Structure for reducing floating of existing tunnel below caused by river excavation

Abstract

The utility model provides a structure for reducing floating of an existing tunnel below caused by river excavation. The structure comprises a prefabricated concrete anti-floating plate arranged above the existing tunnel. The structure further comprises a fixing assembly, one end of the fixing assembly is connected with the prefabricated concrete anti-floating plate, and the other end of the fixing assembly extends in the direction of the tunnel hole and extends into a soil body. Preformed holes are formed in the positions, corresponding to the fixing assemblies, of the prefabricated concrete anti-floating plate, and the multiple preformed holes are evenly formed and used for fixing the fixing assemblies. According to the structure for reducing upward floating of the existing tunnel below caused by river excavation, by arranging the fixing assembly, the construction process can be simpler, and maintenance is more convenient.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel protection, and in particular to a structure for reducing the floating of an existing tunnel below caused by river excavation. Background Art

[0002] Cities need to excavate rivers to improve river water quality, increase flood control capabilities, or construct waterways. With the development of urban underground rail transit networks, many river excavation projects have emerged above existing tunnels. During river excavation, unloading the material disturbs the surrounding soil, causing stress release and deformation in the soil beneath the river. This unloading and deformation of the soil causes the existing tunnel beneath to respond. In mild cases, this can cause significant longitudinal deformation in the existing tunnel, leading to defects such as water seepage and cracks. In severe cases, it can affect the use of the existing tunnel, restrict train speeds, or even cause it to be shut down, creating a public hazard.

[0003] However, in the existing technology, in order to reduce the floating of the existing tunnel below caused by the river excavation during the river excavation construction, most projects use bored piles to reinforce the existing tunnel. However, this type of fixed component has a relatively complex construction process, relatively limited geological conditions, difficult quality control, and difficult maintenance.

[0004] Therefore, there is room for further improvement in the structure of reducing the floating of the existing tunnel below caused by river excavation in the existing technology. Utility Model Content

[0005] In view of this, in order to address the technical problem that during the river excavation construction process in the above-mentioned prior art, the reinforcement of the existing tunnel by the fixed components is relatively complicated and difficult to maintain, the present application provides a structure for reducing the floating of the existing tunnel below caused by river excavation. By changing the structure of the fixed components, the fixed components extend along the direction of the tunnel hole through the reserved holes, can withstand oblique or horizontal loads, and resist the thrust and pressure of the soil by extending into the soil, which can make the construction process simpler and maintenance more convenient.

[0006] To achieve the above-mentioned object, the present application provides a structure for reducing the floating of an existing tunnel below caused by river excavation, comprising a precast concrete anti-floating plate arranged above the existing tunnel;

[0007] It also includes a fixing assembly, one end of which is connected to the precast concrete anti-floating plate, and the other end of which extends toward the tunnel hole and extends into the soil;

[0008] The precast concrete anti-floating plate is provided with reserved holes corresponding to the fixing components, and a plurality of the reserved holes are evenly arranged, and the reserved holes are used to fix the fixing components.

[0009] Compared to existing technologies, one end of the fixing assembly is connected to a precast concrete anti-floating plate, while the other end extends toward the tunnel opening and into the soil. The precast concrete anti-floating plate has pre-set holes corresponding to the fixing assembly, with multiple pre-set holes evenly spaced to secure the fixing assembly. By installing the fixing assembly, which extends into the soil toward the tunnel opening, the fixing assembly can withstand horizontal or oblique loads. Grouting is performed through the pre-set holes, simplifying construction and making maintenance easier. The fixing assembly also prevents the existing tunnel from floating or rising due to buoyancy, reducing the risk of uplift and maintaining the stability of the existing tunnel.

[0010] Furthermore, the fixing assembly includes a rod body, a locking piece and a grouting body; one end of the rod body close to the precast concrete anti-floating plate is connected to the locking piece, and the other end is connected to the grouting body;

[0011] The locking member is at least partially connected to the rod body.

