阅读说明：本技术 多年冻土区杆塔基础结构、杆塔结构及施工方法 (Tower foundation structure in permafrost region, tower structure and construction method ) 是由 张晓栋 王强 万一农 孙田 赵玮 张学武 吴亚飞 田志军 徐文玺 王玉环 田升平 于 2020-06-29 设计创作，主要内容包括：本公开涉及多年冻土区杆塔基础结构、杆塔结构及施工方法,杆塔基础结构用于连接和固定杆塔,杆塔基础结构包括筒体、第一端盖、第二端盖、工质和连接结构。筒体内部沿轴向具有贯通的空腔；第一端盖设置于筒体的第一端并与筒体之间密封连接；第二端盖设置于筒体的第二端并与筒体之间密封连接,第二端盖、筒体和第一端盖共同围合形成密闭腔室；工质封闭于密闭腔室中,工质以液态和气态形式存在于密闭腔室中,工质吸收热量后能够从液态转变为气态,气态的工质在冷凝段释放热量并液化；连接结构设置于筒体的第一端,连接结构用于连接杆塔。杆塔基础结构能防止活动层冻土季节性反复冻结-融化使筒体拔出或倾斜而影响杆塔稳定。(The utility model relates to a tower foundation structure, shaft tower structure and construction method in permafrost region, tower foundation structure are used for connecting and fixed shaft tower, and tower foundation structure includes barrel, first end cover, second end cover, working medium and connection structure. A through cavity is formed in the cylinder body along the axial direction; the first end cover is arranged at the first end of the cylinder body and is in sealing connection with the cylinder body; the second end cover is arranged at the second end of the cylinder body and is in sealing connection with the cylinder body, and the second end cover, the cylinder body and the first end cover jointly enclose to form a closed chamber; the working medium is sealed in the closed chamber, the working medium exists in the closed chamber in a liquid state and a gaseous state, the working medium can be converted into a gaseous state from the liquid state after absorbing heat, and the gaseous working medium releases heat and is liquefied in the condensation section; the connecting structure is arranged at the first end of the barrel and used for connecting a tower. The tower foundation structure can prevent the stability of the tower from being influenced by the fact that the barrel is pulled out or inclined due to seasonal repeated freezing-melting of the frozen soil of the movable layer.)

1. A pole tower foundation structure, characterized in that, pole tower foundation structure is used for connecting and fixed shaft tower, pole tower foundation structure includes:

the cylinder body is internally provided with a through cavity along the axial direction;

the first end cover is arranged at the first end of the cylinder body and is in sealing connection with the cylinder body;

the second end cover is arranged at the second end of the cylinder body and is in sealing connection with the cylinder body, and the second end cover, the cylinder body and the first end cover jointly enclose to form a closed cavity;

the working medium is sealed in the closed chamber, the working medium exists in the closed chamber in a liquid state and a gaseous state, the working medium can be converted into a gaseous state from a liquid state after absorbing heat, and the gaseous working medium can release heat and be liquefied when contacting the inner wall of the cylinder; and

and the connecting structure is arranged at the first end of the cylinder body and is used for connecting the tower.

2. The tower substructure of claim 1, wherein the connection structure is secured to a circumferential surface of the drum.

3. Tower infrastructure according to claim 2, wherein said connection structure is a flange, said flange having a predetermined distance from the end face of said first end.

4. The tower foundation structure of claim 3, wherein a reinforcing rib plate is arranged between the flange plate and the cylinder body.

5. The tower foundation structure of any one of claims 1-4, further comprising a heat dissipation structure disposed at the outer periphery of the cylinder and located at the first end side of the cylinder.

6. Tower infrastructure according to claim 5, wherein the heat dissipating structures are heat dissipating fins.

7. The tower foundation structure of claim 1, further comprising a metal outer sleeve, wherein the inner diameter of the metal outer sleeve is consistent with the outer diameter of the cylinder, and the metal outer sleeve is detachably sleeved outside the cylinder.

