Introduction to the lifting pump station sinkhole construction technology?

Talking about the lifting pump station sinkhole construction technology is very important, the use of technology is a good way to solve practical problems, each detail is very critical. Zhongda consulting on the shallow lifting pump station sinkhole construction technology and introduce to you.

Introduction

As an important construction part of the water conservancy project, one of the most common construction technology is sinkhole construction. It is the main link in the scope of construction of underground engineering and deep foundation engineering, and can also be counted as an essential structural form of deep foundation engineering. In recent years, under the guidance of advanced technology, sinkhole construction technology has been greatly improved, but in the water pumping station sinkhole construction technology is still lacking, need to management and experts to carry out in-depth research to ensure that the water pumping station sinkhole construction technology to meet the needs of modernization and construction.

1 Project Overview

On the construction of water pumping station project, now to a water pumping station construction technology as a case, the water pumping station sinkhole project to do an in-depth analysis, from the adoption of the relevant construction technology as the object of study. Of course, as a water pumping station sinking project, its construction focus is sinking wells, wells outside the precipitation sinking as a starting point, and the application of dry sealing and pouring to the top of the technical methods, but also involves continuous sinking to the design elevation factors. For example, a hydropower station water intake pumping station original lower design for rectangular, large excavation construction. But in the construction process due to change the hydropower station is located in the river level continues to be high, and the pumping station is located in the river bank, the cover layer for the fine sand, when dug to the original ground below about 6m, due to seepage of water, resulting in the excavation of the slope instability, although the enlargement of the slope ratio, sand bag protection, additional clay seepage walls, increase pumping equipment and other measures, but the slope is still generated by the flow of sand, landslides phenomenon, endangering the excavation equipment and the construction personnel's safety! However, the slopes still had sand flow and landslide phenomenon, which jeopardized the safety of excavation equipment and construction personnel. After the design, owners, supervisors, construction units on-site consultations, decided to change the pumping station lower part of the round, sinkhole construction, pumping station location depending on the site to move (within 50m), sinkhole structure size of 16.2 meters × 11 meters, sinking depth of 5.3 meters.

2 construction preparation

Site set up settlement observation point, in order to sinkhole construction regular settlement observation, timely grasp of sinkhole sinking and deflection; at the same time, the arrangement of a JC350 drum mixer, in order to shorten the distance of the concrete transportation, to ensure that the concrete pouring temperature to meet the specification requirements; and equipped with two 6-inch centrifugal pumps, a spare 8-inch centrifugal pumps, to sinkhole Pit drainage; also equipped with a 25-ton crane, used to pour concrete and with artificial well slagging.

3 water pump station sinkhole construction technology

3.1 Measurement and sampling

About the measurement and sampling technology, based on the relevant control points in the given measurement control network, the application of latitude and longitude and leveling instrument, and then according to the design of the coordinates of the control points, scientifically determine the location of the structure, and to set up temporary control piles around. By measuring the dimensions of the original topographic map, as well as the dimensions of the pit section, the side control piles are buried 5 meters away from the excavation line to effectively control the construction measurement. In addition, before the earthwork construction, the construction measurement and sampling, check and accept the measurement results therein.

3.2 Earth Excavation

About the earth excavation technology, when the site becomes level, 111.3 backhoe excavator should be used to excavate the program. It should be noted that in the process of mechanical excavation, the foundation of the management room and the foundation of the valve well are reserved for the protection layer, which is cleaned up by hand to the design bottom elevation, in order not to disturb the original foundation. In addition, in order to facilitate the construction, anti-squeeze slope soil produced slope collapse phenomenon, for the excavated earth, be sure to use the excavator to discard to the excavation outside the edge of the line three meters.

3.3 Earth backfill

The earth backfill technology, mainly for the application of excavated earth from the pit, i.e., the required backfill transported by 8t tipper trucks to the site one kilometer away. Back when, the use of 2.8kW frog-type tamping machine and other small machines layered compaction, and in the range of the frozen layer outside the well wall, the need to stick one hundred millimeters thick benzene board, and then layered shake fill medium-coarse sand, backfill sand range needs to be controlled, the use of inserted vibrator layer vibration, so as to achieve a medium-dense state. Before the earth backfill, first in the backfill test section for construction, to determine the construction parameters, according to the construction parameters for backfill. Clean up all the debris inside the pit, and backfill the earth only after the supervisor's acceptance. In the process of earth backfilling, it needs to be tested by the quality control tester to ensure that the quality of backfilling is monitored and fundamentally meets the requirements of the engineering design.

