Fabricated steel-concrete composite supporting system construction system

Abstract

The invention relates to the technical field of foundation pit supporting, in particular to an assembly type steel-concrete composite supporting system construction system which comprises a circle of steel enclosing purlins which are attached to the inner wall of a foundation pit and are spliced in multiple sections, a plurality of opposite supports for supporting the inner walls of the two opposite sides of the foundation pit, a concrete waist beam for supporting the two side walls of the sharp corner of the foundation pit and a plurality of angle supports. One end of the steel enclosing purlin is anchored into the concrete waist beam; the bottom faces of the angle braces are detachably connected with a waist beam pouring formwork, the adjacent angle braces and the waist beam building formwork define waist beam pouring grooves, the steel enclosing purlins are provided with inner cavities, notches are formed in the side walls of the steel enclosing purlins, the pouring grooves are communicated with the inner cavities of the steel enclosing purlins through the notches, and waist beam steel bars are laid on the notches. The side wall of the steel structure is used for rapidly forming the concrete pouring groove in the foundation pit in a surrounding mode, after the pouring groove penetrates through the interior of the steel enclosing purlin, the reinforcing steel bars are laid in the formed communicating groove, concrete is poured into the communicating groove to form the concrete waist beam, the purpose that one end of the steel enclosing purlin is anchored into the concrete waist beam is achieved, and therefore the supporting rigidity of the angle brace is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and in particular to a construction system of an assembled steel-concrete composite support system. Background Art

[0002] Urban subway construction in my country is primarily concentrated in the economically developed eastern coastal and riverside regions. Construction often encounters complex strata composed of various types of high-water-content soft soil and bedrock, characterized by being "soft on top, hard on the bottom, and experiencing significant variations in undulation." During underground construction, the selection of foundation pit support and foundation structures and the selection of construction techniques are primarily influenced by stratum conditions. The economic and time commitment associated with these complex strata often increases exponentially, directly impacting project profitability. Therefore, addressing construction challenges and developing relevant new technologies and processes are essential requirements.

[0003] The foundation pit is supported by bored cast-in-place piles, with either one reinforced concrete support or one reinforced concrete support plus one steel support installed depending on the excavation depth. High-pressure jet jet piles are used for the water-stop curtain. Cast-in-place reinforced concrete supports offer advantages such as flexible design and high support rigidity, but also have drawbacks such as heavy weight, a long construction cycle, non-recyclability, and the generation of large amounts of construction waste. Steel supports offer advantages such as easy assembly and disassembly and multiple uses, but also have limitations such as relatively limited size and specifications, lack of flexibility to adapt to the shape of the foundation pit, significant impact of structural defects and environmental factors on support rigidity, and short support spans.

[0004] For foundation pits that meet the prerequisites for using prefabricated support structures, the prefabricated supports currently available on the market are all steel supports. These have limited support stiffness and require densely packed arrangements to meet support requirements. This poses a risk of severely squeezing construction space and impacting construction efficiency. Therefore, developing a prefabricated steel-concrete composite support system, combining the advantages of both concrete and steel supports, is key to improving construction efficiency, reducing economic costs, and mitigating environmental impact. Summary of the Invention

[0005] In view of this, the present invention provides a prefabricated steel-concrete composite support system construction system to solve the problem of limited support stiffness of the currently widely used simple steel support.

[0006] The present invention provides an assembled steel-concrete composite support system construction system, comprising a steel purlin arranged around the inner wall of a foundation pit and spliced ​​in multiple sections, a plurality of braces supporting the inner walls on opposite sides of the foundation pit, a concrete waist beam supporting the walls on both sides at the sharp corners of the foundation pit, and a plurality of angle braces, one end of the steel purlin is anchored in the concrete waist beam; the bottom surface of the angle brace is detachably connected to the waist beam casting formwork, and the adjacent angle braces and the waist beam building formwork form a waist beam casting trough, the steel purlin has an inner cavity, and the side walls of the steel purlin are provided with a notch, the notch connects the casting trough and the inner cavity of the steel purlin, and waist beam steel bars are laid in the casting trough and the inner cavity of the connected steel purlin.

[0007] Optionally, the bracing includes steel bracing and concrete bracing, the bottom surface of the steel bracing is detachably connected to the bracing casting formwork, the adjacent steel bracings and the bracing casting formwork form a bracing casting trough, the bracing casting trough passes through the inner cavity of the steel purlin, and bracing steel bars are laid in the bracing casting trough and the inner cavity of the steel purlin connected thereto.

