High-speed rail passenger station large-span hollow floor construction method

Abstract

The invention relates to a construction method for a large-span hollow floor of a high-speed rail passenger station. The specific construction method comprises the steps that S1, a formwork support is erected, and a formwork is laid; s2, first reinforcing steel bars forming rib beams and second reinforcing steel bars forming a bottom plate are bound on the formwork; s3, firmly binding the first reinforcing steel bars of the ribbed beams and the keels of the formworks through iron wires, and binding the rectangular square tubes above the second reinforcing steel bars of the bottom plate; s4, a hollow box body is placed on the rectangular square pipes, third steel bars forming a panel of the hollow floor system are bound, and then an anti-floating support is placed between the third steel bars of the panel and the top face of the hollow box body; and S5, concrete pouring is carried out in two stages. The invention belongs to the technical field of hollow floor construction, a hollow box body is arranged on a rectangular square tube, and the top of the box body is pressed through an anti-floating support to form a hollow structure so as to reduce self weight and resist concrete buoyancy.

Description

TECHNICAL FIELD

[0001] The present application relates to the hollow floor construction technical field, especially relates to a large-span hollow floor construction method for high-speed railway station. BACKGROUND

[0002] With the rapid development of high-speed railway line construction in China, the currently under construction large high-speed railway station has the characteristics of large span, complex shape and small construction site, and the construction difficulty is great.

[0003] The common hollow floor construction method in the industry is to set up a support frame, use ordinary formwork to support and pour concrete. This construction method is not conducive to cost saving and complicates the process, the formwork setting is relatively complex during the construction process, and the size deviation cannot be guaranteed, and the formwork removal is also a difficult work. SUMMARY

[0004] Therefore, it is necessary to provide a large-span hollow floor construction method for high-speed railway station, and the specific technical scheme is as follows.

[0005] A large-span hollow floor construction method for high-speed railway station, the specific construction method comprises the following steps: S2, binding the first steel bars constituting the ribbed beams and the second steel bars constituting the bottom plates on the formwork; S3, binding the first steel bars of the ribbed beams and the keels of the formwork firmly by iron wire, and binding the rectangular square tubes above the second steel bars of the bottom plates; S4, placing the hollow box on the rectangular square tube, binding the third steel bars constituting the panels of the hollow floor, and then placing the anti-floating support between the third steel bars of the panels and the top surface of the hollow box; S5, pouring the hollow floor concrete, and the concrete pouring is divided into two stages, the pouring height of the first stage is 100-150mm, the second stage is completed before initial setting, and the pouring time interval of the second stage and the first stage is 80-100 minutes.

[0006] Further, the specific construction method of fixing the first steel bars and setting the rectangular square tubes in the step S3 comprises the following steps: after the first steel bars of the ribbed beams are bound, the first steel bars and the keels of the lower formwork are fixed by using 14# iron wire; four square tubes are arranged in the well grid surrounded by the ribbed beams arranged in longitudinal and transverse directions to form the rectangular square tubes for supporting the hollow box, and the four square tubes are fixed with the second steel bars on the formwork by iron wire.

[0007] Further, the first steel bars of the ribbed beams and the second steel bars of the bottom plates are firmly bound by iron wire, and the second steel bars of the bottom plates and the keels of the lower formwork are fixed.

[0008] Further, the specific construction method of placing the anti-floating support in the step S4 comprises: placing eight anti-floating supports above each hollow box, and fixing the top of the anti-floating support with the third steel bars of the face plate.

[0009] Further, the anti-floating support comprises a pressing plate, a vertical rod and an inclined support rod, the vertical rod is vertically arranged on the pressing plate, the bottom of the inclined support rod is provided with a sleeve in sliding connection with the vertical rod, and the inclined support rod can be adjusted in height and rotated left and right to abut against the third steel bars of the face plate.

[0010] Further, the specific construction method of pouring the concrete in the step S5 comprises: before starting the first stage of pouring the concrete, connecting the delivery pipe and the discharge pipe with the bottom of the hollow box, injecting liquid into the hollow box, and the liquid height in the box is 30-50 mm; after the first stage of pouring the concrete is completed, gradually discharging the liquid in the hollow box through the discharge pipe before starting the second stage of pouring the concrete.

