Construction method of large thickness concrete raft

Abstract

The present application relates to a kind of construction methods of large thickness concrete raft, including steps: raft reinforcement binding, raft formwork construction, concrete pouring, concrete curing.The beneficial effects of the present application are: steel pipe is worn with anchor cable, and mortar is injected, so that steel pipe forms post-tensioned prestressed connected mortar steel pipe, the strength of raft steel pipe support system is improved;The steel formwork of catch basin is supported and fixed using adjustable jacking and telescopic rod, the rapid positioning of steel formwork is realized, the construction efficiency is accelerated, and the catch basin formwork construction quality is guaranteed;Automatic opening and closing equipment is used, and automatic opening and closing of reverse chute concrete pouring is realized;Integral layered pouring vibrating frame is used, the vibrating construction platform is increased, and the concrete vibrating quality is improved.

Description

Technical Field

[0001] This invention relates to a construction method for thick concrete raft slabs, which is mainly applicable to the construction of thick concrete raft slabs. Background Technology

[0002] With the rapid development of my country's economy, the demand for infrastructure construction is increasing. Mass concrete, due to its advantages such as abundant raw materials, convenient construction, and strong load-bearing capacity, has been widely used in transportation engineering, municipal engineering, water conservancy engineering, and building construction. The scale of these projects is expanding, and their structural forms are becoming increasingly complex. my country's GB 50496-2018 "Standard for Construction of Mass Concrete" defines mass concrete as concrete with a minimum geometric dimension of 1 meter.

[0003] The following construction problems may be encountered during the construction of large-volume raft concrete foundations:

[0004] 1) Traditional rebar positioning frames tend to deviate due to their low strength;

[0005] 2) The reverse chute requires manual opening and closing, which increases the safety risks to personnel;

[0006] 3) When vibrating at multiple points in an inclined layer, the working surface of the vibration is small, which can easily cause some concrete to be not compacted.

[0007] In view of this, in response to a series of problems that arise during the construction of thick concrete raft slabs, there is an urgent need to invent a simple and effective construction system for thick concrete raft slabs to improve the safety of concrete chute pouring construction. In particular, for the construction of thick concrete raft slabs, it has the advantages of significantly saving construction costs, accelerating construction progress and improving construction safety performance. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a thick concrete raft slab and its construction method.

[0009] The construction method for this type of thick concrete raft slab includes the following steps:

[0010] S1. Raft foundation reinforcement binding: After the foundation layer passes inspection, a raft foundation steel pipe support system is erected using steel pipes and main reinforcement fixing plates, and post-tensioning prestress is applied to the steel pipes through anchor cables; the main reinforcement of the raft foundation is bound on the main reinforcement fixing plates, and the reinforcement construction of the entire raft foundation is completed according to the design requirements; an intelligent temperature measurement system is embedded in the steel pipe support system.

[0011] S2. Raft formwork construction: Traditional wooden formwork is used for the side formwork construction of the raft slab, and steel formwork is used for the formwork construction of the sump pit. The steel formwork is fixed to the inside of the shear wall by adjustable top supports and telescopic rods.

[0012] S3. Concrete pouring: Erect scaffolding and install the main chute and the reverse chute to form an automatic opening and closing device for the reverse chute. Then, erect an overall layered pouring vibrating frame. Concrete is discharged from the chute discharge port at the top of the main chute. The opening and closing of the reverse chute is controlled by the baffle in the automatic opening and closing device of the reverse chute. The concrete is vibrated and compacted by the overall layered pouring vibrating frame.

[0013] S4. Concrete curing: The internal temperature of the concrete at the steel pipe support system is monitored by an intelligent temperature measurement embedded system. If the temperature difference exceeds the set value, the internal temperature of the concrete is cooled down.