[0008] Optionally, each section of the steel purlin includes two layers of H-shaped steel distributed upper and lower, and a blocking plate arranged at the longitudinal end of each section of the steel purlin; the lower half of the upper H-shaped steel and the upper half of the lower H-shaped steel form the inner cavity of the steel purlin.

[0009] Optionally, a first connecting steel bar is provided in the waist beam casting trough, and the first connecting steel bar is vertically bundled and connected to the waist beam steel bar. The end of the first connecting steel bar passes downward through the gap between the waist beam casting formwork and the angle brace and then connects to the waist beam steel bars in other waist beam casting troughs, or connects to the steel bars in the building floor intervals in the foundation pit.

[0010] Optionally, a second connecting steel bar is provided in the bracing casting trough, and the second connecting steel bar is vertically bundled and connected to the bracing steel bars. The end of the second connecting steel bar passes downward through the gap between the bracing casting formwork and the brace and then connects to the bracing steel bars in other bracing casting troughs, or connects to the steel bars in the building floor intervals in the foundation pit.

[0011] Optionally, the brace and the angle brace both include straight long rods and connecting blocks detachably connected between the rods and the side walls of the steel purlins; the rods include two parallel steel sections and a connecting piece detachably connected between the two steel sections.

[0012] Optionally, the braces and part of the angle braces are formed by splicing multiple sections of the rods and a hydraulic rod, and the hydraulic rod is detachably connected between two sections of the rods.

[0013] Optionally, a concrete baffle is provided on the side of the hydraulic rod, one end of the concrete baffle is fixed relative to one of the rods, and the other end of the concrete baffle is movable relative to the other rod.

[0014] Optionally, both sides of the steel section are concave to form grooves, and the cross-section is I-shaped. The two ends of the connecting piece extend into the grooves of the steel section on both sides respectively. There is a distance between the steel sections connected by the two ends of the connecting piece, and the distance is greater than the moving distance required for the steel section to be demolded from the concrete.

[0015] Optionally, the steel section includes an end plate, a top plate, a bottom plate and a rib plate connected together, the end plates are located at both ends of the length direction of the steel section, the top plate, the rib plate and the bottom plate are distributed in sequence from top to bottom to form an I-beam, and the top plate, the bottom plate and the end plates are all provided with bolt mounting holes.

[0016] The technical solution of the present invention has the following advantages:

[0017] 1. As the prefabricated steel structure has the characteristics of flexible assembly (the spacing between adjacent braces can be flexibly adjusted, the spacing between adjacent angle braces can be flexibly adjusted, and the lengths of the braces and angle braces can be flexibly adapted to the size of the foundation pit), the side walls of the steel structure are used to quickly form a concrete casting trough in the foundation pit. After the casting trough is opened up inside the steel purlin, steel bars are laid in the formed connecting trough and concrete is poured into it to form a concrete waist beam, so as to achieve the purpose of anchoring one end of the steel purlin into the concrete waist beam, thereby greatly improving the support stiffness of the angle brace.

[0018] 2. Similar to the angle brace composed of steel angle brace and concrete angle brace, the cross brace is also composed of steel cross brace and concrete cross brace, which greatly improves the support stiffness of the cross brace; the section of steel purlin supported by the steel cross brace is anchored into the concrete cross brace, which greatly improves the compression and deformation resistance of the steel purlin.

[0019] 3. The connecting steel bars are tied together with the steel bars in multiple concrete pouring troughs to make the shear resistance of the formed reinforced concrete bracing and reinforced concrete angle bracing in the width direction stronger.

[0020] 4. Both the steel braces and steel angle braces are detachable and can be separated from the concrete support structure. The connecting steel bars extending from the concrete support structure enable the concrete support structure to be anchored into the interval floor slab between the upper and lower adjacent floors in the foundation pit, thereby shortening the construction time of the interval floor slab, eliminating the cost of lifting the concrete support structure out of the foundation pit, increasing the structural strength of the interval floor slab, and reducing the generation of construction waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a top view of the construction system of the assembled steel-concrete composite support system in an embodiment of the present invention.

[0023] Figure 2 It is a three-dimensional diagram of the construction system of the assembled steel-concrete composite support system in an embodiment of the present invention.

