An overall construction method of an over-limit beam, a lower hanging plate and a canopy

Abstract

The application relates to the technical field of concrete rain-shed pouring, in particular to an over-limit beam, a lower hanging plate and a rain-shed overall construction method, which comprises the following steps: erecting a rain-shed beam plate support, installing a rain-shed plate bottom formwork; binding rain-shed beam plate inner steel bars; installing a rain-shed beam plate side formwork and reinforcing; installing a lower hanging plate bottom formwork, a steel pipe support and a wood box; binding over-limit beam steel bars and lower hanging plate steel bars; installing over-limit beam side formwork and lower hanging plate top cover formwork and reinforcing; pouring concrete; when the concrete is poured, rain-shed beam and rain-shed plate concrete is poured first, pouring is stopped for at least 2 hours but not more than 5 hours after pouring, lower hanging plate concrete is poured to the position of the bottom of the over-limit beam before the rain-shed beam and rain-shed plate concrete is initially solidified, pouring is stopped for at least 2 hours but not more than 5 hours after pouring the lower hanging plate concrete, and over-limit beam concrete is poured again before the lower hanging plate concrete is initially solidified. The application has the effect of reducing the construction difficulty of a building structure with a beam, a lower hanging plate and a rain-shed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete canopy pouring, and in particular to an out-of-limit beam, a lower hanging plate and a canopy overall construction method. BACKGROUND

[0002] Concrete canopy pouring is partially applied to the entrance and exit of a house building structure, and rain, wind and high-falling objects can be blocked by the canopy. The concrete canopy is formed by on-site formwork and cast-in-place concrete using concrete materials. The entrance and exit are below the concrete canopy, and beams need to be arranged above the concrete canopy. For the width requirement of the frame structure plant, the span of the beam is long, so in order to increase the strength of the beam, the height and width of the beam are increased to form an out-of-limit beam. The beam in the structure is an important part of the main structure construction, and the construction quality of the beam directly affects the overall stability and safety of the structure.

[0003] In related technologies, when the beam, the lower hanging plate and the canopy of the building structure are constructed, the beam and the lower hanging plate are first constructed, the scaffold for supporting the formwork is first erected during the construction of the beam and the lower hanging plate, and the scaffold is used to support the concrete during the pouring of the lower hanging plate and the beam. After the concrete construction of the beam and the lower hanging plate is completed, the formwork and the scaffold used during the pouring of the beam and the lower hanging plate are removed; then the scaffold for constructing the canopy is erected, and since the heights of the canopy and the beam are different, the scaffold must be re-erected twice due to the height difference, and then the formwork for pouring the canopy is erected to pour the canopy. The beam, the lower hanging plate and the canopy are constructed in a separate manner.

[0004] However, the material utilization rate in the above construction process is not high, and the material needs to be transported twice, which causes great difficulty in engineering construction. SUMMARY

[0005] In order to reduce the construction difficulty of the building structure with the beam, the lower hanging plate and the canopy, the present application provides an out-of-limit beam, a lower hanging plate and a canopy overall construction method.

[0006] The present application provides an out-of-limit beam, a lower hanging plate and a canopy overall construction method, which adopts the following technical scheme:

[0007] The application discloses a whole construction method of an over-limit beam, a hanging plate and a canopy, which comprises the following steps: a, erecting a canopy beam plate support and installing a canopy plate bottom formwork; b, binding the steel bars in the canopy beam plate; c, installing a canopy beam plate side formwork and reinforcing; d, installing a hanging plate bottom formwork, a steel pipe support and a wood box; e, binding the steel bars of the over-limit beam and the hanging plate; f, installing an over-limit beam side formwork and a hanging plate top cover formwork and reinforcing; and g, pouring concrete.

