Foundation pit supporting device for building basement construction in subway protection area

Abstract

The utility model discloses a foundation pit supporting device for building basement construction in a subway protection area, and relates to the technical field of foundation pit supporting. The steel purlin is horizontally fixed on a concrete retaining wall on the side edge of a foundation pit, the steel supporting beam is connected to the steel purlin, a steel wire rope is arranged above the end, connected with the steel purlin, of the steel supporting beam, a tightening mechanism is arranged at the upper end of the steel purlin, one end of the steel wire rope is bundled on the steel supporting beam, and the other end of the steel wire rope is connected to the tightening mechanism. The steel wire rope bundled on the steel supporting beam is tensioned through the tightening mechanism; an anti-falling supporting structure is arranged at the lower end of the steel enclosing purlin and used for supporting the end, connected with the steel enclosing purlin, of the steel supporting beam. According to the device, the steel wire rope and the anti-falling supporting structure can have supporting prestress on the steel supporting beam, the fixing effect on the steel supporting beam is guaranteed, and inertia force generated when the steel supporting beam falls off is avoided; and fixed connection of the steel supporting beams is reinforced and upgraded more stably, so that the stability of the foundation pit support for building basement construction in the subway protection area is improved.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, and in particular to a foundation pit support device for the construction of basement buildings in subway protection zones. Background Technology

[0002] Subway vehicles operating on rail transit lines must ensure a safe space for the line structure. According to relevant regulations, this space is generally within 50 meters of the structure's perimeter, and this space can be called a protected area. During the excavation phase of underground construction on subway rail transit lines, the support of the foundation pit is particularly important. Foundation pit support refers to the measures taken to support, reinforce, and protect the sidewalls and surrounding environment to ensure the safety of underground structure construction and the surrounding environment. Steel bracing is a common form of foundation pit support. Steel bracing refers to support devices using steel pipes, H-beams, angle steel, etc., and is generally an inclined connecting component, most commonly in A-frame or cross shapes. Steel bracing is widely used in subway and foundation pit support. Because steel bracing is recyclable, it has economic and environmentally friendly characteristics.

[0003] In existing technologies, the steel pipes used as steel support beams are typically fixed to the inner wall of the foundation pit at their ends by steel walers. To prevent the steel support beam ends from falling off due to vibration or breakage at the connection point, a safety-type fixing method is generally used: the upper part of the steel support beam end is suspended by a steel wire rope, and the lower part is supported by a support structure. However, this post-installation structure is usually implemented after the steel support beam has been installed. Therefore, the steel wire rope may not be pulled in during suspension, resulting in insufficient prestress. Similarly, the lower support structure cannot provide prestress to the steel support beam end. If the steel support beam end falls, the steel wire rope and support structure must bear not only the weight of the steel support beam itself but also the inertial force of the falling beam, which can easily lead to breakage of the support structure, making this safety method unreliable. To improve this problem, a foundation pit support device for the construction of basements in subway protected areas is designed. Utility Model Content

[0004] The purpose of this utility model is to provide a foundation pit support device for the construction of basement buildings in subway protection zones in order to solve the above-mentioned problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] The present invention relates to a foundation pit support device for the construction of a basement in a subway protected area, comprising a steel waler horizontally fixed on a concrete retaining wall on the side of the foundation pit and a steel support beam connected to the steel waler. A steel wire rope is provided above the connection end of the steel support beam to the steel waler. A tightening mechanism is provided at the upper end of the steel waler. One end of the steel wire rope is tied to the steel support beam and the other end is connected to the tightening mechanism so that the steel wire rope tied to the steel support beam is tightened by the tightening mechanism.

[0007] The lower end of the steel waler is provided with an anti-fall-off support structure to support the end of the steel support beam that is connected to the steel waler.

[0008] Furthermore, the tightening mechanism includes a fixed plate fixed to the upper end of the steel waler and a movable plate located above the steel waler and on the side opposite to the steel support beam of the fixed plate;

[0009] The fixing plate has a first mounting hole at its center for the steel wire rope to pass through.

[0010] The movable plate has two second mounting holes for the steel wire rope to pass through;

[0011] The fixed plate is provided with multiple sets of first tightening bolts that are tightened against the movable plate.

[0012] Furthermore, the end of the wire rope passes through the first mounting hole and one of the second mounting holes, and then passes through the other second mounting hole.

[0013] Furthermore, a limiting annular plate is fixedly installed on one side surface of the steel support beam that is connected to the steel waler. An annular baffle extends from the outer side of the limiting annular plate toward the side opposite to the steel waler. A notch is provided at the top of the annular baffle to allow the steel wire rope to pass through. A space is left between the annular baffle and the steel support beam to allow the steel wire rope to enter.

