A non-contact box culvert jacking method for the roof slab

Abstract

The present application discloses a non-contact top plate box culvert jacking method, which includes the following steps: S1, installing a shield system at the front end of the box culvert; S2, setting a capping member at the top of the shield system so that the upper surface of the capping member is flush with the top end face of the box culvert; S3, installing a drag reduction system, the drag reduction system includes a drum arranged in the shield system, an isolation steel plate wound around the outside of the drum, a tail fixing arranged at the tail end of the roadbed, and a grease applicator for applying grease to both surfaces of the isolation steel plate, and the end of the isolation steel plate away from the drum is laid on the top of the capping member and the box culvert and then connected to the tail fixing; S4, installing the jacking system; S5, jacking the box culvert, during the jacking process of the box culvert, the drum continuously releases the isolation steel plate to isolate the box culvert from the roadbed excavation surface. The present application has the effect of reducing the situation in which the soil of the roadbed excavation surface moves with the box culvert during the jacking construction of the box culvert, and avoiding secondary disturbance of the soil of the roadbed excavation surface.

Description

Technical Field

[0001] The invention relates to the field of box culvert jacking construction, and in particular to a top plate non-contact box culvert jacking construction method. Background Art

[0002] As a widely used underpass construction technology, box culvert jacking is a construction method that uses jacking, pulling or a combination of jacking and pulling to push the culvert box into the roadbed while ensuring the operation of the existing line.

[0003] During the jacking process of the box culvert, the top of the box culvert will directly contact the soil of the roadbed excavation surface, which can easily cause a large jacking resistance of the box culvert. To solve this problem, the conventional method is to apply lubricating grease on the outside of the box culvert.

[0004] However, while reducing the resistance during the box culvert jacking process in this way, the box culvert cannot be effectively isolated from the roadbed excavation surface. As a result, during the box culvert jacking process, the soil on the roadbed excavation surface moves with the box culvert, causing secondary disturbance to the soil on the roadbed excavation surface. Summary of the invention

[0005] In order to avoid secondary disturbance to the soil at the roadbed excavation surface, the present application provides a box culvert jacking method with a non-contact top plate.

[0006] The present application provides a non-contact top plate box culvert jacking method using the following technical solutions:

[0007] A top plate non-contact box culvert jacking method comprises the following steps:

[0008] S1. Install the shield system at the front end of the box culvert;

[0009] S2. A capping member is installed at the top of the shield system so that the upper surface of the capping member is flush with the top end surface of the box culvert;

[0010] S3. Install a drag reduction system, which includes a drum installed in the shield system, an isolation steel plate wound around the outside of the drum, a tail fixing provided at the tail end of the roadbed, and a grease applicator for applying grease to both surfaces of the isolation steel plate. The end of the isolation steel plate facing away from the drum is laid above the capping member and the box culvert and then connected to the tail fixing;

[0011] S4. Install the jacking system;

[0012] S5. During the box culvert jacking process, the drum continuously releases the isolation steel plate to isolate the box culvert from the roadbed excavation surface.

[0013] Preferably, in step S3, the isolation steel plate is laid on top of the capping member and the box culvert immediately following the tunneling blade of the shield system.

[0014] Preferably, the tail fixing member is a fixing frame anchored to the tail end of the roadbed.

[0015] Preferably, in step S3, the isolation steel plate is welded and fixed to the fixing frame.

[0016] Preferably, the jacking system includes a plurality of hydraulic oil jacks arranged at intervals and force transmission columns corresponding to the hydraulic oil jacks one by one.

[0017] Preferably, the capping member is a roof plate laid on the top of the shield system.

[0018] Preferably, the capping member includes a plurality of cover plates arranged at intervals along the jacking direction of the box culvert on the top of the shield system and roller shafts arranged between adjacent cover plates. A spring for applying a vertically upward acting force to the roller shafts to press the isolation steel plate against the roadbed tunneling face is provided on the shield system;

[0019] A number of grouting holes are arranged on the isolation steel plate, and a relief opening for the grouting pipe to pass through is opened on the cover plate.

[0020] Preferably, the capping member further includes a support shell arranged below the roller shaft. The roller shaft is rotatably connected to the support shell, and the bottom end of the support shell is fixed to the top end of the spring.

