Lassen steel sheet pile and concrete formwork structure

Abstract

A Larsen steel sheet pile and concrete formwork structure is arranged in a foundation pit and comprises a Larsen steel sheet pile, a formwork inner plate layer, a clamping piece and a sealing device. The Larsen steel sheet piles are arranged along the side face of the foundation pit, and the lower ends of the Larsen steel sheet piles are inserted into soil at the bottom of the foundation pit. A gap is reserved between the Larsen steel sheet pile and a foundation to be constructed; the formwork inner plate layer is arranged on the inner side of the Larsen steel sheet pile, and the height of the formwork inner plate layer is matched with the height of a foundation to be constructed; a limiting piece is arranged at the bottom of the inner side of the formwork inner plate layer; the clamping pieces are arranged on the formwork inner plate layer at intervals along the vertical edges and the top edge of the two sides of the formwork inner plate layer, and the formwork inner plate layer and the Larsen steel sheet pile are connected together. And the sealing device is arranged at the joint of the Larsen steel sheet pile and the template inner plate layer. The utility model solves the technical problems that the construction efficiency is lower, the material loss is higher, the construction complexity is increased and the cost is higher in the traditional building and dismantling process of the foundation template.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to a Larssen steel sheet pile that also serves as a concrete formwork structure. Background Technology

[0002] For foundation engineering projects under complex geological conditions, using Larssen sheet piles as the foundation pit support structure offers advantages such as ease of operation, high construction efficiency, and high safety. However, in traditional construction, concrete formwork and support structures usually need to be set up separately. This leads to low construction efficiency and high material loss during the erection and dismantling of foundation formwork, increasing both construction complexity and cost. While Larssen sheet piles, as a commonly used temporary support structure for foundation support, possess good load-bearing capacity and durability, their application in formwork construction is not widespread. Therefore, developing a Larssen sheet pile structure that can also serve as concrete formwork, simplifying construction and improving structural stability, is of great significance. Utility Model Content

[0003] The purpose of this utility model is to provide a Larssen steel sheet pile that can also be used as a concrete formwork structure, in order to solve the technical problems of low construction efficiency and high material loss in the traditional foundation formwork erection and dismantling process, which increases the complexity of construction and brings high costs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] A Larssen sheet pile structure, also serving as a concrete formwork structure, is installed in an excavation pit. It includes Larssen sheet piles, an inner formwork slab, clamping components, and a sealing device. The Larssen sheet piles are installed along the sides of the excavation pit, with their lower ends inserted into the soil at the bottom of the pit. A gap is maintained between the Larssen sheet piles and the foundation to be constructed. The inner formwork slab is located inside the Larssen sheet piles, and its height is adapted to the height of the foundation to be constructed. A limiting component is installed at the bottom inner side of the inner formwork slab. A set of clamping components is arranged at intervals along the vertical sides and top edge of the inner formwork slab, connecting it to the Larssen sheet piles. The sealing device is located at the joint between the Larssen sheet piles and the inner formwork slab to seal the joint.

[0006] Preferably, the distance between the Larssen sheet pile and the outer edge of the foundation to be poured is 80mm~120mm.

[0007] Preferably, the inner panel of the template is made of spliced ​​extruded polystyrene boards, and adjacent extruded polystyrene boards are bonded together; an anti-corrosion layer is provided on the inner side of the inner panel of the template; the anti-corrosion layer is made of epoxy resin or acrylic coating.

[0008] Preferably, the limiting member is a set of limiting rods; the set of limiting rods are arranged at intervals along the bottom edge of the inner plate of the template, the lower end of the limiting rod is inserted into the soil at the bottom of the foundation pit, and the upper end of the limiting rod is pressed against the inner side of the inner plate of the template.

[0009] Preferably, the limiting member is a concrete stop bar; the concrete stop bar is set along the bottom edge of the Larssen sheet pile, and the bottom of the concrete stop bar is buried in the soil at the bottom of the foundation pit, while the upper part of the concrete stop bar presses on the inner side of the Larssen sheet pile; a strip-shaped notch is provided at the top of the concrete stop bar, on the side close to the Larssen sheet pile; the inner plate of the template is installed on top of the concrete stop bar, and the inner side of the inner plate of the template is vertically flush with the inner side of the concrete stop bar; a protruding strip is provided at the bottom of the inner plate of the template, corresponding to the position of the strip-shaped notch; the protruding strip is inserted into the strip-shaped notch.