[0024] Figure 3 Schematic diagram of the connection between the bracket and the steel purlin in an embodiment of the present invention.

[0025] Figure 4 2 is a schematic structural diagram of a steel purlin in an embodiment of the present invention.

[0026] Figure 5 It is a schematic structural diagram of the corner brace and waist beam casting trough in an embodiment of the present invention.

[0027] Figure 6 It is a structural schematic diagram of a concrete waist beam in an embodiment of the present invention.

[0028] Figure 7 It is a structural schematic diagram of a concrete pouring template in an embodiment of the present invention.

[0029] In the figure: bracket 1, steel purlin 2, notch 2a, H-shaped steel 21, blocking plate 22, brace 3, steel brace 31, concrete brace 32, angle brace 4, corner pad 41, concrete waist beam 5, waist beam casting groove 6, waist beam steel bar 7, brace casting groove 8, brace steel bar 9, first connecting steel bar 10, second connecting steel bar 11, rod 12, connecting member 121, steel section 122, groove 122a, end plate 1221, top plate 1222, rib 1223, bottom plate 1224, connecting block 13, hydraulic rod 14, concrete baffle 15, concrete casting template 16, notch 16a. DETAILED DESCRIPTION

[0030] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, and not all, of the embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the description of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0031] Unless otherwise specified or limited, the terms "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances.

[0032] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0033] The terms "first," "second," "third," etc. are merely used to distinguish elements of similar nature and do not indicate or imply relative importance or a particular order.

[0034] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0035] Please refer to Figures 1 to 4 An embodiment of the present invention provides a prefabricated steel-concrete composite support system construction system, including a bracket 1, a steel purlin 2, a brace 3, a corner brace 4 and a concrete waist beam 5.

[0036] Please refer to Figure 3 There are multiple brackets 1, preferably triangular brackets, and each bracket 1 is fixed to the inner wall of the foundation pit (underground continuous wall) with expansion bolts, keeping the spacing uniform. The steel purlin 2 is placed on the bracket 1 and placed around the inner wall of the foundation pit. The steel purlin 2 is hollow inside; please refer to Figure 4 Preferably, the upper and lower layers of H-shaped steel 21 form a steel purlin 2, and the lower half of the upper H-shaped steel 21 and the upper half of the lower H-shaped steel 21 form the inner cavity of the steel purlin 2; the steel purlin 2 is spliced ​​together by multiple sections in the length direction, and each section of the steel purlin 2 is provided with a blocking plate 22 at both ends in the length direction. The blocking plate 22 can be fixed to the end of the steel purlin 2 by electric welding, and the blocking plate 22 seals the inner cavity of the steel purlin 2.

[0037] Please refer to Figure 5, multiple angle braces 4 are supported between the steel purlins 2 on both sides at the sharp corners of the foundation pit, and the angle braces 4 include three types: the first is a corner pad 41 clamped at the sharp corners of the steel purlin 2, and the corner pad 41 is preferably connected to the steel purlins 2 on both sides by a detachable bolt connection method; the second is a straight long rod 12, which can also be formed by splicing multiple short rods 12. The two ends of the rod 12 in the length direction are detachably connected with connecting blocks 13. The function of the connecting block 13 is to detachably connect the rod 12 to the side wall of the steel purlin 2; the third is one or two rods 12 connected to a hydraulic rod 14, the base shell of the hydraulic rod 14 is detachably connected to the end of one of the rods 12, and the piston rod end of the hydraulic rod 14 is detachably connected to the connecting block 13 or the end of another rod 12. The corner pad 41 is the angle support closest to the corner of the foundation pit, the second angle support is close to the corner pad 41, and the third angle support is farthest from the corner pad 41. Among the three types of angle supports 4, the angle support 4 has at least the second type, and the other two types are further options.

