CN220814238U - Assembled steel box girder structure frame - Google Patents

Abstract

The utility model relates to an assembled steel box girder structural frame, including a frame layer, each of which includes a column and a steel box girder, the steel box girder includes an upper flange plate, a lower flange plate, and a first web plate and a second web plate arranged between the upper flange plate and the lower flange plate, the first web plate and the second web plate are provided with weight reduction holes, the lower flange plate has a support edge protruding from the corresponding web plate on one side adjacent to the center of the corresponding square frame, and a plurality of prefabricated floor plates arranged sequentially along the left and right directions are arranged in each square frame, the front and rear ends of the prefabricated floor plates are supported on the corresponding support edges of the lower flanges of two steel box girders arranged at intervals in front and behind, and the upper end of the prefabricated floor plates is arranged flush with the upper end of the upper flange plate of the steel box girder. In the utility model, the prefabricated floor plates are supported on the support edges of the lower flange plates of the steel box girder, and the prefabricated floor plates and the steel box girder of the same frame layer are at the same height, which solves the problem of the high height of the structural frame caused by the different heights of the steel beams and the prefabricated floor plates in the prior art.

Description

An assembled steel box beam structural frame

Technical Field

The utility model relates to the field of assembled buildings, in particular to an assembled steel box beam structure frame.

Background technique

Steel structures have the characteristics of high strength, good toughness, strong deformation ability and high reliability. They can effectively guarantee the performance of building structures and are currently widely used in industrial and civil buildings.

In traditional steel structure housing construction, a structural frame structure composed of steel beams and steel columns is mostly used. However, in traditional technology, prefabricated floor slabs can only be arranged on the upper side of the upper flange of the steel beam, and the steel beam is located on the lower side of the prefabricated floor slab, resulting in the steel beam being exposed. Although this structural frame has the advantages of short construction period, convenient on-site operation, and better overall building performance than traditional cast-in-place structures, it also has the following problems: Since the steel beams and prefabricated floor slabs are at different floor heights, the floor structure height is large, the lower surface of the floor slab is uneven and needs to be suspended, the entire interface of the steel beam needs to be fireproofed, and the fireproofing and anti-corrosion costs are high.

In the structural design of high-rise buildings, it is often necessary to reduce the cross-sectional height of the beam as much as possible due to requirements such as floor height restrictions or increased net height. Therefore, this traditional steel structure frame cannot meet the requirements due to its large structural height.

Utility Model Content

The utility model aims to provide an assembled steel box beam structural frame to solve the problem in the prior art that the steel beams and the prefabricated floor slabs are at different heights, resulting in a high floor height of the structural frame.

In order to solve the above technical problems, the technical solution of an assembled steel box girder structure frame in the utility model is as follows:

An assembled steel box girder structural frame comprises a plurality of frame layers sequentially arranged in an up-down direction, each frame layer comprises a plurality of prefabricated floor slabs and a plurality of vertically arranged columns, any four adjacent columns in the circumferential direction are located at the four vertex corners of a square frame, the assembled steel box girder structural frame further comprises a steel box girder fixed between two adjacent columns in the circumferential direction of the square frame, the steel box girder comprises an upper flange plate, a lower flange plate and a first web plate and a second web plate arranged between the upper flange plate and the lower flange plate, the first web plate and/or the second web plate are inclined plates gradually extending from top to bottom toward the center of the corresponding square frame, weight reduction holes are provided on the first web plate and the second web plate, a side of the lower flange plate adjacent to the center of the corresponding square frame has a support edge protruding from the corresponding web plate, and each square A plurality of precast floor slabs are arranged in sequence along the left-right direction in the frame, and the front and rear ends of the precast floor slabs are supported on the corresponding supporting edges of the lower flanges of two steel box girders arranged at intervals in front and behind. The left end of the precast floor slab on the far left in the square frame is supported on the corresponding supporting edge of the lower flange of the steel box girder on its left side, and the right end of the precast floor slab on the far right in the square frame is supported on the corresponding supporting edge of the lower flange of the steel box girder on its right side. The upper end of the precast floor slab is flush with the upper end of the upper flange plate of the steel box girder. The precast floor slab has a floor slab cavity extending along the front and rear direction. The first post-cast concrete body is cast in the front and rear ends of the floor slab cavity of the precast floor slab, in the gap between the front and rear ends of the precast floor slab and the adjacent steel box girder, and in the weight-reducing holes of the steel box girder on both sides of the front and rear of the precast floor slab.