[0010] Preferably, the clamping member includes a connecting rod and a pressure plate; the connecting rod is vertically welded to the Larssen sheet pile near the inner plate layer of the template, and has external threads; the pressure plate is elongated, and has a threaded sleeve on one side; the threaded sleeve is threaded to the connecting rod, and the pressure plate presses against the inner side of the inner plate layer of the template.

[0011] Compared with the prior art, the present invention has the following features and beneficial effects.

[0012] 1. This utility model is compatible with (deep) foundation pit engineering and foundation engineering. It can be used as a support structure for foundation pit engineering and as a formwork for foundation engineering, reducing the formwork erection and dismantling process and improving construction efficiency. At the same time, Larssen steel sheet piles can be reused repeatedly after demolding, reducing material loss during demolding. As both a foundation pit support structure and a concrete construction formwork, it has good economic benefits.

[0013] 2. The Larssen steel sheet pile of this utility model generates less waste during use, reducing environmental pollution at the construction site and having good social benefits. By integrating the Larssen steel sheet pile with the concrete formwork, the trouble of separate construction of formwork support and support structure in traditional construction is reduced, simplifying the operation process and shortening the construction cycle.

[0014] 3. Improved safety and stability: The combined structure of Larssen sheet piles and inner formwork layers provides higher compressive and bending resistance, enhances the overall stability of the structure, prevents formwork displacement or deformation, and ensures safety during construction.

[0015] 4. This utility model uses specially designed clamping components to firmly connect the Larssen steel sheet piles to the inner plate of the formwork, ensuring the stability of both during construction. During installation, after the inner plate of the formwork is bonded to the Larssen steel sheet piles, the pressure plate can be pressed onto the inner plate of the formwork by rotating around the connecting rod. It has the characteristics of quick installation and disassembly, reducing the construction cycle. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the planar structure of the Larssen sheet pile that also serves as a concrete formwork structure according to this utility model.

[0018] Figure 2 This is a schematic diagram of the Larssen sheet pile, which serves as a concrete formwork structure and is installed in the foundation pit according to this utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the template inner plate layer with a limiting rod at the bottom.

[0020] Figure 4 This is a schematic diagram of the structure of the inner plate layer of the template with concrete retaining strips at the bottom.

[0021] Figure 5 This is a schematic diagram of the clamping component in this utility model.

[0022] Attached reference numerals: 1-Larsen sheet pile, 2-Inner slab of formwork, 3-Foundation, 4-Foundation pit, 5-Clamping component, 5.1-Connecting rod, 5.2-Pressure plate, 5.3-Threaded sleeve, 6-Sealing device, 7-Anti-corrosion layer, 8-Limiting rod, 9-Concrete retaining strip, 10-Strip notch, 11-Protruding strip, 12-Lifting cable. Detailed Implementation

[0023] In a construction project, the Larssen sheet piles of this utility model were used as both formwork and concrete template. The Larssen sheet piles, according to design requirements, served as the formwork for the foundation concrete and the foundation pit support system. These were then supplemented with extruded polystyrene (XPS) boards to form a complete foundation template and foundation pit support system. After the foundation pit support system was constructed, earthmoving machinery was used to excavate the pit, followed by reinforcement and concrete construction. By using the integrated Larssen sheet pile and concrete template system, the construction team reduced the time spent on template installation and dismantling, shortening the construction period by approximately 15%. Furthermore, due to the reuse of the Larssen sheet piles, the project saved approximately 10% in material costs, and the overall construction quality was significantly improved.

[0024] like Figure 1-5As shown, this Larssen sheet pile structure, which also serves as a concrete formwork, is installed in the foundation pit 4. It includes Larssen sheet piles 1, an inner formwork layer 2, clamping components 5, and a sealing device 6. The Larssen sheet piles 1 are installed along the side of the foundation pit 4, with their lower ends inserted into the soil at the bottom of the pit. The Larssen sheet piles 1 are 9m long, type IV, and a gap is left between them and the foundation 3 to be constructed. The inner formwork layer 2 is located inside the Larssen sheet piles 1, and its height is adapted to the height of the foundation 3 to be constructed. A limiting component is installed at the bottom of the inner formwork layer 2. A set of clamping components 5 is arranged at intervals along the vertical sides and top edge of the inner formwork layer 2, connecting it to the Larssen sheet piles 1. The sealing device 6 is installed at the joint between the Larssen sheet piles 1 and the inner formwork layer 2 to seal the joint.

