A mixed arrangement type building foundation pit retaining wall

Abstract

This utility model discloses a hybrid arrangement retaining wall for building foundation pits, belonging to the field of foundation pit protection technology. It includes: multiple sets of retaining steel plate structures and steel column pile structures; the retaining steel plate structure comprises multiple sets of spliced ​​metal plates, and the steel column pile structure comprises a columnar main body and a bottom breaking-through tip; the metal plates are connected to each other and to the columnar main body via connecting structures; a supporting structure is also provided on the outside of the columnar main body. This utility model alternately connects the retaining steel plate structure and the steel column pile structure, then uses the supporting structure to support the steel column pile structure to prevent it from tilting, and then uses the steel column pile structure to support the retaining steel plate structures on both sides, improving the overall strength of the retaining wall. The retaining steel plate structure and the steel column pile structure are spliced ​​together via connecting structures, which not only facilitates connection but also mutually restricts each other, effectively preventing the retaining wall from being squeezed and deformed, thus improving the strength of the retaining wall.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit protection technology, specifically a hybrid arrangement building foundation pit retaining wall. Background Technology

[0002] Pit retaining walls, also known as pit support structures, are temporary retaining wall structures used to stabilize pits during construction. They mainly bear the water and soil pressure generated during pit excavation and transfer this pressure to the support. Traditional retaining walls include: steel sheet piles, reinforced concrete sheet piles, bored piles, diaphragm walls, gravity cement-soil walls, and SMW method piles, etc.

[0003] Sheet piles are often used for the protection of building foundation pits because they are convenient to operate and can be reused. However, traditional sheet piles have some drawbacks: First, sheet piles are connected by splicing individual piles, and the width of a single pile is relatively narrow, requiring frequent and multiple pile driving operations, which affects construction efficiency. Second, although the spliced ​​sheet piles are connected by interlocking, they still need to withstand the lateral pressure of the soil. The spliced ​​sheet piles are prone to deformation and displacement, reducing their supporting capacity. Utility Model Content

[0004] The purpose of this utility model is to provide a hybrid arrangement of building foundation pit retaining walls, which increases the width of the metal baffles and reduces the amount of metal baffles used per unit length, avoiding frequent and repeated piling. Subsequently, the metal baffles are alternately connected to the steel column structure, and the steel columns are supported by the support structure, thereby improving the stability of the retaining wall and preventing the retaining wall from deforming and displacing under stress, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hybrid arrangement retaining wall for building foundation pits, comprising:

[0006] Multiple sets of enclosure steel plate structures and steel column pile structures;

[0007] The enclosure steel plate structure includes multiple sets of spliced ​​metal baffles, and the steel column pile structure includes a column-shaped main body and a ground-breaking tip at the bottom;

[0008] The metal baffles are connected to each other and to the columnar body through a connecting structure.

[0009] A supporting structure is also provided on the outside of the columnar main body.

[0010] Preferably, the connecting structure includes a cylinder and an arc-shaped notch, the cylinder being engaged within the arc-shaped notch, and a metal baffle and the two sides of the columnar body being fixed to the cylinder and the arc-shaped notch, respectively.

[0011] Preferably, the support structure includes a right-angle frame, a support inclined plate is fixed to the inner side of the right-angle frame, multiple sets of ground nails are fixed to the bottom of the right-angle frame, and the side of the right-angle frame is attached to the outer side of the columnar body.

[0012] Preferably, the columnar body has slots on both sides, and the right-angle frame has a clip that engages with the slots on its side.

[0013] Preferably, multiple sets of limiting bolts are threadedly connected to the right-angle frame from top to bottom, and the limiting bolts pass through the right-angle frame and fit against the outer side of the columnar body.

[0014] Preferably, the metal baffle is wavy and all corners are right angles.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model uses alternating connections between the retaining wall steel plate structure and the steel column pile structure. Then, a supporting structure is used to support the steel column pile structure to prevent it from tilting. The steel column pile structure then supports the retaining wall steel plate structure on both sides, thereby improving the overall strength of the retaining wall. The retaining wall steel plate structure and the steel column pile structure are spliced ​​together through a connecting structure, which is not only convenient to connect but also mutually restricts each other, effectively preventing the retaining wall from being squeezed and deformed, and improving the strength of the retaining wall.