8. A pole tower structure comprises a pole tower section and a foundation section, and is characterized in that the foundation section is the pole tower foundation structure as claimed in any one of claims 1 to 7, and the pole tower section is coaxially and fixedly connected with the pole tower foundation structure through the connecting structure.

9. The tower construction of claim 8 wherein a layer of insulation is provided between the tower section and the tower base structure.

10. A tower foundation structure construction method for burying the tower foundation structure according to any one of claims 1 to 5 in a permafrost region, comprising:

drilling a foundation hole to obtain a foundation hole, wherein the hole diameter of the foundation hole is smaller than the diameter of the tower foundation structure, and the foundation hole enters a permafrost layer;

pressing the tower foundation structure into the base hole to enable the second end of the tower foundation structure to be in contact with the bottom of the base hole.

Technical Field

The disclosure relates to the technical field of electric power tower foundations and electrified railway contact network strut foundations, in particular to a tower foundation structure in a permafrost region, a tower structure and a construction method.

Background

The pole tower is used for supporting the support of the transmission line in the overhead transmission line, and the contact net support column is a supporting structure for the contact suspension of the electrified railway. The towers and the contact net support columns are mostly steel structures or prestressed reinforced concrete structures. In plateau permafrost regions, the upper frozen earth (active layer) is an unstable earth body that is extremely sensitive to climate and temperature changes. Under the external influence of climate change, human factors and the like, the frozen soil is redistributed in a temperature field after being thermally disturbed, repeated freeze thawing occurs, and the tower foundation in a frozen soil area can be seriously deformed to incline or even collapse. Therefore, the frozen soil temperature field under the tower foundation has a significant influence on the bearing capacity of the tower pile, and has been paid more and more attention.

In the construction of the tower foundation in the frozen soil area, the cast-in-situ bored pile becomes the most common foundation form of the tower foundation of the power transmission line due to the advantages of high bearing capacity, wide applicability, simple construction method and the like. In a frozen soil area, the disturbance of the construction of the cast-in-situ bored pile on the frozen soil has great influence, the soil body on the side of the pile has long time of refreezing, and the hydration heat of the concrete is the most main source of thermal disturbance. Therefore, it is necessary to deeply study the thermal disturbance problem of the tower pile in the frozen soil area.

Disclosure of Invention

In order to solve the technical problems or at least partially solve the technical problems, the present disclosure provides a tower foundation structure in a permafrost region, a tower structure and a construction method.

According to the first aspect, the tower foundation structure is used for connecting and fixing towers and comprises a barrel, a first end cover, a second end cover, working media and a connecting structure. A through cavity is formed in the cylinder body along the axial direction; the first end cover is arranged at the first end of the cylinder body and is in sealing connection with the cylinder body; the second end cover is arranged at the second end of the cylinder body and is in sealing connection with the cylinder body, and the second end cover, the cylinder body and the first end cover jointly enclose to form a closed chamber; the working medium is sealed in the closed chamber, the working medium exists in the closed chamber in a liquid state and a gaseous state, the working medium can be converted from the liquid state into the gaseous state after absorbing heat, and the gaseous working medium can release heat and be liquefied when contacting the inner wall of the cylinder; the connecting structure is arranged at the first end of the barrel and used for connecting a tower.

In a first possible implementation, the connection structure is fixed to the circumferential surface of the cylinder.

With reference to the foregoing possible implementation manner, in a second possible implementation manner, the connection structure is a flange, and the flange has a predetermined distance from the end surface of the first end.

In combination with the above possible implementation manners, in a third possible implementation manner, a reinforcing rib plate is arranged between the flange plate and the cylinder body.

With reference to the foregoing possible implementation manners, in a fourth possible implementation manner, the heat dissipation device further includes a heat dissipation structure, and the heat dissipation structure is disposed on the outer periphery of the cylinder and located at the first end side of the cylinder.

With reference to the foregoing possible implementation manners, in a fifth possible implementation manner, the heat dissipation structure is a heat dissipation fin.