[0014] Preferably, in step S1: the raft slab steel pipe support system includes a main reinforcement fixing plate and steel pipes. The steel pipes are erected to form a steel pipe frame. Anchor cables are inserted into the steel pipes. Upright pads are set at the bottom of the steel pipe frame. The upright pads are fixed to the pad layer by bolts. Mortar is injected into the steel pipes. Pads are set outside the anchor cables at the ends of the steel pipes. The main reinforcement fixing plate is welded on the vertically set steel pipes. Prestress is applied to the steel pipes by tensioning the anchor cables.

[0015] As a preferred embodiment, in step S1: the intelligent temperature measurement embedding system includes a temperature sensor, which transmits signals through a signal line, and the temperature sensor is fixed to a steel pipe support with a wire, with insulating tape wrapped around the outer side of one end of the wire connected to the temperature sensor.

[0016] As a preferred embodiment, in step S2: the sump pit is supported by steel formwork, the steel formwork is temporarily fixed by diagonal bracing, adjustable top supports are installed on the steel formwork, and telescopic rods are installed in the adjustable top supports on both sides. Rotating the handle causes the telescopic rods to tighten the steel formwork on both sides, and the shear wall is attached to the inside of the steel formwork.

[0017] Preferably, in step S3: scaffolding is set up outside the enclosure structure, and then the main chute and the reverse chute are installed on the scaffolding. A chute is set at the bottom of the main chute and the reverse chute, a chute opening is set between the main chute and the reverse chute, and a baffle is set above the chute opening. A movable rod is welded on the baffle, and a small rotating machine is fixed on the outside of the main chute. The movable rod is connected to the small rotating machine.

[0018] As a preferred embodiment, in step S3: the overall layered pouring vibratory frame includes vertical rods and steel sections, a panel is laid on the vertical rods, several diagonal braces are set at the cantilever end of the panel for stability, and three vibratory rods are set on the panel.

[0019] As a preferred embodiment, in step S3: the main chute is composed of a wooden template fitted over the outer side of the sheet metal.

[0020] Preferably, in step S4: the interior of the concrete is cooled by a water circulation system; the covering material used for curing the concrete surface includes one or more of burlap sacks, straw bags, and plastic sheeting.

[0021] A thick concrete raft slab: obtained according to any of the above methods.

[0022] The beneficial effects of this invention are:

[0023] 1) The steel pipes in the raft foundation steel pipe support system are threaded with anchor cables and injected with mortar, so that the steel pipes form post-tensioned prestressed integrated mortar steel pipes, which improves the strength of the raft foundation steel pipe support system.

[0024] 2) The steel formwork of the sump pit is fixed by adjustable top supports and telescopic rods, which realizes the rapid positioning of the steel formwork, speeds up the construction efficiency, and ensures the construction quality of the sump pit formwork.

[0025] 3) The reverse chute node adopts an automatic opening and closing device, which realizes the automatic opening and closing of the reverse chute concrete pouring and further expands the concrete pouring range.

[0026] 4) The concrete vibration adopts an integral layered pouring vibration frame, which increases the vibration construction platform and improves the quality of concrete vibration. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the steel pipe support system of the present invention;

[0028] Figure 2 This is a schematic diagram of the temperature sensor setup of the present invention;

[0029] Figure 3 This is a schematic diagram of the water collection pit template of the present invention;

[0030] Figure 4 This is a schematic diagram of the telescopic rod connection of the present invention;

[0031] Figure 5 This is a schematic diagram of the chute casting construction of the present invention;

[0032] Figure 6 This is a cross-sectional view of the main chute of the present invention;

[0033] Figure 7 This is a schematic diagram of the reverse chute node of the present invention;

[0034] Figure 8 This is a cross-sectional view of the movable baffle of the present invention;

[0035] Figure 9 This is a schematic diagram of the integral layered casting vibratory frame of the present invention.

