Annular steel bar laying frame for tunnel construction

Abstract

The utility model discloses an annular reinforcing steel bar laying frame for tunnel construction, which is suitable for a tunnel with a ditch formed at the edge of a bottom plate, and comprises a plurality of roller frames which are arranged at intervals along the length direction of the tunnel and are used for supporting annular reinforcing steel bars, one end of the roller frame is placed on the surface of the bottom plate, and the other end of the roller frame abuts against the tunnel wall. According to the circumferential reinforcing steel bar laying frame for tunnel construction, the roller frames arranged in the length direction of the tunnel at intervals are adopted for supporting the circumferential reinforcing steel bars, and due to the fact that the roller frames are arranged at intervals, the contact area between the circumferential reinforcing steel bars and the roller frames is smaller than the contact area between the circumferential reinforcing steel bars and the tunnel ground when the circumferential reinforcing steel bars are directly placed on the tunnel ground; therefore, friction force borne by the circumferential steel bars in the dragging process can be effectively reduced, swing is reduced, and meanwhile the requirement for traction force of tunnel reinforcement cage operation equipment is lowered.

Description

Technical Field

[0001] This utility model mainly relates to the field of steel reinforcement construction technology, and in particular to a circumferential steel reinforcement laying frame for tunnel construction. Background Technology

[0002] Secondary lining (abbreviated as "secondary lining") is a commonly used term in tunnel engineering construction. It refers to the reinforced concrete lining constructed inside the initial support. Its purpose is to form a composite lining together with the initial support to achieve the function of reinforcing the support and thus meet the requirements of modern tunnel construction.

[0003] Secondary lining includes steel reinforcement construction, which involves binding together to form an arched steel reinforcement cage that conforms to the shape of the tunnel wall. With the advancement of steel reinforcement construction technology, tunnel steel reinforcement cage operation equipment capable of automatically placing steel reinforcement has emerged (such as the technical solution disclosed in Chinese patent application document CN1151631390, entitled "Tunnel Steel Reinforcement Cage Operation Equipment and Tunnel Steel Reinforcement Cage Construction Method"). During the steel reinforcement construction process using this equipment, the circumferential steel reinforcement is first placed on both sides of the tunnel, and then the tunnel steel reinforcement cage operation equipment drags, turns, and folds it into a circumferential arch shape.

[0004] In existing technology, the circumferential reinforcing bars to be tied are placed on the tunnel floor. When dragged by the tunnel reinforcing cage operation equipment, the circumferential reinforcing bars will experience severe friction on the ground. This friction can damage the tunnel and, due to the high frictional force, also places higher demands on the traction force of the tunnel reinforcing cage operation equipment. Furthermore, because there are many circumferential reinforcing bars, the frictional force can easily cause them to sway and become entangled with other reinforcing bars, thus affecting the smooth progress of construction. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a circumferential steel bar laying frame for tunnel construction.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A circumferential rebar placement frame for tunnel construction, suitable for tunnels with drainage ditches formed at the edge of the base slab, includes several roller frames spaced apart along the tunnel length to support the circumferential rebar; the roller frames span the drainage ditches, with one end placed on the base slab surface and the other end abutting against the tunnel wall.

[0008] The aforementioned setup provides a suitable placement location for the circumferential reinforcing bars required for tunnel construction with drainage ditches along the tunnel floor edge. Since the roller frame spans the ditch, the space above the ditch can be fully utilized to place the transverse reinforcing bars, thus avoiding the occupation of excessive tunnel floor area and saving construction space. The spaced roller frames, with one end resting on the floor surface and the other abutting against the tunnel wall, utilize friction to securely position themselves on the ditch. This design also enhances the load-bearing capacity of the roller frames, ensuring stable support for the circumferential reinforcing bars and creating favorable construction conditions for tunnels with drainage ditches along the floor edge, facilitating smooth tunnel construction. More importantly, because the roller frames are spaced apart, the contact area between the circumferential reinforcing bars and the roller frame is smaller than the contact area with the tunnel floor when placed directly on the floor. This effectively reduces the frictional force experienced by the circumferential reinforcing bars during dragging, thereby reducing swaying and lowering the traction force requirements of the tunnel reinforcement cage operation equipment. Furthermore, since the circumferential reinforcing bars no longer directly contact the tunnel floor, wear and tear on the tunnel is avoided.

