Large-diameter shield tunnel composite structure

Abstract

The utility model discloses a large-diameter shield tunnel composite structure which comprises a prefabricated segmental lining, a prefabricated box culvert located at the bottom is arranged in the prefabricated segmental lining, the two side top faces of the prefabricated box culvert are both connected with locking foot longitudinal connection beams, and arch wall linings are arranged on the two locking foot longitudinal connection beams. A reinforced concrete internal structure which is closed in the circumferential direction and continuous in the longitudinal direction is formed on the inner side of the prefabricated segmental lining, so that the structural longitudinal rigidity, the overall stability and the waterproof effect of the large-diameter shield tunnel are effectively improved; the large-diameter shield tunnel structure can be widely applied to large-diameter shield tunnel engineering built in complex environments such as soft soil unfavorable geology, high water pressure, underwater riverbed erosion and deposition change and high seismic intensity, the overall rigidity, longitudinal stability and waterproof sealing performance of a large-diameter shield tunnel are effectively improved, and meanwhile the large-diameter shield tunnel structure has the advantages of being high in mechanization degree, good in integrity, controllable in construction quality and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield tunnels, and in particular relates to a large-diameter shield tunnel composite structure. Background Art

[0002] As the scale of national infrastructure construction continues to expand, shield tunnel projects are constantly developing towards ultra-large cross-sections, ultra-long distances, and ultra-high water pressures. There are more and more large-diameter shield tunnel projects crossing rivers and seas. Such projects often face more complex and changeable geological conditions and external environments, which put forward higher requirements on the safety and stability of large-diameter shield tunnel structural systems.

[0003] In recent years, the installation of secondary linings in long and large tunnel projects constructed by shield method in soft soil and underwater environment has become increasingly common. Secondary lining is a structural measure to improve the overall stability and longitudinal stiffness of the tunnel when the shield tunnel passes through earthquake-prone, water-rich soft strata, and deep underwater environment.

[0004] Therefore, providing a large-diameter shield tunnel composite structure system and construction method with safe and reliable structure, good integrity and high degree of mechanized construction is of great significance to further improve the shield tunnel construction technology. Utility Model Content

[0005] The utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide a large-diameter shield tunnel composite structure and a construction method.

[0006] The technical solution of the utility model is: a large-diameter shield tunnel composite structure, including a prefabricated segment lining, a prefabricated box culvert located at the bottom is arranged in the prefabricated segment lining, the two side top surfaces of the prefabricated box culvert are connected to the locking foot longitudinal connecting beams, and the two locking foot longitudinal connecting beams are provided with arch wall linings.

[0007] Furthermore, a prefabricated box culvert bottom arc plate is formed at the bottom of the prefabricated box culvert, and an installation adjustment gap is arranged between the prefabricated box culvert bottom arc plate and the prefabricated pipe segment lining.

[0008] Furthermore, the cross-sectional profile of the arch wall lining is in the shape of an arc, and the arc is a major arc that is vertically symmetrical.

[0009] Furthermore, a post-cast concrete superposition layer is arranged between the upper side surface of the prefabricated box culvert and the opposite sides of the two locking foot longitudinal connecting beams.

[0010] Furthermore, the prefabricated box culvert is a three-hole and two-span box-type structure, and the prefabricated box culvert includes an upper side surface located at the top, two side top surfaces obliquely intersecting the upper side surface, and a prefabricated box culvert bottom arc plate connecting the two side top surfaces, and the two side top surfaces are symmetrical on the left and right.

[0011] Furthermore, a box culvert steel bar connector is provided in the upper side surface, and the box culvert steel bar connector in the upper side surface is used to be connected to the post-cast concrete superposition layer.

[0012] Furthermore, a box culvert steel bar connector is provided in the side top surface, and the box culvert steel bar connector in the side top surface is used to be connected to the locking foot longitudinal connecting beam.

[0013] Furthermore, an installation adjustment gap is formed between the prefabricated box culvert bottom arc plate and the prefabricated segment lining, and the installation adjustment gap is filled by pouring to achieve the fixation of the prefabricated box culvert bottom arc plate and the prefabricated segment lining.

