CN220769631U - Prefabricated concrete double-truss fan lifting base - Google Patents

Abstract

The utility model relates to a prefabricated concrete double-truss fan lifting base which comprises a lower foundation, a double-truss structure and a top bearing platform which are sequentially connected from bottom to top, wherein the double-truss structure is a conical stable structure formed by connecting reinforced concrete square columns and reinforced concrete square beams and is divided into an inner truss structure and an outer truss structure. The structure is one of truss structures, the structure takes a reinforced concrete square column as a main body stressed structure, is effectively connected through a reinforced concrete beam, forms a concrete double-truss conical structure with stable structure, and is connected with a fan steel tower or a concrete tower through a top bearing platform at the upper part and a bottom foundation at the lower part. Because the rigidity of the self is larger, a part of steel tower drum or concrete tower drum at the bottom section can be replaced, so that the rigidity of the whole structure is improved, the conical structure can disperse upper load along the main body stress structure, the disadvantage that the traditional foundation is diffused from the central point to the periphery is avoided, and the cost can be effectively saved.

Description

Prefabricated concrete double-truss fan lifting base

Technical Field

The utility model relates to the technical field of basic building structures, in particular to a preassembled concrete double-truss fan lifting base.

Background

The wind power industry develops rapidly, the loading capacity is high continuously, and the traditional steel tower cylinder gradually cannot keep pace with the rapid development of the wind power industry due to the relative flexibility of rigidity. However, the fan tower must break through the limitation of height continuously to obtain more wind resources, and a novel fan tower structure with relatively high rigidity and low cost is urgently needed. The truss structure has a certain taper, has higher relative rigidity, can be combined with the steel tower barrel to install the fan blade to a higher height, and is usually in a main structure of steel pipes, and the truss structure is convenient to connect and has higher rigidity, but has high manufacturing cost and needs to be further optimized.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide the preassembled concrete double-truss fan lifting base which is suitable for supporting the connection and fixation of a fan tower, and further improves the stability of the fan tower structure.

The above object of the present utility model is achieved by the following technical solutions:

the utility model provides a base is raised to two truss fans of pre-installation concrete, includes lower part basis, two truss structure and the top cushion cap that connect gradually from bottom to top, two truss structure is by reinforced concrete square column, reinforced concrete square beam connection constituteed toper stable structure, divide into inside truss structure and outside truss structure.

The present utility model may be further configured in a preferred example to: the reinforced concrete square columns are divided into inclined columns and upright columns due to different position distribution and section sizes, and the reinforced concrete square beams are divided into a No. 1 beam, a No. 2 beam, a No. 3 beam, a No. 4 beam and a No. 5 beam.

The present utility model may be further configured in a preferred example to: the inclined column is an externally inclined reinforced concrete square column, and the bottom distribution diameter of the inclined column is larger than the top distribution diameter of the inclined column and is radially and uniformly distributed.

The present utility model may be further configured in a preferred example to: the stand is inside vertical reinforced concrete square column, from top to bottom distributes the diameter the same, and the diameter with the top of inclined column distributes the diameter the same, namely the inclined column with the top of stand distributes on the circular arc of same diameter, inclined column evenly distributed, the stand interval distributes in the middle of the inclined column.

The present utility model may be further configured in a preferred example to: the inclined column and the column are internally provided with tensioning prestressed steel strands, the reinforced concrete square column is pre-buried with steel pipes with proper diameters and wall thicknesses to form a reserved channel for the prestressed steel strands during prefabrication, and concrete is poured and filled after the post-tensioning prestressed steel strands are tensioned.

The present utility model may be further configured in a preferred example to: the upright posts are connected with the No. 1 beam and the No. 2 beam to form the internal truss structure, wherein the upright posts are of a main stress structure, the No. 1 beam is a cross beam connected with adjacent upright posts, and the No. 2 beam is a cross beam connected with the adjacent upright posts;

the inclined columns are connected with the No. 4 beams to form the external truss structure, wherein the inclined columns are main stress structures, the No. 4 beams are cross beams connected with adjacent inclined columns, and no cross beam is designed between the adjacent inclined columns;

the cross beam between the inner truss and the outer truss is a No. 3 beam, a cross beam is not designed, the inner end of the No. 3 beam is connected with the upright post of the inner truss, and the outer end of the No. 3 beam is connected with the inclined post of the outer truss;

the No. 5 beam is positioned between the bottom of the double truss structure and the connecting bearing platform connected with the lower foundation and is a cross beam.