[0021] Preferably, a dynamic sealing ring for sealing the contact surface between the support shell and the cover plate is provided.

[0022] Preferably, the capping member further includes a jacking hydraulic cylinder fixed to the shield system. The top end of the jacking hydraulic cylinder is used to abut against the support shell to apply a vertically upward acting force to the support shell.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The setting of the isolation steel plate isolates the box culvert from the roadbed tunneling face, effectively isolating the direct contact between the box culvert and the roadbed tunneling face, thereby reducing the situation that the soil on the roadbed tunneling face moves with the box culvert during the box culvert jacking construction, avoiding secondary disturbance to the soil on the roadbed tunneling face, and ensuring the integrity and stability of the roadbed tunneling face.

[0025] 2. During the continuous forward propulsion of the shield system, when the tunneling face is uneven, the spring applies a vertically upward acting force to the roller shaft, causing the roller shaft to press against the isolation steel plate above it, and pushing the isolation steel plate to fit the uneven tunneling face, ensuring the fitting effect between the isolation steel plate and the tunneling face;

[0026] When the isolation steel plate abuts tightly against the tunneling face, grout is injected between the isolation steel plate and the tunneling face. After the grout solidifies, a whole is formed between the tunneling face and the isolation steel plate, effectively improving the bonding strength between the isolation steel plate and the uneven tunneling face.

[0027] 3. The setting of the support shell provides a foundation for the roller shaft and realizes the connection between the roller shaft and the spring; the setting of the dynamic sealing ring ensures the sealing performance of the contact surface between the support shell and the cover plate.

[0028] 4. When injecting grout between the isolation steel plate and the tunneling face, the pushing hydraulic cylinder applies a force to the roller shaft to prevent the isolation steel plate from separating from the tunneling face due to the pressure on the isolation steel plate before the grout solidifies after grouting. Description of the Drawings

[0029] Figure 1 It is an overall schematic diagram showing the non-contact box culvert jacking structure of the top plate in the first embodiment of the present application.

[0030] Figure 2 It is Figure 1 A partial enlarged schematic diagram of part A in

[0031] Figure 3 It is Figure 1 A partial enlarged schematic diagram of part B in

[0032] Figure 4 It is a partial schematic diagram showing the non-contact box culvert jacking structure of the top plate in the second embodiment of the present application.

[0033] Figure 5 It is Figure 4 A partial enlarged schematic diagram of part C in

[0034] Description of the Reference Numerals:

[0035] 1. Box culvert; 2. Shield system; 3. Top plate; 4. Drag reduction system; 41. Reel; 411. Spool; 412. Motor; 42. Isolation steel plate; 43. Grease applicator; 44. Tail fixing part; 441. Temporary positioning buckle; 5. Jacking system; 51. Hydraulic oil jack; 6. Tunneling face; 71. Cover plate; 711. Extended vertical plate; 72. Roller shaft; 73. Support shell; 74. Dynamic sealing strip; 75. Spring; 76. Pushing hydraulic cylinder. Detailed Description of the Embodiments

[0036] The following will further elaborate on the present application in conjunction with the attached Figures 1-5 drawings.

[0037] The embodiments of the present application disclose a non-contact box culvert jacking method for the top plate.

[0038] Embodiment 1

[0039] Combined with Figures 1 to 3 , a non-contact box culvert jacking construction method for the top plate, comprising the following steps:

[0040] S1. Installation of the shield system 2:

[0041] Install the shield system 2 at the front end of the box culvert 1 and debug the shield to ensure smooth telescoping without jamming within the shield stroke.

[0042] S2. Laying of the capping member at the top of the shield system 2:

[0043] In this embodiment, the capping member includes a top plate 3 covering the top of the shield system 2, and the upper surface of the top plate 3 is flush with the top end face of the box culvert 1.

[0044] S3. Installation of the resistance reduction system 4:

[0045] Install the resistance reduction system 4 to reduce the resistance during the jacking of the box culvert 1 and effectively isolate the box culvert 1 from the roadbed tunneling face 6.