[0014] The beneficial effects of the utility model are as follows:

[0015] The utility model forms an annularly closed and longitudinally continuous reinforced concrete internal structure on the inner side of the prefabricated segment lining, which effectively improves the structural longitudinal stiffness, overall stability and waterproof effect of the large-diameter shield tunnel. It can be widely used in large-diameter shield tunnel projects constructed in complex environments such as soft soil and poor geology, high water pressure, underwater riverbed scouring and siltation changes, and high earthquake intensity. It effectively improves the overall stiffness, longitudinal stability and waterproof sealing performance of the large-diameter shield tunnel, and at the same time has the advantages of high degree of mechanization, good integrity, and controllable construction quality.

[0016] The utility model prefabricated box culvert adopts an integral three-hole box structure, and is provided with locking foot longitudinal connecting beams and cast-in-place concrete superposition layers. The internal structure construction has a high degree of mechanization and good integrity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a structural stereogram of the prefabricated box culvert in the utility model;

[0019] Figure 3 It is a structural schematic diagram of the prefabricated segment lining in the utility model;

[0020] Figure 4 It is a connection diagram of the locking foot longitudinal connecting beam in the utility model;

[0021] Figure 5 This is a connection diagram of the pipe segment steel bar connector of the utility model;

[0022] in:

[0023] 1 Precast segment lining 2 Arch wall lining

[0024] 3 Prefabricated box culvert 4 Locking foot longitudinal connection beam

[0025] 5 Post-cast concrete overlay 6 Segment steel bar connector

[0026] 7 Arch wall lining annular main reinforcement 8 Prefabricated box culvert bottom arc plate

[0027] 9 Hollow cavity 10 Grouting hole

[0028] 11 Vent hole 12 Box culvert steel bar connector

[0029] 13 Longitudinal bolts. DETAILED DESCRIPTION

[0030] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0031] like Figures 1 to 5 As shown, a large-diameter shield tunnel composite structure includes a prefabricated segment lining 1, in which a prefabricated box culvert 3 located at the bottom is arranged, and the two side top surfaces of the prefabricated box culvert 3 are connected to the locking foot longitudinal connecting beams 4, and the two locking foot longitudinal connecting beams 4 are provided with arch wall linings 2.

[0032] A prefabricated box culvert bottom arc plate 8 is formed at the bottom of the prefabricated box culvert 3 , and an installation adjustment gap is set between the prefabricated box culvert bottom arc plate 8 and the prefabricated pipe segment lining 1 .

[0033] The cross-sectional profile of the arch wall lining 2 is in the shape of an arc, and the arc is a major arc that is vertically symmetrical.

[0034] A post-cast concrete superposition layer 5 is arranged between the upper side surface of the prefabricated box culvert 3 and the opposite sides of the two locking foot longitudinal connecting beams 4 .

[0035] The prefabricated box culvert 3 is a three-hole and two-span box-type structure. The prefabricated box culvert 3 includes an upper side surface located at the top, two side top surfaces obliquely intersecting the upper side surface, and a prefabricated box culvert bottom arc plate 8 connecting the two side top surfaces. The two side top surfaces are symmetrical.

[0036] A box culvert steel bar connector 12 is provided in the upper side surface, and the box culvert steel bar connector 12 in the upper side surface is used to be connected to the post-cast concrete superposition layer 5 .

[0037] A box culvert steel bar connector 12 is provided in the side top surface, and the box culvert steel bar connector 12 in the side top surface is used to be connected with the locking foot longitudinal connecting beam 4.

[0038] An installation adjustment gap is formed between the prefabricated box culvert bottom arc plate 8 and the prefabricated segment lining 1, and the installation adjustment gap is filled by pouring to achieve the fixation of the prefabricated box culvert bottom arc plate 8 and the prefabricated segment lining 1.

[0039] Specifically, adjacent connection structures are provided between the prefabricated box culverts 3 .

[0040] More specifically, a reserved through hole is provided in the upper side surface of the prefabricated box culvert 3, and a threaded hole is provided at the side wall of the adjacent prefabricated box culvert 3. The longitudinal bolt 13 passes through the reserved through hole and is screwed into the threaded hole, thereby connecting the two connected prefabricated box culverts 3 into a whole.