[0025] In this embodiment, the inner plate layer 2 of the template is made of extruded polystyrene boards spliced ​​together, and adjacent extruded polystyrene boards are bonded together; the extruded polystyrene boards are bonded to the Larssen steel sheet piles 1 by spot bonding; an anti-corrosion layer 7 is provided on the inner side of the inner plate layer 2 of the template; the anti-corrosion layer 7 is made of epoxy resin or acrylic coating.

[0026] In this embodiment, the distance between the Larssen sheet pile 1 and the outer edge of the foundation 3 to be poured is 80mm~120mm to facilitate the binding of reinforcing bars and the insertion of extruded polystyrene board. The extruded polystyrene board is 50mm thick as an isolation layer to ensure that the edge of the foundation 3 is straight after pouring.

[0027] In this embodiment, the limiting component is a set of limiting rods 8; the set of limiting rods 8 are arranged at intervals along the bottom edge of the inner plate layer 2 of the template, the lower end of the limiting rods 8 is inserted into the soil at the bottom of the foundation pit 4, and the upper end of the limiting rods 8 is pressed against the inner side surface of the inner plate layer 2 of the template.

[0028] In this embodiment, the limiting component is a concrete retaining strip 9; the concrete retaining strip 9 is set along the bottom edge of the Larssen sheet pile 1, and the bottom of the concrete retaining strip 9 is buried in the soil at the bottom of the foundation pit 4, and the upper part of the concrete retaining strip 9 presses on the inner side of the Larssen sheet pile 1; a strip-shaped notch 10 is provided at the top of the concrete retaining strip 9, near the Larssen sheet pile 1; the inner plate layer 2 of the template is installed on the top of the concrete retaining strip 9, and the inner side of the inner plate layer 2 of the template is vertically flush with the inner side of the concrete retaining strip 9; a protruding strip 11 is provided at the bottom of the inner plate layer 2 of the template, corresponding to the position of the strip-shaped notch 10; the protruding strip 11 is inserted into the strip-shaped notch 10.

[0029] In this embodiment, the clamping member 5 includes a connecting rod 5.1 and a pressure plate 5.2; the connecting rod 5.1 is vertically welded to the Larssen sheet pile 1 near the inner plate layer 2 of the template, and has external threads; the pressure plate 5.2 is elongated, and a threaded sleeve 5.3 is provided on one side of the pressure plate 5.2; the threaded sleeve 5.3 is threadedly connected to the connecting rod 5.1, and the pressure plate 5.2 is pressed against the inner side of the inner plate layer 2 of the template.

[0030] In this embodiment, the sealing device 6 uses foam rubber strips or ethylene propylene diene monomer rubber strips. The sealing device 6 prevents concrete leakage and ensures the stability of the formwork, preventing excessive external pressure from causing the formwork to fall off.

[0031] In this embodiment, a lifting ring is provided at the top of the Larssen sheet pile 1. The lifting ring is connected to the lifting cable 12, which is made of steel wire rope with a diameter of 12.5mm. One end of the steel wire rope is connected to the lifting ring of the Larssen sheet pile 1, and the other end of the steel wire rope is connected to the hook of the truck crane.

[0032] The installation method of this utility model is as follows.

[0033] Step 1: First, carry out the first step of earthwork excavation, raising the overall site elevation from -1.00m to -1.50m. The side of the excavated pit is longer than the side of the foundation 3 to be constructed. Then, mark the positioning lines for Larssen sheet piles 1, leaving a gap between the positioning lines and the foundation to be constructed. Then, use a pile driver to install Larssen sheet piles 1. After the Larssen sheet piles 1 are inserted, carry out the second step of earthwork excavation, starting from the current elevation and excavating the structural foundation area. After excavating the soil layer to the bottom elevation of foundation 3, the Larssen sheet piles 1 also serve as concrete formwork for installation.

