Method for assembling negative ring of combined highway-railway large-section shield tunnel

Abstract

The present application relates to a kind of highway-railway combined large-section shield tunnel negative ring assembly construction method, the beneficial effects of the present application are: relying on reaction frame installation guide bearing structure, provide stable and reliable temporary support for negative ring segment assembly, ensure the position accuracy of negative ring segment assembly operation;After negative ring segment is placed in position, before being connected into ring, it is temporarily tied up by tie fixing screw, which can effectively avoid the displacement of negative ring segment;After the segment connected into ring is pushed out from shield tail steel ring, it is supported and fixed using arc-shaped support wedge, and the negative ring segment is tied up using steel wire rope, which can effectively avoid the displacement and elliptical deformation of negative ring.Compared with traditional construction technology, the present application can effectively improve the positioning accuracy of negative ring segment assembly, reduce the workload on site, improve construction efficiency, reduce the difficulty of negative ring segment removal in later stage, and save construction cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of tunnel shield construction, and particularly relates to a method for assembling a negative ring of a large-section shield tunnel built by a combined railway and highway. BACKGROUND

[0002] Before shield tunnel construction, a negative ring segment is usually assembled outside the portal to assist the shield machine in advancing. Since the shield machine has a large advancing thrust, the bearing capacity of the negative ring segment and the reaction frame is required to be high. In addition, since the shield machine uses the negative ring as a support point, the assembling accuracy of the negative ring is also required to be high. In construction, to avoid deformation of the assembled negative ring segment, the negative ring segment is usually welded into a whole, which can effectively avoid deviation and elliptical deformation during construction. However, the post removal operation is difficult, and it is difficult to correct the deviation and elliptical deformation. Before the segment is assembled into a ring, the segment is temporarily fixed to the shield tail and the reaction frame by welding buckles, and the temporary fixing is removed after the segment is assembled into a ring. This method has a large amount of on-site operation and the segment position is difficult to adjust. SUMMARY

[0003] The present application aims to overcome the deficiencies in the prior art and provide a method for assembling a negative ring of a large-section shield tunnel built by a combined railway and highway.

[0004] The method for assembling a negative ring of a large-section shield tunnel built by a combined railway and highway comprises the following construction steps:

[0005] Step 1: Pouring a starting base, and installing a support rail, a guide rail and a reaction frame; assembling the shield machine in sections relying on the starting base, supporting the shield tail ring on the support rail, and installing an anti-rotation support between the shield tail ring and the guide rail;

[0006] Step 2: Assembling a guide bearing structure, fixing the front end of a hydraulic jack to the support ring and the rear end to the reaction frame; adjusting the guide bearing ring to be in a straight line with the tunnel;

[0007] Step 3: Placing the negative ring segment in the shield tail ring relying on the guide bearing ring and temporarily fixing it by a tie fixing screw rod, and fixing the negative ring segment to form a negative ring 1 by using a circumferential fastening bolt;

[0008] Step 4: Increasingly removing the tie fixing screw rod to fix the negative ring segment in front of the negative ring 1, and connecting and fixing the negative ring 2 to the negative ring 1 after the negative ring 2 is fixed to form a negative ring 2;

[0009] Step 5: Pushing out the negative ring 1 by a pushing jack in the shield tail ring, and supporting and fixing the negative ring 1 by using an arc-shaped support wedge;

[0010] Step 6: Repeating the assembling and pushing out of the negative ring until the shield machine completely enters the stratum.

[0011] Preferably, in step one, the launching base is poured, and the supporting rails are installed in the middle of the launching base, the guide rails are installed on both sides of the launching base, and the reaction frame is installed at the rear end of the launching base.

[0012] As a preferred option, in step one, the tunnel boring machine is assembled segment by segment based on the starting base. The tail steel ring is supported on the support rails, and an anti-rotation bracket is installed on the tail steel ring. The arc-shaped clamping plate of the anti-rotation bracket is spot-welded to the tail steel ring, and the support pulley of the anti-rotation bracket is supported on the guide rails.

