River levee settlement control structure based on shield tunnel undercrossing river channel
By setting up steel pipe piles in the reinforcement area of the river embankment and using the raft plate connection, the problem of the river embankment is caused by the river embankment under construction under the construction of the shield tunnel, and the effect of simplification of construction and stability of the river embankment is achieved.
Patent Information
- Application Number
- CN202421181356.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-28
AI Technical Summary
When the shield tunnel is constructed, the river embankment will settle, and the existing isolation structure is complex and affects the safety of the tunnel structure.
Set up reinforcement holes in the foundation of the reinforced area, place the hollow steel pipe and fill the concrete to form a steel pipe pile. The bottom of the steel pipe pile is deep into the foundation of the river embankment. The steel pipe pile is rectangular in the reinforcement area, and all steel pipe piles are connected to the whole.
The construction process is simplified, the difficulty and cost of construction are reduced, the impact of shield construction on the river embankment is effectively prevented, and the embankment is avoided.
Smart Images
Figure CN222413101U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of urban tunnel construction, and more specifically to a river bank reinforcement structure based on a shield tunnel passing under a river channel. Background Art
[0002] With the large-scale construction of subways, it is inevitable that many shield tunnels will pass under rivers. The construction of shield tunnels will cause deformation of the surrounding soil, resulting in river bank settlement, and in severe cases, river bank collapse, which will endanger the lives and property of surrounding residents. In the existing technology, the effect of adding isolation structures around shield construction tunnels is better in controlling the impact of shield construction on river bank settlement. However, this isolation structure is complex to construct and will affect the overall structural safety and stability of the shield tunnel. Utility Model Content
[0003] The utility model aims to avoid the deficiencies of the above-mentioned prior art and to provide a river bank settlement control structure based on a shield tunnel passing under a river channel, so as to simplify the construction process and effectively prevent the shield construction from affecting the river bank, thereby fundamentally solving the problem of river bank settlement.
[0004] The utility model adopts the following technical solutions to solve the technical problems:
[0005] The utility model is characterized in that a river bank settlement control structure based on a shield tunnel passing under a river channel is as follows: reinforcement holes are set in the foundation fill of a reinforcement area, hollow steel pipes are placed in the reinforcement holes, concrete is filled in the hollow steel pipes to form steel pipe piles, the bottoms of the steel pipe piles penetrate below the foundation of the river bank, and the tops of the steel pipe piles are flush with the surface of the river bank; the steel pipe piles are arranged in a rectangular shape in the reinforcement area and are axially symmetrically distributed with respect to the central axis of the tunnel; concrete is poured on the tops of the steel pipe piles to form a raft slab, and all the steel pipe piles are connected into a whole by the raft slab.
[0006] The utility model is also characterized by a riverbank settlement control structure based on a shield tunnel passing through a river channel, in which a most susceptible settlement area is divided in the reinforced area, and the distribution density of the steel pipe piles in the most susceptible settlement area is greater than the distribution density of the steel pipe piles outside the most susceptible settlement area.
[0007] The utility model is also characterized by the riverbank settlement control structure based on the shield tunnel passing through the river channel: outside the most susceptible settlement area, the distribution density of the steel pipe piles from near to far from the edge of the most susceptible settlement area gradually decreases.
[0008] The utility model is also characterized in that the center distance of the steel pipe piles arranged between the most susceptible settlement areas is not greater than 1.5m.
[0009] The utility model is also characterized in that the riverbank settlement control structure based on the shield tunnel passing through the river channel is characterized in that the steel pipe piles are made of multiple hollow steel pipes welded section by section.
[0010] The utility model is also characterized in that the riverbank settlement control structure based on the shield tunnel passing through the river channel is: the diameter of the hollow steel pipe is 300 mm and the wall thickness is 10 mm.
