CN115559340A - Steel-concrete combined assembly type main transformer foundation and construction method thereof - Google Patents

Abstract

The invention relates to a steel-concrete combined assembly type main transformer foundation and a construction method thereof, comprising a concrete cushion, a combined raft and a combined buttress, and a plurality of combined rafts are distributed on the concrete cushion in a matrix; the number of combined buttresses It is half of the number of combined rafts. Each combined support pier corresponds to two adjacent combined rafts. The combined support pier is located above the combined raft. All are connected by bolts to form a whole. The combined raft is prefabricated in a split factory, which is small in size, reduces transportation costs, and improves transportation efficiency; at the same time, modular installation is flexible to meet the needs of different main transformer equipment, flexible construction and installation, and solves the on-site wet work caused by pouring The problem of heavy workload alleviates the problem of environmental pollution caused by construction to a certain extent, reduces construction procedures, improves the efficiency and construction quality of on-site operations, and greatly reduces labor costs.

Description

A steel-concrete composite assembled main transformer foundation and its construction method

Technical field:

The invention relates to a steel-concrete combined assembly type main transformer foundation and a construction method thereof.

Background technique:

Prefabricated technology has the advantages of short construction period, reduced environmental pollution, and labor cost savings. With the accelerated construction of new power systems, modular assembly technology has been applied in many aspects in the power industry. At present, the application fields are mainly concentrated in small prefabricated component foundations, cable trenches, etc., and the foundations of large equipment such as main transformers are still used. Traditional form of concrete pouring.

The traditional construction method of the main transformer foundation has many disadvantages. For example, there are a lot of wet operations, which cause a certain degree of environmental damage and waste of resources, and the difficulty of project quality control is relatively high. At the same time, the curing time of concrete is long, especially in cold weather. In humid and rainy areas, the winter break and the rainy season have a long shutdown time, which will further prolong the construction period of the substation and increase labor costs. The size of the foundation pier cannot be adjusted after the traditional concrete pouring construction of the foundation is completed. However, as the power load continues to increase, there are more and more cases of replacing the main transformer to increase the capacity, which leads to the early design plan and the later adjustment plan ( The actual arrival of the main transformer equipment) does not match, and the original foundation often needs to be demolished and rebuilt, which increases the project investment and waste of resources.

At present, the prefabricated main transformer foundation has also had certain research results, and the existing related technical solutions have the following characteristics: For example, Chinese patent CN201920125732.1 proposes a semi-standard distribution adjustable general-purpose main transformer foundation, which uses the whole board + The solution of the prefabricated beam or pier has the problem of high transportation cost due to the large volume and weight of the whole board. Another Chinese patent, CN202021215093.7, proposes a high-voltage mortise and tenon structure main transformer foundation that improves integrity and is easy to assemble. The prefabricated connection has been completed, but there are problems such as discontinuous stress on the reinforcement of the raft and large transportation space.

Invention content:

The present invention makes improvements to the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide a steel-concrete assembled main transformer foundation and its construction method, which has a reasonable design and improves the convenience of transportation and construction.

In order to achieve the above object, the technical solution adopted by the present invention is: a steel-concrete composite assembly type main transformer foundation, including a concrete cushion, and also includes a factory prefabricated composite raft and a composite pier, the composite raft is a plurality of , a plurality of combined rafts are distributed on the concrete cushion in a matrix; the number of the combined buttresses is half of the number of combined rafts, and each combined buttress corresponds to two adjacent combined rafts, the The composite buttress is located above the composite raft, and the plurality of composite rafts and the composite raft and the composite pier are all connected by bolts to form a whole.

Further, the composite raft includes a rectangular concrete raft, a pair of vertical raft steel connectors are arranged on the peripheral side of the concrete raft, and one of the pair of raft steel connectors and the concrete raft The right-angle sides are parallel; the raft steel connectors of adjacent composite rafts are connected by first high-strength bolts.

