An assembled rapid temporary blocking structure for irregular atrium holes and its construction method

Abstract

The present invention discloses an assembled, rapid temporary plugging structure for irregular atrium holes and a construction method. The plugging structure comprises a steel-concrete longitudinal beam at the edge of the hole, on which a prefabricated variable-section steel main beam for plugging is disposed. The prefabricated variable-section steel main beam divides the plugging space into a side span and a middle span. Both the side span and the middle span are provided with prefabricated steel secondary beams for plugging. The ends of the prefabricated steel secondary beams in the side span are respectively connected to the reinforced concrete cross beam at the edge of the hole and the prefabricated variable-section steel main beam. The construction method includes the following steps: reserving steel bars and steel plates at the edge of the hole; reserving steel plate anchor bars; machining the prefabricated steel structure; hoisting the prefabricated variable-section steel main beam; installing the prefabricated steel secondary beam; constructing a cast-in-place reinforced concrete vertical wall; installing steel skeleton lightweight prefabricated panels and special-shaped steel plates; and constructing a finishing layer. The present invention solves the problems of difficulty, long construction period, and poor safety in rapidly performing temporary plugging of large-span holes in the limited space of underground structures.

Description

Technical Field

[0001] The present invention belongs to the field of underground building structures, and in particular relates to an assembled rapid temporary blocking structure for irregular atrium holes and a construction method. Background Art

[0002] With the continuous development of urban rail transit projects and underground space engineering construction, the center of urban development has gradually shifted from the ground to the underground, and the difficulties encountered in the construction of underground structures have also increased. Compared with ground projects, underground structure construction has more restrictions on machinery, equipment, materials and waste soil transportation, the forces are more complex, and the construction is more difficult.

[0003] During underground structure construction, the main structure is typically constructed first, followed by the installation of interval tunnels, internal secondary structures, pipelines, and equipment. During underground structure construction, temporary holes are typically reserved on each floor from top to bottom, or escalators and atrium holes are used as lifting channels. These holes are then permanently sealed after final construction is complete. However, due to construction schedules or other reasons, the space above the holes may need to be utilized for transportation or building functions. Consequently, the reserved holes can only be temporarily sealed, and subsequent construction and installation can only be carried out after the temporary sealing structure is removed.

[0004] Typically, small holes reserved in underground structure floors can be temporarily sealed with prefabricated reinforced concrete covers or steel plates. However, the larger the span of the hole to be sealed, the thicker the concrete cover or steel plate used, the heavier the deadweight, and the cumbersome installation and subsequent removal. Scaffolding generally needs to be erected from the bottom plate to the middle plate, which is tall and difficult to transport waste, resulting in a long construction period and high cost. There is no mature construction method for temporarily sealing holes in large-span, irregular atriums with spans exceeding 20m. Therefore, it is necessary to design a prefabricated, rapid, temporary sealing structure and construction method for large-span, irregular atrium holes in underground structures to address these problems. Summary of the Invention

[0005] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide an assembled rapid temporary blocking structure for irregular atrium holes and a construction method.

[0006] The technical solution of the present invention is: an assembled rapid temporary blocking structure for irregular atrium holes, comprising a hole-side steel-concrete longitudinal beam and a hole-side reinforced concrete transverse beam; the hole-side steel-concrete longitudinal beam is provided with a prefabricated variable-section steel main beam for blocking; the prefabricated variable-section steel main beam divides the blocking space into a side span and a middle span; the side span and the middle span are both provided with a prefabricated steel secondary beam for blocking; the two ends of the prefabricated steel secondary beam in the side span are respectively connected to the hole-side reinforced concrete transverse beam and the prefabricated variable-section steel main beam; the two ends of the prefabricated steel secondary beam in the middle span are connected to the parallel prefabricated variable-section steel main beam.

[0007] Furthermore, the tunnel edge steel concrete longitudinal beams are provided with embedded steel plates at intervals, and the supports at the lower ends of the prefabricated variable-section steel main beams are connected to the embedded steel plates of the tunnel edge longitudinal beams.

[0008] Furthermore, a secondary beam concrete pad is provided on the reinforced concrete beam at the edge of the hole, and a pre-embedded steel plate on the secondary beam concrete pad is provided on the upper end of the secondary beam concrete pad, and the support at the lower end of the prefabricated steel secondary beam is connected to the pre-embedded steel plate on the secondary beam concrete pad.

[0009] Furthermore, continuous cast-in-situ reinforced concrete vertical walls are provided on the hole-side steel-concrete longitudinal beams and the hole-side reinforced concrete transverse beams.