[0013] Preferably, in step two, the guide bearing structure includes a guide bearing steel ring, a support steel ring, a rubber ring, hydraulic jacks, and a guide screw. The guide bearing structure is installed on the reaction frame via hydraulic jacks. One end of the guide screw is fixed to the guide bearing steel ring, and the other end passes through the rubber ring and exits through the support steel ring. The rubber ring is sandwiched between the guide bearing steel ring and the support steel ring. The rear end of the hydraulic jack is fixed to the reaction frame, and the front end of the hydraulic jack is fixed to the support steel ring. Multiple hydraulic jacks are arranged circumferentially along the support steel ring. Step three specifically involves assembling the guide bearing structure on the ground, then fixing the front end of the hydraulic jack to the support steel ring and the rear end of the hydraulic jack to the reaction frame. After the guide bearing structure is installed in place, the axial tilt angle of the guide bearing steel ring is adjusted by controlling the extension and retraction of the hydraulic jacks, so that the guide bearing steel ring is on the same straight line as the tunnel axis.

[0014] As a preferred option, in step three, when splicing the negative ring one, the negative ring segments are transported to the shield tail steel ring, and the negative ring segments are spliced ​​using the guide bearing steel ring. After the negative ring segments are placed in place, the buckles are hooked onto the front end of the negative ring segments, and the tie fixing screws are tightened so that the rear end of the negative ring segments is tightly attached to the guide bearing steel ring. After all the negative ring segments of negative ring one are placed in place, the adjacent negative ring segments are fixed together to form an integral ring using circumferential fastening bolts.

[0015] Preferably, in step four, when splicing negative ring two, negative ring segments are placed forward from negative ring one, and the longitudinal splices of negative ring two and negative ring one are staggered. After each negative ring segment of negative ring two is placed in place, the buckles at the front end of the tie-fixing screw are removed one by one, and an extension screw is added. Then the buckles are installed and the tie-fixing screw is tightened to fix the negative ring segments. After all the negative ring segments of negative ring two are placed in place, circumferential fastening bolts are used to fix adjacent negative ring segments to form a whole ring, and longitudinal fastening bolts are used to connect and fix negative ring two to negative ring one.

[0016] Preferably, in step five, the negative ring one is pushed out of the shield tail steel ring by the jacking jack inside the shield tail steel ring, and then the negative ring one is supported and fixed by the arc-shaped support wedges. The arc-shaped support wedges are symmetrically arranged on both sides of the negative ring one, and the steel wire rope is passed out from under the negative ring one and wrapped around the negative ring one. Then, the steel wire rope connectors at the ends of the two steel wire ropes are connected together by the fastening screws, and the steel wire ropes are tightened around the negative ring segment by the fastening screws.

[0017] As a preferred embodiment, step six specifically involves splicing the negative ring segments section by section to form a negative ring according to the method described in step four, and then, according to the method described in step five, pushing the spliced ​​negative ring out from the tail steel ring and fixing it until the tunnel boring machine has completely entered the stratum.

[0018] The negative ring assembly system for a large-section shield tunnel combined with railway and highway construction is obtained by any of the methods described above.

[0019] The beneficial effects of this invention are:

[0020] 1) The guide bearing structure proposed in this invention, which is fixed by the reaction frame, can provide stable and reliable temporary support for the assembly of negative ring segments. In addition, the axis of the guide bearing steel ring can be precisely adjusted by hydraulic jacks before the segment assembly operation to ensure the positional accuracy of the negative ring segment assembly operation.

[0021] 2) After the negative ring segments are placed in place and before they are connected into a ring, they are temporarily tied and fixed by tie-fixing screws, which can effectively prevent the negative ring segments from shifting and reduce the installation difficulty of the negative ring segments.

[0022] 3) After the segments connected into a ring are pushed out from the tail steel ring, they are supported and fixed by arc-shaped support wedges, which can effectively prevent the negative ring from shifting. In addition, the front end of the arc-shaped support wedge is equipped with a steel wire rope, and the steel wire ropes on the two pairs of arc-shaped support wedges are wrapped around the outside of the negative ring to prevent the negative ring from elliptical. The lower side of the arc-shaped support wedge is also equipped with a limiting groove, which can effectively prevent the arc-shaped support wedge from being squeezed out by the negative ring segments.