[0036] The components are as follows: 1. Upright pole pad, 2. Bolt, 3. Washer, 4. Main reinforcement fixing plate, 5. Mortar, 6. Steel pipe, 7. Anchor cable, 8. Signal line, 9. Temperature sensor, 10. Iron wire, 11. Insulating tape, 12. Diagonal brace, 13. Shear wall, 14. Adjustable top support, 15. Steel formwork, 16. Sump, 17. Subbase, 18. Enclosure structure, 19. Chute discharge port, 20. Main chute, 21. Reverse chute, 22. Stringer, 23. Raft foundation, 24. Sheet metal, 25. Wooden formwork, 26. Baffle, 27. Chute opening, 28. Vibrator, 29. Panel, 30. Vertical pole, 31. Structural steel, 32. Handle, 33. Telescopic pole, 34. Small rotating machine, 35. Movable pole, 36. Scaffolding, 37. Concrete. Detailed Implementation

[0037] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0038] Example 1

[0039] As one example, such as Figures 1 to 9 As shown, the construction method for a thick concrete raft slab includes the following steps:

[0040] S1. Raft foundation reinforcement binding: After the foundation 17 passes inspection, a raft foundation steel pipe support system is erected using steel pipes 6 and main reinforcement fixing plates 4, and post-tensioning prestress is applied to the steel pipes 6 through anchor cables 7; the main reinforcement of the raft foundation 23 is bound on the main reinforcement fixing plates 4, and the reinforcement construction of the entire raft foundation 23 is completed according to the design requirements; the raft foundation steel pipe support system includes main reinforcement fixing plates 4 and steel pipes 6. The steel pipes 6 are erected to form a steel pipe frame, and anchor cables 7 are inserted into the steel pipes 6. Upright pads 1 are set at the bottom of the steel pipe frame, and the upright pads 1 are fixed to the foundation 17 by bolts 2. Mortar 5 is injected into the steel pipes 6, and pads 3 are set outside the anchor cables 7 at the ends of the steel pipes 6. The main reinforcement fixing plates 4 are welded on the vertically set steel pipes 6, and prestress is applied to the steel pipes 6 through tensioning anchor cables 7. An intelligent temperature measurement system is embedded in the steel pipe support system. The intelligent temperature measurement system includes a temperature sensor 9, which transmits signals through a signal line 8. The temperature sensor 9 is fixed to the steel pipe support with a wire 10, and an insulating tape 11 is wrapped around the outside of one end of the wire 10 connected to the temperature sensor 9.

[0041] S2. Raft formwork construction: Traditional wooden formwork is used for raft side formwork construction. The sump pit 16 is supported by steel formwork 15. The steel formwork 15 is temporarily fixed with diagonal bracing 12. Adjustable top supports 14 are installed on the steel formwork 15. Telescopic rods 33 are installed in the adjustable top supports 14 on both sides. Rotating the handle 32 makes the telescopic rods 33 tighten the steel formwork 15 on both sides. Shear wall 13 is attached to the inside of the steel formwork 15.

[0042] S3, Concrete pouring: Scaffolding 36 is set up outside the retaining structure 18, and then the main chute 20 and the reverse chute 21 are installed on the scaffolding 36. The main chute 20 is composed of wooden template 25 wrapped around the outside of iron sheet 24. A tremie pipe 22 is set at the bottom of the main chute 20 and the reverse chute 21. A chute opening 27 is set between the main chute 20 and the reverse chute 21. A baffle 26 is set above the chute opening 27. A movable rod 35 is welded on the baffle 26. A small rotating machine 34 is fixed outside the main chute 20. The movable rod 35 is connected to the small rotating machine 34 to form an automatic opening and closing device for the reverse chute.

[0043] Then, an overall layered pouring and vibration frame is erected. The overall layered pouring and vibration frame includes vertical rods 30 and steel sections 31. Panels 29 are laid on the vertical rods 30. Several diagonal braces 12 are set at the cantilever ends of the panels 29 for stability. Three vibrators 28 are set on the panels, realizing multi-point rapid vibration construction.

[0044] Concrete 37 is discharged from the chute discharge port 19 at the top of the main chute 20. The opening and closing of the reverse chute 21 is controlled by the baffle 26 in the automatic opening and closing device of the reverse chute. The concrete 37 is vibrated and compacted by the overall layered pouring vibrating frame.