[0011] Further, the specific construction method of pouring the concrete further comprises: when the second stage of pouring the concrete is performed, injecting compressed air into the hollow box through the delivery pipe to prevent the shell of the hollow box from being concave.

[0012] Further, the specific construction method of pouring the concrete further comprises: when the concrete is poured in hot weather, a nozzle connected with the delivery pipe is arranged in the hollow box, cold water is supplied to the delivery pipe to spray cooling water mist in the hollow box.

[0013] Further, the specific construction method of pouring the concrete further comprises: when the concrete is poured in cold weather, hot water or curing steam is injected into the hollow box through the delivery pipe.

[0014] Further, the four sides of the hollow box are concave and provided with a plurality of horizontally extending heat dissipation grooves.

[0015] Compared with the prior art, the present application has the following beneficial effects: The high-speed railway station large-span hollow floor construction method of the present application places the hollow box on the rectangular square tube, presses the top of the box through the anti-floating support, forms the hollow structure to reduce the self-weight and resist the concrete buoyancy; The liquid is injected before pouring to balance the pressure inside and outside the box to prevent the box from collapsing; the cold / heat medium is injected through the delivery pipe to adjust the temperature, optimize the concrete hardening environment, and the concrete temperature difference is less than or equal to 10 DEG C in high temperature environment, and the strength development rate is increased by 20% in low temperature environment. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] Fig. 1 is a structural schematic diagram of the construction method of the high-speed railway station large-span hollow floor of the present application; Fig. 2 is an enlarged structural schematic diagram of the anti-floating support in the present application; Fig. 3 is an enlarged structural schematic diagram of the hollow box in the present application.

[0018] Explanation of reference signs: 1, formwork support; 2, formwork; 3, rib beam; 4, first steel bar; 5, bottom plate; 6, second steel bar; 7, iron wire; 8, rectangular square tube; 9, hollow box; 10, panel; 11, third steel bar; 12, anti-floating support; 16, pressing plate; 17, vertical rod; 18, inclined strut; 19, conveying pipe; 20, discharge pipe; 21, heat dissipation groove; 22, sleeve; 23, spring. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0020] The embodiments of the present application will be described below according to the overall structure of the present application.

[0021] Referring to Figs. 1-3 , the present embodiment provides a construction method of a high-speed railway station large-span hollow floor, and the specific construction method comprises: S1, erecting a formwork support 1 and laying a formwork 2; S2, binding first steel bars 4 constituting a rib beam 3 and second steel bars 6 constituting a bottom plate 5 on the formwork 2; S3, binding the first steel bars 4 of the rib beam 3 and the keel of the formwork 2 with iron wires 7, and binding a rectangular square tube 8 above the second steel bars 6 of the bottom plate 5; S4, placing a hollow box 9 on the rectangular square tube 8, binding third steel bars 11 constituting a panel 10 of the hollow floor, and then placing an anti-floating support 12 between the third steel bars 11 of the panel 10 and the top surface of the hollow box 9. S5, pouring hollow floor concrete, the concrete pouring is carried out in two stages, the pouring height of the first stage is 100-150 mm, the second stage is completed before initial setting, and the interval between the pouring of the second stage and the first stage is 80-100 minutes.