In combination with the above possible implementation manners, in a sixth possible implementation manner, the barrel further includes a metal outer sleeve, an inner diameter of the metal outer sleeve is consistent with an outer diameter of the barrel, and the metal outer sleeve is detachably sleeved outside the barrel.

In a second aspect, a tower structure is provided, which includes a tower segment and a foundation segment, wherein the foundation segment is the tower foundation structure described in any one of the first aspect, and the tower segment is coaxially and fixedly connected with the tower foundation structure through a connecting structure.

In a first possible implementation, a heat insulation layer is arranged between the tower segment and the tower foundation structure.

In a third aspect, a method for constructing a tower foundation structure is provided, where the tower foundation structure described in any one of the first aspects is buried in a permafrost region, and the method includes the following steps: drilling a hole on the foundation to obtain a base hole, wherein the aperture of the base hole is smaller than the diameter of the tower foundation structure, and the base hole enters the permafrost layer; and pressing the tower foundation structure into the base hole to enable the second end of the tower foundation structure to be in contact with the bottom of the base hole.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages: working medium in the barrel makes the barrel constantly absorb heat and upwards transmit from the seasonality frozen soil layer, can make barrel and frozen soil around the barrel keep lower temperature, prevents that frozen soil from melting, therefore can not have the frost heaving phenomenon again, can not take place to incline or by the phenomenon of upwards "hunch out" because of repeated expansion process messenger barrel.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic view of a tower foundation structure according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of the basic structure of the tower of FIG. 1;

FIG. 3 is a schematic view of an application scenario of the tower infrastructure of FIG. 1;

fig. 4 is a view a-a of fig. 3.

Wherein, 100-cylinder, 110-first end, 120-second end; 200-a first end cap, 210-a reinforcing rib; 300-a second end cap; 400-a connecting structure; 500-a heat dissipation structure; 600-pole tower section; 700-working medium, 710-gaseous working medium, 720-liquid working medium; a-seasonal frozen soil layer, b-perennial frozen soil layer.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

The tower foundation structure main part that this disclosure provided is a both ends seal and inclosed barrel, fills into working medium in the airtight cavity of barrel inside. Working medium exists in the airtight chamber with liquid and gaseous state form, can change from liquid state into gaseous state after working medium absorbs the heat, and gaseous working medium can release the heat and liquefy when the contact of barrel inner wall. When the device is used, the cylinder body is vertically arranged, the lower section of the cylinder body is embedded below a frozen soil layer, and the liquid working medium is always positioned at the lower end under the action of gravity. The upper end of the cylinder body is provided with a section which is arranged above the frozen soil layer, so that heat can be well dissipated to the outside. The top end of the cylinder body is provided with a connecting structure for connecting a tower. The tower foundation structure with the structure can transfer heat in the frozen soil layer to the top end of the cylinder body and disperse the heat to the surrounding environment by utilizing the heat absorption and release phenomena of the working medium in the gas-liquid two-state conversion process. The barrel can be of a metal structure, so that the barrel can have enough strength to support the tower without a large cross-sectional area (such as 350mm), and only the hole diameter equivalent to the diameter of the tower foundation structure needs to be excavated in the construction process of installing the tower foundation structure, so that a large hole/pit does not need to be excavated, and the influence on the permafrost layer temperature field is reduced.

Referring to fig. 1 to 4, fig. 1 is a schematic diagram of a tower foundation structure in an embodiment of the present disclosure, fig. 2 is a schematic cross-sectional diagram of the tower foundation structure in fig. 1, fig. 3 is a schematic diagram of an application scenario of the tower foundation structure in fig. 1, and fig. 4 is a view a-a in fig. 3.

The pole tower foundation structure is used for connecting and fixing the pole tower 600, and the pole tower 600 can be used for supporting power lines such as a contact net.

