Open cut structure and method for sinking through an existing channel

Abstract

The application discloses a kind of open cut structure and method of sinking through present channel, which comprises the following steps: determining the implementation line of newly-built channel, determining the first preset position of first temporary support wall and the second preset position of second temporary support wall according to the excavation range of newly-built channel; vertically excavating soil at the first preset position, and full-filling excavation to the bottom of existing structure to form the first temporary support wall; after the strength of the first temporary support wall is stable, vertically excavate the soil at the second preset position, and full-filling excavation to the bottom of existing structure to form the second temporary support wall; after the strength of the second temporary support wall is stable, use the first and second temporary support walls as the supporting foundation of existing structure, and excavate the soil at the bottom of existing structure; after the bottom soil excavation is completed, construct the main body of the channel. The application is convenient for design and construction, and the construction period and cost are easy to control. It can be applied to situations with limited site, limited construction period and cost, and high operation and maintenance requirements.

Description

Technical Field

[0001] This invention relates to the field of open-cut method for constructing underground trenches, and particularly to an open-cut structure and method for sinking through existing trenches. Background Technology

[0002] With rapid economic development and accelerating urbanization, infrastructure construction has become increasingly important. The development and construction of underground space offers a new approach to social progress and economic development, improving the urban ecological environment, conserving land resources, and protecting urban culture and historical landscapes. However, the numerous underground structures, complex pipelines, and unclear geological conditions present significant challenges to the development of underground space.

[0003] When a design plan intersects with an existing trench, current technologies mostly employ open-cut overpass methods or trenchless methods such as pipe jacking or pipe-pulling for sunken crossing. However, these methods are only applicable to most situations and are not suitable for situations with limited space, time and cost constraints, or high operation and maintenance requirements.

[0004] For example, one of the existing technologies:

[0005] When the design plan intersects with an existing trench, existing technology adjusts the design alignment as much as possible to avoid it. When avoidance conditions are not met, open-cut overpass or trenchless underpass (using technologies such as pipe pulling and pipe jacking) are often used to cross the existing trench. The above solutions have the following drawbacks:

[0006] (1) The avoidance plan for adjusting the alignment will be constrained by factors such as site conditions, plan, and construction period.

[0007] (2) The cut-and-cover overpass scheme will be limited by the overpass space.

[0008] (3) When using the pipe jacking scheme, the limited length of the crossing section cannot meet the spatial requirements for the starting and receiving of the pipe jacking scheme, and it requires a lot of construction time and money.

[0009] (4) When the pipe-dragging scheme is implemented, it cannot meet the maintenance and repair requirements of the operating unit.

[0010] Second existing technology:

[0011] By employing standardized access roads with anti-slip ribs that can be quickly assembled, the overhead load can be supported using open-cut construction techniques. Furthermore, the use of prefabricated, assembled tower crane foundations ensures rapid construction, guarantees the stability of the foundation pit, and effectively shortens the time required for structural construction after excavation. However, the above solution has the following drawbacks:

[0012] (1) The spliced ​​anti-slip rib is suitable for situations where there are no structures above. When there are important structures above the construction site, the anti-slip rib needs to be used as the foundation of the structure. Whether the anti-slip rib meets the strength requirements of the structure needs further discussion.

[0013] (2) When using prefabricated assembly technology to tunnel under existing structures, the splicing technology is difficult and the joints with the existing structures are difficult to handle, which can easily lead to unstable foundations of the upper structures and engineering accidents.

[0014] The third existing technology:

[0015] The open-cut method, constructed in phases, minimizes disruption to existing traffic and saves site space and construction costs. However, this approach has the following drawbacks:

[0016] (1) This method is applicable to situations where the structure to be built is large and there is adequate operating space above. However, if the site conditions are limited, it is necessary to consider whether this method is applicable.

[0017] (2) The scheme involves dismantling and leasing of the support system, resulting in high engineering costs.

[0018] Therefore, it is necessary to propose an open-cut method for sinking through existing trenches to meet the needs of some special application scenarios (such as limited site, time and cost constraints, and high operation and maintenance requirements). Summary of the Invention

[0019] To address the shortcomings of existing technologies, this invention provides an open-cut structure and method for sinking through existing trenches, which is convenient for design and construction, and the construction period and cost are easy to control. It is applicable to situations with limited site, time and cost constraints, and high operation and maintenance requirements.

