一种隧道覆盖层开挖水平旋喷桩超前支护结构

Abstract

一种隧道覆盖层开挖水平旋喷桩超前支护结构，其包括一体设置在隧道本体上的数个旋喷桩、数个组合钢筋笼；组合钢筋笼由多个钢筋笼单元串联而成，对应插入各旋喷桩内；单个钢筋笼单元包括连接环、加强筋、安装环、插接组件，连接环和安装环之间设置有数根加强筋，插接组件装配在安装环内部以及连接环外部，插接组件的承插端设置在安装环内、插入端设置在连接环外部，相邻钢筋笼单元通过插接组件连接；组合钢筋笼依次插入喷注的旋喷桩内，形成隧道开挖水平旋喷桩超前支护结构。该支护结构通过插接组合的设计，可将多数量的连接环及安装环进行组合，使得组合后的连接环以及安装环的长度可与不同深度的旋喷桩进行匹配使用。

Claims

1. A tunnel lining excavation level rotary jetting pile advanced support structure, characterized in that: The support structure includes jet grouting piles (2) integrally installed on the tunnel body (1) and combined steel cages. There are several jet grouting piles (2) and combined steel cages. The combined steel cage is composed of multiple steel cage units connected in series and inserted into each jet grouting pile (2). Each steel cage unit includes a connecting ring (3), reinforcing bars (4), mounting rings (5), and plug-in components (6). Several reinforcing bars (4) are vertically fixed between the connecting ring (3) and the mounting ring (5). The two ends of the reinforcing bars (4) are vertically fixed to the connecting ring (3). The opposite ends of the mounting ring (5); the plug-in assembly (6) is assembled inside the mounting ring (5) and outside the connecting ring (3). The plug-in assembly (6) includes a socket end and an insertion end. The socket end is set inside the mounting ring (5) and the insertion end is set outside the connecting ring (3). Adjacent steel cage units are connected through the plug-in assembly (6). The insertion end of the connecting ring (3) is inserted into the socket end inside the mounting ring (5) of the adjacent steel cage unit. The combined steel cages are sequentially inserted into the jet grouting piles (2) to form a horizontal jet grouting pile advance support structure for tunnel excavation.

2. The tunnel lining excavation horizontal rotary jetting pile advanced support structure according to claim 1, characterized in that: The connecting ring (3) and the mounting ring (5) are ring-shaped structures, and their outer circles and central holes are the same size.

3. The tunnel lining excavation horizontal rotary jetting pile advanced support structure according to claim 1, characterized in that: The axis of the mounting ring (5) is coaxial with the axis of the connecting ring (3).

4. The horizontal jet grouting pile pre-support structure for tunnel overburden excavation according to claim 1, characterized in that: The single steel cage unit has four reinforcing bars (4), which are parallel to each other.

5. The tunnel lining excavation horizontal rotary jetted pile forepoling structure according to claim 1, characterized in that: Several reinforcing rings (11) are fixed inside the reinforcing bars (4) of the single steel cage unit.

6. The tunnel lining excavation horizontal rotary jetted pile forepoling structure according to claim 1, characterized in that: The insertion end of the plug-in assembly (6) includes a cavity (601) and a socket (602). The cavity (601) is integrally disposed inside the mounting ring (5), and the socket (602) is integrally disposed on the upper and lower sides of the front end inside the mounting ring (5). The cavity (601) is connected to the socket (602). The cavity (601) is designed with a circular orientation, and the center of the cavity (601) is concentric with the center of the mounting ring (5). The insertion end of the plug-in assembly (6) includes a plug rod (603). The plug rod (603) is fixedly disposed on the upper and lower sides of the rear end inside the connecting ring (3), corresponding to the socket (602) of the mounting ring (5).

7. The tunnel lining excavation horizontal rotary jetted pile forepoling structure according to claim 6, characterized in that: The insertion rod (603) is provided with a limiting hole (704), which is a through hole.

8. The tunnel lining excavation horizontal rotary jetting pile advance support structure according to claim 1, characterized in that: The steel cage unit also includes a locking component (7), which is assembled inside the mounting ring (5). The locking component (7) fixes the position of the combined state of the connecting ring (3) and the mounting ring (5). The locking component (7) includes a mounting block (701), a sliding pin (702), and a spring (703). The mounting block (701) is fixed at the four corners inside the mounting ring (5). The sliding pin (702) is symmetrically slidably arranged inside the mounting block (701). The spring (703) is sleeved on the outside of the sliding pin (702). One end of the spring (703) is fixedly connected to the sliding pin (702), and the other end is fixedly connected to the mounting block (701). The inner side of the sliding pin (702) is designed with a slope.

9. The tunnel lining excavation horizontal rotary jetted pile forepoling structure of claim 1, wherein: The connecting ring (3) and mounting ring (5) of the steel cage unit are provided with rolling components. The rolling components include slots (8) and balls (9). The slots (8) are integrally set inside the connecting ring (3) and mounting ring (5). There are several slots (8). The balls (9) are embedded in the corresponding slots (8). The balls (9) and slots (8) correspond to each other one by one. The balls (9) and slots (8) are connected by a jacking.

10. The horizontal jet grouting pile pre-support structure for tunnel overburden excavation according to claim 1, characterized in that: The tunnel body (1) is integrally provided with a connecting hole (10). There are several connecting holes (10). The connecting holes (10) are located at the positions between each pair of jet grouting piles (2). The interior of the connecting hole (10) is connected to the interior of the jet grouting pile (2).

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