[0022] In the construction method of the application, when the formwork support 1 is erected and the formwork 2 is laid, a support system is built by steel structure or aluminum alloy support, and a flat formwork is laid as a concrete forming base; a stable construction platform is provided to ensure the accuracy of the floor geometry; and the flatness of the formwork is ≤3mm / 2m to avoid concrete leakage or deformation during pouring; When the steel bars of the ribbed beam 3 and the bottom plate 5 are tied, the first steel bar 4 and the second steel bar 6 are tied into a ribbed beam 3 and a bottom plate 5 net structure respectively to form a force skeleton of the floor to bear bending moment and shear force; the steel bar spacing is ≤150mm to ensure uniform stress of the concrete and prevent cracking; When the steel bars are fixed and the rectangular square tube 8 is installed, the first steel bar 4 is fixed with the keel of the formwork 2 by wire 7, and the rectangular square tube 8 is tied in the well grid to prevent the steel bar from shifting, provide a support platform for the hollow box 9, and the square tube 40mm×60mm disperses the load of the box to reduce the local deformation of the formwork; When the hollow box 9 is positioned and the anti-floating support 12 is installed, the hollow box 9 is placed on the rectangular square tube 8, and the box top is pressed by the anti-floating support 12 to form a hollow structure to reduce the self-weight and resist the concrete buoyancy; 8 supports are arranged on each box, and the upward floating amount is <1mm; the hollow box 9 is a polyethylene structure, and the box wall of the hollow box 9 is relatively thick, so that the hollow box 9 is not easy to deform and is not easy to have middle depression; When pouring is carried out in two stages, the first stage pours thin layer concrete 100-150mm, and the second stage is completed before initial setting, which can reduce the instantaneous load of the formwork, avoid cold joint formation, improve the integrity of the floor, and reduce the cracking rate by 60%.

[0023] Specifically, the specific construction method of fixing the first steel bar 4 and setting the rectangular square tube 8 in the above step S3 includes: after the first steel bar 4 of the ribbed beam 3 is tied, the first steel bar 4 is fixed with the keel of the lower formwork 2 by using 14# wire 7; four square tubes are arranged in the well grid surrounded by the ribbed beams 3 arranged longitudinally and transversely to form the rectangular square tube 8 for supporting the hollow box 9, and the four square tubes are fixed with the second steel bar 6 on the formwork 2 by wire 7.

[0024] Specifically, the first steel bars 4 of the ribbed beam 3 are tied with the second steel bars 6 of the bottom plate 5 with iron wires 7, and the second steel bars 6 of the bottom plate 5 are tied with the bottom formwork 2 keels below with iron wires 7. The tying with iron wires 7 can be used to prevent the ribbed beam 3 from floating up, and the second steel bars 6 of the bottom plate 5 and the third steel bars 11 of the face plate 10 are tied with the ribbed beam 3 with iron wires for each small span, and the second steel bars 6 of the bottom plate 5 are tied with the formwork support frame 1 below the bottom plate 5, so as to effectively prevent the hollow box from floating up and drive the ribbed beam 3 and the bottom plate steel bars to float up.

[0025] Specifically, in the step S4, the specific construction method of placing the anti-floating support 12 includes: eight anti-floating supports 12 are placed above each hollow box 9, and the top of the anti-floating support 12 is fixedly connected with the third steel bars 11 of the face plate 10.

[0026] Specifically, the anti-floating support 12 includes a pressing plate 16, a vertical rod 17 and an inclined strut 18, the vertical rod 17 is vertically arranged on the pressing plate 16, the bottom of the inclined strut 18 is provided with a sleeve 22 which is slidably connected with the vertical rod 17, the inclined strut 18 can be adjusted in up-down direction and rotated in left-right direction, and after the inclined strut 18 is abutted with the third steel bars 11 of the face plate 10, the sleeve 22 is fixed with the vertical rod 17 through a screw, and a spring 23 is arranged below the sleeve 22 and is sleeved on the vertical rod 17 to upwardly push the sleeve 22. The inclined strut 18 is self-adaptively adjusted in pressure through the sleeve 22 and the spring 23, is welded with the steel bars 11 after being locked, dynamically balances the floating force during pouring, and avoids the damage of the box caused by rigid fixation; the spring pre-tightening force is adjustable, and is suitable for different box sizes, and the pressure deviation is less than or equal to 5%.

[0027] Specifically, in the step S5, the specific construction method of pouring concrete includes: before the first stage of pouring concrete, a delivery pipe 19 and a discharge pipe 20 are connected with the bottom of the hollow box 9, liquid is injected into the hollow box 9, and the liquid height in the box is 30-50 mm; after the first stage of pouring concrete is completed, the liquid in the hollow box 9 is gradually discharged through the discharge pipe 20 before the second stage of pouring concrete. In the initial pouring stage of concrete, the overall weight of the hollow box 9 is increased by injecting a small amount of liquid into the hollow box 9, so as to further prevent the box from floating up, and the liquid in the hollow box 9 can be released in the second stage of pouring concrete, and the second stage of pouring concrete only contacts with the side wall of the hollow box 9 and does not directly exert upward floating force on the hollow box 8.

