Sliding Concrete Raft Slab Winter Insulation and Curing Shed and Construction Method

Abstract

This invention discloses a sliding concrete raft foundation winter insulation and curing scaffold and its construction method, belonging to the field of winter construction technology. Addressing the problems of raft foundation construction in cold northern regions being susceptible to freezing, requiring winter rest periods, and having inefficient and non-reusable insulation measures, this invention employs a combined structure of a sliding rail, sliding components, and scaffold, including a channel steel rail, round steel clamps, threaded steel sliding components, steel wire supports, and a plastic insulation layer. The scaffold can slide synchronously along the rail as the concrete pouring progresses, with internal supports connecting to and reinforcing the raft foundation with pre-reserved steel bars. This invention is lightweight, easy to install, and reusable; at low temperatures, it utilizes the heat of concrete hydration for insulation, eliminating the need for additional heating, enabling continuous winter construction without winter rest periods. It is suitable for winter insulation and curing of various types of concrete raft foundations in northern regions.

Description

Technical Field

[0001] This invention relates to the field of winter construction technology in building engineering, and in particular to a sliding concrete raft slab winter insulation and curing shed and its construction method. Background Technology

[0002] Winters in northern my country are cold, with temperatures often below 0°C. Concrete raft foundations are susceptible to frost damage during construction, leading to reduced strength, cracking, and other quality problems. Traditional winter insulation for raft foundations often involves fixed installation of cotton quilt sheds, rock wool sheds, or heated sheds, which have the following drawbacks: 1. The fixed frame must be customized according to the size of the raft slab and cannot be slipped. If the covering is delayed after pouring, it will be susceptible to freezing. 2. It is not reusable, is for single use only, and is costly and wasteful. 3. It requires coal / electric heating, resulting in high energy consumption and poor environmental performance; 4. The erection and dismantling process is time-consuming, affecting construction efficiency. Summary of the Invention

[0003] This invention aims to overcome the shortcomings of existing technologies and provide a sliding concrete raft foundation winter insulation and curing shed, enabling continuous construction of raft foundations in northern winters without the need for winter rest; the shed can slide and cover synchronously and can be rotated; at low temperatures, insulation can be achieved solely through the heat of hydration, without the need for additional heating.

[0004] To achieve the above objectives, this invention discloses a sliding concrete raft foundation winter insulation and curing shed, the core structure of which mainly includes a track unit, a sliding unit, and a shed unit. The track unit is laid on both sides of the raft foundation and has a limiting part inside; the two ends of the sliding unit are slidably connected to the track units on both sides and are limited by the limiting part to prevent them from detaching; the shed unit is erected on the sliding unit; the inner side of the shed unit is provided with several vertical support members, the lower ends of which are used for fixed connection with the wall column reinforcement reserved in the raft foundation.

[0005] Track unit: The track is made of No. 5 channel steel and is laid flat on the edge pad layer of the raft or on the edge reserved steel bars; A12 round steel clips are welded to the upper ends of both sides of the inner wall of the track for limiting the sliding parts; expansion bolts are installed at intervals on the lower side of the track as fixing parts to fix the track to the base layer.

[0006] Sliding unit: The sliding component is made of C20 threaded steel and is horizontally embedded in the track, allowing it to slide freely along the longitudinal direction of the track; the two ends of the sliding component are limited by clamps to prevent it from falling off.

[0007] Frame unit: The support components are made of Φ60 thick steel wire, which is welded to the sliding components at equal intervals to form an arched or sloping support frame; the insulation layer is made of thick plastic cloth, which is covered on the outside of the support components and tied with wire; vertical support components are set at equal intervals on the inside of the frame, with the upper end connected to the frame and the lower end tied or welded to the reserved wall column reinforcement of the raft slab through straight threaded steel bars to prevent the frame from collapsing.