[0012] Furthermore, it further comprises a washer and a nut, wherein the locking member passes through the washer and is connected to the rod body, and the washer is located above the precast concrete anti-floating plate;

[0013] The nut is connected to the locking piece, and the nut is used to fix the locking piece.

[0014] Furthermore, there are two grouting bodies, which are symmetrically arranged on both sides of the end of the rod body;

[0015] The grouting body is rectangular.

[0016] Furthermore, a temporary load is provided on the precast concrete anti-floating plate.

[0017] Furthermore, the fixing component is an anchor rod;

[0018] or,

[0019] The fixing component is a pile.

[0020] Furthermore, an anti-corrosion paint layer is applied on the top of the fixing component.

[0021] The structure of the present application for reducing the floating of an existing tunnel below caused by river excavation has at least the following technical effects:

[0022] 1. By setting a fixing component, which can be an anchor rod or a pile, the fixing component is flexible and can be adopted according to the actual situation on site; on the other hand, the anchor rod or the construction pile is not easy to squeeze the soil out, which has little disturbance on the soil and has little impact on the existing tunnel.

[0023] 2. By setting multiple reserved holes at intervals on the precast concrete anti-floating plate, on the one hand, the reserved holes are densely packed, which enables the perforation construction between the fixed components and the precast concrete anti-floating plate to be completed in a variety of different river channels and tunnel locations, thereby improving work efficiency and avoiding construction problems caused by inappropriate position or insufficient depth of a single reserved hole, thereby improving safety during the construction process; on the other hand, a large number of reserved holes can reserve an operating channel for subsequent reinforcement measures, which is conducive to reducing the dead weight of the precast concrete anti-floating plate, facilitating maintenance, and will not affect the infiltration of the soil layer after the river is irrigated, thus playing a certain positive role in the local ecological environment.

[0024] 3. By applying an anti-corrosion paint layer on the top of the fixed component, the top of the fixed component can be effectively prevented from being affected by oxidation, corrosion and rust, thereby extending the service life of the fixed component. Compared with the traditional technology of setting a waterproof device on the top of the fixed component, the construction of the waterproof device is complicated, and applying an anti-corrosion paint layer can speed up the construction, reduce the construction process, accelerate the formation of the pre-tensioning force of the fixed component, and reduce the stress release of the lower soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the arrangement of a structure for reducing the uplift of an existing tunnel below caused by river excavation, provided in one embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of a structure provided by an embodiment of the present application to reduce the floating of the existing tunnel below caused by river excavation. Figure 1 ;

[0027] Figure 3 This is a schematic diagram of a fixed component structure for reducing the floating of an existing tunnel below caused by river excavation, provided in one embodiment of the present application;

[0028] Figure 4 This is a schematic diagram of a structure provided by an embodiment of the present application to reduce the floating of the existing tunnel below caused by river excavation. Figure 2 ;

[0029] Figure 5 It is the load space relationship diagram of river channel excavation;

[0030] Figure 6 This is a schematic diagram of the structure of the precast concrete anti-floating plate in the structure for reducing the floating of the existing tunnel below caused by river excavation provided by an embodiment of the present application. Figure 1 ;

[0031] Figure 7 This is a schematic diagram of the structure of the precast concrete anti-floating plate in the structure for reducing the floating of the existing tunnel below caused by river excavation provided by an embodiment of the present application. Figure 2 ;

[0032] Figure 8 This is a schematic diagram of the overlapping structure of two adjacent precast concrete anti-floating plates, which is a structure for reducing the floating of an existing tunnel below caused by river excavation, provided by an embodiment of the present application;

[0033] Figure 9 This is a schematic diagram of a precast concrete anti-floating plate structure at a river bend, which is a structure for reducing the uplift of an existing tunnel below caused by river excavation, provided in one embodiment of the present application.

[0034] Reference numerals:

[0035] 1. Existing tunnel; 2. Precast concrete anti-floating plate; 3. Fixed components; 4. Reserved holes; 5. Temporary load; 7. Construction section;

[0036] 31. Rod body; 32. Locking piece; 33. Grouting body; 34. Gasket; 35. Nut. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is described in detail, clearly, and completely in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not intended to limit the present disclosure.