[0038] Please refer to Figure 5 After the angle brace 4 is built, the waist beam casting formwork is detachably connected to the bottom surface of the angle brace 4, so that the opposite sides of the adjacent angle braces 4 and the upper surface of the waist beam building formwork form a waist beam casting groove 6; then a notch 2a that passes through the inner cavity of the steel surrounding purlin 2 is cut out on the side wall of the steel surrounding purlin 2 (or a notch 2a is reserved in advance on the H-shaped steel 21 that constitutes the steel surrounding purlin 2). The notch 2a connects the waist beam casting groove 6 and the inner cavity of the steel surrounding purlin 2; then the hydraulic rod 14 works to apply a certain prestress to the inner wall of the foundation pit; then waist beam steel bars 7 are laid in the inner cavity of the waist beam casting groove 6 and the steel surrounding purlin 2 connected thereto, and the waist beam steel bars 7 are laid along the inner cavity length direction of the waist beam casting groove 6 and the steel surrounding purlin 2. The waist beam steel bars 7 are multiple steel bars in an array tied into a steel cage shape; finally, concrete is poured into the waist beam casting groove 6, and the concrete is poured into the inner cavity of the steel surrounding purlin 2. After the concrete hardens, a concrete waist beam 5 is formed (see Figure 6 ), one end of the steel purlin 2 is anchored into the concrete waist beam 5.

[0039] The concrete waist beam 5 is equivalent to the concrete angle brace, and the angle brace 4 is equivalent to the steel angle brace. Figure 1 The brace 3 of the present invention also includes a steel brace 31 and a concrete brace 32: a plurality of steel braces 31 are supported on the inner walls of the foundation pit on both sides, and each steel brace 31 is formed by splicing two straight long rods 12 and a hydraulic rod 14, and the hydraulic rod 14 is detachably connected between the two sections of rods 12; the bottom surface of the steel brace 31 is detachably connected to the brace casting template, and the facing surfaces of adjacent steel braces 31 and the upper surface of the brace casting template form a brace casting groove 8, and a notch 2a is provided on the side wall of the steel purlin 2 (see Figure 2), the bracing casting groove 8 passes through the groove 2a to the inner cavity of the steel perimeter purlin 2, and the hydraulic rod 14 is used to apply a certain prestress to the inner wall of the foundation pit. A steel cage made of bracing steel bars 9 is laid in the bracing casting groove 8 and the inner cavity of the connected steel perimeter purlin 2. Concrete is poured into the bracing casting groove 8, and the concrete is poured into the inner cavity of the steel perimeter purlin 2. After the concrete hardens, a concrete brace 32 is formed, and a small section of the steel perimeter purlin 2 is anchored in the concrete brace 32.

[0040] Please refer to Figure 1 Similar to the angle brace 4 composed of steel angle braces and concrete angle braces, the brace 3 is also composed of steel braces 31 and concrete braces 32, which greatly improves the supporting stiffness of the brace 3; among them, a section of steel purlin 2 supported by the steel brace 31 is anchored in the concrete brace 32, which greatly improves the compression and deformation resistance of the steel purlin 2.

[0041] Please refer to Figure 1 or Figure 5 Concrete baffles 15 are provided on the sides of the hydraulic rods 14 in the angle braces 4 and the opposite braces 3. One end of the concrete baffle 15 is fixed relative to one rod 12, and the other end of the concrete baffle 15 is movable relative to the other rod 12 (or relative to the connecting block 13). The bottom of the concrete baffle 15 is seamlessly abutted against the concrete pouring formwork. The function of the concrete baffle 15 is to prevent concrete leakage at the position where the hydraulic rods 14 are set in the angle braces 4 and the opposite braces 3.

[0042] The prefabricated steel-concrete composite support system construction system provided by the embodiment of the present invention has the characteristics of flexible assembly of prefabricated steel structures (the spacing between adjacent braces 3 can be flexibly adjusted, the spacing between adjacent angle braces 4 can be flexibly adjusted, and the lengths of the braces 3 and the angle braces 4 can be flexibly adapted to the size of the foundation pit). Therefore, the side walls of the steel structure are used to quickly form a concrete casting trough in the foundation pit, and after the casting trough is opened through the interior of the steel purlin 2, steel bars are laid in the formed connecting trough and concrete is poured into it to form a concrete waist beam 5, so as to achieve the purpose of anchoring one end of the steel purlin 2 into the concrete waist beam 5, thereby greatly improving the support stiffness of the angle brace 4.

