阅读说明：本技术 适应复杂地质条件的顺逆结合的旋流井施工方法 (Clockwise and anticlockwise combined cyclone well construction method suitable for complex geological conditions ) 是由 杜成林 刘航 孟令斌 于 2019-11-22 设计创作，主要内容包括：本发明涉及地下结构物领域,具体为一种适应复杂地质条件的顺逆结合的旋流井施工方法。一种适应复杂地质条件的顺逆结合的旋流井施工方法,其特征是：按如下步骤依次实施：①大开挖；②二次开挖；③逆做筒壁；④内外筒施工。本发明减少施工量,确保施工安全。(The invention relates to the field of underground structures, in particular to a forward and reverse combined cyclone well construction method suitable for complex geological conditions, which is characterized by comprising the following steps of ① large excavation, ② secondary excavation, ③ reverse wall making and ④ inner and outer cylinder construction.)

1. A clockwise and anticlockwise combined cyclone well construction method suitable for complex geological conditions is characterized by comprising the following steps: the method is implemented in sequence according to the following steps:

① heavy excavation, namely, taking earth surface 0-3.48 m as backfill, constructing to the position of elevation-6 m by adopting an excavation mode, setting the slope ratio to be 1:0.6, taking the site radius to be 21.9m, reinforcing the slope protection by adopting bar planting and plain concrete (1), simultaneously adding annular water collecting ditches at the periphery of the position of elevation-6 m, and discharging rainwater and accumulated water of the subsequent construction of the cyclone well by adopting a pumping mode;

② secondary excavation, namely, continuing excavation to the position of elevation-13.5 m, setting the slope proportion to be 1:0.6, performing construction of a ring beam (2) with the thickness of 1.5m when excavation is performed, performing construction of wall wells on the side wall of the ring beam (2) with the height of 0.5m respectively for installing water-stop steel plate strips, performing construction of a cylinder wall (3) at the position of elevation-13.5 m to-7.5 m after the construction of the ring beam (2) is completed, backfilling to the position of elevation-8 m after the concrete strength meets the requirement, tamping, and constructing a slag flushing ditch and a rotational flow pool connector;

③ reverse construction of cylinder wall, namely hoisting the inner earthwork at the side of the backfill well wall by a 50-ton crane station, reversely constructing the cylinder wall (3) with the elevation ranging from-27 m to-13.5 m from top to bottom according to the length of each section ranging from-2.5 m, and subsequently constructing a bottom plate, a plain concrete slope bottom and 12 flow stabilizing plates (4) in sequence;

④ construction of inner and outer cylinders, namely constructing the inner cylinder (51) at the position of elevation-20 m to 0.5m and the outer cylinder (52) at the position of elevation-7.5 m to 0.5m, and finally constructing the beam slab platform (6) at the position of elevation 0.5 m.

2. The clockwise and anticlockwise combined cyclone well construction method suitable for complex geological conditions as claimed in claim 1, wherein: the method is characterized in that:

step ①, adopting a large excavation mode, namely excavating all earthwork above a building foundation bearing layer to an elevation of-6 m;

in the step ②, continuously excavating to a position with an elevation of-13.5 m by adopting a secondary slope-releasing mode, and constructing the cylinder wall (3) with the elevation of-13.5 m to-7.5 m by adopting a normal construction method after the construction of the ring beam (2) is finished;

in step ④, the construction method is adopted to construct an inner cylinder (51) with a height of-20 m to 0.5m and an outer cylinder (52) with a height of-7.5 m to 0.5 m.

Technical Field

The invention relates to the field of underground structures, in particular to a construction method of a clockwise and anticlockwise combined cyclone well suitable for complex geological conditions.

Background

The cyclone well is a vortex type sedimentation tank and consists of a water inlet, a water outlet, a grit chamber, a sand collecting area, a sand lifting pump, a sand discharge pipe, a motor, a gearbox and the like. When the centrifugal sand settling tank is used, sewage flows into the sand settling tank from the water inlet along the tangential direction, the motor drives the rotary table and the impeller to rotate, under the centrifugal effect, sand grains with higher density in the sewage are thrown to the tank wall and fall into the sand hopper, and organic matters are remained in the water. The rotating speed of the motor is adjusted to achieve the best sedimentation effect.