[0009] In the aforementioned circumferential rebar placement frame for tunnel construction, preferably, the roller frame includes a support, on which a support member for supporting the circumferential rebar is installed. The support member is horizontally arranged, and its length direction is perpendicular to the length direction of the tunnel.

[0010] The horizontal arrangement of the support members provides a stable support platform for the circumferential reinforcing bars, preventing them from slipping and falling due to their own weight. Simultaneously, since the circumferential reinforcing bars will move along the length of the tunnel during the dragging process of the tunnel reinforcement cage operation equipment, setting the length direction of the support members perpendicular to the length direction of the tunnel, even if the support members are perpendicular to the direction of movement of the circumferential reinforcing bars, can reduce the frictional force between the circumferential reinforcing bars and the support members during movement.

[0011] In the aforementioned circumferential rebar placement frame for tunnel construction, preferably, the support members are arranged in two layers at vertical intervals. Two layers of vertically spaced support members can accommodate more circumferential rebars, preventing the rebars from piling up on a single support member and becoming entangled during movement.

[0012] In the aforementioned circumferential rebar placement frame for tunnel construction, preferably, the support member is cylindrical and rolls in engagement with the support. The circular shape of the support member and its rolling engagement with the support transforms the sliding friction between the circumferential rebar and the support member during construction into rolling friction, significantly reducing the traction force required by the equipment during the movement of the tunnel circumferential rebar. Simultaneously, it reduces the swing amplitude of the circumferential rebar during traction, effectively preventing entanglement and facilitating smoother construction.

[0013] In the aforementioned circumferential reinforcement placement frame for tunnel construction, preferably, the outer surface of the support member is smooth. A smooth outer surface of the support member can significantly reduce the frictional force between the circumferential reinforcement and the support member.

[0014] In the aforementioned circumferential steel bar placement frame for tunnel construction, preferably, the end of the support used to abut against the tunnel wall is configured as an arc surface, so as to fit snugly against the tunnel wall.

[0015] The curved support can better fit the curvature of the tunnel wall, which helps to improve the stability of the entire structure and reduce the safety risks caused by support displacement.

[0016] In the aforementioned circumferential rebar placement frame for tunnel construction, preferably, the roller frame further includes several legs fixed to the support, wherein at least one of the legs is supported on the surface of the base plate, and another leg is supported on the surface of the tunnel wall. This design ensures that the roller frame can adapt to uneven base plates and irregular tunnel walls, enhancing the flexibility of the roller frame arrangement and the overall applicability of the circumferential rebar placement frame for tunnel construction.

[0017] In the aforementioned circumferential rebar placement frame for tunnel construction, preferably, the lower end of each leg has a sharp claw. The sharp claw allows for easier fixation to the base plate and tunnel wall surface, providing stronger grip and ensuring the stability of the entire circumferential rebar placement frame for tunnel construction.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] This utility model discloses a circumferential rebar placement frame for tunnel construction. It employs several roller frames spaced at intervals along the tunnel length to support the circumferential rebar. Because the roller frames are spaced apart, the contact area between the circumferential rebar and the roller frames is smaller than the contact area with the tunnel surface when placed directly. This effectively reduces the frictional force experienced by the circumferential rebar during dragging, thereby reducing swaying and lowering the traction force requirements of the tunnel rebar cage operation equipment. Furthermore, since the circumferential rebar no longer directly contacts the tunnel surface, it avoids wear and tear on the tunnel. Attached Figure Description

[0020] Figure 1 This is a diagram illustrating the usage of a steel reinforcement rack inside a tunnel. Figure 1 ;

[0021] Figure 2 This is a diagram illustrating the usage of a steel reinforcement rack inside a tunnel. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the roller frame structure. Figure 1 ;

[0023] Figure 4This is a schematic diagram of the roller frame structure. Figure 2 .