Furthermore, a second post-cast concrete body is cast between the left end of the leftmost precast floor slab in the square frame and the right end of the steel box girder on the left side of the precast floor slab, and in the corresponding weight-reducing holes of the steel box girder on the left side of the precast floor slab; a third post-cast concrete body is cast between the right end of the rightmost precast floor slab in the square frame and the left end of the steel box girder on the right side of the precast floor slab, and in the corresponding weight-reducing holes of the steel box girder on the right side of the precast floor slab.

Furthermore, the shape of the weight-reducing hole is circular, oval, square, rectangular or polygonal.

Furthermore, each steel box girder is divided into an edge steel box girder located at the edge positions around the prefabricated steel box girder structural frame and a standard steel box girder located at the internal position of the prefabricated steel box girder structural frame. The first web and the second web of the standard steel box girder form an eight-shaped structure that is narrow at the top and wide at the bottom. The second web of the edge steel box girder is located on the inner side of the prefabricated steel box girder structural frame. The first web of the edge steel box girder is perpendicular to the upper flange plate and the lower flange plate of the edge steel box girder, and the second web of the edge steel box girder is inclined to the upper flange plate and the lower flange plate of the edge steel box girder.

Furthermore, the columns are square columns with hollow structures, and two adjacent frame layers in the up and down directions are defined as an upper frame layer and a lower frame layer, respectively. The bottom of the column of the upper frame layer is positioned and inserted into the inner hole at the top of the column of the lower frame layer, and the inner hole at the top of the column of the lower frame layer is provided with a stop end surface for cooperating with the bottom stop of the column of the upper frame layer to limit the downward movement limit of the column of the upper frame layer, and the bottom of the column of the upper frame layer is connected to the top of the column of the lower frame layer by bolts.

Furthermore, the arrangement of columns of each frame layer constitutes a multi-row structure arranged at intervals along the front-to-back direction, and each row of columns includes four columns arranged at intervals along the left-to-right direction. From left to right, the columns are respectively the first column, the second column, the third column and the fourth column, the spacing between the second column and the third column is smaller than the spacing between the first column and the second column, the spacing between the first column and the second column is the same as the spacing between the third column and the fourth column, the steel box girder is connected between the upper ends of the second column and the third column, and an eight-shaped steel beam support is arranged between the steel box girder between the second column and the third column of the lower frame layer and the steel box girder between the second column and the third column of the upper frame layer.

Furthermore, a connecting assembly is arranged between the end of the steel box girder and the corresponding column, and the connecting assembly includes an upper flange connecting plate, a lower flange connecting plate and a web connecting plate fixed to the side of the corresponding column, the upper flange connecting plate is connected to the upper flange plate of the steel box girder by bolts, the lower flange connecting plate is connected to the lower flange plate by bolts, and the web connecting plate is connected to the corresponding web of the steel box girder by bolts.

Furthermore, the upper flange plate and the lower flange plate are welded and fixed to the upper and lower ends of the first web plate and the second web plate.

Furthermore, the first web and the second web include an upper web and a lower web which are arranged vertically, the upper web and the lower web are welded together, and the weight-reducing holes span the upper web and the lower web in the vertical direction.

Furthermore, the upper flange plate, the first web plate and the second web plate are bent steel plate parts, and the lower ends of the first web plate and the second web plate are welded to the lower flange plate.

The beneficial effects of the utility model are as follows: in the utility model, the entire assembled steel box girder structure frame includes a plurality of frame layers sequentially arranged in the up-down direction, each frame layer includes columns, steel box girders and prefabricated floor slabs, wherein any four adjacent columns in the circumferential direction are located at the four vertex corners of a square frame, each steel box girder adopts a hollow structure with an upper flange plate, a lower flange plate and a first web plate and a second web plate, and the first web plate and/or the second web plate are inclined plates that gradually extend from top to bottom toward the center of the corresponding square frame, thereby ensuring that the steel box girder has good torsion resistance and flexural resistance, and the lower flange plate has a protruding protrusion on one side adjacent to the center of the corresponding square frame On the supporting edge of the corresponding web plate, each precast floor slab in the square frame is supported on the corresponding supporting edge respectively, ensuring that the upper end of the precast floor slab is flush with the upper end of the upper flange plate of the steel box beam, so that the top height of the frame layer can be effectively reduced, thereby reducing the height of the frame layer and the height of the steel box beam structure frame; the setting of the weight-reducing holes can not only reduce the weight of the steel box beam and save the use of steel, but also when the first post-cast concrete is poured between the precast floor slab and the steel box beam, the first post-cast concrete will flow into the floor cavity and the weight-reducing holes of the precast floor slab, thereby improving the connection strength between the precast floor slab and the steel box beam.