[0017] 2. This utility model uses the combination of ground nails and card slots to conveniently restrict the two right-angled sides of the right-angled frame, and utilizes the stability of the right-angled triangle to provide stable support for the steel column pile structure. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the steel column pile structure of this utility model;

[0020] Figure 3 This is a three-dimensional structural diagram showing the disassembled support structure and columnar main body of this utility model.

[0021] Figure 4 This is a three-dimensional structural diagram of the disassembled metal baffle of this utility model;

[0022] Figure 5 This is a three-dimensional structural diagram of another form of the metal baffle of this utility model.

[0023] The following are labeled in the diagram: 1. Metal baffle; 2. Columnar main body; 3. Breaking tip; 4. Connecting structure; 41. Column; 42. Arc-shaped notch; 5. Supporting structure; 51. Right-angle frame; 52. Supporting inclined plate; 53. Ground nail; 6. Slot; 7. Clip; 8. Limiting bolt. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] This utility model provides, for example Figures 1-5 The hybrid arrangement of the building foundation pit retaining wall shown includes:

[0026] Multiple sets of enclosure steel plate structures and steel column pile structures;

[0027] The steel plate structure of the enclosure includes multiple sets of spliced ​​metal baffles 1, and the steel column pile structure includes a column-shaped main body 2 and a ground-breaking tip 3 at the bottom;

[0028] The metal baffles 1 are connected to each other and to the columnar body 2 through the connecting structure 4;

[0029] A support structure 5 is also provided on the outside of the columnar main body 2;

[0030] The retaining wall is constructed by alternating the steel plate structure and the steel column pile structure. The steel column pile structure is then supported by the support structure 5 to prevent it from tilting. The steel column pile structure then supports the steel plate structure on both sides, thereby increasing the overall strength of the retaining wall. The steel plate structure and the steel column pile structure are spliced ​​together by the connecting structure 4, which not only facilitates the connection but also restricts each other, effectively preventing the retaining wall from being squeezed and deformed, and thus increasing the strength of the retaining wall.

[0031] The production and application of steel sheet piles in China mainly follow the standard "Hot-rolled Steel Sheet Piles" (GB / T 29654-2013), and commonly used steel grades are divided into two categories:

[0032] Carbon structural steel

[0033] Representative grade: Q235 (yield strength ≥235MPa), low carbon content (≤0.22%), good plasticity and weldability, low cost, but average strength and corrosion resistance.

[0034] Applicable scenarios: shallow foundation pits (excavation depth ≤ 5m), temporary support projects (such as small municipal pipeline excavation), or cost-sensitive temporary projects.

[0035] Low alloy high strength structural steel

[0036] Representative grade: Q355 (yield strength ≥355MPa), with added alloying elements such as Mn, Si, and V, has a strength that is more than 40% higher than Q235, and also has certain weather resistance and weldability.

[0037] Applicable scenarios: medium-deep foundation pits (5-10m), permanent or semi-permanent support (such as underground garage foundation pits), and projects with complex geological conditions (such as soft soil and sand layers). It is currently the mainstream choice in China (for example, the Larssen steel sheet piles produced by Baosteel and Ansteel mostly use Q355).

[0038] Among them, such as Figure 2-5 As shown:

[0039] The connecting structure 4 includes a cylinder 41 and an arc-shaped notch 42. The cylinder 41 is snapped into the arc-shaped notch 42. The cylinder 41 and the arc-shaped notch 42 are respectively fixed to the two sides of the metal baffle 1 and the columnar body 2. Through the cooperation of the cylinder 41 and the arc-shaped notch 42, not only can the two sets of metal baffles 1 be spliced, but also during installation, it is more in line with the need to perform piling operations on the metal baffles 1 one by one. That is, it is convenient to snap the cylinder 41 into the arc-shaped notch 42 from the top.

[0040] Furthermore, such as Figure 3 As shown:

[0041] The support structure 5 includes a right-angle frame 51, with a support inclined plate 52 fixed to the inner side of the right-angle frame 51. Multiple sets of ground nails 53 are fixed to the bottom of the right-angle frame 51. The side of the right-angle frame 51 is attached to the outer side of the columnar body 2. The support inclined plate 52 supports the right-angle frame 51, improving its stability. The bottom of the right-angle frame 51 is prevented from sliding by the ground nails 53, and then it is supported by attaching to the columnar body 2.

