CN201099920Y - heat preservation well - Google Patents

Abstract

The utility model relates to a thermal insulation water collection well, which is composed of a turf covering layer, a filling layer, a thermal insulation layer, a block stone layer, a permeable geotextile and a water outlet. There is an insulation layer at the bottom of the well wall, the water outlet end of the well head or one side of the well wall, and a permeable geotextile is provided on both sides or one side of the well wall. The block stone layer is piled up in the well, and the top of the well is a filling layer. The turf cover layer, the water outlet is connected with the underground drainage pipe. The utility model uses permeable geotextiles to replace the anti-filter layer composed of gravel and block stones in traditional measures, which greatly improves the construction speed; replaces the traditional clay layer with XPS insulation board, and has the dual effects of water insulation and heat preservation , The heat loss of the water in the sump well is very little. The utility model has the advantages of simple structure, easy construction, fast heat preservation effect, favorable drainage, and reduces engineering freezing damage caused by poor drainage in winter, and can be widely used in underground water collection and drainage systems of highways, railways and other projects in cold regions.

Description

heat preservation well

technical field

The utility model relates to a groundwater collection structure in cold regions. Suitable for underground water collection and drainage systems in cold regions.

Background technique

Most of my country's land area is in the cold region. Road engineering and mine engineering in cold regions all involve the collection and discharge of groundwater. The traditional way of collecting groundwater is to collect groundwater in seepage wells and ponds, and then drain it through hidden pipes and blind ditches. Due to the cold climate in cold regions in winter, the water collection structure, hidden pipes, and blind ditch are easily frozen and blocked, resulting in the failure of the entire water collection and drainage system and causing damage to the project; the water collection structure mainly relies on increasing the thickness of the soil layer to achieve heat preservation. This method is slow in construction, poor in effect and unfavorable for environmental protection. The most common is the occurrence of saliva ice disease on roads and railways in cold regions, which brings serious hidden dangers to transportation safety and also causes huge economic losses. The generation of salivary ice is due to the blockage of the drainage pipe, the water is exposed from some places above the roadbed, freezes on the surface, spreads to the roadbed, and congests the culvert. These pose a great threat to the stability and traffic safety of roads and auxiliary structures. In addition, many frontier defense roads in the northeast and northwest of our country suffer from the hazards caused by saliva ice all the year round, which greatly affects the transportation of materials needed by the troops.

Raising the water temperature in the water collection well can effectively prevent the drainage pipeline from freezing. Electric heating is used in the prevention and control of railway saliva ice in Russia. The application of this method is limited by many conditions and is not suitable for use in the vast cold regions of our country. The traditional infiltration wells and infiltration tanks used in my country have complex structures, and clay is used as the water-repellent layer, and coarse sand and gravel are used as the reverse filter layer. The construction is difficult. Another important reason is that the thermal insulation effect is not ideal. It is greatly reduced, which is not conducive to drainage. Therefore, it is of great significance to develop a new type of effective thermal insulation water collection well to solve the above problems.

Contents of the invention

In order to overcome the defects of unsatisfactory thermal insulation effect, complex structure and difficult construction of the traditional underground water collection structure in cold regions, the utility model provides a thermal insulation water collection well. The water collection well adopts new thermal insulation material XPS board for insulation treatment, uses permeable geotextile as the reverse filter layer, stacks rocks in the well, and at the same time covers the top of the water collection well with turf to enhance the insulation effect. This can greatly increase the construction speed and increase the water temperature in the collection well, reduce the possibility of drainage pipeline freezing, and reduce the losses caused by drainage problems in cold area projects.

The technical scheme that the utility model solves its technical problem adopts is:

A thermal insulation water collection well is composed of a turf covering layer, a filling layer, a thermal insulation layer, a block stone layer, a permeable geotextile and a water outlet. There is an insulation layer at the bottom of the well wall, the water outlet surface of the well head or one side of the well wall, and a permeable geotextile is provided on both sides or one side of the well wall. A stone layer is stacked in the well, and the top of the well is a filling layer. The turf cover layer, the water outlet is connected with the underground drainage pipe.

The above insulation layer adopts XPS board, XPS insulation board is polyethylene, polyurethane insulation board, thickness range is 5-20cm, thermal conductivity is 0.028W/m·K; compressive strength is greater than 0.3Mpa, volume water absorption is less than 1%.

The permeability coefficient of the above-mentioned permeable geotextile is not less than 2cm/s.

The particle size range of the above-mentioned block stone layer is 10-25 cm.

The above-mentioned backfill thickness is 20-50cm.

The working principle of the thermal insulation collection well is: the groundwater in the aquifer enters the collection well through the permeable geotextile, and then drains away through the drainage outlet, which is connected to the underground drainage pipe. The bottom, side and top of the water collection well have extruded foam insulation material XPS boards with good thermal insulation effect, which greatly reduces the loss of water heat in the water collection well.

Advantage of the utility model and the beneficial effect that produce are:

1. The utility model uses the XPS board to replace the traditional clay layer, which has the double effect of water insulation and heat preservation; secondly, the XPS board greatly reduces the thickness of the top soil layer (see formula 4), and the heat preservation effect of the XPS board with a thickness of 20cm It is equivalent to the thermal insulation effect of the local 2-5m thick soil layer. At the same time, there is a turf covering layer on the top, which maintains the original landscape and is conducive to environmental protection.

