Deep foundation pit free support tensile steel sheet pile supporting structure

Abstract

The utility model provides a kind of deep foundation pit exempt from supporting Larsen steel sheet pile supporting structure, it is related to foundation pit supporting engineering technical field, the structure includes Larsen steel sheet pile, it is arranged in polygonal;Polygonal enclosing purlin is set to the inboard of Larsen steel sheet pile;Suspension assembly connects polygonal enclosing purlin and Larsen steel sheet pile.Construction method includes: to construction site is flattened and handled;Annular groove is excavated around foundation pit;Polygonal enclosing purlin is assembled in groove;Using polygonal enclosing purlin as guide frame, and setting polygonal Larsen steel sheet pile;Polygonal enclosing purlin and polygonal Larsen steel sheet pile are connected using suspension assembly;Excavate deep foundation pit earthwork, construction internal structure;And after the construction of structure is completed, backfill the earthwork between structure and supporting structure;S7: remove the connection between polygonal enclosing purlin and polygonal Larsen steel sheet pile, pull out polygonal Larsen steel sheet pile and remove polygonal enclosing purlin.The utility model can reach the safety and stability of structure foundation pit without adding internal support.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support engineering technology, and in particular to a deep foundation pit unsupported Larssen sheet pile support structure. Background Technology

[0002] Larssen sheet piles are widely used in building construction, municipal engineering and water conservancy projects, especially in the construction of factory structures (pump rooms and fire stations). They are a continuous and tight foundation pit support structure formed by a reliable interlocking connection.

[0003] Larssen sheet piles are mainly used for retaining soil and waterproofing during the construction of foundation pits, ensuring the stability of the foundation pit during excavation, preventing the slope from becoming unstable and collapsing, and avoiding casualties and economic losses.

[0004] The conventional engineering structure foundation pit support structure is rectangular in shape and often adopts a steel sheet pile plus internal bracing scheme. The Larssen steel sheet piles are constructed first, followed by earthwork excavation, construction of internal bracing, and subsequent earthwork excavation to the excavation elevation. The foundation slab of the structure is constructed, and the walls are constructed to a certain distance from the bottom of the internal bracing before the bracing is replaced. The internal bracing is then removed, and the remaining walls and top slab are constructed.

[0005] The applicant has discovered that the prior art has at least the following technical problems:

[0006] Because of the internal supports, internal support and replacement work are required, and an additional horizontal construction joint needs to be added to the wall structure. Therefore, the construction period is longer and the cost is higher.

[0007] Therefore, there is an urgent need for a deep foundation pit unsupported Larssen sheet pile support structure to solve the above-mentioned technical problems. Utility Model Content

[0008] The purpose of this utility model is to provide a deep foundation pit support structure using Larssen sheet piles without internal bracing. By combining polygonal Larssen sheet piles with polygonal steel walers for support, the structure's foundation pit can be kept safe and stable without additional internal bracing. The various technical effects of the preferred technical solutions provided by this utility model are detailed below.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] This utility model provides a deep foundation pit unsupported Larssen sheet pile support structure, comprising:

[0011] Larssen sheet piles are arranged in a polygonal pattern to form the outer structure of the foundation pit support;

[0012] A polygonal waler is installed on the inner side of the Larssen sheet pile and can also serve as a construction guide for the Larssen sheet pile.

[0013] A suspension assembly for connecting the polygonal waler to the Larssen sheet piles.

[0014] Preferably, the polygonal waler is composed of multiple steel walers connected together, and each steel waler has a sealing plate at its end, with adjacent steel walers connected by the sealing plate.

[0015] Preferably, each of the steel walers is provided with a rib at its end, and the rib is welded to the steel waler to enhance the end structural strength of the steel waler.

[0016] Preferably, the suspension assembly includes:

[0017] The hanger includes a horizontal plate and a vertical plate that are fixedly connected, the horizontal plate being fixed to the Larssen sheet pile;

[0018] A connecting plate is used to connect the upright plate and the rib plate.

[0019] Preferably, the horizontal plate and the vertical plate form a "T" shape.

[0020] Preferably, the hanger is made of steel.

[0021] Preferably, the steel walers, the uprights, and the ribs are all connected by a detachable connection structure.

[0022] Preferably, bolt holes are provided on the sealing plate, the upright plate, and the rib plate, and the connecting structure includes bolts.

[0023] Preferably, the polygonal waler is a closed ring structure, the shape of which matches the cross-sectional shape of the foundation pit.