[0038] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting this application.

[0040] The present application will be described in further detail below with reference to the accompanying drawings. Figures 1 to 9 illustrate.

[0041] This embodiment provides a structure for reducing the floating of existing tunnels caused by river excavation, which is used in river excavation projects, such as Figures 1 to 9As shown, it includes a precast concrete anti-floating plate 2 and a fixing component 3. The precast concrete anti-floating plate 2 is arranged above the existing tunnel 1. The precast concrete anti-floating plate 2 is a prefabricated concrete anti-floating plate, which is convenient for on-site installation and use. It is made by arranging steel bars and then pouring concrete. The precast concrete anti-floating plate 2 can effectively maintain the stability of the existing tunnel 1 through its own weight and structural design, and can also distribute the load to reduce the possibility of load concentration in local areas; wherein, during the river channel excavation process, the length of the construction section 7 is determined according to the size of the precast concrete anti-floating plate 2. The main function is to reduce the area of ​​a single excavation, thereby reducing the stress release of local soil, and can ensure that the size and quality of each construction section 7 meet the requirements, thereby improving the quality and stability of the overall project, and can reduce the risk of size mismatch or adjustment difficulties during construction, thereby improving construction efficiency. One end of the fixing component 3 is connected to the precast concrete anti-floating plate 2, and the other end extends toward the tunnel hole and extends into the soil. The anchoring components are arranged on both sides of the tunnel hole. The anchoring components are inclined or extended vertically. The fixing component 3 is an anchor rod or a pile. The fixing component 3 can be adopted according to the actual situation of the construction site. The fixing component 3 is highly flexible and not easy to squeeze the soil out. It has little disturbance to the soil and little impact on the existing tunnel 1. The fixing component 3 increases the anti-floating ability of the foundation through the friction with the surrounding soil, preventing the foundation from floating under the action of external loads. The fixing component 3 can also improve the overall stability of the structure, prevent the structure from tilting or displacing under the action of external loads, thereby ensuring the safe operation of the structure, making the construction process simpler and maintenance more convenient.

[0042] Specifically, such as Figures 6 and 7 As shown, the precast concrete anti-floating plate 2 is provided with a temporary load 5 and a plurality of reserved holes 4, and the plurality of reserved holes 4 are evenly arranged, and the reserved holes 4 are a circular structure or a square structure. The reserved holes 4 are used to fix the fixing components 3. On the one hand, the reserved holes 4 are dense, which can make it possible to complete the perforation construction between the fixing components 3 and the precast concrete anti-floating plate 2 in a variety of different river channels and tunnel locations, thereby improving work efficiency and avoiding construction problems caused by inappropriate position or insufficient depth of a single reserved hole 4, thereby improving safety during the construction process; on the other hand, there are more reserved holes 4, which can reserve an operating channel for subsequent reinforcement measures that may be taken, which is conducive to reducing the dead weight of the precast concrete anti-floating plate 2, facilitating maintenance, and will not affect the infiltration of the soil layer after the river channel is filled with water, and plays a certain positive role in the local ecological environment.

[0043] Further, such as Figure 8As shown, two adjacent precast concrete anti-floating plates 2 are overlapped with each other, and the edges of the precast concrete anti-floating plates 2 are designed to form a buckle. When the pull-out bearing capacity of the fixing component 3 is sufficient, piles can be driven only at the convex or concave precast concrete anti-floating plates 2, and the precast concrete anti-floating plates 2 in the middle position do not need to be piled, thereby reducing the use of the fixing component 3, saving construction costs, and reducing the impact of the fixing component 3 on the existing tunnel 1 during construction.

