A deformation-preventing reinforcing device for an overlying tunnel segment

Abstract

The present application relates to the technical field of tunnel reinforcement, and particularly discloses a kind of anti-deformation reinforcing device for overlying tunnel segment, which comprises an axial vertical lower tunnel and an upper tunnel, two groups of process grooves are formed in the lower tunnel, and the two groups of process grooves are respectively located on the two sides below the upper tunnel, each group of process grooves is two, and the two process grooves are symmetrically located on the two sides of the lower tunnel, the process grooves are supported by supporting plates, arc-shaped holes are drilled from one process groove to another in the same group of process grooves, the arc-shaped holes pass above the lower tunnel, arc-shaped supporting rods are arranged in the arc-shaped holes, and anchor piles are arranged at the two ends of the arc-shaped supporting rods.The beneficial effects of the present application are as follows: the arc-shaped supporting rods and anchor piles form an arc-shaped lifting layer, and the settlement force generated by the upper tunnel and the reinforced soil is partially transmitted to the ground or deep stable stratum, which effectively blocks the concentrated pressure on the vault of the lower tunnel and prevents the deformation of the lower tunnel segment caused by vertical overload.

Description

Technical Field

[0001] This invention relates to the field of tunnel reinforcement technology, and in particular to a device for preventing deformation and reinforcing stacked tunnel segments. Background Technology

[0002] With the increasing density of urban underground transportation networks, the number of tunnel lines with overlapping upper and lower levels is growing due to constraints imposed by existing underground structures and spatial conditions. In these overlapping tunnels, a layer of soil with a relatively limited thickness lies between the upper and lower tunnels. To reduce the disturbance caused by the upper tunnel during construction and operation, existing technologies commonly employ ground reinforcement methods for this interlayer soil, such as grouting reinforcement, high-pressure jet grouting pile reinforcement, or freezing reinforcement, to create an improved load-bearing stratum and reduce the downward transmission of loads.

[0003] However, in actual long-term operation, it has been found that this method of reinforcing only the interlayer soil still has significant technical defects. Due to factors such as ground overload, regional settlement, long-term consolidation creep of the strata, and repeated fluctuations in groundwater levels, the overall strata where the stacked tunnel is located are prone to uneven settlement. In this case, the upper tunnel and the reinforced interlayer soil below it often exhibit a tendency to shift downwards as a whole. Because the reinforced soil has high overall stiffness and integrity, this overall settlement will directly generate concentrated downward pressure on the arch of the lower tunnel. This downward pressure, acting on the segment structure of the lower tunnel, can easily cause segment deformation, seriously threatening the structural durability of the lower tunnel. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a deformation-resistant reinforcement device for stacked tunnel segments.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A deformation-resistant reinforcement device for stacked tunnel segments includes a lower tunnel and an upper tunnel stacked together. Two sets of process slots are opened in the lower tunnel, and the two sets of process slots are located on both sides below the upper tunnel. Each set of process slots consists of two slots, which are symmetrically located on both sides of the lower tunnel. The process slots are supported by support plates. In the same set of process slots, an arc-shaped hole is drilled from one process slot to the other process slot. The arc-shaped hole passes over the lower tunnel. An arc-shaped support rod is installed in the arc-shaped hole. Anchor piles are installed at both ends of the arc-shaped support rod, and the anchor piles extend upward to the ground.

[0006] Preferably, multiple sets of installation holes are drilled upwards from the lower tunnel, with two installation holes in each set. The two installation holes in the same set are arranged in an intersecting manner, and a reinforcing pipe is installed in each installation hole. The two corresponding reinforcing pipes are arranged in an intersecting manner, and the intersection point is located directly below the upper tunnel. Corresponding clamps and slots are provided on the reinforcing pipes, and the two corresponding reinforcing pipes are connected together through the clamps and slots.

[0007] Preferably, the arc-shaped support rod is provided with multiple clearance holes, and the reinforcing pipe passes through the clearance holes one by one.

[0008] Preferably, the inner wall of the reinforcing pipe is provided with an annular cavity, and the outer wall of the reinforcing pipe is uniformly provided with through holes that communicate with the annular cavity.

[0009] Preferably, the reinforcing pipe has a sliding connection to the reinforcing rod. During the construction of the upper tunnel, the reinforcing rod connects upward to the corresponding segment of the upper tunnel. The reinforcing rod has a connecting groove on one side, and the outer surface of the segment has a groove. During the installation of the segment, the segment and the reinforcing rod undergo relative displacement, which causes the connecting groove of the reinforcing rod to be stuck on the side wall of the groove.