[0008] To enable those skilled in the art to more broadly understand the present invention, the implementation of the above-mentioned core unit is described as follows: The track unit is used to provide guidance and load-bearing support for the overall movement of the scaffold. It is not limited to a specific type of channel steel, but can also use other steel profiles with internal cavities or groove structures (such as C-shaped steel, H-shaped steel, or special-shaped guide rails). The limiting part is set inside the track unit or at the opening. Its structural form can be a limiting rod, limiting block, or positioning pin that is additionally welded or screwed into the track, or it can be an anti-detachment protrusion formed by integrally bending or flanging the track unit body during molding, as long as it can prevent the sliding unit from detaching from the track unit in a direction perpendicular to the track. The sliding unit is horizontally mounted between the track units on both sides, serving as the moving base and horizontal frame of the scaffold, with its two ends embedded in the track unit. The sliding unit can be made of threaded steel, round steel, steel pipe, square tube, or lightweight profile with a certain bending strength. The scaffolding unit includes a supporting frame and an insulation layer. The supporting frame can be made of thick steel wire, thin steel pipe, or high-strength profiles, processed into various shapes such as arches, slopes, or beams to facilitate drainage and snow sliding. The insulation layer can be made of plastic sheeting, insulating quilts, rock wool felt, flame-retardant canvas, or a combination of these materials, used to enclose the scaffolding and prevent heat loss. The vertical support members (or inner support members) are located on the inner side of the scaffolding unit. Their upper ends are connected to the scaffolding unit's frame or sliding unit, and their lower ends are fixedly connected to existing specific structures on the construction site (such as wall column reinforcement, dowel bars, etc. reserved in the raft foundation) through straight threaded sleeves, binding, overlapping, or welding. This structure, by "borrowing" existing steel reinforcement structures on the construction site, greatly improves the wind load resistance, snow load resistance, and anti-sinking and collapse prevention capabilities of large-span, lightweight sliding scaffolding, representing a collaborative and stable design for specific construction environments.

[0009] Compared with the prior art, the sliding concrete raft foundation winter insulation and curing shed of the present invention has the following positive effects: 1. Sliding synchronous covering: The scaffolding slides along with the concrete pouring progress to cover the newly poured concrete in real time, preventing it from freezing and ensuring the quality of curing; 2. No additional heating required: The curing temperature inside the shed can be maintained above 5°C using the heat of concrete hydration in low-temperature environments, which is energy-saving, environmentally friendly, and reduces costs. 3. Reusable: The all-steel structure is detachable, suitable for different raft sizes, with high reusability and good economy; 4. Lightweight and convenient: Made of common materials, simple to manufacture and install, can be operated manually, without the need for large equipment; 5. Continuous construction: No winter break is required in northern regions, shortening the construction period and improving efficiency. Attached Figure Description

[0010] Figure 1 This is a top view of the overall structure of the sliding concrete raft winter insulation and curing shed frame of the present invention; Figure 2 This is a side sectional view of the sliding concrete raft foundation winter insulation and curing shed frame of the present invention; Figure 3 This is a detailed drawing of the connection node between the track and sliding component of the sliding concrete raft winter insulation and curing shed of the present invention.

[0011] In the diagram: 1-fixed component; 2-sliding unit; 3-track unit; 4-limiting part; 5-insulation layer; 6-support component; 7-inner support component. Detailed Implementation

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the various embodiments and features described herein can be combined with each other.

[0013] Example 1 Please see now Figures 1-3 , Figure 1 Top view: The track unit 3 is arranged longitudinally along both sides of the raft, the sliding unit 2 is horizontally mounted on the track, the support members 6 are arranged in an arch shape, and the insulation layer 5 covers the support members. Figure 2 The side view shows that the track unit 3 is fixed to the pad layer, the sliding unit 2 is embedded in the track, the support 6 arches upward, the insulation layer 5 forms a closed shed, and the lower end of the inner support 7 is connected to the raft slab reinforcement. Figure 3 Detailed drawing of the node: The limiting part 4 on the inner wall of the track unit 3 clamps the sliding unit 2, and the fixing part 1 penetrates the track and is fixed to the base layer.