[0008] By adopting the above technical scheme, the canopy beam plate support and the canopy plate bottom formwork are first completed, then the hanging plate bottom formwork and the over-limit beam side formwork are installed, so that the space where the over-limit beam, the hanging plate and the canopy are located is interconnected, and the whole pouring of the canopy, the hanging plate and the over-limit beam is realized; meanwhile, the pouring of the canopy beam and the canopy plate concrete is stopped for at least 2 hours, so that the concrete loses part of the flowability, and the pouring of the over-limit beam is realized after the pouring of the hanging plate concrete is stopped for at least 2 hours, so that the concrete of the hanging plate is transmitted to the canopy beam plate side formwork with less pressure, and the pouring of the over-limit beam is realized after the pouring of the hanging plate concrete is stopped for at least 2 hours, so that the concrete of the over-limit beam is mainly supported by the hanging plate and the wood box located on the canopy beam; meanwhile, the pouring is completed before the concrete is initially cured, so that the formation of the construction joint is reduced; meanwhile, the whole pouring of the canopy, the hanging plate and the over-limit beam can reduce the construction amount of the secondary erection, so that the construction difficulty of the building structure with the beam, the hanging plate and the canopy is reduced, and the construction cost is saved.

[0009] Preferably, in the step d, the hanging plate bottom formwork is first positioned according to the position of the hanging plate, the position mark of the hanging plate bottom formwork is completed by pulling a line, and the hanging plate bottom formwork is installed; the internal side formwork is installed on the inner side of the hanging plate bottom formwork and is reinforced and positioned; and then the wood box is positioned and the line is pulled on the inner surface of the internal side formwork.

[0010] By adopting the above technical scheme, the installation of the hanging plate is more accurate after the position of the hanging plate is marked by pulling a line; the internal side formwork is installed on the inner side of the hanging plate bottom plate, and the internal side formwork is used for installing the wood box and limiting the inner side position of the canopy and the over-limit beam.

[0011] Preferably, when installing the wooden box, first fix the right-angled triangle supports on the inner surface of the inner side mold, the right-angled triangle supports are nailed on the inner side mold from one side of the triangle supports by nails, and the right-angled triangle supports are arranged in multiple along the horizontal direction; then buckle the wooden box on the right-angled triangle supports, and then nail the wooden box on the right-angled triangle supports from the outside of the wooden box by nails.

[0012] By adopting the above technical scheme, the right-angled triangle supports are first installed on the inner side mold, the right-angled triangle supports are nailed on the inner wall of the inner side mold by nails, and then the wooden box is connected to the right-angled triangle supports, so that the wooden box is more firm and can stably support the concrete of the over-limit beam. Meanwhile, the wooden box is separated from the inner side mold when the inner side mold is disassembled, which facilitates the disassembly.

[0013] Preferably, the wooden box is pre-made and shaped by double layers of 15mm thick plywood, and square wood is used as a reinforcing framework inside the wooden box, and the square wood and the inner wall of the wooden box form a triangular reinforcing structure.

[0014] By adopting the above technical scheme, the wooden box is first reinforced by two layers, and square wood is arranged inside for reinforcement, so that the wooden box as a whole has sufficient strength and reduces the unevenness of the forming surface caused by deformation of the wooden box during pouring.

[0015] Preferably, steel plastic protection cards are installed on the steel bars in the step b of binding the steel bars in the canopy beam slab and the step e of binding the steel bars in the over-limit beam and the steel bars in the lower hanging plate.

[0016] By adopting the above technical scheme, the steel plastic protection cards are installed on the steel bars, and the concrete pads are arranged below the steel bars, so that the steel bars have a suitable protective layer and reduce the exposure of the steel bars caused by the formwork sticking to the steel bars.