BRIEF DESCRIPTION OF THE DRAWINGS

By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

FIG1 is a schematic structural diagram of Embodiment 1 of an assembled steel box girder structural frame in the present invention;

FIG2 is a perspective view of FIG1;

FIG3 is a schematic diagram of the structure of a single frame layer in FIG1;

FIG4 is a perspective view of FIG3;

FIG5 is a schematic diagram of the coordination between the precast floor slab and the steel box girder when viewed from above;

FIG6 is a perspective view of FIG5;

FIG7 is a schematic diagram of the coordination of the precast floor slab and the steel box girder in FIG1 ;

FIG8 is an enlarged view of point A in FIG7;

FIG9 is an enlarged view of point B in FIG7;

Figure 10 is a schematic diagram of the cooperation between the steel box girder and the column in the utility model;

Figure 11 is a schematic diagram of the structure of the prefabricated floor in the utility model;

FIG12 is a schematic diagram of the structure of the connection assembly in the present utility model;

FIG13 is an exploded view of FIG12;

Figure 14 is a schematic diagram of the structure of a standard steel box girder in the utility model;

FIG15 is a side view of FIG14;

FIG16 is a top view of FIG14;

FIG17 is a perspective view of FIG14;

Figure 18 is a schematic diagram of the structure of the edge steel box girder of the utility model;

FIG19 is a side view of FIG18;

FIG20 is a top view of FIG18;

FIG21 is a perspective view of FIG18;

22 is a schematic structural diagram of the second web of the standard steel box girder in Example 2 of the assembled steel box girder structural frame of the utility model;

FIG23 is a schematic diagram of cutting the second web in FIG22;

FIG24 is a schematic structural diagram of a standard steel box girder in Example 3 of an assembled steel box girder structural frame in the utility model;

Explanation of reference numerals: 1. Standard steel box girder; 1-1. Upper flange plate of standard steel box girder; 1-2. First web plate of standard steel box girder; 1-3. Lower flange plate of standard steel box girder; 1-4. Second web plate of standard steel box girder; 1-5. Weight reduction hole; 1-6. Support edge; 2. Edge steel box girder; 2-1. Upper flange plate of edge steel box girder; 2-2. First web plate of edge steel box girder; 2-3. Lower flange plate of edge steel box girder; 2-4. Second web plate of edge steel box girder; 3. Prefabricated Floor; 3-1, floor cavity; 4, column; 4-1, first column; 4-2, second column; 4-3, third column; 4-4, fourth column; 5, connection assembly; 5-1, upper flange connection plate; 5-2, first web connection plate; 5-3, second web connection plate; 5-4, lower flange connection plate; 6, embedded connection piece; 7, first post-cast concrete body; 8, steel beam support; 9, frame layer; 10, upper web; 11, lower web; 12, trapezoidal corrugation line.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in more different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

An embodiment 1 of an assembled steel box girder structural frame in the utility model is shown in Figures 1 to 21:

It comprises a plurality of frame layers 9 sequentially arranged in the up-down direction, each frame layer 9 comprises a plurality of prefabricated floor slabs 3 and a plurality of vertically arranged columns 4, the columns are square columns of hollow structure, and two adjacent frame layers in the up-down direction are defined as an upper frame layer and a lower frame layer, the bottoms of the columns of the upper frame layer are positioned and inserted into the inner holes at the tops of the columns of the lower frame layer, the inner holes at the tops of the columns of the lower frame layer are provided with stop end faces for cooperating with the bottom stops of the columns of the upper frame layer to limit the downward movement limit of the columns of the upper frame layer, and the bottoms of the columns of the upper frame layer are connected to the tops of the columns of the lower frame layer by bolts.

Any four adjacent columns 4 along the circumference are located at the four corners of a square frame, where the square frame is a virtual square frame, and the assembled steel box girder structure frame also includes a steel box girder fixed between two adjacent columns along the circumference of the square frame, and the four columns and the steel box girder between the corresponding two adjacent columns together constitute a solid square frame. The columns of each frame layer are arranged to form a multi-row structure arranged in a spaced manner along the front-back direction, and each row of columns includes four columns arranged in a spaced manner along the left-right direction. From left to right, each column is defined as a first column 4-1, a second column 4-2, a third column 4-3 and a fourth column 4-4, and the spacing between the second column and the third column is smaller than the spacing between the first column and the second column, and the spacing between the first column and the second column is the same as the spacing between the third column and the fourth column. The steel box girder is connected between the upper ends of the second column and the third column, and an eight-shaped steel beam support 8 is provided between the steel box girder between the second column and the third column of the lower frame layer and the steel box girder between the second column and the third column of the upper frame layer.

