Anti-floating shield tunnel penetrating through river channel downwards

Abstract

The utility model discloses an anti-floating shield tunnel underneath passing through a river channel, which is characterized in that a supporting rod is arranged on a bottom segment of the shield tunnel towards the interior of a surrounding rock-soil body, the upper end of the supporting rod is fixedly connected to the bottom segment of the shield tunnel, the lower end of the supporting rod is fixedly connected to the interior of the surrounding rock-soil body, and the shield tunnel is fixedly connected with the surrounding rock-soil body through the supporting rod. The shield tunnel and the surrounding rock soil body are fixedly connected through the supporting rods, so that the anti-floating requirement of the shield tunnel penetrating through the river channel downwards is guaranteed, and the structural safety of the shield tunnel penetrating through the river channel downwards is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of underground construction, and more specifically to an anti - floating shield tunnel crossing a river channel. Background Art

[0002] In subway construction, it is very common for shield tunnels in the shield section to cross rivers. The shield tunnel crossing the river channel is subject to a large buoyancy force due to the high groundwater level. Since the tunnel is located in the riverbed foundation soil and the overlying soil is completely below the river water level, it can only play a role of counterweight with its underwater weight. Therefore, when the tunnel crosses under the river channel, the vertical pressure of the overlying soil may not be sufficient to provide a reaction force, resulting in the tunnel floating. In severe cases, it will cause the connection of the shield segments to crack, endangering the structural safety.

[0003] In response to the above problems, the currently commonly used method for floating control is to use the weight of the structure itself and the weight of the soil above the tunnel to resist the buoyancy force. However, it is difficult to meet the anti - floating requirements for shield tunnels crossing river channels only with their own weight and the weight of the overlying soil. Summary of the Utility Model

[0004] The utility model aims to avoid the deficiencies of the above - mentioned prior art and provides an anti - floating shield tunnel crossing a river channel, so as to ensure the anti - floating requirements for the shield tunnel crossing the river channel, thereby ensuring the structural safety of the shield tunnel crossing the river channel.

[0005] The utility model adopts the following technical solutions to solve the technical problems:

[0006] The anti - floating shield tunnel crossing a river channel of the utility model is characterized in that: support rods are arranged in the surrounding rock soil towards the bottom segments of the shield tunnel. The upper ends of the support rods are fixedly connected to the bottom segments of the shield tunnel, and the lower ends of the support rods are fixedly connected to the surrounding rock soil, and the shield tunnel is fixedly connected to the surrounding rock soil by the support rods.

[0007] The anti - floating shield tunnel crossing a river channel of the utility model is also characterized in that: three of the support rods form a "personal" - shaped support rod group in the cross - section of the shield tunnel, and multiple groups of the "personal" - shaped support rod groups are distributed at intervals along the axial direction of the shield tunnel.

[0008] The anti - floating shield tunnel crossing a river channel of the utility model is also characterized in that: the support rods are anchor rods, and the upper ends of the anchor rods are fixedly arranged on the bottom segments of the shield tunnel by steel washers and nuts.

[0009] The anti - floating shield tunnel crossing a river channel of the utility model is also characterized in that: a grouting pipe is built in the support rod, and the grouting port of the grouting pipe is reserved on the inner wall of the shield tunnel, and grouting is carried out into the surrounding rock soil through the grouting pipe to form consolidation.

[0010] The utility model is also characterized in that the anti-floating shield tunnel under the river is characterized in that the support rod is composed of a primary rod and a secondary rod to form an "umbrella" structure, the secondary rod is a plurality of rods in the shape of umbrella ribs at the front end of the primary rod, and a consolidation surface is formed in the surrounding rock soil by the plurality of secondary rods.

[0011] The utility model is also characterized in that: a transfer box is arranged at the front end of the primary rod, the secondary rod is arranged as a telescopic rod, the retracted secondary rod is accommodated in the transfer box, and the extended secondary rod is extended into the surrounding rock and soil in the form of an umbrella rib.

[0012] The utility model is also characterized in that the secondary rods arranged as telescopic rods are composed of inner tubes and outer tube sliding sleeves, and the inner tube is slidably extended by grouting pressure to form an extension section of the outer tube.

[0013] The utility model is also characterized in that a cylindrical liquid bag is arranged on the inner wall surface of the shield tunnel, and a solidified cylinder is formed by grouting and filling the liquid bag, and the cylinder is used to limit the floating pipe segments in the shield tunnel.

[0014] Compared with the prior art, the beneficial effects of the utility model are embodied in:

[0015] 1. The utility model uses support rods to fix the shield tunnel with the surrounding rock and soil, so that the anti-floating requirements of the shield tunnel under the river are guaranteed, and the structural safety of the shield tunnel under the river is effectively guaranteed;

[0016] 2. The utility model sets the support rod as an anchor rod, which has a simple structure and is easy to implement;

[0017] 3. The utility model sets the support rod as a grouting rod to consolidate the surrounding rock and soil, and the structure is simple and easy to implement;

[0018] 4. The utility model sets the grouting rod as an "umbrella" structure, and uses the umbrella ribs to form a consolidation surface in the surrounding rock and soil, so the structure is firm and reliable;

[0019] 5. The utility model utilizes the liquid bag grouting to fill and solidify to form a solidified cylinder, and implements position limiting on the floating segments in the shield tunnel, effectively avoiding the dislocation of the segments and ensuring the safety of the tunnel section under the river. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic cross-section diagram of the anti-floating shield tunnel of the utility model;

[0021] Figure 2 It is a schematic diagram of the grouting rod structure in the utility model.

