Foundation pit supporting device without inner support

Abstract

The utility model discloses a foundation pit supporting device without an inner support, which comprises a supporting device arranged in a foundation pit, the supporting device comprises prefabricated parts which are pressed on the inner wall of the foundation pit by virtue of gravity and are made of reinforced concrete, an open area is formed between the oppositely distributed prefabricated parts in the foundation pit, and accommodating cavities are formed in the prefabricated parts. The top of the containing cavity is open, the bottom of the containing cavity is closed, and the containing cavity is filled with weights for increasing the weight of the prefabricated part. An inner supporting structure does not need to be arranged, so that an open area is formed above the foundation pit, the area of hoisting operation is enlarged, and the efficiency of hoisting operation is higher.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, specifically to a foundation pit support device that does not require internal support. Background Technology

[0002] To ensure the safety of construction within the foundation pit, it is usually necessary to support, reinforce, and protect the sidewalls of the foundation pit. Existing technologies for supporting the sidewalls of foundation pits often use planar support plates to form underground continuous walls. For example, the invention patent with authorization announcement number CN110230317B discloses a subway foundation pit support structure, which includes support plates and support rods. The support plates are integral planar structures that are in direct contact with the sidewalls of the foundation pit. The support rods are distributed laterally and longitudinally to form internal support for the support plates on both sides, thereby supporting the sidewalls of the foundation pit.

[0003] However, the distribution of the support rods in this type of support device occupies the area above the foundation pit. As a result, when carrying out hoisting operations in the foundation pit, the hoisting path needs to avoid the support rods and hoist through some gaps, which restricts the hoisting area and reduces the efficiency of hoisting operations. Utility Model Content

[0004] The purpose of this utility model is to provide a foundation pit support device that does not require internal support. Since there is no need to set up an internal support structure, the area above the foundation pit is an open area, which expands the area for hoisting operations and makes the hoisting operations more efficient.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following solution:

[0006] A foundation pit support device that does not require internal support includes a support device installed inside the foundation pit. The support device includes precast reinforced concrete components that are pressed against the inner wall of the foundation pit by gravity. There are open areas between the precast components that are relatively distributed inside the foundation pit. Each precast component has a receiving cavity with an open top and a closed bottom. The receiving cavity is filled with a weight-adding material to increase the weight of the precast component.

[0007] In existing technology, the inner wall of the foundation pit has four supports, and suitable support plates are installed on the inner wall. The support plates are supported by the pressure of the support rods to form internal support, thereby providing effective support for each side wall of the foundation pit. The support rods are generally distributed in multiple directions, both horizontally and vertically. For foundation pits with greater depth, multiple layers of support rods are also distributed vertically. As a result, the support rods obstruct the area above the foundation pit, which greatly restricts the hoisting path when hoisting operations are carried out inside the foundation pit.

[0008] In this scheme, the precast components are made of reinforced concrete, a material with high strength and durability, capable of withstanding the lateral pressure and soil deformation generated during the excavation of the foundation pit. The precast components adhere tightly to the inner wall of the foundation pit under their own weight, eliminating the need for additional support structures and simplifying the construction process. Each precast component has an internal cavity, open at the top and closed at the bottom, filled with weight-adding materials. These materials increase the weight of the precast components, thereby improving their stability and support effect. By adjusting the quantity and type of weight-adding materials, the weight and support performance of the precast components can be flexibly controlled. Since the precast components can independently support the sidewalls of the foundation pit, there is no need for existing support rods between them. Therefore, the areas between the relatively distributed precast components within the foundation pit are open spaces. These open spaces not only facilitate construction but also help reduce the space occupied by the support devices within the foundation pit. This allows for unobstructed hoisting operations within the foundation pit, increasing the hoisting area and making the hoisting path smoother, thus improving the efficiency of the hoisting operation.

[0009] Optionally, it also includes a base, the top surface of which is an inclined surface that slopes toward the inner wall of the pit. The precast component is installed at an incline on the top surface of the base. The precast component and the base are cast as one piece. The precast component is pressed against the inner wall of the pit by gravity. The inner wall of the pit is an inclined surface that matches the inclination of the precast component.

[0010] Optionally, the vertical cross-section of the precast component is wedge-shaped, and the side of the precast component away from the inner wall of the pit is inclined.

[0011] Optionally, the bottom surface of the base has a number of teeth distributed thereon, and the teeth are serrated.

[0012] Optionally, lifting lugs are pre-embedded on both sides of the top of the precast component.