[0010] Furthermore, the top of the cast-in-situ reinforced concrete vertical wall, the upper surface of the prefabricated variable-section steel main beam, and the upper surface of the prefabricated steel secondary beam are flush.

[0011] Furthermore, the cast-in-place reinforced concrete vertical walls, prefabricated variable-section steel main beams, and prefabricated steel secondary beams are provided with steel skeleton light prefabricated panels for blocking, and a decoration layer is provided on the upper end of the steel skeleton light prefabricated panels.

[0012] Furthermore, the prefabricated variable-section steel main beam is provided with a main beam stiffening rib plate, and the main beam stiffening rib plate provides a connection basis for the connection of the prefabricated steel secondary beam.

[0013] Furthermore, a connecting plate is provided at the end side wall of the prefabricated steel secondary beam. The connecting plates are two parallel pieces, and the main beam stiffening ribs are clamped between the connecting plates by connecting bolts.

[0014] Furthermore, the cast-in-place reinforced concrete vertical wall and the prefabricated variable-section steel main beam, prefabricated steel secondary beam, and structural columns enclose an irregular area, and a special-shaped steel plate is provided in the irregular area, and the special-shaped steel plate is flush with the upper end of the steel skeleton light prefabricated plate.

[0015] A construction method for an irregular atrium hole assembled rapid temporary blocking structure comprises the following steps:

[0016] A. Reserve steel bars at the edge of the hole when constructing the underground main structure;

[0017] B. Reserve steel plates at the edge of the hole when constructing the underground main structure;

[0018] C. Reserve steel plate anchor bars on the side when constructing structural columns;

[0019] D. Processing prefabricated steel structures in factories;

[0020] E. Hoisting prefabricated variable-section steel main beam;

[0021] F. Install prefabricated steel secondary beams;

[0022] G. Construction of cast-in-place reinforced concrete vertical walls;

[0023] H. Install steel skeleton light prefabricated panels and special-shaped steel panels;

[0024] I. Construct the topmost decoration layer.

[0025] The beneficial effects of the present invention are as follows:

[0026] The present invention provides an installation platform for steel skeleton lightweight prefabricated panels and special-shaped steel plate paving through orthogonally arranged prefabricated variable-section steel main beams and prefabricated steel secondary beams, which can meet the temporary blocking requirements of various large-span irregular atrium holes, especially large-span irregular holes exceeding 20m, and solves the difficult problems of rapid temporary blocking of large-span holes in the limited space of underground structures, long construction period and poor safety.

[0027] The prefabricated variable-section steel main beam and prefabricated steel secondary beam in the present invention are all prefabricated, which reduces the difficulty of on-site welding, reduces the influence of construction errors and installation accuracy on structural stress, and improves production efficiency. The steel main beam adopts a variable section according to the stress, which meets the load-bearing safety while reducing the dead weight of the structure, improves the convenience of early installation and later dismantling construction, and effectively saves investment.

[0028] The steel skeleton light plate in the present invention can be prefabricated in a factory and laid on site, and the module selection is flexible, which can meet the modular and rapid construction requirements of the underground structure, and is conducive to shortening the construction period and reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic plan view of the structure of the prefabricated variable-section steel main beam and the prefabricated steel secondary beam of the present invention;

[0030] Figure 2 yes Figure 1 Cross-sectional view along section AA;

[0031] Figure 3 yes Figure 1 Cross-sectional view along section BB;

[0032] Figure 4 This is a partial schematic diagram of the connection between the prefabricated variable-section steel main beam and the prefabricated steel secondary beam of the present invention;

[0033] Figure 5 This is a schematic diagram of the connection of the special-shaped steel plates on the edge of the structural column in the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the embedded steel plate on the secondary beam concrete pad in the present invention;

[0035] in:

[0036] 1 Prefabricated variable-section steel main beam 2 Prefabricated steel secondary beam

[0037] 3. Steel concrete longitudinal beam at the tunnel edge 4. Embedded steel plate for longitudinal beam at the tunnel edge

[0038] 5. Reinforced concrete beam at the edge of the hole 6. Concrete pad for secondary beam

[0039] 7 Pre-embedded steel plate on secondary beam concrete pad 8 Cast-in-place reinforced concrete vertical wall

[0040] 9 Pre-buried full-length steel plate 10 holes with reserved steel bars on the side beams