[0017] Preferably, in step c, the canopy beam slab side mold is installed and reinforced, the reinforcement point positions are popped out on the canopy beam slab side mold by ink lines, and holes are formed at the reinforcement point positions for installing the tensioning bolts; in step f, the over-limit beam side mold and the lower hanging plate top cover mold are installed and reinforced, the reinforcement point positions are popped out on the over-limit beam side mold by ink lines, and holes are formed at the reinforcement point positions for installing the tensioning bolts, and at least 4 tensioning bolts are arranged at the over-limit beam, and at least 2 tensioning bolts are arranged in the lower hanging height range of the lower hanging plate for reinforcement, and the indoor side passes through the wooden box.

[0018] By adopting the above technical scheme, the tensioning bolts are installed after the reinforcement point positions are popped out on the canopy beam slab side mold and the over-limit beam side mold by ink lines and the holes are formed, so that the canopy beam slab side mold and the over-limit beam side plate are stably connected, and the wooden box is further stably supported by the through bolts at the position of the wooden box.

[0019] Preferably, double-row vertical poles are erected on the outdoor side to support and reinforce the scaffoldings, the double-row vertical poles are extended upward to the same height position of the side formwork of the super-long beam, and the steel pipe diagonal braces are fixedly connected with the double-row vertical poles, and the steel pipe diagonal braces abut against the outer side of the side formwork of the super-long beam.

[0020] By adopting the above technical scheme, the double-row vertical poles are extended upward from the scaffoldings to the same height position of the super-long beam, and the steel pipe diagonal braces are abutted between the double-row vertical poles and the outer side of the side formwork of the super-long beam, so that the side formwork of the super-long beam is stabilized by the double-row vertical poles, and displacement during pouring of the concrete is reduced.

[0021] Preferably, the slump of the concrete is controlled during pouring, and the slump of the concrete entering the pump is detected, and the slump loss value of the concrete is controlled within the range of ±20mm of the specification.

[0022] By adopting the above technical scheme, the slump of the concrete is detected during pouring, so that the extrusion of the concrete on the formwork is more accurate, and deformation of the formwork during pouring of the concrete is reduced.

[0023] Preferably, the layer thickness of the concrete during pouring is 700mm, and the pouring adopts a step-by-step layer-by-layer advancing mode, and the advancing length is 3-4m.

[0024] By adopting the above technical scheme, the concrete is advanced layer by layer, so that the concrete can be connected, the mutual connection of each layer of the concrete is ensured, and the compactness is improved.

[0025] Preferably, a settlement observation point is arranged at the bottom of the side formwork of the super-long beam before pouring of the concrete, the observation points are respectively arranged at the two end heads of the super-long beam and the middle part of the super-long beam, and temporary reinforcement measures are taken when abnormal conditions of the formwork are found during monitoring of the concrete pouring process.

[0026] By adopting the above technical scheme, the observation points are arranged at the bottom of the side formwork of the super-long beam, and the concrete pouring process is monitored, so that deformation of the formwork is found in time, and reinforcement is done, so as to ensure the safety of construction.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The space where the super-long beam, the lower hanging plate and the canopy are located is connected with each other, so as to realize overall pouring of the canopy, the lower hanging plate and the super-long beam, and the concrete at the canopy beam and the canopy plate loses part of the flowability after the first pouring of the concrete of the canopy beam and the canopy plate is stopped for at least 2 hours, the overall pouring of the canopy, the lower hanging plate and the super-long beam can reduce the construction amount of secondary erection, and the construction difficulty of the building structure with the beam, the lower hanging plate and the canopy is reduced;

[0029] 2. By using a nail to nail the inner wall of the inner side mold through a right-angle bracket, connecting the wooden box to the right-angle bracket, the wooden box is more firm, and the wooden box is separated from the inner side mold when the inner side mold is disassembled, which facilitates disassembly;

[0030] 3. By setting observation points at the bottom of the super-long beam side mold plate, monitoring during the pouring of concrete, timely releasing the deformation of the mold plate, and reinforcing, the safety of construction is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0032] Fig. 2 is a schematic diagram of the installation structure of the wooden box in the embodiment of the present application.