[0014] The present invention relates to a method for constructing a sliding concrete raft foundation winter insulation and curing shed, comprising the following steps: 1. Track processing: Cut No. 5 channel steel to the length of the raft plate, and weld A12 round steel limiting parts 4 on the upper ends of both sides of the inner wall of the track; 2. Sliding component preparation: Cut C20 threaded steel bars according to the span of the scaffold; 3. Support component welding: Weld Φ60 thick steel wires at 500mm intervals to the sliding unit 2 to form an arched frame; 4. Fixing the insulation layer: Cover the outside of the support 6 with thick plastic sheeting and tie it with wire every 200mm; 5. Accessory preparation: 7. Machining the inner support component; 1. Preparing expansion screw fasteners.

[0015] Example 2 The present invention relates to a method for installing and constructing a sliding concrete raft foundation winter insulation and curing shed, comprising the following steps: 1. Track laying: Lay the processed track unit 3 flat on the raft slab edge pad or edge reserved steel bar, adjust the straightness, and fix it with expansion bolts 1 every 1000mm; if it is laid on the reserved steel bar, weld the fixing parts to the steel bar. 2. Sliding component assembly: Embed the sliding unit 2 into the track unit 3 to ensure free sliding; 3. Sliding and covering of the scaffold: Pour concrete in layers from one side of the raft foundation to the other; when the concrete begins to finish, slowly slide the assembled scaffold from the poured side to the unpoured side to cover the newly poured concrete. 4. Internal reinforcement: As the sliding progresses, vertical support members 7 are installed every 1500mm on the inner side of the scaffold, with the lower end connected and fixed to the reserved wall column steel bars of the raft slab to prevent the scaffold from sinking or collapsing. 5. Maintenance work: After the shed is closed, workers can carry out finishing work, covering with film or insulation cotton, etc. inside; the temperature inside the shed is maintained by the heat of concrete hydration. When the outdoor temperature is extremely low, a heater can be installed inside the shed. 6. Removal and reuse: After the raft slab has reached the required strength, remove the inner support components, insulation layer, support components, sliding components and track in sequence. After cleaning, it can be used for subsequent projects.

[0016] Example 3 In a high-rise residential project in northern my country, the raft foundation measures 40m x 20m, and the winter construction temperature is -5℃ to -5℃. This invention utilizes a sliding concrete raft foundation winter insulation and curing shed: The track is made of No. 5 channel steel, 40m long, and has 4 tracks on both sides; The sliding parts are made of C20 threaded steel, with a span of 20m and a spacing of 1.5m; The support components are made of Φ60 thick steel wire with a spacing of 500mm; The insulation layer is made of 0.5mm thick plastic sheeting.

[0017] The construction results of the sliding concrete raft slab winter insulation and curing shed of this invention are as follows: the shed slides smoothly and is covered in a timely manner; the temperature inside the shed is stable at 8℃-15℃; the concrete strength reaches more than 85% of the design strength after 7 days of curing, with no frost damage or cracking; the shed is intact after dismantling and can be reused.

[0018] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of this invention and are defined by the claims.

Claims

1. A sliding concrete raft foundation winter insulation and curing shed, characterized in that: It includes a track unit (3), a sliding unit (2), and a canopy unit; the track unit (3) is laid on both sides of the raft slab, and a limiting part (4) is provided inside it, and a fixing part (1) is provided at intervals on the lower side of the track unit (3); the two ends of the sliding unit (2) are respectively embedded in the track unit (3) and can slide along its longitudinal direction, and are limited by the limiting part (4) to prevent them from falling out; the canopy unit is erected on the sliding unit (2); the inner side of the canopy unit is provided with several inner support members (7), and the lower end of the inner support member (7) is used to fix and connect with the wall column steel bars reserved in the raft slab.

2. The sliding concrete raft foundation winter insulation and curing shed according to claim 1, characterized in that: The track unit (3) is laid flat on the side pad layer of the raft or on the reserved steel bars; and the track unit (3) is a steel section with a top opening, the limiting part (4) is set on the inner wall of the steel section near the top opening, and the end of the sliding unit (2) is limited between the bottom wall of the steel section and the limiting part (4).