[0034] Step 2: After the foundation pit support system is completed, proceed with the reinforcement binding, extruded polystyrene board insertion, and concrete construction. The extruded polystyrene board must be inserted after the foundation reinforcement binding is completed.

[0035] Step 3: After the concrete is accepted, the concrete pouring personnel will carry out the concrete pouring operation. After the concrete reaches the demolding strength, earthmoving machinery will be used to backfill the foundation pit 4. After the backfilling reaches the designated elevation, 12 slings and pile drivers will be used to remove the Larssen steel sheet piles 1 and put them into use in the next section.

[0036] The above embodiments are not exhaustive examples of specific implementation methods, and other embodiments may also exist. The purpose of the above embodiments is to illustrate the present utility model, rather than to limit the protection scope of the present utility model. All applications derived from simple variations of the present utility model fall within the protection scope of the present utility model.

Claims

1. A Larssen sheet pile structure that also serves as a concrete formwork structure, installed in an excavation pit (4), characterized in that: The system includes Larssen sheet piles (1), inner formwork slabs (2), clamping components (5), and sealing devices (6). The Larssen sheet piles (1) are set along the side of the foundation pit (4), with the lower end of the Larssen sheet piles (1) inserted into the soil at the bottom of the foundation pit (4). A gap is left between the Larssen sheet piles (1) and the foundation (3) to be constructed. The inner formwork slabs (2) are set inside the Larssen sheet piles (1), and the height of the inner formwork slabs (2) is adapted to the height of the foundation (3) to be constructed. Limiting components are set at the bottom of the inner formwork slabs (2). There is a set of clamping components (5), which are arranged at intervals along the two vertical sides and the top side of the inner formwork slabs (2) to connect the inner formwork slabs (2) and the Larssen sheet piles (1). The sealing device (6) is set at the joint between the Larssen sheet piles (1) and the inner formwork slabs (2) to seal the joint.

2. The Larssen sheet pile structure used as a concrete formwork as described in claim 1, characterized in that: The distance between the Larsen sheet pile (1) and the outer edge of the foundation (3) to be poured is 80mm~120mm.

3. The Larssen sheet pile structure used as a concrete formwork as described in claim 1, characterized in that: The inner panel (2) of the template is made of extruded polystyrene boards spliced ​​together, and adjacent extruded polystyrene boards are bonded together; an anti-corrosion layer (7) is provided on the inner side of the inner panel (2); the anti-corrosion layer (7) is made of epoxy resin or acrylic coating.

4. The Larssen sheet pile structure used as a concrete formwork as described in claim 1, characterized in that: The limiting component is a set of limiting rods (8); a set of limiting rods (8) are arranged at intervals along the bottom edge of the inner plate layer (2) of the template, the lower end of the limiting rod (8) is inserted into the soil at the bottom of the foundation pit (4), and the upper end of the limiting rod (8) is pressed against the inner side of the inner plate layer (2) of the template.

5. The Larssen sheet pile structure used as a concrete formwork as described in claim 1, characterized in that: The limiting component is a concrete retaining strip (9); the concrete retaining strip (9) is set along the bottom edge of the Larssen sheet pile (1), and the bottom of the concrete retaining strip (9) is buried in the soil at the bottom of the foundation pit (4), and the upper part of the concrete retaining strip (9) presses on the inner side of the Larssen sheet pile (1); a strip notch (10) is provided on the top of the concrete retaining strip (9) and on the side close to the Larssen sheet pile (1); the inner plate layer (2) of the template is installed on the top of the concrete retaining strip (9), and the inner side of the inner plate layer (2) is vertically flush with the inner side of the concrete retaining strip (9); a protrusion (11) is provided at the bottom of the inner plate layer (2) and at the position corresponding to the strip notch (10); the protrusion (11) is inserted into the strip notch (10).

6. The Larssen sheet pile structure used as a concrete formwork as described in claim 1, characterized in that: The clamping member (5) includes a connecting rod (5.1) and a pressure plate (5.2); the connecting rod (5.1) is vertically welded to the Larssen sheet pile (1) near the inner plate layer (2) of the template, and has an external thread; the pressure plate (5.2) is long and has a threaded sleeve (5.3) on one side; the threaded sleeve (5.3) is threaded to the connecting rod (5.1), and the pressure plate (5.2) is pressed against the inner side of the inner plate layer (2) of the template.

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