[0033] Mark 1, canopy beam plate support; 2, canopy plate bottom mold plate; 3, vertical rod; 4, main rib; 5, secondary rib; 6, tension bolt; 7, canopy top mold plate; 8, hanging plate bottom mold plate; 9, wooden box; 10, inner side mold; 11, canopy beam plate side mold; 12, right-angle bracket; 13, steel pipe inclined strut; 14, super-long beam side mold plate; 15, hanging plate top cover mold plate. DETAILED DESCRIPTION

[0034] The following will be described in detail in combination with the accompanying Figs. 1-2 The present application will be further described in detail.

[0035] The embodiment of the present application discloses a super-long beam, a hanging plate and a canopy overall construction method, which is used for a super-long beam with a beam height less than or equal to 2 m in construction, and the beam height is the height from the beam bottom to the beam top. The beam height in the embodiment is 1450 mm, and the beam width is 450 mm. The super-long beam, the hanging plate and the canopy overall construction method comprises the following steps: a: erecting a canopy beam plate support 1 and installing a canopy plate bottom mold plate 2; b: binding canopy beam plate internal reinforcement; c: installing a canopy beam plate side mold 11 and reinforcing; d: installing a hanging plate bottom mold plate 8, a steel pipe support and a wooden box 9; e: binding super-long beam reinforcement and hanging plate reinforcement; f: installing a super-long beam side mold plate 14 and a hanging plate top cover mold plate 15 and reinforcing; and g: pouring concrete.

[0036] Step a: set up the canopy beam plate support 1, install the canopy plate bottom formwork 2, two canopy beam plates include canopy beam and canopy plate, canopy beam is located directly below the position of the super limit beam. The canopy beam plate support 1 is built by using the fastener type steel pipe to build the scaffold, the steel pipe specification is 48*Φ3.5mm, the vertical rod 3 in the scaffold is 900mm apart longitudinally, and the vertical rod 3 is ≤450mm apart transversely. At least three vertical rods 3 are provided for the position directly below the super limit beam to improve the support strength below the super limit beam. The horizontal rod step distance in the scaffold is 1500mm, the scaffold above is used to support the canopy plate bottom formwork 2, the main rib 4 below the canopy plate bottom formwork 2 is 2 Φ48*3.5mm steel pipes tied together, the spacing between the adjacent two main ribs 4 is 500mm; the main rib 4 is fixed with the scaffold. The secondary rib 5 for supporting the canopy plate bottom formwork 2 is a 40mm*90mm wooden frame, the spacing between the adjacent two secondary ribs 5 is ≤200mm, the secondary rib 5 is used to be placed on the main rib 4 and is arranged perpendicularly with the main rib 4. The canopy plate bottom formwork 2 uses 15mm thick plywood. The base of the vertical rod 3 at the lower end should be solid, flat, can be strengthened by pouring plain concrete, has enough bearing capacity, and is used to bear all the loads of the upper part. The base or pad plate is arranged at the lower end of the vertical rod 3, and the lower end of the vertical rod 3 is provided with longitudinal and transverse sweeping rods to reduce the lateral sliding of the lower end of the vertical rod 3 and cause the deflection of the vertical rod 3.

[0037] Step b: binding the steel bars in the canopy beam plate, according to the steel bar specification, spacing and quantity specified in the design drawing, the steel bars in the canopy beam plate are processed, installed and accepted. The steel bar plastic protection card is installed on the steel bar, the steel bar plastic protection card is firmly connected with the steel bar, and the concrete cushion is arranged below the steel bar. The steel bar plastic protection card and the cushion are used to control the thickness of the steel bar protection layer, avoid the steel bar close to the formwork to cause the steel bar to leak, and the canopy plate top formwork is placed on the steel bar to make the canopy top formwork 7 press on the steel bar plastic protection card.

