CN106437758A - Upper and lower integral whole shield tunnel segment lining structure - Google Patents

Abstract

An upper and lower integrated shield tunnel segment lining structure, including an upper tunnel and a lower tunnel, characterized in that: the upper tunnel and the lower tunnel form an "8"-shaped integrated shield tunnel segment lining structure, which The specific composition is: the arc-shaped upper segment is assembled in the circumferential direction to form a superior arc-shaped upper tunnel segment ring, and the circular-arc-shaped lower segment is assembled in the circumferential direction to form a superior arc-shaped lower tunnel segment ring; the upper tunnel segment ring and lower tunnel segment ring through Shaped special-shaped connecting segments are assembled to form an "8"-shaped structural ring; multiple structural rings are assembled longitudinally to form an "8"-shaped integrated shield tunnel segment lining; the structure above the special-shaped connecting segment is the upper part Tunnel, the structure below is the lower tunnel. This kind of upper and lower integrated shield tunnel segment lining has strong integrity, high strength and good bearing capacity, can effectively control ground settlement, ensure the safety of surrounding buildings and structures, reduce construction difficulty and improve construction efficiency.

Description

Upper and lower integrated shield tunnel segment lining structure

technical field

The invention relates to a shield tunnel segment lining structure.

Background technique

With the continuous improvement of the degree of mechanization and manufacturing level, the shield construction technology has gradually become the main method for the construction of underground projects such as urban underground railways because of its advantages such as less disturbance to the ground, less impact on the environment, and faster construction speed. The subway shield tunnels are mostly double-line tunnels, usually with parallel left and right lines. However, under special geological conditions, in order to avoid certain underground buildings and structures, the subway double-track tunnel will adopt an overlapping shield tunnel with upper and lower separation. The upper and lower overlapping shield tunnels are excavated by the shield machine, and the segments are assembled first and then to form two separated lower and upper tunnel structures. For example, Shenzhen Metro Line 2 and Line 3, Guangzhou Rail Transit Line 5, etc. have adopted this kind of upper and lower separated overlapping shield tunnels in part or all of the subway sections due to various conditions.

The upper and lower separated overlapping shield tunnels usually have the characteristics of small overlapping clear distance and long overlapping distance. The construction sequence is: first excavation of the lower line tunnel → grouting reinforcement of the interlayer soil → support protection of the lower line tunnel → shield excavation of the upper line tunnel → Grouting reinforcement of the upper-line tunnel. There are many engineering difficulties and disadvantages in the construction process of separate overlapping shield tunnels: (1) additional stress will be generated on the lower tunnel during the excavation process of the upper tunnel, which will cause the deformation of the lower tunnel; (2) after the construction of the upper tunnel The unloading effect may cause the uplift of the downline tunnel; (3) the support speed of the downline tunnel support must match the assembly speed of the upline tunnel, otherwise the tunnel will be deformed; (4) the vertical height of the construction process is large, and the ground and superstructure The impact of landforms is relatively large, and the control of land subsidence is difficult.

Contents of the invention

The object of the present invention is to provide an upper and lower integrated shield tunnel segment lining structure, the upper and lower integrated shield tunnel segment lining structure has strong integrity, high strength, good bearing capacity, and can effectively control ground subsidence, Ensure the safety of surrounding buildings and structures, reduce construction difficulty and improve construction efficiency.

The technical solution adopted by the present invention to realize the purpose of the invention is an upper and lower integrated shield tunnel segment lining structure, which includes an upper tunnel and a lower tunnel, and is characterized in that: the upper tunnel and the lower tunnel form a "8" character type integrated shield tunnel segment lining structure, its specific composition is:

A plurality of arc-shaped upper segments are hoop-assembled to form an arc-shaped upper tunnel segment ring, and a plurality of arc-shaped lower segments are hoop-assembled to form an arc-shaped lower tunnel segment ring; the upper tunnel segment ring and lower tunnel segment ring through Shaped special-shaped connecting segments are assembled to form an "8"-shaped structural ring; multiple structural rings are assembled longitudinally to form an "8"-shaped integrated shield tunnel segment lining; the structure above the special-shaped connecting segment is the upper part Tunnel, the structure below is the lower tunnel.

Compared with prior art, the beneficial effect of the present invention is:

1. The integrated shield tunnel segment lining structure of the present invention removes the interlayer soil between the upper and lower overlapping shield tunnel structures of the separated type. It has stronger integrity, more stable and firm structure, and can more effectively control the ground Settlement, to ensure the safety of surrounding buildings and structures.

