Preliminary support buckle arch and pilot tunnel node connecting structure adopting PBA construction method

Abstract

The utility model discloses a PBA construction method primary support buckle arch and pilot tunnel node connecting structure which comprises a connecting steel plate, an angle steel connecting piece, an anchor bar and an L-shaped steel bar, the connecting steel plate is welded to the position, connected with a buckle arch steel frame, of a pilot tunnel steel frame main bar, the angle steel connecting piece is welded to the end, connected with the pilot tunnel steel frame, of the buckle arch steel frame main bar, and the anchor bar is welded to the L-shaped steel bar. The connecting steel plate is fixedly connected with the angle steel connecting piece through a bolt, the anchor bar is welded on the connecting steel plate and extends into the pilot tunnel steel frame, one end of the L-shaped steel bar is welded with a main bar of the buckling arch steel frame, and the other end of the L-shaped steel bar is welded with the main bar of the pilot tunnel steel frame. The connecting steel plates and the angle steel connecting pieces are connected through the bolts, the buckle arch steel frame and the pilot tunnel steel frame can be rapidly connected and positioned and further connected and fixed through the L-shaped steel bars after being bolted, meanwhile, the anchor bars can provide certain node connecting force, the buckle arch steel frame and the pilot tunnel steel frame can be rapidly and accurately connected during construction, and the construction efficiency is improved. And the joint connection strength is high.

Description

Technical Field

[0001] This utility model relates to the field of underground engineering construction technology, specifically to a connection structure between the initial support arch and the pilot tunnel node in the PBA method. Background Technology

[0002] The PBA method, short for "Pile-Beam-Arch Method," is a construction method that organically combines traditional open-cut and tunneling techniques. Its basic principle is to form a support system of beams, columns, and arches underground using pilot tunnels and pile support technology, thereby bearing the loads during construction. Typically, pilot tunnels are excavated first, followed by the arch excavation. The initial support steel frame of the arch and the initial support reinforcement of the pilot tunnel are then connected; the connection strength of this joint is crucial.

[0003] To ensure the connection between the initial support arch steel frame and the guide tunnel steel frame, the common method is to extend the length of the arch steel frame with reinforcing bars to achieve the connection with the guide tunnel steel frame. However, after the reinforcing bars are extended, it is difficult to find an accurate welding position between them and the guide tunnel steel frame, resulting in inaccurate connections and low connection strength. Utility Model Content

[0004] The purpose of this utility model is to address the problems of inconvenient connection and low strength between the initial support arch steel frame and the guide tunnel steel frame in the PBA construction method, and to provide a node connection structure between the initial support arch and the guide tunnel in the PBA construction method. During construction, the arch steel frame and the guide tunnel steel frame can be connected quickly and accurately, and the node connection strength is high.

[0005] This utility model is achieved through the following technical solution:

[0006] This utility model provides a connection structure between the initial support arch and the guide tunnel node in the PBA method, including a connecting steel plate, angle steel connectors, anchor bars, and L-shaped steel bars. The connecting steel plate is welded to the main reinforcement of the guide tunnel steel frame at the position where it connects to the arch steel frame. The angle steel connectors are welded to the main reinforcement of the arch steel frame at one end, which connects to the guide tunnel steel frame. The connecting steel plate and the angle steel connectors are fixedly connected by bolts. The anchor bars are welded to the connecting steel plate and extend into the guide tunnel steel frame. One end of the L-shaped steel bar is welded to the main reinforcement of the arch steel frame, and the other end is welded to the main reinforcement of the guide tunnel steel frame.

[0007] As a preferred embodiment of this utility model, the length and width of the connecting steel plate are both greater than the spacing of the main reinforcing bars of the guide hole steel frame and the spacing of the main reinforcing bars of the arch-fastening steel frame.

[0008] As a preferred embodiment of this utility model, the connecting steel plate is welded to the two outer main reinforcing bars of the guide hole steel frame, and the two outer main reinforcing bars of the guide hole steel frame are distributed at intervals in the middle area of ​​the connecting steel plate.