[0038] Step c: install the canopy beam plate side form 11 and reinforce, according to the size of the canopy beam plate, the size of the canopy beam plate form is made, and the reinforcement point position is popped out on the canopy beam plate side form 11 with ink line, the reinforcement point position is holed for installing the tension bolt 6 with the electric drill, and the lower part of the canopy beam plate side form 11 is fixed with the canopy plate bottom formwork 2.

[0039] Step d: install the lower hanging plate bottom formwork 8, steel pipe support and wooden box 9, the wooden box 9 is made of double-layer 15mm thick plywood in advance, the wooden box 9 is internally provided with square wood as a reinforcing framework, the square wood and the inner wall of the wooden box 9 are in a triangular reinforcing structure to improve the firmness of the wooden box 9. According to the position of the lower hanging plate, the transit level is used to position the lower hanging plate bottom formwork 8, the position mark of the lower hanging plate bottom formwork 8 is completed by pulling the line, and the lower hanging plate bottom formwork 8 is installed, the lower hanging plate bottom formwork 8 and the canopy top formwork 7 are supported by the steel pipe. The internal side form 10 is installed on the inner side of the lower hanging plate bottom formwork 8 and is reinforced and positioned by the steel pipe to prevent the internal side form 10 from being displaced, and the bottom of the internal side form 10 is fixed with the canopy plate bottom formwork 2. Then the wooden box 9 is positioned by the transit level and the line is pulled to the inner surface of the internal side form 10, the right-angled triangular frame 12 is fixed on the inner surface of the internal side form 10, the right-angled triangular frame 12 is nailed on the internal side form 10 from one side of the triangular frame by nails, the top of the right-angled triangular frame 12 is used to hang the wooden box 9, and a plurality of right-angled triangular frames 12 are arranged along the horizontal direction. Then the wooden box 9 is buckled on the right-angled triangular frame 12 and is nailed on the right-angled triangular frame 12 from the outer side of the wooden box 9 by nails, and the wooden box 9 is fixed. The wooden box 9 on one side of the lower hanging plate can locally support the over-limit beam, so that the concrete for pouring the over-limit beam can be relatively stable under the support of the wooden box 9.

[0040] Step e: bind the over-limit beam reinforcement and the lower hanging plate reinforcement; the over-limit beam reinforcement and the lower hanging plate reinforcement are processed, installed and accepted according to the reinforcement specifications, spacing and quantity specified in the design drawings, the reinforcement plastic protection card is installed on the reinforcement, the reinforcement plastic protection card is firmly connected with the reinforcement, and the cushion is arranged below the reinforcement, the reinforcement plastic protection card and the cushion are used to control the thickness of the reinforcement protection layer to avoid the reinforcement closely adhering to the formwork to cause the reinforcement to be missed.

[0041] Step f: install the over-limit beam side formwork 14 and the lower hanging plate top cover formwork 15 and reinforce them, the size of the formwork is made according to the height of the over-limit beam, the hanging height of the lower hanging plate on the outer side and the size of the lower hanging plate top cover, the reinforcement point positions are popped out on the over-limit beam side formwork 14 by ink line, the reinforcement point positions are holed by hand drill for installing the tensioning bolt 6, and the lower part of the over-limit beam side formwork 14 is fixed with the lower hanging plate top cover formwork 15. The tensioning bolt 6 at the over-limit beam is arranged in four rows with a spacing ≤300mm; two rows of tensioning bolts 6 are arranged for reinforcing the hanging height range of the lower hanging plate and pass through the wooden box 9 on the indoor side. The double-row vertical poles 3 are erected on the outdoor side for supporting and reinforcing, the double-row vertical poles 3 are the scaffolds upward to the position with the same height as the over-limit beam side formwork 14, and the steel pipe diagonal braces 13 are fixedly connected with the double-row vertical poles 3, so that the over-limit beam side formwork 14 is abutted on the outer side of the over-limit beam side formwork 14 by the steel pipe diagonal braces 13 to stably support the over-limit beam side formwork 14 and prevent displacement when pouring the concrete.