[0041] 11 Steel frame light prefabricated panels 12 Decoration layer

[0042] 13 Main beam stiffening rib plate 14 Connection bolts

[0043] 15 connecting plate 16 steel plate anchor bar

[0044] 17 Special-shaped steel plate 18 Anchor bolt

[0045] 19 angle steel 20 stiffening ribs

[0046] 21 structural columns. DETAILED DESCRIPTION

[0047] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0048] like Figures 1 to 6 As shown, an irregular atrium hole assembled rapid temporary blocking structure includes a hole edge steel concrete longitudinal beam 3 and a hole edge reinforced concrete cross beam 5, wherein the hole edge steel concrete longitudinal beam 3 is provided with a prefabricated variable-section steel main beam 1 for blocking, and the prefabricated variable-section steel main beam 1 divides the blocking space into a side span and a middle span, and the side span and the middle span are both provided with a prefabricated steel secondary beam 2 for blocking, and the two ends of the prefabricated steel secondary beam 2 in the side span are respectively connected to the hole edge reinforced concrete cross beam 5 and the prefabricated variable-section steel main beam 1, and the two ends of the prefabricated steel secondary beam 2 in the middle span are connected to the parallel prefabricated variable-section steel main beam 1.

[0049] The tunnel edge steel concrete longitudinal beam 3 is provided with a tunnel edge longitudinal beam embedded steel plate 4 at intervals, and the support at the lower end of the prefabricated variable-section steel main beam 1 is connected to the tunnel edge longitudinal beam embedded steel plate 4.

[0050] A secondary beam concrete pad 6 is provided on the reinforced concrete cross beam 5 at the hole edge, and a pre-embedded steel plate 7 on the secondary beam concrete pad is provided on the upper end of the secondary beam concrete pad 6. The support at the lower end of the prefabricated steel secondary beam 2 is connected to the pre-embedded steel plate 7 on the secondary beam concrete pad.

[0051] Continuous cast-in-situ reinforced concrete vertical walls 8 are provided on the hole-side steel-concrete longitudinal beams 3 and the hole-side reinforced concrete transverse beams 5 .

[0052] The top of the cast-in-situ reinforced concrete vertical wall 8, the upper surface of the prefabricated variable-section steel main beam 1, and the upper surface of the prefabricated steel secondary beam 2 are flush.

[0053] The cast-in-situ reinforced concrete vertical wall 8 , the prefabricated variable-section steel main beam 1 , and the prefabricated steel secondary beam 2 are provided with a steel skeleton light prefabricated panel 11 for sealing, and a decoration layer 12 is provided on the upper end of the steel skeleton light prefabricated panel 11 .

[0054] The prefabricated variable-section steel main beam 1 is provided with a main beam stiffening rib plate 13 , and the main beam stiffening rib plate 13 provides a connection basis for the prefabricated steel secondary beam 2 .

[0055] The end side walls of the prefabricated steel secondary beam 2 are provided with connecting plates 15 . The connecting plates 15 are two parallel pieces, and the main beam stiffening ribs 13 are clamped between the connecting plates 15 by connecting bolts 14 .

[0056] The cast-in-place reinforced concrete vertical wall 8 and the prefabricated variable-section steel main beam 1, the prefabricated steel secondary beam 2, and the structural column 21 enclose an irregular area, and a special-shaped steel plate 17 is provided in the irregular area. The special-shaped steel plate 17 is flush with the upper end of the steel skeleton light prefabricated plate 11.

[0057] Specifically, corresponding through holes are formed in the connecting plate 15 and the main beam stiffening rib plate 13 , and connection and fixation are achieved through connecting bolts 14 .

[0058] Specifically, the prefabricated variable-section steel main beam 1 and the prefabricated steel secondary beam 2 are enclosed to form a plurality of rectangular units.

[0059] Specifically, the prefabricated variable-section steel main beam 1 includes an upper flange, a lower flange and a variable-height web. A main beam stiffening rib 13 is provided between the upper flange and the lower flange, and the main beam stiffening rib 13 is perpendicular to the variable-height web.

[0060] At the same time, the main beam stiffening ribs 13 also serve as a connection basis with the prefabricated steel secondary beams 2 .

[0061] Both ends of the prefabricated variable-section steel main beam 1 form straight portions for connection with the pre-embedded steel plates 4 of the tunnel-side longitudinal beams 3 on the tunnel-side steel-concrete longitudinal beams.

[0062] Specifically, steel plate anchor bars 16 are reserved on the hole-side steel-concrete longitudinal beam 3 , and the steel plate anchor bars 16 are connected to the embedded steel plate 4 of the hole-side longitudinal beam.

