Top node structure and construction method of non-damaging adjustable tunnel intermediate wall

Abstract

The invention discloses a top node structure of a non-damaging adjustable tunnel middle partition wall and a construction method, which includes an arc-shaped member in an arc-shaped strip structure matching the area of the middle partition wall connected to the roof slab; a plurality of threaded fastening structures are fixedly connected between the arc-shaped member and each corresponding segment; a shear-resistant steel bar capable of reciprocating along the length direction is arranged on the side of the arc-shaped member facing the tunnel inner cavity; the upper end of the shear-resistant steel bar is connected with the arc-shaped member in a moving pair, and the remaining part is embedded in the top of the middle partition wall; an anti-slip locking component is arranged on the shear-resistant steel bar for fixing the position of the shear-resistant steel bar relative to the arc-shaped member. During construction, first, the segments are assembled, then the arc-shaped member is arranged at the roof slab position, then the position of the shear-resistant steel bar is adjusted and fixed, and finally, the strip-shaped middle partition wall is installed, the top embedded sleeve of the middle partition wall is placed into the shear-resistant steel bar, and the gap is filled.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel partition wall construction, and particularly to a top node structure of a tunnel partition wall that is damage-free and adjustable and a construction method thereof. Background Art

[0002] With the development of underground structure technology, large-diameter shield tunnels have been applied in multiple subway and urban rail projects.

[0003] In order to meet requirements such as fire fighting and rescue, a partition wall must be provided in the middle of the up and down lines inside the tunnel to divide the circular shield tunnel into two independent compartments from the middle for vehicle operation in two directions, that is, a single-tunnel double-track operation mode is adopted.

[0004] The current situation of related technologies in this field is as follows:

[0005] A circular shield tunnel is assembled by segments. The segment structure is subjected to the action of external water and soil pressure, and the circular structure is more reasonable in force and faster in construction.

[0006] To avoid damaging the segment force system by the partition wall, the wall structure is generally implemented after the segment assembly is completed. At the same time, there is a certain space between the top of the wall and the segment, which is filled with flexible materials.

[0007] To ensure the force stability of the partition wall, a limiting device for the horizontal deformation of the wall is generally required to be provided at the top of the tunnel.

[0008] However, since the shield segments are produced according to standard specifications and the tunnel design center line is fitted by continuously rotating the assembly angle, the installation position of the partition wall limiting device at the top of the tunnel cannot be accurately positioned on the segment before assembly.

[0009] In the prior art, the common connection method for the connection node between the partition wall and the top segment is to drill holes and implant steel bars or install bolts by drilling holes on the segment, which will cause the following defects:

[0010] 1. Drilling holes on the assembled segments will inevitably cause certain damage to the segments.

[0011] 2. When implanting steel bars at the top, the construction quality of the bonding glue is not easy to control due to the action of gravity.

[0012] 3. The construction operation surface inside the tunnel is narrow and the operation environment is poor. The secondary drilling and installation construction is cumbersome and has a long cycle.

[0013] Therefore, how to reduce tunnel damage, improve the durability of shield segments, and then improve the construction environment, construction technology, installation efficiency, and reduce the operation and maintenance costs has become an urgent technical problem for those skilled in the art. Summary of the Invention

[0014] In view of the above-mentioned defects of the prior art, the present invention provides a top node structure and construction method of a damage-free adjustable tunnel middle partition wall, aiming to reduce tunnel damage, improve the durability of shield segments, thereby improving the construction environment, enhancing the construction technology and installation efficiency, and reducing the operation and maintenance costs.

[0015] To achieve the above object, the present invention discloses a top node structure of a damage-free adjustable tunnel middle partition wall, which is arranged in a tunnel with an arc-shaped roof and a middle partition wall inside, and is used for connecting the top of the middle partition wall and the segments at the corresponding position of the tunnel.