2. After one-time excavation by a large-scale shield machine, the upper and lower integrated shield tunnel structure of the present invention can be obtained by one-time assembly and formation. Compared with two-time excavation and two-time assembly, the disturbance of the construction to the ground is reduced , construction has less impact on the strata, and can better control land subsidence.

3. One-time excavation and one-time assembly, compared with two-time excavation and two-time assembly, also significantly improves the construction efficiency. Moreover, the upper and lower integrated shield tunnel structure of the present invention does not require construction procedures such as setting up and dismantling the supports of the off-line tunnel, which further improves the construction efficiency.

Further, the left side and the right side of the special-shaped connecting segment of the present invention are equal in length but the ends are not on the same horizontal line; the special-shaped connecting segment with a high left end is a left-high special-shaped connecting segment, and the left-high special-shaped connecting segment is rotated 180 degrees left and right. ° Serve as the right high special-shaped connecting segment; when assembling multiple structural rings, the left high special-shaped connecting segment and the right high special-shaped connecting segment are used alternately.

In this way, the staggered assembly of the segment seams between the structural rings improves the longitudinal stiffness of the tunnel structure and can more effectively control the uneven settlement of the tunnel; at the same time, the staggered assembly of the segment seams also reduces the deformation of the lining structure. Reduced, the seams are tighter, which can improve the waterproof performance of the entire segment lining structure.

Further, the thickness of the lower segment of the present invention is 1.5-2 times the thickness of the upper segment. The upper segment hoop-assembled connectors are 3 bent bolts, and the lower segment hoop-assembled connectors are 5 bent bolts.

In this way, the strength of the lower tunnel with high load-bearing requirements is strengthened, which can well ensure the load-bearing capacity and safety of the entire tunnel structure, while reducing the strength and materials of the upper tunnel with lower load-bearing requirements, which meets the economic requirements of tunnel construction.

Further, there are five upper segments and five lower segments in the present invention, and the arc of each upper segment or lower segment is 44°.

In this way, the size of the segments is suitable, which not only facilitates the prefabrication and transportation of the segments, but also reduces the assembling workload of the segments and improves the construction efficiency.

Further, the connecting piece for longitudinally assembling the plurality of structural rings of the present invention is a bolt.

In this way, the longitudinal assembly connection between the structural rings can be realized more conveniently and quickly.

Further, the upper tunnel segment ring and the lower tunnel segment ring of the present invention pass The specific structure of the "8"-shaped structural ring formed by assembling special-shaped connecting segments is as follows: the upper left end and upper right end of the special-shaped connecting segment are connected to the upper tunnel segment ring through three bent bolts; the special-shaped connecting segment Both the lower left end and the lower right end are connected to the lower tunnel segment ring by 5 bent bolts.

In this way, the bearing capacity of the lower tunnel can be guaranteed, and at the same time, the construction and material consumption of the upper tunnel can be reduced, taking into account the safety and economy of the tunnel structure.

Further, two transverse grouting holes are left on the left and right sides of the special-shaped connecting segment of the present invention.

In this way, after the tunnel lining is assembled, the soil around the connecting parts of the upper and lower tunnels can be grouted and reinforced through the grouting holes, so as to further improve the overall strength and bearing capacity of the tunnel structure.

Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail

Description of drawings

Fig. 1 is a side view structural schematic diagram of an embodiment of the present invention.

Fig. 2 is a left side view of Fig. 1 .

Fig. 3 is a sectional view along line A-A of Fig. 1 .

detailed description

Example

Figures 1-3 show that a specific embodiment of the present invention is an upper and lower integrated shield tunnel segment lining structure, including an upper tunnel and a lower tunnel, characterized in that: the upper tunnel and the lower tunnel constitute The specific composition of the "8"-shaped integrated shield tunnel segment lining structure is:

A plurality of arc-shaped upper segments 1 are hoop-assembled to form an arc-shaped upper tunnel segment ring, and a plurality of arc-shaped lower segments 2 are hoop-assembled to form an arc-shaped lower tunnel segment ring; the upper tunnel Segment ring and lower tunnel segment ring through Shaped special-shaped connecting segments are assembled to form an "8"-shaped structural ring 4; multiple structural rings 4 are assembled longitudinally to form an "8"-shaped integrated shield tunnel segment lining structure; the structure above the special-shaped connecting segment It is the upper tunnel, and the structure below is the lower tunnel.