[0022] Numbers in the figure: 1 shield tunnel, 2 bonding layer, 3 liquid bag, 4 support rod, 5 nut, 6 steel gasket, 7 primary rod, 8 secondary rod, 9 grouting pipe, 10 adapter box, 11 surrounding rock and soil. DETAILED DESCRIPTION

[0023] See also Figure 1 In this embodiment, the structure of the anti-floating shield tunnel under the river channel is as follows: a support rod 4 is arranged in the bottom segment 2 of the shield tunnel 1 toward the surrounding rock soil 11, the upper end of the support rod 4 is fixedly connected to the bottom segment 2 of the shield tunnel 1, and the lower end of the support rod 4 is fixedly connected to the surrounding rock soil 11, and the support rod 4 is used to fix the shield tunnel 1 and the surrounding rock soil 11.

[0024] Figure 1 It is shown that, in a specific embodiment, corresponding technical measures also include:

[0025] The support rods 4 are grouped into three on the cross section of the shield tunnel 1 to form a "individual" shaped support rod group, and multiple "individual" shaped support rod groups are spaced apart along the axial direction of the shield tunnel; a cylindrical liquid bag 3 is arranged on the inner wall surface of the shield tunnel 1, and the liquid bag 3 is fixed on the inner wall of the tunnel by means of an adhesive layer 2, and a solidified cylinder is formed by grouting and filling the liquid bag 3, and the solidified cylinder is used to limit the floating segments in the shield tunnel 1, so as to effectively prevent the segments from being displaced due to floating.

[0026] The support rod 4 can be set as an anchor rod, and the upper end of the anchor rod is fixed on the bottom segment 2 of the shield tunnel 1 by using a steel washer 6 and a nut 5; Figure 1 and Figure 2 The support rod 4 shown has a built-in grouting pipe 9, and the grouting port of the grouting pipe 9 is reserved on the inner wall of the shield tunnel 1, and grouting is injected into the surrounding rock and soil 11 through the grouting pipe 9 to form consolidation.

[0027] like Figure 2 As shown, in this embodiment, the support rod is composed of a primary rod 7 and a secondary rod 8 forming an "umbrella" structure, the secondary rod 8 is a plurality of rods in the shape of umbrella ribs at the front end of the primary rod 7, and a consolidation surface is formed in the surrounding rock mass 11 by the plurality of secondary rods 8; an adapter box 10 is arranged at the front end of the primary rod 7, and the secondary rod 8 is arranged as a telescopic rod, the retracted secondary rod 8 is accommodated in the adapter box 10, and the extended secondary rod 8 is extended into the surrounding rock mass 11 in the shape of umbrella ribs; the secondary rod 8 arranged as a telescopic rod is composed of an inner tube and an outer tube sliding sleeve, and the grouting pressure is used to slide the inner tube to form an extension section of the outer tube; a grouting pipe 9 runs through the primary rod 7 and the secondary rod 8, one end of the grouting pipe 9 is a grouting port reserved on the inner wall of the shield tunnel 1, and the other end is communicated with the secondary rod 8.

[0028] During the specific construction, the liquid capsule 3 is fixed on the inner wall of the tunnel through the adhesive layer 2.

[0029] This specification is only a preferred embodiment of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements can be designed without departing from the principle of the utility model, and these improvements should also be regarded as the protection scope of the utility model.

Claims

1. An anti-floating shield tunnel under a river, characterized by: A support rod (4) is arranged in the bottom segment of the shield tunnel (1) toward the surrounding rock mass (11); the upper end of the support rod (4) is fixedly connected to the bottom segment of the shield tunnel (1); the lower end of the support rod (4) is fixedly connected to the surrounding rock mass (11); the shield tunnel (1) and the surrounding rock mass (11) are fixedly connected by the support rod (4); the support rod (4) is an anchor rod, the upper end of which is fixedly arranged at the bottom segment of the shield tunnel (1) by means of a steel washer (6) and a nut (5). The support rod (4) is provided with a grouting pipe (9), the grouting opening of the grouting pipe (9) being reserved on the inner wall of the shield tunnel (1), and grouting is injected into the surrounding rock mass (11) through the grouting pipe (9) to form consolidation; the support rod is composed of a primary rod (7) and a secondary rod (8) to form an "umbrella" structure, the secondary rod (8) being a plurality of rods in the shape of umbrella ribs at the front end of the primary rod (7), and the plurality of secondary rods (8) form a consolidation surface in the surrounding rock mass (11).

2. The anti-floating shield tunnel under a river according to claim 1 is characterized in that: The support rods (4) are grouped in groups of three on the cross section of the shield tunnel (1) to form a ""-shaped support rod group, and a plurality of ""-shaped support rod groups are distributed at intervals in the axial direction of the shield tunnel.

3. The anti-floating shield tunnel under the river according to claim 1 is characterized in that: An adapter box (10) is arranged at the front end of the primary rod (7), and the secondary rod (8) is arranged as a telescopic rod. The retracted secondary rod (8) is accommodated in the adapter box (10), and the extended secondary rod (8) extends into the surrounding rock mass (11) in the shape of an umbrella rib.

4. The anti-floating shield tunnel under a river according to claim 3 is characterized by: The secondary rod (8) configured as a telescopic rod is composed of an inner tube and an outer tube sliding sleeve, and the grouting pressure is used to make the inner tube slide and extend to form an extension section of the outer tube.

5. The anti-floating shield tunnel under the river according to claim 1 is characterized in that: A cylindrical liquid bag (3) is arranged on the inner wall surface of the shield tunnel (1), and a solidified cylinder is formed by grouting, filling and solidifying the liquid bag (3), and the floating pipe segment in the shield tunnel (1) is limited by the cylinder.

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