel facade is rectangular.

[0010] The shield tunnel structure using a temporary shield shaft is described above, wherein the gap 202 between the waterproof layer set on both sides and bottom of the cast-in-place tunnel and the shaft wall is filled with C20 concrete backfill soil.

[0011] The present invention discloses a construction method for a shield tunnel using a temporary shield shaft structure, which includes the following steps:

[0012] ① Excavate the foundation pit,

[0013] ② Constructing the temporary shield tunnel structure,

[0014] ③ Receive and launch the shield tunnel, completing the shield tunnels at both ends of the shield shaft.

[0015] ④ Tighten the tunnel lining segments within a certain range adjacent to the shield tunnel shaft.

[0016] ⑤ Remove the shield tunnel segments within the shield shaft area.

[0017] ⑥ The shield shaft is set as a temporary shield shaft, and the concrete is poured inside the shield shaft. molded The tunnel, namely the cast-in-place tunnel 300, is connected to the shield tunnel segments at both ends by bolts, thus completing the shield tunnel.

[0018] ⑦ Fill the upper part of the cast-in-place tunnel in the temporary shield shaft with backfill soil down to the ground.

[0019] The construction method for a shield tunnel using a temporary shield shaft structure, wherein step ⑥ involves casting a precast tunnel structure within the shield shaft, includes the following steps.

[0020] ① Apply the underlying backfill layer;

[0021] ② Lay waterproof base slab and waterproof lower side walls;

[0022] ③ Cast the base slab and lower side wall structure;

[0023] ④ Pour the remaining side walls and roof slab structure;

[0024] ⑤ Lay waterproofing on the roof slab and the remaining side walls.

[0025] The construction method for a shield tunnel using a temporary shield shaft structure, wherein steps ② and ⑤, during waterproofing, involve installing waterproofing connections at both ends of the cast-in-place tunnel structure and the joints between the tunnel segments. This method includes the following steps:

[0026] ① A layer of water-stop adhesive is installed on the outer surface and end face of the shield tunnel segment;

[0027] ② An L-shaped grouting pipe 8 is installed at the joint between the end face of the cast-in-place tunnel structure and the shield segment. One end of the pipe is located between two layers of water-stop sealant, and the other end extends out of the inner surface of the cast-in-place tunnel structure.

[0028] ③ Fill the gap 201 between the temporary shield shaft and the tunnel segment with C20 plain concrete;

[0029] ④ Backfill the gap 202 between the temporary shield shaft and the cast-in-place tunnel structure with C20 plain concrete;

[0030] ⑤ An external waterstop 6 and a waterproof membrane 5 are installed at the joint 203 between the end face of the molded tunnel structure and the temporary shield shaft. The waterproof membrane extends from the end to the outer surface of the molded tunnel structure.

[0031] ⑥ Casting and molding the tunnel structure;

[0032] ⑦ After the concrete of the cast-in-place tunnel structure reaches the design strength, grout is injected into the joint between the end face of the cast-in-place tunnel structure and the shield tunnel segment through the grouting pipe.

[0033] The beneficial effects of this invention are:

[0034] This invention employs a temporary structure as the shield shaft structure, needed only during shield tunneling construction. After the shield tunneling is completed, a permanent tunnel lining is poured into the temporary shaft, connecting it to the shield segments at both ends of the shaft to form a permanent shield tunnel. The temporary shaft is then backfilled to ground level. Subsequently, the shield shaft structure above the tunnel can be easily removed as needed for later engineering work. This reduces unused space within the tunnel, minimizes the occupation of underground space, and improves structural efficiency. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the horizontal cross-sectional structure of the temporary shield tunnel shaft during the construction phase of this invention.

[0036] Figure 2 for Figure 1 Schematic diagram of the AA section of the facade.

[0037] Figure 3 A schematic diagram of the horizontal cross-sectional structure of the temporary shield tunnel shaft after the completion of construction according to this invention.

[0038] Figure 4 for Figure 3 Schematic diagram of the BB elevation section.