[0041] Specifically, the box culvert steel bar connectors 12 in the upper side are evenly arranged, so as to facilitate fixation with the post-cast concrete superposition layer 5. The post-cast concrete superposition layer 5 needs to be laid with a steel mesh before the pouring process. The steel mesh is connected to the prefabricated box culvert 3 through the box culvert steel bar connector 12. After the post-cast concrete superposition layer 5 is poured, the post-cast concrete superposition layer 5 and the prefabricated box culvert 3 are connected.

[0042] Specifically, the box culvert steel bar connector 12 in the top side surface is arranged on a side close to the prefabricated box culvert bottom arc plate 8 .

[0043] Preferably, the box culvert steel bar connectors 12 in the top side surface are arranged in double rows, and the box culvert steel bar connectors 12 in the top side surface form a ring with the annular main reinforcement 7 of the arch wall lining 2 .

[0044] Specifically, a segment steel bar connector 6 is provided at the inner wall of the prefabricated segment lining 1 , and the segment steel bar connector 6 is used for positioning, installing and fitting and fixing the steel bars of the arch wall lining 2 .

[0045] The steel bars in the arch wall lining 2 are connected to the box culvert steel bar connectors 12 in the prefabricated box culvert 3 in the ring direction to form a ring.

[0046] Specifically, the prefabricated box culvert 3 includes three holes, and the three holes include side holes on both sides and a middle hole located in the center.

[0047] A grouting hole 10 is provided in the prefabricated box culvert bottom arc plate 8 of the side hole, and the grouting hole 10 is used to pour into the installation adjustment gap between the prefabricated box culvert bottom arc plate 8 and the prefabricated pipe segment lining 1; an exhaust hole 11 is also provided in the prefabricated box culvert bottom arc plate 8, and the exhaust hole 11 is used for exhaust during the pouring process.

[0048] Specifically, a local protrusion is formed on the arc-shaped outer wall of the prefabricated box culvert bottom arc plate 8, and the protrusion is used to form an installation adjustment gap.

[0049] Specifically, a hollow cavity 9 is provided in the bottom arc plate 8 of the prefabricated box culvert of the middle hole. The hollow cavity 9 is strip-shaped and can also be used for installation and gap casting.

[0050] Specifically, the locking foot longitudinal connecting beam 4 includes a top side surface, a vertical side surface, an assembly surface and a curved surface, which are enclosed by the above surfaces. The top side surface is parallel to the post-cast concrete superposition layer 5, and the vertical side surface is perpendicular to the post-cast concrete superposition layer 5. In other words, the post-cast concrete superposition layer 5 is arranged between the two vertical side surfaces, the assembly surface is in contact with the top side surface of the prefabricated box culvert 3, and the curved surface is in contact with the prefabricated pipe segment lining 1.

[0051] Specifically, the locking foot longitudinal connecting beam 4 is provided with annular main reinforcements 7 of the arch wall lining, and the annular main reinforcements 7 of the arch wall lining are formed into a ring in unison with the annular main reinforcements 7 of the arch wall lining 2 .

[0052] Specifically, the locking foot longitudinal connecting beam 4 is located at the connection position between the bottom of the arch wall lining 2 and the prefabricated box culvert 3; the post-cast concrete superposition layer 5 is located between the upper side of the prefabricated box culvert 3 and the locking foot longitudinal connecting beam 4; the prefabricated box culvert 3 and the arch wall lining 2 form a ring-shaped closed structure as a whole through the locking foot longitudinal connecting beam 4. The prefabricated box culvert 3 is formed as a whole along the longitudinal direction through the locking foot longitudinal connecting beam 4 and the post-cast concrete superposition layer 5, ensuring the longitudinal overall rigidity and stability of the lower structure.

[0053] Specifically, the annular reinforcement in the arch wall lining 2 is anchored into the locking foot longitudinal connecting beam 4, and the annular construction joint is aligned with the annular joint of the segment lining.

[0054] Specifically, the prefabricated box culvert 3 is an annular integral structure, and its longitudinal length is consistent with or slightly smaller than the ring width of the pipe segment.

[0055] Specifically, two adjacent prefabricated box culverts 3 are connected in the longitudinal direction by longitudinal bolts 13, and rubber adjustment and force transmission pads are arranged between the annular seams.

[0056] Specifically, the bottom arc plate 8 of the prefabricated box culvert 3 is in the shape of an arc concentric with the inner surface of the shield segment, and an installation adjustment gap is reserved between the bottom arc plate 8 and the inner surface of the shield segment.

