January 19, 2022

Fengjing open tank safety measures

I. Project Overview

Ling Lu Coal Mine Ventilation inclined flume plagioclase 50.227㎜ segment, an azimuth angle of 324 ° 30 ', a slope of 25 °. The angle of the open channel slope is 35°, the maximum excavation depth is 20.632 meters, and the bottom of the groove is 7000mm. The cut amount of the open trough section is 17000m3, and the backfilling amount is 15800 m3. This inclined shaft is a double-layer reinforced concrete support with bottom arch, thickness is 400mm, C30砼, spacing between bars is 200mm, ring rib is Φ16mm, parallel floor bar is Φ10mm, and structural rib is Φ6mm , are all grade I steel bars. The bottom concrete is 50mm thick and the foundation is 500mm thick.

According to the wellbore inspection hole J3, it can be known that the depth to the original surface is 9.15 meters and the fine sand and clay , 9.15 meters to 13.2 meters for gravel and fine sand, 13.2-15.5 meters for silty clay, and 15.5 meters for bedrock. . Since the J3 hole just after construction is near the wind well, the groundwater and sand layer have been turned on, which has certain influence on the open channel construction.

Second, the construction plan

The excavator is used to excavate the open trough by means of large excavation, and the dump truck is filled with earth to fill the industrial square or to the designated place of Party A. The slope is maintained by means of inserting baffles and sandbags. After the excavation of the Ming trough section is completed, the masonry foundation is built first, then the bottom is laid, and then the steel bars are tied from the bottom to the top, and the concrete is stabilized and poured. After 28 days of concrete pouring, the soil was backfilled around the wellbore, and the internal bottom arch was backfilled with masonry.

Third, security measures

1. Topsoil excavation

1) The excavator driver must be certified to work and strictly follow the operating procedures.

2) Before the excavation, the ground obstacles must be cleaned up and the roads are unblocked.

3) Before the excavator works, it must check its running mechanism and braking system, and take anti-sliding measures before the lifting, the ground is soft, the water is anti-subsidence danger, and the steep slope is prevented from turning over.

4) The excavator is strictly forbidden to maintain and refuel during operation. During the process of turning or digging, the bucket is strictly prohibited from changing direction. No hard objects are forcibly excavated. All personnel are not less than 3 meters away from the mechanical activity radius.

5) Only when the dump truck driver sends out the soil loading signal, the earth and stone can be installed in the vehicle.

6) It is strictly forbidden to pass the bucket from above the cab of the dump truck, load the vehicle evenly, and not to be biased or overloaded.

7) When excavating the open trough, it must be excavated layer by layer from top to bottom. The thickness of each layer can be mastered by the excavator driver, and should not exceed 3 meters. The construction can be carried out under the deep excavation.

8) If there is water in the tank, it is drained by the clear drainage method. At this time, a water collecting pit is set at the bottom of the pit to allow the water to flow into the pit, and then the pump is discharged to a distant place. The puddle pit is arranged outside the foundation area. The pit is reinforced with wooden boards. After the foundation is dug enough to design the depth, the bottom of the pit should be 1-2 meters below the base surface, and the gravel filter water is laid. The Water Pump is suspended on the steel pipe frame. Special care to prevent the silt from damaging the pump body, and the pump drains at any time.

9) When the slope is constructed at 35°, when the soil layer of the slope is unstable, it is maintained by the pegs and the woven mesh is maintained if necessary.

10) Pull the police cords, railings and nets around the upper mouth of the open trough. It is strictly forbidden for the idlers to enter. Each class has a special person responsible for safety and must not throw objects into the trough.

2, stable mold pouring

1) The template must be firmly and reliably installed, the screws are aligned, and the tie rods and struts are complete and reliable.

2) The person must wear a belt when working at a height of 2 meters or more, and the belt is firmly rooted.

3) Pay attention to the safety of others when tying the steel bars to prevent smashing, puncture, and injury.

4) The concrete is fully stirred by the JS-500 mixer, driven into the concrete pump and then input into the template. The electric vibrating rod is used to fully vibrate. The conveying pipe is set tightly, and the machine is maintained by a special person.

5) If the dumped concrete is transported by dump truck, it should not be too close to the steep slope, and there should be no people near 5 meters in the lower part.

6) Special types of work are certified.

3. Security maintenance

1) A warning cord is placed around the open slot, and non-workers are not allowed to enter.

2) No one may carry out activities such as throwing debris or drainage into the pit that are not conducive to safety.

3) The debris near the pit and on the slope should be removed in time to prevent people from falling and hurting.