The left side and the right side of the special-shaped connecting segment of this example are equal in length but the ends are not on the same horizontal line; ° Serve as the right high special-shaped connecting segment 3b. When a plurality of structural rings 4 are assembled, the left high special-shaped connecting segment 3a and the right high special-shaped connecting segment 3b are used alternately. That is, if the previous structural ring 4 adopts the left high special-shaped connecting segment 3a, then the latter structural ring 4 adopts the right high special-shaped connecting segment 3b.

In this example, the thickness of the lower segment 2 is 1.5-2 times the thickness of the upper segment 1; the upper segment 1 is assembled in the circumferential direction by 3 bent bolts, and the lower segment 2 is assembled in the circumferential direction by 5 bent bolts. bolt.

There are five upper segments 1 and lower segments 2 in this example, and the arc of each upper segment 1 or lower segment 2 is 44°.

The connectors assembled longitudinally by the plurality of structural rings 4 in this example are bolts.

In this example, the upper tunnel segment ring and the lower tunnel segment ring pass The specific structure of the "8"-shaped structural ring 4 is formed by assembling the special-shaped connecting segments: the upper left end and the upper right end of the special-shaped connecting segment are connected to the upper tunnel segment ring through three bent bolts; the special-shaped connecting segment Both the lower left end and the lower right end of the tunnel are connected with the lower tunnel segment ring by 5 bent bolts.

Two transverse grouting holes 3a are left on the left and right sides of the special-shaped connecting segment of this example.

Claims (7)

1. a kind of upper and lower integral type shield tunnel segment lining structure, including top tunnel and bottom tunnel, it is characterised in that：Institute The top tunnel that states and bottom tunnel constitute the integral type shield tunnel segment lining of " 8 " font, and its specific composition is：

The assembled top tunneltron loop for forming major arc shape of top section of jurisdiction (1) ring of multiple circular arcs, under multiple circular arcs The assembled bottom tunneltron loop for forming major arc shape of portion section of jurisdiction (2) ring；Top tunneltron loop and bottom tunneltron loop lead to CrossThe abnormity connection pipe sheet assembling of shape forms the structure ring (4) of " 8 " font；Multiple structure ring (4) assembled formation in longitudinal direction again The integral type shield tunnel segment lining structure of " 8 " font；Structure more than abnormity connection section of jurisdiction is top tunnel, below Structure is bottom tunnel.

2. upper and lower integral type shield tunnel segment lining structure according to claim 1, it is characterised in that：Described abnormity The left side of connection section of jurisdiction, the isometric but end in the right are not in the same horizontal line；The high abnormity connection section of jurisdiction of left-hand end is left height Abnormity connection section of jurisdiction (3a), by left high 180 ° of section of jurisdiction (3a) left rotation and right rotation of abnormity connection right high abnormity connection section of jurisdiction (3b)； During multiple structure ring (4) assembly, left high abnormity connection section of jurisdiction (3a) and right high abnormity connection section of jurisdiction (3b) are used alternatingly.

3. upper and lower integral type shield tunnel segment lining structure according to claim 1, it is characterised in that：Described bottom Section of jurisdiction (2) thickness is 1.5-2 times of top section of jurisdiction (1) thickness；The connector of top section of jurisdiction (1) ring assembly is 3 curved bolts, The connector of bottom section of jurisdiction (2) ring assembly is 5 curved bolts.

4. upper and lower integral type shield tunnel segment lining structure according to claim 1, it is characterised in that：Described top Section of jurisdiction (1) and bottom section of jurisdiction (2) are 5, and the radian of each top section of jurisdiction (1) or bottom section of jurisdiction (2) is 44 °.

5. upper and lower integral type shield tunnel segment lining structure according to claim 1, it is characterised in that：Described is multiple The assembled connector in structure ring (4) longitudinal direction is latch.

6. upper and lower integral type shield tunnel segment lining structure according to claim 1, it is characterised in that：Described top Tunneltron loop and bottom tunneltron loop pass throughThe abnormity connection pipe sheet assembling of shape forms the structure ring (4) of " 8 " font Concrete structure be：The left upper end of abnormity connection section of jurisdiction and upper right side are all connected with top tunneltron loop by 3 curved bolts； The lower-left end of abnormity connection section of jurisdiction and bottom righthand side are all connected with bottom tunneltron loop by 5 curved bolts.

7. upper and lower integral type shield tunnel segment lining structure according to claim 1, it is characterised in that：Described abnormity Two horizontal injected holes are all left on the left side of connection section of jurisdiction, the right.