[0014] Furthermore, the anti-fall-off support structure includes a fixed base plate connected to the steel waler. The fixed base plate is provided with a second fastening bolt that is driven upward into the fixed base plate. An L-shaped steel support plate is provided above the fixed base plate to support the lower surface of the end of the steel support beam that is connected to the steel waler. The second fastening bolt is tightened against the lower surface of the L-shaped steel support plate to press the L-shaped steel support plate against the lower surface of the steel support beam.

[0015] Furthermore, a triangular reinforcing rib is connected between the lower surface of the fixed base plate and the steel waler.

[0016] The foundation pit support device for basement construction in subway protected areas provided by this utility model has the following beneficial effects:

[0017] This device ensures the steel support beam is fixed by providing prestress to the steel wire rope and anti-fallback support structure, thus preventing the steel support beam from being subjected to inertial forces when it falls. This strengthens and upgrades the fixed connection of the steel support beam, improving the stability of the foundation pit support used for the construction of basement buildings in subway protection zones. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the foundation pit support device for the construction of the basement of a subway protected area building, provided as an embodiment of this utility model;

[0020] Figure 2 A side view of a foundation pit support device for the construction of a basement in a subway protected area, provided in an embodiment of this utility model;

[0021] Figure 3 A schematic diagram of the tightening mechanism of the foundation pit support device for the construction of the basement of a subway protected area building, provided in an embodiment of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Steel waler; 2. Steel support beam; 3. Steel wire rope; 4. Fixing plate; 5. Movable plate; 6. First mounting hole; 7. Second mounting hole; 8. First tightening bolt; 9. Limiting ring plate; 10. Ring baffle; 11. Notch; 12. Fixing base plate; 13. Second fastening bolt; 14. L-shaped steel support plate; 15. Triangular reinforcing rib plate. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] Please see Figure 1-3The foundation pit support device for the construction of the basement of a subway protected area includes a steel waler 1 horizontally fixed on the concrete retaining wall on the side of the foundation pit and a steel support beam 2 connected to the steel waler 1. The two ends of the horizontally set steel support beam 2 are supported on the steel walers 1 on both sides to provide more stable support for the foundation pit. A steel wire rope 3 is set above the connection end of the steel support beam 2 with the steel waler 1. A tightening mechanism is set at the upper end of the steel waler 1. One end of the steel wire rope 3 is tied to the steel support beam 2 and the other end is connected to the tightening mechanism. The tightening mechanism pulls the steel wire rope 3 tied to the steel support beam 2, thereby giving the steel wire rope 3 prestress to support the steel support beam 2 and improving the connection stability of the steel support beam 2.

[0026] A fall-off protection structure is provided at the lower end of the steel waler 1 to support the end of the steel support beam 2 that is connected to the steel waler 1. The fall-off protection structure supports the bottom of the steel waler 1 and applies prestress to the bottom of the steel support beam 2 to support the steel support beam 2 more stably and further improve the connection stability of the steel support beam 2.

[0027] Furthermore, the tightening mechanism includes a fixed plate 4 fixed to the upper end of the steel waler 1 and a movable plate 5 located above the steel waler 1 and on the side opposite to the steel support beam 2 of the fixed plate 4. That is, the fixed plate 4 and the movable plate 5 are set on the steel waler 1 in a fixed and movable manner.

[0028] The fixing plate 4 has a first mounting hole 6 at its center, through which the steel wire rope 3 passes;

[0029] The movable plate 5 has two second mounting holes 7 for the steel wire rope 3 to pass through;

[0030] Multiple sets of first tightening bolts 8 are provided on the fixed plate 4 and are tightened against the movable plate 5.

[0031] Furthermore, the end of the wire rope 3 passes through the first mounting hole 6 and one of the second mounting holes 7, and then passes through the other second mounting hole 7.

[0032] Specifically, the function of the tightening mechanism is to prestress the wire rope 3 after one end is connected. Specifically, the end of the wire rope 3 first passes through the first mounting hole 6, then through one of the second mounting holes 7, and then bends back through the second mounting hole 7. Subsequently, multiple sets of first tightening bolts 8 are rotated to press against the movable plate 5, causing the movable plate 5 to pull the wire rope 3 until it is taut, thus straightening and tightening the wire rope 3. A set of first tightening bolts 8 can be tightened at the last second mounting hole 7 to further compress the wire rope 3, thereby achieving a stable fixation of the end of the wire rope 3.

[0033] Furthermore, a limiting annular plate 9 is fixedly installed on the side surface of the steel support beam 2 that connects to the steel waler 1. An annular baffle 10 extends from the outer side of the limiting annular plate 9 toward the side opposite to the steel waler 1. A notch 11 is provided at the top of the annular baffle 10 to allow the wire rope 3 to pass through. A space is left between the annular baffle 10 and the steel support beam 2 for the wire rope 3 to enter. Specifically, to prevent the end of the wire rope 3 tied to the steel support beam 2 from falling off, a limiting annular plate 9 is provided on the steel support beam 2 to restrict the wire rope 3 from slipping radially on the steel support beam 2. The annular baffle 10 further restricts the wire rope 3 and allows the end of the wire rope 3 extending toward the tightening mechanism to pass through the notch 11 for installation.

