Chimney foundation solution groove excavation and replacement filling construction method

Abstract

The invention discloses an excavation and replacement construction method for a chimney foundation dissolving tank. The excavation and replacement construction method comprises the construction process of completely cleaning hard soil and ballast mixtures in the side wall and the bottom when the soil dissolving tank is excavated to rocks. Due to the fact that the excavator excavates the soil dissolving tank to the rock on the operation platform, the mixture of hard soil and ballast in the side wall and the bottom of the soil dissolving tank is completely cleaned, then rubble pouring concrete is placed on the rock, and the bottom rubble layer and the upper rubble layer which are formed in a layered mode replace the mixture of the hard soil and the ballast in the soil dissolving tank. The chimney foundation is stably located on the top face of the rock and the top face of the upper rubble layer, the stability of the chimney foundation is guaranteed, and the problem that grouting of the steel pipe group piles cannot completely eliminate a mixture of hard soil and stone ballasts in a soil dissolving groove, and potential safety hazards exist on the chimney foundation in the later period is solved.

Description

Technical Field

[0001] The present invention relates to a construction method for excavation and replacement filling of a chimney foundation dissolution tank, belonging to the technical field of chimney foundation construction. Background Art

[0002] When constructing a circular chimney foundation on the foundation soil, the stability of the chimney foundation needs to be ensured. In the construction site of the chimney foundation, there is a situation where a soil dissolution tank crosses under the chimney foundation. The soil dissolution tank is a mixture of hard soil and stone chips, and the strength of the mixture is insufficient. The later construction of the chimney foundation will affect the stability. Therefore, it is necessary to reinforce the soil dissolution tank.

[0003] For the existing construction technology for reinforcement treatment of insufficient strength, see Chinese Patent Publication No. CN111560941A. Although the steel flower tube steel pipe group pile grouting reinforcement can achieve the reinforcement treatment, the steel pipe group pile grouting cannot completely eliminate the mixture of hard soil and stone chips in the soil dissolution tank, which poses a safety hazard to the later chimney foundation. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a construction method for excavation and replacement filling of a chimney foundation dissolution tank.

[0005] The present invention is achieved through the following technical solutions.

[0006] A construction method for excavation and replacement filling of a chimney foundation dissolution tank provided by the present invention includes:

[0007] The construction process of excavating the soil dissolution tank to the rock and completely cleaning the mixture of hard soil and stone chips on the side wall and bottom.

[0008] The construction process includes:

[0009] Building a slag transportation access road and an operation platform on the rock outside the chimney foundation;

[0010] The excavator excavates the soil dissolution tank to the rock on the operation platform and completely cleans the mixture of hard soil and stone chips on the side wall and bottom of the soil dissolution tank.

[0011] A personnel passage is provided on the side of the slag transportation access road.

[0012] Guardrails are provided between the personnel passage, the slag transportation access road and the operation platform for separation.

[0013] The construction process further includes: selecting rubble stones, placing the rubble stones on the rock in the soil solution tank with intervals between the rubble stones, pouring concrete material, with the concrete material wrapping the rubble stones, and after the concrete material solidifies, forming the bottom rubble stone layer; placing the rubble stones again on the bottom rubble stone layer and pouring another layer of concrete material, and after the concrete material solidifies, forming the upper rubble stone layer. Gradually construct multiple upper rubble stone layers in sequence, layer by layer until reaching the bottom surface position of the chimney foundation, and the top surface of the topmost upper rubble stone layer is flush with the top surface of the rock.

[0014] The construction process further includes: constructing the chimney foundation on the upper rubble stone layer that is flush with the top surface of the rock.

[0015] The bottom rubble stone layer and the upper rubble stone layer are connected to the rock through steel bar anchors, and there are overlapping sections vertically for the steel bar anchors.

[0016] The beneficial effect of the present invention lies in that since the excavator excavates the soil solution tank to the rock on the operation platform, completely clears the mixture of hard soil and stone debris on the side wall and bottom of the soil solution tank, and then places the rubble stones on the rock and pours concrete, the bottom rubble stone layer and the upper rubble stone layer formed by layering replace the mixture of hard soil and stone debris in the soil solution tank, enabling the chimney foundation to be stably located on the top surface of the rock and the top surface of the upper rubble stone layer, ensuring the stability of the chimney foundation, and solving the problem that the grouting of the steel pipe group piles cannot completely eliminate the mixture of hard soil and stone debris in the soil solution tank, which poses a potential safety hazard to the later chimney foundation. Description of the Drawings

[0017] Figure 1 is the top view schematic diagram of the present invention;

[0018] Figure 2 is the side view sectional distribution diagram of the chimney foundation, soil solution tank, and rock of the present invention;

[0019] In the figure: 1 - chimney foundation; 11 - slag transportation access road; 12 - operation platform; 13 - personnel passage; 15 - outer foundation edge; 16 - inner foundation edge; 2 - soil solution tank; 3 - rubble stone; 31 - bottom rubble stone layer; 32 - upper rubble stone layer; 33 - concrete material; 4 - rock; 41 - steel bar anchor. Detailed Embodiment

[0020] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited thereto.

[0021] As Figures 1 to 2 shown.

[0022] A construction method for excavating and replacing the soil solution tank of a chimney foundation according to the present application includes the following steps:

[0023] Build a slag transportation access road 11 and an operation platform 12 outside the chimney foundation 1. The slag transportation access road 11 is used for the transport vehicle to travel. The transport vehicle transports the mixture of hard soil and rock debris excavated from the soil solution tank 2 outward. The operation platform 12 is for the excavator to stand for excavation operations. A personnel passage 13 is provided on the side of the slag transportation access road 11 for personnel to walk. Guardrails are provided between the personnel passage 13, the slag transportation access road 11 and the operation platform 12 to separate them at intervals.