[0043] Please refer to Figure 5Furthermore, a first connecting steel bar 10 is provided in the waist beam casting trough 6. The first connecting steel bar 10 is vertically tied and connected to the waist beam steel bar 7. The end of the first connecting steel bar 10 is bent downward and passes through the gap between the waist beam casting formwork and the angle brace 4 to connect to the waist beam steel bars 7 in other waist beam casting troughs 6, or to the steel bars in the intervals between building floors in the foundation pit. Specifically, the first connecting steel bar 10 can be a whole steel bar that simultaneously connects the waist beam steel bars 7 in multiple waist beam casting troughs 6; or each waist beam steel bar 7 in each waist beam casting trough 6 is connected to a first connecting steel bar 10, and the first connecting steel bars 10 in two different waist beam casting troughs 6 are connected by welding, steel sleeve anchoring, etc., or the first connecting steel bar 10 is connected to the steel bars in the intervals between building floors in the foundation pit.

[0044] Please refer to Figure 1 Similarly, a second connecting steel bar 11 is provided in the bracing casting trough 8. The second connecting steel bar 11 is vertically tied and connected to the bracing steel bar 9. The end of the second connecting steel bar 11 is bent downward and passes through the gap between the bracing casting formwork and the bracing 3 to connect to the bracing steel bars 9 in other bracing casting troughs 8, or to the steel bars in the intervals between building floors in the foundation pit. Specifically, the second connecting steel bar 11 can be a whole steel bar that simultaneously connects multiple bracing steel bars 9 in the bracing casting troughs 8; or each bracing steel bar 9 in the bracing casting trough 8 is connected to a second connecting steel bar 11, and the second connecting steel bars 11 in two different bracing casting troughs 8 are connected by welding, steel sleeve anchoring, etc., or the second connecting steel bar 11 is connected to the steel bars in the intervals between building floors in the foundation pit.

[0045] The first connecting steel bar 10 and the second connecting steel bar 11 are connected in series with the steel bars in multiple casting troughs at the same time. Their function is to bundle and connect the connecting steel bars with the steel bars in multiple casting troughs, so that the shear performance of the formed reinforced concrete bracing and reinforced concrete angle bracing in the width direction is stronger.

[0046] The purpose of connecting the first connecting steel bars 10 and the second connecting steel bars 11 with the steel bars in the intervals between the building floors in the foundation pit is: since the steel braces 31 and the steel angle braces 4 are both detachable and can be separated from the concrete support structure, after the steel structure is dismantled, the connecting steel bars extending from the concrete support structure enable the concrete support structure to be anchored into the interval floor slab between the upper and lower adjacent floors in the foundation pit, thereby shortening the construction time of the interval floor slab, eliminating the cost of lifting the concrete support structure out of the foundation pit, increasing the structural strength of the interval floor slab, and reducing the generation of construction waste.

[0047] Please refer to Figure 7The first connecting steel bar 10 and the second connecting steel bar 11 pass downward through the narrow gap 16a on both sides of the concrete pouring formwork 16 (referring to the support pouring formwork and the waist beam pouring formwork) and the narrow gap surrounded by the steel structure (referring to the support 3 and the angle support 4). Before pouring concrete, soft items such as cloth strips and rubber can be used to plug the gap to stop leakage and prevent concrete from leaking.

[0048] Please refer to Figure 1 Specifically, the rod 12 constituting the angle brace 4 and the steel brace 31 includes two parallel steel sections 122 and a connector 121 detachably connected between the two steel sections 122; please refer to Figure 7 , both sides of the steel section 122 are concave to form grooves 122a. Since concrete will be formed in the grooves 122a, in order to facilitate the demoulding of the concrete from the grooves 122a after the first layer of the supporting structure has completed its supporting function and smoothly remove the steel section 122, the inner wall shape of the grooves 122a is a shape that is convenient for demoulding; the cross-section of the steel section 122 is I-shaped, and the two ends of the connecting piece 121 are respectively extended into the grooves 122a of the steel sections 122 on both sides. The steel section 122 includes an end plate 1221, a top plate 1222, a bottom plate 1224 and a rib plate 1223 that are connected as one body. The end plate 1221 is located at both ends of the length direction of the steel section 122, and the top plate 1222, the rib plate 1223 and the bottom plate 1224 are distributed from top to bottom to form I-steel, and bolt mounting holes are provided on the top plate 1222, the bottom plate 1224 and the end plate 1221; there is a gap between the steel sections 122 connected at both ends of the connector 121, and the distance of the gap is greater than the moving distance required for demoulding the steel section 122 and the concrete. The purpose of this design is that after releasing the bolts between the connector 121 and the steel section 122, the connector 121 can be rotated, and then the connector 121 can be taken out from the gap, and then the two steel sections 122 can be moved toward each other, so that the concrete structure can be demoulded from the steel section 122, thereby facilitating the smooth removal of the steel structure in the supporting structure of each layer after the building under the supporting structure of each layer in the foundation pit is built.