[0063] Specifically, the prefabricated steel secondary beam 2 is an I-beam, and connecting plates 15 are provided on both sides of the web of the prefabricated steel secondary beam 2. The thickness of the main beam stiffening rib plate 13 is not greater than the distance between the two connecting plates 15, so that the main beam stiffening rib plate 13 can be inserted between the two connecting plates 15.

[0064] Specifically, the upper end of the hole edge reinforced concrete beam 5 is provided with an upward convex secondary beam concrete pad 6, and the upper end of the secondary beam concrete pad 6 is provided with a secondary beam concrete pad embedded steel plate 7, and the bottom plate of the prefabricated steel secondary beam 2 is connected to the secondary beam concrete pad embedded steel plate 7.

[0065] Specifically, a steel plate anchor bar 16 is reserved on the hole edge reinforced concrete cross beam 5, and the steel plate anchor bar 16 passes through the secondary beam concrete pad 6 and is connected to the lower end of the embedded steel plate 7 on the secondary beam concrete pad.

[0066] Specifically, the upper end of the cast-in-situ reinforced concrete vertical wall 8 is provided with a pre-buried full-length steel plate 9 , which is connected to the steel skeleton light prefabricated plate 11 through the pre-buried full-length steel plate 9 .

[0067] The reserved steel bars 10 on the hole edge beams are further provided in the hole edge steel concrete longitudinal beams 3 and the hole edge reinforced concrete transverse beams 5 , and the reserved steel bars 10 on the hole edge beams enter into the cast-in-situ reinforced concrete vertical walls 8 .

[0068] Specifically, the special-shaped steel plate 17 is used to fill the unenclosed area between the structural column 21 , the prefabricated variable-section steel main beam 1 , and the prefabricated steel secondary beam 2 .

[0069] An anchor bolt 18 is provided in the structural column 21, one end of the anchor bolt 18 extends out of its outer surface, and the extended section of the anchor bolt 18 fixes the angle steel 19. The angle steel 19 is provided with a stiffening rib 20. The upper end of the angle steel 19 is connected to the special-shaped steel plate 17, and the lower end of the special-shaped steel plate 17 also forms a support foot, which is fixed to the prefabricated variable-section steel main beam 1 and the prefabricated steel secondary beam 2 through the support foot.

[0070] Specifically, the embedded steel plates 4 of the longitudinal beams at the edge of the hole are arranged at a certain interval on the steel-concrete longitudinal beams 3 at the edge of the reserved hole. The prefabricated variable-section steel main beam 1 is welded with two supports above the embedded steel plates 4 of the longitudinal beams at the edge of the hole according to the position of the two supports and spans the hole to be blocked, forming a prefabricated variable-section steel main beam 1 with intervals.

[0071] Specifically, the secondary beam concrete pad 6 and the embedded steel plate 7 on the secondary beam concrete pad are arranged on the reinforced concrete beam 5 at the edge of the reserved hole at a certain interval.

[0072] The side span of the prefabricated steel secondary beam 2 is welded to the top of the embedded steel plate 7 on the secondary beam concrete pad at one end, and the other end is connected to the prefabricated variable-section steel main beam 1, and both ends of the middle span are respectively connected to the prefabricated variable-section steel main beam 1.

[0073] The structural column 21 reserves the anchor bolts 18 at a certain interval on the side facing the hole, and angle steels 19 and stiffening ribs 20 are installed at the anchor bolts 18.

[0074] Specifically, the cast-in-place reinforced concrete vertical wall 8 is set close to the embedded steel plate 4 of the longitudinal beam at the edge of the hole and the secondary beam concrete pad 6 around the hole to be blocked. The height of the cast-in-place reinforced concrete vertical wall 8 is the same as the support height of the prefabricated variable-section steel main beam 1. The reserved steel bars 10 on the beam at the edge of the hole extend into the cast-in-place reinforced concrete vertical wall 8, and a full-length steel plate 9 is embedded thereon.

[0075] Specifically, the steel skeleton lightweight prefabricated panels 11 are laid flat on a square grid formed by the prefabricated variable-section steel main beams, the prefabricated steel secondary beams 2 and the cast-in-place reinforced concrete vertical walls 8 .

[0076] Correspondingly, the prefabricated special-shaped steel plate 17 is laid flat on the irregular area enclosed by the structural column 21, the prefabricated variable-section steel main beam 1, the prefabricated steel secondary beam 2 and the cast-in-place reinforced concrete vertical wall 8, and the angle steel 19 is located under the prefabricated special-shaped steel plate 17.

