Anti-floating shield segment with supporting legs

Abstract

The utility model belongs to the field of metro construction, and particularly relates to an anti-floating shield segment with supporting legs, which comprises an adjacent block segment, a plurality of embedded supporting legs are embedded in the adjacent block segment, each embedded supporting leg comprises a supporting leg sleeve, a water stop plate is welded in the middle of the periphery of each supporting leg sleeve, and anchoring steel bars are welded at two ends of each supporting leg sleeve. Internal threads are arranged on the inner wall of the supporting leg sleeve; the supporting leg sliding column is located in the supporting leg sleeve, the supporting plate is welded to the upper end of the supporting leg sliding column, and the lower end of the supporting leg sliding column is in threaded connection with the bolt. The device further comprises a lead screw which can be screwed into the supporting leg sleeve. The supporting leg embedded parts are additionally arranged, the shield segment with the supporting legs is installed when shield construction is needed, and floating of the shield segment is overcome in cooperation with conventional shield construction.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of subway construction, especially relates to a floating resistance shield segment with supporting leg. BACKGROUND

[0002] In the subway shield construction, when encountering special geology with rich water, the shield segment of the shield tail of the shield machine will float up due to various factors such as construction operation, synchronous grouting and underground water, the tunnel will deviate from the designed position due to the floating of the segment, and problems such as segment misalignment and stress cracks will be caused. At present, in order to overcome the floating of the segment, the coagulation time of the synchronous grouting slurry and the construction method are adjusted, which is difficult to operate and has poor improvement effect. SUMMARY

[0003] The present application solves the problem of overcoming the shortcomings of the background art and provides a floating resistance shield segment with supporting leg.

[0004] The present application is realized by the following technical solutions:

[0005] A floating resistance shield segment with supporting leg, comprising an abutment block segment, a plurality of pre-embedded supporting legs are pre-embedded in the abutment block segment, the pre-embedded supporting leg comprises a supporting leg sleeve, the supporting leg sleeve is pre-embedded in the abutment block segment, a water stop plate is welded at the middle position of the outer periphery of the supporting leg sleeve, anchor steel bars are welded at both ends of the supporting leg sleeve, the anchor steel bars are connected with the steel bars in the abutment block segment, an internal thread is arranged on the inner wall of the supporting leg sleeve from the lower end of the supporting leg sleeve upward, and the length of the internal thread is less than the length of the supporting leg sleeve; a supporting leg sliding column is located in the supporting leg sleeve, a supporting plate is welded at the upper end of the supporting leg sliding column, the curvature of the supporting plate is consistent with the curvature of the outer wall of the abutment block segment, a screw hole is arranged at the center of the lower end of the supporting leg sliding column, a bolt is connected with the screw hole through the internal thread, a check ring and a spring washer are sleeved on the bolt, and the diameter of the check ring is greater than the inner diameter of the supporting leg sleeve; a lead screw is further arranged, and the lead screw can be screwed into the supporting leg sleeve.

[0006] Preferably, a plurality of sealing rubber ring grooves are arranged on the inner wall of the upper part of the supporting leg sleeve, and sealing rubber rings are adhered in the sealing rubber ring grooves.

[0007] Preferably, the length of the internal thread in the supporting leg sleeve is 70% of the length of the supporting leg sleeve.

[0008] Preferably, the supporting leg sliding column is a steel cylinder.

[0009] Preferably, a tool withdrawal groove is arranged in the supporting leg sleeve.

[0010] This invention considers the structure of the tunnel lining segments themselves and adds pre-embedded support legs in adjacent segments. When needed during tunnel construction, tunnel lining segments with support legs are installed to help overcome the floating of tunnel lining segments in conjunction with conventional tunnel construction. This invention has a simple structure, low cost, and convenient installation. Multiple pre-embedded support leg structures can be pre-embedded in adjacent segments according to different geological conditions to cope with working conditions with large buoyancy. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure used in this embodiment;

[0012] Figure 2 This is a schematic diagram of the structure when the pre-embedded support leg is not protruding in this embodiment;

[0013] Figure 3 This is a schematic diagram of the structure after the pre-embedded support leg is pushed out in this embodiment.

[0014] In the diagram, 1 is the standard segment block, 2 is the capping segment block, 3 is the adjacent segment block, 4 is the embedded leg, 5 is the gap, 6 is the leg sliding column, 7 is the support plate, 8 is the sealing ring, 9 is the leg sleeve, 10 is the waterstop plate, 11 is the anchoring steel bar, 12 is the retaining ring, 13 is the spring washer, 14 is the bolt, 15 is the lead screw, and 16 is the relief groove. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0016] Currently, the first ring of shield tunnel segments consists of six pieces, as shown in the attached diagram. Figure 1 As shown, the structure includes three standard segment blocks 1 (Type A) at the bottom, a capping segment block 2 (Type K) at the top, and adjacent segment blocks 3 (Type B) on both sides of the capping segment block, all connected to form a ring. This invention modifies the adjacent segment blocks 3 into segments with pre-embedded support legs 4. The pre-embedded support legs 4 are integrated with the adjacent segment blocks 3 during concrete pouring. When encountering geological conditions that cause segment buoyancy during shield tunneling, adjacent segment blocks 3 with pre-embedded support legs 4 are used. As the segments are assembled into a ring and pushed out of the shield tail, the pre-embedded support legs 4 are pushed out, and grouting is performed simultaneously. During grout solidification, the pre-embedded support legs 4 support the segment's outer wall and the gap 5 created by the shield excavation, bearing the buoyancy of the segment. After the grout solidifies, it forms a stable integral structure with the segment.