The present utility model may be further configured in a preferred example to: the No. 1 beam is a cross beam connected with the upright post, the prefabricated end of the cross beam is integrally prefabricated with the upright post, the section of the secondary pouring is made into a special-shaped section, and a reinforcing steel bar with a certain length extends outwards;

the beam No. 2, the beam No. 3 and the beam No. 4 are cross beams between the inclined column and the upright column, the prefabricated ends of the cross beams are prefabricated with the inclined column or the upright column, the section of the secondary pouring is embedded with the section steel, and the section steel extends outwards for a certain length;

the No. 5 beam is positioned at the connecting bearing platform part of the lower foundation, the prefabricated end of the No. 5 beam is integrally prefabricated with the connecting bearing platform, the section of the secondary pouring is made into a special-shaped section, and the special-shaped section extends outwards to form a reinforcing steel bar with a certain length.

The present utility model may be further configured in a preferred example to: the bottom of the double truss structure is connected with a connection bearing platform of the foundation, and the top of the double truss structure is connected with a top bearing platform.

The present utility model may be further configured in a preferred example to: when the upright post needs to be prefabricated in a segmented mode, the upright post is divided into an upper prefabricated post and a lower prefabricated post, the connecting end of the upright post is divided into a lower inserting end and an upper inserting end, square steel plates are arranged at the lower inserting end and the upper inserting end, one end of a construction rib of the upper inserting end penetrates out of the square steel plates, and an upper steel cap is arranged outside the upper inserting end;

the construction rib of lower grafting end and steel sleeve screw-thread fastening, steel sleeve one end reserve certain length, with the upper grafting end stretches out the length of construction rib corresponding, steel sleeve with square steel sheet junction surface flushes, and the outside of lower upper grafting end is equipped with down the steel cap.

The present utility model may be further configured in a preferred example to: the double truss structure comprises a first layer of cross beam, a second layer of cross beam, a third layer of cross beam and a fourth layer of cross beam, wherein the area of the first layer of cross beam, the area of the second layer of cross beam, the area of the third layer of cross beam and the area of the fourth layer of cross beam are sequentially reduced from bottom to top.

In summary, the present utility model includes at least one of the following beneficial technical effects:

the utility model discloses a prefabricated concrete double-truss fan lifting base which is one of truss structures, wherein reinforced concrete square columns are used as main body stressed structures, the reinforced concrete square columns are effectively connected through reinforced concrete beams to form a concrete double-truss conical structure with a stable structure, the upper part of the concrete double-truss conical structure is connected with a fan steel tower or a concrete tower through a top bearing platform, and the lower part of the concrete double-truss conical structure is connected with a bottom foundation. The base is raised to two truss fans of pre-installation formula concrete can replace a part of steel tower section of thick bamboo or concrete tower section of thick bamboo at the bottom because of self rigidity is great to improve overall structure's rigidity, toper structure can be with upper portion load along main part atress structure dispersion, avoided traditional basis to the disadvantage of diffusion all around by the central point, can effectively practice thrift the cost, satisfy the continuous upgrading demand of wind-powered electricity generation trade.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic diagram showing the connection of adjacent diagonal columns according to the present utility model.

Fig. 3 is a schematic plan view showing the first layer beam and the second layer beam according to the present utility model.

Fig. 4 is a schematic plan view showing a third layer of beams, a fourth layer of beams and a column top according to the present utility model.

Fig. 5 is a detailed connection diagram of points 1-5 of fig. 1.

FIG. 6 is a schematic diagram of a field junction;

FIG. 7 is a detail connection diagram of points 11 and 12 of FIG. 6;

FIG. 8 is a plan view of a beam-slab composite foundation;

fig. 9 is a bar graph of the floor and bar beam of fig. 8.