[0024] This utility model provides a deep foundation pit support structure without support using Larssen steel sheet piles. ， The system includes Larssen sheet piles, polygonal walers, and suspension components. The Larssen sheet piles are arranged in polygonal patterns to form the outer structure of the foundation pit support. The polygonal walers, located inside the Larssen sheet piles, also serve as construction guides for the sheet piles. The suspension components connect the polygonal walers to the Larssen sheet piles. By using the polygonal walers as guides for the sheet piles, the cost of using guides can be saved. This deep foundation pit support structure, which requires no additional internal bracing, achieves the safety and stability of the foundation pit without the need for internal bracing. After the support structure is completed, excavation is convenient, and the support structure can be dismantled after the construction of the structure and backfilling are completed, eliminating the need for replacement supports and significantly shortening the overall construction period. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of an embodiment of the unsupported Larssen sheet pile support structure for deep foundation pits according to this utility model;

[0027] Figure 2 yes Figure 1 Schematic diagram of node ① in the middle;

[0028] Figure 3 yes Figure 2 Schematic diagram of section 1-1;

[0029] Figure 4 yes Figure 2 Schematic diagram of section 2-2;

[0030] Figure 5 This is a schematic diagram of the suspension component in the unsupported Larssen sheet pile support structure for deep foundation pits of this utility model;

[0031] Figure 6 This is a structural schematic diagram of the steel hanger in the suspension assembly;

[0032] Figure 7 yes Figure 6 A schematic diagram of the left-side view structure.

[0033] In the diagram: 1. Larssen sheet pile; 2. Steel waler; 3. Rib plate; 4. Sealing plate; 5. Bolt; 6. Bolt hole; 7. Polygonal waler; 8. Hanger; 9. Connecting plate; 10. Horizontal plate; 11. Vertical plate. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] Figure 1 This is a structural schematic diagram of this embodiment, as shown below. Figure 1As shown, this embodiment provides a deep foundation pit unsupported Larssen sheet pile support structure, including: Larssen sheet piles 1, polygonal walers 7, and suspension components.

[0036] The Larssen sheet piles 1 are arranged in a polygonal pattern to form the outer structure of the foundation pit support. Polygonal walers 7 are located inside the Larssen sheet piles 1 and serve as a construction guide for the Larssen sheet piles 1. A suspension assembly is used to connect the polygonal walers 7 to the Larssen sheet piles 1. In this embodiment, the polygonal walers 7 are closed annular structures, and their shape matches the cross-sectional shape of the foundation pit.

[0037] This deep foundation pit unsupported Larssen sheet pile support structure saves on guide frame usage costs by using polygonal walers 7 as guides for the Larssen sheet piles. Furthermore, this deep foundation pit unsupported Larssen sheet pile support structure, through the combination of polygonal Larssen sheet piles and polygonal steel walers, achieves the effect of ensuring the safety and stability of the foundation pit without the need for internal supports. After the support structure is constructed, excavation is convenient, and the support structure can be dismantled after the structure construction and backfilling are completed, eliminating the need for support replacement and significantly shortening the overall construction period.

[0038] As an optional implementation method, such as Figures 2-4 As shown, the polygonal waler 7 in this embodiment is composed of multiple steel walers 2 connected together. Each steel waler 2 has a sealing plate 4 at its end, and two adjacent steel walers 2 are connected by the sealing plate 4.

[0039] Specifically, in this embodiment, each steel waler 2 is provided with a sealing plate 4 at its end, and the sealing plate 4 is welded to the steel waler 2, and bolt holes 6 are reserved in the sealing plate 4.

[0040] In this embodiment, each steel waler 2 is provided with a rib plate 3 at its end. The rib plate 3 is welded to the steel waler 2 to enhance the end structural strength of the steel waler 2 and ensure safe and stable construction.

[0041] As an optional implementation method, such as Figures 5-7 As shown, the suspension assembly in this embodiment includes a hanger 8 and a connecting plate 9.

[0042] The hanger 8 includes a horizontal plate 10 and a vertical plate 11 that are fixedly connected. The horizontal plate 10 is fixed to the Larssen sheet pile 1. The connecting plate 9 is used to connect the vertical plate 11 and the rib plate 3.

[0043] Specifically, in this embodiment, the horizontal plate 10 and the vertical plate 11 form a "T" shape. The hanger 8 is made of steel.

[0044] As an optional implementation, for ease of construction and disassembly, in this embodiment, the multiple steel walers 2 and the vertical plate 11 and the rib plate 3 are all connected by a detachable connection structure.

[0045] Specifically, bolt holes are pre-drilled on the sealing plate 4, the upright plate 11, and the rib plate 3, and the connecting structure includes bolts 5.

