Chain type back plate applied to freeze method communication passage

Abstract

The utility model relates to underground engineering safety construction technical field, the utility model provides a chain type backboard for the application in the frozen method liaison passage, along the excavation surface of the frozen method liaison passage is arranged, including the strip backboard of the close contact frozen method liaison passage excavation surface of many pieces, the strip backboard of many pieces is connected as a whole, and the overall shape is matched with the frozen method liaison passage section, is fixedly connected through the stay arranged in the length direction both sides of backboard between adjacent backboards, and is provided with steel nail in the middle of the vertical region of chain type backboard corresponding frozen method liaison passage both sides, the steel nail fixedly inserts between the adjacent two backboards, and passes through the backboard and inserts the excavation surface in the frozen method liaison passage. The backboard of the utility model can closely adhere to the excavation surface soil according to the soil shape, makes the compactness of contact surface improve, reduces the cold loss, guarantees the long-term stability of freezing curtain.

Description

Technical Field

[0001] This utility model relates to the field of underground engineering safety construction technology, and in particular to a chain backplate applied to a refrigeration method connecting passage. Background Technology

[0002] The Artificial Ground Freezing (AGF) method for constructing tunnel connecting passages is a construction method used in soft soil strata, particularly suitable for subway and municipal tunnel projects. Its core principle is to freeze water in the strata into ice using artificial freezing technology, forming a high-strength, impermeable frozen soil curtain to provide temporary support and ensure the safety of excavation and structural construction. In the process of constructing connecting passages using the Artificial Ground Freezing (AGF) method, "over-excavation" is a common and highly challenging technical problem. Over-excavation refers to the actual volume or area of ​​excavated soil exceeding the safe range defined by the designed frozen wall contour. This phenomenon is not only difficult to completely avoid, but also, due to the significant engineering risks it brings, becomes a key factor restricting construction safety, quality, and efficiency.

[0003] In the construction of conventional freezing-supported connecting tunnels, wooden backing boards, due to insufficient structural rigidity and adaptability to curved surfaces, cannot effectively conform to the excavation face, resulting in large gaps between the backing board and the soil, exacerbating cold loss and the risk of frost heave. If the wooden backing boards are installed after the initial support steel is installed, this requires over-excavation on both sides of the connecting tunnel, the arch, and forward to ensure effective installation of the backing boards; however, this over-excavation causes significant damage to the freezing curtain, and severe over-excavation can even affect the stability of the freezing curtain. Furthermore, the density of the wooden backing boards installed in this way is not particularly high. Therefore, a chain-type backing board is proposed for use in freezing-supported connecting tunnels. Utility Model Content

[0004] In view of this, the present invention provides a chain backplate for use in refrigeration method communication channels. The backplate can fit closely to the excavation contour, thereby reducing cold loss and the risk of frost heave, and can effectively prevent over-excavation on both sides and forward.

[0005] To achieve the above objectives, this utility model provides a chain-type backplate for a cryogenic connection channel. Arranged along the excavation surface of the cryogenic connection channel, it includes multiple strip-shaped backplates tightly attached to the excavation surface, with the multiple strip-shaped backplates connected as a single unit. The overall shape matches the cross-section of the cryogenic connection channel. Adjacent backplates are fixedly connected by tie rods on both sides along the length of the backplate. Steel nails are driven into the middle of the vertical areas on both sides of the chain-type backplate corresponding to the cryogenic connection channel. These steel nails are fixedly inserted between adjacent backplates and pass through the backplates into the excavation surface of the cryogenic connection channel. Each tie rod includes connecting bolts and steel bars located on the sides of the connection points between adjacent strip-shaped backplates. Two through holes are correspondingly formed on each steel bar, and the steel bar is connected to the two adjacent strip-shaped backplates respectively by two connecting bolts.

[0006] The preferred technical solution of this utility model is as follows: the pull bar is fixed on one side of the back plate near the cross section of the freezing method connecting channel; each back plate has screw grooves on both sides along its length.

[0007] The preferred technical solution of this utility model is as follows: the steel nail includes a nail body fixedly connected inside the back plate, a top cap fixedly connected to the outer end of the nail body, a washer placed between the top cap and the back plate, a fixed shaft fixedly connected to the inner side of the nail body, a rotating plate movably connected to the outer side of the fixed shaft, and a spring fixedly connected between the rotating plate and the nail body.

[0008] The preferred technical solution of this utility model is that the through hole has a capsule-shaped structure.

[0009] The preferred technical solution of this utility model is as follows: 2 to 4 steel nails are set in the middle of the vertical area on each side of the chain back plate corresponding to the freezing method communication channel, and the steel nails are specifically arranged at the arched position; the length of each nail is greater than the thickness of the back plate.