[0044] Further, such as Figure 3 As shown, the fixing assembly 3 includes a rod 31, a locking member 32, and a grouting body 33. One end of the rod 31, near the precast concrete anti-floating plate 2, is connected to the locking member 32, and the other end of the rod 31 is connected to the grouting body 33. There are two grouting bodies 33, symmetrically arranged on either side of the lower end of the rod 31. The grouting bodies 33 are rectangular in shape and increase the frictional resistance between the fixing assembly 3 and the surrounding soil or rock, thereby improving the anchoring force and enhancing the stability of the existing tunnel 1. The locking member 32 is a bolt. The fixing assembly 3 also includes a nut 35 and a washer 34. The locking member 32 at least partially passes through the washer 34 and is connected to the rod 31. The washer 34 is located above the precast concrete anti-floating plate 2 and prevents the locking member 32 from loosening under vibration or stress. The nut 35 is threadedly connected to the locking member 32. The nut 35 is arranged above the gasket 34. The nut 35 is used to fix the locking member 32. The nut 35 cooperates with the locking member 32 to achieve the connection and fixation of the locking member 32. The tightening force can also be adjusted to prevent the locking member 32 from loosening under vibration or force, thereby maintaining the stability of the fixing component 3.

[0045] Further, such as Figure 2 As shown, applying an anti-corrosion paint layer on the top of the fixing assembly 3 effectively prevents the top of the fixing assembly 3 from oxidation, corrosion, and rust, thereby increasing the durability and protection of the fixing assembly 3 and extending its service life. Compared to the traditional method of installing a waterproof device on the top of the fixing assembly 3, which is complex to construct, applying an anti-corrosion paint layer can speed up construction, reduce construction steps, accelerate the formation of pre-tensioning force on the fixing assembly 3, and reduce stress release in the underlying soil. A temporary load 5 is provided on the precast concrete anti-floating plate 2. The temporary load 5 can be a lumpy mass or river water of the same weight as the excavated soil. This improves the stability of the precast concrete anti-floating plate 2 by increasing its weight. Furthermore, during construction, the temporary load 5 provides support and stability, providing a safe working platform for construction personnel and equipment. It also allows for load testing to verify the load-bearing capacity and stability of the precast concrete anti-floating plate 2 and ensure that it meets design requirements.

[0046] The present application has been described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is intended only to help understand the present application and its core concepts. It should be noted that, without departing from the principles of the present application, a number of improvements and modifications may be made to the present application by a person skilled in the art, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A structure for reducing the floating of an existing tunnel below caused by river excavation, characterized in that: It includes a prefabricated concrete anti-floating plate (2) arranged above the existing tunnel (1); It also includes a fixing assembly (3), one end of which is connected to the precast concrete anti-floating plate (2), and the other end of which extends toward the tunnel hole and extends into the soil; The precast concrete anti-floating plate (2) is provided with a reserved hole (4) corresponding to the fixing component (3), and a plurality of the reserved holes (4) are evenly arranged, and the reserved holes (4) are used to fix the fixing component (3); The fixing assembly (3) comprises a rod body (31), a locking piece (32) and a grouting body (33); one end of the rod body (31) close to the precast concrete anti-floating plate (2) is connected to the locking piece (32), and the other end is connected to the grouting body (33); The locking member (32) is at least partially connected to the rod body (31); It also includes a washer (34) and a nut (35), the locking member (32) passes through the washer (34) and is connected to the rod body (31), and the washer (34) is located above the precast concrete anti-floating plate (2); The nut (35) is connected to the locking member (32), and the nut (35) is used to fix the locking member (32); The length of the construction section (7) is determined according to the size of the precast concrete anti-floating plate (2); Two adjacent precast concrete anti-floating plates (2) are overlapped with each other, and the edges of the precast concrete anti-floating plates (2) are designed to be concave and convex to form a buckle; An anti-corrosion paint layer is applied on the top of the fixing component (3).

2. The structure for reducing the floating of the existing tunnel below caused by river excavation according to claim 1 is characterized in that: There are two grouting bodies (33), and the two grouting bodies (33) are symmetrically arranged on both sides of the end of the rod body (31); The grouting body (33) is rectangular.

3. The structure for reducing the floating of the existing tunnel below caused by river excavation according to claim 1 is characterized in that: The prefabricated concrete anti-floating plate (2) is provided with a temporary load.

4. The structure for reducing the floating of the existing tunnel below caused by river excavation according to claim 1 is characterized in that: The fixing component (3) is an anchor rod; or, The fixing component (3) is a pile.

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