[0016] Wherein, the node structure includes an arc-shaped member in the shape of an arc strip structure that matches the area of the middle partition wall connected to the roof;

[0017] One side of the arc-shaped member facing the roof closely adheres to the area of the roof connecting the middle partition wall, and the length is perpendicular to the extension direction of the tunnel;

[0018] The arc-shaped member is fixedly connected to each corresponding segment through a plurality of threaded fastening structures;

[0019] One side of the arc-shaped member facing the inner cavity of the tunnel is provided with a shear-resistant steel bar that can reciprocate along the length direction;

[0020] The upper end of the shear-resistant steel bar is connected to the arc-shaped member in a moving pair, and the remaining part is embedded in the top of the middle partition wall;

[0021] The shear-resistant steel bar is provided with an anti-slip locking component for fixing the position of the shear-resistant steel bar relative to the arc-shaped member.

[0022] Preferably, each of the threaded fastening structures includes an internal threaded pipe embedded in the corresponding segment, and a bolt that passes through the arc-shaped member from the inner side of the tunnel and is threadedly connected to the corresponding internal threaded pipe.

[0023] Preferably, two opposite grooves are provided on both sides of the arc-shaped member corresponding to the moving track of the shear-resistant steel bar;

[0024] The outer side surface of the upper end of the shear-resistant steel bar is provided with a flange-like protruding structure surrounding the side surface corresponding to the two opposite grooves;

[0025] The flange-like protruding structure is stuck in the two opposite grooves and reciprocates.

[0026] Preferably, a pre-embedded sleeve for pre-embedding the shear-resistant steel bar is provided at the top of the middle partition wall.

[0027] Preferably, the gap between the top of the middle partition wall and the segment is filled with a flexible sealing material.

[0028] Preferably, the anti-slip locking member is an external thread provided at one end of the shear steel bar and an anti-slip nut provided on the external thread.

[0029] The present invention also provides a construction method for a node structure at the top of a tunnel middle wall that can be adjusted without damage, which is characterized by including the following steps:

[0030] Step 1: Fix the arc-shaped member through the plurality of threaded fastening structures on the top plate where the segment assembly is completed;

[0031] Step 2: Adjust the position of the shear steel bar between the upper end of the shear steel bar and the arc-shaped member through a moving pair until it meets the requirements;

[0032] Step 3: Fix the position of the shear steel bar relative to the arc-shaped member through the anti-slip locking member;

[0033] Step 4: Lift and install the precast middle wall, place the shear steel bar into the embedded sleeve at the top of the middle wall, and then fix the height of the middle wall;

[0034] Step 5: Fill the gap between the top of the middle wall and the segment.

[0035] Advantages of the present invention:

[0036] The application of the present invention can avoid secondary drilling at the connection between the tunnel vault and the middle wall. By using the embedded internal threaded pipes in the original segments and setting up an adjustable installation device, it can reduce tunnel damage, improve the durability of shield segments, and has greater advantages in terms of construction technology, construction environment, installation efficiency, appearance effect, operation and maintenance, etc. compared with the prior art.

[0037] The following will further illustrate the concept, specific structure and technical effects generated by the present invention with reference to the drawings to fully understand the purpose, features and effects of the present invention. Description of Drawings

[0038] Figure 1 Shows a schematic structural diagram of the connection between the arc-shaped member and a segment in the middle of the top plate in an embodiment of the present invention.

[0039] Figure 2 Shows a schematic structural diagram of the connection between the arc-shaped member and two segments in the middle of the top plate in an embodiment of the present invention.

[0040] Figure 3 Shows a schematic structural diagram of the node structure in an embodiment of the present invention.

[0041] Figure 4 Shows a schematic structural diagram of the segment provided with a plurality of internal threaded pipes in an embodiment of the present invention. Specific implementation mode

[0042] Embodiment

[0043] As Figures 1 to 3 As shown, the top node structure of the non-damaging adjustable tunnel middle partition wall is arranged in a tunnel with an arc-shaped roof and an internal middle partition wall 1, and is used for connecting the top of the middle partition wall 1 and the segment 2 at the corresponding position of the tunnel.