[0023] 4) The negative ring assembly construction method proposed in this invention can effectively improve the accuracy of negative ring segment assembly and positioning, reduce on-site workload, improve construction efficiency, reduce the difficulty of dismantling negative ring segments in the later stage, and save construction costs compared with traditional construction techniques. Attached Figure Description

[0024] Figure 1 3D structural diagram of the guide bearing structure;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the guide bearing steel ring;

[0026] Figure 3 This is a three-dimensional structural diagram of the tie rod;

[0027] Figure 4 It is the negative ring assembly process Figure 1 ;

[0028] Figure 5 It is the negative ring assembly process Figure 2 ;

[0029] Figure 6 It is the negative ring assembly process Figure 3 ;

[0030] Figure 7 This is a schematic diagram of the three-dimensional structure of the negative ring assembly;

[0031] Figure 8 This is a schematic diagram of a three-dimensional structure with a negative ring ejected from the top;

[0032] Figure 9 This is a schematic diagram of a three-dimensional structure reinforced with a negative ring.

[0033] Figure 10 This is a detailed 3D structural diagram of the negative ring segment reinforcement.

[0034] Figure 11 A schematic diagram of the three-dimensional structure of the annular wedge.

[0035] The markings in the diagram are: 11-Guide bearing steel ring, 12-Support steel ring, 13-Rubber ring, 14-Hydraulic jack, 15-Guide screw, 16-Tie fixing screw, 17-Fixing sleeve, 18-Snap fastener, 19-Extending screw, 21-Starting base, 22-Reaction frame, 23-Support rail, 24-Guide rail, 31-Shield tail steel ring, 32-Pushing jack, 33-Anti-rotation bracket, 34-Support pulley, 35-Arc-shaped clamp, 41-Arc-shaped support wedge, 42-Limiting groove, 43-Guide groove, 44-Wire rope, 45-Wire rope connector, 46-Fasting screw, 51-Negative ring one, 52-Negative ring two, 53-Negative ring segment, 54-Circumferential fastening bolt, 55-Longitudinal fastening bolt. Detailed Implementation

[0036] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0037] Example 1

[0038] As one embodiment, a method for assembling the negative ring of a large-section shield tunnel for combined road and rail construction includes the following construction steps:

[0039] Step 1: Pour the starting base 21, and install the supporting steel rail 23 in the middle of the starting base 21, the guide steel rail 24 on both sides of the starting base 21, and the reaction frame 22 at the rear end of the starting base 21.

[0040] The tunnel boring machine is assembled segment by segment based on the starting base 21. The tail steel ring 31 is supported on the support rail 23. An anti-rotation bracket 33 is installed between the tail steel ring 31 and the guide rail 24. The arc-shaped clamping plate 35 of the anti-rotation bracket 33 is spot welded to the tail steel ring 31. The support pulley 34 of the anti-rotation bracket 33 is supported on the guide rail 24.

[0041] Step 2: Assemble the guide bearing structure on the ground, then fix the front end of the hydraulic jack 14 to the support steel ring 12 and the rear end of the hydraulic jack 14 to the reaction frame 22; after the guide bearing structure is installed in place, adjust the axial tilt angle of the guide bearing steel ring 11 by controlling the extension and retraction of the hydraulic jack 14 so that it is on the same straight line as the tunnel axis.

[0042] Step 3: Splice the negative ring 51. Transport the negative ring segments 53 into the shield tail steel ring 31. Splice the negative ring segments 53 with the help of the guide bearing steel ring 11. After the negative ring segments 53 are in place, hook the front end of the negative ring segments 53 with the buckle 18 and tighten the tie fixing screw 16 so that the rear end of the negative ring segments 53 is close to the guide bearing steel ring 11. After all the negative ring segments 53 are in place, use the circumferential fastening bolts 54 to fix the adjacent negative ring segments 53 to form the negative ring 51.

[0043] Step 4: Splice the second negative ring 52. Following the method described in Step 4, place the negative ring segments 53 forward from the first negative ring 51. The longitudinal seams of the second negative ring 52 and the first negative ring 51 are staggered. After each negative ring segment 53 of the second negative ring 52 is placed in place, remove the clips 18 at the front end of the tie-fixing screws 16 one by one, add extension screws 19, then install the clips 18, tighten the tie-fixing screws 16, and fix the negative ring segments 53. After all the negative ring segments 53 of the second negative ring 52 are placed in place, use circumferential fastening bolts 54 to fix adjacent negative ring segments 53 to form the second negative ring 52, and use longitudinal fastening bolts 55 to connect and fix the second negative ring 52 to the first negative ring 51.