Further, the combined pier includes a rectangular concrete pier, a pair of steel connectors for the upper pier are provided at the bottom of the concrete pier; a steel connector for the lower pier is provided at the top of the concrete raft, The corresponding upper buttress steel connectors and lower buttress steel connectors are connected by second high-strength bolts.

Further, the side of the raft steel connector facing the concrete raft is provided with a plurality of raft connection pegs, the raft steel connector and the concrete raft are connected in shear through a plurality of raft connection pegs, and the raft The end of the steel connector away from the concrete raft is provided with a plurality of raft bolt holes distributed side by side along its length direction and used to cooperate with the first high-strength bolts.

Further, the end of the raft steel connector close to the concrete raft is provided with several reinforcement connection holes distributed side by side along its length direction, and the end of the reinforcement connection holes away from the concrete raft is fixed with a pre-embedded reinforcement backing plate; The concrete raft is pre-embedded with several raft pre-embedded steel bars corresponding to the positions of several steel bar connection holes, and the raft pre-embedded steel bars pass through the steel bar connection holes and the pre-embedded steel backing plate in sequence, and pass through the The raft is fixed with pre-embedded steel bars and nuts.

Further, the steel connector of the upper pier is arranged horizontally, the top of the steel connector of the upper pier is provided with a plurality of connecting studs for the upper pier, and the steel connector of the upper pier is connected to the concrete buttress through a plurality of upper buttresses Stud shear connection, the bottom of the upper pier steel connector is provided with a number of upper buttress bolt holes distributed side by side along its length; the lower buttress steel connector is arranged horizontally, and the bottom of the lower buttress steel connector There are multiple connecting studs for the lower pier. The steel connecting piece of the lower pier is connected to the concrete raft through a plurality of connecting studs for the lower pier. The top of the steel connecting piece for the lower pier is provided with several Bolt holes of the lower pier are distributed side by side, the bolt holes of the lower pier correspond to the bolt holes of the upper pier, and facilitate the penetration of the second high-strength bolt.

Further, the top of the concrete pier is provided with a pair of horizontally arranged pre-embedded steel plates for the pier, and the pre-embedded steel plates for the pier are anchored on the concrete pier through steel bars, and the middle part of the pre-embedded steel plate for the pier is provided with a round hole for pouring .

Further, the inside of the concrete pier is equipped with longitudinal stress reinforcement and transverse distribution reinforcement.

Another technical solution adopted by the present invention is: a construction method for the steel-concrete assembled main transformer foundation, including the following steps:

Step S1: Complete the pre-construction work of the steel-concrete composite assembled main transformer foundation of the substation, including site leveling, surveying and setting out, and earthwork excavation;

Step S2: Determine the number of composite rafts and composite piers according to design requirements;

Step S3: complete the processing of each composite raft and composite pier in the factory;

Step S4: Installing the formwork of the concrete cushion, completing the concrete pouring and maintenance of the concrete cushion;

Step S5: After the prefabricated composite raft and composite pier are transported to the construction site, locate the positions of multiple composite rafts according to the design requirements, and then use the first high-strength bolts to connect each composite raft to each other, so that Each combined raft forms a whole;

Step S6: Connect the composite pier and the composite raft that has been connected to each other in step S5 with the second high-strength bolts to complete the construction.

Compared with the prior art, the present invention has the following effects: the structural design of the present invention is reasonable, the combined raft is prefabricated in a split factory, and the volume of each combined raft is small, which reduces the transportation cost and improves the transportation efficiency; At the same time, modular installation is realized, which is flexibly applicable to the needs of different main transformer equipment, flexible construction and installation, and solves the problem of heavy on-site wet work workload caused by the integral pouring of foundation rafts and buttresses at the existing main transformer foundation construction site. To a certain extent, the environmental pollution problems caused by construction are alleviated, the construction process is reduced, the efficiency and construction quality of on-site operations are improved, and labor costs are greatly reduced.