[0010] Preferably, a support device is provided on the inner top of the lower tunnel. The support device includes an arc-shaped plate, with arc-shaped brackets connected to both ends of the arc-shaped plate. The other end of each arc-shaped bracket extends into the process tank. Multiple pads are fixedly connected to the arc-shaped plate. The pads are correspondingly set with the reinforcing pipes. Sensors are provided on the pads, and the sensors are correspondingly set with the reinforcing rods.

[0011] The beneficial effects of this invention are as follows: This invention constructs an arc-shaped support layer using arc-shaped support rods and anchor piles, transferring part of the settlement force generated by the upper tunnel and reinforced soil to the ground surface or deep stable strata. This effectively blocks concentrated pressure on the lower tunnel arch and prevents deformation of the lower tunnel segments due to vertical overload. In later stages, grouting can be added through the central hole of the reinforcement rod, enabling proactive control of segment deformation during operation. The support device at the top of the lower tunnel provides auxiliary support for the reinforcement pipe and can also detect the deformation of the upper tunnel segments in real time through sensors, providing early warning of tunnel segment deformation, which is beneficial for operational safety management and maintenance decisions. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the basic structure of the present invention; Figure 2 yes Figure 1 A schematic diagram of the basic structure of a medium without geological layers; Figure 3 yes Figure 2 Enlarged view of N points; Figure 4 yes Figure 2 Enlarged view at point M; Figure 5This is a schematic diagram of the basic structure of the reinforced pipe; Figure 6 yes Figure 2 Main view Figure 7 This is a schematic diagram of the connection structure between the reinforcing rod and the segment. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0014] like Figures 1-4 As shown in the figure, this embodiment provides a deformation-resistant reinforcement device for stacked tunnel segments, including a lower tunnel 100 and an upper tunnel 200 that are vertically aligned, stacked vertically on top of each other. Two sets of process trenches 1 are opened within the lower tunnel 100, located on either side of the upper tunnel 200's projection area below it. Each set of process trenches 1 consists of two trenches, symmetrically positioned on both sides of the lower tunnel 100. Support plates are used within the process trenches 1 to ensure the circumferential stability of the tunnel at the trench locations. In the same set of process trenches 1, an arc-shaped hole is drilled from one process trench 1 to the other using a directional drill. The arc-shaped hole passes through the soil above the lower tunnel 100. An arc-shaped support rod 3 is installed within the arc-shaped hole, with anchor piles 300 installed at both ends of the arc-shaped support rod 3, extending upwards to the ground surface. In actual construction, the anchor piles 300 are driven downwards from the stable strata of the ground. The specific construction method is existing technology and will not be described in detail here. Thus, the arc-shaped support rod 3, together with the anchor piles 300 at both ends, forms an arc-shaped tension support layer, which can transfer part of the vertical load from the direction of the upper tunnel 200 to the ground, thereby forming a pressure blocking zone at the top of the lower tunnel 100.

[0015] To enhance the direct support capacity of the upper tunnel 200, multiple sets of installation holes are drilled upwards in the lower tunnel 100. Each set contains two installation holes, which are arranged in a staggered pattern. A reinforcing pipe 2 is installed in each installation hole, with the intersection point located directly below the upper tunnel 200. Corresponding locking blocks 21 and slots are provided on the reinforcing pipe 2. The two corresponding reinforcing pipes 2 are connected together through the locking blocks 21 and slots, forming a "scissor"-shaped support fork. This "scissor"-shaped support fork forms a row of high-rigidity oblique support structures in the soil below the upper tunnel 200, effectively distributing the downward load of the upper tunnel 200 and suppressing its settlement and deformation. Multiple clearance holes are provided on the arc-shaped support rod 3, with each clearance hole corresponding to a reinforcing pipe 2, through which the reinforcing pipe 2 passes. In this way, the three pairs of arc-shaped support rods provide active restraint and support for the "scissor"-shaped support forks, further improving the reliability of the support for the upper tunnel 200.

[0016] The reinforcing pipe 2 has an annular cavity 22 inside its wall, and through holes 23 connected to the annular cavity 22 are evenly distributed on its outer wall. Grouting is performed inside the annular cavity 22 of the reinforcing pipe 2. After entering the annular cavity 22, the concrete reinforcing grout seeps into the surrounding soil through the through holes 23, consolidating and improving the soil's mechanical properties, increasing its bearing modulus, and thus more effectively supporting the upper tunnel 200. A reinforcing rod 4 is slidably connected inside the reinforcing pipe 2. During the construction of the upper tunnel 200, the reinforcing rod 4 connects upwards to the corresponding segment 201 of the upper tunnel 200. A connecting groove 41 is provided on one side of the reinforcing rod 4, and a groove 202 is provided on the outer surface of the segment 201. During the installation of the segment 201, relative displacement occurs between the segment 201 and the reinforcing rod 4, causing the connecting groove 41 of the reinforcing rod 4 to engage with the side wall of the groove 202. During the secondary grouting of the upper tunnel 200, the grout fills the groove 202, firmly connecting the segment 201 and the reinforcing rod 4 into one unit. A central hole is opened inside the reinforcing rod 4. If the segment 201 is subsequently monitored to show a tendency to settle or bulge, concrete grout can be injected through the central hole of the reinforcing rod 4. The grout diffuses and hardens around the segment 201, thereby inhibiting further deformation of the segment 201.