[0046] The resistance reduction system 4 includes a reel 41 fixed in the telescopic frame of the shield system 2, an isolation steel plate 42 wound around the reel 41, a tail fixing member 44 fixed at the tail end of the roadbed, and a grease applicator 43.

[0047] There are two groups of grease applicators 43 on the inner and outer sides of the isolation steel plate 42. The grease applicator 43 is used to apply grease to the inner and outer sides of the isolation steel plate 42 to further reduce the jacking resistance of the box culvert 1.

[0048] The reel 41 includes a reel shaft 411 and a motor 412 for driving the reel shaft 411 to rotate. One end of the isolation steel plate 42 is fixed outside the reel shaft 411, and the other end is laid above the capping member and the box culvert 1 following behind the tunneling cutter of the shield system 2, and the end of the end laid above the shield system 2 and the box culvert 1 is connected and fixed to the tail fixing member 44 to limit and position the tail end of the isolation steel plate 42.

[0049] In this embodiment, the tail fixing member 44 is a fixing frame anchored to the roadbed, and the isolation steel plate 42 is fixed to the fixing frame by welding. In other embodiments, the tail fixing member 44 can also be set to other structures as long as it can provide a connection foundation for the tail end of the isolation steel plate 42.

[0050] The fixing frame is also provided with temporary positioning buckles 441, and a plurality of temporary positioning buckles 441 are longitudinally distributed evenly. The isolation steel plate 42 first passes through the temporary positioning buckles 441 on the fixing frame for temporary positioning, and then the tail end of the isolation steel plate 42 is welded to reduce the welding difficulty.

[0051] S4. Installation of the jacking system 5:

[0052] Install a jacking system 5 at the tail end of the box culvert 1. The jacking system 5 includes multiple hydraulic jacks 51 arranged at intervals and a thrust column for filling the distance between the output end of the hydraulic jack 51 and the tail end of the box culvert 1. When the hydraulic jack 51 reaches its maximum stroke, force is transmitted through the thrust column, which is not shown in the drawings.

[0053] S5. Jacking of the box culvert 1:

[0054] Jack the box culvert 1 through the jacking system 5. During the jacking process of the box culvert 1, the winding drum 41 continuously releases the isolation steel plate 42, and the isolation steel plate 42 is continuously laid on the capping member at the top of the shield system 2 and above the box culvert 1, effectively isolating the box culvert 1 from the subgrade excavation face 6, thereby reducing the occurrence of the situation where the soil mass on the subgrade excavation face 6 moves along with the box culvert 1 during the jacking construction of the box culvert 1 and avoiding secondary disturbance to the soil mass on the subgrade excavation face 6.

[0055] Embodiment 2

[0056] Combined with Figures 4 to 5 , a box culvert jacking method with a non-contact roof slab, which is different from Embodiment 1 in that the capping member in step S2 of this embodiment includes a plurality of cover plates 71 arranged at intervals along the jacking direction of the shield system 2 at the top of the shield system 2 and roller shafts 72 arranged between adjacent cover plates 71.

[0057] Support shells 73 corresponding to the roller shafts 72 one by one are provided on the shield system 2. The two sides of the support shell 73 are in contact with the two sides of adjacent cover plates 71. The contact surface between the support shell 73 and the cover plate 71 is sealed by a dynamic sealing strip 74. The roller shaft 72 is rotatably connected to the top of the support shell 73.

[0058] The specific connection method between the support shell 73 and the cover plate 71 is that an extended vertical plate 711 extends downward from the cover plate 71, and the sealing strip 74 also extends downward to the bottom end of the extended vertical plate 711, and the inner wall of the sealing strip 74 is in close contact with the support shell 73.

[0059] The capping member further includes a spring 75 for applying a vertically upward force to the support shell 73 and a jacking hydraulic cylinder 76 for pushing the support shell 73 upward.

[0060] Then, during the continuous forward propulsion of the shield system 2, if the excavation face 6 is uneven, the spring 75 applies an upward force to the roller shaft 72, causing the roller shaft 72 to press against the isolation steel plate 42 and pushing the isolation steel plate 42 to fit the excavation face 6.