[0010] Compared with existing technologies, this invention, by incorporating tie rods, facilitates a tight fit between the backplate and the excavated soil. By moving the backplate installation stage forward to before the initial support steel construction, it allows for direct contact with the undisturbed soil, eliminating lateral and forward over-excavation. During installation, bolts are fixed at the center of the through-hole, facilitating subsequent adjustment of the angle between adjacent backplates. This ensures a tight fit between the backplate and the excavated soil, increasing the density of the contact surface, reducing cold loss, and guaranteeing the long-term stability of the frozen curtain. This invention, with its inherent stability, provides excellent soil contact and allows for free adjustment of the curvature according to the arc. The backplate can be installed before the initial support steel installation, effectively preventing over-excavation on both sides and forward. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2This is a schematic diagram of the overall structure of the back panel of this utility model;

[0013] Figure 3 This is a schematic diagram of the overall structure of the pull bar of this utility model;

[0014] Figure 4 This is a schematic diagram of the overall structure of the steel nail of this utility model.

[0015] Figure descriptions: 1. Back plate; 101. Threaded groove; 2. Tie bar; 201. Steel bar; 202. Connecting bolt; 203. Through hole; 3. Steel nail; 301. Top cap; 302. Nail body; 303. Washer; 304. Spring; 305. Rotating plate; 306. Fixed shaft. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. Figures 1 to 4 All accompanying drawings are simplified versions of embodiments and are intended solely for the purpose of clearly and concisely illustrating the embodiments of this utility model. The technical solutions shown in the drawings below are specific solutions of embodiments of this utility model and are not intended to limit the scope of the claimed utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0017] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] The embodiment provides a chain backplate for a cryogenic connection channel, which is laid out along the excavation face of the cryogenic connection channel, with reference to... Figure 1-4The system includes multiple strip-shaped back panels 1 that are closely attached to the excavation surface of the cryogenic connection channel. The back panels 1 are made of wood and are connected as a whole, with their overall shape matching the cross-section of the cryogenic connection channel. Adjacent back panels 1 are fixedly connected by tie rods 2 on both sides of the back panel along its length. Steel nails 3 are driven into the middle of the vertical areas on both sides of the chain-shaped back panels corresponding to the cryogenic connection channel. The steel nails 3 are fixedly inserted between two adjacent back panels 1 and pass through the back panels 1 into the excavation surface of the cryogenic connection channel. The tie rods 2 include connecting bolts 202 and steel bars 201 located on the side of the connection part of the two adjacent strip-shaped back panels 1. The steel bars 201 have two corresponding through holes 203 and are connected to the two adjacent strip-shaped back panels 1 by two connecting bolts 202 respectively. The tie rods 2 are fixed on the side of the back panel 1 near the cross-section of the cryogenic connection channel.

[0019] When using the backplate 1, cut it to the required specifications according to the needs, and design and mass-produce the required tie rods 2 according to the requirements. Then, the backplate 1 can be installed. The installation stage of the backplate 1 is moved forward to before the construction of the initial support steel, and it is directly attached to the original soil to eliminate lateral and forward over-excavation. When installing the backplate 1, the protective layer pads can be installed first. After the pads are installed, the bottom backplate 1 is laid first. The two backplates 1 can be fixed to a certain position by using the connecting bolts 202 through the through holes 203. The connecting bolts 202 are fixed in the center position of the through holes 203 to facilitate the subsequent adjustment of the angle between adjacent backplates 1. After the bottom backplate 1 is installed, the vertical The back panel 1 is installed in the vertical direction. The corner effect can be achieved by adjusting the position of the tie rod 2 between the vertical back panel 1 and the bottom back panel 1. After the vertical back panel 1 is installed, steel nails 3 are driven into the center positions of multiple vertical back panels 1 to prevent the middle back panel 1 from arching outward. Then, the back panel 1 at the top of the arch is installed. By rotating the adjacent back panels 1 to change the position of the steel strip 201 and the connecting bolt 202, the back panel 1 can be made to fit tightly against the excavated soil. After fitting, the bolt 202 is tightened to ensure the stability of the installation, improve the density of the contact surface, reduce cold loss, and ensure the long-term stability of the frozen curtain.

[0020] In the embodiments, such as Figure 1 and Figure 2 As shown, the back plate 1 includes a plate body, and both sides of the plate body are provided with screw grooves 102 for screwing in bolts 202. Two to four steel nails 3 are arranged in the middle of the vertical area on each side of the chain-type back plate corresponding to the refrigeration connection channel, specifically at the arched positions; as shown... Figure 4As shown, the steel nail 3 includes a nail body 302 fixedly connected inside the back plate 1. A top cap 301 is fixedly connected to the outer end of the nail body 302. A washer 303 is placed between the top cap 301 and the back plate 1. When the nail body 302 penetrates the back plate 1 and is driven into the soil, causing the top cap 301 to press tightly against the washer 303, it can reinforce the middle back plate 1 in the vertical direction, preventing the middle back plate 1 from arching outward due to pressure from the upper back plate 1. A fixing shaft 306 is fixedly connected to the inner side of the nail body 302, and the outer side of the fixing shaft 306 is movable. A rotating plate 305 is connected to the rotating plate 305, which can rotate outside the fixed shaft 306. A spring 304 is fixedly connected between the rotating plate 305 and the nail body 302. When the nail body 302 is driven into the soil, the rotating plate 305 can rotate outward and fit tightly against the soil under the action of the spring 304. When the nail body 302 is pulled outward, the end of the rotating plate 305 away from the fixed shaft 306 can be tightly inserted into the soil, making it difficult to remove the nail body 302. This ensures higher stability after the steel nail 3 is fixed, and facilitates stable fixing of the back plate 1.

