CN101458012B

CN101458012B - Flexible connection method between vertical heat exchanger and level header in soil source heat pump pile

Info

Publication number: CN101458012B
Application number: CN200710151004XA
Authority: CN
Inventors: 左明耀; 张新发; 张强
Original assignee: TIANJIN ZHONGLENG HEAT VENTILATION CLEAN ENGINEERING TECHNOLOGY Co Ltd
Current assignee: Tianjin Dadi Dadi energy equipment Engineering Co., Ltd.
Priority date: 2007-12-13
Filing date: 2007-12-13
Publication date: 2012-05-30
Anticipated expiration: 2027-12-13
Also published as: CN101458012A

Abstract

The invention relates to a construction method of laying a vertical ground buried pipe heat exchanger of a soil source heat pump in a building foundation pile, in particular to a structural type of an educing pipe of the buried pipe heat exchanger in the foundation pile and the construction method thereof. A method for flexibly connecting the vertical heat exchanger of the soil source heat pump in the pile and a level header is characterized in that the method comprises the following steps: 1) a flexible elbow for connecting a U-shaped pipe in the pile and the level header is prepared; 2) an enclosing box to be covered on the outside of the flexible elbow is prepared; 3) one end of the flexible elbow segment is connected with the educing pipe of the U-shaped pipe; 4) the enclosing box is installed, and the other end of the flexible elbow extends out from a lateral hole of the enclosing box and is connected with a branch pipe leading to the level header. The construction method can prevent damages and the leakage of the pipeline of the buried pipe heat exchanger in the building pile from having a negative impact on the security of the operation.

Description

Flexible connecting method in the soil source heat pump stake between vertical heat exchanger and level header

Technical field

The utility model relates to lays the soil source heat pump construction method of buried tube heat exchanger vertically in the foundation pile of building, specifically, relate to the structural shape and the construction method of the buried tube heat exchanger fairlead in the foundation pile.

Background technology

Earth source heat pump can be divided into: groundwater heat pump system, surface water source heat pump system and soil source heat pump system, and soil source heat pump system can be divided into horizontal coiled pipe and vertical two kinds of forms of pipe laying.Press the position of buried tube heat exchanger and building for vertical buried tube heat exchanger (being U type pipe) and distinguish, can be divided into again: in the building foundation base exterior pipe laying, pipe laying between building foundation pile, in building foundation pile three kinds of arrangements of pipe laying.

At present, the base exterior pipe laying is used at most in the building foundation, and the design and construction method is comparative maturity also, and other two kinds of arrangements are domestic only on probation on the only a few engineering.Find that at present ground heat exchanger pipe crack drainage has appearred in the engineering project of pipe laying in building foundation pile, has a strong impact on the normal operation of soil source heat pump system.

Former construction method is: the U type pipe in the stake is directly received on the collector of level after the upper side of pile is drawn; If sedimentation does not take place in stake; Distance between pile upper end and the level header can not change the stress that this section adapter can not be stretched so.But the inevitable sedimentation within the specific limits of actual conditions stake, and building to build up the initial stage settling amount bigger, reduce year by year subsequently, basicly stable after again, according to standard, different buildings are in its operating period, it is tens centimetres even more that foundation pile allows sedimentation.The level header position is fixed, and the decline of stake makes that one section polyethylene pipe receives tensile stress between level header and pile, and stress is crossed conference leaks pipe crack, and this promptly is a most important reason of pipe laying generation seepage.

Summary of the invention

The objective of the invention is to overcome the deficiency of prior art, design a kind of flexible tube segment syndeton.

The objective of the invention is to be achieved: the flexible connecting method in the soil source heat pump stake between vertical heat exchanger and level header through following technical scheme; Mainly may further comprise the steps:

1, the flexible elbow that make to link U type pipe and level header in the stake (because this section bend pipe is a circular arc, and is loaded on again and goes along with sb. to guard him in the case, be not restricted all around, when two ends are subjected to displacement.The pipeline of polythene material has bigger pliability, and circular arc portion can stretch, so be called flexible elbow), polyethylene pipe typically has a diameter from DN20～DN40.Its effect is: the flexible elbow of arc can be stretched when receiving tensile force, thereby significantly reduces the tensile stress that pipeline receives.

Confirm the circular arc portion length of flexible elbow, by following three parameter determining:

(1) the design maximum settlement amount of foundation pile can be found this numerical value through the design data of designing institute, is generally several centimetres to tens centimetres, and A representes with symbol.

(2) concrete is gone along with sb. to guard him the length of case, and B representes with symbol, is generally 1.5～2.5 times of stake diameters, and the stake diameter is represented with symbol D.

