Reinforcing structure of shield tunnel crossing metro on municipal road tunnel
By adopting the interlaced arrangement of three-axis mixing piles, double-tube rotary spray piles and cast-in piles in the reinforced structure of the cross-subway shield tunnel on the municipal road tunnel, the problems of seepage at the bottom of the foundation pit and the impact of tunnel are solved, and the safety and stability of the foundation pit excavation process are improved.
Patent Information
- Application Number
- CN202422321078.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-23
AI Technical Summary
In the existing foundation pit reinforcement technology, traditional methods fail to effectively control the water seepage risk at the bottom of the foundation pit and the impact on the subway tunnel below, resulting in increased construction risks and tunnel deformation. Especially when crossing subway shield tunnels on municipal road tunnels, the structural stress is complex and the design requires increased reinforcement.
The reinforcement area is staggeredly arranged in three-axis mixing piles and double-tube rotary spray piles, and combined with the cast-injected piles, an integral reinforcement structure is formed, including the first wall and the second wall, which enhances the reinforcement of the bottom and side walls of the foundation pit. The three-axis mixing piles are staggeredly arranged in three-axis mixing piles to form the first reinforcement area, and the double-tube rotary spray piles form the second reinforcement area, and the cast-injected piles provide support.
Effectively reduce the risk of seepage and the stress of the enclosure structure during foundation pit excavation, reduce the risk of foundation pit excavation, reduce the deformation of subway tunnels, improve the rigidity and support capacity of the foundation pit bottom, and ensure construction safety.
Smart Images
Figure CN223119076U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of foundation pit reinforcement, and particularly relates to a reinforcement structure for a municipal road tunnel spanning over a subway shield tunnel. Background Technique
[0002] With the large-scale development of urban underground space, complex mutual influences have occurred among new and old underground engineering structures constructed at different depth levels, different spatial position relationships, and different development periods. Under this background, when new underground projects (such as municipal road tunnels, underground utility tunnels, etc.) are under construction with open-cut deep foundation pits, the influence on the underlying existing tunnel structure becomes a typical working condition.
[0003] In the existing foundation pit reinforcement technologies, such as traditional steel support structures, prestressed anchor reinforcement systems, diaphragm walls, shotcrete, and combined reinforcement systems, they mainly focus on the support and reinforcement of the foundation pit sidewalls, while neglecting the reinforcement treatment of the foundation pit bottom, making it difficult to effectively control the influence of new underground projects on existing tunnel structures during construction. The specific problems are as follows: 1. Structural stress problem: Under the geological conditions of deep soft foundation, due to the lack of reinforcement at the foundation pit bottom, when the foundation pit retaining structure bears the earth pressure, its stress state is more complex, resulting in the need to increase the amount of reinforcement in the structural design to ensure stability; 2. Water seepage and construction risk: The lack of reinforcement at the foundation pit bottom makes it difficult to effectively control the groundwater seepage problem, which not only increases the risk during the foundation pit excavation process but also may lead to construction delays, affecting the progress and quality of the entire project; 3. Influence on the underlying structure: Especially in the construction of a municipal tunnel foundation pit spanning over a subway tunnel, the traditional reinforcement methods fail to fully consider the influence on the underlying subway tunnel, which may cause serious disturbance to the tunnel structure, resulting in tunnel deformation and even leading to safety accidents.
[0004] In order to solve the above problems, it is necessary to reinforce the foundation pit sidewalls and focus on the reinforcement treatment of the foundation pit bottom. Therefore, it is a problem that needs to be solved by those skilled in the art to propose an innovative reinforcement structure. Content of the Utility Model
[0005] In order to solve the problems in the above background technique, the utility model provides a reinforcement structure for a municipal road tunnel spanning over a subway shield tunnel, which not only considers the reinforcement of the foundation pit sidewalls but also focuses on the reinforcement treatment of the foundation pit bottom.
[0006] To achieve the above object, the utility model provides a reinforcement structure for a municipal road tunnel spanning over a subway shield tunnel, which includes a first wall and a second wall. A first reinforcement area is arranged between the first wall and the second wall. The first reinforcement area is located below the municipal road tunnel and above the subway shield tunnel. The center line of the first reinforcement area coincides with the center line of the municipal road tunnel. The first reinforcement area is formed by multiple overlapping and staggered triple-axis mixing piles. Second reinforcement areas are arranged at the joints of the first reinforcement area with the first wall and the second wall, and cast-in-place piles are arranged below the first reinforcement area.
[0007] Further, the cast-in-place piles are embedded and connected with the first reinforcement area.