[0021] In this embodiment, the through hole 203 has a capsule-shaped structure, allowing the bolt 202 to be adjusted relative to the steel strip 201 at a certain position, facilitating the adjustment of the angle between the back plates 1. The nail body 302 is located at the center of multiple vertical back plates 1, used to reinforce the middle back plate 1 in the vertical direction. The length of the nail body 302 is greater than the thickness of the back plate 1, allowing the nail body 302 to penetrate the back plate 1 and be driven into the soil.

[0022] Working principle: When in use, the required specifications of the backplate 1 are cut according to the requirements, and the required tie rods 2 are designed and mass-produced. Then, the backplate 1 can be installed. The installation stage of the backplate 1 is moved forward to before the initial support steel construction, directly adhering to the original soil to eliminate lateral and forward over-excavation. When installing the backplate 1, protective layer pads can be installed first. After the pads are installed, the bottom backplate 1 is laid first. The two backplates 1 can be fixed to a certain position using connecting bolts 202 through through holes 203. The connecting bolts 202 are fixed at the center position of the through holes 203, facilitating subsequent adjustment of the angle between adjacent backplates 1. After the bottom backplate 1 is installed, the vertical... The vertical backplate 1 is installed. The corner effect can be achieved by adjusting the position of the tie rod 2 between the vertical backplate 1 and the bottom backplate 1. After the vertical backplate 1 is installed, steel nails 3 are driven into the center of multiple vertical backplates 1 to prevent the middle backplate 1 from arching outward. Then the backplate 1 at the top of the arch is installed. By rotating the adjacent backplates 1 to change the position of the steel strip 201 and the connecting bolt 202, the backplate 1 can be made to fit tightly against the excavation face soil. After fitting, the connecting bolt 202 is tightened to ensure the stability of the installation, improve the density of the contact surface, reduce cold loss, and ensure the long-term stability of the frozen curtain.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A chain backplate for a cryogenic connection channel, arranged along the excavation face of the cryogenic connection channel, characterized in that: The system includes multiple strip back plates (1) that are closely attached to the excavation surface of the cryogenic connection channel. The multiple strip back plates (1) are connected as one unit, and their overall shape matches the cross-section of the cryogenic connection channel. Adjacent back plates (1) are fixedly connected by tie bars (2) set on both sides of the back plate in the length direction. Steel nails (3) are driven into the middle of the vertical area on both sides of the chain back plate corresponding to the cryogenic connection channel. The steel nails (3) are fixedly inserted between two adjacent back plates (1) and pass through the back plate (1) and are inserted into the excavation surface of the cryogenic connection channel. The tie bar (2) includes connecting bolts (202) and steel bars (201) located on the side of the connection part of the two adjacent strip back plates (1). Two through holes (203) are opened on the steel bars (201). The steel bars (201) are connected to the two adjacent strip back plates (1) respectively by two connecting bolts (202).

2. The chain backplate for a cryogenic communication channel according to claim 1, characterized in that: The pull bar (2) is fixed on one side of the back plate (1) near the cross section of the freezing method connecting channel; each back plate (1) has screw grooves (101) on both sides in the length direction.

3. A chain backplate for a cryogenic communication channel according to claim 1 or 2, characterized in that: The steel nail (3) includes a nail body (302) fixedly connected inside the back plate (1), a top cap (301) fixedly connected to the outer end of the nail body (302), a washer (303) placed between the top cap (301) and the back plate (1), a fixing shaft (306) fixedly connected to the inner side of the nail body (302), a rotating plate (305) movably connected to the outer side of the fixing shaft (306), and a spring (304) fixedly connected between the rotating plate (305) and the nail body (302).

4. A chain backplate for a cryogenic communication channel according to claim 1 or 2, characterized in that: The through hole (203) has a capsule-shaped structure.

5. A chain backplate for a cryogenic communication channel according to claim 3, characterized in that: Two to four steel nails (3) are set in the middle of the vertical area on each side of the chain back plate corresponding to the freezing method communication channel. The steel nails (3) are specifically arranged at the arched position. The length of each nail body (302) is greater than the thickness of the back plate (1).

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