阅读说明：本技术 高层建筑深基坑遇软质弱土或潜水沼泽土开挖施工方法 (Construction method for excavating deep foundation pit of high-rise building in soft weak soil or diving marsh soil ) 是由 杜建钢 于 2019-11-08 设计创作，主要内容包括：本发明公开了高层建筑深基坑遇软质弱土或潜水沼泽土开挖施工方法,包括确定范围、确定开挖起点线、依据深基坑土方开挖方案,大型挖掘机进行土方挖运,直至挖运到设计基底标高以上预留高度进行二次清底外运；大型挖掘机转着圈围绕淤泥质软弱土场地或潜水沼泽土场地展开循环挖运。本发明通过数个工程项目深基坑偶遇古河道或深水塘沉积大量深厚淤泥质软弱土方或潜水沼泽土方挖运验证,不要投入任何宽厚钢板或标准路基箱和数台大型挖掘机接力式传倒,节约了机械设备和材料投入,缩短了工期,降低了工程项目成本,提高了工程项目经济效果。(The invention discloses a construction method for excavating a deep foundation pit of a high-rise building by using soft weak soil or diving marsh soil, which comprises the steps of determining a range, determining an excavation starting point line, excavating and transporting earthwork by a large excavator according to an earthwork excavation scheme of the deep foundation pit, and carrying out secondary bottom cleaning and outward transportation until the excavation is transported to a reserved height above the elevation of a designed substrate; the large excavator rotates to circularly dig and transport around a silt soft soil field or a diving marsh soil field. According to the invention, the excavation and transportation verification of a large amount of deep sludge soft earthwork or diving marsh earthwork deposited in the ancient river channel or the deep pond occasionally by the deep foundation pit of a plurality of engineering projects is carried out, and any wide and thick steel plate or standard roadbed box and a plurality of large excavators are not required to be put into relay type turnover, so that the mechanical equipment and material investment are saved, the construction period is shortened, the engineering project cost is reduced, and the economic effect of the engineering projects is improved.)

1. The excavation construction method for the deep foundation pit of the high-rise building in the case of soft weak soil or diving marsh soil is characterized by comprising the following steps:

the method comprises the following steps: determining the range, namely determining the range of a soft and weak silt soil field or a diving marsh soil field according to a geological survey report and a deep foundation pit earthwork excavation scheme and according to the actual situation of site survey;

step two: determining an excavation starting line, accurately positioning and paying off, and selecting and determining an earthwork excavation starting line of a good soil property field;

step three: according to the earth excavation scheme of the deep foundation pit, carrying out earth excavation and transportation by a large excavator until the earth excavation and transportation reaches a reserved height above the elevation of a designed substrate, and carrying out secondary bottom cleaning and outward transportation;

step four: the large excavator rotates to circularly dig and transport around a silt soft soil field or a diving marsh soil field.

2. The excavation construction method of the high-rise building deep foundation pit encountering soft weak soil or diving marsh soil according to claim 1, characterized in that the reserved height in the third step is 500 mm-600 mm.

3. The excavation construction method for the deep foundation pit of the high-rise building meeting the soft weak soil or the diving marsh soil according to claim 1, wherein in the fourth step, the silt soft weak soil or the diving marsh soil is evaporated and drained for a circle, and then the excavation and transportation are continued for a circle along the periphery, and the circulation is gradual until the excavation and transportation are completed.

Technical Field

The invention relates to an excavation process technical method of a large amount of deep silt soft soil or diving marsh soil deposited in occasional ancient riverways or deep ponds in the construction of basements and underground garages of high-rise buildings, in particular to an excavation construction method of deep foundation pits of high-rise buildings in occasional soft soil or diving marsh soil.

Background

At present, in the long-term practice of the construction of deep foundation pits of basements and underground garages of high-rise buildings, the prepared rehmannia root blocks provided by owners are frequently haphazardly encountered, a plurality of potential dangers and risks are hidden, water pumping and dredging are not carried out on ancient riverways or deep ponds according to the backfill requirements for cost, earthwork backfilling is directly carried out, and large-area deep-silt soft soil sites or diving marsh soil sites are artificially manufactured. In the bidding process, a construction general contract unit cannot find the true phase of backfilling even though deep investigation and research are carried out on site, potential risks are all transferred to the construction general contract unit, when the construction general contract unit enters site positioning and paying off, a constructor cannot walk to work suddenly, and large-scale earthwork mechanical equipment cannot enter the site for normal operation and excavation. The conventional habitual way is that: the wide and thick steel plates or the special standard roadbed boxes are paved, a plurality of large excavators are adopted to walk on the roadbed boxes, the vehicles are transferred in a relay mode and transported outwards, time is consumed, and the number of large excavators and the number of roadbed boxes are increased without counting cost. If the large excavator drops into the sludge, the large excavator cannot fall out of the matrix. Therefore, only one simple and effective construction process technical method is invented, which can ensure the self-running of the large-scale earthwork mechanical equipment, is safe and reliable, can improve the operation efficiency by multiple times, saves a large amount of investment in roadbed boxes and large-scale excavator equipment, reduces the engineering cost and improves the economic benefit.

