Connecting structure for main hole and branch hole of loop

Abstract

A connecting structure of a main hole and an branch hole of a circular road comprises the main hole of the circular road, the branch hole, a connecting notch formed in the wall of the main hole of the circular road, a transition section and an anti-seepage layer, a branch hole expansion face is arranged at the connecting end of the branch hole, the structure of the branch hole expansion face is the same as that of the wall of the branch hole, and the branch hole expansion face corresponds to the connecting notch of the main hole of the circular road. One end of the transition section is inserted into the connecting notch, the end face of the end of the transition section makes contact with the waterproof layer of the connecting notch, the outer wall of the transition section makes contact with the civil air defense reinforced concrete lining layer of the connecting notch, and the other end of the transition section extends towards the branch hole expansion face. And the anti-seepage water layer is arranged on the outer side of the transition section and covers the adit expansion surface and the transition section. The structure is simple, construction is convenient, the phenomenon of water seepage between the main hole and the branch hole of the circular road can be effectively eradicated, and structural safety of the circular road is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction, and in particular to a connection structure between the main tunnel and the branch tunnel of a ring road. Background Technology

[0002] In mountainous cities like Chongqing, to meet transportation needs and address the complex geographical environment, a main ring tunnel is often dug underground in the urban area, with multiple branch tunnels connected to it to meet travel needs in different directions. Typically, the center line of the branch tunnel and the center line of the main ring tunnel (connecting section) form an obtuse angle.

[0003] To meet strength and civil defense requirements, the main tunnel wall is constructed from the inside out with a reinforced concrete inner lining, a waterproof layer, a civil defense reinforced concrete lining layer, and a surrounding rock layer. The auxiliary tunnels, however, do not require civil defense protection; therefore, their walls are constructed from the inside out with a reinforced concrete lining layer, a waterproof membrane layer, and a surrounding rock layer. This structural difference leads to water seepage at the joints of the obtuse-angle connection between the auxiliary tunnels and the main tunnel.

[0004] Therefore, designing a connection structure that can effectively prevent water seepage for the main tunnel and branch tunnels of the ring road is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by providing a connection structure between the main tunnel and the branch tunnel of a ring road. This structure is simple, easy to construct, and can effectively prevent water seepage between the main tunnel and the branch tunnel, thus ensuring the structural safety of the ring road.

[0006] The technical solution of this utility model is: a connection structure between a main tunnel and a branch tunnel, including a main tunnel and a branch tunnel. The main tunnel has a through connection notch on its wall, and also includes a transition section and a waterproof layer. The diameter of the reinforced concrete lining layer of the connection notch is larger than the diameter of the reinforced concrete inner lining layer. The connection end of the branch tunnel has a branch tunnel extension surface, which has the same structure as the branch tunnel wall. The branch tunnel extension surface corresponds to the connection notch of the main tunnel and is arranged parallel to the wall of the main tunnel with a gap. One end of the transition section is inserted into the connection notch, and the end face of this end contacts the waterproof layer of the connection notch, and the outer wall contacts the reinforced concrete lining layer of the connection notch. The other end of the transition section extends toward the branch tunnel extension surface until it contacts the reinforced concrete lining layer of the branch tunnel extension surface. The waterproof layer is set on the outside of the transition section and covers the branch tunnel extension surface and the transition section.

[0007] The inner wall of one end of the transition section is flush with the edge of the reinforced concrete lining of the connecting gap, and the outer wall of the other end of the transition section is flush with the extension edge of the branch tunnel expansion surface.

[0008] A waterstop strip is installed between the outer wall of the transition section and the edge of the reinforced concrete lining layer of the civil defense structure at the connection gap.

[0009] The reinforcing bars of the reinforced concrete lining layer of the civil defense structure with the connection gap protrude outwards, forming an L-shaped structure and located in the transition section.

[0010] One end of the waterproof layer is flush with the waterproof slab layer on the extended surface of the branch tunnel, and the other end extends toward the main tunnel of the ring road until it contacts the reinforced concrete lining layer of the main tunnel of the ring road.

