A design method and device for pre-embedded anchor plate of steel ring of lateral starting shield

Abstract

The present invention discloses a design method and device for a side-starting shield steel ring embedded anchor plate, the device includes embedded anchor plates, back connecting steel bars, structural steel bars, full welding points, plug hole welding points, and special-shaped steel rings, and the method includes building a model, generating a force cloud map, force condition analysis, and embedded anchor plate distribution design. The beneficial effects of the present invention are: the anchor plate is welded to the side wall structural steel bars by steel bar plug welding to form a structural whole, thereby improving the pull-out resistance of the anchor plate; through relevant calculations, it is found that when the special-shaped steel ring starts excavation, the force on the embedded anchor plate is different from that on conventional excavation, that is, the tension on the short side and the upper anchor plate is about twice the conventional tension. Based on this, when designing the anchor plate reinforcement steel bars, the top area and the short side area should be designed with denser layout of anchor steel bars to ensure the safety of engineering construction.

Description

Technical Field

[0001] The invention relates to a pre-embedded anchor plate design method, in particular to a side-starting shield steel ring pre-embedded anchor plate design method and device, belonging to the technical field of civil engineering. Background Art

[0002] With the continuous development of social economy, the utilization of underground space has received more and more attention, and more and more cities have relieved traffic pressure by building subways. Shield construction has been widely used in urban subway construction due to its advantages of safety, informatization, mechanization and less impact on ground traffic. However, in the geological environment of water-rich sand layer or complex surrounding environment, and the lack of end reinforcement conditions at the starting end, steel sleeves are needed to ensure that the tunnel door is sealed and leak-proof, and soil pressure can be established in the soil bin.

[0003] In order to meet the construction requirements, lateral launching is necessary. Conventional lateral launching technology mostly uses shield launching shafts to be excavated on both sides of the subway line, and then a horizontal channel is excavated perpendicular to the line, and the shield machine is transported and assembled through the horizontal channel for excavation. However, when the horizontal channel is at a certain angle to the line, the traditional circular steel sleeve cannot meet the launching requirements, so the shape of the steel sleeve needs to be adjusted. Accordingly, the embedded anchor plate of the steel ring needs to be designed accordingly according to the force of the steel ring to ensure that the shield machine can be launched smoothly under the action of the steel sleeve. Summary of the invention

[0004] The purpose of the present invention is to provide a design method and device for a side-starting shield steel ring embedded anchor plate in order to solve the problem.

[0005] The present invention achieves the above-mentioned purpose through the following technical scheme: a design device for pre-embedded anchor plate of a side-starting shield steel ring, comprising

[0006] Embedded anchor plates are embedded in the secondary lining structure of the translational transverse channel;

[0007] Connecting steel bars connected to the embedded anchor plate, which are composed of back connecting steel bars connected to the back side of the embedded anchor plate and structural steel bars embedded in the secondary lining structure of the translational transverse channel;

[0008] Welding points are used to weld and fix the connection points, and include full welding points for welding and fixing between the back connecting steel bars and the structural steel bars and between the embedded anchor plate and the special-shaped steel ring, and plug welding points for welding and fixing the ends of the back connecting steel bars at the holes opened in the embedded anchor plate.

[0009] As a further solution of the present invention: full welding points are provided at the connection between the back side of the embedded anchor plate and the back connecting steel bar, so that the embedded anchor plate is connected to the back connecting steel bar by both full welding and plug welding.

[0010] As a further solution of the present invention: the back connecting steel bars are distributed and inserted into the holes opened at the upper and lower ends of the embedded anchor plates.

[0011] As a further solution of the present invention: the embedded anchor plate is first connected to the back connecting steel bar by plug welding, and then the back connecting steel bar is connected to the structural steel bar in the secondary lining structure by full welding.

[0012] As a further solution of the present invention: a plurality of pre-embedded anchor plates are arranged in a ring shape, and the pre-embedded anchor plates are distributed according to the stress conditions, and the pre-embedded anchor plates are densely arranged in areas with large stress.

[0013] A design method for a side-starting shield steel ring embedded anchor plate design device, the design method comprises the following steps

[0014] Step 1: Build the model and use Solidworks software to build the structural model of the special-shaped steel ring;

[0015] Step 2: Generate a force cloud diagram and use Solidworks software to mark the force cloud diagram of the constructed model;

[0016] Step 3: Analyze the stress conditions, analyze the stress conditions in the X-axis direction, Y-axis direction and Z-axis direction of the special-shaped steel ring, and divide the stress magnitude of each area of ​​the special-shaped steel ring;

[0017] Step 4: Design the distribution of embedded anchor plates. According to the divided stress areas, the embedded anchor plates are designed to be arranged in a denser manner.

[0018] The beneficial effects of the present invention are:

[0019] 1. The anchor plate is welded to the side wall structural steel bars through steel bar plug welding to form a structural whole, thereby improving the pull-out resistance of the anchor plate;

[0020] 2. Through relevant calculations, it is found that when the special-shaped steel ring begins to excavate, the force on the embedded anchor plate is different from that on conventional excavation, that is, the tension on the short side and the upper anchor plate is about twice the conventional tension. Based on this, when designing the anchor plate reinforcement steel bars, the anchor steel bars in the top area and the short side area should be densely arranged to ensure the safety of the project construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0022] Figure 2 It is a schematic diagram of the process of the present invention.

