Temporary anchoring and pulling support device in slope excavation of reconstructed and expanded expressway

Abstract

The utility model discloses a temporary anchoring support device in slope excavation of a reconstructed and expanded expressway, which is characterized in that a reinforcing steel bar limiter is arranged on a concrete pipeline, and a reinforcing steel bar penetrating through an embedded sleeve and a reinforcing steel bar of a residual anchor rod body are kept at the same angle by adjusting the reinforcing steel bar limiter; the steel bars are prevented from bearing unnecessary bending stress, firm connection between the steel bars and the concrete filled steel tube can be guaranteed, stress borne by the concrete filled steel tube can be effectively transferred into the residual anchor rod body, and the device is low in cost and simple in structure and does not hinder normal proceeding of follow-up construction while a temporary supporting structure is effectively added.

Description

Technical Field

[0001] This utility model belongs to the field of road safety protection technology, specifically relating to a temporary anchor support device for the excavation of slopes during the reconstruction and expansion of highways. Background Technology

[0002] The safe construction of secondary excavation of road cut slopes is a technical challenge in the reconstruction and expansion of operational highways, and it is particularly common in mountainous highway reconstruction and expansion projects. Secondary excavation of slopes in reconstruction and expansion projects must consider the safety of highway operation during the construction period and environmental impact factors. Excavation and support methods are limited, and traffic organization and construction management are difficult. Secondary excavation of slopes will damage the existing support structure, creating a new exposed surface. If the strength, rigidity, and support time of the newly constructed support structure are insufficient, it can easily lead to slope instability, affecting the safety of adjacent operational highways.

[0003] Anchor bolt (cable) support is a common support method for road soil slopes. In traditional excavation construction, as the excavation progresses from top to bottom and from the slope surface to the interior, the anchor bolts (cables) are destroyed and removed along with the soil. If the anchor bolt length is small and the excavation width is large, the anchor bolt is completely removed; if the anchor bolt length is large, some will remain in the soil. Traditional design and construction schemes do not consider the utilization of residual anchor bolts. Utility Model Content

[0004] The purpose of this invention is to provide a temporary anchor support device for the excavation of slopes in highway reconstruction and expansion. This device ensures that the reinforcing bars passing through the pre-embedded sleeve maintain the same angle as the reinforcing bars of the remaining anchor rod by setting a reinforcing bar limiter, thus avoiding unnecessary bending stress on the reinforcing bars and ensuring a firm connection between the reinforcing bars and the steel pipe concrete. This allows the stress on the steel pipe concrete to be effectively transferred to the remaining anchor rod, and the existing anchor rod is used to reinforce the temporary support in the reverse direction. This device effectively increases the temporary support structure while being low in cost and does not hinder the normal progress of subsequent construction.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A temporary anchoring support device for slope excavation in highway reconstruction and expansion includes a concrete pipe and a rebar limiter. The lower end of the concrete pipe is firmly embedded in the slope. A pre-embedded steel pipe is installed inside the concrete pipe and penetrates the side curved surface of the concrete pipe. Rebar passes through the pre-embedded steel pipe, and one end of the rebar is connected to the existing anchor rod in the slope through a sleeve. A rebar limiter is fixed on the side curved surface of the concrete pipe to fasten the rebars passing through both ends of the pre-embedded steel pipe.

[0007] The rebar limiter includes at least two pairs. Each pair of rebar limiters consists of two symmetrically arranged U-shaped clamps and a steel block. The concave arc surfaces of the two U-shaped clamps are arranged opposite each other, and the opposite sides of the two U-shaped clamps are slidably inserted into the steel block through a connecting rod. After the rebar passes through the end of the pre-embedded steel pipe, it passes between the opposite sides of each pair of rebar limiters. The two U-shaped clamps of each pair of rebar limiters are fastened by fasteners to clamp the rebar. The steel block is welded and fixed to the side curved surface of the concrete pipe.

[0008] Both ends of the U-shaped clamp extend outward in a direction perpendicular to the connecting rod to form extension ends. The extension ends are provided with threaded holes. After the threaded holes of the extension ends of each pair of rebar limiters are aligned, the two opposite rebar limiters are connected by fasteners. After the two U-shaped clamps are engaged with the rebars, they transition and cooperate with each other.

[0009] The inclination of the pre-embedded steel pipe relative to the central axis in the concrete pipe is the same as that of the anchor rod.

[0010] The reinforcing bars are equipped with stress gauges.

[0011] The concrete pipe is also equipped with geotextile bags tied with steel wires. The geotextile bags are filled with cement mortar and wrap two pairs of steel bar limiters.

[0012] The beneficial effects of this utility model are: using the existing anchor rods at the bottom layer of the slope for temporary support and reinforcement, this reinforcement effectively increases the temporary support structure without adding new anchor rods, which is inexpensive and does not hinder the normal progress of subsequent construction. The structure is simple and easy to set up. Attached Figure Description

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

[0014] Figure 2 This is a schematic diagram of the concrete pipe of this utility model;