3.4 Concrete engineering

About the concrete engineering technology, in order to ensure the construction quality and reduce the phenomenon of temporary occupation of the construction, in the construction of the water lifting pump station sinkhole, the basic technical requirements of the concrete engineering are as follows.

3.4.1 Design ratio

About the ratio, need to be designed according to the engineering design and the actual situation on the site design, based on the calculation and test of the outsourcing project quality inspection, reasonable determination of the concrete ratio. In addition, the slump needs to be decided according to the climate of the concrete and other related conditions, so as to select the optimal mix ratio with a small slump.

3.4.2 Mixing technology

For the concrete of this project, it is better to apply Jz350 mixer to mix it, except for the sinkhole and water-conducting well. Of course, first of all, before construction, we should calculate the batching list of the project at the mixing site, and eliminate self-change. In addition, the mixing technology of the concrete project is particularly important, the site operator in the mixing process should always determine the water content of the aggregate, the abnormal amount of water should be adjusted in a timely manner, so that the water-cement ratio to maintain stability.

3.4.3 Pouring concrete

For the water pumping station sinkhole construction technology, the pouring concrete part is also a key link, before pouring, must apply to the supervisor in advance, write the parts that need to be poured, and can open the tank to pour only after approval. If, when pouring, encounter unsuitable operating weather, pouring operations can not be carried out, in order to ensure the quality of construction, reasonable measures must be taken to control the concrete pouring operation, or immediately stop the work.

3.5 Sinkhole bottoming

After completing the pouring of the wall of the sinkhole, the bottom of the sinkhole bedding and the construction of the bottom plate bottom plate was originally designed as a 30cm-thick C20 concrete bedding, and then in the process of construction, taking into account the movement of groundwater is easy to make the bottom of the bottom plate to form a "funnel shape", coupled with the bottom of the plate to withstand the water pressure, it is easy to cause the bottom plate concrete to pull the layer. Larger, easy to cause the bottom concrete cracking, while taking into account the edge of the foot and the existence of construction joints between the bottom concrete, prone to water seepage problems agreed by the Design Institute, the bottom will be changed to the bottom of the pot, set the C20 concrete bedding and 50cm thick C25 reinforced concrete well bottom, and at the bottom of the edge of the foot of the position of the setting of the steel stopper

Sinkhole bottom pouring using drainage bottom method, that is, in the middle of the sinkhole set up A catchment well for pumping water concrete pouring from all around to the center, the bedding concrete surface should be chiseled and trimmed to the bottom of the pot before the upper layer of reinforced concrete construction in the bottom concrete strength of 70%, the catchment well water pumping, inserted into the casing, and quickly backfill in the catchment well with dry and hard high-strength concrete, and finally backfill concrete in the casing, the top of which is welded closed and wrapped with concrete to prevent the casing. And wrapped with concrete to prevent the casing from rusting

3.6 Building Quality Inspection

For concrete engineering buildings, quality assurance is the key point, so before pouring concrete on the foundation surface, it is necessary to check the treatment and acceptance of the foundation together with the engineer.

Conclusion

In short, the water pumping station sinkhole construction in modern engineering construction plays a huge role, and its application is also more and more widely used, such as agricultural irrigation, centralized water supply for drinking water and sewage pumping station and a series of projects, need to use the water pumping station in the reality of the hydropower station intake pumping station sinkhole construction, the lack of corresponding technical references, but the parties involved in the construction to overcome all kinds of difficulties, and continue to find out, according to the construction of the pumping station, and the construction of the pumping station, and the construction of the pumping station. Various difficulties, constantly explore, according to the actual site, adjust the program in due course, but also for the construction of the construction to provide and accumulate a reliable construction experience.

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