[0017] A support device 5 is provided on the inner top of the lower tunnel 100. The support device 5 includes an arc-shaped plate 51, with arc-shaped brackets 52 connected to both ends of the arc-shaped plate 51. The other end of each arc-shaped bracket 52 extends into the process tank 1 and is fixed inside the process tank 1. Multiple pads 53 are fixedly connected to the arc-shaped plate 51. The pads 53 are correspondingly set with the reinforcing pipe 2 and directly abut against the reinforcing pipe 2, providing auxiliary vertical support and improving the overall stability of the "scissor"-shaped support fork. Sensors are provided on the pads 53 and are correspondingly set with the reinforcing rods 4. Once the upper tunnel 200 sinks, the pressure of the reinforcing rods 4 acting on the sensors will change accordingly, thereby realizing real-time detection of the settlement deformation of the upper tunnel and facilitating early maintenance measures.

[0018] In this embodiment, during construction, a process trench 1 can be opened at a predetermined position in the lower tunnel 100 and the support can be completed. Then, arc-shaped holes and installation holes are drilled, and arc-shaped support rods 3, anchor piles 300 and reinforcing pipes 2 are inserted in sequence. Then, the reinforcing rods 4 are connected to the upper tunnel segments 201, and finally the support device 5 is installed.

[0019] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for reinforcing stacked tunnel segments to prevent deformation, characterized in that: The system includes a lower tunnel (100) and an upper tunnel (200) stacked together. Two sets of process trenches (1) are opened in the lower tunnel (100). The two sets of process trenches (1) are located on both sides below the upper tunnel (200). Each set of process trenches (1) consists of two trenches. The two process trenches (1) are symmetrically located on both sides of the lower tunnel (100). The process trenches (1) are supported by support plates. In the same set of process trenches (1), an arc-shaped hole is drilled from one of the process trenches (1) to the other process trench (1). The arc-shaped hole passes over the lower tunnel (100). An arc-shaped support rod (3) is installed in the arc-shaped hole. An anchor pile (300) is installed at both ends of the arc-shaped support rod (3). The anchor pile (300) extends upward to the ground. The lower tunnel (100) drills multiple sets of installation holes upwards. Each set of installation holes consists of two holes, and the two installation holes in the same set are arranged in a cross pattern. Each installation hole is equipped with a reinforcing pipe (2), and a reinforcing rod (4) is slidably connected inside the reinforcing pipe (2). The inner top of the lower tunnel (100) is provided with a support device (5). The support device (5) includes an arc plate (51). Both ends of the arc plate (51) are connected to arc brackets (52). The other end of each arc bracket (52) extends into the process groove (1). Multiple pads (53) are fixedly connected on the arc plate (51). The pads (53) are correspondingly arranged with the reinforcing pipe (2). The pads (53) are provided with sensors. The sensors are correspondingly arranged with the reinforcing rod (4).

2. The anti-deformation reinforcement device for stacked tunnel segments according to claim 1, characterized in that: Two corresponding reinforcing pipes (2) are arranged in a cross manner, and the intersection point is located directly below the upper tunnel (200). The reinforcing pipe (2) is provided with corresponding card blocks (21) and card slots, and the two corresponding reinforcing pipes (2) are connected together through card blocks (21) and card slots.

3. The anti-deformation reinforcement device for stacked tunnel segments according to claim 2, characterized in that: The arc-shaped support rod (3) is provided with multiple clearance holes, and the reinforcing tube (2) passes through the clearance holes one by one.

4. The anti-deformation reinforcement device for stacked tunnel segments according to claim 2, characterized in that: The reinforcing tube (2) has an annular cavity (22) inside its wall and through holes (23) that communicate with the annular cavity (22) are uniformly provided on the outer wall of the reinforcing tube (2).

5. The anti-deformation reinforcement device for stacked tunnel segments according to claim 4, characterized in that: During the construction of the upper tunnel (200), the reinforcing rod (4) is connected upward to the corresponding segment (201) of the upper tunnel (200). The reinforcing rod (4) has a connecting groove (41) on one side, and the outer surface of the segment (201) has a groove (202). During the installation of the segment (201), the segment (201) and the reinforcing rod (4) undergo relative displacement, which causes the connecting groove (41) of the reinforcing rod (4) to be stuck on the side wall of the groove (202).

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