[0009] As a preferred embodiment of this utility model, the connecting steel plate is provided with multiple bolt holes, which are distributed on the outside of the main reinforcement of the guide hole steel frame.

[0010] As a preferred embodiment of this utility model, there are two angle steel connectors arranged opposite to each other. One side of each angle steel connector is welded to the two main reinforcing bars of the arch steel frame, and multiple bolt holes are provided through the other side.

[0011] As a preferred embodiment of this utility model, the inner side of the angle steel connector is welded to the inner side of the main reinforcement of the arch steel frame.

[0012] As a preferred embodiment of this utility model, the angle steel connectors are distributed on the outside of the main reinforcing bars of the guide tunnel steel frame.

[0013] As a preferred embodiment of this utility model, the anchor bars are distributed on the inner side of the main reinforcement bars of the guide tunnel steel frame.

[0014] As a preferred embodiment of this utility model, the length of the anchor bar is the same as the width of the guide hole steel frame.

[0015] As a preferred embodiment of this utility model, there are four L-shaped steel bars with the same diameter as the main reinforcement bars of the arch steel frame.

[0016] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0017] The node connection structure in this utility model uses connecting steel plates, angle steel connectors, anchor bars, and L-shaped steel bars. The connecting steel plates and angle steel connectors are connected by bolts, which can quickly connect and position the arch steel frame and the guide hole steel frame. After the two are bolted together, they can be further connected and fixed by L-shaped steel bars. At the same time, the anchor bars can also provide a certain node connection force. During construction, this structure can quickly and accurately connect the arch steel frame and the guide hole steel frame, and the node connection strength is high. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0019] Figure 1 This is a schematic diagram of the connection structure between the initial support arch and the guide tunnel node in the PBA method of this utility model.

[0020] Figure 2 This utility model Figure 1 AA diagram in the image;

[0021] Figure 3 This utility model Figure 1 The diagram of BB in the image.

[0022] The attached diagram shows the markings and corresponding component names:

[0023] 1-Connecting steel plate, 2-Angle steel connector, 3-Anchor bar, 4-L-shaped steel bar, 5-Guide hole steel frame main reinforcement, 6-Arch steel frame main reinforcement, 7-Bolt, 8-Bolt hole. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0025] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0029] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0030] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0031] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element 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 the embodiments of this application.

[0032] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0033] Please refer to Figures 1 to 3 This application provides a PBA method initial support arch and guide tunnel node connection structure, including a connecting steel plate 1, an angle steel connector 2, an anchor bar 3, and an L-shaped steel bar 4. The connecting steel plate 1 is welded to the main reinforcement 5 of the guide tunnel steel frame at the position where it connects with the arch steel frame. The angle steel connector 2 is welded to the main reinforcement 6 of the arch steel frame at one end, which connects with the guide tunnel steel frame. The connecting steel plate 1 and the angle steel connector 2 are fixedly connected by bolts 7. The anchor bar 3 is welded to the connecting steel plate 1 and extends into the guide tunnel steel frame. One end of the L-shaped steel bar 4 is welded to the main reinforcement 6 of the arch steel frame, and the other end is welded to the main reinforcement 5 of the guide tunnel steel frame.

[0034] The node connection structure in this application uses a connecting steel plate 1, an angle steel connector 2, an anchor bar 3, and an L-shaped steel bar 4. The connecting steel plate 1 and the angle steel connector 2 are connected by bolts 7, which can quickly connect and position the arch steel frame and the guide hole steel frame. After the two are bolted together, they can be further connected and fixed by the L-shaped steel bar 4. At the same time, the anchor bar 3 can also provide a certain node connection force. During construction, this structure can quickly and accurately connect the arch steel frame and the guide hole steel frame, and the node connection strength is high.