[0044] Among them, the node structure includes an arc-shaped member 3 in the shape of an arc-shaped strip structure that matches the area of the middle partition wall 1 connected to the roof;

[0045] One side of the arc-shaped member 3 facing the roof closely adheres to the area of the roof connecting the middle partition wall 1, and the length is perpendicular to the extension direction of the tunnel;

[0046] The arc-shaped member 3 is fixedly connected to each corresponding segment 2 through a plurality of threaded fastening structures;

[0047] One side of the arc-shaped member 3 facing the inner cavity of the tunnel is provided with a shear-resistant steel bar 6 that can reciprocate along the length direction;

[0048] The upper end of the shear-resistant steel bar 6 is connected to the arc-shaped member 3 in a moving pair, and the remaining part is embedded in the top of the middle partition wall 1;

[0049] The shear-resistant steel bar 6 is provided with an anti-slip locking member 9 for fixing the position of the shear-resistant steel bar 6 relative to the arc-shaped member 3.

[0050] The principle of the present invention is as follows:

[0051] The present invention utilizes the internally threaded pipe 4 pre-embedded in the existing segment 2 for installing the equipment support, and reliably links the arc-shaped member 3 of a certain length with the segment 2 through the bolt 5.

[0052] The arc-shaped member 3 is provided with a shear-resistant steel bar 6 on one side facing the top of the middle partition wall 1 that can be adjusted to move along the length direction of the arc-shaped member 3.

[0053] After the segment 2 is assembled, the arc-shaped member 3 is fixed to the internally threaded pipe 4 in the segment 2 through the bolt 5.

[0054] Then, adjust the position of the shear-resistant steel bar 6 to ensure that it is located in the middle of the tunnel vault and completely coincides with the center of the middle partition wall 1.

[0055] The length of the arc-shaped member 3 needs to be determined by the node force and the adjustment range of the shear-resistant steel bar.

[0056] The middle partition wall 1 adopts a precast reinforced concrete structure, and embedded sleeves 10 matching the shear-resistant steel bars 6 are arranged at the top. The reserved gap between the top and the segment 2 is filled with a flexible sealing material 11 of a certain height. Ensure that the connection node can deform freely vertically and restrain the lateral displacement of the middle partition wall horizontally.

[0057] In some embodiments, each threaded fastening structure includes an internal threaded pipe 4 embedded in the corresponding segment 2, and a bolt 5 that passes through the arc-shaped member 3 from the inside of the tunnel and is threadedly connected to the corresponding internal threaded pipe 4.

[0058] In some embodiments, two opposite grooves 7 are provided on both sides of the arc-shaped member 3 corresponding to the movement track of the shear-resistant steel bar 6;

[0059] On the outer side surface of the upper end of the shear-resistant steel bar 6, a flange-like protruding structure 8 surrounding the side surface is provided corresponding to the two opposite grooves 7;

[0060] The flange-like protruding structure 8 is stuck in the two opposite grooves 7 and reciprocates.

[0061] In some embodiments, an embedded sleeve 10 for embedding the shear-resistant steel bar 6 is provided at the top of the middle partition wall 1.

[0062] In some embodiments, the gap between the top of the middle partition wall 1 and the segment 2 is filled with a flexible sealing material 11.

[0063] In some embodiments, the anti-slip locking member 9 is an external thread provided at one end of the shear-resistant steel bar 6, and an anti-slip nut provided on the external thread.

[0064] The present invention also provides a construction method for a top node structure of a tunnel middle partition wall that is damage-free and adjustable, which is characterized by including the following steps:

[0065] Step 1: Fix the arc-shaped member 3 on the top plate where the segment 2 is assembled through a plurality of threaded fastening structures;

[0066] Step 2: Adjust the position of the shear-resistant steel bar 6 to meet the requirements through the moving pair between the upper end of the shear-resistant steel bar 6 and the arc-shaped member 3;

[0067] Step 3: Fix the position of the shear-resistant steel bar 6 relative to the arc-shaped member 3 through the anti-slip locking member 9;

[0068] Step 4: Lift and install the precast middle partition wall 1, place the shear-resistant steel bar 6 into the embedded sleeve 10 at the top of the middle partition wall 1, and then fix the height of the middle partition wall 1;

[0069] Step 5: Fill the gap between the top of the middle partition wall 1 and the segment 2.