[0049] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the scope of protection of the present invention.

Claims

1. A prefabricated steel-concrete composite support system construction system, characterized in that: It includes a steel purlin that is arranged around the inner wall of the foundation pit and is spliced ​​in multiple sections, a plurality of braces supporting the inner walls on opposite sides of the foundation pit, a concrete waist beam supporting the walls on both sides of the foundation pit at the sharp corners, and a plurality of angle braces. One end of the steel purlin is anchored in the concrete waist beam; the bottom surface of the angle brace is detachably connected to the waist beam casting formwork, and the adjacent angle braces and the waist beam building formwork form a waist beam casting trough. The steel purlin has an inner cavity, and the side walls of the steel purlin are provided with notches, and the notches connect the casting trough and the inner cavity of the steel purlin. Waist beam steel bars are laid in the casting trough and the inner cavity of the connected steel purlin.

2. The prefabricated steel-concrete composite support system construction system according to claim 1, characterized in that: The braces include steel braces and concrete braces. The bottom surface of the steel braces can be detachably connected to the brace casting formwork. The adjacent steel braces and the brace casting formwork form a brace casting trough. The brace casting trough passes through the inner cavity of the steel purlin. Brace steel bars are laid in the brace casting trough and the inner cavity of the steel purlin connected thereto.

3. The assembled steel-concrete composite support system construction system according to claim 1, characterized in that: Each section of the steel purlin includes two layers of H-shaped steel distributed upper and lower, and a blocking plate arranged at the longitudinal end of each section of the steel purlin; the lower half of the upper H-shaped steel and the upper half of the lower H-shaped steel form the inner cavity of the steel purlin.

4. The assembled steel-concrete composite support system construction system according to claim 1, characterized in that: A first connecting steel bar is provided in the waist beam casting trough, and the first connecting steel bar is vertically bundled and connected to the waist beam steel bar. The end of the first connecting steel bar passes downward through the gap between the waist beam casting formwork and the angle brace and then connects to the waist beam steel bars in other waist beam casting troughs, or connects to the steel bars in the building floor intervals in the foundation pit.

5. The assembled steel-concrete composite support system construction system according to claim 2, characterized in that: A second connecting steel bar is provided in the bracing casting trough, and the second connecting steel bar is vertically bundled and connected to the bracing steel bar. The end of the second connecting steel bar passes downward through the gap between the bracing casting formwork and the brace and then connects to the bracing steel bars in other bracing casting troughs, or connects to the steel bars in the building floor intervals in the foundation pit.

6. The assembled steel-concrete composite support system construction system according to claim 1, characterized in that: The braces and the angle braces both include straight and long rods, and connecting blocks detachably connected between the rods and the side walls of the steel purlins; the rods include two parallel steel sections, and connecting pieces detachably connected between the two steel sections.

7. The assembled steel-concrete composite support system construction system according to claim 6, characterized in that: The braces and part of the angle braces are formed by splicing multiple sections of the rods and a hydraulic rod, and the hydraulic rod is detachably connected between two sections of the rods.

8. The assembled steel-concrete composite support system construction system according to claim 7, characterized in that: A concrete baffle is provided on the side of the hydraulic rod, one end of the concrete baffle is fixed relative to one of the rods, and the other end of the concrete baffle is movable relative to the other rod.

9. The assembled steel-concrete composite support system construction system according to claim 6, characterized in that: The two sides of the steel section are concave to form grooves, and the cross-section is I-shaped. The two ends of the connecting piece extend into the grooves of the steel section on both sides respectively. There is a distance between the steel sections connected by the two ends of the connecting piece, and the distance is greater than the moving distance required for the steel section to be demolded from the concrete.

10. The assembled steel-concrete composite support system construction system according to claim 9, characterized in that: The steel section includes an end plate, a top plate, a bottom plate and a rib plate connected as one body. The end plates are located at both ends of the steel section in the length direction. The top plate, rib plate and bottom plate are distributed in sequence from top to bottom to form an I-beam. Bolt mounting holes are provided on the top plate, bottom plate and end plates.

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