[0061] A plurality of grouting holes are formed in the isolation steel plate 42, and a relief opening for the grouting pipe to pass through is formed in the cover plate 71. When the isolation steel plate 42 is pressed against and attached to the tunneling face 6 under the action of the roller shaft 72, grouting is carried out between the isolation steel plate 42 and the tunneling face 6 through the grouting pipe and the grouting holes, so that an integral body is formed between the isolation steel plate 42 and the tunneling face 6, ensuring the bonding strength between the isolation steel plate 42 and the tunneling face 6. Among them, the relief opening, the grouting pipe and the grouting holes are prior arts and are not shown in the drawings.

[0062] When grouting between the isolation steel plate 42 and the tunneling face 6, the jacking hydraulic cylinder 76 applies a force to the roller shaft 72 to prevent the pressure on the isolation steel plate 42 after grouting from reducing the bonding degree between the isolation steel plate 42 and the tunneling face 6.

[0063] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A non-contact jacking method for a culvert (1) with a top plate (3), characterized in that, The following steps are involved: S1, installing the shield system (2) at the front end of the box culvert (1); S2. A capping member is provided at the top of the shield system (2), so that the upper surface of the capping member is flush with the top end surface of the box culvert (1); The capping member comprises a plurality of cover plates (71) arranged at intervals at the top of the shield system (2) along the jacking direction of the box culvert (1) and a roller shaft (72) arranged between adjacent cover plates (71); the shield system (2) is provided with a spring (75) for applying a vertical upward force to the roller shaft (72) so that the roller shaft (72) presses the isolation steel plate (42) against the roadbed excavation surface (6); The isolation steel plate (42) is provided with a plurality of grouting holes, and the cover plate (71) is provided with a clearance opening for the grouting pipe to pass through; S3, installing a drag reduction system (4), the drag reduction system (4) comprising a drum (41) arranged in the shield system (2), an isolation steel plate (42) wound around the outside of the drum (41), a tail fixing member (44) arranged at the tail end of the roadbed, and a grease applicator (43) for applying grease to both surfaces of the isolation steel plate (42), the end of the isolation steel plate (42) facing away from the drum (41) being laid above the capping member and the box culvert (1) and then connected to the tail fixing member (44); S4, installing the jacking system (5); S5. The box culvert (1) is pushed forward. During the pushing forward process of the box culvert (1), the drum (41) continuously releases the isolation steel plate (42), thereby isolating the box culvert (1) from the roadbed excavation surface (6).

2. A non-contact jacking method for a culvert (1) with a top plate (3) according to claim 1, characterized in that: In step S3, the isolation steel plate (42) is laid on the top of the capping member and the box culvert (1) immediately following the tunneling blade of the shield system (2).

3. A non-contact jacking method for a culvert (1) with a top plate (3) according to claim 1, characterized in that: The tail fixing member (44) is a fixing frame anchored at the tail end of the roadbed.

4. A non-contact jacking method for a culvert (1) with a top plate (3) as claimed in claim 3, characterized in that: In step S3, the isolation steel plate (42) is welded and fixed to the fixing frame.

5. A non-contact jacking method for a culvert (1) with a top plate (3) according to claim 1, characterized in that: The jacking system (5) comprises a plurality of hydraulic oil jacks (51) arranged at intervals and force transmission columns corresponding one to one with the hydraulic oil jacks (51).

6. A non-contact jacking method for a culvert (1) with a top plate (3) according to claim 1, characterized in that: The capping member is a top plate (3) laid on the top of the shield system (2).

7. A non-contact jacking method for a culvert (1) with a top plate (3) according to claim 1, characterized in that: The capping member also includes a support shell (73) disposed below the roller shaft (72); the roller shaft (72) is rotatably connected to the support shell (73); and the bottom end of the support shell (73) is fixed to the top end of the spring (75).

8. A non-contact jacking method for a culvert (1) with a top plate (3) according to claim 7, characterized in that: A dynamic sealing ring is provided between the support shell (73) and the cover plate (71) for sealing the contact surfaces between the two.

9. A non-contact jacking method for a culvert (1) with a top plate (3) according to claim 7, characterized in that: The capping member also includes a push hydraulic cylinder (76) fixed to the shield system (2), and the top end of the push hydraulic cylinder (76) is used to abut against the support shell (73) to apply a vertical upward force to the support shell (73).

Images