[0013] Optionally, the outer and inner walls of the precast component are provided with a number of lapped reinforcing bars that are connected to the internal reinforcing bars of the precast component, and the lapped reinforcing bars are connected to the binding reinforcing bars in the foundation pit later.

[0014] Optionally, the weight-adding material may be soil, water, or mud.

[0015] Optionally, the preform is provided with a cover plate on top, which closes the opening of the receiving cavity.

[0016] Optionally, U-shaped steel bars are pre-embedded on the side wall of the receiving cavity adjacent to the inner wall of the foundation pit. The U-shaped steel bars are distributed at intervals from top to bottom to form a ladder, and the opening of the receiving cavity allows workers to pass through.

[0017] The beneficial effects of this utility model are:

[0018] In this invention, since the precast components can independently support the sidewalls of the foundation pit, there is no need to install support rods between the precast components as in the prior art. Therefore, the precast components distributed relatively in the foundation pit form an open area. This open area not only facilitates construction but also helps to reduce the space occupied by the support device in the foundation pit. Thus, when hoisting operations are carried out in the foundation pit, there is no obstruction from support rods, the hoisting area is increased, the hoisting path is smoother, and the efficiency of hoisting operations is improved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a top view of the structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the tooth distribution structure on the bottom surface of the base.

[0022] Attached reference numerals: 1-Foundation pit, 2-Base, 3-U-shaped steel bar, 4-Precast component, 5-Receiving cavity, 6-Cover plate, 7-Water pump, 8-Weighting material, 9-Overlapping steel bar, 10-Lifting lug, 11-Tooth. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0024] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example

[0027] A foundation pit support device without internal support includes a support device installed inside the foundation pit 1. The support device includes a precast reinforced concrete component 4 that is pressed against the inner wall of the foundation pit 1 by gravity. There is an open area between the precast components 4 that are relatively distributed inside the foundation pit 1. The precast component 4 has a receiving cavity 5 inside. The receiving cavity 5 is open at the top and closed at the bottom. The receiving cavity 5 is filled with a weight-increasing material 8 to increase the weight of the precast component 4.

[0028] In the existing technology, the inner wall of the foundation pit 1 has four support plates, and the inner wall of the foundation pit 1 is equipped with suitable support plates. The support plates are supported by the pressure of the support rods to form internal support, thereby providing effective support for each side wall of the foundation pit 1. The support rods are generally distributed in multiple directions, and in foundation pits with a large depth, multiple layers of support rods are also distributed vertically. In this way, the support rods block the area above the foundation pit 1, which greatly restricts the hoisting path when hoisting operations are carried out inside the foundation pit 1.

[0029] In this embodiment, as Figure 1 As shown, precast component 4 is made of reinforced concrete, a material with high strength and durability, capable of withstanding the lateral pressure and soil deformation generated during the excavation of foundation pit 1. Precast component 4 adheres tightly to the inner wall of foundation pit 1 under its own weight, eliminating the need for additional support structures and simplifying the construction process. In practice, anchor rods can be installed on the sidewalls of foundation pit 1, connecting to the sidewalls of the precast component. These anchor rods utilize commonly available products to further improve the support stability of the precast component. Precast component 4 has an internal cavity 5, open at the top and closed at the bottom. The cavity 5 is filled with a weighting material 8, which increases the weight of precast component 4. This improves stability and support effectiveness. By adjusting the quantity and type of the weights 8, the weight and support performance of the precast components 4 can be flexibly controlled. Since the precast components 4 can independently support the sidewalls of the pit 1, there is no need to install support rods between the precast components 4 as in the prior art. Therefore, the precast components 4 distributed relatively in the pit 1 form an open area. This open area not only facilitates construction but also helps reduce the space occupied by the support device in the pit 1. Thus, when hoisting operations are carried out in the pit 1, there is no obstruction from support rods, the hoisting operation area is increased, and the hoisting path is smoother, thereby improving the efficiency of hoisting operations.

[0030] Furthermore, it also includes a base 2, the top surface of which is an inclined surface that slopes toward the inner wall of the pit 1. The precast component 4 is installed at an incline on the top surface of the base 2. The precast component 4 and the base 2 are integrally cast and formed. The precast component 4 is pressed onto the inner wall of the pit 1 by gravity. The inner wall of the pit 1 is an inclined surface that matches the inclination of the precast component 4.