4) Buildings or structures within the construction area such as nearby poles must be removed in time.

5) All construction workers must pay attention to the safety impact of various vehicles.

6)) The upper part of the open trough is constructed with earthen cofferdams and the height is not less than 600mm to prevent rainstorm from entering the open trough. Therefore, it is necessary to prepare enough woven bags and a large flow pump and matching water pipes to discharge the water 150 meters. In addition, to prevent back seepage into the tank.

7) Special maintenance of electrical equipment must comply with relevant regulations.

Third, technical quality

1, steel

1). The variety, specification and quality of the processing of steel bars and steel bars must meet the requirements of the design and regulations.

2). The surface of the steel bar must be clean. It is strictly forbidden to use steel bars with cracks, broken edges and nicks.

3). The specification quality of steel processing must meet the design requirements.

4). Reinforcement lap length: 30d for outer reinforcement, 480mm for φ16mm; 300mm for φ10mm; 20d for inner reinforcement, 320mm for φ16mm; 200mm for φ10mm. The lap length is marked with paint. The spacing of the reinforcing bars is 200mm, the reinforcing bar of the parallel plate is 340/330mm, and the error is ±20mm.

5). The steel bar binding must be horizontal and vertical, without buckles and loose buckles, and the overlap should be staggered.

6). The protective layer of the steel bar is 25mm on the outer edge of the inner wall and 40mm on the outer edge of the outer wall, with an error of ±10mm.

2, template

1). The material, structure, specification and strength of the template abortion must comply with the relevant provisions of the design and operation regulations.

2). Formwork assembly, the channel steel frame must be firm and reliable, and the bone legs can be slabs.

3). Template assembly deviation:

The distance from the center line of the wellbore to the template is 2100mm (+10~+30mm);

The distance from the 1 meter waistline to the top and bottom plate is 2100/1700mm (+10~+30mm).

4). Allowable deviation:

Axis displacement ≤5mm

The flatness of the joint is ≤15mm.

3, ç ¼ engineering

1). The quality of cement, aggregate, water and admixture used must meet the design requirements and relevant regulations and procedures.

2). The ratio of bismuth, raw material measurement, mixing quality must comply with the design specifications and regulations.

3). The water in the wellbore, the water in the water, the conduit, the trough removal, and the ground have rain protection measures.

4). Specification deviation:

The distance from the center line of the wellbore to a gang: 2100mm (0~+30mm);

Net height 1 meter waist line to top and bottom distance 2100/1800mm (0 ~ +30mm)..

5). Wall thickness

Wellbore: not less than the design;

6). Surface quality: no cracks, honeycombs, dog holes, and exposed bars.

7). Allowable deviation

The joint of the watering pot is ≤15mm;

Flatness: ≤10mm.

8) The bottom is 100mm thick, C30ç ¼.

Pay attention to environmental sanitation and do a good job in civilized construction.

The unfinished matters were implemented in accordance with the “Safety Regulations for Coal Mines” and “Organization Design for Shaft Drilling of Shaft Mine Shafts in Lingluo Coal Mine Co., Ltd.”.

Supplementary measures for construction safety technology of main shaft in Linglu Coal Mine

First, the project situation

Since the main well has been excavated to the design of the inclined section, the design depth is only 2 meters. It can be seen that the rock hole is still fine sand layer at the depth of 15.6 meters at the depth of 15.6 meters. No bedrock is seen. However, it is dark gray clay in the depth of 13-13.7 meters.

Second, security measures

On May 25, 2009, the relevant leaders of Zha Coal Company, Linglu Coal Mine, and Supervision Company and our unit jointly analyzed and studied, and believed that the open trough continued to excavate too long and unsuitable (blocking Dongfeng Road for a long time, earthwork excavation Dawei), so decided to extend the inclined shaft by 5 meters, so that the roof of the wellbore is under the clay floor, which is good for controlling the roof and achieving construction safety.

1. The measurement department must accurately measure the vertical depth of the above layer of clay.

2. Extend the 5 m wellbore and release the slope line on the ground.

3. Party A shall contact the highway for temporary diversion. Once the road is rerouted, it is necessary to set up obstacles at 30 meters from the construction site at both ends of the construction section and hang warning signs.

4. The front slope shall not be greater than 45°, and the slopes on both sides shall not be greater than 35°.

5. There is a special person to monitor the stability of the slope. In case of danger, the personnel in the pit must be evacuated in time.

6. Strengthen the maintenance of the slope, and start the masonry foundation after the open trench has been drilled for the length and depth.

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