The tower foundation structure comprises a cylinder body 100, a first end cover 200, a second end cover 300, a connecting structure 400, a heat dissipation structure 500 and working media 700. The cylinder 100 can be made of seamless steel pipe, and the material can be Q235, which can make the cylinder 100 have larger strength. The interior of the cylinder 100 is a hollow space extending therethrough in the axial direction. And carrying out penetration detection on the outer surface of the welding seam of the steel pipe shell. The outer diameter of the cylinder 100 is 350 mm. The first end cap 200 is disposed at the first end 110 of the cylinder 100, and is hermetically connected thereto. Specifically, the outer circumference of the first end cap 200 may be provided with an external thread, and the inner wall of the cylinder 100 may be provided with an internal thread, so that the first end cap and the cylinder are connected in a sealing manner through the threads. The first end cap 200 may be welded directly to the first end 110, so that the strength is maintained and the sealing performance is stable. The second end cap 300 is disposed at the second end 120 of the cartridge body 100, and is sealingly coupled therebetween. Specifically, the outer circumferential surface of the second end cap 300 may be provided with external threads, and the inner wall of the cylinder 100 may be provided with internal threads, so that the sealing connection may be achieved through the threads. The second end cap 300 may be welded directly to the first end 110, so that the strength is maintained and the sealing performance is stable.

The cylinder 100, the first end cap 200 and the second end cap 300 together enclose a closed chamber. Working medium 700 is arranged in the closed cavity. The working medium 700 may be liquid nitrogen or liquid carbon dioxide, and the working medium 700 may have two existing forms, namely a gaseous working medium 710 and a liquid working medium 720, in the cylinder 100. When the cylinder 100 is vertically arranged, the working medium 700 is located at the lowest part, and after heat is absorbed from the outside through the pipe wall of the cylinder 100, part of the working medium can be evaporated to form a gaseous working medium 710. The gaseous working medium 710 rises to the first end 110 side of the closed chamber along the chamber, and contacts with the tube wall of the cylinder 100 to release heat and condense into a liquid working medium 720. The liquid working medium 720 flows along the pipe wall to the lowest part and can be gasified and ascended again after absorbing heat. The above process is continuously circulated, and the lower portion of the drum 100 can be maintained at a low temperature. The heat absorbed by the tube walls of the cartridge 100 may be dissipated to the environment.

The connection structure 400 is disposed at the first end 110 of the barrel 100 for connecting to a tower. In this embodiment, the connecting structure 400 is a flange. The flange plate is sleeved on the outer peripheral surface of the cylinder body 100 and is fixedly connected with the cylinder body 100 in a welding way. The flange is a predetermined distance from the end face of the first end 110. In theory, the first end cap 200 may be integrated with the connection structure 400, that is, a circular disk with a diameter larger than the outer diameter of the cylinder 100 is concentrically welded to the end face of the cylinder 100, so as to achieve the functions of sealing the cylinder 100 and connecting the tower. The connection structure 400 is a stressed member, and can bear the weight of the tower and the overturning moment of the tower, so that the interior of the connection structure can be stressed. The connecting structure 400 is welded to the cylinder 100, and the cylinder 100 is also subjected to the above-mentioned stress. In the present disclosure, after a predetermined distance is provided between the connection structure 400 and the first end cap 200, the influence of stress on the weld between the first end cap 200 and the cylinder 100 can be reduced. In addition, in some processes, the connection structure 400 is firstly welded on the cylinder 100, and then the connection hole is processed, and the first end cap 200 and the connection structure 400 are in a split form, so that the influence of the cutter action in the processing process on the welding line of the first end cap 200 can be avoided.

A plurality of reinforcing ribs 210 are further disposed between the connection structure 400 and the circumferential surface of the cylinder 100, and the reinforcing ribs 210 can increase the strength of the connection structure 400. Moreover, the reinforcing ribs 210 are positioned at the first end 110 side of the tower foundation structure, so that the overall surface area of the tower foundation structure can be increased, which is equivalent to the increase of the heat dissipation surface area.