The steel box girder comprises an upper flange plate, a lower flange plate and a first web plate and a second web plate arranged between the upper flange plate and the lower flange plate. The first web plate and/or the second web plate are inclined plates extending gradually from top to bottom toward the center of the corresponding square frame. In this embodiment, each steel box girder is divided into an edge steel box girder 2 located at the edge positions of the assembled steel box girder structural frame and a standard steel box girder 1 located on the inner side of the edge steel box girder. The first web 1-2 of the standard steel box girder and the second web 1-4 of the standard steel box girder form an eight-shaped structure that is narrow at the top and wide at the bottom. In the figure, item 1-1 represents the upper flange plate of the standard steel box girder; item 1-3 represents the lower flange plate of the standard steel box girder; the second web 2-4 of the edge steel box girder is located on the inner side of the first web 2-2 of the edge steel box girder, the first web 2-2 of the edge steel box girder is perpendicular to the upper flange plate 2-1 of the edge steel box girder and the lower flange plate 2-3 of the edge steel box girder, and the second web of the edge steel box girder is inclined to the upper flange plate 2-1 of the edge steel box girder and the lower flange plate 2-3 of the edge steel box girder. That is to say, for the standard steel box girder, the first web of the standard steel box girder and the second web of the standard steel box girder are both inclined plates that are inclined and intersected with the vertical direction; for the corresponding edge steel box girder, the first web of the edge steel box girder close to the center of the square frame is an inclined plate that is inclined and intersected with the vertical direction, and the second web of the edge steel box girder far from the center of the square frame is a vertically arranged straight plate.

The first web and the second web are provided with weight-reducing holes 1-5 spaced apart along the length extension direction thereof. The weight-reducing holes in this embodiment are circular in shape. In other embodiments of the utility model, the weight-reducing holes may also be elliptical, square, rectangular or polygonal in shape.

The lower flange plate has a support edge 1-6 protruding from the corresponding web on one side adjacent to the center of the corresponding square frame, that is, for a standard steel box girder, both sides of the lower flange plate of the standard steel box girder have support edges 1-6, and for an edge steel box girder, one side of the lower flange plate of the edge steel box girder has a support edge.

A plurality of precast floor slabs 3 are arranged in sequence along the left-right direction in each square frame, and the front and rear ends of the precast floor slabs 3 are supported on the corresponding supporting edges of the lower flanges of two steel box girders arranged at intervals in front and behind. The left end of the precast floor slab on the far left in the square frame is supported on the corresponding supporting edge of the lower flange of the steel box girder on its left side, and the right end of the precast floor slab on the far right in the square frame is supported on the corresponding supporting edge of the lower flange of the steel box girder on its right side. The upper end of the precast floor slab is flush with the upper end of the upper flange plate of the steel box girder, and the precast floor slab has a floor slab cavity extending along the front and rear direction. The first post-cast concrete body 7 is cast in the front and rear ends of the floor slab cavity of the precast floor slab, in the gap between the front and rear ends of the precast floor slab and the adjacent steel box girder, and in the weight-reducing holes of the steel box girder on both sides of the precast floor slab.

A second post-cast concrete body is cast between the left end of the leftmost precast floor slab in the square frame and the right end of the steel box girder on the left side of the precast floor slab, and in the corresponding weight-reducing holes of the steel box girder on the left side of the precast floor slab; a third post-cast concrete body is cast between the right end of the rightmost precast floor slab in the square frame and the left end of the steel box girder on the right side of the precast floor slab, and in the corresponding weight-reducing holes of the steel box girder on the right side of the precast floor slab.

