CN211113807U - A substation frozen soil thaw defect remedy concrete foundation structure - Google Patents

Abstract

The utility model provides a substation frozen soil thawing defect remedying concrete foundation structure, which comprises a foundation pit for excavating defective parts, a filling structure is arranged in the foundation pit, and the filling structure comprises a multi-layer geotechnical bag, and the geotechnical bag is filled with frozen soil. The structure can improve the stability of the foundation, play the role of protecting the buildings on the permafrost layer, and has low production and maintenance costs.

Description

A substation frozen soil thaw defect remedy concrete foundation structure

technical field

The utility model belongs to the technical field of building construction, in particular to a substation frozen soil thawing defect remedy concrete foundation structure.

Background technique

my country's permafrost area occupies a large part of the country's land area. Frozen soil is a multiphase complex system cemented by ice and has special properties. Compared with other soil types, the biggest feature is that the properties of water, heat and force are unstable. At present, the buildings constructed in large-scale permafrost areas suffer from diseases, mainly due to the warming of atmospheric temperature and the destruction of the natural water and heat balance of permafrost by human activities. Deformation and collapse of structures. Frost heave and thawing caused by frozen soil affect the stability of buildings and adversely affect engineering construction. Therefore, human construction activities such as engineering construction must overcome these dangers. This demand is especially reflected in the power industry, the erection of transmission lines, the construction of substations and so on.

When building buildings on the ground prone to thawing, in 2004, a new idea of "actively cooling frozen soil subgrade and actively protecting permafrost" was proposed, breaking through the traditional "passive thermal insulation" theory, and developed Radiation-based sunshade subgrade, block stone base subgrade, block (crushed) slope protection subgrade and pipeline ventilation subgrade mainly for regulating convection, heat pipe subgrade and thermal insulation board-heat pipe composite subgrade mainly for regulating conduction, and extremely high temperature, The dry bridge and other engineering measures adopted in the permafrost regions with high ice content have achieved great success in the maintenance of the stability of the permafrost subgrade of the Qinghai-Tibet Highway and Railway in a low-cost and environmentally friendly way.

However, the positive effect of the thermal insulation layer subgrade reducing the heat absorption of the subgrade body is not continuous throughout the year. It only has a positive effect in the warm season when the external temperature is greater than the temperature in the subgrade body and the temperature gradient tends to increase the temperature of the subgrade body. Crushed stone and flake stone roadbeds have a large demand for stone materials, and whether there are nearby stone materials that are suitable for mining and meet various properties such as strength is a problem that should be considered in the design. The hot rod basically does not work in the warm season (only when the temperature fluctuates negative temperature, and the temperature difference between the two ends of the hot rod exceeds the starting temperature difference), and this engineering measure is also very time-sensitive. Hot rod engineering measures have high engineering costs and are easily corroded by rainwater and soil, making anti-corrosion treatment and durability issues to be solved by this engineering measure.

In summary, the existing engineering and technical measures (such as heat insulation layer, heat pipe/rod, ventilation pipe, etc.) have achieved some results, but the construction measures for permafrost under the substation substation foundation still need further research and verification.

SUMMARY OF THE INVENTION

The technical problem to be solved by the utility model is to provide a substation frozen soil thawing defect remedy concrete foundation structure, improve the stability of the foundation, protect the buildings on the frozen soil layer, and have low production and maintenance costs.

In order to solve the above-mentioned technical problems, the technical scheme adopted by the present utility model is: a substation frozen soil thawing defect remedy concrete foundation structure, including a foundation pit for excavating the defective part, a filling structure is arranged in the foundation pit, and the filling structure includes multiple structures. layer of geotechnical bags filled with frozen soil.

In a preferred solution, the outer layer of the filling structure is provided with a transition layer.

In a preferred solution, the transition layer is sand and gravel or a mixture of sand and gravel and lime soil.

In a preferred solution, fillers are arranged between the geobags.

In a preferred solution, the filler is sand and gravel.

In a preferred solution, the geotechnical bag is made of polyethylene.