[0024] When the excavator excavates the soil solution tank 2 to the rock 4 on the operation platform 12, manually completely clean the floating soil and loose stones on the side wall and bottom of the soil solution tank 2. The cleaned floating soil and loose stones are loaded into the bucket of the excavator and transported out of the pit. After the cleaning is completed, invite the relevant unit personnel to accept until it is qualified.

[0025] Select rubble 3. The rubble 3 is selected as solid, unweathered, crack-free and clean stones. The particle size is generally 20*15*15 cm, not more than 30 cm, and the strength grade is not less than C20. During construction, the placement of the rubble 3 is carried out by using a small excavator for transportation in cooperation with manual work. The admixture of the rubble 3 is generally 20%, and the maximum cannot exceed 25%. The rubble 3 is placed in layers on the rock 4. After the bottom layer of rubble layer 31 is arranged evenly and neatly, pour the concrete material 33 with a thickness of 15 cm to 20 cm. After the concrete material 33 is cured, then place the rubble 3 on the bottom layer of rubble. The rubble 3 should be arranged evenly and neatly, with the large surface facing down, and leave a spacing of more than 10 cm. The distance between the rubble 3 and the edge of the chimney foundation solution tank excavation and replacement construction method should not be less than 15 cm. After the placement of the rubble 31 is completed, pour another layer of concrete material 33 to form the upper layer of rubble layer 32. Gradually construct multiple upper layers of rubble layer 32 until the bottom surface position of the chimney foundation 1. The inner and outer widths are both wider than the bottom edge size of the original foundation by more than 500 mm.

[0026] The bottom layer of rubble layer 31 and the upper layer of rubble layer 32 are connected to the rock 4 through the steel bar anchor 41. The steel bar anchor 41 with an overlapping section vertically can disperse the loads of the bottom layer of rubble layer 31 and the upper layer of rubble layer 32 to the rock 4.

[0027] The chimney foundation 1 is constructed on the upper layer of rubble layer 32 flush with the top surface of the rock 4, forming a chimney foundation structure with a solution tank at the bottom.

[0028] The chimney foundation 1 has a foundation outer edge line 15 and a foundation inner edge line 16.

[0029] The annular overall stability of the chimney foundation 1 is on the rock 4 and the upper layer of rubble layer 32.

[0030] Since the excavator excavates the soil dissolution tank 2 to the rock 4 on the operation platform 12, completely clears the mixture of hard soil and stone debris inside the side wall and bottom of the soil dissolution tank 2, and then places rubble 3 on the rock 4 and pours concrete, the bottom rubble layer 31 and the upper rubble layer 32 formed by layers replace the mixture of hard soil and stone debris in the soil dissolution tank 2, enabling the chimney foundation 1 to be stably located on the top surface of the rock 4 and the top surface of the upper rubble layer 32, ensuring the stability of the chimney foundation and solving the problem that the grouting of the steel pipe group piles cannot completely eliminate the mixture of hard soil and stone debris in the soil dissolution tank, which poses a safety hazard to the later chimney foundation.

Claims

1. A chimney foundation trough excavation and replacement construction method, characterized in that: include: The invention relates to a construction process in which the side walls and the bottom of the soil dissolution tank (2) are completely cleaned of the hard soil and ballast mixture when the soil dissolution tank (2) is excavated to the rock (4).

2. The chimney foundation molten groove excavation and replacement construction method according to claim 1, characterized in that: The construction process includes: A slag transport path (11) and an operating platform (12) are constructed on the rock (4) outside the chimney foundation (1); The excavator excavates the soil soluble groove (2) to the rock (4) on the operating platform (12), and completely cleans the hard soil and stone ballast mixture in the side wall and bottom of the soil soluble groove (2).

3. The chimney foundation molten groove excavation and replacement construction method according to claim 2, characterized in that: A personnel passage (13) is provided on the side of the slag transport path (11).

4. The chimney foundation molten groove excavation and replacement construction method according to claim 3, characterized in that: Guardrails are provided between the personnel passage (13), the slag transport path (11) and the operating platform (12) to separate them.

5. The chimney foundation molten groove excavation and replacement construction method according to claim 2, characterized in that: The construction process also includes: selecting rubble stones (3), placing the rubble stones (3) on the rocks (4) in the soil solution groove (2), with intervals between the rubble stones (3), pouring concrete (33), the concrete (33) wrapping the rubble stones (3), and the concrete (33) forming a bottom rubble stone layer (31) after solidification; placing rubble stones (31) again on the bottom rubble stone layer (31), pouring another layer of concrete (33), and the concrete (33) forming an upper rubble stone layer (32) after solidification, and gradually constructing multiple upper rubble stone layers (32), and the upper rubble stone layers (32) constructed layer by layer until the bottom surface of the chimney foundation (1), and the top surface of the topmost upper rubble stone layer (32) is flush with the top surface of the rock (4).

6. The chimney foundation molten groove excavation and replacement construction method according to claim 5, characterized in that: The construction process also includes: constructing a chimney foundation (1) on the upper rough stone layer (32) that is flush with the top surface of the rock (4).

7. The chimney foundation molten groove excavation and replacement construction method according to claim 6, characterized in that: The bottom rubble stone layer (31) and the upper rubble stone layer (32) are connected to the rock (4) via steel bar anchors (41).

Images