(3) coefficient of rich K generally gets 1.5～2.

(4) computing formula is:

(5)

(6) material of flexible elbow is identical with the interior U type pipe of nominal dimension and stake, is polyvinyl piping materials, typically has a diameter from DN20～DN40.

Be made into semicircular bend pipe according to the length blanking of above calculating flexible elbow and with straight tube.

2, make the case of going along with sb. to guard him outside the flexible elbow that covers on of concrete or steel plate, the one of which side opening, the upper and lower bottom surface of open side is semicircle; Circular diameter is identical with the diameter of stake; Open side can be close to a stake cylinder cylindrical and combine to form a cavity, and its effect is: prevent a large amount of backfill soil entering cavitys, when stake is sunk gradually and gone along with sb. to guard him the case position when motionless; Flexible elbow can freely be stretched in cavity and do not received the obstruction of reclaimed soil, and bend pipe can fracture damage.

Confirm to go along with sb. to guard him the case inside dimension:

(1) long >=1.5～2.5 times of stake diameters are represented with B in.

(2) inner width >=stake diameter D+ (5-10) millimeter.

(3) the design maximum settlement amount of height >=2 times of stakes in.

(4) to go along with sb. to guard him the thickness of case shell be 15～25mm to concrete, has certain intensity can not damaged by pressure by backfill soil and get final product.

Go along with sb. to guard him case according to the prefabricated concrete of above physical dimension.

3, an end of flexible elbow section and molten connection of the interior U type pipe fairlead electric heating of stake.Case is gone along with sb. to guard him in installation, goes along with sb. to guard him case bottom solum requirement compacting, avoids.The other end of flexible elbow stretches out from going along with sb. to guard him in the case lateral aperture, and is connected with the arm electric heating that leads to level header is molten.

5, go along with sb. to guard him around the case and the backfill and the compacting of top backfill soil.Its requirement is identical with the backfilling compaction standard at other position.

Compared with prior art; The present invention makes in the stake vertically being connected pipeline section and can in scope of design, freely extending between the exit of buried tube heat exchanger and level header; To reduce the tensile stress that pipeline possibly receive to greatest extent; Reach and prevent buried tube heat exchanger piping failure seepage in the building pile, influence purpose of safe operation.

Description of drawings

Fig. 1 is a structure vertical cut-away schematic view of the present invention; Wherein, 1 foundation pile, 2U type pipe, 3 flexible elbow, 4 level headers, 5 concrete are gone along with sb. to guard him case, 6 electrical fusion joint A, 66 electrical fusion joint B, the diameter of D stake, the design maximum settlement amount of A stake.

Fig. 2 is the I-I cross sectional plan view among Fig. 1; Wherein, 1 foundation pile, 2U type pipe, 3 flexible elbow, 4 level headers, 5 concrete are gone along with sb. to guard him case, and 6 electrical fusion joint A, 66 electrical fusion joint B, B concrete go along with sb. to guard him length in the case, the diameter of D stake.

The specific embodiment

Designing and producing and implementing below in conjunction with this flexible laying structure of description of drawings.

Referring to accompanying drawing 1, accompanying drawing 2 is buried the U type pipe 2 that polyethylene is processed underground in foundation pile 1, and level header 4 connects the spacing of several foundation piles 1 outside foundation pile 1, and to be antarafacial vertical with U type pipe 2; Concrete is gone along with sb. to guard him the side of case 5 near foundation pile 1, the flexible connecting method in the soil source heat pump stake of the present invention between vertical heat exchanger and level header; Mainly may further comprise the steps:

1, makes the flexible elbow 3 that links interior U type pipe of stake and level header, adopt polyethylene pipe, typically have a diameter from DN20～DN40; Its effect is: the flexible elbow of arc can be stretched when receiving tensile force, thereby significantly reduces the tensile stress that pipeline receives.

A) the design maximum settlement amount of foundation pile can be found this numerical value through the design data of designing institute, is generally several centimetres to tens centimetres, and A representes with symbol.

B) concrete is gone along with sb. to guard him the length of case, is generally 1.5～2.5 times of stake diameters, and B representes with symbol.

C) coefficient of rich K generally gets 1.5～2.

D) computing formula is:

e)

F) material of flexible elbow is identical with the interior U type pipe of nominal dimension and stake, is polyvinyl piping materials, typically has a diameter from DN20～DN40.

Be made into semicircular bend pipe according to the length blanking of the flexible elbow of above calculating and with straight tube.