[0023] In the figure: 1. Embedded anchor plate, 2. Back connecting steel bars, 3. Structural steel bars, 4. Full welding points, 5. Plug hole welding points and 6. Special-shaped steel rings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment 1

[0026] See also Figure 1 , a design device for pre-embedded anchor plate of a side-starting shield steel ring, comprising

[0027] Embedded anchor plate 1, which is embedded in the secondary lining structure of the translational transverse channel;

[0028] Connecting steel bars, which are connected to the embedded anchor plate 1, and are composed of back connecting steel bars 2 connected to the back side of the embedded anchor plate 1 and structural steel bars 3 embedded in the secondary lining structure of the translational transverse channel;

[0029] The welding points are used to weld and fix the connection points, and include full welding points 4 for welding and fixing between the back connecting steel bars 2 and the structural steel bars 3 and between the embedded anchor plate 1 and the special-shaped steel ring 6, and plug welding points 5 for welding and fixing the ends of the back connecting steel bars 2 at the holes opened in the embedded anchor plate 1.

[0030] In the embodiment of the present invention, a full welding point 4 is provided at the connection between the back side of the embedded anchor plate 1 and the back connecting steel bar 2, so that the embedded anchor plate 1 is connected to the back connecting steel bar 2 by both full welding and plug hole welding to form a structural whole, thereby improving the pull-out resistance of the anchor plate.

[0031] In the embodiment of the present invention, the back connecting steel bars 2 are distributed and inserted into the holes opened at the upper and lower ends of the embedded anchor plate 1, and the side positions of the embedded anchor plate 1 are welded to ensure the dispersion of the stress points.

[0032] In the embodiment of the present invention, the embedded anchor plate 1 is first connected to the back connecting steel bar 2 by plug welding, and then the back connecting steel bar 2 is connected to the structural steel bar 3 in the secondary lining structure by full welding.

[0033] In the embodiment of the present invention, a plurality of pre-embedded anchor plates 1 are provided in a ring shape, and the pre-embedded anchor plates 1 are distributed according to the stress conditions, and the pre-embedded anchor plates 1 are densely arranged in areas with large stress.

[0034] Embodiment 2

[0035] See also Figure 2 A design method for a side-starting shield steel ring embedded anchor plate design device, the design method comprises the following steps

[0036] Step 1: construct a model, using Solidworks software to construct a structural model of the special-shaped steel ring 6;

[0037] Step 2: Generate a force cloud diagram and use Solidworks software to mark the force cloud diagram of the constructed model;

[0038] Step 3: Analyze the stress conditions, respectively analyze the stress conditions of the special-shaped steel ring 6 in the X-axis direction, the Y-axis direction, and the Z-axis direction, and divide the stress magnitude of each area of ​​the special-shaped steel ring 6;

[0039] Step 4: Design the distribution of the embedded anchor plates. According to the divided stress areas, the embedded anchor plates 1 are designed to be densely arranged.

[0040] Working principle: The embedded anchor plate 1 is connected to the back connecting steel bar 2 by plug welding, and then is welded to the cross channel side wall structural steel bar 3 to form a whole, which improves the pull-out resistance of the anchor plate. Through calculation results, it can be obtained that for shield construction starting from the heterogeneous steel ring 6, the stress imbalance phenomenon should be considered when designing the embedded anchor plate 1, and the anchor steel bars at the top, i.e. the short side, should be encrypted to improve the local tensile strength and ensure that the anchor plate will not be pulled out due to excessive force during construction.

[0041] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A design method for a side-starting shield steel ring embedded anchor plate design device, characterized in that: The side-starting shield steel ring embedded anchor plate design device comprises: Embedded anchor plates (1) are embedded in the secondary lining structure of the translational transverse channel; Connecting steel bars connected to the embedded anchor plate (1), which are composed of back connecting steel bars (2) connected to the back side of the embedded anchor plate (1) and structural steel bars (3) embedded in the secondary lining structure of the translational transverse channel; Welding points, which are used to weld and fix the connection points, and include full welding points (4) for welding and fixing between the back connection steel bars (2) and the structural steel bars (3) and between the embedded anchor plate (1) and the special-shaped steel ring (6), and plugging welding points (5) for welding and fixing the end of the back connection steel bars (2) at the hole opened in the embedded anchor plate (1); A full welding point (4) is provided at the connection between the back of the embedded anchor plate (1) and the back connecting steel bar (2), so that the embedded anchor plate (1) is connected to the back connecting steel bar (2) by both full welding and plug hole welding; the back connecting steel bar (2) is distributed and inserted in the holes opened at the upper and lower ends of the embedded anchor plate (1); the embedded anchor plate (1) is first connected to the back connecting steel bar (2) by plug hole welding, and then the back connecting steel bar (2) is connected to the structural steel bar (3) in the secondary lining structure by full welding; a plurality of the embedded anchor plates (1) are provided in a ring shape, and the embedded anchor plates (1) are distributed and arranged according to the stress conditions, and the embedded anchor plates (1) are densely arranged in the area with large stress; The design method comprises the following steps: Step 1: construct a model, using Solidworks software to construct a structural model of the special-shaped steel ring (6); Step 2: Generate a force cloud diagram and use Solidworks software to mark the force cloud diagram of the constructed model; Step 3: Analyze the stress conditions, respectively analyze the stress conditions of the special-shaped steel ring (6) in the X-axis direction, the Y-axis direction and the Z-axis direction, and divide the stress magnitude of each area of ​​the special-shaped steel ring (6); Step 4: pre-buried anchor plate distribution design: based on the divided stress-bearing areas, the pre-buried anchor plates (1) are densely arranged and designed.

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