[0044] Step 5: Push the negative ring 51 out of the shield tail steel ring 31 using the jack 32 inside the shield tail steel ring 31. Then, use the arc-shaped support wedge 41 to support and fix the negative ring 51. The arc-shaped support wedge 41 is symmetrically arranged on both sides of the negative ring 51. Pass the wire rope 44 out from under the negative ring 51 and wrap it around the negative ring 51. Then, use the fastening screw 46 to connect the wire rope connectors 45 at the ends of the two wire ropes 44 together, and tighten the fastening screw 46 to make the wire rope 44 clamp the negative ring tube segment 53.

[0045] Step 6: As described in Step 4, splice the negative ring segments 53 one by one to form a negative ring, and as described in Step 5, push the spliced ​​negative ring out from the shield tail steel ring 31 one by one and fix it until the tunnel boring machine has completely entered the stratum.

[0046] Example 2

[0047] As another embodiment, the negative ring assembly system for a large-section shield tunnel combining road and rail, obtained by the method in Embodiment 1, is as follows: Figures 1 to 11 As shown, it includes a guide bearing structure, a tie-fixing screw 16, a starting base 21, a reaction frame 22, a support rail 23, a guide rail 24, a shield tail steel ring 31, an anti-rotation bracket 33, and an arc-shaped support wedge 41;

[0048] The guiding bearing structure includes a guiding bearing steel ring 11, a supporting steel ring 12, a rubber ring 13, a hydraulic jack 14, and a guide screw 15. The guiding bearing structure is installed on the reaction frame 22 via the hydraulic jack 14. One end of the guide screw 15 is fixed to the guiding bearing steel ring 11, and the other end of the guide screw 15 passes through the rubber ring 13 and exits from the supporting steel ring 12. The rubber ring 13 is sandwiched between the guiding bearing steel ring 11 and the supporting steel ring 12. The rear end of the hydraulic jack 14 is fixed to the reaction frame 22, and the front end of the hydraulic jack 14 is fixed to the supporting steel ring 12. Multiple hydraulic jacks 14 are arranged circumferentially along the supporting steel ring 12.

[0049] The tie-fixing screw 16 is arranged circumferentially along the inner side of the guide bearing steel ring 11. The tie-fixing screw 16 is provided with a fixing sleeve 17. The front end of the tie-fixing screw 16 is provided with a buckle 18. The fixing sleeve 17 is welded and fixed to the guide bearing steel ring 11. An extension screw 19 is also provided between the buckle 18 and the tie-fixing screw 16.

[0050] The reaction frame 22 is cast onto the starting base 21.

[0051] Support rail 23 and guide rail 24 are pre-embedded in the launching base 21.

[0052] The anti-rotation bracket 33 is fixed on both sides of the shield tail steel ring 31 and supported on the guide rail 24. The shield tail steel ring 31 is equipped with a jacking jack 32. The anti-rotation bracket 33 also includes a support pulley 34 and an arc-shaped clamping plate 35. The support pulley 34 is supported on the guide rail 24, and the arc-shaped clamping plate 35 is spot-welded to the outside of the shield tail steel ring 31. Two anti-rotation brackets 33 are symmetrically arranged on both sides along the vertical axis of the shield tail steel ring 31.

[0053] Arc-shaped support wedges 41 are symmetrically arranged below the negative ring formed by splicing the negative ring segments 53. The arc-shaped support wedges 41 are supported on the starting base 21. The arc-shaped support wedges 41 are connected to the guide rail 24 through the limiting groove 42. The two arc-shaped support wedges 41 below the negative ring are wrapped around the negative ring by steel wire ropes 44. The ends of the two steel wire ropes 44 are connected by fastening screws 46.