[0046] A construction method for the above-mentioned deep foundation pit unsupported Larssen sheet pile support structure includes the following steps:

[0047] S1: Level the construction site;

[0048] While leveling the construction site, or before that, according to Figures 2-4 In this embodiment, a steel waler 2 is fabricated. The end of the steel waler 2 is provided with a rib plate 3, and the rib plate 3 is welded to the steel waler 2. A sealing plate 4 is provided at the end of the steel waler 2, and the sealing plate 4 is welded to the steel waler 2. The sealing plate 4 is provided with bolt holes 6 so that it can be connected by high-strength bolts in the subsequent construction process.

[0049] S2: Excavate a ring trench around the foundation pit;

[0050] In this embodiment, an annular trench is excavated according to the position of the polygonal waler 7.

[0051] S3: Assemble the polygonal waler 7 within the trench;

[0052] In this embodiment, the polygonal waler 7 is made of multiple steel walers 2 connected by high-strength bolts 5;

[0053] S4: Using the polygonal waler 7 as a guide frame, the polygonal Larssen sheet pile 1 is constructed;

[0054] S5: The polygonal waler 7 and the polygonal Larssen sheet pile 1 are connected by a suspension assembly;

[0055] Before this step, it is necessary to first determine... Figure 6 and Figure 7 Steel hangers 8 are made by welding horizontal plates 10 and vertical plates 11. Steel hangers 8 are set at both ends of each steel waler 2. After the deep foundation pit is excavated, the steel walers 2 are suspended by the steel hangers 8. The two ends of each steel waler 2 are connected to the steel hangers 8 welded to the Larssen steel sheet piles 1 by connecting plates 9 and the ribs 3 on the steel walers 2 with high-strength bolts 5.

[0056] S6: Excavate the deep foundation pit and construct the internal structures; and after the construction of the structures is completed, backfill the soil between the structures and the support structure.

[0057] S7: Remove the connection between the polygonal waler 7 and the polygonal Larssen sheet pile 1, pull out the polygonal Larssen sheet pile 1 and remove the polygonal waler 7.

[0058] In this embodiment, after removing the connecting plate 9, the polygonal Larssen sheet pile 1 can be pulled out using special equipment, and then the polygonal waler 7 can be removed to complete the construction of the deep foundation pit unsupported Larssen sheet pile support structure.

[0059] Using polygonal steel walers as guide frames for Larssen sheet piles can save on guide frame usage costs. This method does not require internal supports, and excavation is convenient after the support structure is completed. The support structure can be dismantled after the structure is completed and the backfilling is finished, eliminating the need for support replacement and significantly shortening the overall construction period.

[0060] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A deep foundation pit unsupported Larssen sheet pile support structure, characterized in that, include: Larssen sheet piles are arranged in a polygonal pattern to form the outer structure of the foundation pit support; A polygonal waler is installed on the inner side of the Larssen sheet pile and can also serve as a construction guide for the Larssen sheet pile. A suspension assembly for connecting the polygonal waler to the Larssen sheet piles.

2. The deep foundation pit unsupported Larssen sheet pile support structure according to claim 1, characterized in that, The polygonal waler is composed of multiple steel walers connected together, and each steel waler has a sealing plate at its end. Adjacent steel walers are connected through the sealing plate.

3. The deep foundation pit unsupported Larssen sheet pile support structure according to claim 2, characterized in that, Each of the steel walers has a rib plate at its end, which is welded to the steel waler to enhance the end structural strength of the steel waler.

4. The deep foundation pit unsupported Larssen sheet pile support structure according to claim 3, characterized in that, The suspension assembly includes: The hanger includes a horizontal plate and a vertical plate that are fixedly connected, the horizontal plate being fixed to the Larssen sheet pile; A connecting plate is used to connect the upright plate and the rib plate.

5. The deep foundation pit unsupported Larssen sheet pile support structure according to claim 4, characterized in that: The horizontal plate and the vertical plate form a "T" shape.

6. The deep foundation pit unsupported Larssen sheet pile support structure according to claim 4 or 5, characterized in that: The hanger is made of steel.

7. The deep foundation pit unsupported Larssen sheet pile support structure according to claim 4, characterized in that: The steel walers, the uprights, and the ribs are all connected by a detachable connection structure.

8. The deep foundation pit unsupported Larssen sheet pile support structure according to claim 7, characterized in that: Bolt holes are pre-drilled on the sealing plate, the upright plate, and the rib plate, and the connecting structure includes bolts.

9. The deep foundation pit unsupported Larssen sheet pile support structure according to any one of claims 1-5, characterized in that: The polygonal waler is a closed ring structure, and its shape matches the cross-sectional shape of the foundation pit.

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