A composite structure frame body of a tunnel portal ventilation duct

Abstract

The utility model belongs to the field of tunnel ventilation pipeline's support, concretely relates to a kind of composite structure frame body of tunnel portal ventilation pipeline;Including pipeline support frame and the first portal frame and second portal frame of interval arrangement along tunnel direction into cave;Second portal frame is located at tunnel portal, one end of pipeline support frame is connected in the door hole of second portal frame, other end is placed on the top of first portal frame;It is structured with the accommodating groove along length direction on pipeline support frame, and ventilation pipeline extending from inside tunnel is laid in the accommodating groove of pipeline support frame;The utility model passes through the composite structure of pipeline support frame, first portal frame and second portal frame, solves the problem that the existing ventilation pipeline portal frame body is prone to structural deformation under complex geology and long-term load effect, and the stability problem of deficiency.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel ventilation duct support, specifically relating to a composite structure frame for a tunnel entrance ventilation duct. Background Technology

[0002] Ventilation ducts are the channels through which air flows in a ventilation system. They bring fresh air into the tunnel from outside and expel stale air from inside. They play a crucial role in maintaining a comfortable environment inside the tunnel, protecting the health of personnel, and ensuring the normal operation of various equipment. Ventilation ducts themselves have a certain weight, especially long-distance, large-diameter ducts used in large tunnels, whose weight exerts a significant vertical load on the support structure at the tunnel entrance. The support structure needs sufficient strength and rigidity to withstand the weight of the ventilation ducts without deformation or damage.

[0003] However, the existing framework has prominent problems: the structure is rudimentary, the steel is simply welded, the strength and stability are poor, and it is easy to deform, shake or even collapse, affecting ventilation and safety; it is also difficult to adapt to pipes of different specifications and complex opening environments. Utility Model Content

[0004] This invention aims to solve the problem that existing ventilation duct opening frames are prone to structural deformation and insufficient stability under complex geological conditions and long-term loads.

[0005] This utility model provides the following technical solution: a composite structure frame for ventilation ducts at tunnel entrances, including a pipe support frame and a first gantry and a second gantry arranged at intervals along the tunnel entrance direction; the second gantry is located at the tunnel entrance, one end of the pipe support frame is connected to the doorway of the second gantry, and the other end is placed on top of the first gantry; the pipe support frame is constructed with a receiving groove along its length, and the ventilation duct extending from inside the tunnel is laid in the receiving groove of the pipe support frame.

[0006] Furthermore, the first gantry includes gantry units arranged at intervals, which are connected by support crossbars; each gantry unit includes columns and beams, with the beams fixedly connected to the tops of the columns, and the bottoms of the columns on one side fixedly connected to the same ground beam.

[0007] Furthermore, the ground beam includes a steel shell, which is fixed to the bottom foundation by anchor bolts, and the column is inserted into the steel shell and fixed by pouring concrete.

[0008] Furthermore, an arched frame is provided inside the gantry unit, with the middle of the arched frame tangent to and fixedly connected to the crossbeam, and the ends of the arched frame fixedly connected to the column.

[0009] Furthermore, reinforcing uprights are installed between the arched frame and the crossbeams.

[0010] Furthermore, the pipe support frame includes three trusses that form an upward-opening receiving groove, and connecting rods between the left and right trusses restrict the movement of the ventilation ducts within the receiving groove.

[0011] Furthermore, the second gantry includes the structure of the first gantry and a supporting crossbeam, which is connected between the columns, and the pipe support frame is attached to the supporting crossbeam.

[0012] Furthermore, laser displacement sensors are installed on the first and second gantry.

[0013] Compared with the prior art, the advantages of this utility model are: This utility model provides a composite structure frame for ventilation ducts at tunnel entrances. The duct support frame consists of three trusses forming a receiving groove, which can effectively disperse the vertical and horizontal loads transmitted by the ventilation duct and reduce local stress concentration. The portal frames at both ends of the duct support frame adopt a composite structure with an arched skeleton. The arched skeleton, with its good compressive strength, further enhances the load-bearing capacity of the portal frame for the upper load. The load of the portal frame is transferred through the columns to the ground beam composed of concrete and steel shells and then to the ground. This effectively solves the problem that existing frames are prone to structural deformation and insufficient stability under complex geological conditions and long-term loads, providing a stable and reliable support for the ventilation duct. Attached Figure Description

[0014] Figure 1 A schematic diagram of the composite structure frame for the ventilation duct at the tunnel entrance; Figure 2 This is a schematic diagram of the first gantry; Figure 3 This is a schematic diagram of the second gantry; Figure 4 This is a schematic diagram of a pipe support frame.

[0015] In the diagram: 1-Pipe support frame; 1.1-Truss; 1.2-Stop bar; 2-First gantry; 2.1-Support crossbar; 2.2-Column; 2.3-Beam; 2.4-Arch frame; 2.5-Reinforcing upright; 3-Second gantry; 3.1-Support crossarm; 4-Ventilation duct; 5-Ground beam; 5.1-Steel shell; 5.2-Anchor bolt; 5.3-Pouring concrete; 6-Laser displacement sensor; 7-Tunnel outline. Detailed Implementation

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] like Figure 1 As shown: A composite structure frame for a ventilation duct at a tunnel entrance includes a duct support frame 1 and a first gantry 2 and a second gantry 3 arranged at intervals along the tunnel entrance direction; the second gantry 3 is located at the tunnel entrance, one end of the duct support frame 1 is connected to the doorway of the second gantry 3, and the other end is placed on top of the first gantry 2; the duct support frame 1 is constructed with a receiving groove along its length, and the ventilation duct 4 extending from inside the tunnel is laid in the receiving groove of the duct support frame 1.

