Basement enclosure based on corbel force transmission strips

Abstract

The utility model provides a basement enclosure structure based on corbel force transmission belt, including triaxial mixing pile, triaxial mixing pile construction is inserted with enclosure section steel simultaneously every other one, triaxial mixing pile and enclosure section steel top are provided with concrete enclosure purlin and overhanging corbel, and the inclined pile is inserted into the bottom plate in the oblique direction, and the top end and enclosure section steel are integrated through steel bar binding and concrete pouring. The upper corbel force transmission belt is arranged between the enclosure section steel and the basement outer wall, the steel bar of the upper corbel force transmission belt is fixed through steel bar binding with the bottom plate steel bar, and is integrated with the bottom plate through concrete pouring, unloads external pressure, and the external force of the enclosure structure is transmitted to the bottom plate through the upper corbel force transmission belt, and the stability of the foundation pit is improved. The utility model upper corbel force transmission block has significant improvement in bearing capacity, deformation capacity, construction efficiency, durability and the like through the combined design of section steel and steel bar, and is especially suitable for soft soil foundation, deep foundation pit support, large-span underground engineering and other complex scenes.

Description

Technical Field

[0001] This utility model belongs to the field of foundation pit retaining construction technology, and in particular relates to a basement retaining structure collaborative system based on corbel force transmission belt. Background Technology

[0002] Currently, there are several types of force transfer strips for deep foundation pits: The first is the steel-supported force transfer strip, which features rapid installation, adjustable prestress, and lightweight construction. It is mainly suitable for densely populated urban areas and dynamic load zones, but its limitation is the need for real-time monitoring of axial force loss. The second is the lattice-type force transfer strip, which features high spatial stiffness and reduces the number of supports, making it suitable for ultra-deep and ultra-large planar foundation pits. Its limitations include high precision requirements for joints and higher costs. The third is the ring-shaped force transfer strip, which features uniform circumferential stress and significant deformation control, mainly suitable for circular or irregularly shaped foundation pits and deep vertical shafts. Its limitations include complex construction and high costs for irregularly shaped formwork. The fourth is the reinforced concrete force transfer strip, which features high stiffness, strong integrity, and resistance to deformation, mainly suitable for soft soil and large-span foundation pits. Its limitations include long construction periods and difficult dismantling.

[0003] To address the aforementioned technical problems, this invention designs a basement enclosure structure based on corbel force transmission blocks. Through the synergistic effect of steel and concrete, the corbel force transmission blocks exhibit generational advantages in load-bearing capacity, waterproofing, and ductility, making them particularly suitable for the stringent reliability and durability requirements of modern underground engineering. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a basement enclosure structure based on corbel force transfer strips. It offers a new structural form from conventional concrete force transfer blocks. The corbel force transfer blocks on the bottom slab, through the combination design of structural steel and reinforcing steel, significantly improve the load-bearing capacity, deformation capacity, construction efficiency, and durability compared to ordinary concrete force transfer blocks. It is especially suitable for complex scenarios such as soft soil foundations, deep foundation pit support, and large-span underground engineering.

[0005] This utility model achieves the above-mentioned technical objectives through the following technical means.

[0006] A basement retaining structure based on a corbel force transmission strip includes three-axis mixing piles driven into the foundation soil around the excavation pit, and retaining steel inserted into the three-axis mixing piles at intervals; inclined piles are inserted into the bottom slab and waterproofed by a water-stop ring in the middle, and their tops and the retaining steel are integrated by steel reinforcement binding and concrete pouring; an upward-turning corbel force transmission strip is set between the retaining steel and the basement exterior wall, and the steel reinforcement of the upward-turning corbel force transmission strip is tied and fixed to the bottom slab steel reinforcement, and the upward-turning corbel force transmission strip and the bottom slab are integrated by concrete pouring.

[0007] Furthermore, the top of the inclined pile support is connected to the retaining steel through a concrete waler and an outward-projecting corbel.

[0008] Furthermore, the reinforcing bars of the upward-turning corbel force transmission zone are made of quincunx-shaped shear-resistant steel mesh.

[0009] Furthermore, the top dimension of the upward-turning corbel force transmission belt is narrower than the bottom dimension, and the overall cross-section has a trapezoidal structure.

[0010] Furthermore, during the pouring of the upward-turning corbel force transmission strip, the cement and soil on the surface of the retaining steel on the inner side wall of the pit are removed, and the upward-turning corbel force transmission strip is poured up to the retaining steel.

[0011] Furthermore, the height of the upward-turning corbel force transmission belt is lower than the excavation depth of the foundation pit.

[0012] This utility model has the following beneficial effects:

[0013] This invention provides a new structural form from conventional concrete force transfer blocks. The upward-turning corbel force transfer block, through the combination design of structural steel and reinforcing steel, has significantly improved in terms of bearing capacity, deformation capacity, construction efficiency, and durability compared to ordinary force transfer strip structures. It is especially suitable for complex scenarios such as soft soil foundations, deep foundation pit support, and large-span underground engineering. Moreover, it does not require real-time monitoring of axial force loss, has low cost, is simple and convenient to construct, has a short construction period, and is easy to dismantle. Attached Figure Description

[0014] Figure 1 This is a schematic plan of the basement enclosure structure based on the corbel force transmission belt;

[0015] Figure 2 This is a schematic diagram showing the binding of the reinforcing bars of the top corbel to the bottom slab reinforcing bars;

[0016] Figure 3 This is a schematic cross-sectional view of the basement enclosure structure based on the corbel force transmission belt;

[0017] In the diagram: 1-Enclosure steel, 2-Triaxial mixing pile, 3-Upturned corbel force transmission belt, 4-Base slab, 5-Basement exterior wall, 6-Inclined pile brace, 7-Concrete waler and cantilever corbel; 8-Base slab reinforcement; 9-Waterstop ring. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0019] like Figures 1 to 3 As shown, the basement retaining structure based on the corbel force transmission belt of this utility model includes retaining steel 1, triaxial mixing pile 2, upward corbel force transmission belt 3, base plate 4, inclined pile brace 6, concrete waler and cantilever corbel 7.