Reference numerals: 1. a lower foundation; 2. a double truss structure; 3. and a top bearing platform.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; it is apparent that the described embodiments are only a part of the embodiments of the present application, not all of the embodiments, and all other embodiments obtained by a person having ordinary skill in the art without making creative efforts based on the embodiments in the present application are within the scope of protection of the present application.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Embodiment one:

referring to fig. 1 to 9, the prefabricated concrete double truss fan lifting base disclosed by the utility model comprises a lower foundation 1 (taking a beam-slab type combined foundation as an example), a double truss structure 2 and a top bearing platform 3 (taking a steel tower as an example) which are connected from bottom to top in sequence.

As shown in fig. 1 and 2, the double truss structure 2 is a conical stable structure formed by connecting reinforced concrete square columns and reinforced concrete square beams, and is divided into an inner truss structure and an outer truss structure. The reinforced concrete square columns are divided into inclined columns and upright columns due to different position distribution and section sizes, and the reinforced concrete square beams are divided into a No. 1 beam, a No. 2 beam, a No. 3 beam, a No. 4 beam and a No. 5 beam.

The inclined column is an externally inclined reinforced concrete square column, the bottom distribution diameter of the inclined column is larger than the top distribution diameter, and specifically, the bottom distribution diameter is larger, the top distribution diameter is smaller, the inclined column is radially and uniformly distributed, and the section size and the number are preferable.

The stand is inside vertical reinforced concrete square column, and upper and lower distribution diameter is the same, and the diameter is the same with the top distribution diameter of batter post, and the top of batter post and stand distributes on the circular arc of same diameter promptly, and batter post evenly distributed, stand interval distribution are in the middle of the batter post, and stand cross-section size and quantity are preferred.

The inclined column and the upright column are prefabricated in a factory, tensioning prestressed steel strands are designed in the inclined column and the upright column, channels are reserved for the prestressed steel strands through pre-burying steel pipes with proper diameters and wall thicknesses when the reinforced concrete square column is prefabricated, and concrete is poured and filled after the later-period prestressed steel strands are tensioned.

The upright posts are connected with the No. 1 beam and the No. 2 beam to form an internal truss structure, wherein the upright posts are main stressed structures, the No. 1 beam is a cross beam for connecting adjacent upright posts, and the No. 2 beam is a cross beam for connecting adjacent upright posts. In the schematic diagram: the number of the upright posts is 4; the No. 1 beam is distributed in four layers, and each layer is provided with 8 beams; the number 2 beams are distributed into three layers, and each layer is provided with 4 beams.

The inclined columns are connected with the No. 4 beams to form an external truss structure, wherein the inclined columns are main stress structures, the No. 4 beams are cross beams connected with adjacent inclined columns, and no cross beam is designed between the adjacent inclined columns. In the schematic diagram: the number of the inclined columns is 8; the number 4 beams are distributed in three layers, and each layer is provided with 8 beams.

The crossbeam between inside truss and the outside truss is No. 3 roof beam, does not design the cross beam, and the stand of inside truss is connected to No. 3 roof beam inner end, and the inclined column of outside truss is connected to the outer end. In the schematic diagram: the No. 3 beam is distributed with three layers, each layer is provided with 8 beams, and one upright post is correspondingly connected with two inclined posts through the No. 3 beams.

The No. 5 beam is positioned between the bottom of the double truss structure 2 and the connecting bearing platform connected with the lower foundation 1 and is a cross beam. In the schematic diagram: and a layer of beams 5 are distributed, and 20 beams are taken as a total.

As in fig. 3 and 4: the double truss structure 2 comprises a first layer of cross beam, a second layer of cross beam, a third layer of cross beam and a fourth layer of cross beam which are sequentially reduced in area from bottom to top, wherein the first layer of cross beam, the second layer of cross beam, the third layer of cross beam and the fourth layer of cross beam are all horizontally arranged.

Specifically, as shown in fig. 3 and fig. 4, the first layer is a horizontal plane at the midpoint of the connection bearing platform, and comprises inclined columns, upright columns, the connection bearing platform and a No. 5 beam; the second, third and fourth layers are horizontal planes of the middle point of the air cross beam, the upward diameter of the air cross beam is gradually reduced, and each layer comprises an inclined column, an upright column, a No. 2 beam, a No. 3 beam and a No. 4 beam; the fifth layer is a horizontal plane at the midpoint of the top surface of the column, and comprises inclined columns, upright columns, a top bearing platform 3 and a No. 1 beam.