[0034] Furthermore, the anti-fall-off support structure includes a fixed base plate 12 connected to the steel waler 1. The fixed base plate 12 is provided with a second fastening bolt 13 that pushes upward into the fixed base plate 12. An L-shaped steel support plate 14 is provided above the fixed base plate 12 to support the lower surface of the end of the steel support beam 2 that is connected to the steel waler 1. The second fastening bolt 13 is pressed against the lower surface of the L-shaped steel support plate 14 to press the L-shaped steel support plate 14 against the lower surface of the steel support beam 2.

[0035] Specifically, the fixed base plate 12 is fixed in position and located below the steel support beam 2. After the steel support beam 2 is installed, the L-shaped steel support plate 14 is placed on the bottom of the steel support beam 2, and the second fastening bolt 13 is rotated to tighten it against the bottom of the L-shaped steel support plate 14. This causes the L-shaped steel support plate 14 to also be tightened against the bottom of the steel support beam 2, forming a prestress for supporting the steel support beam 2. This provides more stable support for the steel support beam 2 and prevents the end from falling off directly in case of connection failure, thus improving construction safety.

[0036] Furthermore, a triangular reinforcing rib 15 is connected between the lower surface of the fixed base plate 12 and the steel waler 1 to improve the connection stability of the fixed base plate 12 on the steel waler 1.

[0037] In summary, this device, by enabling the wire rope and anti-fallback support structure to provide prestress to the steel support beam, ensures the fixation effect of the steel support beam, avoids bearing the inertial force when the steel support beam falls, and more reliably strengthens and upgrades the fixed connection of the steel support beam, thereby improving the stability of the foundation pit support used for the construction of the basement of the subway protection zone building.

[0038] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A foundation pit support device for the construction of a basement in a subway protected area, comprising a steel waler (1) horizontally fixed to a concrete retaining wall on the side of the foundation pit and a steel support beam (2) connected to the steel waler (1), characterized in that, A steel wire rope (3) is installed above the connection end of the steel support beam (2) and the steel waler (1). A tightening mechanism is installed at the upper end of the steel waler (1). One end of the steel wire rope (3) is tied to the steel support beam (2) and the other end is connected to the tightening mechanism so that the steel wire rope (3) tied to the steel support beam (2) is tightened by the tightening mechanism. The lower end of the steel waler (1) is provided with an anti-fall-off support structure to support the end of the steel support beam (2) that is connected to the steel waler (1).

2. The foundation pit support device for basement construction in a subway protected area as described in claim 1, characterized in that, The tightening mechanism includes a fixed plate (4) fixed to the upper end of the steel waler (1) and a movable plate (5) located above the steel waler (1) and on the side opposite to the steel support beam (2) of the fixed plate (4); The fixing plate (4) has a first mounting hole (6) at its center, through which the steel wire rope (3) passes; The movable plate (5) has two second mounting holes (7) through which the steel wire rope (3) passes; Multiple sets of first tightening bolts (8) are provided on the fixed plate (4) and tightened against the movable plate (5).

3. The foundation pit support device for basement construction in a subway protected area as described in claim 2, characterized in that, The end of the wire rope (3) passes through the first mounting hole (6) and one of the second mounting holes (7), and then passes through the other second mounting hole (7).

4. The foundation pit support device for basement construction in a subway protected area as described in claim 1, characterized in that, A limiting ring plate (9) is fixedly installed on one end side surface of the steel support beam (2) that is connected to the steel waler (1). An annular baffle (10) extends from the outer side of the limiting ring plate (9) toward the side opposite to the steel waler (1). A notch (11) is provided at the top of the annular baffle (10) to allow the steel wire rope (3) to pass through. A space is left between the annular baffle (10) and the steel support beam (2) to allow the steel wire rope (3) to enter.

5. The foundation pit support device for basement construction in a subway protected area as described in claim 1, characterized in that, The anti-fall-off support structure includes a fixed base plate (12) connected to the steel waler (1). The fixed base plate (12) is provided with a second fastening bolt (13) that is driven upward into the fixed base plate (12). An L-shaped steel support plate (14) is provided above the fixed base plate (12) to support the lower surface of the end of the steel support beam (2) connected to the steel waler (1). The second fastening bolt (13) is pressed against the lower surface of the L-shaped steel support plate (14) to press the L-shaped steel support plate (14) against the lower surface of the steel support beam (2).

6. The foundation pit support device for basement construction in a subway protected area building according to claim 5, characterized in that, A triangular reinforcing rib (15) is connected between the lower surface of the fixed base plate (12) and the steel waler (1).

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