The utility model provides a substation frozen soil thawing defect remedying concrete foundation structure, which has the following advantages:

1. The structure is simple and stable, with high bearing capacity, which can effectively improve the stability of the foundation and ensure the safety of the structure;

2. The gap between the geobags can quickly discharge the seepage water, which can effectively reduce the adverse effects of groundwater;

3. The materials required by the present invention are simple and easy to obtain, and can be realized only by polyethylene geotechnical bags and sand and gravel fillers, which can save costs for engineering construction;

4. The construction process is simple, and the requirements for construction climate and construction equipment are low, which can further save project construction costs.

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the utility model is further described:

Fig. 1 is the overall structure schematic diagram of the present utility model;

In the picture: foundation pit 1, geobag 2, frozen soil 3, transition layer 4, filling 5.

Detailed ways

As shown in Figure 1, a substation frozen soil thawing defect remediation concrete foundation structure includes a foundation pit 1 excavated from the defective part, the foundation pit 1 is provided with a filling structure, and the filling structure includes a multi-layer geotechnical bag 2, a geotechnical bag 2 Fill with frozen soil 3. The size of the geotextile bag 2 is 80cm*65cm, and it is a polyethylene (PP) material. Its performance index is: gram weight: ≧100g/m2, and the color is black. The tie band is small, convenient and quick to use, and more importantly, has a high tensile strength, which can ensure the integrity and long-term effectiveness of the geotextile bag.

The geotechnical bags are arranged in the way of manual laying, and they are arranged layer by layer from bottom to top. In the frozen soil area to be treated, first excavate the thawing defect part to form a foundation pit 1, and lay two layers at the bottom of the foundation pit 1 first. Geobag 2 is used to reduce the problem of uneven settlement of permafrost foundation. The geobag 2 is laid manually, and is leveled and compacted layer by layer with a small plate vibrating roller. The upper and lower geobags 2 require staggered laying.

The construction process of the geobag technology mainly includes three aspects: the production, laying and rolling of the geobag. Through a reasonable on-site construction organization, the mutual connection between the various processes can be well coordinated to achieve the best construction. efficiency. Geobags can be laid and rolled manually, mechanically integrated, or mechanically combined with manual labor. Basic principles: In order to have enough extension space for the geotextile bag during the compaction process, a gap of 5-10cm should be reserved between the geotextile bags of the same layer. After each layer is laid, use a backhoe on the surface of the geotextile bag. Static pressure 1-2 times. The upper and lower geotechnical bags should be laid with staggered seams.

Preferably, the outer layer of the filling structure is provided with a transition layer 4 . The transition layer 4 is sand and gravel or a mixture of sand and gravel and lime soil. In the event of thermal melt subsidence, the transition layer 4 can discharge the accumulated water in time, so that the geotechnical bag can function to maintain the strength, and the impact on the building on the foundation is minimized. At the same time, with the existence of lime soil, the lime soil has strong strength after being compacted and compacted. As a part of the foundation, it can resist the dynamic load and earth pressure, and can also play the role of anti-seepage.

Preferably, fillers 5 are arranged between the geotechnical bags 2 .

The filler 5 is sand and gravel or fine granules of excavated original soil. By backfilling fillers between the geo bags 2 , that is, between layers of the geo bags 2 or between the geo bags 2 of the same layer, the compactness of the stack of the geo bags 2 can be ensured.

Claims (6)

1. A substation frozen soil thawing defect remediation concrete foundation structure, characterized in that: it comprises a foundation pit (1) for excavating the defective part, the foundation pit (1) is provided with a filling structure, and the filling structure comprises a multi-layer geotechnical bag (2), the geotechnical bag (2) is filled with frozen soil (3). 2 . The concrete foundation structure for remediation of frozen soil thawing defects in a substation according to claim 1 , wherein the outer layer of the filling structure is provided with a transition layer ( 4 ). 3 . 3 . The concrete foundation structure for remediating frozen soil thawing defects in substations according to claim 2 , wherein the transition layer ( 4 ) is sand and gravel or a mixture of sand and gravel and lime soil. 4 . 4 . The concrete foundation structure for substation thawing defect remediation according to claim 1 , wherein fillers ( 5 ) are arranged between the geo bags ( 2 ). 5 . 5 . The concrete foundation structure for remediating frozen soil thawing defects in a substation according to claim 4 , wherein the filler ( 5 ) is sand and gravel. 6 . 6 . The concrete foundation structure for substation thawing defect remediation according to claim 1 , wherein the material of the geotextile bag ( 2 ) is polyethylene. 7 .

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