It can be found from the layered graph that the included angle between the No. 3 beam and the inclined column as well as the vertical column gradually changes along with the change of the height. Therefore, when the prefabricated end of the beam and the inclined column are integrally prefabricated, the connection is required to be strictly according to the angle, so that the precision requirement of later field connection can be ensured.

As shown in fig. 6 and 7, for the overall structure, the middle parts of all beams are designed as site connection nodes, and secondary pouring is performed by binding reinforcing steel bars or connecting section steel on site. Because of the stress characteristic of the beam in the integral structure, the bending moment in the middle of the beam is smaller, and the bending moment at the two ends is larger. Therefore, the middle part of the beam is designed to be a site connection secondary pouring position, and the beam consists of prefabricated ends at two ends and a secondary pouring position in the middle. The prefabricated ends of the two ends are prefabricated integrally with the respective associated diagonal columns or uprights and require an increased cross-sectional size.

The beam 1 is a cross beam connected with the upright post, the prefabricated end of the cross beam is integrally prefabricated with the upright post, the section of the secondary pouring is made into a special-shaped section, and the special-shaped section extends outwards to form a reinforcing steel bar with a certain length. Binding the stretched steel bars in the process of on-site connection, staggering the structural bars, hanging the pouring template at the beam prefabrication end after the steel bar cage is completed, and removing the template after secondary pouring and reaching the qualified strength.

Point detail view No. 12 as shown in fig. 7: the beams No. 2, no. 3 and No. 4 are beams between the inclined columns and the upright columns, the prefabricated ends of the beams are prefabricated with the inclined columns or the upright columns, section embedded section steel for secondary pouring is arranged, and reinforcing steel bars with certain length extend outwards. When in field connection, the section steel is fixedly connected by bolts, the requirement that the concrete of the secondary pouring position in the construction stage and the later stage does not reach the strength requirement before the qualified strength is met, meanwhile, a reinforcement cage is required to be bound outside, after the reinforcement cage is completed, a pouring template is hung at the precast end of the beam, and the template is removed after the secondary pouring reaches the qualified strength.

The No. 5 beam is positioned at the connecting bearing platform part of the lower foundation 1, the prefabricated end of the No. 5 beam is integrally prefabricated with the connecting bearing platform, the section of the secondary pouring is made into a special-shaped section, and the special-shaped section extends outwards to form a reinforcing steel bar with a certain length. And during field connection, binding a reinforcement cage of the beam body, and then performing secondary pouring.

The bottom of the double truss structure 2 is connected with a connection bearing platform of a foundation, and the top of the double truss structure 2 is connected with a top bearing platform 3. When the design height of the double truss exceeds the transportation limit, the square column needs to be prefabricated in a segmented mode, and column connection treatment is carried out on site.

The square column and the connection bearing platform at the lower part are integrally prefabricated, and the cross section size of the connection bearing platform is larger than that of the square column, so that the connection bearing platform is prefabricated by adopting transition treatment of an inclined plane, and the stress is more reasonable.

The end position of the square column connected with the top bearing platform 3 is required to stretch out a reinforcing steel bar construction rib with a certain length, and concrete within a certain length range of the connecting end is subjected to rough treatment, so that the column end anchored into the top bearing platform 3 can bear load together with the concrete secondarily poured on the top bearing platform 3, and the connection between the column and the bearing platform meets the connection requirement of the standard middle pile and the bearing platform.

As shown in the point 11 detail diagram of fig. 7: when the upright post needs to be prefabricated in a segmented mode, the end portion prefabrication is slightly different, so that the on-site post connection treatment is facilitated. The stand is divided into prefabricated post and lower prefabricated post, and the link of stand is divided into lower grafting end and last grafting end, and square steel sheet is all installed to lower grafting end and last grafting end, and square steel sheet carries out laser accurate cutting according to structure muscle diameter and distribution form, carries out the accurate location to the structure muscle. One end of the structural rib of the upper plug-in end penetrates out of the square steel plate, an upper steel cap is arranged outside the upper plug-in end, and the upper steel cap can play a role in protecting the extended structural rib and positioning during later connection.