[0077] Specifically, the decoration layer 12 is arranged on the upper surface of the steel skeleton light prefabricated panel 11 and the prefabricated special-shaped steel panel 17, and the overall vertical self-vibration frequency of the blocking structure is not less than 3 Hz.

[0078] Specifically, the embedded steel plates 4 of the tunnel edge longitudinal beams and the prefabricated variable-section steel main beams 1 are evenly spaced along the reserved hole edge steel concrete longitudinal beams 3, with a spacing of 3 to 4 meters, that is, any two of the prefabricated variable-section steel main beams 1 are arranged in parallel, and the supports at both ends are respectively welded and fixed to the embedded steel plates 4 of the tunnel edge longitudinal beams on both sides.

[0079] The main beam stiffening ribs 13 are welded and fixed at even intervals on both sides of the web of the prefabricated variable-section steel main beam 1, with a spacing of 1 to 1.5 m.

[0080] Specifically, the prefabricated steel secondary beam 2, the secondary beam concrete pad 6 and the embedded steel plate 7 on the secondary beam concrete pad are evenly spaced along the reinforced concrete cross beam 5 at the edge of the hole. The maximum distance between any two prefabricated steel secondary beams 2 is 3m, or does not exceed the standard block length of the steel skeleton light prefabricated panel 11. One end of the side span of the prefabricated steel secondary beam 2 is welded and fixed to the embedded steel plate 7 on the secondary beam concrete pad, and the other end is connected and fixed to the main beam stiffening rib 13 by connecting bolts 14 and connecting plates 15. Both ends of the middle span of the prefabricated steel secondary beam 2 are connected and fixed to the main beam stiffening rib 13 by connecting bolts 14 and connecting plates 15.

[0081] Specifically, the prefabricated special-shaped steel plate 17 has a thickness of 10-20 mm, and the material type and thickness are determined according to the span and upper load calculation; the anchor bolts 18 are high-strength bolts, and the material type and diameter are determined according to the force calculation.

[0082] Specifically, the cast-in-place reinforced concrete vertical wall 8 surrounds the hole to be sealed, has a rectangular cross-sectional shape, a width of 0.2~0.3m, and a height the same as the support height of the prefabricated variable-section steel main beam 1. The diameter of the reserved steel bars 10 on the hole edge beam is determined based on the force calculation of the cast-in-place reinforced concrete vertical wall 8; the thickness of the embedded full-length steel plate 9 is 10~20mm, and both are plug-welded with the steel plate anchor bars 16. The steel plate thickness, the diameter of the steel plate anchor bars 16 and the anchoring length are determined based on the force calculation of the embedded parts.

[0083] Specifically, the standard block size of the steel skeleton lightweight prefabricated panel 11 is 1.0m×2.5 / 3.0m.

[0084] Specifically, before construction, the surfaces of steel components such as prefabricated variable-section steel main beam 1, prefabricated steel secondary beam 2, main beam stiffening rib plate 13, connecting plate 15, prefabricated special-shaped steel plate 17, angle steel 19, stiffening rib 20 should be inspected and painted with anti-rust coating. All steel components should use steel with original surface rust grade A before rust removal. The anti-corrosion requirements of steel components should comply with the requirements of "Industrial Building Anti-Corrosion Design Code" (GB50046); after installation, all steel structure surfaces should be sprayed with fire-retardant coating, using non-expansion type with a thickness of not less than 20mm. The fire-retardant coating and anti-corrosion coating should pass the compatibility test to ensure compatibility and matching. Measures should be taken to ensure the bonding strength of the fire-retardant coating with the anti-corrosion coating during construction. The bonding strength of the two should be greater than 0.05MPa. The fire resistance grade of the sealing structure is level one, and the fire resistance limit is not less than 3 hours.

[0085] Specifically, the prefabricated variable-section steel main beam 1 adopts an I-section, the support width is the same as the mid-span width, the cross-section height at the support is small, and the cross-section height at the mid-span is large. The material model and cross-section size are determined based on the beam span and upper load calculation.

[0086] Specifically, the main beam stiffening rib plate 13 is rectangular, and the material model and cross-sectional size are determined according to the force calculation; the thickness of the embedded steel plate 4 of the hole side longitudinal beam is 10~20mm, and it is plug-welded with the steel plate anchor bar 16 by perforation. The steel plate thickness, the diameter of the steel plate anchor bar 16 and the anchoring length are determined according to the force calculation of the embedded parts.