[0020] The specific technical solution of the embodiments of the present invention is as follows:

[0021] A cut-and-cover structure for sinking through an existing trench, wherein the existing trench extends along a first direction, and a newly constructed trench extends along a second direction at a predetermined angle to the existing trench. The first intersection point is the point where the center lines of the projections of the newly constructed trench and the existing trench intersect on a first plane, which is a horizontal plane or a plane parallel to the horizontal plane. A positioning line is formed at a position perpendicular to the second direction and passing through the first intersection point. The cut-and-cover structure for sinking through the existing trench includes a first temporary support wall located on the side of the existing trench, adjacent to the existing trench. Along the second direction, one side of the first temporary support wall is flush with the positioning line, and the other side, in its projection toward the first plane, at least covers the existing ditch; a second temporary support wall is located on the other side of the newly constructed ditch along the positioning line; the second temporary support wall is located on the side of the existing ditch, adjacent to the existing ditch, and along the second direction, one side of the second temporary support wall is flush with the positioning line, and the other side, in its projection toward the first plane, at least covers the existing ditch; the ditch body is located between the first temporary support wall and the second temporary support wall.

[0022] In a preferred embodiment, the trench body includes: a base plate, a side wall disposed on the base plate, a top plate disposed on the side of the side wall opposite to the base plate, and a sealing connection layer is provided between the top plate and the lower surface of the existing trench.

[0023] In a preferred embodiment, the base plate and the side wall are integrally formed by cast-in-place.

[0024] In a preferred embodiment, the top plate is a prefabricated cover plate.

[0025] In a preferred embodiment, the sealing bonding layer is formed by grouting with 0.5:1 cement grout.

[0026] In a preferred embodiment, the precast roof slab covers the existing trench along the second direction.

[0027] A method for excavating and sinking through an existing trench, wherein the method is used to form the aforementioned excavation and sinking structure for excavating and sinking through an existing trench.

[0028] In a preferred embodiment, the open-cut method for sinking through an existing trench includes:

[0029] Determine the implementation route of the new trench, and based on the excavation range of the new trench, determine the first preset position of the first temporary support wall and the second preset position of the second temporary support wall;

[0030] The soil is vertically excavated at the first preset position and fully excavated to the bottom of the existing structure to form the first temporary support wall;

[0031] After the strength of the first temporary support wall stabilizes, the soil at the second preset position is vertically excavated and the excavation area is filled to the bottom of the existing structure to form the second temporary support wall.

[0032] After the strength of the second temporary support wall stabilizes, the first and second temporary support walls are used as the supporting foundation for the existing structure, and the soil at the bottom of the existing structure is excavated.

[0033] After the soil at the bottom of the existing structures is excavated, the main structure of the trench will be constructed.

[0034] In a preferred embodiment, the channel body construction includes:

[0035] Pour the bottom slab and side walls of the newly built trench;

[0036] After the base plate and the side wall structure are stabilized, the top plate is assembled using prefabricated cover plates;

[0037] After the top plate is assembled, cement grout is injected between the top plate and the lower surface of the existing trench to complete the project.

[0038] In a preferred embodiment, the cement grouting at the top plate specifically involves grouting with 0.5:1 cement grout, forming a sealing connection layer between the surface of the top plate and the lower surface of the existing trench.

[0039] The technical solution of the present invention has the following significant beneficial effects:

[0040] When a project requires an open-cut method to traverse an existing trench, temporary support walls can be excavated locally at suitable locations on both sides of the trench bottom, and concrete foundations can be poured to support the existing structures. Two temporary support walls are excavated and poured sequentially (the next wall is excavated and poured only after the strength of the first wall meets the design requirements). Once both temporary support walls have reached the design strength, the bottom of the existing trench is excavated, the concrete is poured, and the open-cut traverse is carried out. Overall, this open-cut method for traversing existing trenches is convenient to design and construct, and the construction period and cost are easy to control. It is suitable for situations with limited space, time and cost constraints, and high operation and maintenance requirements.

[0041] Specific embodiments of the invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Within the spirit and scope of the appended claims, embodiments of the invention include many changes, modifications, and equivalents. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0042] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0043] Figure 1 This is a flowchart illustrating the steps of an open-cut method for sinking and crossing an existing ditch, as provided in the embodiments of this application.