The construction rib of lower grafting end and steel sleeve screw-thread fastening, steel sleeve one end reserve certain length, correspond with the length that upper grafting end stretches out the construction rib, steel sleeve flushes with square steel sheet junction surface, and the outside of lower upper grafting end is equipped with down the steel cap, and the size of steel cap is slightly less than last steel cap down.

When the posts are connected on site, the two posts are correspondingly fixed, the reserved holes of the steel sleeve at the lower inserted end are filled with structural adhesive, then the structural ribs at the upper inserted end are correspondingly connected with the steel sleeve by gravity or external force, and the structural adhesive is further fastened through bolts at the cap peak of the large and small steel caps until the structure is gelled and fixed. The method for connecting the column is a bonding steel connecting bar connecting method, which has already applied for national patents, and the patent publication number is:

CN116180903a, details of which are shown in the method of connecting reinforced concrete prefabricated parts and bonded steel bars.

The top bearing platform 3 is a hollow bearing platform cast in situ, and is in a reinforced concrete conical hollow structure when being connected with the steel tower, and is upwards connected with the steel tower through a pre-buried double-row high-strength bolt cage.

The bottom foundation adopts beam slab type combined foundation, utilizes the shaped steel of every connection cushion cap lower part to connect a square steel sheet that cross-section size is great downwards to one side, and square steel sheet bottom utilizes rag bolt to fix on the bed course, upwards supports the installation and the equipment of two truss prefabricated parts, and later stage foundation carries out the steel reinforcement cage ligature to with the joint ligature of the reinforcing bar that stretches out in connection cushion cap bottom, wholly accomplishes and pours.

The prefabricated concrete double-truss fan lifting base takes a reinforced concrete square column as a main body structure, is effectively connected into a whole in a secondary pouring connection mode, has larger taper and rigidity compared with a steel tower cylinder, has larger rigidity and economic cost compared with a steel pipe type or angle steel truss, and also has larger horizontal load resistance and bending moment resistance bearing capacity. The conical structure can disperse upper load along the main body stress structure, avoids the disadvantage that the traditional foundation is diffused from the central point to the periphery, can effectively save cost, and meets the continuous upgrading requirement of the wind power industry. Therefore, the preassembled concrete double-truss fan lifting base is more suitable for the development of the future wind power industry, can meet the requirements of owners and first parties in terms of cost, and can also meet the requirements of design parties and owners in terms of safety.

When the concrete tower is connected, the concrete tower is a reinforced concrete annular bearing platform, holes are reserved at the inner annular edge, and a lower anchoring disc is used for the prestressed steel strand outside the concrete tower.

The lower foundation 1 is selected into different foundation forms according to different geological conditions, and mainly comprises two foundation forms, namely a beam-slab combined foundation applied to medium-hardness soil and a pile-ring beam combined foundation applied to weak geology.

When two foundation forms are connected with each square column of the upper double-truss structure 2, a connecting bearing platform is needed, the section size of the connecting bearing platform is larger than that of the square column, the connecting bearing platform and the square column are prefabricated integrally, the bottom of the connecting bearing platform extends outwards to form a reinforcing steel bar and a section steel with a certain length, and the reinforcing steel bar or the section steel is bound and welded with a reinforcing steel bar cage of a later foundation to form a whole.

When the beam plate type combined foundation is adopted as the bottom foundation, the section steel of the lower part of each connecting bearing platform is utilized to be obliquely downwards connected with a square steel plate with larger section size, the bottom of the square steel plate is fixed on a cushion layer by utilizing foundation bolts, the installation and the assembly of the double-truss prefabricated part are upwards supported, the later-stage foundation is bound by a reinforcement cage, and the later-stage foundation and the reinforcement extending out of the bottom of the connecting bearing platform are bound together, so that pouring is integrally completed.

When the pile-ring beam combined foundation is adopted as the bottom foundation, precast piles are firstly utilized to pile on site, then the section steel is connected with the top surface of the pile foundation corresponding to the lower part, the construction and the installation of the upper double truss structure 2 are met, after the upper double truss structure 2 is assembled, the ring beam bearing platform is bound with a reinforcement cage, and the binding is carried out together with the reinforcement extending out from the bottom of the connection bearing platform, and the whole pile foundation is poured. The ring beam bearing platform comprises an inner cross ring beam and an outer ring beam, the bottom of the ring beam is a pile foundation, the foundation form can be used for transformation of an old fan foundation, the lower portion of the outer ring beam is a pile foundation, the lower portion of the inner cross ring beam and the original fan foundation are connected and anchored by an anchor rod foundation, and the original fan foundation can be reasonably utilized.