[0057] Specifically, the prefabricated box culvert 3 uses self-compacting grouting material to fill the gap between the prefabricated box culvert and the inner surface of the shield segment.

[0058] Specifically, the locking foot longitudinal connecting beam 4 is arranged to penetrate the tunnel longitudinally and is constructed by cast-in-place.

[0059] Specifically, the post-cast concrete superposition layer 5 has a steel mesh built in, and both ends of the steel bars are anchored into the locking foot longitudinal connecting beam 4, and cast-in-place construction is adopted.

[0060] A construction method for a large-diameter shield tunnel composite structure comprises the following steps:

[0061] A. Prefabricate and process a prefabricated box culvert 3, and pre-embed the box culvert steel bar connector 12;

[0062] B. As the prefabricated segment lining 1 is assembled, the prefabricated box culvert 3 is assembled simultaneously;

[0063] C. Fill the installation adjustment gap between the prefabricated segment lining 1 and the assembled prefabricated box culvert 3;

[0064] D. Tie the steel bars of the locking foot longitudinal connecting beam 4 and construct the locking foot longitudinal connecting beam 4;

[0065] E. Tie up the steel bars of the arch wall lining 2 and construct the arch wall lining 2;

[0066] F. Repeat steps A to E to complete the construction of prefabricated segment lining, arch wall lining 2, prefabricated box culvert 3 and locking foot longitudinal connecting beam 4 in the shield tunnel;

[0067] G. After construction, pour the concrete overlay layer 5 to complete the construction.

[0068] The length in step A is not greater than the width of the tunnel segment ring.

[0069] Specifically, step A prefabricates the prefabricated box culvert 3 and pre-buries the box culvert steel bar connector 12. The specific process is as follows:

[0070] First, a prefabricated box culvert 3 is produced in the factory;

[0071] Then, the longitudinal length of the prefabricated box culvert 3 is consistent with the ring width of the prefabricated segment lining 1 or slightly smaller than the ring width of the prefabricated segment 1;

[0072] Then, rough surface treatment is performed on the upper side surface and the side top surface of the prefabricated box culvert 3;

[0073] Finally, the box culvert steel bar connectors 12 are embedded in the upper side surface and the side top surface of the prefabricated box culvert 3 .

[0074] Specifically, in step B, as the prefabricated segment lining 1 is assembled, the prefabricated box culvert 3 is assembled simultaneously. The specific process is as follows:

[0075] First, the shield tunneling operation is carried out;

[0076] Then, during the excavation process, immediately after assembling the prefabricated segment lining 1, the prefabricated box culvert 3 is assembled synchronously;

[0077] Then, align the circumferential assembly joint of the prefabricated box culvert 3 with the circumferential joint of the prefabricated segment lining 1;

[0078] Finally, the prefabricated box culverts 3 are longitudinally connected by annular bolts 13 to connect adjacent prefabricated box culverts 3 .

[0079] Specifically, step C is to fill the installation adjustment gap between the prefabricated segment lining 1 and the assembled prefabricated box culvert 3, and the specific process is as follows:

[0080] First, pour self-compacting concrete from the hollow cavity 9 in the bottom arc plate 8 of the prefabricated box culvert to fill the installation adjustment gap between the contact surface of the prefabricated box culvert 3 and the prefabricated segment lining 1;

[0081] Then, self-compacting concrete is poured from the grouting holes 10 in the bottom arc plate 8 of the prefabricated box culvert to fill the installation adjustment gap between the contact surface of the prefabricated box culvert 3 and the prefabricated segment lining 1.

[0082] Specifically, step D is to tie the steel bars of the locking foot longitudinal connecting beam 4 and construct the locking foot longitudinal connecting beam 4. The specific process is as follows:

[0083] First, according to the on-site construction conditions and organization plan in the tunnel, and after the prefabricated box culvert 3 is assembled in advance and the length is not less than the operating length of the template trolley of the arch wall lining 2;

[0084] Then, tie the steel bars of the locking feet longitudinally connecting the beam 4;

[0085] Then, the annular main reinforcement 7 of the arch wall lining connected to the prefabricated box culvert connector 12 in the prefabricated box culvert 3 is installed;

[0086] Finally, pour the concrete of the locking foot longitudinal connecting beam 4 to complete the construction of the locking foot longitudinal connecting beam 4.