[0044] Figure 2 This is a plan view of an open-cut structure for sinking through an existing ditch, as provided in the embodiments of this application.

[0045] Figure 3 for Figure 2 The diagram above shows the first preset position in step S11 of a cut-and-cover method for sinking through an existing ditch provided in the embodiments of this application.

[0046] Figure 4 for Figure 2 The diagram at FF shows the second preset position of step S11 in a cut-and-cover method for sinking through an existing ditch provided in the embodiments of this application;

[0047] Figure 5 for Figure 2 The diagram above shows a construction schematic of step S12, which involves forming the first temporary support wall, in an open-cut method for sinking through an existing ditch, as provided in the embodiments of this application.

[0048] Figure 6 for Figure 2 The diagram at FF shows a construction schematic of step S13, which involves forming a second temporary support wall, in an open-cut method for sinking through an existing ditch, as provided in the embodiments of this application.

[0049] Figure 7 for Figure 2The diagram above shows a construction schematic of step S14 in a method for excavating the soil at the bottom of the existing structure on the side of the first temporary support wall in an open-cut method for sinking through an existing ditch provided in this application.

[0050] Figure 8 for Figure 2 The diagram at FF shows a construction schematic of step S14 of a method for excavating the soil at the bottom of the existing structure on the side of the second temporary support wall in an open-cut method for sinking through an existing ditch provided in this application.

[0051] Figure 9 for Figure 2 The diagram above shows a construction schematic of step S151 in an open-cut method for sinking through an existing trench provided in this application, in which the bottom slab and sidewall of the newly constructed trench are poured on the side of the first temporary support wall.

[0052] Figure 10 for Figure 2 The diagram at FF shows a construction schematic of step S151 in a method for excavating and sinking through an existing trench provided in this application, in which the bottom slab and sidewall of the newly constructed trench are poured on the side of the second temporary support wall.

[0053] Figure 11 for Figure 2 The diagram above shows a construction schematic of step S152, which involves assembling the top slab on the side of the first temporary support wall, in an open-cut method for sinking through an existing ditch provided in this application.

[0054] Figure 12 for Figure 2 The diagram at FF shows a construction schematic of step S152, in which the top slab is assembled on the side of the second temporary support wall, in a method for excavating and sinking through an existing ditch provided in the embodiments of this application.

[0055] Figure 13 for Figure 2 The diagram above shows a construction schematic of step S153 of a method for excavating and sinking through an existing trench provided in this application, in which cement grout is injected at the top slab on the side of the first temporary support wall.

[0056] Figure 14 for Figure 2 The diagram at FF shows a construction schematic of step S153 of an open-cut method for sinking through an existing ditch provided in this application, in which cement grout is injected at the top slab on the side of the second temporary support wall.

[0057] Reference numerals in the figures of this application:

[0058] 1. Existing ditch;

[0059] 2. Construct new ditches;

[0060] 3. First temporary support wall;

[0061] 31. First preset position;

[0062] 4. Second temporary support wall;

[0063] 42. Second preset position;

[0064] 5. Excavation area for the new trench;

[0065] 61. Base plate;

[0066] 62. Side walls;

[0067] 6. Cast-in-place portion;

[0068] 7. Top slab;

[0069] 8. Sealing connection layer;

[0070] X, first direction;

[0071] Y, the second direction. Detailed Implementation

[0072] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art fall within the scope defined by the appended claims.

[0073] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0075] This invention provides a method for excavating and sinking through existing trenches, which is applicable to situations with limited space, time and cost constraints, and high operation and maintenance requirements.

[0076] Please refer to the following for comprehensive information. Figure 1 and Figure 2 This application specification provides a method for open-cut excavation to traverse an existing trench. When it is necessary to excavate under an existing structure, this method for open-cut excavation to traverse an existing trench may include:

[0077] Step S11: Determine the implementation route of the newly constructed trench 2, and determine the first preset position 31 of the first temporary support wall 3 and the second preset position 42 of the second temporary support wall 4 according to the excavation range 5 of the newly constructed trench;

[0078] Step S12: Vertically excavate the soil at the first preset position 31 and fill the excavation to the bottom of the existing structure to form the first temporary support wall 3;

[0079] Step S13: After the strength of the first temporary support wall 3 has stabilized, the soil at the second preset position 42 is vertically excavated and the excavation area is filled to the bottom of the existing structure to form the second temporary support wall 4.