[0039] Figure 5 This invention provides a partial schematic diagram of the cross-section of the cast-in-place tunnel within the shield shaft area after the tunnel is completed.

[0040] Figure 6 This is a partial schematic diagram of the connection between the cast-in-place tunnel structure and the shield tunnel segment of the present invention (at the joint between the cast-in-place tunnel and the shaft wall).

[0041] Figure 7 This is a schematic diagram of the waterproof connection structure between the cast-in-place tunnel structure and the shield tunnel segment of the present invention (at the joint between the cast-in-place tunnel and the shaft wall).

[0042] Figure 8 This is a schematic diagram of the socket structure for connecting the cast-in-place tunnel structure and the shield tunnel segment of the present invention.

[0043] Explanation of the attached drawing numbers:

[0044] Shield tunnel 100, shield segment 101, bolt 102, tunnel interior 103, temporary shield shaft 200, gap 201, gap 202, temporary shield shaft joint 203, cast-in-place tunnel 300, annular slot 301, limiting protrusion ring 302, concrete secondary lining structure 303, backfill soil 400, waterproof membrane 5, external waterstop 6, waterstop adhesive 7, L-shaped grouting pipe 8. Detailed Implementation

[0045] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0046] See Figure 1-7 As shown, the present invention discloses a shield tunnel structure employing a temporary shield shaft, comprising a shield shaft, which serves as a receiving or launching shield shaft, through which a shield tunnel passes, and within which shield segments are installed; within the shield shaft, the shield tunnel is connected to the shield shaft by removing its shield segments already in the shaft; the shield shaft is a temporary shield shaft 200, within which a cast-in-place tunnel 300 is constructed as a permanent structure. (See also...) Figure 4 , 5 As shown, it is sealed and connected to the shield segments 101 of the shield tunnel 100 at both ends; the temporary shield shaft above the cast-in-place tunnel is filled with backfill soil 400 to the ground.

[0047] See Figure 4-8 As shown, a shield tunnel structure employing a temporary shield shaft is described, wherein the cast-in-place tunnel 300 is a concrete secondary lining structure 303 installed within the temporary shield shaft, corresponding to the shield tunnel, which is a cuboid structure with a central tunnel; the connection between the cast-in-place tunnel and the shield segment 101 is configured as a socket structure, that is, on both end faces of the cast-in-place tunnel, near the inner side of the tunnel, there are annular notches corresponding to the annular end faces of the shield segments forming annular slots 301, and on the outer side, there are limiting protrusions 302; the ends of the shield segments in the shield tunnel on both sides of the temporary shield shaft penetrate the shaft wall and are embedded in the annular notches to form a socket structure connection; see Figure 6 , 7 The inner ring surface of the cast-in-place tunnel is flush with the inner ring surface of the shield tunnel segment, forming a smoothly connected tunnel interior 103; the concrete secondary lining structure of the cast-in-place tunnel is connected to the shield tunnel segment by bolts 102; the two ends of the limiting protrusion ring 302 abut against the inner surface of the temporary shield shaft wall; a gap 201 is provided between the shield tunnel segment and the temporary shield shaft wall and is filled with C20 concrete, and the gap 201 is blocked by the limiting protrusion ring.

[0048] The shield tunnel structure employing a temporary shield shaft includes a waterproof membrane 5 laid on the outer ring surface and both end faces of the cast-in-place tunnel, and an external waterstop 6 added on the basis of the waterproof membrane at the joint with the temporary shield shaft. Multiple layers of waterstop adhesive 7 are installed at the joint between the cast-in-place tunnel and the shield segment.

[0049] The aforementioned shield tunnel construction employing a temporary shield shaft structure, wherein the outer contour shape of the cross-section of the cast-in-place tunnel facade is rectangular. Figure 5 .

[0050] The shield tunnel structure using a temporary shield shaft is described above, wherein the gap 202 between the waterproof layer set on both sides and bottom of the cast-in-place tunnel and the shaft wall is filled with C20 concrete backfill soil.