[0031] Specifically, the top surface of the base 2 is designed as an inclined surface sloping towards the inner wall of the pit 1, allowing the precast component 4 to be installed on the base 2 at an angle. This shifts the center of gravity of the precast component 4 towards the inner wall of the pit 1, resulting in a closer fit. This inclined installation method not only enhances the stability of the support device but also helps to disperse and resist lateral pressure from the side wall of the pit 1. The precast component 4 and the base 2 are manufactured using an integral casting method. This manufacturing method ensures a firm connection between the precast component 4 and the base 2, avoiding safety hazards caused by weak connections. At the same time, integral casting simplifies the construction process and improves work efficiency. Due to the inclined design of the top surface of the base 2, the precast component 4 can be inclined and pressed against the inner wall of the pit 1 during installation, improving the support effect and helping to resist lateral displacement that may occur during the excavation of the pit 1, thereby maintaining the stability of the pit 1 and reducing the risk of collapse. Overall, the inclined design of the base 2 and the inclined installation method of the precast component 4 together enhance the stability of the support device, enabling it to better resist various forces that may be generated during the excavation of the foundation pit 1. The close fit between the precast component 4 and the inner wall of the foundation pit 1, as well as the filling of the weight 8, together improve the support effect of the support device and ensure the safety of the foundation pit 1 during the excavation process.

[0032] Furthermore, the vertical cross-section of the precast component 4 is wedge-shaped, and the side of the precast component 4 away from the inner wall of the pit 1 is an inclined surface.

[0033] Furthermore, the bottom surface of the base 2 is provided with a plurality of teeth 11, and the plurality of teeth 11 are serrated.

[0034] Specifically, such as Figure 3 As shown, the serrated teeth 11 on the bottom surface of the base 2 can significantly increase the contact area and friction between the support device and the soil at the bottom of the pit 1, thereby enhancing the grip of the support device. This enhanced grip helps to resist the horizontal displacement and soil loosening that may occur during the excavation of the pit 1, and improves the overall stability of the support device.

[0035] Furthermore, lifting lugs 10 are pre-embedded on both sides of the top of the precast component 4.

[0036] Specifically, the lifting lug 10 is generally made of round steel bent into shape. After being welded to the steel bars inside the precast component 4, the precast component 4 is then poured. The lifting lug 10 serves as a lifting point, allowing the precast component 4 to be easily handled and moved by lifting equipment during transportation, thus improving transportation efficiency.

[0037] Furthermore, the outer and inner walls of the precast component 4 are provided with a number of lapped steel bars 9 that are connected to the internal steel bars of the precast component 4, and the lapped steel bars 9 are connected to the binding steel bars in the foundation pit 1 later.

[0038] Specifically, such as Figure 2 As shown, in the later stages of foundation pit 1, it is generally necessary to lay reinforcing bars to form a reinforcing mesh cage that matches the size of foundation pit 1, and finally pour concrete to form a foundation structure. Precast component 4, being made of reinforced concrete, can remain in the foundation structure during the later pouring of concrete into foundation pit 1. Therefore, several lapped reinforcing bars 9 can be set on the outer wall of precast component 4 and the inner wall of the receiving cavity 5. The side of precast component 4 that contacts the side wall of foundation pit 1 does not need lapped reinforcing bars 9. The lapped reinforcing bars 9 can connect with the internal reinforcing bars of precast component 4, and can also be used later... The precast concrete is formed by drilling and anchoring the reinforcing bars. The length of the lapped reinforcing bars 9 can be 10-30cm. The external lapped reinforcing bars 9 are connected to the tied reinforcing bars in the foundation pit 1 later. Tieling reinforcing bars also need to be set in the receiving cavity 5. The internal tied reinforcing bars are connected to the internal lapped reinforcing bars 9 to form a reinforcing mesh cage that fits the receiving cavity 5. In this way, the reinforcing bars laid in the foundation pit 1 are connected to the lapped reinforcing bars 9 on the precast component 4 as one. After the concrete is poured later, the precast component 4 and the foundation structure can be completely integrated. The on-site use of the precast component 4 reduces the process of removing the precast component 4, saving time and effort. Precast component 4 can also be lifted out and reused. If the foundation pit is excavated layer by layer, before each layer is excavated, the precast component 4 can be pulled upward by the lifting equipment. This makes it easier for workers to excavate the soil layer at the bottom of the precast component 4 and reduces the risk of safety accidents. After the excavation is completed, the precast component 4 is lowered to the designated position. This process is repeated until the foundation pit is excavated to the designed depth. At this point, the height of the precast component 4 is basically consistent with the depth of the foundation pit.

[0039] Furthermore, the weight-adding material 8 is soil, water, or mud.