[0020] like Figures 1 to 3 As shown, several triaxial mixing piles 2 are driven into the foundation soil around the excavation pit to reinforce the soil. During the construction of the triaxial mixing piles 2, retaining steel sections 1 are inserted at intervals. Concrete walers and cantilevered brackets 7 are installed on top of the triaxial mixing piles 2 and the retaining steel sections 1. The inclined pile bracing 6 is a prefabricated structure manufactured in the factory. The inclined pile bracing 6 is inserted obliquely into the base slab 4, with a waterproof ring in the middle. Its top and the retaining steel sections 1 are integrated through steel reinforcement binding and concrete pouring. That is, the top of the inclined pile bracing 6 and the retaining steel sections 1 are connected by concrete walers and cantilevered brackets 7.

[0021] like Figures 1 to 3 As shown, the upward-turning corbel force transmission strip 3 is set between the retaining steel 1 and the basement exterior wall 5; specifically, the reinforcing bars of the upward-turning corbel force transmission strip 3 are tied and fixed to the bottom slab reinforcing bars 8, and the upward-turning corbel force transmission strip 3 and the bottom slab 4 are integrated by concrete pouring, which can relieve external pressure and transfer the external force of the retaining structure to the bottom slab 4 through the upward-turning corbel force transmission strip 3, thereby improving the stability of the foundation pit.

[0022] Preferably, the reinforcing steel of the upward-turning corbel force transmission zone 3 is a quincunx-shaped shear reinforcement mesh; the top dimension of the upward-turning corbel force transmission zone 3 is narrower than the bottom dimension, and the overall cross-section is trapezoidal; during the pouring of the upward-turning corbel force transmission zone 3, the cement-soil on the surface of the retaining steel 1 on the inner side wall of the pit is removed, and the upward-turning corbel force transmission zone 3 is poured up to the retaining steel 1; the height of the upward-turning corbel force transmission zone 3 is lower than the excavation depth of the foundation pit; the angle between the inclined pile brace 6 and the retaining steel 1 is 40°. (Instruction manual attached) Figures 1 to 3 All numerical dimensions are in mm.

[0023] The construction method of the basement enclosure structure collaborative system based on corbel force transmission belt described in this utility model is as follows:

[0024] Step 1: Reinforce the soil using the three-axis mixing pile construction technique;

[0025] Step 2: During the construction of the three-axis mixing pile 2, the retaining steel 1 is inserted at intervals to enhance the stability of the soil.

[0026] Step 3: Insert inclined piles 6 at an angle to the design elevation according to the coordinate points;

[0027] Step 4: Construct concrete walers and cantilevered corbels 7 on the soil surface, and make the retaining steel 2 and inclined pile bracing 6 into a whole through steel bar binding and concrete pouring;

[0028] Step 5: Excavate the earthwork to the design elevation at the bottom of the foundation pit;

[0029] Step 6: Clean the surface of the retaining steel 2 of mud and cement slurry to make it smooth for easy connection of the upper corbel force transmission belt 3;

[0030] Step 7: Tie the reinforcing bars of the upper corbel force transmission belt 3 and the bottom slab reinforcing bars 8;

[0031] Step 8: Concrete pouring is used to make it a whole to relieve external pressure. The external force of the retaining structure is transferred to the bottom slab 4 through the upward corbel force transmission belt 3, thereby improving the stability of the foundation pit.

[0032] Step 9: Unloading path: Enclosure steel 2 → Upward-turning corbel force transmission belt 3 → Base plate 4.

[0033] The embodiments described above are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention shall fall within the protection scope of the present invention.

Claims

1. A basement enclosure based on corbelled force transfer strips, characterized in that, The structure includes three-axis mixing piles (2) driven into the foundation soil around the pit, and retaining steel (1) inserted into the three-axis mixing piles (2) at intervals; inclined pile bracing (6) inserted into the bottom slab (4) with a water-stop ring in the middle for waterproofing, and its top and retaining steel (1) forming an integral whole through steel reinforcement binding and concrete pouring; an upward corbel force transmission belt (3) is set between the retaining steel (1) and the basement exterior wall (5), and the steel reinforcement of the upward corbel force transmission belt (3) is tied and fixed with the bottom slab steel reinforcement (8), and the upward corbel force transmission belt (3) and the bottom slab (4) are formed as a whole through concrete pouring.

2. The corbelled strip-based basement enclosure of claim 1, wherein, The top of the inclined pile brace (6) is connected to the retaining steel (1) through a concrete waler and an outward-facing corbel (7).

3. The corbelled force-carrying strip-based basement enclosure according to claim 1, characterized in that, The reinforcing bars of the upward-turning corbel force transmission band (3) are made of plum blossom-shaped shear-resistant steel mesh.

4. The corbelled force-carrying strip-based basement enclosure according to claim 1, characterized in that, The top dimension of the upward-turning corbel force transmission belt (3) is narrower than the bottom dimension, and the overall cross-section is trapezoidal.

5. The corbelled force-carrying strip-based basement enclosure according to claim 1, characterized in that, When the upward corbel force transmission belt (3) is poured, the cement soil on the surface of the inner side wall of the pit is removed, and the upward corbel force transmission belt (3) is poured up to the retaining steel (1).

6. The corbelled force-carrying strip-based basement enclosure according to claim 1, characterized in that, The height of the upward-turning corbel force transmission belt (3) is lower than the excavation depth of the foundation pit.

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