[0011] The above technical solution has the following beneficial effects:

[0012] 1. The connection structure between the main tunnel and the branch tunnel of the ring road includes the main tunnel and the branch tunnel. The main tunnel is used to construct the main road lane, and the branch tunnel is used to construct the branch road lane. A through connection notch is provided in the wall of the main tunnel to connect the branch tunnel to the main tunnel, thus connecting the branch road lane to the main road lane. It also includes a transition section and a waterproof layer. The diameter of the reinforced concrete lining layer of the connection notch is larger than the diameter of the reinforced concrete inner lining layer; that is, the connection notch is a two-stage stepped opening, with the reinforced concrete lining layer having the larger opening and the reinforced concrete inner lining layer having the smaller opening. The connection end of the branch tunnel is provided with a branch tunnel extension surface. The extension surface has the same structure as the branch tunnel wall, ensuring a stable connection joint structure between the branch tunnel and the extension surface and preventing water seepage between them. The branch tunnel extension surface corresponds to the connection notch of the main tunnel and is arranged parallel to the wall of the main tunnel with a gap. One end of the transition section is inserted into the connecting notch. The end face of this section contacts the waterproof layer of the connecting notch, and the outer wall contacts the reinforced concrete lining layer of the connecting notch. In other words, one end of the transition section forms a double-sided seal with the main tunnel opening, and the two sealing surfaces form a 90° angle, effectively ensuring the seal between the transition section and the main tunnel opening and reducing the risk of seepage. Furthermore, the radial restraint of the transition section by the reinforced concrete lining layer of the main tunnel opening ensures its stability and the seal between the transition section and the main tunnel opening. The other end of the transition section extends towards the branch tunnel expansion surface until it contacts the reinforced concrete lining layer of the branch tunnel expansion surface. Similarly, the other end of the transition section forms a surface-to-surface seal with the branch tunnel expansion surface, ensuring the seal between the transition section and the branch tunnel and reducing the risk of seepage. The waterproof layer is located on the outside of the transition section and covers both the branch tunnel expansion surface and the transition section, further improving the seal between the transition section and the branch tunnel and eliminating the risk of seepage.

[0013] 2. Waterstop strips are installed between the outer wall of the transition section and the edge of the reinforced concrete lining layer of the civil defense structure at the connection gap, which further improves the sealing between the transition section and the main tunnel of the ring road and eliminates the risk of water seepage.

[0014] 3. The reinforcing bars of the reinforced concrete lining layer of the civil defense structure at the connection gap protrude outwards, forming an L-shaped structure and located in the transition section, ensuring the stability of the connection between the transition section and the main tunnel of the ring road, thereby ensuring the sealing between the transition section and the main tunnel of the ring road.

[0015] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 for Figure 1 Enlarged view of point M in the middle.

[0018] In the attached diagram, 1 is the main tunnel of the ring road, 2 is the branch tunnel, 3 is the connecting gap, 4 is the transition section, 5 is the waterproof layer, 6 is the civil defense reinforced concrete lining layer, 7 is the reinforced concrete inner lining layer, 8 is the branch tunnel extension surface, 9 is the waterproof layer, 10 is the reinforced concrete lining layer, 11 is the waterstop strip, and 12 is the waterproof board layer. Detailed Implementation

