A positioning clamp for a pre-embedded unit of a three-limb steel frame in a tunnel

Abstract

This utility model discloses a positioning fixture for a pre-embedded unit of a three-limb steel frame in a tunnel. The fixture is installed on the top surface of the invert arch formwork and includes a longitudinal adjustment base, a height adjustment arm, and a fixed connecting plate. The longitudinal adjustment base is located on the top surface of the invert arch formwork. The height adjustment arm includes a fixed rod and a movable rod. The lower part of the fixed rod is connected and fixed to the longitudinal adjustment base by bolts, allowing for longitudinal position adjustment within a certain range. The movable rod is connected and fixed to the fixed rod by bolts, allowing for vertical position adjustment within a certain range. A connecting rod is fixedly connected to one side of the movable rod, and a fixed connecting plate is installed at the other end of the connecting rod. The fixed connecting plate is connected and fixed to the top connecting plate of the pre-embedded unit of the three-limb steel frame by fasteners. This device is easy to install and disassemble, convenient for storage and transportation, simple and stable, suitable for positioning and installing pre-embedded units of three-limb steel frame sections in tunnels, and reusable.

Description

Technical Field

[0001] This utility model relates to the technical field of tunnel three-limb steel frame construction, and more specifically, to a positioning clamp for a tunnel three-limb steel frame pre-embedded unit. Background Technology

[0002] In the design and construction of railway tunnels, according to the relevant provisions of the current "Railway Tunnel Design Code", plain concrete lining is recommended for sections with surrounding rock grades I to III. When plain concrete lining is used, in order to improve the overall structural integrity and crack resistance, facing steel bars or structural steel bars are usually required as reinforcement measures in the arch wall area.

[0003] In this type of tunnel structure, the three-limb steel frame is an important pre-embedded support component, widely used for the structural connection between the lining reinforcement and concrete. The positioning and installation accuracy of the three-limb steel frame directly affects the subsequent reinforcement layout and the quality of concrete lining construction. However, in actual construction, the installation of the three-limb steel frame pre-embedded units often encounters problems such as height errors, angle deviations, and uneven protective layer thickness, affecting the reliability and durability of the support structure.

[0004] Current installation methods largely rely on manual measurement and positioning, which are cumbersome, physically demanding, and easily affected by the site environment, making it difficult to control installation accuracy. Furthermore, under complex construction conditions such as slippery tunnels, narrow passages, and insufficient lighting, the fixation and stability of the three-limb steel frame are difficult to guarantee, affecting work efficiency and construction safety. Therefore, developing an auxiliary device or control method suitable for tunnel construction sites that can improve the positioning and installation accuracy of the three-limb steel frame pre-embedded units and reduce manual intervention has become an urgent technical problem to be solved in the field of tunnel engineering. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a positioning clamp for the pre-embedded unit of the three-limb steel frame in a tunnel. The device has a stable structure, is easy to transport, and has a simple installation and disassembly process. It is suitable for the positioning and installation of the pre-embedded unit in the construction section of the three-limb steel frame in the tunnel.

[0006] The technical solution adopted by this utility model is as follows: a positioning clamp for a pre-embedded unit of a tunnel three-limb steel frame, the positioning clamp being installed on the top surface of the invert arch formwork, including a longitudinal adjustment base, a height adjustment arm, and a fixed connecting plate. The longitudinal adjustment base is set on the top surface of the invert arch formwork, the height adjustment arm includes a fixed rod and a movable rod, the lower part of the fixed rod is connected and fixed to the longitudinal adjustment base by bolts, and the position can be adjusted within a certain range in the longitudinal direction, the movable rod is connected and fixed to the fixed rod by bolts, and the position can be adjusted within a certain range in the vertical direction, one side of the movable rod is fixedly connected to a connecting rod, and the other end of the connecting rod is provided with a fixed connecting plate, the fixed connecting plate being connected and fixed to the top connecting plate of the pre-embedded unit of the three-limb steel frame by fasteners.

[0007] Furthermore, the longitudinal adjustment base is made of steel plate, with two parallel longitudinal strip holes spaced apart at the top and bottom of the steel plate, and two bolt holes spaced apart at the bottom of the fixing rod, and the two are connected by bolts.

[0008] Furthermore, two vertical elongated holes are opened at intervals on the upper part of the fixed rod, and two bolt holes are opened at intervals on the upper and lower parts of the movable rod, and the two are connected by bolts.

[0009] Furthermore, the fixed rod and the movable rod are made of two angle steels, with the two side plates of the two angle steels overlapping.

[0010] Furthermore, the fixed connecting plate is the same size as the top connecting plate of the three-limb steel frame pre-embedded unit.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] The combination of the longitudinal adjustment base and the height adjustment arm maximizes usability under different tooling sizes and design parameters. The inclusion of a fixed connecting plate of the same size as the top connecting plate of the three-limb steel frame pre-embedded unit increases the stability of the pre-embedded unit's installation. The longitudinal adjustment base and the height adjustment arm are bolted together for easy installation and disassembly. After use, the bolts connecting the longitudinal adjustment base and the height adjustment arm can be removed for easy transport. This device is easy to install and disassemble, convenient for storage and transportation, and its simple and stable structure is suitable for the positioning and installation of pre-embedded units in three-limb steel frame construction sections within tunnels. It is reusable. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a front view of the present invention;

[0015] Figure 3 This is a side view of the present invention.