In order to facilitate understanding of the utility model, the construction method of the prefabricated concrete double-truss fan lifting base comprises the following steps:

step 1: prefabricating in a factory, prefabricating by using a steel template according to a design drawing, and curing by steam fumigation (ensuring that the strength of concrete reaches more than C70);

step 2: the transportation vehicle is provided with a steel transportation bracket, and the prefabricated component is hoisted and fixedly connected with the transportation bracket;

step 3: preparing on site, finishing foundation pit excavation and cushion layer construction according to the design, and installing a working reference frame and foundation bolts of a steel supporting structure at a designated position;

step 4: installing an internal working reference frame to finish the calibration of verticality and horizontal base points;

step 5: and connecting the steel supporting structure with the square column on the transport vehicle, hoisting, carrying out aerial overturning, hoisting the inner column and the outer inclined column in sequence and in alignment, and gradually completing the connection of the beam section steel of No. 2, no. 3 and No. 4. The upright post is fixed with the working standard frame firstly, and the inner frame can be fixed by self after finishing: the outer inclined column is fixed with the inner upright column firstly, and the outer frame can be fixed by itself after finishing;

step 6: if the square column is segmented, repeating the steps 4 and 5 to finish the connection of the square column and the installation of the multi-layer truss;

step 7: after the double truss structure 2 is installed, steel bar binding construction is carried out on the bottom foundation and beam connecting nodes at the same time, and the air beam connecting node parts need to be hung with pouring templates;

step 8: loosening the connection with the working reference frame, and lifting the reference frame from the top;

step 9: supporting the top bearing platform 3, installing double-row bolt cages, binding reinforcement cages, and leveling levelness;

step 10: the on-site concrete pouring construction is carried out, wherein the pouring sequence is that pouring is carried out successively from the bottom to the top, and full vibration is needed in the pouring process;

step 11: after the concrete pouring is finished, adopting a maintenance measure of film covering and timing water spraying (the truss connection part and the top conversion bearing platform are sprayed by a high-pressure water pump);

step 12: and after the cast-in-place concrete reaches the curing period requirement, the upper structure above the top bearing platform 3 is installed.

In this document, terms such as front, rear, upper, lower, etc. are defined with respect to the positions of the components in the drawings and with respect to each other, for clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the protection sought herein. The embodiments described above and features of the embodiments herein may be combined with each other without conflict.

The implementation principle of the utility model is as follows: the utility model discloses a prefabricated concrete double-truss fan lifting base which is one of truss structures, wherein reinforced concrete square columns are used as main body stressed structures, the reinforced concrete square columns are effectively connected through reinforced concrete beams to form a concrete double-truss conical structure with a stable structure, the upper part of the concrete double-truss conical structure is connected with a fan steel tower or a concrete tower through a top bearing platform 3, and the lower part of the concrete double-truss conical structure is connected with a bottom foundation. The base is raised to two truss fans of pre-installation formula concrete can replace a part of steel tower section of thick bamboo or concrete tower section of thick bamboo at the bottom because of self rigidity is great to improve overall structure's rigidity, toper structure can be with upper portion load along main part atress structure dispersion, avoided traditional basis to the disadvantage of diffusion all around by the central point, can effectively practice thrift the cost, satisfy the continuous upgrading demand of wind-powered electricity generation trade.

The embodiments of the present utility model are all preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model in this way, therefore: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (10)

1. The prefabricated concrete double-truss fan lifting base is characterized by comprising a lower foundation (1), a double-truss structure (2) and a top bearing platform (3) which are sequentially connected from bottom to top, wherein the double-truss structure (2) is a conical stable structure formed by connecting reinforced concrete square columns and reinforced concrete square beams and is divided into an inner truss structure and an outer truss structure.

2. The prefabricated concrete double truss fan elevation base of claim 1, wherein the reinforced concrete square columns are divided into inclined columns and upright columns due to different position distribution and section sizes, and the reinforced concrete square beams are divided into a beam number 1, a beam number 2, a beam number 3, a beam number 4 and a beam number 5.