[0054] When splicing negative ring 2 52, negative ring segments 53 are placed forward from negative ring 1 51, with the longitudinal splices of negative ring 2 52 and negative ring 1 51 staggered. After each negative ring segment 53 of negative ring 2 52 is placed in place, the buckles 18 at the front end of the tie-fixing screw 16 are removed one by one, and the extension screw 19 is added. Then the buckles 18 are installed again, and the tie-fixing screw 16 is tightened to fix the negative ring segments 53. After all the negative ring segments 53 of negative ring 2 52 are placed in place, the adjacent negative ring segments 53 are fixed into a whole ring using circumferential fastening bolts 54, and negative ring 2 52 is connected and fixed to negative ring 1 51 using longitudinal fastening bolts 55.

[0055] The negative ring 51 is pushed out of the shield tail steel ring 31 by the jacking jack 32 inside the shield tail steel ring 31. Then, the negative ring 51 is supported and fixed by the arc-shaped support wedge 41. The arc-shaped support wedge 41 is symmetrically arranged on both sides of the negative ring 51. The wire rope 44 is passed out from under the negative ring 51 and wrapped around the negative ring 51. Then, the wire rope connectors 45 at the ends of the two wire ropes 44 are connected together by the fastening screw 46, and the wire rope 44 is tightened around the negative ring tube segment 53 by the fastening screw 46.

[0056] The arc-shaped support wedge 41 is generally a right triangle with a limiting groove 42 on the horizontal side and an arc-shaped hypotenuse. A steel wire rope 44 is fixed to the front end of the hypotenuse, and a guide groove 43 is provided on the hypotenuse. Two arc-shaped support wedges 41 are symmetrically arranged below the ring-shaped negative ring. The limiting groove 42 is engaged with the guide rail 24. The steel wire ropes 44 on the arc-shaped support wedges 41 pass through the guide grooves 43 on the opposite arc-shaped support wedges 41 and are wound around the negative ring. The ends of the steel wire ropes 44 are provided with steel wire rope connectors 45, and the two steel wire rope connectors 45 are connected by fastening screws 46.

Claims

1. A method for assembling and constructing the negative ring of a large-section shield tunnel combining road and rail, characterized in that, The construction steps include the following: Step 1: Pour the starting base (21) and install the supporting rails (23), guide rails (24) and reaction frame (22); Assemble the tunnel boring machine segment by segment based on the starting base (21), with the tail ring (31) supported on the supporting rails (23), and install the anti-rotation bracket (33) between the tail ring (31) and the guide rails (24); Step 2: Assemble the guide bearing structure, fix the front end of the hydraulic jack (14) to the support steel ring (12), and fix the rear end to the reaction frame (22); adjust the guide bearing steel ring (11) to be on the same straight line as the tunnel; Step 3: Place the negative ring segment (53) inside the shield tail steel ring (31) with the guide bearing steel ring (11) and temporarily fix it with the tie fixing screw (16). Use the circumferential fastening bolt (54) to fix the negative ring segment (53) to form negative ring one (51). Step 4: Remove the tie rods (16) one by one to fix the negative ring segment (53) in front of the negative ring one (51), and after fixing to form the negative ring two (52), connect and fix the negative ring two (52) to the negative ring one (51); Step 5: Push out the negative ring 1 (51) using the jack (32) inside the shield tail steel ring (31), and use the arc-shaped support wedge (41) to support and fix the negative ring 1 (51); Step 6: Repeat the splicing of the negative ring and push it out and fix it until the tunnel boring machine is completely inside the stratum.

2. The method for assembling the negative ring of a large-section shield tunnel for combined road and rail construction according to claim 1, characterized in that, In step one, the launching base (21) is poured, and the supporting rail (23) is installed in the middle of the launching base (21), the guide rail (24) is installed on both sides of the launching base (21), and the reaction frame (22) is installed at the rear end of the launching base (21).

3. The method for assembling the negative ring of a large-section shield tunnel combining road and rail as described in claim 1, characterized in that, In step one, the shield machine is assembled segment by segment based on the starting base (21). The tail steel ring (31) is supported on the support rail (23). The anti-rotation bracket (33) is installed on the tail steel ring (31). The arc-shaped clamping plate (35) of the anti-rotation bracket (33) is spot welded to the tail steel ring (31). The support pulley (34) of the anti-rotation bracket (33) is supported on the guide rail (24).