[0080] Step S14: After the strength of the second temporary support wall 4 has stabilized, the soil at the bottom of the existing structure is excavated, using the first temporary support wall 3 and the second temporary support wall 4 as the supporting foundation of the existing structure.

[0081] Step S15: After the soil excavation at the bottom of the existing structure is completed, the main structure of the trench is constructed.

[0082] When it is necessary to cut and excavate under an existing structure, follow these steps:

[0083] Please refer to the following: Figure 2 Step S11: Determine the implementation route of the open-cut plan. Based on the excavation range 5 of the new trench, determine the positions of the first temporary support wall 3 and the second temporary support wall 4.

[0084] The existing trench 1 extends along the first direction X. According to the open-cut plan, the extension direction of the newly constructed trench 2 (the second direction Y) can be determined. Once the extension direction of the newly constructed trench 2 is determined, the angle formed between the extension direction of the newly constructed trench 2 and the extension direction of the existing trench 1 can be determined.

[0085] Before formal construction, a plan design for the route of the new trench 2 is required. Specifically, in the plan, the intersection of the centerlines of the pre-designed new trench 2 and the existing trench 1 is the first intersection point. A positioning line is determined at a position perpendicular to the second direction Y and passing through the first intersection point. This positioning line is used to determine the position of one side of the temporary support wall. Along the second direction Y, there is an overlapping area between the existing trench and the new trench 2, and the position of the other side of the temporary support wall must at least cover this overlapping area. Through the above steps, the first preset position 31 of the first temporary support wall 3 located on one side of the new trench 2 can be determined (e.g., ...). Figure 3 (as shown) and the second preset position 42 of the second temporary support wall 4 located on the other side of the newly built trench 2 (as shown) Figure 4 (As shown).

[0086] like Figure 5 As shown, step S12: vertically excavate the soil at the first preset position 31 and fill the excavation to the bottom of the existing structure to form the first temporary support wall 3.

[0087] Since the temporary support wall needs to bear the load of the superstructure, it must have sufficient strength. In this step, the soil is excavated vertically at the location of the first temporary support wall 3, and C15 concrete is poured into the excavation area to the bottom of the existing structure to form the first temporary support wall 3, thereby ensuring that the first temporary support wall 3 has sufficient strength.

[0088] like Figure 6 As shown, in step S13: after the strength of the first temporary support wall 3 has stabilized, the soil at the second preset position 42 is vertically excavated and the excavation range is filled to the bottom of the existing structure to form the second temporary support wall 4.

[0089] In this embodiment, after the strength of the first temporary support wall 3 has stabilized, the soil at the location of the second temporary support wall 4 is vertically excavated, and C15 concrete is poured to the bottom of the existing structure to form the second temporary support wall 4. The strength of the first temporary support wall 3 can be tested using methods such as rebound testing or ultrasonic testing. Of course, other methods can be used to test the strength of the first temporary support wall 3, and are not limited to those described above. Those skilled in the art may make other modifications based on the technical essence of this application, but as long as the achieved function and effect are the same as or similar to that of this application, they should be covered within the scope of protection of this application.

[0090] When the strength of the first temporary support wall 3 is determined to be greater than the preset strength using a strength testing method, it indicates that the strength of the first temporary support wall 3 is stable, and at this time, the second temporary support wall 4 on the other side can be constructed.

[0091] like Figure 7 and Figure 8 As shown, in step S14: after the strength of the second temporary support wall 4 has stabilized, the first temporary support wall 3 and the second temporary support wall 4 are used as the supporting foundation of the existing structure, and the soil at the bottom of the existing structure is excavated.

[0092] In this embodiment, the strength of the second temporary support wall 4 can be tested using strength methods such as the rebound method or the ultrasonic method. Of course, the specific method for testing the strength of the second temporary support wall 4 can also be other methods, and is not limited to the above description. Those skilled in the art may make other changes based on the technical essence of this application, but as long as the function and effect achieved are the same as or similar to those of this application, they should all be covered within the scope of protection of this application.

[0093] When the strength of the second temporary support wall 4 is determined to be greater than the preset strength using a strength testing method, it indicates that the strength of the second temporary support wall 4 is stable.

[0094] After the strength of the second temporary support wall 4 has stabilized, the first temporary support wall 3 and the second temporary support wall 4 are used as the supporting foundation for the existing structure, and the soil at the bottom of the existing structure is excavated.