[0045] S4. Concrete curing: The internal temperature of the concrete at the steel pipe support system is monitored by an intelligent temperature measurement embedded system. If the temperature difference is too large, specifically exceeding the set value, the concrete is cooled by a water circulation system. The covering materials used for concrete surface curing include one or more of burlap sacks, straw bags, and plastic sheeting.

[0046] Example 2

[0047] As another embodiment, according to the construction method of the thick concrete raft slab given in Embodiment 1, the construction device for the thick concrete raft slab includes a raft slab steel pipe support system, an intelligent temperature measurement embedding system, a sump formwork system, an automatic opening and closing device for the reverse chute, and an integral layered pouring and vibrating frame.

[0048] like Figure 1As shown, the raft foundation steel pipe support system includes main reinforcement fixing plates 4 and steel pipes 6. The steel pipes 6 include horizontal steel pipes and vertical steel pipes. The bottom of the vertical steel pipes is welded to the connection of the upright pads 1, and the upright pads 1 are fixed to the pad layer 17 by bolts 2. Anchor cables 7 pass through the steel pipes 6, with both ends of the anchor cables 7 extending outside the ends of the steel pipes 6. Mortar 5 is also provided inside the steel pipes 6, and the ends of the steel pipes 6 are sealed by pads 3. Several layers of main reinforcement fixing plates 4 are provided on the vertical steel pipes.

[0049] like Figure 2 As shown, the intelligent temperature measurement system includes a temperature sensor 9, which is connected to a signal line 8. The temperature sensor 9 is connected to the raft steel pipe support system via an iron wire 10. One end of the iron wire 10 is connected to the steel pipe 6 of the raft steel pipe support system, and the other end is connected to the temperature sensor 9. Insulating tape 11 is provided between the iron wire 10 and the temperature sensor 9.

[0050] like Figure 3 and Figure 4 As shown, the sump formwork system includes steel formwork 15 and telescopic rods 33. The sump 16 is supported by steel formwork 15. The steel formwork 15 is temporarily fixed by diagonal bracing 12. The steel formwork 15 is attached to the inner side of the shear wall 13. Telescopic rods 33 are provided between the steel formwork 15. The two ends of the telescopic rods 33 are connected to the steel formwork 15 through adjustable top supports 14. Both ends of the telescopic rods 33 are provided with handles 32.

[0051] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the automatic opening and closing device for the reverse chute includes scaffolding 36, a main chute 20, and a reverse chute 21. The main chute 20 and the reverse chute 21 are mounted above the raft steel pipe support system via scaffolding 36, which is located outside the retaining structure 18. The main chute 20 includes wooden formwork 25 and sheet metal 24, with the sheet metal 24 located outside the wooden formwork 25. A chute 22 is provided at the bottom of the main chute 20 and the reverse chute 21, and a chute discharge port 19 is provided at the top of the main chute 20. A small rotating machine 34 is provided on the outside of the main chute 20, and a movable rod 35 is connected to the small rotating machine 34. The main chute 20 and the reverse chute 21 are connected via a chute opening 27, and the main chute 20 is connected to a baffle 26 via the movable rod 35. The baffle 26 is slidably connected to the chute opening 27.

[0052] like Figure 9 As shown, the integral layered pouring vibratory frame is set above the raft slab steel pipe support system. The integral layered pouring vibratory frame includes a panel 29 and vibratory rods 28. The bottom of the panel 29 is connected to a vertical rod 30, which is welded to the steel section 31. The bottom of the panel 29 is connected to a diagonal brace 12 for stability. Three vibratory rods 28 are provided on the panel 29.