[0070] During the entire installation process, first assemble the segment 2;

[0071] After the segment 2 is assembled, the arc-shaped member 3 is connected and fixed to the internally threaded pipe 4 embedded in the segment through a plurality of threaded fastening structures.

[0072] Among them, the length of the arc-shaped member 3 ensures at least the connection of 4 or more threaded fastening structures, which can meet the requirement that the shear-resistant steel bar 6 can be adjusted within a certain length range.

[0073] Adjust the shear-resistant steel bar 6 to align with the embedded sleeve 10 at the top center line of the shield tunnel and the top of the middle partition wall 1, and fix the shear-resistant steel bar 6 through the anti-slip locking component 9. Finally, the middle partition wall 1 can be installed and the gap between the top of the middle partition wall 1 and the segment 2 is filled with a flexible sealing material 11.

[0074] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field according to the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. The top node structure of the non-destructive adjustable tunnel intermediate wall, characterized in that, It is arranged in a tunnel with an arc-shaped roof and a middle partition wall (1) inside, and is used for connecting between the top of the middle partition wall (1) and the segment (2) at the corresponding position of the tunnel; The node structure includes an arc-shaped member (3) in an arc-shaped strip structure that matches the area of the middle partition wall (1) connected to the roof; One side of the arc-shaped member (3) facing the roof closely adheres to the area of the roof connecting the middle partition wall (1), and the length is perpendicular to the extension direction of the tunnel; The arc-shaped member (3) is fixedly connected to each corresponding segment (2) through a plurality of threaded fastening structures; One side of the arc-shaped member (3) facing the inner cavity of the tunnel is provided with a shear-resistant steel bar (6) that can reciprocate along the length direction; The upper end of the shear-resistant steel bar (6) is connected to the arc-shaped member (3) in a moving pair, and the remaining part is embedded in the top of the middle partition wall (1); The shear-resistant steel bar (6) is provided with an anti-slip locking component (9) for fixing the position of the shear-resistant steel bar (6) relative to the arc-shaped member (3); Each of the threaded fastening structures includes an internal threaded pipe (4) embedded in the corresponding segment (2), and a bolt (5) that passes through the arc-shaped member (3) from the inner side of the tunnel and is threadedly connected to the corresponding internal threaded pipe (4); Two opposite grooves (7) are provided on both sides of the arc-shaped member (3) corresponding to the moving track of the shear-resistant steel bar (6); The outer side surface of the upper end of the shear-resistant steel bar (6) is provided with a flange-like protruding structure (8) surrounding the side surface corresponding to the two opposite grooves (7); The flange-like protruding structure (8) is stuck in the two opposite grooves (7) and reciprocates; 2. The top node structure of the non-damaging adjustable tunnel intermediate wall according to claim 1, characterized in that The top of the middle partition wall (1) is provided with a pre-embedded sleeve (10) for pre-embedding the shear-resistant steel bar (6); 3. The top node structure of the non-damaging adjustable tunnel middle partition wall according to claim 1, characterized in that, The gap between the top of the middle partition wall (1) and the segment (2) is filled with a flexible sealing material (11); 4. The top node structure of the damage-free adjustable tunnel middle partition wall according to claim 1, characterized in that The anti-slip locking component (9) is an external thread provided at one end of the shear-resistant steel bar (6), and an anti-slip nut provided on the external thread; 5. The construction method of the top node structure of the non-damaging adjustable tunnel middle partition wall according to claim 1, characterized in that, It includes the following steps: Step 1: Fix the arc-shaped member (3) through a plurality of the threaded fastening structures on the roof where the segments (2) are assembled; Step 2: Adjust the position of the shear-resistant steel bar (6) through the moving pair between the upper end of the shear-resistant steel bar (6) and the arc-shaped member (3) until it meets the requirements; Step 3: Fix the position of the shear-resistant steel bar (6) relative to the arc-shaped member (3) through the anti-slip locking component (9); Step 4: Hoist the precast middle partition wall (1), place the shear-resistant steel bar (6) into the pre-embedded sleeve (10) at the top of the middle partition wall (1), and then fix the height of the middle partition wall (1); Step 5: Fill the gap between the top of the middle partition wall (1) and the segment (2).

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