Description of drawings:

Fig. 1 is the three-dimensional structure schematic diagram of the embodiment of the present invention;

Fig. 2 is a top view structural schematic view of an embodiment of the present invention;

Fig. 3 is a front view structural schematic diagram of an embodiment of the present invention;

Fig. 4 is a side view structural schematic diagram of an embodiment of the present invention;

Fig. 5 is a schematic diagram of the three-dimensional structure of the combined raft in the embodiment of the present invention;

Fig. 6 is a schematic diagram of the three-dimensional structure of the combined pier in the embodiment of the present invention;

Fig. 7 is a schematic diagram of the three-dimensional structure of the raft steel connector in the embodiment of the present invention;

Fig. 8 is a schematic diagram of the three-dimensional structure of the steel connector of the lower pier in the embodiment of the present invention;

Fig. 9 is a schematic perspective view of the three-dimensional structure of the upper buttress steel connector in the embodiment of the present invention.

In the picture:

1-concrete cushion; 2-combined raft; 201-concrete raft; 202-steel connector for the lower pier; 2021-main body of the steel connector for the lower pier; 2022-bolt holes for the lower pier; Connecting studs; 203-raft steel connectors; 2031-main body of raft steel connectors; 2032-raft connecting studs; 2033-reinforcement connection holes; 2034-raft bolt holes; 204-embedded steel backing plate; 205- raft pre-embedded reinforcement nut; 206- raft pre-embedded reinforcement; 3-combined pier; 301- concrete pier; 302- upper pier steel connector; 3021- upper pier steel connector body; 3022- Bolt holes of the upper pier; 3023-connection studs of the upper pier; 303-embedded steel plate of the pier; 304-round holes for pouring; 4-first high-strength bolts; 5-second high-strength bolts.

detailed description:

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or It should not be construed as limiting the invention by implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation.

As shown in Figures 1 to 9, the steel-concrete combined assembly type main transformer foundation of the present invention aims to reduce the wet work on site as much as possible, shorten the construction period of the project, reduce the environmental pollution and noise impact on the construction site, and improve the quality of the project. It also solves the problems of large volume of prefabricated main transformer foundation components, difficult transportation, and complicated on-site installation. The specific structure includes concrete cushion 1, factory prefabricated composite raft 2 and composite pier 3, and the composite raft 2 is plural A plurality of combined rafts 2 are distributed in matrix on the concrete cushion 1; the number of the combined buttresses 3 is half of the number of combined rafts, and each combined buttress 3 is respectively combined with two adjacent longitudinal The raft 2 is corresponding, that is: a combined pier 3 is connected to two combined rafts 2, and each combined pier is only connected to one combined pier; the combined pier 3 is located above the combined raft 2, A plurality of composite rafts 2 are connected to each other, and the composite rafts 2 and the composite pier 3 are connected by high-strength bolts to form a whole.

In this embodiment, described in conjunction with Fig. 5 and Fig. 7-8, the composite raft 2 includes a rectangular concrete raft 201, and a pair of vertical raft steel connections are arranged on the peripheral side of the concrete raft 201. 203, a pair of raft steel connectors 203 are parallel to a pair of right-angled sides of the concrete raft 201; the raft steel connectors 203 of adjacent composite rafts 2 are connected by first high-strength bolts 4 . During construction, a pair of raft steel connectors are located on the inner side of the concrete raft, and the pair of raft steel connectors of each combined raft is respectively connected with the other two adjacent combined rafts.

In this embodiment, as shown in FIG. 7 , the raft steel connector 203 includes a raft steel connector body 2031 with an I-shaped cross section, and the raft steel connector body 2031 faces one side of the concrete raft 201 A plurality of raft connecting pegs 2032 are provided, the main body 2031 of the raft steel connector and the concrete raft 201 are shear-resistant connected by a plurality of raft connecting pegs 2032, and the main body 2031 of the raft steel connecting part is away from the end of the concrete raft 201 There are a plurality of raft bolt holes 2034 distributed side by side along its length and used to cooperate with the first high-strength bolts 4 . During construction, multiple composite rafts are distributed in a matrix, adjacent composite rafts are connected by raft steel connectors, and the raft steel connectors of two adjacent composite rafts are connected by the first high-strength bolts. Realize the connection and fixation of two adjacent combined rafts.