When the construction of the cyclone well needs to dig the earth, and when the complex geology of the coastal region with the layer miscellaneous soil and the argillaceous siltstone from the ground to the bottom is encountered, because the underground water is abundant and the construction period is short, the construction needs to be simultaneously carried out on the peripheral rolling line foundation, the water treatment foundation and the equipment installation, the requirements of site construction cannot be met by adopting a forward construction method (namely vertical excavation) or a reverse construction method (namely open caisson construction), the construction excavation amount is large, and the construction potential safety hazard is large.

Disclosure of Invention

The invention provides an underground structure construction method for reducing construction amount and ensuring construction safety in order to overcome the defects of the prior art, and discloses a forward and reverse combined cyclone well construction method suitable for complex geological conditions.

The invention achieves the purpose by the following technical scheme:

a clockwise and anticlockwise combined cyclone well construction method suitable for complex geological conditions is characterized by comprising the following steps: the method is implemented in sequence according to the following steps:

① large excavation, namely, 0-3.48 m of the ground surface is backfilled soil, the excavation mode is adopted to construct the slope to the position of elevation-6 m, the slope release ratio is 1:0.6, the radius of the occupied site is only 21.9m, the slope protection is reinforced by planting bars and plain concrete, meanwhile, annular water collecting ditches are arranged around the position of elevation-6 m, and the pumping mode is adopted to discharge rainwater and accumulated water of the subsequent construction of the cyclone well;

② secondary excavation, namely, continuing excavation to the position of elevation-13.5 m, setting the slope proportion to be 1:0.6, performing ring beam construction with the thickness of 1.5m when excavation is performed, constructing a ring beam side wall well with the height of 0.5m for installing a water stop steel plate strip, performing barrel wall construction at the position of elevation-13.5 m to-7.5 m after the ring beam construction is completed, backfilling to the position of elevation-8 m after the concrete strength meets the requirement, and constructing a slag flushing ditch and a rotational flow pool interface at the same time;

③ reverse construction of cylinder wall, namely hoisting the internal earthwork at the side of the backfill soil well wall at a 50-ton crane station, reversely constructing the cylinder wall at the elevation of-27 m to-13.5 m from top to bottom according to the length of each section of 2.5m, and subsequently constructing a bottom plate, a plain concrete slope bottom and 12 flow stabilizing plates in sequence;

④ construction of inner and outer cylinders, namely construction of the inner cylinder at the elevation of-20 m to 0.5m and the outer cylinder at the elevation of-7.5 m to 0.5m, and finally construction of the beam slab platform at the elevation of 0.5 m.

The clockwise and anticlockwise combined cyclone well construction method suitable for complex geological conditions is characterized by comprising the following steps of: the method is characterized in that:

step ①, adopting a large excavation mode, namely excavating all earthwork above a building foundation bearing layer to an elevation of-6 m;

in the step ②, continuously excavating to a position with a height of-13.5 m by adopting a secondary slope-releasing mode, and constructing the cylinder wall (3) with a height of-13.5 m to-7.5 m by adopting a normal construction method after the construction of the ring beam is finished;

in step ④, the right method is adopted to construct an inner cylinder with a height of-20 m to 0.5m and an outer cylinder with a height of-7.5 m to 0.5 m.

The invention is suitable for construction site limitation, has more complex geological conditions, can reduce the workload of construction excavation and other auxiliary measures, and increases the safety of construction. The invention adopts a method of combining the forward construction and the reverse construction for construction, thereby ensuring that the influence on the surrounding environment is reduced as much as possible, reducing the construction cost and ensuring the construction safety.

Drawings

FIG. 1 is a cross-sectional view of a swirl well.

Detailed Description

The invention is further illustrated by the following specific examples.