[0095] Step S15: After the soil excavation at the bottom of the existing structure is completed, the main structure of the trench is constructed.

[0096] In this embodiment, after the soil excavation at the bottom of the existing structure is completed, the main body of the trench can be constructed. Specifically, the construction of the main body of the trench may include the following steps:

[0097] Step S151: Pour the bottom slab 61 and side walls 62 of the newly built trench 2;

[0098] Step S152: After the bottom plate 61 and the side wall 62 are structurally stable, the top plate 7 is assembled using prefabricated cover plates;

[0099] Step S153: After the top plate 7 is assembled, cement grout is injected at the top plate 7 to complete the project.

[0100] The newly constructed trench 2 may include a bottom slab 61, side walls 62, and a top slab 7. For example... Figure 9 and Figure 10 As shown, the base plate 61 and the side wall 62 can be integrally formed by casting.

[0101] like Figure 11 and Figure 12 As shown, the top slab 7 can be assembled using a prefabricated cover plate and the upper opening of the side wall 62. For example... Figure 13 and Figure 14As shown, after the top plate 7 is assembled, cement grout can be injected between the top plate 7 and the lower surface of the existing trench 1 to improve the strength of the entire structure.

[0102] Specifically, the cement grouting at the top slab 7 involves using a 0.5:1 cement grout to form a sealing connection layer 8 between the surface of the top slab 7 and the lower surface of the existing trench 1. After the sealing connection layer 8 is formed between the top slab 7 and the lower surface of the existing trench 1 using the 0.5:1 cement grout, the structural strength of the entire newly constructed trench 2 can be guaranteed.

[0103] When the project requires an open-cut method to sink and cross the existing ditch 1, temporary support walls can be partially excavated at suitable locations on both sides of the bottom of the existing ditch 1, and concrete foundations can be poured to support the existing structures. Two temporary support walls are excavated and poured sequentially (the next temporary support wall is excavated and poured only after the strength of the first one meets the design requirements). Once the strength grades of both temporary support walls meet the design requirements, the bottom soil of the existing ditch 1 is excavated, the concrete is poured, and the open-cut crossing is carried out. Overall, this open-cut method for sinking and crossing existing ditches is convenient for design and construction, and the construction period and cost are easy to control. It is suitable for situations with limited space, time and cost constraints, and high operation and maintenance requirements.

[0104] Based on the above-described method for excavating and traversing an existing trench, this application also provides an excavation and traversing structure for excavating and traversing an existing trench. The existing trench 1 extends along a first direction X, and a new trench 2 extends along a second direction Y at a predetermined angle to the existing trench 1. After the new trench 2 and the existing trench 1 are projected onto a first plane, the intersection of the center lines of the projections of the new trench 2 and the existing trench 1 is the first intersection point. The first plane is a horizontal plane or a plane parallel to the horizontal plane. A positioning line is formed at a position perpendicular to the second direction Y and passing through the first intersection point.

[0105] The open-cut structure for sinking through the existing trench includes: a first temporary support wall 3, located on the side of the existing trench 1, adjacent to the existing trench 1 (where "adjacent" means that the first temporary support wall 3 and the existing trench 1 have overlapping contact surfaces, for example, one side of the first temporary support wall 3 coincides with the side of the existing trench 1), and along the second direction Y, one side of the first temporary support wall 3 is flush with the positioning line, and the other side, in its projection toward the first plane, at least covers the existing trench 1; a second temporary support wall 4, located on the other side of the newly constructed trench 2 along the positioning line direction; the second temporary support wall 4 is located on the side of the existing trench 1, adjacent to the existing trench 1, and along the second direction Y, one side of the second temporary support wall 4 is flush with the positioning line, and the other side, in its projection toward the first plane, at least covers the existing trench 1; and a trench body, the trench body being located on the opposing sides of the first temporary support wall 3 and the second temporary support wall 4.

[0106] The main body of the trench includes: a base plate 61, side walls 62 disposed on the base plate 61, and a top plate 7 disposed on the side of the side walls 62 facing away from the base plate 61. A sealing connection layer 8 is disposed between the top plate 7 and the lower surface of the existing trench 1. The base plate 61 and the side walls 62 are integrally formed by cast-in-place casting to constitute... Figure 9 and Figure 10 The cast-in-place portion 6 is shown. The top slab 7 is a precast cover plate. The sealing connection layer 8 is formed by grouting with 0.5:1 cement grout.