[0028] Specifically, the concrete pouring specific construction method further comprises: when the second stage of concrete pouring is performed, gradually injecting compressed air into the hollow box 9 through the delivery pipe 19 to prevent the outer shell of the hollow box 9 from being concave, and the gradually injected compressed air can increase the air pressure inside the hollow box 9, and the internal gas can support the inner wall of the box to prevent the outer shell of the box from being concave due to extrusion.

[0029] Specifically, the concrete pouring specific construction method further comprises: when the concrete pouring is performed in hot weather, a nozzle connected with the delivery pipe 19 is arranged in the hollow box 9, cold water is supplied to the delivery pipe 19 to spray cold water mist in the hollow box 9, temperature probes are arranged on the inner wall of the hollow box 9 to monitor the temperature of the inner cavity of the hollow box 9, and a wiring pipe is arranged in the hollow box 9 to pass through the bottom end shell of the hollow box 9 and the bottom plate 5, and is used to bundle the signal lines of the temperature probes and extend to the outside of the hollow box 9 from the wiring pipe to be connected with a monitoring host. The monitoring host can judge according to the monitoring temperature of each temperature probe, and when it is monitored that the temperature of the inner cavity of the hollow box 9 is too high, it is proved that the temperature of the concrete outside the hollow box 9 is too high. The monitoring host controls the water pump to draw cold water into the delivery pipe 19, and sprays cold water and water mist into the hollow box 9 through the delivery pipe 19 and the nozzle to cool the inner cavity and the outer shell of the hollow box 9. The heat of the concrete can be quickly transferred from the outer shell of the hollow box 9 to the cold water or water mist in the hollow box 9, so as to quickly cool and heat the concrete.

[0030] Specifically, the concrete pouring specific construction method further comprises: when the concrete pouring is performed in cold weather, hot water or curing steam is injected into the hollow box 9 through the delivery pipe 19. When it is monitored that the temperature of the inner cavity of the hollow box 9 is too low, it is proved that the temperature of the concrete outside the hollow box 9 is too low. The monitoring host controls the water pump to draw hot water into the delivery pipe 19, and sprays hot water and water mist into the hollow box 9 through the delivery pipe 19 and the nozzle to heat the inner cavity of the hollow box 9, or inputs high-temperature steam into the hollow box 9 to heat the inner cavity and the outer shell of the hollow box 9. Since the outer shell of the hollow box 9 has a large surface area, the outer shell of the hollow box 9 can transfer heat to the outside concrete to heat the concrete.

[0031] The cold / heat medium is injected through the delivery pipe 19 to adjust the temperature and optimize the concrete hardening environment. In a high-temperature environment, the temperature difference of the concrete is ≤10℃, and in a low-temperature environment, the strength development rate is increased by 20%. The construction can cope with the harsh environment of excessively low winter temperature in high-latitude and high-altitude areas to ensure the quality of the floor.

[0032] Further, the four sides of the hollow box 9 are concave and provided with a plurality of horizontally extending heat dissipation grooves 21. The heat dissipation grooves 21 are arranged on the surface of the hollow box 9 to form a groove structure that engages with the concrete, increase the contact area, enhance the mechanical embedding effect of the concrete and the box, and increase the interface shear strength by 15%-20%, thereby avoiding debonding.

[0033] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as falling within the scope of the present disclosure.

[0034] The above embodiments only express one or several embodiments of the present application, and the description is specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A construction method of a high-speed railway station large-span hollow floor, characterized in that, The specific construction method comprises: S1, erecting a formwork support (1) and laying a formwork (2); S2, binding first reinforcing bars (4) constituting rib beams (3) and second reinforcing bars (6) constituting bottom plates (5) on the formwork (2); S3, binding the first reinforcing bars (4) of the rib beams (3) and keels of the formwork (2) firmly by iron wires (7), and binding rectangular square tubes (8) above the second reinforcing bars (6) of the bottom plates (5); S4, placing hollow box bodies (9) on the rectangular square tubes (8), and binding third reinforcing bars (11) constituting face plates (10) of hollow floor slabs, and then placing anti-floating supports (12) between the third reinforcing bars (11) of the face plates (10) and top surfaces of the hollow box bodies (9); S5, pouring hollow floor slab concrete, and the concrete pouring is carried out in two stages, the pouring height of the first stage is 100-150 mm, the second stage is completed before initial setting, and the interval between the pouring of the second stage and the pouring of the first stage is 80-100 minutes.