[0035] According to some embodiments of this application, the length and width of the connecting steel plate 1 are both greater than the spacing of the main reinforcing bars 5 of the guide tunnel steel frame and the spacing of the main reinforcing bars 6 of the arch-mounted steel frame. The illustration of this embodiment shows four main reinforcing bars 5 of the guide tunnel steel frame and four main reinforcing bars 6 of the arch-mounted steel frame. The main reinforcing bars of both the guide tunnel steel frame and the arch-mounted steel frame are distributed in a rectangular pattern when viewed from the cross-section.

[0036] In this embodiment, the connecting steel plate 1 has a width of 350mm, a length of 440mm, and a thickness of 10mm; the diameter of the main reinforcement 5 of the guide tunnel steel frame is 22mm, and the diameter of the main reinforcement 6 of the arch-fastening steel frame is 25mm.

[0037] According to some embodiments of this application, the connecting steel plate 1 is welded to two outer main reinforcing bars of the guide tunnel steel frame, and the two outer main reinforcing bars of the guide tunnel steel frame are spaced apart in the middle area of ​​the connecting steel plate 1. The aforementioned two outer main reinforcing bars refer to the two main reinforcing bars near the connecting ends of the main reinforcing bars 6 of the arch-fastening steel frame.

[0038] It should be noted that the connecting steel plate 1 can be welded to the main reinforcement 5 of the guide tunnel steel frame inside the tunnel, so that the welding position of the connecting steel plate 1 can be adjusted according to the connection position with the main reinforcement 6 of the arch steel frame, so as to better align and connect with the angle steel connector 2 welded on the main reinforcement 6 of the arch steel frame.

[0039] According to some embodiments of this application, a plurality of bolt holes 8 are provided through the connecting steel plate 1, and the bolt holes 8 are distributed on the outer side of the main reinforcing bar 5 of the guide hole steel frame. In this embodiment, the connecting steel plate 1 has four bolt holes 8 with an inner diameter of 26mm, and the four bolt holes 8 are evenly distributed on the connecting steel plate 1.

[0040] According to some embodiments of this application, there are two angle steel connectors 2 arranged opposite to each other. One side of each angle steel connector 2 is welded to two main reinforcing bars 6 of the arch steel frame, and multiple bolt holes 8 are provided through the other side.

[0041] In this embodiment, each angle steel connector 2 has two bolt holes 8. The size, spacing and distribution of the bolt holes 8 are the same as those on the connecting steel plate 1. During construction, M25 bolts 7 and nuts can be used to connect and fix the angle steel connector 2 to the connecting steel plate 1.

[0042] In this embodiment, each angle steel connector 2 is 330mm long and 10mm thick. The angle steel connector 2 is an unequal angle steel, with one side being 160mm wide and welded to two main reinforcing bars 6 of the arch steel frame. The other side is 100mm wide and has two bolt holes 8.

[0043] According to some embodiments of this application, the inner side of the angle steel connector 2 is welded to the inner side of the main reinforcement 6 of the arch steel frame. The inner side of the angle steel connector 2 refers to the side of the wall at the inner right angle of the angle steel, which is welded and fixed to the inner side of the main reinforcement 6 of the arch steel frame (i.e., the side of the two main reinforcements 6 facing the main reinforcement 5 of the guide hole steel frame).

[0044] It should be noted that the aforementioned angle steel connector 2 and the main reinforcement 6 of the arch steel frame can be pre-welded outside the hole.

[0045] According to some embodiments of this application, the angle steel connectors 2 are distributed on the outside of the main reinforcing bars 5 of the guide tunnel steel frame. After construction connection, the outer corners of the aforementioned angle steel connectors 2 are located on the outside of the main reinforcing bars 5 of the guide tunnel steel frame.

[0046] According to some embodiments of this application, the anchor bars 3 are distributed inside the main reinforcing bars 5 of the guide tunnel steel frame. There are four anchor bars 3, each with a diameter of 22mm, which can be pre-welded to the connecting steel plate 1 outside the tunnel.