[0087] A construction method for an irregular atrium hole assembled rapid temporary blocking structure comprises the following steps:

[0088] A. Reserve steel bars at the edge of the hole when constructing the underground main structure;

[0089] B. Reserve steel plates at the edge of the hole when constructing the underground main structure;

[0090] C. Reserve steel plate anchor bars on the side when constructing structural columns;

[0091] D. Processing prefabricated steel structures in factories;

[0092] E. Hoisting prefabricated variable-section steel main beam;

[0093] F. Install prefabricated steel secondary beams;

[0094] G. Construction of cast-in-place reinforced concrete vertical walls;

[0095] H. Install steel skeleton light prefabricated panels and special-shaped steel panels;

[0096] I. Construct the topmost decoration layer.

[0097] Specifically, during step A, when constructing the underground main structure, steel bars are reserved at the edge of the hole. The specific process is as follows:

[0098] First, when constructing the underground main structure, reserve 10 steel bars on the tunnel edge beams at 3 locations of the tunnel edge steel concrete longitudinal beams;

[0099] Then, when constructing the underground main structure, reserve steel bars 10 on the reinforced concrete beams 5 at the edge of the hole;

[0100] Then, when constructing the underground main structure, steel plate anchor bars 16 for installing the embedded steel plates 4 of the tunnel edge longitudinal beams 3 are reserved.

[0101] Finally, when constructing the underground main structure, steel plate anchor bars 16 for pre-embedded steel plates 7 on the concrete pads of the secondary beams are reserved at the reinforced concrete beams 5 at the edge of the hole.

[0102] Specifically, in step B, steel plates are reserved at the edge of the hole when constructing the underground main structure. The specific process is as follows:

[0103] Reserve a pre-embedded steel plate 4 for the tunnel edge longitudinal beam at the tunnel edge steel concrete longitudinal beam 3.

[0104] Specifically, in step C, steel plate anchor bars are reserved at the top when constructing the structural column. The specific process is as follows:

[0105] When constructing the structural column 21 , anchor bolts 18 are reserved at the outer wall of the structural column 21 .

[0106] Specifically, step D involves processing the prefabricated steel structure in a factory. The specific process is as follows:

[0107] The prefabricated variable-section steel main beam 1, the main beam stiffening ribs 13, the prefabricated steel secondary beam 2, the steel skeleton light prefabricated panels 11 and the prefabricated special-shaped steel plates 17 are processed in the factory, and the processed prefabricated variable-section steel main beam 1, the main beam stiffening ribs 13, the prefabricated steel secondary beam 2, the steel skeleton light prefabricated panels 11 and the prefabricated special-shaped steel plates 17 are transported to the construction site.

[0108] Specifically, step E is to hoist the prefabricated variable-section steel main beam. The specific process is as follows:

[0109] The prefabricated variable-section steel main beam 1 is hoisted across the reserved hole, and the supports at both ends of the prefabricated variable-section steel main beam 1 are respectively welded and fixed to the embedded steel plates 4 of the longitudinal beams on both sides of the hole.

[0110] Specifically, step F installs the prefabricated steel secondary beam, and the specific process is as follows:

[0111] First, cast the secondary beam concrete pad 6 on the reinforced concrete beam 5 at the edge of the hole, and embed the steel plate 7 on the secondary beam concrete pad;

[0112] Then, one end of the side span of the prefabricated steel secondary beam 2 is welded to the embedded steel plate 7 on the secondary beam concrete pad, and the other end is connected to the main beam stiffening rib plate 13 on the prefabricated variable-section steel main beam 1;

[0113] Finally, the supports at both ends of the middle span of the prefabricated steel secondary beam 2 are connected to the main beam stiffening ribs 13 on the prefabricated variable-section steel main beam 1.

[0114] Specifically, step G is to construct cast-in-place reinforced concrete vertical walls, and the specific process is as follows:

[0115] First, tie 8 steel bars of cast-in-place reinforced concrete vertical wall around the hole to be blocked;

[0116] Then, the reinforced concrete vertical wall 8 is poured and the full-length steel plate 9 is pre-embedded.

[0117] Specifically, step H installs the steel skeleton lightweight prefabricated panels and special-shaped steel panels. The specific process is as follows:

[0118] First, the steel skeleton lightweight prefabricated panels 11 and prefabricated special-shaped steel panels 17 are laid flat and installed;

[0119] Then, the steel skeleton light prefabricated plate 11, the prefabricated special-shaped steel plate 17, the embedded full-length steel plate 9, the prefabricated variable-section steel main beam 1, and the prefabricated section steel secondary beam 2 are spot-welded and fixed.