[0051] The present invention discloses a construction method for a shield tunnel using a temporary shield shaft structure, which includes the following steps, see below. Figure 1-5 As shown

[0052] ① Excavate the foundation pit,

[0053] ② Construct a temporary shield shaft with a 200mm structure.

[0054] ③ Receive and launch the shield tunnel, completing the shield tunnels at both ends of the shield shaft.

[0055] ④ Tighten the tunnel lining segments within a certain range adjacent to the shield tunnel shaft.

[0056] ⑤ Remove the shield tunnel segments within the shield shaft area.

[0057] ⑥ The shield shaft is set as a temporary shield shaft, and the concrete is poured inside the shield shaft. molded The tunnel, namely the cast-in-place tunnel 300, is connected to the shield tunnel segments at both ends by bolts 102, thus completing the shield tunnel.

[0058] ⑦ Fill the upper part of the cast-in-place tunnel in the temporary shield shaft with backfill soil to ground level, see [link to relevant documentation]. Figure 5 .

[0059] The construction method for a shield tunnel using a temporary shield shaft structure, wherein step ⑥ involves casting a precast tunnel structure within the shield shaft, includes the following steps.

[0060] ① Apply the underlying backfill layer;

[0061] ② Lay waterproofing on the base slab and the lower side walls, i.e., lay waterproof membrane;

[0062] ③ Cast the base slab and lower side wall structure;

[0063] ④ Pour the remaining side walls and roof slab structure;

[0064] ⑤ Lay waterproofing on the roof slab and the remaining side walls.

[0065] The construction method for a shield tunnel using a temporary shield shaft structure, wherein in steps ② and ⑤, during the waterproofing process, waterproof connection structures are installed at both ends of the cast-in-place tunnel structure and the joints between the tunnel segments and the shield tunnel sections. This method includes the following steps, see [link to details]. Figure 6 , 7 As shown,

[0066] ① A layer of water-stop adhesive is installed on the outer surface and end face of the shield tunnel segment;

[0067] ② An L-shaped grouting pipe 8 is installed at the joint between the end face of the cast-in-place tunnel structure and the shield segment. One end of the pipe is located between two layers of water-stop sealant, and the other end extends out of the inner surface of the cast-in-place tunnel structure.

[0068] ③ Fill the gap 201 between the temporary shield shaft and the tunnel segment with C20 plain concrete;

[0069] ④ Backfill the gap 202 between the temporary shield shaft and the cast-in-place tunnel structure with C20 plain concrete;

[0070] ⑤ An external waterstop 6 and a waterproof membrane 5 are installed at the joint 203 between the end face of the molded tunnel structure and the temporary shield shaft. The waterproof membrane extends from the end to the outer surface of the molded tunnel structure.

[0071] ⑥ Casting and molding the tunnel structure;

[0072] ⑦ After the concrete of the cast-in-place tunnel structure reaches the design strength, grout is injected into the joint between the end face of the cast-in-place tunnel structure and the shield tunnel segment through the grouting pipe.