The heat dissipation structure 500 is a plurality of heat dissipation fins, which are located on the surface of the cylinder 100 near the first end 110. The radiating fins are rectangular metal plates and are arranged along the generatrix of the cylinder body 100, and a plurality of radiating fins are arranged around the circumferential surface of the cylinder body 100. In some alternative embodiments, the heat dissipation fins may be in contact with and welded to the connection structure 400, which may increase the strength of the connection structure 400. In alternative embodiments, the heat dissipation structure 500 may also be in other forms, such as spiral fins around the surface of the cylinder 100. In other alternative embodiments, no heat dissipation structure may be provided, and only the surface of the cylinder 100 may be used for heat dissipation.

The frozen soil layer comprises a seasonal frozen soil layer a and a perennial frozen soil layer b, the seasonal frozen soil layer a can be repeatedly frozen and thawed due to temperature change, and the perennial frozen soil layer b can be kept in a frozen state throughout the year. When the pole tower foundation structure is installed in place, the second end 120 of the cylinder body 100 is located in the permafrost layer b, the cylinder body 100 and the permafrost layer b are frozen into a whole, and stable anchoring can be achieved.

The soil expands during freezing, the acting force on the cylinder body 100 in the expansion process generates lateral acting force on the cylinder body 100, and if frozen soil is frozen and thawed repeatedly, the cylinder body 100 is inclined or is upwards arched out through the repeated expansion process. By using the tower foundation structure provided by the disclosure, the working medium 700 in the cylinder body 100 enables the cylinder body 100 to continuously absorb heat from the seasonal frozen soil layer a and transmit the heat upwards, so that the temperature of the cylinder body 100 and the frozen soil around the cylinder body can be kept low, the frozen soil is prevented from melting, and the frost heaving phenomenon can not occur.

The tower structure provided by the present disclosure includes a tower section 600 and the tower foundation structure in the foregoing embodiments, and the tower section 600 is fixedly connected to the connection structure 400 in the tower foundation structure. The tower section 600 is a metal tower, and has a base, such as a flange, at the bottom that is adapted to the connection structure 400 and is fixedly connected by a plurality of sets of bolts. A thermal insulation layer/pad may also be provided between the tower section 600 and the connection structure 400 to prevent heat of the tower section 600 from being transferred downward.

During construction, the tower foundation structure can be fixed in the frozen soil according to the following construction method.

And drilling a hole on the foundation to obtain a base hole, wherein the aperture of the base hole is smaller than the diameter of the tower foundation structure, and the base hole enters the permafrost layer. If the diameter of the cylinder in the tower foundation structure is 350mm, the aperture of the base hole can be set to be 330 mm. And pressing the tower foundation structure into the base hole to enable the second end of the tower foundation structure to be in contact with the bottom of the base hole. The bottom of the tower foundation structure can be provided with a chamfer or a fillet so as to guide the barrel in the pressing-in process.

By adopting the method to install the tower foundation structure, no gap exists between the foundation hole and the tower foundation structure, fine sand, mortar or concrete does not need to be backfilled, no water or hydration heat releases heat, and the influence on the temperature field of the permafrost layer is small. The tower foundation structure of traditional reinforced concrete material is bulky, need dig very big pot hole earlier during the construction, and is great to the temperature field influence on many years frozen soil layer, and the concrete hydration is exothermic can produce bigger influence to frozen soil on every side. For the construction of the tower foundation structure of traditional reinforced concrete material, the construction of the tower foundation structure of the present disclosure is simpler, and after the drilling by using the drilling machine is finished, the finished product is directly pressed into the base hole.

In some embodiments, the tower base structure further includes a metal outer sleeve (not shown), an inner diameter of the metal outer sleeve is consistent with an outer diameter of the cylinder, and the metal outer sleeve is detachably sleeved outside the cylinder. During construction, a base hole with the outer diameter slightly smaller than that of the metal outer sleeve is drilled first, and then the metal outer sleeve is pressed into the base hole. And after the metal outer sleeve is in place, the detachable sealing cover is taken out of the metal outer sleeve, and then the cylinder body of the tower foundation structure is inserted into the metal outer sleeve. The structure and the method do not need to directly apply pressure to the cylinder of the tower foundation structure, and can prevent the cylinder from being damaged.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.