Ground source heat pump deep well backfill grouting method

Abstract

The invention provides a ground source heat pump deep well backfill grouting method. The ground source heat pump deep well backfill grouting method is characterized by comprising the following steps that after or while a heat exchange pipe is arranged in a deep well, a long grouting pipe is inserted into the bottom of the deep well; backfill slurry is conveyed to the bottom of the deep well through a slurry conveying pump by means of the long pipe, grouting is conducted at the bottom to fill a well shaft through counter pressure, and the surface of the slurry gradually rises to form back pressure; when the back pressure reaches a first pressure value, the long pipe starts to be lifted, the purpose that while grouting is conducted, the pipe is lifted is achieved, the back pressure is maintained between a second pressure value and the first pressure value until the slurry overflows from a well mouth, and then the whole deep well is filled with the slurry. By the adoption of the ground source heat pump deep well backfill grouting method, the high density of the backfilling slurry is guaranteed, the heat conducting capacity of the heat exchange deep well is greatly improved, the construction quality of a ground source heat pump system is effectively guaranteed, and energy conservation and emission reduction are really achieved.

Description

technical field [0001] The invention relates to a process method for backfilling and grouting construction, in particular to a backfilling and grouting method for deep wells of ground source heat pumps. Background technique [0002] Due to its advantages of environmental protection, high efficiency and energy saving, ground source heat pump technology has developed rapidly in recent years. Among them, vertical buried pipe ground source heat pump has become the mainstream direction of ground source heat pump due to its high heat exchange efficiency and small footprint. This technology requires drilling a large number of small-diameter deep heat exchange wells with a depth of about 80-200m. After the heat exchange tubes are buried, they need to be filled with mortar and other materials with good thermal conductivity. The heat exchange of the heat exchange tube. [0003] However, at present, this process often uses manual methods to pour mortar materials from the wellhead of d...

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Problems solved by technology

[0003] However, at present, this process often uses manual methods to pour mortar materials from the wellhead of deep wells. Due to the small diameter of the well body, the remaining space is small except for the heat exchange pipes. This makes the manual method not only inefficient, but also easy to block in the middle of the deep well, resulting in Completely empty; secondly, manual watering requires the use of slurry with a high water content, otherwise it cannot be poured from a narrow well, so that a large number of cavities will be formed after the water of the refilling slurry is absorbed or permeated. The above two reasons lead to the empty or hollow part Filled with air, the heat exchange effect is extremely poor, the construction quality is difficult to guarantee, and the ground source heat pump technology cannot even be realized

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