2, make the case of going along with sb. to guard him outside the flexible elbow that covers on of concrete or steel plate, the one of which side opening, the upper and lower bottom surface of open side is semicircle; The garden diameter is identical with the diameter of stake; Open side can be close to a stake cylinder cylindrical and combine to form a cavity, and its effect is: prevent a large amount of backfill soil entering cavitys, when stake is sunk gradually and gone along with sb. to guard him the case position when motionless; Flexible elbow can freely be stretched in cavity and do not received the obstruction of reclaimed soil, and bend pipe can fracture damage.

Confirm to go along with sb. to guard him the case inside dimension:

A) long >=1.5～2.5 times of stake diameters are represented with B in.

B) inner width >=stake diameter D+ (5-10) millimeter.

C) the design maximum settlement amount of height >=2 times of stakes in.

D) to go along with sb. to guard him the thickness of case shell be 15～25mm to concrete, has certain intensity can not damaged by pressure by backfill soil and get final product.

3, an end of flexible elbow section and the molten electrical fusion joint A6 that is connected to form of the interior U type pipe fairlead electric heating of stake.

4, case is gone along with sb. to guard him in installation, goes along with sb. to guard him case bottom solum requirement compacting, avoids.The other end of flexible elbow stretches out from going along with sb. to guard him in the case lateral aperture, and with the molten electrical fusion joint B 66 that is connected to form of the arm electric heating that leads to level header 4.

Claims

1. the flexible connecting method between vertical heat exchanger and level header in the soil source heat pump stake is characterized in that, mainly may further comprise the steps:

1) makes the flexible elbow that links interior U type pipe of stake and level header;

2) make the case of going along with sb. to guard him that covers on outside the flexible elbow;

3) end of flexible elbow section is connected with the interior U type pipe fairlead of stake;

4) case is gone along with sb. to guard him in installation, and the other end of flexible elbow stretches out from going along with sb. to guard him in the case lateral aperture, and is connected with the arm that leads to level header.

2. flexibly connecting between vertical heat exchanger and level header in the soil source heat pump stake according to claim 1

Method is characterized in that, the circular arc portion length of described flexible elbow is calculated according to following formula:

K \times \sqrt{A^{2} + {(B - 1 / 2 D)}^{2}}

In the formula:

A: the design maximum settlement amount of foundation pile,

D: the stake diameter,

B: concrete is gone along with sb. to guard him the inner length of case, is generally 1.5～2.5 times of stake diameters,

K: coefficient of rich, generally get 1.5～2.

3. the flexible connecting method in the soil source heat pump stake according to claim 1 between vertical heat exchanger and level header; It is characterized in that; Described case one side opening of going along with sb. to guard him; The upper and lower bottom surface of open side is semicircle, and circular diameter is identical with the diameter of stake, and open side can be close to stake cylinder cylindrical and combine to form a cavity.

4. the vertical flexible connecting method between heat exchanger and level header in the soil source heat pump stake according to claim 3 is characterized in that, described to go along with sb. to guard him the case inside dimension following:

(1) concrete is gone along with sb. to guard him inner length >=1.5～2.5 times stake diameter of case,

(2) concrete go along with sb. to guard him case inner width >=stake diameter+5 to 10 millimeters,

(3) concrete is gone along with sb. to guard him the design maximum settlement amount of the internal height >=2 times stake of case.

5. according to the flexible connecting method between vertical heat exchanger and level header in claim 1 or the 3 described soil source heat pump stakes, it is characterized in that the described case of going along with sb. to guard him adopts concrete or steel plate to process.

6. the vertical flexible connecting method between heat exchanger and level header in the soil source heat pump stake according to claim 5 is characterized in that, when the described case of going along with sb. to guard him when adopting concrete to process, thickness is 15～25mm.

7. according to the flexible connecting method between vertical heat exchanger and level header in the described soil source heat pump stake of claim 1, it is characterized in that described flexible elbow adopts polyethylene pipe to process.

8. according to the flexible connecting method between vertical heat exchanger and level header in claim 1 or the 7 described soil source heat pump stakes, it is characterized in that the diameter of described flexible elbow is 20～40mm.

9. the flexible connecting method in the soil source heat pump stake according to claim 1 between vertical heat exchanger and level header is characterized in that, the molten connection of U type pipe fairlead employing electric heating in an end of described flexible elbow section and the stake.

10. the flexible connecting method in the soil source heat pump stake according to claim 1 between vertical heat exchanger and level header; It is characterized in that; The other end of described flexible elbow stretches out from going along with sb. to guard him in the case lateral aperture, and adopts the molten mode of electric heating to be connected with the arm that leads to level header.