[0011] The utility model is also characterized by a river embankment settlement control structure based on a shield tunnel passing through a river channel. The reinforcement area is based on the longitudinal direction of the shield tunnel as the length direction and the transverse direction of the shield tunnel as the width direction. The most susceptible area to settlement in the reinforcement area is determined as follows: in the length direction, the estimated settlement value located at the river embankment bank is the largest, and the estimated settlement value decreases in the direction away from the river embankment bank; in the width direction, the estimated settlement value above the central axis is the largest, and the estimated settlement value decreases in the direction away from the river embankment bank. The width of the area with a greater impact is 10m, and the river embankment most susceptible to settlement area is obtained by combining the width and length.
[0012] Compared with the prior art, the beneficial effects of the utility model are embodied in:
[0013] 1. The utility model has a simple structure, low construction difficulty and is easy to implement;
[0014] 2. The utility model uses raft plates to connect all steel pipe piles into a whole, so that the reinforcement structure is stable and the force is evenly and reliably applied, which can effectively prevent the shield construction from passing through the river channel and affect the river bank, thus avoiding the settlement of the river bank;
[0015] 3. The utility model adopts different density distribution of steel pipe piles inside and outside the most prone to settlement area, which simplifies the construction process while ensuring the stability of the structure, reduces the amount of steel pipe piles, reduces the cost of consumables, reduces construction costs, speeds up the project progress, and meets the requirements of green engineering construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the elevation structure of the utility model;
[0017] Figure 2 This is a schematic diagram of the planar structure of the utility model;
[0018] Numbers in the figure: 1 river bank; 2 reinforcement hole; 3 steel pipe piles; 4 raft; 5 tunnel; 6 river; 7 area most prone to settlement; 8 reinforcement area. DETAILED DESCRIPTION
[0019] See also Figure 1 and Figure 2In this embodiment, the river bank settlement control structure based on the shield tunnel under the river channel is to set a reinforcement hole 2 in the foundation fill of the reinforcement area 8, insert a hollow steel pipe 3 in the reinforcement hole 2, fill the hollow steel pipe 3 with concrete to form a steel pipe pile, the bottom of the steel pipe pile goes deep below the foundation of the river bank 1, and the top of the steel pipe pile is flush with the embankment surface of the river bank 1; the steel pipe piles are arranged in a rectangular shape in the reinforcement area 8, and are axially symmetrically distributed with the central axis of the tunnel 5; a 200mm concrete layer is poured on the top of the steel pipe pile to form a raft 4, and the raft 4 connects all the steel pipe piles into a whole.
[0020] In specific implementation, the corresponding technical measures also include:
[0021] The most susceptible area to settlement 7 is divided into the reinforced area 8, and the distribution density of the steel pipe piles in the most susceptible area to settlement 7 is greater than the distribution density of the steel pipe piles outside the most susceptible area to settlement 7; outside the most susceptible area to settlement 7, the distribution density of the steel pipe piles decreases gradually from near to far from the edge of the most susceptible area to settlement 7.
[0022] The center distance of the steel pipe piles arranged in the most susceptible area 7 to settlement is not greater than 1.5m, preferably 1.5m; the center distance of the steel pipe piles outside the most susceptible area 7 to settlement can be 2.0m and 2.2m. The steel pipe piles are made of multiple hollow steel pipes welded in sections; the diameter of the hollow steel pipe is 300mm and the wall thickness is 10mm.
[0023] In a specific implementation, the reinforcement area 8 is determined in the following manner with the longitudinal direction of the shield tunnel as the length direction and the transverse direction of the shield tunnel as the width direction:
[0024] According to the settlement law of the shield tunnel in the longitudinal direction, the settlement deformation of the river bank caused by stratum loss is characterized by formula (1):
[0025]
[0026] In formula (1):
[0027] x1 is the distance from the river bank in the length direction; h is the tunnel depth; a is the soil strength loss efficiency; S1 is the surface settlement value at the position x1 which is the distance from the river bank in the length direction.