A connection assembly 5 is provided between the end of the steel box girder and the corresponding column. The connection assembly includes an upper flange connection plate 5-1 fixed to the side of the corresponding column, a lower flange connection plate 5-4 and a web connection plate located between the upper flange connection plate and the lower flange connection plate. The web connection plate includes a first web connection plate 5-2 and a second web connection plate 5-3. The upper flange connection plate 5-1, the lower flange connection plate 5-4 and the web connection plate are all welded and fixed to the corresponding column. The upper flange connection plate and the lower flange connection plate are angle steel structures. The web connection plate is used to attach to the flat plate structure on the outer side of the corresponding web. The upper flange connection plate, the lower flange connection plate and the web connection plate surround an assembly hole for the corresponding steel box girder end to be adapted and inserted. The upper flange connection plate is connected to the upper flange plate of the steel box girder through upper bolts, the lower flange connection plate is connected to the lower flange plate through lower bolts, and the web connection plate is connected to the corresponding web of the steel box girder through bolts.

In this embodiment, the upper flange plate and the lower flange plate are welded and fixed to the upper and lower ends of the first web plate and the second web plate.

In the utility model, the prefabricated floor slab is directly supported on the supporting edge of the steel box beam. Compared with the existing technology, each frame layer can be reduced by about 30cm. For a ten-story building, 3m of height can be saved. When the total height of the building is limited, one more floor can be built for every ten floors, which has considerable economic benefits.

The steel box girder with double webs has an isosceles trapezoidal or right-angled trapezoidal cross section. Compared with traditional I-beams, it can greatly improve the torsional rigidity of the structure (closed cross section), thereby improving the bearing capacity and seismic performance of the structure. At the same time, the middle part of the web of the double web is subjected to relatively small forces, so weight-reducing holes can be set to reduce the weight of the structure, reduce materials, and reduce costs.

After the steel box beam and columns form a frame, the lateral stiffness of the structure is small, and it is difficult to meet the lateral stiffness requirements of earthquake resistance. Therefore, it is used in conjunction with steel beam supports (or ductile wall panels) to improve the lateral stiffness and earthquake resistance of the structure.

An embodiment 2 of an assembled steel box girder structural frame is shown in Figures 22~23: Embodiment 2 is different from Embodiment 1 in the following aspects: 1. The shape of the weight-reducing holes 1-5 is a polygonal structure; 2. The first web and the second web of the steel box girder both include an upper web 10 and a lower web 11, and the upper web and the lower web are welded together. The weight-reducing holes 1-5 span the upper web and the lower web in the up and down directions. This form is arranged to facilitate the production of the weight-reducing holes. For example, at the beginning of production, the upper web and the lower web are an integral structure, and then a trapezoidal corrugated line 12 is cut along the length direction of the corresponding web by wire cutting. The cutting process can be wire cutting or laser cutting. As shown in Figure 23, the trapezoidal corrugated line divides the web into an upper web and a lower web, and then the upper web and the lower web are welded at a certain distance in the length direction to form the final first web or second web.

Embodiment 3 of an assembled steel box girder structural frame is shown in Figure 24: Embodiment 3 is different from Embodiment 1 in that, in other embodiments of the utility model, the upper flange plate 1-1 of the standard steel box girder, the first web plate 1-2 of the standard steel box girder and the second web plate 1-5 of the standard steel box girder are a steel plate bending part, and for the corresponding edge steel box girder, the upper flange plate, the first web plate and the second web plate are also formed by cold-pressing and bending a piece of steel plate, and it is only necessary to weld the bottom of the first web plate of the standard steel box girder and the second web plate of the standard steel box girder to the upper end of the lower flange plate 1-3 of the standard steel box girder.

In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model according to the specific circumstances.

According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims (10)