After the general construction contract is signed, the construction site is usually the old land which is already backfilled by the owner, and the basement and the underground garage of the high-rise building are usually located under the old land and hide the ancient river channel or the deep pond with the area of tens of thousands of square meters. In the backfill process before the formation of the prepared rehmannia root, the owner directly forms a muddy soft soil field or a diving marsh soil field after the backfill without pumping water or dredging due to cost consideration. When the large-scale earthwork machinery equipment is used for on-site inspection, constructors cannot walk on the surface of the large-scale earthwork machinery equipment in rows, and the large-scale earthwork machinery equipment cannot enter a field to be normally excavated, wherein the constructors are not trapped in mud. Therefore, the invention provides a simple and effective technical method for the earth excavation process aiming at the unfavorable conditions of the actual construction.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the high-efficiency and feasible construction method for excavating the deep foundation pit of the high-rise building in soft weak soil or diving marsh soil is provided, the investment of mechanical equipment and materials is saved, the construction period is shortened, the cost of engineering projects is reduced, and the economic effect of the engineering projects is improved.

In order to solve the technical problems, the inventor obtains the technical scheme of the invention through practice and summary, and the invention discloses a construction method for excavating deep foundation pits of high-rise buildings when encountering soft weak soil or diving marsh soil, which comprises the following steps:

the method comprises the following steps: determining the range, namely determining the range of a soft and weak silt soil field or a diving marsh soil field according to a geological survey report and a deep foundation pit earthwork excavation scheme and according to the actual situation of site survey;

step two: determining an excavation starting line, accurately positioning and paying off, and selecting and determining an earthwork excavation starting line of a good soil property field;

step three: according to the earth excavation scheme of the deep foundation pit, carrying out earth excavation and transportation by a large excavator until the earth excavation and transportation reaches a reserved height above the elevation of a designed substrate, and carrying out secondary bottom cleaning and outward transportation;

step four: the large excavator rotates to circularly dig and transport around a silt soft soil field or a diving marsh soil field.

Preferably, the reserved height in the third step is 500 mm-600 mm.

Preferably, in the fourth step, the water in the soft silt soil or the diving marsh soil is evaporated and drained for a circle, and the digging and the transportation are continued for a circle along the periphery, and the circulation is gradual until the digging and the transportation are completed completely.

Compared with the prior art, the invention can obtain the following technical effects:

1. according to the invention, the excavation and transportation verification of a large amount of deep sludge soft earthwork or diving marsh earthwork deposited in the ancient river channel or the deep pond occasionally by the deep foundation pit of a plurality of engineering projects is carried out, and any wide and thick steel plate or standard roadbed box and a plurality of large excavators are not required to be put into relay type turnover, so that the mechanical equipment and material investment are saved, the construction period is shortened, the engineering project cost is reduced, and the economic effect of the engineering projects is improved.

2. The invention changes the original forward excavation and transportation earthwork path, 'open construction gallery road and dark storehouse', firstly excavates and transports the deep foundation pit with good peripheral soil quality to 500 mm-600 mm above the designed substrate elevation, and leaves secondary clearing and transportation. Meanwhile, the soft silt soil or the diving marsh soil is filtered by solarization and evaporation, and is subjected to solarization and evaporation for one circle, and the soil is dug and transported for one circle in time, and the circulation is gradual until the whole earthwork is dug and transported.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

Fig. 1 is a schematic plan view of the present invention.

FIG. 2 is a cross-sectional view of the present invention.

In the figure:

1. a sludge soft soil field or a diving marsh soil field,

2. excavating a starting point line, and then excavating a pit,

3. the secondary cleaning and transporting layer is arranged on the upper layer,

4. the elevation of the base is designed,

5. a large excavator.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The application of the principles of the present invention will be further described with reference to the accompanying drawings and specific embodiments.