[0120] Specifically, step 1 is to construct the topmost decoration layer, and the specific process is as follows:

[0121] The construction of the steel skeleton light prefabricated panel 11 and the upper decoration layer 12 of the prefabricated special-shaped steel plate 17 is carried out.

[0122] The present invention provides an installation platform for steel skeleton lightweight prefabricated panels and special-shaped steel plate paving through orthogonally arranged prefabricated variable-section steel main beams and prefabricated steel secondary beams, which can meet the temporary blocking requirements of various large-span irregular atrium holes, especially large-span irregular holes exceeding 20m, and solves the difficult problems of rapid temporary blocking of large-span holes in the limited space of underground structures, long construction period and poor safety.

[0123] The prefabricated variable-section steel main beam and prefabricated steel secondary beam in the present invention are all prefabricated, which reduces the difficulty of on-site welding, reduces the influence of construction errors and installation accuracy on structural stress, and improves production efficiency. The steel main beam adopts a variable section according to the stress, which meets the load-bearing safety while reducing the dead weight of the structure, improves the convenience of early installation and later dismantling construction, and effectively saves investment.

[0124] The steel skeleton light plate in the present invention can be prefabricated in a factory and laid on site, and the module selection is flexible, which can meet the modular and rapid construction requirements of the underground structure, and is conducive to shortening the construction period and reducing the construction cost.

Claims

1. A construction method for an irregular atrium hole assembly type rapid temporary blocking structure, the irregular atrium hole assembly type rapid temporary blocking structure comprising a hole edge steel concrete longitudinal beam (3) and a hole edge reinforced concrete transverse beam (5), the hole edge steel concrete longitudinal beam (3) is provided with a prefabricated variable cross-section steel main beam (1) for blocking, the prefabricated variable cross-section steel main beam (1) divides the blocking space into a side span and a middle span, the side span and the middle span are both provided with a prefabricated steel secondary beam (2) for blocking, the two ends of the prefabricated steel secondary beam (2) in the side span are respectively connected to the hole edge reinforced concrete transverse beam (5) and the prefabricated variable cross-section steel main beam (1), and the two ends of the prefabricated steel secondary beam (2) in the middle span are connected to the parallel prefabricated variable cross-section steel main beam (1); the hole edge steel concrete longitudinal beam (3) and the hole edge reinforced concrete transverse beam (5) are provided with There is a continuous cast-in-situ reinforced concrete vertical wall (8); the cast-in-situ reinforced concrete vertical wall (8) and the prefabricated variable-section steel main beam (1), the prefabricated steel secondary beam (2), and the structural column (21) enclose an irregular area, and a special-shaped steel plate (17) is provided in the irregular area, and the special-shaped steel plate (17) is flush with the upper end of the steel skeleton light prefabricated plate (11); an anchor bolt (18) is provided in the structural column (21), one end of the anchor bolt (18) protrudes from its outer surface, and the protruding section of the anchor bolt (18) fixes the angle steel (19), and a stiffening rib (20) is provided in the angle steel (19), the upper end of the angle steel (19) is connected to the special-shaped steel plate (17), and the lower end of the special-shaped steel plate (17) also forms a support foot, which is fixed to the prefabricated variable-section steel main beam (1) and the prefabricated steel secondary beam (2) through the support foot; it is characterized in that: The construction method comprises the following steps: A. Reserve steel bars at the edge of the hole when constructing the underground main structure; First, when constructing the underground main structure, a steel bar (10) is reserved on the tunnel edge beam at the tunnel edge steel concrete longitudinal beam (3); Then, when constructing the underground main structure, a reserved steel bar (10) is reserved on the reinforced concrete beam (5) at the edge of the hole; Then, when constructing the underground main structure, steel plate anchor bars (16) for installing the embedded steel plates (4) of the tunnel edge longitudinal beams are reserved at the tunnel edge steel concrete longitudinal beams (3); Finally, when constructing the underground main structure, steel plate anchor bars (16) for installing the pre-embedded steel plates (7) on the secondary beam concrete pads are reserved at the reinforced concrete beams (5) at the edge of the hole; B. Reserve steel plates at the edge of the hole when constructing the underground main structure; A pre-buried steel plate (4) for the longitudinal beam at the edge of the hole is reserved at the longitudinal beam (3) at the edge of the hole; C. Reserve steel plate anchor bars on the side when constructing structural columns; When constructing the structural column (21), anchor bolts (18) are reserved at the outer wall of the structural column (21); D. Processing prefabricated steel structures in factories; Processing the prefabricated variable-section steel main beam (1), the main beam stiffening rib plate (13), the prefabricated steel secondary beam (2), the steel skeleton light prefabricated plate (11) and the prefabricated special-shaped steel plate (17) in a factory, and transporting the processed prefabricated variable-section steel main beam (1), the main beam stiffening rib plate (13), the prefabricated steel secondary beam (2), the steel skeleton light prefabricated plate (11) and the prefabricated special-shaped steel plate (17) to the construction site; E. Hoisting prefabricated variable-section steel main beams; The prefabricated variable-section steel main beam (1) is hoisted across the reserved hole, and the supports at both ends of the prefabricated variable-section steel main beam (1) are respectively welded and fixed to the embedded steel plates (4) of the longitudinal beams on both sides of the hole; F. Install prefabricated steel secondary beams; First, a secondary beam concrete pad (6) is poured on the reinforced concrete cross beam (5) at the edge of the hole, and a steel plate (7) is embedded on the secondary beam concrete pad; Then, one end of the side span of the prefabricated steel secondary beam (2) is welded to the embedded steel plate (7) on the secondary beam concrete pad, and the other end is connected to the main beam stiffening rib plate (13) on the prefabricated variable-section steel main beam (1); Finally, the supports at both ends of the middle span of the prefabricated steel secondary beam (2) are connected to the main beam stiffening ribs (13) on the prefabricated variable-section steel main beam (1); G. Construction of cast-in-place reinforced concrete vertical walls; First, tie the cast-in-place reinforced concrete vertical wall (8) steel bars around the hole to be blocked; Then, the reinforced concrete vertical wall (8) is poured with concrete and the full-length steel plate (9) is pre-embedded; H. Install steel skeleton light prefabricated panels and special-shaped steel panels; First, the steel skeleton light prefabricated panels (11) and prefabricated special-shaped steel panels (17) are installed flatly; Then, the steel skeleton light prefabricated plate (11), the prefabricated special-shaped steel plate (17), the embedded full-length steel plate (9), the prefabricated variable-section steel main beam (1), and the prefabricated steel secondary beam (2) are spot-welded and fixed; I. Construction of the topmost finishing layer; The construction of the finishing layer (12) on the steel skeleton light prefabricated plate (11) and the prefabricated special-shaped steel plate (17) is carried out.