2. Use permeable geotextile to replace the anti-filter layer composed of gravel and block stone in traditional measures, which greatly improves the construction speed;

3. Due to the use of new materials and the improvement of the structure, the water temperature in the collection well has been increased, the possibility of freezing the underground drainage pipeline has been reduced, and the damage caused by drainage problems in cold area projects has been reduced.

The insulation material can reduce the maximum thickness of filling soil and can be calculated according to the following formula:

In the formula: H is the maximum thickness of the soil layer that can be reduced; _λfill means the thermal conductivity of the fill; _{λinsulation material} is the thermal conductivity of the insulation material; h _{insulation material} is the thickness of the insulation material.

Description of drawings

Fig. 1 Longitudinal sectional view of heat preservation water collection well.

Fig. 2 is A-A' sectional view of Fig. 1.

Detailed ways

In order to better understand the utility model, the following examples can be used to further illustrate, but not limit the utility model.

As shown in FIG. 1 , a thermal insulation water collection well is composed of a turf cover layer 1 , a filling layer 2 , a thermal insulation layer 3 , a block stone layer 4 , a permeable geotextile 5 , and a water outlet 7 . An insulating layer 3 is provided at the bottom of the well wall, the water outlet end of the well head or one side of the well wall, and a permeable geotextile 5 is provided on both sides or one side of the well wall. There is a turf covering layer 1 on the soil layer 2, and the water outlet 7 is connected with the underground drainage pipe.

Take the heat preservation water collection well adopted at K81+300 of Lamo Highway in Greater Khingan Mountains as an example. Geographical coordinates: N50°47.759′, E120°03.758′. With an altitude of 774m, it belongs to the high latitude cold area.

The construction process is as follows: first uncover the turf covering layer 1 on the surface of the water collection location, in order to restore the surface landscape after completion; dig a 205cm deep, 200cm long, and 200cm wide cuboid well at the water collection location. A polyethylene insulation board with a thickness of 15cm is laid on one side, and the boards are bonded with an adhesive to form an insulation layer 3; a hole 7 with a diameter of 20cm is arranged on the water outlet surface at a height of 10cm from the bottom to connect with the underground drain pipe. The position is located in the middle part of the length direction (the section direction perpendicular to the drainpipe is the length direction); then pile up the block stone layer 4 with an average particle diameter of 20cm at the position close to the polyethylene insulation board, further fix the insulation layer 3, and then Lay permeable geotextile 5 on the water surface as a reverse filter layer, and then continue to stack rocks until the height of 150cm is reached to form a rock layer 4, stop stacking rocks, and then cover with a 20cm thick polyethylene insulation board; fill 40cm to form a fill layer 2 After proper rolling, cover the top of the catch well with the original uncovered sod. Groundwater 6 seeps into the well through the permeable geotextile 5 and is discharged from the drain pipe.

The thermal conductivity of polyethylene insulation board is 0.028W/m·K, the strength is 400kPa, the volume water absorption rate is less than 1% (water vapor permeability coefficient is less than 2ng (Pa.ms), corrosion resistance, and stable insulation performance. The XPS board with a thickness of 20cm on the top is equivalent to In the local soil layer with a thickness of 3m, the vertical permeability coefficient of the geotextile is 3cm/s, the mass per unit area is 450g/m ² , and the tensile strength is 10kN/m.

The construction of this embodiment was completed in the autumn of 2004. After three winters of practical verification, the effect is ideal. Due to the application of new thermal insulation materials around the water collection structure and the thermal insulation effect of the top vegetation ecological restoration, the water temperature in the water collection well in winter has been greatly improved, and the water temperature has been increased by about 4-5 °C.

Claims (5)

1. A thermal insulation water collection well, consisting of a turf cover layer (1), a filling layer (2), a thermal insulation layer (3), a block stone layer (4), a permeable geotextile (5), and a water outlet (7), It is characterized in that: an insulating layer (3) is provided on the bottom of the well wall, the water outlet surface of the well head or one side of the well wall, a permeable geotextile (5) is provided on both sides or one side of the well wall, and a stone layer (4) is stacked in the well, The top of the well is a filling layer (2), the filling layer (2) has a turf covering layer (1), and the water outlet (7) is connected with an underground drainage pipe. 2. The thermal insulation collection well according to claim 1, characterized in that: the thermal insulation layer (3) adopts XPS board, and XPS is polyethylene thermal insulation board or polyurethane thermal insulation board; the thickness range is 5-20cm, and the thermal conductivity is 0.028W/m ·K; compressive strength greater than 0.3Mpa, volume water absorption less than 1%. 3. The heat preservation water collection well according to claim 1, characterized in that: the permeability coefficient of the permeable geotextile (5) is not less than 2cm/s. 4. The heat preservation water collection well according to claim 1, characterized in that: the block stone layer (4) has a particle size of 10-25 cm. 5. The heat preservation water collection well according to claim 1, characterized in that: the thickness of the filling layer (2) is 20-50 cm.

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