[0008] Further, the cast-in-place piles are arranged at intervals along the center line direction of the municipal road tunnel or the center line direction of the subway shield tunnel.
[0009] Further, the second reinforcement area is formed by multiple overlapping and staggered double-tube jet grouting piles.
[0010] Further, both the first reinforcement area and the second reinforcement area are reinforced to a depth of more than four meters below the foundation base.
[0011] Further, the first reinforcement area is reinforced to the top of the solid piles in the subway shield tunnel section.
[0012] Further, the second reinforcement area is constructed after the construction of the first wall, the second wall, and the first reinforcement area is completed.
[0013] Further, both the first wall and the second wall are reinforced concrete diaphragm walls.
[0014] Further, the first wall and the second wall are arranged parallel to the center line of the subway shield tunnel or the center line of the municipal road tunnel.
[0015] Compared with the prior art, the utility model has the following advantages:
[0016] 1. The reinforcement structure of the utility model can form effective stiffness at the foundation base through the first reinforcement area and the second reinforcement area, thus playing the role of a top enclosure structure and reducing the stress and reinforcement of the enclosure structure.
[0017] 2. The first reinforcement area formed by overlapping and staggered triple-axis mixing piles in the reinforcement structure of the utility model can effectively play the role of water isolation at the foundation base during the foundation pit excavation process, thus reducing the risk of foundation pit excavation.
[0018] 3. When the subway shield tunnel has been completed, using the reinforcement structure of the utility model can increase the weight of the overburden soil above the shield tunnel, thus reducing the deformation of the shield tunnel during the foundation pit excavation process. Description of the Drawings
[0019] The preferred embodiments of the present utility model will be described below in conjunction with the drawings, in which:
[0020] Figure 1 is a schematic cross-sectional structure diagram of the reinforcement structure provided in this embodiment;
[0021] Figure 2 is a schematic diagram of the distribution of cast-in-place piles of one section of the reinforcement structure provided in this embodiment;
[0022] Figure 3 is a schematic diagram of the structure of the first reinforcement area provided in this embodiment;
[0023] Figure 4 is Figure 3 a partial enlarged view of the position A in
[0024] List of Reference Numerals:
[0025] 1. First wall; 2. Second wall; 3. First reinforcement area; 4. Second reinforcement area; 5. Cast-in-place pile; 6. Municipal road tunnel; 7. Subway shield tunnel. Detailed Embodiments
[0026] The drawings are only for illustrative purposes and should not be construed as limiting the present utility model; it should be clear that the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the embodiments of the present utility model.
[0027] The terms used in the embodiments of the present utility model are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present utility model. The singular forms of "a", "the" and "said" used in the embodiments of the present utility model and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.
[0028] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims. In the description of the present invention, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0029] In addition, in the description of the present invention, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0031] As Figures 1-4 shown, this embodiment provides a technical solution: a reinforcement structure for a municipal road tunnel spanning over a subway shield tunnel, including a first reinforcement area 3, a first wall 1, a second wall 2, and a second reinforcement area 4 provided in a foundation pit. The first wall 1 and the second wall 2 are respectively located outside the first reinforcement area 3 and are arranged at intervals from the first reinforcement area 3 at the edge of the foundation pit. The municipal road tunnel 6 is constructed above the first reinforcement area 3, and the center line of the first reinforcement area 3 coincides with the center line of the municipal road tunnel 6. The first reinforcement area 3 is constructed above the subway shield tunnel 7.
[0032] Under normal circumstances, both the first wall 1 and the second wall 2 are parallel to the center line of the municipal road tunnel 6. However, at the intersection or separation of the subway shield tunnel 7 and the municipal road tunnel 6, at this time, the subway shield tunnel 7 and the municipal road tunnel 6 are no longer completely coincident. Referring to Figure 2 , the subway shield tunnel 7 can be regarded as extending from one side of the bottom of the municipal road tunnel 6. At this time, the first wall 1 or the second wall 2 on this side is parallel to the center line of the subway shield tunnel 7 to enhance the stability of the overall structure.
[0033] The first wall 1 and the second wall 2 are connected by the second reinforcement area 4 to the first reinforcement area 3, forming an integral reinforcement structure. The second reinforcement area 4 is located at the connection of the first reinforcement area 3 with the first wall 1 and the second wall 2, close to the first reinforcement area 3 and the walls, enhancing the stability of the overall structure.