1. An assembled steel box girder structural frame, comprising a plurality of frame layers arranged in sequence along the up-down direction, each frame layer comprising a plurality of prefabricated floor slabs and a plurality of vertically arranged columns, characterized in that: any four adjacent columns along the circumferential direction are located at the four vertex corners of a square frame, the assembled steel box girder structural frame further comprises a steel box girder fixed between two adjacent columns in the circumferential direction of the square frame, the steel box girder comprises an upper flange plate, a lower flange plate and a first web plate and a second web plate arranged between the upper flange plate and the lower flange plate, the first web plate and/or the second web plate are inclined plates extending gradually from top to bottom toward the center of the corresponding square frame, weight reduction holes are provided on the first web plate and the second web plate, a side of the lower flange plate adjacent to the center of the corresponding square frame has a support edge protruding from the corresponding web plate, A plurality of precast floor slabs are arranged in sequence along the left-right direction in each square frame, and the front and rear ends of the precast floor slabs are supported on the corresponding supporting edges of the lower flanges of two steel box girders arranged at intervals in front and behind. The left end of the precast floor slab on the far left in the square frame is supported on the corresponding supporting edge of the lower flange of the steel box girder on its left side, and the right end of the precast floor slab on the far right in the square frame is supported on the corresponding supporting edge of the lower flange of the steel box girder on its right side. The upper end of the precast floor slab is flush with the upper end of the upper flange plate of the steel box girder. The precast floor slab has a floor slab cavity extending along the front-to-back direction. The first post-cast concrete body is cast in the front and rear ends of the floor slab cavity of the precast floor slab, in the gap between the front and rear ends of the precast floor slab and the adjacent steel box girder, and in the weight-reducing holes of the steel box girder on both sides of the front and rear of the precast floor slab. 2. The assembled steel box girder structural frame according to claim 1 is characterized in that: a second post-cast concrete body is cast between the left end of the leftmost precast floor slab in the square frame and the right end of the steel box girder on the left side of the precast floor slab, and in the corresponding weight-reducing holes of the steel box girder on the left side of the precast floor slab; a third post-cast concrete body is cast between the right end of the rightmost precast floor slab in the square frame and the left end of the steel box girder on the right side of the precast floor slab, and in the corresponding weight-reducing holes of the steel box girder on the right side of the precast floor slab. 3. The assembled steel box girder structural frame according to claim 1 is characterized in that the shape of the weight-reducing holes is circular, elliptical, square, rectangular or polygonal. 4. The assembled steel box girder structural frame according to claim 1 is characterized in that: each steel box girder is divided into an edge steel box girder located at the edge positions around the assembled steel box girder structural frame and a standard steel box girder located at the internal position of the assembled steel box girder structural frame, and an eight-shaped structure with a narrow upper part and a wide lower part is formed between the first web plate and the second web plate of the standard steel box girder, the second web plate of the edge steel box girder is located on the inner side of the assembled steel box girder structural frame, the first web plate of the edge steel box girder is perpendicular to the upper flange plate and the lower flange plate of the edge steel box girder, and the second web plate of the edge steel box girder is inclinedly arranged with the upper flange plate and the lower flange plate of the edge steel box girder. 5. The assembled steel box girder structural frame according to claim 1 is characterized in that: the columns are square columns with hollow structures, and the two adjacent frame layers in the up and down directions are defined as an upper frame layer and a lower frame layer respectively, the bottom of the column of the upper frame layer is positioned and inserted into the inner hole at the top of the column of the lower frame layer, and the inner hole at the top of the column of the lower frame layer is provided with a stop end surface for cooperating with the bottom stop of the column of the upper frame layer to limit the downward movement limit of the column of the upper frame layer, and the bottom of the column of the upper frame layer is connected to the top of the column of the lower frame layer by bolts. 6. The assembled steel box girder structural frame according to claim 1 is characterized in that: the arrangement of columns of each frame layer constitutes a multi-row structure arranged at intervals along the front-to-back direction, and each row of columns includes four columns arranged at intervals along the left-to-right direction. From left to right, the columns are respectively the first column, the second column, the third column and the fourth column, the spacing between the second column and the third column is smaller than the spacing between the first column and the second column, the spacing between the first column and the second column is the same as the spacing between the third column and the fourth column, the steel box girder is connected between the upper ends of the second column and the third column, and an eight-shaped steel beam support is arranged between the steel box girder between the second column and the third column of the lower frame layer and the steel box girder between the second column and the third column of the upper frame layer. 7. The assembled steel box girder structural frame according to claim 1 is characterized in that: a connecting assembly is arranged between the end of the steel box girder and the corresponding column, the connecting assembly includes an upper flange connecting plate, a lower flange connecting plate and a web connecting plate fixed to the side of the corresponding column, the upper flange connecting plate is connected to the upper flange plate of the steel box girder by bolts, the lower flange connecting plate is connected to the lower flange plate by bolts, and the web connecting plate is connected to the corresponding web of the steel box girder by bolts. 8. The assembled steel box girder structural frame according to any one of claims 1 to 7, characterized in that the upper flange plate and the lower flange plate are welded and fixed to the upper and lower ends of the first web plate and the second web plate. 9. The assembled steel box girder structural frame according to any one of claims 1 to 7, characterized in that: the first web and the second web include an upper web and a lower web arranged up and down, the upper web and the lower web are welded together, and the weight-reducing holes span the upper web and the lower web in the up and down directions. 10. The assembled steel box girder structural frame according to any one of claims 1 to 7, characterized in that the upper flange plate, the first web plate and the second web plate are bent steel plate parts, and the lower ends of the first web plate and the second web plate are welded to the lower flange plate.