3. The pre-installed concrete double truss fan lifting base of claim 2, wherein the inclined columns are externally inclined reinforced concrete square columns, and the bottom distribution diameters of the inclined columns are larger than the top distribution diameters and are uniformly distributed radially.

4. The preassembled concrete double-truss fan lifting base according to claim 2, wherein the upright posts are internally vertical reinforced concrete square posts, the vertical distribution diameters are the same, the diameters are the same as the top distribution diameters of the inclined posts, namely, the inclined posts and the tops of the upright posts are distributed on the circular arcs with the same diameter, the inclined posts are uniformly distributed, and the upright posts are distributed in the middle of the inclined posts at intervals.

5. The prefabricated concrete double-truss fan lifting base according to claim 2, wherein the inclined column and the upright column are internally provided with tensioning prestressed steel strands, and the reinforced concrete square column is filled with concrete after the post-tensioning prestressed steel strands by pre-burying steel pipes with proper diameters and wall thicknesses to reserve channels for the prestressed steel strands during prefabrication.

6. The prefabricated concrete double truss fan lifting base of claim 2, wherein the upright posts are connected with the No. 1 beam and the No. 2 beam to form the internal truss structure, wherein the upright posts are of a main stress structure, the No. 1 beam is a cross beam connected with adjacent upright posts, and the No. 2 beam is a cross beam connected with adjacent upright posts;

the inclined columns are connected with the No. 4 beams to form the external truss structure, wherein the inclined columns are main stress structures, the No. 4 beams are cross beams connected with adjacent inclined columns, and no cross beam is designed between the adjacent inclined columns;

the cross beam between the inner truss and the outer truss is a No. 3 beam, a cross beam is not designed, the inner end of the No. 3 beam is connected with the upright post of the inner truss, and the outer end of the No. 3 beam is connected with the inclined post of the outer truss;

the No. 5 beam is positioned between the bottom of the double truss structure (2) and the connecting bearing platform connected with the lower foundation (1) and is a cross beam.

7. The prefabricated concrete double-truss fan lifting base according to claim 6, wherein the No. 1 beam is a cross beam connected with the upright, the prefabricated end of the cross beam is integrally prefabricated with the upright, the secondarily poured cross section is made into a special-shaped cross section, and a reinforcing steel bar with a certain length extends outwards;

the beam No. 2, the beam No. 3 and the beam No. 4 are cross beams between the inclined column and the upright column, the prefabricated ends of the cross beams are prefabricated with the inclined column or the upright column, the section of the secondary pouring is embedded with the section steel, and the section steel extends outwards for a certain length;

the No. 5 beam is positioned at the connecting bearing platform part of the lower foundation (1), the prefabricated end of the No. 5 beam and the connecting bearing platform are integrally prefabricated, the section of the secondary pouring is made into a special-shaped section, and the special-shaped section extends outwards to form a reinforcing steel bar with a certain length.

8. The pre-assembled concrete double truss fan elevation foundation according to claim 1, wherein the bottom of the double truss structure (2) is connected to the connection cap of the foundation and the top of the double truss structure (2) is connected to the top cap (3).

9. The prefabricated concrete double-truss fan lifting base according to claim 2, wherein when the upright column needs to be prefabricated in a segmented mode, the upright column is divided into an upper prefabricated column and a lower prefabricated column, the connecting end of the upright column is divided into a lower plug end and an upper plug end, square steel plates are arranged at the lower plug end and the upper plug end, one end of a construction rib of the upper plug end penetrates through the square steel plates, and an upper steel cap is arranged outside the upper plug end;

the construction rib of lower grafting end and steel sleeve screw-thread fastening, steel sleeve one end reserve certain length, with the upper grafting end stretches out the length of construction rib corresponding, steel sleeve with square steel sheet junction surface flushes, and the outside of lower upper grafting end is equipped with down the steel cap.

10. The prefabricated concrete double truss fan lifting base according to claim 1, wherein the double truss structure (2) comprises a first layer of cross beams, a second layer of cross beams, a third layer of cross beams and a fourth layer of cross beams which are sequentially reduced in area from bottom to top, and the first layer of cross beams, the second layer of cross beams, the third layer of cross beams and the fourth layer of cross beams are all horizontally arranged.