Foundation pit support structure based on Larsen steel sheet piles

Abstract

The utility model discloses a foundation pit support structure based on Larsen steel sheet piles, which comprises the Larsen steel sheet piles arranged in a circle along the circumferential direction of a foundation pit; the profile steel enclosing purlins are mounted on the inner sides of the Larsen steel sheet piles; the lower brackets are mounted on the inner sides of the Larsen steel sheet piles and supported on the profile steel enclosing purlins, and the lower brackets are arranged in the length direction of the profile steel enclosing purlins at intervals; the upper pressing frames are installed on the inner sides of the Larsen steel sheet piles and abut against the upper portions of the profile steel enclosing purlins in a pressing mode, and the upper pressing frames are arranged in the length direction of the profile steel enclosing purlins at intervals; and the inclined throwing support is obliquely supported on the profile steel enclosing purlin. The utility model solves the problems that the existing Larsen steel sheet pile foundation pit support structure is not strong in support force and low in load bearing capacity.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a foundation pit retaining structure based on Larssen sheet piles. Background Technology

[0002] With the increasing development of urban construction, deep foundation pit projects are becoming more and more common in urban construction. Most deep foundation pits are characterized by large excavation areas and great excavation depths. Larssen steel plates are typically installed at the edges of the foundation pit to block external soil. Diagonal bracing is installed inside the Larssen steel plates to provide support.

[0003] In the welding construction of U-shaped Larssen steel plates and diagonal braces, the actual construction connection structure is relatively simple, the connection area is small, the connection is not tight, the support force is not strong, the load-bearing capacity is limited, the requirements for manual welding quality are quite high, and in severe cases it will affect the construction quality and construction safety of the foundation pit, and the application effect is not significant.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, a foundation pit retaining structure based on Larssen sheet piles is provided to solve the problems of weak support and low load-bearing capacity of existing Larssen sheet pile foundation pit retaining structures.

[0006] To achieve the above objectives, a foundation pit retaining structure based on Larssen sheet piles is provided, comprising:

[0007] Larssen sheet piles, wherein a ring of Larssen sheet piles is arranged along the circumferential direction of the foundation pit;

[0008] A steel waler is installed on the inner side of the Larssen sheet pile;

[0009] Multiple lower brackets are installed on the inner side of the Larssen sheet pile and supported by the steel waler. The multiple lower brackets are spaced apart along the length of the steel waler.

[0010] Multiple upper pressure frames are installed on the inner side of the Larssen sheet pile and press against the upper part of the steel waler. The multiple upper pressure frames are spaced apart along the length direction of the steel waler.

[0011] The inclined brace is inclined to support the steel waler.

[0012] Furthermore, the Larssen sheet pile has alternating inner and outer grooves, with a support plate provided in the inner groove, the support plate being supported on the side of the steel waler facing the Larssen sheet pile.

[0013] Furthermore, the number of support plates is multiple, and the multiple support plates are spaced apart along the length direction of the inner groove.

[0014] Furthermore, the steel waler is an H-beam.

[0015] Furthermore, the lower bracket includes:

[0016] A lower cantilever rod supported by the steel waler, one end of which is connected to the inner side of the Larssen sheet pile;

[0017] An inclined lower support rod is provided, with its upper end connected to the other end of the lower cantilever rod and its lower end connected to the inner side of the Larssen sheet pile.

[0018] Furthermore, the upper pressure frame includes:

[0019] An upper cantilever rod is pressed against the upper part of the steel waler, and one end of the upper cantilever rod is connected to the inner side of the Larssen steel sheet pile;

[0020] An inclined upper support rod is provided, the lower end of which is connected to the other end of the upper cantilever rod, and the upper end of which is connected to the inner side of the Larssen sheet pile.

[0021] The beneficial effects of this utility model are as follows: the foundation pit retaining structure based on Larssen sheet piles forms an upper-pressure, lower-bearing structure by setting a lower pressure frame and an upper support frame above and below the steel waler set inside the Larssen sheet piles, respectively, to support the steel waler and stabilize the area around the waler. This upper-pressure, lower-bearing structure integrates the steel waler, the inclined bracing, and the Larssen sheet piles into a single unit, improving the supporting force and load-bearing capacity of the foundation pit retaining structure. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the foundation pit retaining structure based on Larssen sheet piles, according to an embodiment of this utility model.

[0024] Figure 2 This is a schematic diagram of the connection between the Larssen sheet pile and the steel waler in an embodiment of this utility model. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Reference Figure 1 and Figure 2 As shown, this utility model provides a foundation pit retaining structure based on Larssen sheet piles, including: Larssen sheet piles 1, steel walers 2, lower support frame 3, upper pressure frame 4, and inclined bracing 5.

[0028] In this embodiment, the Larssen sheet pile 1 is a U-shaped Larssen sheet pile. The Larssen sheet pile 1 has multiple inner grooves a and multiple outer grooves b. The inner grooves a and outer grooves b are arranged alternately. The Larssen sheet pile 1 is arranged in a circle along the circumferential direction of the foundation pit.

[0029] The steel waler 2 is installed on the inside of the Larssen sheet pile 1.

[0030] There are multiple lower brackets 3. The lower brackets 3 are installed on the inner side of the Larssen sheet piles 1 and supported by the steel walers 2. Multiple lower brackets 3 are spaced apart along the length of the steel walers 2.

[0031] There are multiple upper pressure frames 4. The upper pressure frames 4 are installed inside the Larssen sheet piles 1 and press against the upper part of the steel waler 2. Multiple upper pressure frames 4 are spaced apart along the length of the steel waler 2.