In this embodiment, as shown in Figure 5, the end of the raft steel connector main body 2031 close to the concrete raft 201 is provided with several reinforcement connection holes 2033 distributed side by side along its length direction, and the reinforcement connection holes 2033 are far away from One end of the concrete raft 201 is fixed with a pre-embedded steel backing plate 204; the concrete raft 201 is pre-embedded with several raft pre-embedded steel bars 206 corresponding to the positions of several steel connection holes 2033, and the raft The pre-embedded steel bar 206 passes through the steel bar connecting hole 2033 and the pre-embedded steel bar backing plate 204 in turn, and is fixed by the pre-embedded steel bar nut 205 of the raft.

In this embodiment, as shown in Figure 6, the combined pier 3 includes a rectangular concrete pier 301, a pair of upper pier steel connectors 302 are provided at the bottom of the concrete pier 301; The top of 301 is provided with a lower buttress steel connector 202, that is, the two upper buttress steel connectors of a combined buttress respectively correspond to the lower buttress steel connectors on the top of two combined rafts, and the positions correspond to each other. The upper buttress steel connector 302 and the lower buttress steel connector 202 are connected by second high-strength bolts 5, so as to realize the connection of the combined buttress and the combined raft to form a whole.

In this embodiment, the upper buttress steel connector 302 is arranged horizontally, the upper buttress steel connector 302 includes an upper buttress steel connector main body 3021, and the top of the upper buttress steel connector main body 3021 is provided with a plurality of upper supports The pier connection pegs 3023, the main body 3021 of the upper pier steel connector and the concrete pier 301 are shear-resistant connected by a plurality of upper pier connection pegs 3023, and the bottom of the upper pier steel connector 302 is provided with several Bolt holes 3022 of the upper pier are distributed side by side, as shown in FIG. 9 . The lower buttress steel connector 202 is arranged horizontally, the lower buttress steel connector 202 includes a lower buttress steel connector main body 2021, the bottom of the lower buttress steel connector main body 2021 is provided with a plurality of lower buttress connecting pegs 2023 , the main body 2021 of the steel connector for the lower pier is connected to the concrete raft 201 through a plurality of connecting studs 2023 for the lower pier in shear resistance, and the top of the main body 2021 of the steel connector for the lower pier is provided with several lower buttresses distributed side by side along its length direction. The buttress bolt holes 2022, the lower buttress bolt holes 2022 correspond to the positions of the upper buttress bolt holes 3022, and facilitate penetration of the second high-strength 5 bolts, as shown in FIG. 8 . During construction, the two upper pier steel connectors of a composite pier correspond to the lower pier steel connectors on the top of the two composite rafts respectively, and the upper buttress steel connectors and the lower buttress steel connectors are butted up and down , the bolt holes of the lower pier correspond to the bolt holes of the upper pier and are used to cooperate with the second high-strength bolts to realize the connection and fixation of the composite pier and the composite raft.

In this embodiment, the top of the concrete pier 301 is provided with a pair of horizontally arranged pier pre-embedded steel plates 303. The middle part is provided with pouring circular hole 304.

In this embodiment, the interior of the concrete pier 301 is configured with longitudinal stress reinforcement and transverse distribution reinforcement.

In this embodiment, the main body of the raft steel connector, the main body of the steel connector for the upper pier, and the main body of the steel connector for the lower pier all include a pair of parallel side plates, and a pair of connecting plates pass between the pair of side plates. The connecting plates are vertically distributed with the side plates, the cross-sectional shape formed by the combination of a pair of side plates and a pair of connecting plates is I-shaped, a pair of side plates are used as wing plates, and a pair of connecting plates is surrounded by The cavity serves as the web.