[0016] In the diagram: 1. Longitudinal adjustment base; 2. Height adjustment arm; 21. Fixed rod; 22. Movable rod; 3. Connecting rod; 4. Fixed connecting plate; 5. Inverted arch formwork; 6. Three-limb steel frame pre-embedded unit. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] like Figures 1-3 As shown, a positioning clamp for a pre-embedded unit of a tunnel three-limb steel frame is installed on the top surface of the invert arch formwork 5. The positioning clamp includes a longitudinal adjustment base 1, a height adjustment arm 2, and a fixed connecting plate 4. The longitudinal adjustment base 1 is welded and fixed to the top surface of the invert arch formwork 5. The height adjustment arm 2 includes a fixed rod 21 and a movable rod 22. The fixed rod 21 is connected to the longitudinal adjustment base 1 by bolts and can be adjusted in a certain longitudinal range. The movable rod 22 is connected and fixed to the fixed rod 21 by bolts and can be adjusted in a certain vertical range. A connecting rod 3 is fixedly connected to one side of the movable rod 22, and a fixed connecting plate 4 is provided at the other end of the connecting rod 3. The fixed connecting plate 4 is connected and fixed to the top connecting plate of the pre-embedded unit of the three-limb steel frame 6 by fasteners.

[0019] In this embodiment, the longitudinal adjustment base 1 is made of steel plate, with two parallel longitudinal strip holes spaced apart vertically on the steel plate. The lower part of the fixing rod 21 has two bolt holes spaced apart vertically. The two are connected by bolts to ensure a reliable connection between the height adjustment arm 2 and the longitudinal adjustment base 1 and its verticality.

[0020] The fixed rod 21 and the movable rod 22 are made of two angle steels. The upper part of the fixed rod 21 has two vertical elongated holes spaced apart vertically, and the upper part of the movable rod 22 has two bolt holes spaced apart vertically. The two are connected by bolts to achieve the effect of adjusting the height. The two side plates of the two angle steels overlap, and the bolt holes and vertical elongated holes are not easy to misalign when adjusting the height, so as to satisfy the height adjustment while ensuring the stability of the device.

[0021] The connecting rod 3 is made of angle steel, with the fixed connecting plate 4 and the movable rod 22 welded to its two ends respectively. The fixed connecting plate 4 is a connecting plate of the same size as the top connecting plate of the three-limb steel frame embedded unit 6. During installation, the fixed connecting plate 4 is bolted to the top connecting plate of the three-limb steel frame embedded unit 6, which facilitates disassembly of the device after the concrete is poured. In addition, all angle steel in this device is made of 5*5cm angle steel, which ensures structural rigidity while making it lighter and easier to operate.

[0022] The above description only describes the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model, and all such changes should be included within the protection scope of the present utility model.

Claims

1. A positioning fixture for a tunnel three-legged steel frame embedded unit, characterized in that, The positioning fixture is installed on the top surface of the arch mold (5) and includes a longitudinal adjustment base (1), a height adjustment arm (2) and a fixed connecting plate (4). The longitudinal adjustment base (1) is set on the top surface of the arch mold (5). The height adjustment arm (2) includes a fixed rod (21) and a movable rod (22). The lower part of the fixed rod (21) is connected and fixed to the longitudinal adjustment base (1) by bolts, and the position can be adjusted within a certain range in the longitudinal direction. The movable rod (22) is connected and fixed to the fixed rod (21) by bolts, and the position can be adjusted within a certain range in the vertical direction. A connecting rod (3) is fixedly connected to one side of the movable rod (22), and a fixed connecting plate (4) is set at the other end of the connecting rod (3). The fixed connecting plate (4) is connected and fixed to the top connecting plate of the three-limb steel frame pre-embedded unit (6) by fasteners.

2. The positioning fixture for the embedded unit of the tunnel three- limb steel frame according to claim 1, characterized in that, The longitudinal adjustment base (1) is made of steel plate, with two parallel longitudinal strip holes spaced apart at the top and bottom of the steel plate. The lower part of the fixing rod (21) has two bolt holes spaced apart at the top and bottom, and the two are connected by bolts.

3. The positioning fixture for the pre-embedded unit of the tunnel three-limb steel frame according to claim 2, characterized in that, The upper part of the fixed rod (21) has two vertical elongated holes spaced apart, and the upper part of the movable rod (22) has two bolt holes spaced apart. The two are connected by bolts.

4. The positioning fixture for the embedded unit of the tunnel three-mass steel frame according to claim 3, characterized in that, The fixed rod (21) and the movable rod (22) are made of two angle steels, and the side plates of the two angle steels overlap.

5. The positioning fixture for the embedded unit of the tunnel three-mass steel frame according to any one of claims 1-4, characterized in that, The fixed connecting plate (4) has the same size as the top connecting plate of the three-limb steel frame pre-embedded unit (6).

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