[0017] The pre-embedded support leg 4 comprises the following components: a support leg sleeve 9, a support leg slide column 6, a support plate 7, a sealing rubber ring 8, a water stop plate 10, an anchoring steel bar 11, a blocking ring 12, a spring washer 13, a bolt 14, and a lead screw 15. The support leg sleeve 9 is pre-embedded in the adjacent block segment 3, and the water stop plate 10 is welded to the middle position of the outer periphery of the support leg sleeve 9. The water stop plate 10 is a steel plate, which is circular and is fully welded to the support leg sleeve 9 at the root, so as to ensure that the pre-embedded support leg 4 forms a water stop structure in the concrete structure of the adjacent block segment 3. The anchoring steel bars 11 are welded to both ends of the support leg sleeve 9 according to the specification, and are firmly connected with the steel bars in the adjacent block segment 3. Three sealing rubber ring grooves are formed on the inner wall of the upper part of the support leg sleeve 9, and the sealing rubber rings 8 are adhered in the grooves. The internal thread is formed on the inner wall of the support leg sleeve 9 from the lower end of the support leg sleeve 9 upwards, and does not reach the sealing rubber ring 8. In this embodiment, the length of the internal thread of the support leg sleeve 9 is 70% of the total length of the support leg sleeve 9.

[0018] The support leg slide column 6 is located in the support leg sleeve 9, and is a steel cylinder which can slide in the support leg sleeve 9. The support plate 7 is welded to the upper end of the support leg slide column 6, and the curvature of the support plate 7 is consistent with the curvature of the outer wall of the adjacent block segment 3, so as to ensure that the adjacent block segment 3 does not interfere with the shield tail brush when the adjacent block segment 3 is assembled. The screw hole is arranged at the center of the lower end of the support leg slide column 6, and the bolt 14 is screwed into the screw hole. The blocking ring 12 and the spring washer 13 are sleeved on the bolt 14. The diameter of the blocking ring 12 is greater than the inner diameter of the support leg sleeve 9, and the blocking ring 12 is in close contact with the inner wall of the adjacent block segment 3. During the transportation and assembly of the adjacent block segment 3, the bolt 14, the spring washer 13 and the blocking ring 12 can be used to temporarily fix the support leg slide column 6 and the support plate 7.

[0019] The lead screw 15 can be screwed into the support leg sleeve 9. When the adjacent block segment 3 provided with the pre-embedded support leg 4 is assembled into a ring at the tail of the shield machine and is pushed out of the tail of the shield machine, the bolt 14, the spring washer 13 and the blocking ring 12 at one end of the support leg slide column 6 are removed, the lead screw 15 is screwed into the support leg sleeve 9 and is continuously rotated, the lead screw 15 pushes the support leg slide column 6 and the support plate 7 upwards, and the support plate 7 is finally pushed to the excavation surface. During this process, the shield construction is synchronously grouted, and the support leg slide column 6 and the support plate 7 are supported in the gap 5 between the outer wall of the segment and the excavation gap of the shield during the solidification of the grout, and bear the upward floating force of the segment. After the grout is solidified, a stable overall structure is formed between the segment and the grout, and the lead screw 15 is not removed during the solidification of the grout. After the grout is solidified, the lead screw 15 can be reused by being unscrewed, and the support leg sleeve 9 is filled with quick-drying cement mortar and is compacted. A tool withdrawal groove 16 can be arranged in the support leg sleeve 9, and the lead screw 15 can be rotated to the maximum extent in the tool withdrawal groove 16 in the support leg sleeve 9. At this time, the support leg slide column 6 is in the maximum extension state. Under normal circumstances, the gap 5 between the outer wall of the adjacent block segment 3 and the excavation surface of the shield is smaller than the maximum extension of the support leg slide column 6.

[0020] It should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same. Those skilled in the art should understand that the technical solutions recorded in the above examples can still be modified, or some technical features can be replaced by equivalent features. Such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A floating-resistant shield tunnel segment with legs, comprising an abutment block tunnel segment (3), characterized in that: The abutment block pipe piece (3) is embedded with a plurality of embedded legs (4), the embedded leg (4) includes a leg sleeve (9), the leg sleeve (9) is embedded in the abutment block pipe piece (3), a water stop plate (10) is welded to the middle position of the outer periphery of the leg sleeve (9), anchor steel bars (11) are welded to both ends of the leg sleeve (9), the anchor steel bars (11) are connected with the steel bars in the abutment block pipe piece (3), an internal thread is arranged on the inner wall of the leg sleeve (9) from the lower end of the leg sleeve (9) upward, and the length of the internal thread is less than the length of the leg sleeve (9); a leg sliding column (6) is located in the leg sleeve (9), a support plate (7) is welded to the upper end of the leg sliding column (6), the curvature of the support plate (7) is consistent with the curvature of the outer wall of the abutment block pipe piece (3), a screw hole is arranged at the center of the lower end of the leg sliding column (6), a bolt (14) is screw-connected in the screw hole, a check ring (12) and a spring washer (13) are sleeved on the bolt (14), and the diameter of the check ring (12) is greater than the inner diameter of the leg sleeve (9); and a lead screw is further arranged, the lead screw (15) can be screwed into the leg sleeve (9).

2. The belled anti-float shield tunnel segment of claim 1, wherein: A plurality of sealing rubber ring grooves are arranged on the inner wall of the upper portion of the leg sleeve (9), and sealing rubber rings (8) are adhered in the sealing rubber ring grooves.

3. The belled anti-float shield tunnel segment of claim 1, wherein: The length of the internal thread of the leg sleeve (9) is seven-tenths of the length of the leg sleeve (9).

4. The belled anti-float shield tunnel segment of claim 1, wherein: The leg sliding column (6) is a steel cylinder.

5. The belled anti-float shield tunnel segment of claim 1, wherein: A tool withdrawal groove (16) is arranged in the leg sleeve (9).

Images