[0042] Step g: pouring concrete, when pouring concrete, first pour the canopy beam and canopy plate concrete, stop at least 2 hours but not more than 5 hours after pouring, pour the lower hanging plate concrete to the position of the bottom of the super limit beam before the initial setting of the canopy beam and canopy plate concrete, stop at least 2 hours after pouring the lower hanging plate concrete, and pour the super limit beam concrete before the initial setting of the lower hanging plate concrete. Strictly control the slump of the concrete during pouring to ensure the density of the concrete. The slump of the concrete at the pump inlet should be controlled within the range of ± 20mm of the specification. The concrete strength test block should be made at the pouring site. When pouring concrete, the upper layer of concrete should be poured and vibrated before the initial setting of the lower layer of concrete to prevent construction joints between the upper and lower layers. The secondary vibration method is used to improve the density and ensure the continuity. The thickness of each layer during pouring should not be too thick, and the vibration should be carried out in sequence to prevent less vibration or missed vibration. The thickness of each layer during pouring is 700mm, and the step-by-step layering method is used for pushing forward, and the pushing length is 3-4m. Before pouring the concrete, settlement observation points are set at the bottom of the super limit beam side formwork 14, three per span, at the two ends of the super limit beam and the middle of the super limit beam. Monitor during concrete pouring, monitor every 30 minutes, and record the settlement of the super limit beam. When the formwork shows abnormal conditions, take temporary reinforcement measures, if necessary, stop pouring and take measures, and then continue construction.

[0043] Compared with the method of first constructing the super limit beam and its lower hanging plate, then constructing the canopy plate and the canopy beam, the super limit beam, the lower hanging plate and the canopy are constructed integrally, which saves the cost of erecting and dismantling the super limit beam and the lower hanging plate support frame, the cost of installing the canopy secondary formwork, and the cost of the mechanical access to the site for pouring the secondary concrete. In the embodiment, the erection and dismantling of the super limit beam and the lower hanging plate support frame has a quantity of 821.32m³, and the cost of each cubic meter can be saved by 8.17 yuan; the area of the canopy secondary formwork installation is 606.8㎡, and the installation labor cost per square meter can be saved by 13.98 yuan; the quantity of the canopy secondary concrete pouring is 476m³, and the cost of the mechanical access to the site for pouring the secondary concrete per cubic meter can be saved by 19 yuan, thereby reducing the engineering cost and the labor intensity of workers. The super limit beam, the lower hanging plate and the canopy integrally pouring greatly reduces the construction waste and concrete waste generated by secondary construction, and ensures the quality of the main structure.

[0044] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method for the overall construction of an over-limit beam, a hanging plate and a canopy, characterized by: The method comprises the following steps: a) setting up canopy beam and slab supports (1) and installing canopy slab bottom formwork (2); b) tying steel bars in the canopy beam and slab; c) installing and reinforcing canopy beam and slab side formwork (11); d) installing the bottom formwork of the lower hanging slab (8), steel pipe supports and wooden boxes (9); e) tying overlimit beam reinforcement and lower hanging slab reinforcement; f) installing and reinforcing the overlimit beam side formwork (14) and the lower hanging slab top cover formwork (15); and g) pouring concrete. When pouring concrete, first pour the canopy beam and canopy slab concrete, then stop pouring for at least 2 hours but not more than 5 hours, and pour the lower hanging slab concrete to a position flush with the bottom of the overlimit beam before the canopy beam and canopy slab concrete initially set, then stop pouring for at least 2 hours but not more than 5 hours after pouring the lower hanging slab concrete, and then pour the overlimit beam concrete again before the lower hanging slab concrete initially set.