[0087] Specifically, step E is to tie up the steel bars of the arch wall lining 2 and construct the arch wall lining 2. The specific process is as follows:

[0088] First, tie the steel bars of the arch wall lining 2;

[0089] Then, a steel bar connector 6 is reserved on the inner surface of the prefabricated segment lining 1 for positioning and fixing the steel bars;

[0090] Finally, a fully hydraulic automatic walking lining trolley is used to integrally pour the arch wall lining 2 concrete.

[0091] Specifically, the above steps A to E are repeated to complete the construction of the prefabricated segment lining 1, the arch wall lining 2, the prefabricated box culvert 3 and the locking foot longitudinal connecting beam 4.

[0092] Specifically, a steel mesh is arranged in the concrete of the cast-in-place concrete superposition layer 5 , and both ends of the steel bars are anchored into the locking foot longitudinal connecting beam 4 , and are connected to the prefabricated box culvert 3 below through a steel bar connector 12 .

[0093] The utility model forms an annularly closed and longitudinally continuous reinforced concrete internal structure on the inner side of the prefabricated segment lining, which effectively improves the structural longitudinal stiffness, overall stability and waterproof effect of the large-diameter shield tunnel. It can be widely used in large-diameter shield tunnel projects constructed in complex environments such as soft soil and poor geology, high water pressure, underwater riverbed scouring and siltation changes, and high earthquake intensity. It effectively improves the overall stiffness, longitudinal stability and waterproof sealing performance of the large-diameter shield tunnel, and at the same time has the advantages of high degree of mechanization, good integrity, and controllable construction quality.

[0094] The utility model prefabricated box culvert adopts an integral three-hole box structure, and is provided with locking foot longitudinal connecting beams and cast-in-place concrete superposition layers. The internal structure construction has a high degree of mechanization and good integrity.

Claims

1. A large diameter shield tunnel composite structure, comprising a prefabricated segment lining (1), characterized in that: The prefabricated segment lining (1) is provided with a prefabricated box culvert (3) located at the bottom, and the two side top surfaces of the prefabricated box culvert (3) are connected to the locking foot longitudinal connecting beams (4), and the two locking foot longitudinal connecting beams (4) are provided with arch wall linings (2).

2. A large diameter shield tunnel composite structure according to claim 1, characterized in that: A prefabricated box culvert bottom arc plate (8) is formed at the bottom of the prefabricated box culvert (3), and an installation adjustment gap is provided between the prefabricated box culvert bottom arc plate (8) and the prefabricated pipe segment lining (1).

3. The large-diameter shield tunnel composite structure according to claim 1, characterized in that: The cross-sectional profile of the arch wall lining (2) is in the shape of an arc, and the arc is a major arc that is vertically symmetrical.

4. A large diameter shield tunnel composite structure according to claim 3, characterized in that: A post-cast concrete superposition layer (5) is provided between the upper side surface of the prefabricated box culvert (3) and the opposite sides of the two locking foot longitudinal connecting beams (4).

5. The large-diameter shield tunnel composite structure according to claim 3 is characterized in that: The prefabricated box culvert (3) is a three-hole two-span box-type structure, and comprises an upper side surface located at the top, two side top surfaces obliquely intersecting the upper side surface, and a prefabricated box culvert bottom arc plate (8) connecting the two side top surfaces, and the two side top surfaces are bilaterally symmetrical.

6. A large diameter shield tunnel composite structure according to claim 5, characterized in that: A box culvert steel bar connector (12) is provided in the upper side surface, and the box culvert steel bar connector (12) in the upper side surface is used to be connected to the post-cast concrete superposition layer (5).

7. The large-diameter shield tunnel composite structure according to claim 5, characterized in that: A box culvert steel bar connector (12) is provided in the side top surface, and the box culvert steel bar connector (12) in the side top surface is used to be connected to the locking foot longitudinal connecting beam (4).

8. The large-diameter shield tunnel composite structure according to claim 5, characterized in that: An installation adjustment gap is formed between the prefabricated box culvert bottom arc plate (8) and the prefabricated segment lining (1), and the installation adjustment gap is filled by pouring to achieve the fixation of the prefabricated box culvert bottom arc plate (8) and the prefabricated segment lining (1).

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