Embodiment: Taking 4 combined rafts and 2 combined buttresses as an example, the 4 combined rafts are distributed in a matrix on the concrete cushion 1, and the 2 combined buttresses are located directly above the four combined rafts. The first composite pier is located above the two adjacent composite rafts in the longitudinal direction, and the four composite rafts are connected to each other by the raft steel connectors, and then the rafts of the adjacent composite rafts are connected by the first high-strength bolts. The steel connectors are connected and fixed; the composite buttresses and the two composite rafts corresponding to their positions are connected by the upper and lower buttress steel connectors, and then the upper and lower buttresses are connected by the second high-strength bolts. The connection is fixed. It should be noted that, in order to ensure that each combined pier corresponds to the adjacent combined rafts in the longitudinal direction, when the combined rafts are distributed in a matrix, the number of rows is plural. For example, when there are 6 combined rafts, the combination There are three supporting piers, and the 6 combined rafts are distributed in 2 rows and 3 columns; if there are 8 combined rafts, it is 4 rows and 2 columns; if there are 10 combined rafts, it is 2 rows and 5 columns, and so on.

In this embodiment, during construction, the following steps are included:

Step S1: Complete the pre-construction work of the steel-concrete composite assembled main transformer foundation of the substation, including site leveling, measurement setting-out and earthwork excavation, etc.;

Step S2: Determine the number of combined rafts 2 and combined buttresses 3 according to the design requirements;

Step S3: According to the requirements, complete the processing of each combined raft 2 and combined buttress 3 in the factory;

Step S4: Installing the formwork of the concrete cushion, completing the concrete pouring and curing of the concrete cushion 1;

Step S5: After the prefabricated composite raft 2 and composite pier 3 are transported to the construction site, locate the positions of multiple composite rafts 2 according to the design requirements, and then use the first high-strength bolts 4 to connect each composite raft 2 interconnected so that each combined raft forms a whole;

Step S6: Connect the composite pier 3 and the composite raft 2 that has been connected to each other in step S5 to form a whole with the second high-strength bolts 5 to complete the construction.

It should be noted that, during the construction process, the above steps S1, S2 and S3 can be carried out simultaneously.

The advantages of the present invention are: (1) simple structure, flexible construction and installation, realizing modular installation, flexibly applicable to the needs of different main transformer equipment, and solving the problems caused by the integral pouring of foundation rafts and buttresses at the existing main transformer foundation construction site; The problem of heavy on-site wet work workload has alleviated the environmental pollution problems caused by construction to a certain extent, reduced construction procedures, improved the efficiency and construction quality of on-site operations, and greatly reduced labor costs. (2) The combined raft is divided into several, and each combined raft has a small volume, which reduces the transportation cost and improves the transportation efficiency; (3) solves the general problem of the service life of the traditional cast-in-place concrete foundation, and the present invention All are factory prefabricated parts, using high-strength materials with high density, which prolongs the service life.

If the present invention discloses or relates to parts or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, using bolts or screws), or it can also be understood as: Non-detachable fixed connection (such as riveting, welding), of course, the mutual fixed connection can also be replaced by an integrated structure (such as manufactured by integral forming by casting process) (except that the integral forming process cannot be used obviously).

In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in the present invention to indicate positional relationships or shapes include states or shapes that are similar, similar or close to them.

Any component provided by the present invention can be assembled from multiple individual components, or can be a single component manufactured by integral forming process.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: the present invention can still be The specific implementation mode of the invention is modified or some technical features are equivalently replaced; without departing from the spirit of the technical solution of the present invention, all of them shall be included in the scope of the technical solution claimed in the present invention.

Claims (9)