[0015] Figure 3 This is a schematic diagram of the rebar limiter structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the rebar limiter and rebar assembly of this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0018] like Figure 1-4 As shown, a temporary anchoring support device for slope excavation in highway reconstruction and expansion includes a concrete pipe 1 and a rebar limiter 3. The lower end of the concrete pipe 1 is embedded in the slope, and a pre-embedded steel pipe 2 is installed inside the concrete pipe 1. The pre-embedded steel pipe 2 penetrates the side curved surface of the concrete pipe 1 (i.e., the non-end face part of the concrete pipe 1). A rebar 5 passes through the pre-embedded steel pipe 2, and one end of the rebar 5 is connected to the existing anchor rod body 8 in the slope through a sleeve 7. A rebar limiter 3 is fixed on the side curved surface of the concrete pipe 1 for tightening. The reinforcing bars 5 pass through both ends of the pre-embedded steel pipe 2. The reinforcing bar limiters 3 include at least two pairs. Each pair of limiters 3 consists of two symmetrically arranged U-shaped clamps 32 and a steel block 4. The concave arc surfaces of the two U-shaped clamps 32 are positioned opposite each other, and the opposite sides of the two U-shaped clamps 32 are slidably inserted into the steel block 4 via a connecting rod 31. After the reinforcing bar 5 passes through the end of the pre-embedded steel pipe 2, it passes between the opposite sides of each pair of limiters 3. The two U-shaped clamps 32 of each pair of limiters 3 are fastened with fasteners to clamp the reinforcing bar 5. The steel block 4 is welded and fixed to the side curved surface of the concrete pipe 1. Each pair of limiters 3 can slide relative to the steel block 4, adjusting the distance between each pair of limiters 3 to accommodate reinforcing bars 5 of different diameters.

[0019] Furthermore, the two ends of the U-shaped clamp 32 extend outward in a direction perpendicular to the connecting rod 31 to form extension ends 33. The extension ends 33 are provided with threaded holes 34. After the threaded holes 34 of the extension ends 33 of each pair of rebar limiters 3 are aligned, the two opposite rebar limiters 3 are connected by fasteners. At this time, the two U-shaped clamps 32 are engaged with the rebars, and the two are in transitional fit.

[0020] Furthermore, the inclination of the pre-embedded steel pipe 2 relative to the central axis in the concrete pipe 1 is the same angle as that of the residual anchor rod 8. In this way, after the reinforcing bar 5 is welded to the residual anchor rod 8 and secured by the reinforcing bar limiter 3, unnecessary bending stress on the reinforcing bar 5 is avoided; at the same time, it can ensure that the reinforcing bar 5 is firmly connected to the concrete pipe 1, so that the force on the concrete pipe 1 can be effectively transferred to the residual anchor rod 8.

[0021] Furthermore, a geotextile bag 10 is fitted over the concrete pipe 1. The geotextile bag 10 is tied to the curved surface of the concrete pipe 1 with steel wires 11 on its upper and lower sides, so that the geotextile bag 10 wraps around two pairs of rebar limiters 3. The damaged parts of the geotextile bag 10 where the rebar 5 passes through are also tied to the rebar 5 with steel wires 11. The geotextile bag 10 is filled with cement mortar 9, which is injected into the geotextile bag 10 through the through hole on the pre-embedded steel pipe 2 to form a solidified body. A rebar gauge 6 is welded to the rebar 5 to monitor the stress of the rebar 5.

[0022] The above description is merely 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 temporary anchoring support device for slope excavation in the reconstruction and expansion of highways, characterized in that, It includes a concrete pipe (1) and a steel bar limiter (3). The lower end of the concrete pipe (1) is firmly embedded in the slope. A pre-embedded steel pipe (2) is provided inside the concrete pipe (1). The pre-embedded steel pipe (2) passes through the side curved surface of the concrete pipe (1). The steel bar (5) passes through the pre-embedded steel pipe (2), and one end of the steel bar (5) is connected to the existing anchor rod (8) in the slope through a sleeve (7). A steel bar limiter (3) is fixed on the side curved surface of the concrete pipe (1) to fasten the steel bars (5) passing through both ends of the pre-embedded steel pipe (2).

2. The temporary anchoring support device for slope excavation in highway reconstruction and expansion according to claim 1, characterized in that, The rebar limiter (3) includes at least two pairs. Each pair of rebar limiters (3) consists of two symmetrically arranged U-shaped clamps (32) and a steel block (4). The concave arc surfaces of the two U-shaped clamps (32) are arranged opposite each other, and the opposite sides of the two U-shaped clamps (32) are slidably inserted into the steel block (4) through a connecting rod (31). After the rebar (5) passes through the end of the pre-embedded steel pipe (2), it passes between the opposite sides of each pair of rebar limiters (3). The two U-shaped clamps (32) of each pair of rebar limiters (3) are fastened by fasteners to clamp the rebar (5). The steel block (4) is welded and fixed to the side curved surface of the concrete pipe (1).

3. A temporary anchor support device for slope excavation in highway reconstruction and expansion according to claim 2, characterized in that, The two ends of the U-shaped clamp (32) extend outward in a direction perpendicular to the connecting rod (31) to form an extension end (33). The extension end (33) is provided with a threaded hole (34). After the threaded holes (34) of the extension end (33) of each pair of rebar limiters (3) are aligned, the two opposite rebar limiters (3) are connected by fasteners. After the two U-shaped clamps (32) are engaged with the rebar (5), they transition and cooperate with each other.

4. A temporary anchor support device for slope excavation in highway reconstruction and expansion according to claim 1, characterized in that, The inclination of the pre-embedded steel pipe (2) relative to the central axis in the concrete pipe (1) is the same as that of the anchor rod (8).

5. A temporary anchor support device for slope excavation in highway reconstruction and expansion according to claim 1, characterized in that, The reinforcing bar (5) is equipped with a stress gauge (6).

6. A temporary anchor support device for slope excavation in highway reconstruction and expansion according to claim 1, characterized in that, The concrete pipe (1) is also provided with a geotextile bag (10) tied with steel wire (11), the geotextile bag (10) is filled with cement mortar (9), and the geotextile bag (10) wraps two pairs of steel bar limiters (3).

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