[0034] Below the first reinforcement area 3, cast-in-place bored piles 5 are constructed. Usually, the bored piles 5 are arranged on both sides of the center line of the municipal road tunnel 6. The bored piles 5 are arranged at intervals along the center line direction of the municipal road tunnel 6. However, at the intersection or separation of the subway shield tunnel 7 and the municipal road tunnel 6, at this time, the subway shield tunnel 7 and the municipal road tunnel 6 are no longer completely coincident. Refer to Figure 2 , the subway shield tunnel 7 can be regarded as extending from one side of the bottom of the municipal road tunnel 6. At this time, the bored piles 5 in this section are arranged at intervals along the center line direction of the subway shield tunnel 7 to improve the support capacity of the foundation pit bottom.
[0035] Both the first wall 1 and the second wall 2 are reinforced concrete diaphragm walls, providing reinforcement and support for the side walls of the foundation pit.
[0036] Combined with Figure 1 、 3 As shown in 4, the first reinforcement area 3 uses a triple-axis mixing pile machine to construct triple-axis mixing piles. Multiple triple-axis mixing piles are arranged staggeredly along the periphery of the first wall 1 and the second wall 2 and inside the first reinforcement area 3. The adjacent triple-axis mixing piles in the front, back, left, and right are overlapped with each other, forming the first reinforcement area 3 with a rectangular cross-section shape.
[0037] Combined with Figure 1 、 3 As shown in 4, the second reinforcement area 4 uses double-fluid jet grouting piles. Multiple double-fluid jet grouting piles are arranged staggeredly along the periphery of the first wall 1 and the second wall 2 to form a double-fluid jet grouting pile row. The double-fluid jet grouting pile row is the second reinforcement area 4 with a rectangular cross-section shape.
[0038] The first reinforcement area 3 is reinforced to the top of the solid piles in the subway shield tunnel 7 section to ensure the reinforcement effect; the second reinforcement area 4 is reinforced to more than four meters below the foundation bottom to provide sufficient support force.
[0039] Using the reinforcement structure of the above embodiment for reinforcement, no water gushing or sand boiling phenomenon occurred during the foundation pit excavation process, forming an effective stiffness at the foundation bottom, thus playing the role of the top enclosure structure, reducing the stress and reinforcement of the enclosure structure; it can effectively play the role of water isolation at the foundation bottom during the foundation pit excavation process, thereby reducing the risk of foundation pit excavation; when the subway shield tunnel has been completed, using the reinforcement structure of this embodiment can increase the weight of the overburden soil above the shield tunnel, thereby reducing the deformation of the shield tunnel during the foundation pit excavation process.
[0040] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.
Claims
1. A reinforcement structure for a municipal road tunnel spanning over a subway shield tunnel, comprising a first wall and a second wall, characterized in that, A first reinforcement area is arranged between the first wall and the second wall. The first reinforcement area is located below the municipal road tunnel and above the subway shield tunnel. The center of the first reinforcement area coincides with the center line of the municipal road tunnel. The first reinforcement area is formed by arranging multiple triple-axis mixing piles in an interlaced manner. Second reinforcement areas are arranged at the joints of the first reinforcement area with the first wall and the second wall. A cast-in-place pile is arranged below the first reinforcement area.
2. The reinforcement structure for a municipal road tunnel spanning over a subway shield tunnel according to claim 1, wherein The cast-in-place pile is embedded and connected with the first reinforcement area.
3. The reinforcement structure for an urban road tunnel spanning over a subway shield tunnel according to claim 1, wherein The cast-in-place piles are arranged at intervals along the center line direction of the municipal road tunnel or the center line direction of the subway shield tunnel.
4. The reinforcement structure for a municipal road tunnel spanning over a subway shield tunnel according to claim 1, characterized in that, The second reinforcement area is formed by arranging multiple double-tube jet grouting piles in an interlaced manner.
5. The reinforcement structure of the municipal road tunnel straddling the subway shield tunnel according to claim 1, characterized in that, Both the first reinforcement area and the second reinforcement area are reinforced to a depth of more than four meters below the foundation base.
6. The reinforcement structure for a municipal road tunnel spanning over a subway shield tunnel according to claim 1, characterized in that, The first reinforcement area is reinforced to the top of the solid pile in the subway shield tunnel section.
7. The reinforcement structure for a municipal road tunnel spanning over a subway shield tunnel according to claim 1, wherein, Both the first wall and the second wall are reinforced concrete diaphragm walls.
8. The reinforcement structure of the municipal road tunnel straddling the subway shield tunnel according to claim 1, characterized in that, The first wall and the second wall are arranged parallel to the center line of the subway shield tunnel or the center line of the municipal road tunnel.