3. The sliding concrete raft foundation winter insulation and curing shed according to claim 2, characterized in that: The track unit (3) is a channel steel, and the limiting part (4) is a clip welded to the upper ends of both sides of the inner wall of the channel steel.

4. The sliding concrete raft foundation winter insulation and curing shed according to claim 1, characterized in that: The scaffold unit includes support members (6) welded at equal intervals to the sliding unit (2), and an insulation layer (5) laid on the support members (6); the insulation layer (5) is tied and fixed to the support members (6) by tie wires; the skeleton formed by the support members (6) is arched or sloping.

5. The sliding concrete raft foundation winter insulation and curing shed according to claim 1, characterized in that: The inner support member (7) is set at equal intervals on the inner side of the shed unit. Its upper end is connected to the inner side of the shed unit, and its lower end is fixedly connected to the reserved wall column reinforcement of the raft slab through straight threaded steel bars. The sliding unit (2) can drive the support member (6) and the insulation layer (5) to slide along the track (3) as a whole, and cover the poured area synchronously with the concrete pouring progress.

6. The sliding concrete raft foundation winter insulation and curing shed according to any one of claims 1 to 5, characterized in that: The fixing component (1) is an expansion bolt; the track unit (3) is a 5# channel steel; the clamp is an A12 round steel; the sliding unit (2) is a C20 threaded steel; the support component (6) is made of Φ60 coarse steel wire; the insulation layer (5) is made of thick plastic cloth, which is used to maintain the curing temperature inside the shed by utilizing the heat of concrete hydration.

7. A construction method for a sliding concrete raft foundation winter insulation and curing shed as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Track laying: The track unit (3) is laid on the side pad layer or edge reserved steel bar on both sides of the raft slab and fixed by the fastener (1); S2. Sliding component assembly: The sliding unit (2) is embedded into the track unit (3) so that it can slide freely; S3. Scaffolding sliding and covering: Concrete is poured in layers from one side of the raft to the other. When the concrete begins to finish, the assembled scaffolding is slowly slid from the poured side to the unpoured side to cover the newly poured concrete. S4. Inner reinforcement: As the sliding progresses, the inner support (7) is installed on the inner side of the scaffold, and the lower end of the inner support (7) is connected and fixed to the reserved wall column steel bars of the raft slab to prevent the scaffold from sinking or collapsing.

8. The construction method of the sliding concrete raft foundation winter insulation and curing shed according to claim 7, characterized in that: In step S1, after the track unit (3) is laid flat and its straightness is adjusted, a fixing piece (1) is installed every 1000mm to fix it; if it is laid on the reserved steel bar, the fixing piece (1) is welded to the reserved steel bar. In step S4, as the sliding progresses, an inner support member (7) is installed every 1500mm on the inner side of the scaffold.

9. The construction method of the sliding concrete raft foundation winter insulation and curing shed according to claim 7, characterized in that, Also includes: S5. Curing operations: After the shed is closed, the surface is finished and covered with film or insulation cotton inside the shed; the curing temperature inside the shed is maintained by the heat of concrete hydration, or a warm air fan is installed inside the shed. S6. Removal and reuse: After the raft slab has reached the required strength, the inner support (7), insulation layer (5), support (6), sliding unit (2) and track unit (3) are removed in sequence and cleaned for use in subsequent projects.

10. The construction method of the sliding concrete raft foundation winter insulation and curing shed according to claim 7, characterized in that, The method for manufacturing the scaffolding prior to step S2. Includes the following steps: Cut steel sections to serve as the track unit (3), and weld fasteners (4) to the upper ends of both sides of the inner wall of the track unit (3). Cut the reinforcing bar as the sliding unit (2); The support member (6) is welded to the sliding unit (2) at 500mm intervals to form an arched frame; Cover the outside of the support member (6) with the insulation layer (5) and tie it with wire every 200mm.

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