2. The construction method of the irregular atrium hole assembly type rapid temporary plugging structure according to claim 1 is characterized by: The tunnel edge steel concrete longitudinal beams (3) are provided with tunnel edge longitudinal beam embedded steel plates (4) at intervals, and the support at the lower end of the prefabricated variable cross-section steel main beam (1) is connected to the tunnel edge longitudinal beam embedded steel plates (4).

3. The construction method of the irregular atrium hole assembly type rapid temporary plugging structure according to claim 1 is characterized by: A secondary beam concrete pad (6) is provided on the hole-side reinforced concrete cross beam (5), a secondary beam concrete pad embedded steel plate (7) is provided on the upper end of the secondary beam concrete pad (6), and a support at the lower end of the end portion of the prefabricated steel secondary beam (2) is connected to the secondary beam concrete pad embedded steel plate (7).

4. The construction method of the irregular atrium hole assembly type rapid temporary plugging structure according to claim 1 is characterized by: The top of the cast-in-place reinforced concrete vertical wall (8), the upper surface of the prefabricated variable-section steel main beam (1), and the upper surface of the prefabricated steel secondary beam (2) are flush.

5. The construction method of the irregular atrium hole assembly type rapid temporary plugging structure according to claim 4 is characterized by: A steel skeleton light prefabricated plate (11) for blocking is provided on the cast-in-place reinforced concrete vertical wall (8), the prefabricated variable-section steel main beam (1), and the prefabricated steel secondary beam (2), and a finishing layer (12) is provided on the upper end of the steel skeleton light prefabricated plate (11).

6. The construction method of the irregular atrium hole assembly type rapid temporary plugging structure according to claim 1 is characterized by: The prefabricated variable-section steel main beam (1) is provided with a main beam stiffening rib plate (13), and the main beam stiffening rib plate (13) provides a connection basis for the connection of the prefabricated steel secondary beam (2).

7. The construction method of the irregular atrium hole assembly type rapid temporary plugging structure according to claim 1 is characterized by: A connecting plate (15) is provided at the end side wall of the prefabricated steel secondary beam (2). The connecting plates (15) are two parallel pieces, and the main beam stiffening rib plates (13) are clamped between the connecting plates (15) via connecting bolts (14).

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