4. The method for assembling the negative ring of a large-section shield tunnel combining road and rail as described in claim 1, characterized in that, In step two, the guiding bearing structure includes a guiding bearing steel ring (11), a supporting steel ring (12), a rubber ring (13), a hydraulic jack (14), and a guide screw (15). The guiding bearing structure is installed on the reaction frame (22) by the hydraulic jack (14). One end of the guide screw (15) is fixed to the guiding bearing steel ring (11), and the other end of the guide screw (15) passes through the rubber ring (13) and exits from the supporting steel ring (12). The rubber ring (13) is sandwiched between the guiding bearing steel ring (11) and the supporting steel ring (12). The rear end of the hydraulic jack (14) is connected to the reaction frame (22). The force frame (22) is fixed, the front end of the hydraulic jack (14) is fixed to the supporting steel ring (12), and multiple hydraulic jacks (14) are arranged around the supporting steel ring (12). Specifically, the guide bearing structure is assembled on the ground, and then the front end of the hydraulic jack (14) is fixed to the supporting steel ring (12), and the rear end of the hydraulic jack (14) is fixed to the reaction frame (22). After the guide bearing structure is installed in place, the axial tilt angle of the guide bearing steel ring (11) is adjusted by controlling the extension and retraction of the hydraulic jack (14) so ​​that the guide bearing steel ring (11) and the tunnel axis are on the same straight line.

5. The method for assembling the negative ring of a large-section shield tunnel combining road and rail as described in claim 1, characterized in that, In step three, when splicing the negative ring one (51), the negative ring segments (53) are transported to the shield tail steel ring (31). The negative ring segments (53) are spliced ​​with the guide bearing steel ring (11). After the negative ring segments (53) are placed in place, the buckle (18) is hooked onto the front end of the negative ring segments (53), and the tie fixing screw (16) is tightened so that the rear end of the negative ring segments (53) is close to the guide bearing steel ring (11). After all the negative ring segments (53) of the negative ring one (51) are placed in place, the circumferential fastening bolts (54) are used to fix the adjacent negative ring segments (53) to form an integral ring.

6. The method for assembling the negative ring of a large-section shield tunnel combining road and rail as described in claim 1, characterized in that, In step four, when splicing negative ring two (52), negative ring tube segments (53) are placed forward from negative ring one (51), and the longitudinal splices of negative ring two (52) and negative ring one (51) are staggered. After the negative ring tube segments (53) of negative ring two (52) are placed in place one by one, the buckles (18) at the front end of the tie fixing screw (16) are removed one by one, and the extension screw (19) is added. Then the buckles (18) are installed and the tie fixing screw (16) is tightened to fix the negative ring tube segments (53). After all the negative ring tube segments (53) of negative ring two (52) are placed in place, the adjacent negative ring tube segments (53) are fixed to form an integral ring using circumferential fastening bolts (54), and negative ring two (52) is connected and fixed to negative ring one (51) using longitudinal fastening bolts (55).

7. The method for assembling the negative ring of a large-section shield tunnel for combined road and rail construction according to claim 1, characterized in that, In step five, the negative ring one (51) is pushed out from the shield tail steel ring (31) by the jack (32) inside the shield tail steel ring (31), and then the negative ring one (51) is supported and fixed by the arc-shaped support wedge (41). The arc-shaped support wedge (41) is symmetrically arranged on both sides of the negative ring one (51), and the wire rope (44) is passed out from under the negative ring one (51) and wrapped around the negative ring one (51). Then the wire rope connector (45) at the ends of the two wire ropes (44) is connected together by the fastening screw (46), and the wire rope (44) is tightened around the negative ring tube segment (53) by the fastening screw (46).

8. The method for assembling the negative ring of a large-section shield tunnel for combined road and rail construction according to claim 1, characterized in that, Step six specifically involves splicing the negative ring segments (53) section by section according to the method described in step four to form a negative ring, and then, according to the method described in step five, ejecting and fixing the spliced ​​negative ring section by section from the tail steel ring (31) until the tunnel boring machine has completely entered the stratum.

9. A negative ring assembly system for large-section shield tunnels used in combined road and rail construction, characterized in that: Obtained by the method described in any one of claims 1 to 8.

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