Claims

1. A construction method for a shield tunnel using a temporary shield shaft structure, comprising a shield shaft, the shield shaft being a receiving or launching shield shaft, a shield tunnel passing through the shield shaft, and shield segments installed inside the shield tunnel; within the shield shaft, the shield tunnel is connected to the shield shaft by removing its shield segments inside the shaft; the shield shaft is a temporary shield shaft (200), and a cast-in-place tunnel (300) is provided within the temporary shield shaft as a permanent structure, and is sealed and connected to the shield segments (101) of the shield tunnels (100) at both ends; backfill soil (400) is filled into the temporary shield shaft above the cast-in-place tunnel to the ground surface; The cast-in-place tunnel (300) is a concrete secondary lining structure (303) set up inside the temporary shield shaft, corresponding to the shield tunnel. It is a cuboid structure with a tunnel in the center. The connection between the cast-in-place tunnel and the shield segment (101) is set as a socket structure. That is, on both ends of the cast-in-place tunnel, the inner side near the tunnel is provided with an annular notch corresponding to the annular end face of the shield segment to form an annular slot (301), and the outer side forms a limiting protrusion (302). The ends of the shield segments inside the shield tunnel on both sides of the temporary shield shaft penetrate into the shaft wall and... The annular groove is embedded to form a socket-type connection; the inner annular surface of the cast-in-place tunnel is flush with the inner annular surface of the shield segment to form a smooth connection inside the tunnel (103); the concrete secondary lining structure of the cast-in-place tunnel is connected to the shield segment by bolts (102); the two ends of the limiting protrusion ring (302) abut against the inner surface of the temporary shield shaft wall; a gap (201) is provided between the shield segment and the temporary shield shaft wall and is filled with C20 concrete, and the gap (201) is blocked by the limiting protrusion ring. Waterproof membrane (5) is laid on the outer ring surface and end faces of the cast-in-place tunnel, and an external water-stop strip (6) is added on the basis of the waterproof membrane at the joint with the temporary shield shaft. Multiple layers of water-stop adhesive (7) are installed at the joint between the cast-in-place tunnel and the shield segment. Its features are, It includes the following steps: ① Excavate the foundation pit, ② Constructing the temporary shield tunnel structure, ③ Receive and launch the shield tunnel, completing the shield tunnels at both ends of the shield shaft. ④ Tighten the tunnel lining segments within a certain range adjacent to the shield tunnel shaft. ⑤ Remove the shield tunnel segments within the shield shaft area. ⑥ The shield shaft is set as a temporary shield shaft. A cast-in-place tunnel (300) is poured inside the shield shaft and connected to the shield tunnel segments at both ends by bolts (102), thereby completing the shield tunnel. ⑦ Fill the upper part of the cast-in-place tunnel in the temporary shield shaft with backfill soil (400) down to the ground.

2. The construction method for a shield tunnel structure employing a temporary shield shaft as described in claim 1, characterized in that, The cross-sectional shape of the cast-in-place tunnel facade is rectangular.

3. The construction method for a shield tunnel structure employing a temporary shield shaft as described in claim 2, characterized in that, The gap (202) between the waterproof layer on both sides and bottom of the cast-in-place tunnel and the well wall is filled with C20 concrete backfill soil.

4. The construction method for a shield tunnel structure employing a temporary shield shaft as described in claim 3, characterized in that, Step ⑥, which involves casting the precast tunnel structure inside the shield shaft, includes the following steps: ① Apply the underlying backfill layer; ② Lay waterproof base slab and waterproof lower side walls; ③ Cast the base slab and lower side wall structure; ④ Pour the remaining side walls and roof slab structure; ⑤ Lay waterproofing on the roof slab and the remaining side walls.

5. A construction method for a shield tunnel structure employing a temporary shield shaft as described in claim 4, characterized in that, In steps ② and ⑤, during the waterproofing process, a waterproof connection structure is installed at both ends of the cast-in-place tunnel structure and the joints between the tunnel segments and the shield tunneling sections. This includes the following steps: ① A layer of waterproof sealant is installed on the outer surface and end face of the shield tunnel segment (7); ② An L-shaped grouting pipe (8) is installed at the joint between the end face of the molded tunnel structure and the shield segment. One end of the pipe is located between two layers of water-stop sealant, and the other end extends out of the inner surface of the molded tunnel structure. ③ Fill the gap (201) between the temporary shield shaft and the tunnel lining segments with C20 plain concrete; ④ Backfill the gap (202) between the temporary shield shaft and the cast-in-place tunnel structure with C20 plain concrete; ⑤ An external waterstop (6) and a waterproof membrane (5) are installed at the joint (203) between the end face of the molded tunnel structure and the temporary shield shaft. The waterproof membrane extends from the end to the outer surface of the molded tunnel structure. ⑥ Casting and molding the tunnel structure; ⑦ After the concrete of the cast-in-place tunnel structure reaches the design strength, grout is injected into the joint between the end face of the cast-in-place tunnel structure and the shield tunnel segment through the grouting pipe.

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