[0024] The labels in the diagram represent: 01, base plate; 02, ditch; 03, tunnel; 04, circumferential reinforcement; 05, tunnel wall; 1, roller frame; 11, support; 12, support component; 13, support leg; 131, support claw. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example

[0027] like Figures 1 to 4 As shown, the circumferential rebar laying frame for tunnel construction in this embodiment is applicable to tunnel 03 where a drainage ditch 02 is formed at the edge of the bottom plate 01. It includes several roller frames 1 spaced apart along the length of the tunnel 03 to support the circumferential rebar 04. The roller frame 1 spans the drainage ditch 02, with one end placed on the surface of the bottom plate 01 and the other end abutting against the tunnel wall 05.

[0028] In this embodiment, the roller frame 1 includes a support 11, on which a support member 12 for supporting the circumferential reinforcing bar 04 is installed. The support member 12 is horizontally arranged and its length direction is perpendicular to the length direction of the tunnel 03.

[0029] In this embodiment, the support member 12 is arranged in two layers at vertical intervals. Circumferential reinforcing bars 04 can be placed on both layers of vertically spaced support member 12.

[0030] In this embodiment, the support member 12 is cylindrical and rolls with the support 11. During the traction process of the circumferential reinforcing bar 04 on the support member 12, the movement of the circumferential reinforcing bar 04 causes the support member 12 below it to rotate, which reduces the frictional resistance between the circumferential reinforcing bar 04 and the support member 12, and reduces the traction force requirement of the traction equipment.

[0031] In this embodiment, the outer surface of the support member 12 is smooth.

[0032] In this embodiment, the end of the support 11 that abuts against the tunnel wall 05 is configured as an arc shape, so that it can fit snugly against the tunnel wall 05. When placing the circumferential steel reinforcement laying frame for tunnel construction, the arc-shaped end of the support 11 must be tightly against the tunnel wall 05.

[0033] In this embodiment, the roller frame 1 further includes several legs 13 fixed to the support 11, wherein at least one leg 13 supports the surface of the base plate 01, and another leg 13 supports the surface of the tunnel wall 05. In this embodiment, three legs 13 are provided: one leg 13 supports the surface of the tunnel wall 05, and the other two legs 13 support the surface of the base plate 01. One leg 13 is located at the end of the roller frame 1, and the other leg 13 is located on the edge side of the base plate 01 near the ditch 02. In other embodiments, the number of legs 13 can also be two or four as needed.

[0034] In this embodiment, the lower end of the support leg 13 is formed with a sharp claw 131.

[0035] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A circumferential steel reinforcement laying frame for tunnel construction, suitable for tunnels (03) where a drainage ditch (02) is formed at the edge of the bottom slab (01), characterized in that: It includes several roller frames (1) spaced along the length of the tunnel (03) for supporting the circumferential reinforcing bars (04); the roller frames (1) span the ditch (02), with one end placed on the surface of the bottom plate (01) and the other end abutting against the tunnel wall (05).

2. The circumferential reinforcement laying frame for tunnel construction according to claim 1, characterized in that: The roller frame (1) includes a support (11) on which a support member (12) for supporting the circumferential reinforcing bar (04) is installed. The support member (12) is horizontally arranged and its length direction is perpendicular to the length direction of the tunnel (03).

3. The circumferential reinforcement laying frame for tunnel construction according to claim 2, characterized in that: The support member (12) has two layers spaced vertically.

4. The circumferential steel reinforcement laying frame for tunnel construction according to claim 2, characterized in that: The support member (12) is cylindrical and rolls with the support (11).

5. The circumferential reinforcement laying frame for tunnel construction according to claim 2, characterized in that: The outer surface of the support member (12) is smooth.

6. The circumferential steel reinforcement laying frame for tunnel construction according to claim 2, characterized in that: The end of the support (11) that abuts against the tunnel wall (05) is set in an arc shape so that it can fit against the tunnel wall (05).

7. The circumferential reinforcement laying frame for tunnel construction according to claim 2, characterized in that: The roller frame (1) also includes a number of legs (13) fixed on the support (11), wherein at least one of the legs (13) is supported on the surface of the base plate (01) and the other leg (13) is supported on the surface of the tunnel wall (05).

8. The circumferential reinforcement laying frame for tunnel construction according to claim 7, characterized in that: The lower end of the support leg (13) is formed with a sharp claw (131).

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