2. The method for constructing an over-limit beam, a lower hanging plate and a canopy as claimed in claim 1, characterized in that: Step d: Install the lower hanging plate bottom template (8), steel pipe support and wooden box (9), first position the lower hanging plate bottom template (8) according to the position of the lower hanging plate, pull the line to complete the position mark of the lower hanging plate bottom template (8), and install the lower hanging plate bottom template (8); install the inner side template (10) on the inner side of the lower hanging plate bottom template (8) and reinforce and position the inner side template (10); then position the wooden box (9) and pull the line on the inner surface of the inner side template (10).

3. The method for constructing an over-limit beam, a lower hanging plate and a canopy as described in claim 2, characterized in that: When the wooden box (9) is installed, a right-angled tripod (12) is first fixed on the inner surface of the inner side mold (10), and the right-angled tripod (12) is nailed to the inner side mold (10) from one side of the tripod by nails, and multiple right-angled tripods (12) are arranged along the horizontal direction; then the wooden box (9) is buckled on the right-angled tripod (12), and then nailed to the right-angled tripod (12) from the outside of the wooden box (9) by nails.

4. The method for constructing an over-limit beam, a lower hanging plate and a canopy as claimed in claim 2 or 3, characterized in that: The wooden box (9) is prefabricated with double-layer 15 mm thick plywood. The interior of the wooden box (9) uses square wood as a reinforcement frame. The square wood and the inner wall of the wooden box (9) form a triangular reinforcement structure.

5. The method for constructing an over-limit beam, a lower hanging plate and a canopy as claimed in claim 1, characterized in that: The steel bars in step b of tying the steel bars in the canopy beams and step e of tying the over-limit beam steel bars and the lower hanging plate steel bars are all installed with steel bar plastic protection cards, and concrete pads are set under the steel bars.

6. The method for constructing an over-limit beam, a lower hanging plate and a canopy as claimed in claim 1, characterized in that: Step c: Install the canopy beam and slab side formwork (11) and reinforce it, use ink lines to pop out the reinforcement point positions on the canopy beam and slab side formwork (11), and drill holes at the reinforcement point positions for installing tension bolts (6); Step f: Install the over-limit beam side formwork (14) and the lower hanging plate top cover formwork (15) and reinforce them, use ink lines to pop out the reinforcement point positions on the over-limit beam side formwork (14), and drill holes at the reinforcement point positions for installing tension bolts (6), at least 4 tension bolts (6) are set at the over-limit beam; at least 2 tension bolts (6) are set in the lower hanging plate lower hanging height range for reinforcement, and the indoor side passes through the wooden box (9).

7. The method for constructing an over-limit beam, a lower hanging plate and a canopy as claimed in claim 6, characterized in that: A double row of vertical poles (3) is set up on the outdoor side for support and reinforcement. The double row of vertical poles (3) is a scaffolding that extends upward to a position at the same height as the over-limit beam side formwork (14). The double row of vertical poles (3) are fixedly connected to the double row of vertical poles (3) with steel pipe diagonal braces (13), and abut against the outer side surface of the over-limit beam side formwork (14) through the steel pipe diagonal braces (13).

8. The method for constructing an over-limit beam, a lower hanging plate and a canopy as claimed in claim 1, characterized in that: Control the slump of concrete during the pouring process, test the slump of concrete at the pump inlet, and control the slump loss value of concrete within the standard range of ±20㎜.

9. The method for constructing an over-limit beam, a lower hanging plate and a canopy as claimed in claim 1, characterized in that: The layer thickness during concrete pouring is 700mm, and the pouring adopts a step-by-step layered advancement with an advancement length of 3 to 4m.

10. The method for constructing an over-limit beam, a lower hanging plate and a canopy as claimed in claim 1, characterized in that: Before pouring concrete, settlement observation points are set at the bottom of the over-limit beam side formwork (14), the observation points being respectively at the two ends of the over-limit beam and the middle of the over-limit beam; monitoring is carried out during the concrete pouring process, and temporary reinforcement measures are taken when monitoring finds any abnormality in the formwork.

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