[0018] like Figure 2 As shown: The first gantry 2 includes gantry units arranged at intervals, which are connected by support crossbars 2.1; the load is distributed by multiple gantry units, which are connected and mutually support each other by support crossbars 2.1; the gantry unit includes columns 2.2 and beams 2.3, the beams 2.3 are fixedly connected to the top of the columns 2.2, and the bottom of the columns 2.2 on one side is fixedly connected to the same ground beam 5.

[0019] The ground beam 5 comprises a steel shell 5.1, which is fixed to the foundation by anchor bolts 5.2. The uprights 2.2 are inserted into the steel shell 5.1 and secured by poured concrete 5.3. The ground beam 5, with its internal concrete structure, ensures the stability of the uprights 2.2, providing strong vertical support for the gantry and effectively preventing settlement under long-term loads, thus guaranteeing the stability and safety of the entire opening frame structure. The steel shell 5.1 of the ground beam 5 is fixed to the ground by anchor bolts 5.2, facilitating removal after ventilation, which aligns with the concept of green and environmentally friendly development.

[0020] An arched frame 2.4 is installed within the gantry unit. The midpoint of the arched frame 2.4 is tangent to and fixedly connected to the crossbeam 2.3, and the ends of the arch are fixedly connected to the uprights 2.2. The good compressive strength of the arched frame 2.4 enhances the load-bearing capacity of the frame structure for the upper load. A reinforcing upright 2.5 is installed between the arched frame 2.4 and the crossbeam 2.3. The load is transferred through the reinforcing upright 2.5, which improves the vertical compressive strength and the lateral tensile strength.

[0021] like Figure 3 As shown: The second gantry 3 includes the structure of the first gantry 2 and a supporting crossbeam 3.1. The supporting crossbeam 3.1 is connected between the columns 2.2, and the pipe support frame 1 is attached to the supporting crossbeam 3.1.

[0022] like Figure 4As shown: The pipe support frame 1 includes three trusses 1.1, which form an upward-opening receiving groove to effectively disperse the vertical and horizontal loads transmitted by the ventilation duct 4 and reduce local stress concentration. The connecting rods 1.2 between the left and right trusses 1.1 restrict the vibration of the ventilation duct 4 in the receiving groove, and the rods 1.2 enhance the torsional strength of the pipe support frame 1.

[0023] The pipe support frame 1 is fixed to the first gantry 2 and the second gantry 3 by bolts, and shock-absorbing rubber pads are placed at the connection points to effectively buffer the vibration generated during the operation of the ventilation duct 4 and reduce fatigue damage to the frame.

[0024] All metal components of the first gantry 2, the second gantry 3, and the pipe support frame 1 are hot-dip galvanized and coated with anti-corrosion paint to form a double anti-corrosion protective layer, improving durability in humid and corrosive tunnel environments.

[0025] Laser displacement sensors 6 are installed on the first gantry 2 and the second gantry 3. Before installation, the laser displacement sensors 6 are calibrated and fixed to the gantry using a dedicated mounting bracket. Their angle and position are adjusted to ensure the laser beam accurately illuminates the measured area. The installation is secure and reliable to prevent loosening or displacement of the ventilation duct 4 during operation. The laser displacement sensors 6 monitor the deformation and local displacement of the first gantry 2 and the second gantry 3.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite structural frame for a tunnel entrance ventilation duct, characterized in that: It includes a pipe support frame (1) and a first gantry (2) and a second gantry (3) arranged at intervals along the tunnel entrance direction; the second gantry (3) is located at the tunnel entrance, one end of the pipe support frame (1) is connected to the doorway of the second gantry (3), and the other end is placed on the top of the first gantry (2); the pipe support frame (1) is constructed with a receiving groove along the length direction, and the ventilation pipe (4) extending from the tunnel is laid in the receiving groove of the pipe support frame (1).

2. The composite structure frame for a tunnel entrance ventilation duct according to claim 1, characterized in that: The first gantry (2) includes gantry units arranged at intervals, which are connected by a support crossbar (2.1); the gantry unit includes a column (2.2) and a crossbeam (2.3), the crossbeam (2.3) is fixedly connected to the top of the column (2.2), and the bottom of the column (2.2) on one side is fixedly connected to the same ground beam (5).

3. The composite structure frame for a tunnel entrance ventilation duct according to claim 2, characterized in that: The ground beam (5) includes a steel shell (5.1), which is fixed to the bottom foundation by anchor bolts (5.2). The column (2.2) is inserted into the steel shell (5.1) and fixed by pouring concrete (5.3).

4. The composite structure frame for a tunnel entrance ventilation duct according to claim 3, characterized in that: The gantry unit is provided with an arched frame (2.4), the middle of the arched frame (2.4) is tangent to the crossbeam (2.3) and fixedly connected, and the end of the arch is fixedly connected to the column (2.2).

5. The composite structure frame for a tunnel entrance ventilation duct according to claim 4, characterized in that: A reinforcing upright (2.5) is provided between the arched frame (2.4) and the crossbeam (2.3).

6. The composite structure frame for a tunnel entrance ventilation duct according to claim 1, characterized in that: The pipe support frame (1) includes three trusses (1.1), which form an upward-opening receiving groove. The left and right trusses (1.1) are connected by a stop bar (1.2) to restrict the movement of the ventilation pipe (4) in the receiving groove.

7. The composite structure frame for a tunnel entrance ventilation duct according to claim 4, characterized in that: The second gantry (3) includes the structure of the first gantry (2) and a support crossbeam (3.1). The support crossbeam (3.1) is connected between the columns (2.2), and the pipe support frame (1) is attached to the support crossbeam (3.1).

8. The composite structure frame for a tunnel entrance ventilation duct according to claim 7, characterized in that: Laser displacement sensors (6) are installed on the first gantry (2) and the second gantry (3).

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