[0032] The inclined brace 5 is inclined to support the steel waler 2.

[0033] In a preferred embodiment, a support plate 6 is provided in the recessed groove a. The support plate 6 is supported on the side of the steel waler 2 facing the Larssen sheet pile 1.

[0034] There are multiple support plates 6. The multiple support plates 6 are spaced apart along the length of the inner groove a.

[0035] In this embodiment, the number of support plates is greater than or equal to 5. Multiple support plates 6 are arranged at equal intervals along the length of the inner groove a.

[0036] In this embodiment, the steel waler 2 is an H-beam. Specifically, one flange of the H-beam is welded to the inside of the Larssen sheet pile, and the other flange of the H-beam is welded to the upper end of the inclined brace.

[0037] In a preferred embodiment, the lower bracket 3 includes a lower cantilever rod 31 and a lower support rod 32.

[0038] The lower cantilever rod 31 is supported by the steel waler 2. One end of the lower cantilever rod 31 is connected to the inside of the Larssen sheet pile 1.

[0039] The lower strut 32 is inclined. The lower strut is located below the steel waler. The upper end of the lower strut 32 is connected to the other end of the lower cantilever 31. The lower end of the lower strut 32 is connected to the inside of the Larssen sheet pile 1.

[0040] In a preferred embodiment, the upper pressure frame 4 includes an upper cantilever rod 41 and an upper support rod 42.

[0041] The upper cantilever rod 41 presses against the upper part of the steel waler 2. One end of the upper cantilever rod 41 is connected to the inside of the Larssen sheet pile 1.

[0042] The upper strut 42 is inclined. The upper strut is positioned above the steel waler. The lower end of the upper strut 42 is connected to the other end of the upper cantilever 41. The upper end of the upper strut 42 is connected to the inner side of the Larssen sheet pile 1.

[0043] In this embodiment, the lower bracket and the upper pressure frame are both made of H-beams.

[0044] The present invention relates to a foundation pit retaining structure based on Larssen sheet piles. First, the upper-pressure and lower-bearing structure is welded to the Larssen sheet piles on one side every 2.4 meters to support the waler. Then, the flanges of the steel waler are welded to the Larssen sheet piles with equal strength to reduce the load on the Larssen sheet piles. Finally, the steel waler and the inclined bracing are fully welded on both sides.

[0045] In the specific implementation of this utility model's foundation pit retaining structure based on Larssen sheet piles, U-shaped Larssen sheet piles (with lower supports and upper pressure frames already installed) are first placed in the foundation pit. Then, steel walers are welded to the corresponding positions of the U-shaped Larssen sheet piles (between the lower supports and upper pressure frames). The gaps between the steel walers and the inner grooves of the Larssen sheet piles are filled with support plates. Three stiffening plates are added to the steel walers, with their positions corresponding to the positions of the support plates. Finally, the inclined bracing is fully welded to the steel walers on both sides.

[0046] This utility model discloses a foundation pit retaining structure based on Larssen sheet piles. It utilizes a lower support frame and an upper bracket, respectively, installed above and below a steel waler set inside the Larssen sheet piles, to form an upper-pressing, lower-bearing structure that supports and stabilizes the surrounding area of ​​the steel waler. This upper-pressing, lower-bearing structure integrates the steel waler, the inclined bracing, and the Larssen sheet piles into a single unit, improving the supporting force and load-bearing capacity of the foundation pit retaining structure.

[0047] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A laison steel sheet pile based excavation enclosure, characterized in that, include: Larssen sheet piles, wherein a ring of Larssen sheet piles is arranged along the circumferential direction of the foundation pit; A steel waler is installed on the inner side of the Larssen sheet pile; Multiple lower brackets are installed on the inner side of the Larssen sheet pile and supported by the steel waler. The multiple lower brackets are spaced apart along the length of the steel waler. Multiple upper pressure frames are installed on the inner side of the Larssen sheet pile and press against the upper part of the steel waler. The multiple upper pressure frames are spaced apart along the length direction of the steel waler. The inclined brace is inclined to support the steel waler.

2. The Larssen steel sheet pile based excavation enclosure according to claim 1, characterized in that, The Larssen sheet pile has alternating inner and outer grooves, with a support plate in the inner groove. The support plate is supported on the side of the steel waler facing the Larssen sheet pile.

3. A Larssen steel sheet piling based excavation enclosure according to claim 2, characterised in that, The number of support plates is multiple, and the multiple support plates are spaced apart along the length direction of the inner groove.

4. The Larssen steel sheet pile based excavation enclosure of claim 1, wherein, The steel waler is an H-beam.

5. The Larssen steel sheet pile based excavation enclosure according to claim 1, characterized in that, The lower bracket includes: A lower cantilever rod supported by the steel waler, one end of which is connected to the inner side of the Larssen sheet pile; An inclined lower support rod is provided, with its upper end connected to the other end of the lower cantilever rod and its lower end connected to the inner side of the Larssen sheet pile.

6. The Larssen steel sheet pile based excavation enclosure of claim 1, wherein, The upper pressure frame includes: An upper cantilever rod is pressed against the upper part of the steel waler, and one end of the upper cantilever rod is connected to the inner side of the Larssen steel sheet pile; An inclined upper support rod is provided, the lower end of which is connected to the other end of the upper cantilever rod, and the upper end of which is connected to the inner side of the Larssen sheet pile.

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