[0028] According to the lateral settlement law of the shield tunnel, the settlement deformation of the river bank caused by stratum loss is characterized by formula (2):
[0029]
[0030] In formula (2):
[0031] x2 is the distance from the tunnel centerline in the width direction; R is the radius of the tunnel; S2 is the ground settlement value at the position x2 away from the tunnel centerline in the width direction; i is the settlement trough width coefficient, which refers to the distance from the inflection point of the settlement trough curve to the tunnel centerline; V l It is the formation loss rate, which refers to the percentage of formation loss per unit length to the volume per unit length.
[0032] Thus, the scope of the area 7 most susceptible to settlement is determined: in the length direction, the estimated settlement value is the largest at the river bank, and the estimated settlement value decreases in the direction away from the river bank; in the width direction, the estimated settlement value is the largest above the central axis of the shield tunnel, and the estimated settlement value decreases in the direction away from the river bank. The width of the area with a greater impact is 10m.
[0033] The specific construction is carried out in the following steps:
[0034] Step 1: determine the scope of the area most susceptible to settlement 7;
[0035] Step 2: Use a drilling machine to drive the hollow steel pipe into the reinforcement hole 2 section by section, and weld each section of the hollow steel pipe together;
[0036] Step 3: Fill the hollow steel pipe with concrete from the top to the inside, and form a steel pipe pile after the concrete solidifies;
[0037] Step 4: Pour a layer of 200mm concrete on the top of the steel pipe pile to form a raft 4, and connect all the steel pipe columns 3 into a whole.
[0038] 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. The river bank settlement control structure based on the shield tunnel under the river channel is characterized by: A reinforcement hole (2) is provided in the foundation fill of the reinforcement area (8), a hollow steel pipe (3) is placed in the reinforcement hole (2), and concrete is filled in the hollow steel pipe (3) to form a steel pipe pile, the bottom of the steel pipe pile is deep below the foundation of the river bank (1), and the top of the steel pipe pile is flush with the embankment surface of the river bank (1); the steel pipe piles are arranged in a rectangular shape in the reinforcement area (8) and are axially symmetrically distributed about the central axis of the tunnel (5); concrete is poured on the top of the steel pipe piles to form a raft (4), and the raft (4) connects all the steel pipe piles into a whole; the most susceptible settlement area (7) is divided in the reinforcement area (8), and the distribution density of the steel pipe piles in the most susceptible settlement area (7) is greater than the distribution density of the steel pipe piles outside the most susceptible settlement area (7).
2. The riverbank settlement control structure based on a shield tunnel passing through a river according to claim 1, characterized in that: Outside the area most susceptible to settlement (7), the distribution density of the steel pipe piles decreases gradually from near to far from the edge of the area most susceptible to settlement (7).
3. The riverbank settlement control structure based on a shield tunnel passing through a river according to claim 1, characterized in that: The center distance of the steel pipe piles arranged between the most susceptible settlement areas (7) is not greater than 1.5 m.
4. The riverbank settlement control structure based on a shield tunnel passing through a river according to claim 1, characterized in that: The steel pipe piles are made of multiple hollow steel pipes welded section by section.
5. The riverbank settlement control structure based on a shield tunnel passing through a river channel according to claim 1, characterized in that: The diameter of the hollow steel pipe is 300 mm and the wall thickness is 10 mm.
6. The riverbank settlement control structure for a shield tunnel under a river according to claim 1, characterized in that: The reinforcement area (8) has a length direction along the longitudinal direction of the shield tunnel and a width direction along the transverse direction of the shield tunnel; the most susceptible area (7) to settlement in the reinforcement area (8) is determined as follows: in the length direction, the estimated settlement value located at the river bank is the largest, and the estimated settlement value decreases in the direction away from the river bank; in the width direction, the estimated settlement value above the central axis is the largest, and the estimated settlement value decreases in the direction away from the river bank, and the most susceptible area of the river bank to settlement is obtained by combining the width and length.