1. A steel-concrete combined assembled main transformer foundation, including a concrete cushion, is characterized in that: it also includes a factory-prefabricated combined raft and a combined buttress, and the combined rafts are plural, and the plural combined rafts are in the form of The matrix is distributed on the concrete cushion; the number of the combined buttresses is half of the number of the combined rafts, and each combined buttress corresponds to two adjacent combined rafts, and the combined buttresses are located on the combined raft On the upper part of the structure, a plurality of composite rafts are connected with each other, and the composite raft and the composite pier are connected by bolts to form a whole. 2. A steel-concrete combined assembled main transformer foundation according to claim 1, characterized in that: the combined raft comprises a rectangular concrete raft, and a pair of vertical A pair of raft steel connectors are parallel to a pair of right-angled sides of the concrete raft; the raft steel connectors of adjacent combined rafts are connected by first high-strength bolts. 3. A steel-concrete combined assembly type main transformer foundation according to claim 2, characterized in that: the combined support piers include rectangular concrete support piers, and a pair of upper support piers are arranged at the bottom of the concrete support piers A steel connector; the top of the concrete raft is provided with a lower pier steel connector, and the corresponding upper buttress steel connector and the lower buttress steel connector are connected by second high-strength bolts. 4. A steel-concrete combined assembly type main transformer foundation according to claim 2, characterized in that: the side of the raft steel connector facing the concrete raft is provided with a plurality of raft connection bolts, and the raft The steel connector and the concrete raft are shear-resistant connected by a plurality of raft connection bolts, and the end of the raft steel connector away from the concrete raft is provided with multiple parallel distributions along its length and used to cooperate with the first high-strength bolts raft bolt holes. 5. A steel-concrete combined assembly type main transformer foundation according to claim 4, characterized in that: one end of the raft steel connector close to the concrete raft is provided with several steel bar connections arranged side by side along its length direction holes, the end of the steel bar connection hole away from the concrete raft is fixed with a pre-embedded steel backing plate; the concrete raft is pre-embedded with a number of raft pre-embedded steel bars corresponding to the positions of several steel bar connection holes, the The pre-embedded steel bars of the raft pass through the steel bar connection holes and the pre-embedded steel backing plate in turn, and are fixed by the raft pre-embedded steel bar nuts. 6. A steel-concrete combined assembly type main transformer foundation according to claim 3, characterized in that: the steel connector of the upper pier is arranged horizontally, and a plurality of upper piers are arranged on the top of the steel connector of the upper pier Connecting studs, the steel connector of the upper pier and the concrete buttress are connected in shear through multiple connecting studs of the upper pier, and the bottom of the steel connector of the upper pier is provided with several upper pier bolts distributed side by side along its length direction Holes; the lower pier steel connectors are set horizontally, the bottom of the lower buttress steel connectors are provided with a plurality of lower buttress connecting bolts, and the lower buttress steel connectors and the concrete raft pass through a plurality of lower buttress connecting bolts Nail shear connection, the top of the lower pier steel connector is provided with several lower pier bolt holes distributed side by side along its length direction, the positions of the lower buttress bolt holes correspond to the positions of the upper buttress bolt holes, and are represented by It is beneficial for the penetration of the second high-strength bolt. 7. A steel-concrete combined assembly type main transformer foundation according to claim 3, characterized in that: a pair of horizontally arranged pier pre-embedded steel plates are arranged on the top of the concrete pier, and the pier pre-embedded steel plates It is anchored on the concrete pier through steel bars, and the middle part of the pre-embedded steel plate of the pier is provided with a round hole for pouring. 8 . The steel-concrete assembled main transformer foundation according to claim 3 , characterized in that: the interior of the concrete pier is provided with longitudinal stress reinforcement and transverse distribution reinforcement. 9. A construction method for the foundation of a steel-concrete assembled main transformer, characterized in that: comprising the use of the steel-concrete assembled main transformer foundation as described in any one of claims 1 to 8, comprising the following steps: Step S1: Complete the pre-construction work of the steel-concrete composite assembled main transformer foundation of the substation, including site leveling, surveying and setting out, and earthwork excavation; Step S2: Determine the number of composite rafts and composite piers according to design requirements; Step S3: complete the processing of each composite raft and composite pier in the factory; Step S4: Installing the formwork of the concrete cushion, completing the concrete pouring and maintenance of the concrete cushion; Step S5: After the prefabricated composite raft and composite pier are transported to the construction site, locate the positions of multiple composite rafts according to the design requirements, and then use the first high-strength bolts to connect each composite raft to each other, so that Each combined raft forms a whole; Step S6: Connect the composite pier and the composite raft that has been connected to each other in step S5 with the second high-strength bolts to complete the construction.

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