[0042] Preferred, such as Figure 3 As shown:

[0043] The columnar body 2 has slots 6 on both sides, and the right-angle frame 51 has a clip 7 that is fixed in the slot 6 on the side. The right-angle frame 51 and the columnar body 2 can be stably connected by the slot 6 and the clip 7.

[0044] It is worth noting that, such as Figure 3 As shown:

[0045] Multiple sets of limiting bolts 8 are threadedly connected from top to bottom on the right-angle frame 51. The limiting bolts 8 pass through the right-angle frame 51 and fit against the outer side of the columnar body 2. By turning the limiting bolts 8, the limiting bolts 8 abut against the columnar body 2, so that the locking strip 7 and the locking groove 6 fit tightly against each other by friction, preventing the right-angle frame 51 from sliding up and down on the outer side of the columnar body 2.

[0046] In a further preferred embodiment, such as Figure 4-5 As shown:

[0047] The metal baffle 1 is wavy with right angles at all corners. By limiting the shape of the metal baffle 1, the wavy shape can increase the contact area with the soil and prevent relative displacement between the soil and the metal baffle 1.

[0048] like Figure 5 As shown, in order to avoid the cylinders 41 and arc-shaped grooves 42 on both sides of the two sets of metal baffles 1 appearing at the splicing position at the same time, the cylinders 41 and arc-shaped grooves 42 can be set on both sides of the metal baffles 1 and staggered, thus avoiding the need to turn the direction of the metal baffles 1, which would increase the difficulty of operation and workload.

[0049] In practical use, the metal baffle 1 and steel column pile structure are laid on the ground in sequence according to the planned route. Then, the metal baffle 1 and steel column pile structure are lifted by hoisting equipment and driven into the soil using sheet pile hammer or vibratory pile driving equipment. Before driving the next set of metal baffle 1 or steel column pile structure into the soil, the cylinder 41 is inserted into the arc-shaped notch 42. Then, the metal baffle 1 or steel column pile structure is driven into the soil to complete the installation of the retaining wall. The upper part of the metal baffle 1 or steel column pile structure needs to be exposed above the soil layer. The right angle frame 51 is moved from the top of the steel column pile structure, and the locking strip 7 is moved down along the locking groove 6. After the ground nail 53 at the bottom of the right angle frame 51 is inserted into the ground, the limiting bolt 8 is tightened so that the limiting bolt 8 is tightly attached to the outer side of the column body 2. The friction force is used to make the locking strip 7 fit into the locking groove 6 to ensure the stability between the right angle frame 51 and the steel column pile structure.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hybrid arrangement retaining wall for building foundation pits, characterized in that, include: Multiple sets of enclosure steel plate structures and steel column pile structures; The enclosure steel plate structure includes multiple sets of spliced ​​metal baffles (1), and the steel column pile structure includes a column-shaped main body (2) and a ground-breaking tip at the bottom (3); The metal baffles (1) are connected to each other and to the columnar body (2) by a connecting structure (4); A support structure (5) is also provided on the outside of the columnar main body (2).

2. The hybrid arrangement retaining wall for building foundation pits according to claim 1, characterized in that: The connecting structure (4) includes a cylinder (41) and an arc-shaped notch (42). The cylinder (41) is snapped into the arc-shaped notch (42). The cylinder (41) and the arc-shaped notch (42) are respectively fixed to the two sides of the metal baffle (1) and the columnar body (2).

3. The hybrid arrangement retaining wall for building foundation pits according to claim 1, characterized in that: The support structure (5) includes a right-angle frame (51), with a support inclined plate (52) fixed on the inner side of the right-angle frame (51), and multiple sets of ground nails (53) fixed at the bottom of the right-angle frame (51). The side of the right-angle frame (51) is attached to the outer side of the columnar body (2).

4. A hybrid arrangement retaining wall for building foundation pits according to claim 3, characterized in that: The columnar body (2) has slots (6) on both sides, and the right-angle frame (51) has a clip (7) that is engaged in the slot (6) on its side.

5. A hybrid arrangement retaining wall for building foundation pits according to claim 3, characterized in that: Multiple sets of limiting bolts (8) are threaded from top to bottom on the right-angle frame (51). The limiting bolts (8) pass through the right-angle frame (51) and fit against the outer side of the columnar body (2).

6. A hybrid arrangement retaining wall for building foundation pits according to claim 1, characterized in that: The metal baffle (1) is wavy and all corners are right angles.

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