[0040] Specifically, in this embodiment, the weight 8 is selected as groundwater or tap water, which is convenient to be extracted from the cavity 5 later. This ensures that the cavity 5 of the precast component 4 is in a clean environment when the concrete is poured in the later stage of the foundation pit 1, and the poured concrete is easier to adhere to the inner wall of the cavity 5, resulting in better overall stability.

[0041] Furthermore, the preform 4 is provided with a cover plate 6 on top, which closes the opening of the receiving cavity 5.

[0042] Specifically, such as Figure 1As shown, the main function of the cover plate 6 is to seal the opening of the cavity 5 of the precast component 4 to prevent workers from accidentally falling in. The cover plate 6 and the precast component 4 can be connected by bolts. Normally, the cover plate 6 can keep the opening of the cavity 5 closed. When pouring concrete later, the cover plate 6 can be removed. When pumping water into the cavity 5 or pumping out the water inside, a water pump 7 can be installed on the side of the precast component. After connecting the pipeline, the cover plate 6 is opened, and the pumping pipe of the water pump 7 extends into the cavity 5. The pumping pipe does not need to extend to the bottom of the cavity 5 to pump water into the cavity 5. When pumping water, the pumping pipe can be extended to the bottom of the cavity 5. A filter screen structure is installed at the front end of the pumping pipe to prevent debris from entering the water pipe. This allows the operator to flexibly pump water into the cavity 5 or pump out the water pump 7 according to actual needs. By controlling the water level in the cavity 5, the supporting force of the precast component 4 on the side wall of the foundation pit 1 can be adjusted, thereby enhancing the overall stability of the support structure.

[0043] Furthermore, U-shaped steel bars 3 are pre-embedded on the side wall of the cavity 5 adjacent to the inner wall of the pit 1. The U-shaped steel bars 3 are distributed at intervals from top to bottom to form a ladder, and the opening of the cavity 5 allows workers to pass through.

[0044] Specifically, such as Figure 1 As shown, the ladder formed by the U-shaped steel bars 3 provides workers with a stable and safe passage to go up and down, allowing them to easily descend into the receiving cavity 5 to clean up the debris inside. The U-shaped steel bars 3 are connected to the steel reinforcement skeleton inside the precast component 4, and can also be connected to the tied steel bars when laying steel bars and pouring concrete in the receiving cavity 5 later.

[0045] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present utility model and within the spirit and principles of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A foundation pit support device without internal support, comprising a support device disposed within the foundation pit (1), characterized in that, The support device includes precast concrete components (4) that are pressed against the inner wall of the pit (1) by gravity. There is an open area between the precast components (4) that are relatively distributed in the pit (1). The precast components (4) have a cavity (5) inside. The cavity (5) is open at the top and closed at the bottom. The cavity (5) is filled with a weight-adding material (8) to increase the weight of the precast components (4).

2. The foundation pit support device without internal support according to claim 1, characterized in that, It also includes a base (2), the top surface of which is an inclined surface that slopes toward the inner wall of the pit (1). The precast component (4) is installed on the top surface of the base (2) at an inclination. The precast component (4) and the base (2) are integrally cast. The precast component (4) is pressed onto the inner wall of the pit (1) by gravity. The inner wall of the pit (1) is an inclined surface that matches the inclination of the precast component (4).

3. The foundation pit support device without internal support according to claim 2, characterized in that, The vertical cross section of the precast component (4) is wedge-shaped, and the side of the precast component (4) away from the inner wall of the pit (1) is an inclined surface.

4. A foundation pit support device without internal support according to claim 2, characterized in that, The base (2) has a number of teeth (11) distributed on its bottom surface, and the teeth (11) are serrated.

5. A foundation pit support device without internal support according to claim 3, characterized in that, The precast component (4) has lifting lugs (10) embedded on both sides of its top.

6. A foundation pit support device without internal support according to claim 1, characterized in that, The precast component (4) has several lapped steel bars (9) on its outer and inner walls that are connected to the internal steel bars of the precast component (4). The lapped steel bars (9) are connected to the binding steel bars in the foundation pit (1) later.

7. A foundation pit support device without internal support according to claim 1, characterized in that, The weight-adding material (8) is soil, water, or mud.

8. A foundation pit support device without internal support according to claim 1, characterized in that, The precast component (4) is provided with a cover plate (6) on top, which closes the opening of the receiving cavity (5).

9. A foundation pit support device without internal support according to claim 8, characterized in that, U-shaped steel bars (3) are pre-embedded on the side wall of the cavity (5) adjacent to the inner wall of the pit (1). The U-shaped steel bars (3) are distributed at intervals from top to bottom to form a ladder. The opening of the cavity (5) allows workers to pass through.

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