[0107] The open-cut structure for sinking through the existing ditch is obtained by implementing the above-described open-cut method for sinking through the existing ditch. It can achieve the technical effects achieved by the implementation method of the open-cut method for sinking through the existing ditch. For details, please refer to the specific description of the above implementation method. This application will not repeat it here.

[0108] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0109] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0110] The above are merely a few embodiments of the present invention. Although the embodiments disclosed in the present invention are as described above, the content is only for the purpose of facilitating understanding of the present invention and is not intended to limit the present invention. Any person skilled in the art to which this invention pertains may make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed in the present invention. However, the patent protection scope of the present invention shall still be determined by the scope defined in the appended claims.

Claims

1. A cut-and-cover structure for sunken crossing of an existing trench, characterized in that, The existing ditch extends along a first direction, and a new ditch extends along a second direction at a predetermined angle to the existing ditch. After the new ditch and the existing ditch are projected onto a first plane, the intersection of the center lines of the projections of the new ditch and the existing ditch is the first intersection point. The first plane is a horizontal plane or a plane parallel to the horizontal plane. A positioning line is formed at a position perpendicular to the second direction and passing through the first intersection point. The open-cut structure that allows for the submersion of the existing trench includes: The first temporary support wall is located on the side of the existing trench, adjacent to the existing trench. Along the second direction, one side of the first temporary support wall is flush with the positioning line, and the other side, in its projection toward the first plane, at least covers the existing trench. The second temporary support wall is located on the other side of the newly constructed trench along the positioning line; the second temporary support wall is located on the side of the existing trench, adjacent to the existing trench, and along the second direction, one side of the second temporary support wall is flush with the positioning line, and the other side, in its projection toward the first plane, at least covers the existing trench. The main body of the trench is located between the first temporary support wall and the second temporary support wall.

2. The open-cut structure for sinking through an existing trench as described in claim 1, characterized in that, The main body of the trench includes: a base plate, a side wall disposed on the base plate, a top plate disposed on the side of the side wall away from the base plate, and a sealing connection layer is provided between the top plate and the lower surface of the existing trench.

3. The open-cut structure for sinking through an existing trench as described in claim 2, characterized in that, The base plate and the side wall are integrally formed by cast-in-place.

4. The open-cut structure for sinking through an existing trench as described in claim 2, characterized in that, The top plate is a prefabricated cover plate.

5. The open-cut structure for sinking through an existing trench as described in claim 2, characterized in that, The sealing connection layer is formed by grouting with 0.5:1 cement grout.

6. The open-cut structure for sinking through an existing trench as described in claim 4, characterized in that, The prefabricated cover plate covers the existing trench along the second direction.

7. A method for excavating and lowering through an existing trench, characterized in that, The open-cut method for sinking through existing trenches is used to form the open-cut structure for sinking through existing trenches as described in any one of claims 1 to 6.

8. The open-cut method for traversing an existing trench as described in claim 7, characterized in that, The open-cut method includes: Determine the implementation route of the new trench, and based on the excavation range of the new trench, determine the first preset position of the first temporary support wall and the second preset position of the second temporary support wall; The soil is vertically excavated at the first preset position and fully excavated to the bottom of the existing structure to form the first temporary support wall; After the strength of the first temporary support wall stabilizes, the soil at the second preset position is vertically excavated and the excavation area is filled to the bottom of the existing structure to form the second temporary support wall. After the strength of the second temporary support wall stabilizes, the first and second temporary support walls are used as the supporting foundation for the existing structure, and the soil at the bottom of the existing structure is excavated. After the soil at the bottom of the existing structures is excavated, the main structure of the trench will be constructed.

9. The open-cut method for traversing an existing trench as described in claim 8, characterized in that, The main structure of the trench includes: Pour the bottom slab and side walls of the newly built trench; After the base plate and the side wall structure are stabilized, the top plate is assembled using prefabricated cover plates; After the top plate is assembled, cement grout is injected between the top plate and the lower surface of the existing trench to complete the project.

10. The open-cut method for traversing an existing trench as described in claim 9, characterized in that, The cement grouting at the top plate specifically involves grouting with 0.5:1 cement grout, forming a sealing connection layer between the surface of the top plate and the lower surface of the existing trench.

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