Claims

1. A construction method for a thick concrete raft slab, characterized in that, Includes the following steps: S1. Raft foundation reinforcement binding: After the foundation (17) passes inspection, a raft foundation steel pipe support system is erected using steel pipes (6) and main reinforcement fixing plates (4), and post-tensioning prestress is applied to the steel pipes (6) through anchor cables (7); the main reinforcement of the raft foundation (23) is bound on the main reinforcement fixing plates (4), and the reinforcement construction of the entire raft foundation (23) is completed according to the design requirements. An intelligent temperature measurement system is embedded in the steel pipe support system; the raft foundation steel pipe support system includes the main reinforcement fixing plates (4) and steel pipes (6). The steel pipes (6) are erected to form a steel pipe frame. Anchor cables (7) are inserted into the steel pipes (6), and upright pads are set at the bottom of the steel pipe frame. The plate (1) and the upright pad (1) are fixed on the pad layer (17) by bolts (2). Mortar (5) is injected into the steel pipe (6). The pad (3) is set outside the anchor cable (7) at the end of the steel pipe (6). The main reinforcement fixing plate (4) is welded on the vertically set steel pipe (6). The steel pipe (6) is prestressed by tensioning the anchor cable (7). The intelligent temperature measurement buried system includes a temperature sensor (9). The temperature sensor (9) transmits signals through the signal line (8). The temperature sensor (9) is fixed on the steel pipe support by iron wire (10). The iron wire (10) is connected to the outside of the temperature sensor (9) by wrapping insulating tape (11). S2. Raft formwork construction: Traditional wooden formwork is used for raft side formwork construction, and steel formwork (15) is used for sump pit (16) formwork construction. The steel formwork (15) is fixed to the inside of the shear wall (13) by adjustable top support (14) and telescopic rod (33). S3, Concrete Pouring: Erect scaffolding (36) and install the main chute (20) and the reverse chute (21) to form an automatic opening and closing device for the reverse chute, and then erect an integral layered pouring vibrating frame; the concrete (37) is discharged from the chute discharge port (19) at the top of the main chute (20), and the opening and closing of the reverse chute (21) is controlled by the baffle (26) in the automatic opening and closing device for the reverse chute, and the vibration construction of the concrete (37) is carried out by the integral layered pouring vibrating frame; scaffolding (36) is set up outside the retaining structure (18), and then the main chute (20) and the reverse chute (21) are installed on the scaffolding (36), and the main chute (20) and the reverse chute (21) are poured in the main chute (20). A chute (22) is installed at the bottom of the main chute (20) and the reverse chute (21). A chute opening (27) is set between the main chute (20) and the reverse chute (21). A baffle (26) is set above the chute opening (27). A movable rod (35) is welded on the baffle (26). A small rotating machine (34) is fixed on the outside of the main chute (20). The movable rod (35) is connected to the small rotating machine (34). The overall layered pouring vibratory frame includes a vertical rod (30) and a steel section (31). A panel (29) is laid on the vertical rod (30). Several diagonal braces (12) are set at the cantilever end of the panel (29) for stability. Three vibratory rods (28) are set on the panel. S4. Concrete curing: The internal temperature of the concrete at the steel pipe support system is monitored by an intelligent temperature measurement embedded system. If the temperature difference exceeds the set value, the internal temperature of the concrete is cooled down.

2. The construction method for a thick concrete raft slab according to claim 1, characterized in that, In step S2: the sump (16) is supported by steel formwork (15), the steel formwork (15) is temporarily fixed by diagonal bracing (12), adjustable top support (14) is set on the steel formwork (15), and telescopic rod (33) is set in the adjustable top support (14) on both sides. Rotate the handle (32) to make the telescopic rod (33) tighten the steel formwork (15) on both sides, and the shear wall (13) is attached inside the steel formwork (15).

3. The construction method for a thick concrete raft slab according to claim 1, characterized in that, In step S3: the main chute (20) is composed of a wooden template (25) fitted onto the outside of the sheet metal (24).

4. The construction method for a thick concrete raft slab according to claim 1, characterized in that, In step S4: the interior of the concrete is cooled by a water circulation system; the covering material used for curing the concrete surface includes one or more of burlap sacks, straw bags, and plastic sheeting.

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