[0019] See Figure 1 and Figure 2This is a specific embodiment of a connection structure between a main tunnel and a branch tunnel in a ring road. The connection structure includes a main tunnel 1 and a branch tunnel 2. Both the main tunnel and the branch tunnel have conventional structures. The main tunnel wall, from the inside out, is provided with a reinforced concrete inner lining, a waterproof layer, a reinforced concrete lining for civil defense, and a surrounding rock layer. The branch tunnel wall, from the inside out, is provided with a reinforced concrete lining, a waterproof slab layer, and a surrounding rock layer. A through connection notch 3 is provided in the wall of the main tunnel 1. Obviously, the diameter of the connection notch is larger than the diameter of the branch tunnel. It also includes a transition section 4 and a waterproof layer 5. Typically, the transition section is also a reinforced concrete structure, and the waterproof layer uses the same material as the waterproof slab layer used in the branch tunnel and the waterproof layer used in the main tunnel. The diameter of the reinforced concrete lining 6 for civil defense, the connection notch 3, is larger than the diameter of the reinforced concrete inner lining 7; that is, the connection notch is a stepped notch with a larger outer notch and a smaller inner notch. The connecting end of the branch tunnel 2 is provided with a branch tunnel expansion surface 8. The branch tunnel expansion surface 8 has the same structure as the branch tunnel wall, which makes the connection structure between the branch tunnel and the branch tunnel expansion surface stable. Moreover, the angle between the branch tunnel and the branch tunnel expansion surface is determined according to the terrain planning. The branch tunnel expansion surface 8 corresponds to the connection gap 3 of the main tunnel of the ring road and is arranged parallel to the wall of the main tunnel 1 of the ring road with a gap. One end of the transition section 4 is inserted into the connection gap 3. The end face of this end contacts the waterproof layer 9 of the connection gap, and the outer wall contacts the civil defense reinforced concrete lining layer 6 of the connection gap. Specifically, the inner wall of one end of the transition section 4 is flush with the edge of the reinforced concrete inner lining layer 7 of the connection gap, and a waterstop strip 11 is provided between the outer wall of the transition section 4 and the edge of the civil defense reinforced concrete lining layer 6 of the connection gap. In order to ensure structural stability, the steel bars of the civil defense reinforced concrete lining layer 6 of the connection gap protrude outward, forming an L-shaped structure and located in the transition section 4. The other end of the transition section 4 extends toward the branch tunnel expansion surface 8 until it contacts the reinforced concrete lining layer 10 of the branch tunnel expansion surface. Specifically, the outer wall of the other end of the transition section 4 is flush with the extension edge of the branch tunnel expansion surface 8. The waterproof layer 5 is set on the outside of the transition section 4 and covers the branch tunnel expansion surface 8 and the transition section 4. Specifically, one end of the waterproof layer 5 is flush with the waterproof slab layer 12 of the branch tunnel expansion surface, and the other end extends toward the main tunnel of the ring road until it contacts the reinforced concrete lining layer 6 of the main tunnel of the ring road.

Claims

1. A connection structure for a main tunnel and a branch tunnel of a ring road, comprising a main tunnel (1) and a branch tunnel (2), wherein a through connection notch (3) is provided on the wall of the main tunnel (1), characterized in that: It also includes a transition section (4), a waterproof layer (5), and the diameter of the reinforced concrete lining layer (6) of the connecting gap (3) is larger than the diameter of the reinforced concrete inner lining layer (7). The connecting end of the branch tunnel (2) is provided with a branch tunnel expansion surface (8). The branch tunnel expansion surface (8) has the same structure as the branch tunnel wall. The branch tunnel expansion surface (8) corresponds to the connecting gap (3) of the main tunnel of the ring road and is arranged parallel to the wall of the main tunnel of the ring road (1) with a gap. One end of the transition section (4) is inserted into the connecting notch (3), and the end face of this end contacts the waterproof layer (9) of the connecting notch, and the outer wall contacts the reinforced concrete lining layer (6) of the connecting notch. The other end of the transition section (4) extends toward the expansion surface (8) of the branch tunnel until it contacts the reinforced concrete lining layer (10) of the expansion surface of the branch tunnel. The impermeable layer (5) is set on the outside of the transition section (4) and covers the extension surface (8) of the branch tunnel and the transition section (4).

2. The connection structure between the main tunnel and the branch tunnel of the ring road according to claim 1, characterized in that: The inner wall of one end of the transition section (4) is flush with the edge of the reinforced concrete lining (7) of the connecting gap, and the outer wall of the other end of the transition section (4) is flush with the extension edge of the branch tunnel expansion surface (8).

3. The connection structure between the main tunnel and the branch tunnel of the ring road according to claim 1, characterized in that: A waterstop strip (11) is provided between the outer wall of the transition section (4) and the edge of the reinforced concrete lining layer (6) of the connecting gap.

4. The connection structure between the main tunnel and the branch tunnel of the ring road according to claim 1, characterized in that: The steel bars of the reinforced concrete lining layer (6) of the civil defense structure with the connection gap protrude outward, forming an L-shaped structure and located in the transition section (4).

5. The connection structure between the main tunnel and the branch tunnel of the ring road according to claim 1, characterized in that: One end of the waterproof layer (5) is flush with the waterproof slab layer (12) of the branch tunnel expansion surface, and the other end extends toward the main tunnel of the ring road until it contacts the civil defense reinforced concrete lining layer (6) of the main tunnel of the ring road.

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