2. The construction method of a high-speed railway station large-span hollow floor according to claim 1, characterized in that, In the step S3, the specific construction method for fixing the first reinforcing bars (4) and setting the rectangular square tubes (8) comprises the following steps: after the binding of the first reinforcing bars (4) of the rib beams (3) is completed, the first reinforcing bars (4) and the keels of the lower formwork (2) are fixed by using 14# iron wires (7); four square tubes are arranged in the well formed by the rib beams (3) arranged in the longitudinal and transverse directions to form the rectangular square tubes (8) for supporting the hollow box bodies (9), and the four square tubes are fixed with the second reinforcing bars (6) on the formwork (2) by iron wires (7).

3. The construction method of a high-speed railway station large-span hollow floor according to claim 2, characterized in that, The first reinforcing bars (4) of the rib beams (3) and the second reinforcing bars (6) of the bottom plates (5) are firmly bound by iron wires (7), and then the second reinforcing bars (6) of the bottom plates (5) and the keels of the lower formwork (2) are bound and fixed.

4. The construction method of a high-speed railway station large-span hollow floor according to claim 3, characterized in that, In the step S4, the specific construction method for placing the anti-floating supports (12) comprises the following steps: eight anti-floating supports (12) are placed above each hollow box body (9), and the top of each anti-floating support (12) is fixedly connected with the third reinforcing bars (11) of the face plate (10).

5. The construction method of a high-speed railway station large-span hollow floor according to claim 4, characterized in that, The anti-floating support (12) comprises a pressing plate (16), a vertical rod (17) and an inclined supporting rod (18), the vertical rod (17) is vertically arranged on the pressing plate (16), the bottom of the inclined supporting rod (18) is provided with a sleeve in sliding connection with the vertical rod (17), and the inclined supporting rod (18) can be adjusted up and down and rotated left and right, and after the inclined supporting rod (18) abuts against the third reinforcing bars (11) of the face plate (10), the sleeve and the vertical rod (17) are fixed.

6. The construction method of a long-span hollow floor of a high-speed railway station according to any one of claims 1-5, characterized in that, In the step S5, the specific construction method for pouring concrete comprises the following steps: before the first stage of concrete pouring starts, a delivery pipe (19) and a discharge pipe (20) are connected with the bottom of the hollow box body (9), a liquid is injected into the hollow box body (9), and the liquid height in the box is 30-50 mm; after the first stage of concrete pouring is completed, the liquid in the hollow box body (9) is gradually discharged through the discharge pipe (20) before the second stage of concrete pouring is carried out.

7. The construction method of a high-speed railway station large-span hollow floor according to claim 6, characterized in that, The specific construction method of the concrete pouring further comprises: when the second stage of the concrete pouring is performed, compressed air is injected into the hollow box (9) through the delivery pipe (19) to prevent the outer shell of the hollow box (9) from being concave.

8. The construction method of a high-speed railway station large-span hollow floor according to claim 7, characterized in that, The specific construction method of the concrete pouring further comprises: when the concrete pouring is performed in hot weather, a nozzle connected with the delivery pipe (19) is arranged in the hollow box (9), and cold water is supplied to the delivery pipe (19) to spray cooling water mist in the hollow box (9).

9. The construction method of a high-speed railway station large-span hollow floor according to claim 8, characterized in that, The specific construction method of the concrete pouring further comprises: when the concrete pouring is performed in cold weather, hot water or curing steam is injected into the hollow box (9) through the delivery pipe (19).

10. The construction method of a high-speed railway station large-span hollow floor according to claim 9, characterized in that, The four side surfaces of the hollow box (9) are concave and provided with a plurality of horizontally-extended heat dissipation grooves (21).

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