[0047] According to some embodiments of this application, the length of the anchor bar 3 is the same as the width of the guide tunnel steel frame. After the connecting steel plate 1 is welded to the two outer main bars of the guide tunnel steel frame, the anchor bar 3 extends into the guide tunnel steel frame, and the free end of the anchor bar 3 is positioned corresponding to the inner main bar of the guide tunnel steel frame.

[0048] According to some embodiments of this application, there are four L-shaped reinforcing bars 4, and their diameters are the same as those of the main reinforcing bars 6 of the arch steel frame. These four L-shaped reinforcing bars 4 have a diameter of 25mm and can be pre-welded to the main reinforcing bars 5 of the guide tunnel steel frame outside the tunnel.

[0049] Specifically, four L-shaped steel bars 4 are welded to the two inner main reinforcement bars of the guide tunnel steel frame, that is, two L-shaped steel bars 4 are welded to each of the two inner main reinforcement bars of the guide tunnel steel frame. During construction, after the two angle steel connectors 2 are connected to the connecting steel plate 1 by bolts 7, the four L-shaped steel bars 4 are welded to the four main reinforcement bars 6 of the arch steel frame respectively.

[0050] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A connection structure between the initial support arch and the pilot tunnel node in the PBA method, characterized in that, It includes a connecting steel plate, angle steel connectors, anchor bars, and L-shaped steel bars. The connecting steel plate is welded to the main reinforcement of the guide tunnel steel frame at the position where it connects to the arch steel frame. The angle steel connector is welded to the main reinforcement of the arch steel frame at one end where it connects to the guide tunnel steel frame. The connecting steel plate and the angle steel connector are fixedly connected by bolts. The anchor bars are welded to the connecting steel plate and extend into the guide tunnel steel frame. One end of the L-shaped steel bar is welded to the main reinforcement of the arch steel frame, and the other end is welded to the main reinforcement of the guide tunnel steel frame.

2. The connection structure between the initial support arch and the guide tunnel node in the PBA method according to claim 1, characterized in that, The length and width of the connecting steel plate are both greater than the spacing of the main reinforcement bars of the guide tunnel steel frame and the spacing of the main reinforcement bars of the arch-fastening steel frame.

3. The connection structure between the initial support arch and the guide tunnel node in the PBA method according to claim 2, characterized in that, The connecting steel plate is welded to the two outer main reinforcing bars of the guide tunnel steel frame, and the two outer main reinforcing bars of the guide tunnel steel frame are spaced apart in the middle area of ​​the connecting steel plate.

4. The connection structure between the initial support arch and the guide tunnel node in the PBA method according to claim 2, characterized in that, Multiple bolt holes are provided through the connecting steel plate, and the bolt holes are distributed on the outside of the main reinforcement of the guide hole steel frame.

5. The connection structure between the initial support arch and the guide tunnel node in the PBA method according to claim 1, characterized in that, There are two angle steel connectors arranged opposite each other. One side of each angle steel connector is welded to the two main reinforcing bars of the arch steel frame, and multiple bolt holes are provided through the other side.

6. The connection structure between the initial support arch and the guide tunnel node in the PBA method according to claim 5, characterized in that, The inner side of the angle steel connector is welded to the inner side of the main reinforcement of the arch steel frame.

7. The connection structure between the initial support arch and the guide tunnel node in the PBA method according to claim 5, characterized in that, The angle steel connectors are distributed on the outside of the main reinforcement bars of the guide tunnel steel frame.

8. The connection structure between the initial support arch and the guide tunnel node in the PBA method according to any one of claims 1-7, characterized in that, The anchor bars are distributed on the inner side of the main reinforcement bars of the guide tunnel steel frame.

9. The connection structure between the initial support arch and the guide tunnel node in the PBA method according to claim 8, characterized in that, The length of the anchor bar is the same as the width of the guide tunnel steel frame.

10. The connection structure between the initial support arch and the pilot tunnel node in the PBA method according to any one of claims 1-7, characterized in that, There are four L-shaped steel bars, and their diameters are the same as the main reinforcement bars of the arch steel frame.

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