Detachable assembly type steel-concrete combined bracing slab belt structure and construction method thereof

Abstract

The application discloses a detachable assembly type steel-concrete combined bracing slab belt structure and a construction method thereof, which is changed into a steel-concrete assembly type structure, utilizes prefabricated steel boxes, fills the boxes with cast-in-place concrete, pre-buries supporting brackets at a surrounding pile (wall) and a floor slab, installs the prefabricated steel boxes on the supporting brackets, fills and consolidates the space between the separated piles and the two prefabricated steel boxes by using post-cast concrete to form a post-transmission slab, connects the prefabricated steel bars on the two sides of the separated piles through the post-transmission slab to form a bracing system, is convenient to operate, can realize the detachable turnover use of the bracing structure, and realizes green and low-carbon construction. The application solves the problems that the existing bracing slab belt of a foundation pit needs to be supported and poured, and the subsequent concrete bracing slab belt is broken into construction waste and transported out, and the construction cost is high.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a detachable prefabricated steel-concrete composite support plate structure and its construction method. Background Technology

[0002] Existing methods for supporting and replacing supports in large-scale foundation pit engineering (such as Chinese patent publication number CN115787671A) include the following steps: erecting an internal support structure system and setting up an enclosure; laying reinforcement bars for the base slab and the base slab support, and reserving a post-cast strip for the base slab; setting a first steel force transmission strip within the post-cast strip of the base slab; integrally casting the base slab and the base slab support; casting the external walls and main beams of the construction structure; laying floor slab reinforcement bars and floor slab force transmission strip reinforcement, and reserving a post-cast strip for the floor slab; setting a second steel force transmission strip within the post-cast strip of the floor slab; casting the floor slab and the floor slab force transmission strip; and dismantling the internal support structure system. This support replacement method is simple to construct, accelerates the construction period, saves costs, improves the overall rigidity between the support and the enclosure, allows for the reuse of steel sections, and effectively ensures the quality and strength of the concrete; the steel force transmission strip within the post-cast strip allows for reasonable stress transfer and distribution after the support is removed; the floor slab force transmission strip has the same thickness as the floor slab and is integrally cast, facilitating construction.

[0003] The existing foundation pit replacement support strips require formwork and pouring, and the subsequent crushing of the concrete replacement support strips results in construction waste that is transported away, leading to high construction costs. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, a detachable prefabricated steel-concrete composite replacement support plate structure and its construction method are provided to solve the problems of existing foundation pit replacement support plates requiring formwork and pouring, and subsequent high construction costs due to the crushing of concrete replacement support plates into construction waste.

[0005] To achieve the above objectives, a detachable, prefabricated steel-concrete composite support plate structure is provided, comprising:

[0006] Multiple supporting brackets are provided. Two side walls are formed on the basement floor slab, and a partition groove is formed between the two side walls. A partition pile is passed through the basement floor slab and extends into the partition groove. The partition pile is set along the length of the partition groove. Multiple supporting brackets are installed on the opposite sides of the side walls and the partition piles, and the multiple supporting brackets are spaced apart in the horizontal direction.

[0007] A precast steel box is filled with pre-cast concrete. The precast steel box is embedded between the side wall and the partition pile. The opposite sides of the precast steel box rest on two adjacent supporting brackets on the side wall and the partition pile. The positions of the precast steel boxes on opposite sides of the partition pile correspond one-to-one. The position of the precast steel box corresponds to the position of the floor slab on the opposite side of the two side walls. The two precast steel boxes on opposite sides of the partition pile and the partition pile enclose a post-cast space.

[0008] Post-cast concrete is poured into the post-cast space to solidify and form a post-transfer plate. The post-transfer plate is connected between two precast steel boxes on opposite sides of the dividing pile to form a detachable assembled steel-concrete composite support plate structure.

[0009] Furthermore, multiple precast steel spacers are provided on each side of the separating pile.

[0010] Furthermore, the precast steel box is provided with an inner supporting steel frame on its inner side, and the pre-cast concrete covers the inner supporting steel frame.

[0011] Furthermore, the prefabricated steel box includes two rectangular steel plates arranged opposite each other, and a side box plate is connected between the outer edges of the two rectangular steel plates.

[0012] Furthermore, the internal support steel frame includes multiple horizontal ribs and multiple vertical ribs arranged in a cross pattern. The horizontal ribs and the vertical ribs are arranged vertically. The two ends of the horizontal ribs and the vertical ribs are respectively connected to the side box plate. The upper and lower sides of the horizontal ribs and the vertical ribs are respectively connected to the opposite sides of the two rectangular steel plates. The horizontal ribs and the vertical ribs are respectively provided with multiple guide holes.

[0013] This invention provides a construction method for a detachable prefabricated steel-concrete composite support plate structure, comprising the following steps:

[0014] Precast concrete was poured into the precast steel box;

[0015] Multiple supporting brackets are installed on the opposite sides of the side wall and the dividing pile, and the multiple supporting brackets are spaced apart in the horizontal direction;

[0016] The precast steel box is embedded between the side wall and the dividing pile. The opposite sides of the precast steel box rest on two adjacent supporting brackets on the side wall and the dividing pile. The positions of the precast steel boxes on the opposite sides of the dividing pile correspond one-to-one. The position of the precast steel box corresponds to the position of the floor slab on the opposite side of the two side walls, so that the two precast steel boxes on the opposite sides of the dividing pile and the dividing pile enclose the post-cast space.

[0017] Post-cast concrete is poured into the post-cast space to solidify and form a post-transfer plate, which is then connected between two precast steel boxes on opposite sides of the dividing pile to form a detachable assembled steel-concrete composite support plate structure.

[0018] The beneficial effects of this invention are that the detachable prefabricated steel-concrete composite support plate structure and its construction method are changed to a steel-concrete prefabricated structure. Prefabricated steel boxes are used, and the boxes are filled with pre-cast concrete. Support brackets are pre-embedded at the retaining piles (walls) and floor slabs. The prefabricated steel boxes are installed on the support brackets. The gaps between the separating piles and the two prefabricated steel boxes are filled with post-cast concrete to form a post-transfer plate. The prefabricated steel bars on both sides of the separating piles are connected through the post-transfer plate to form a support system. The operation is convenient and the support structure can be disassembled and reused, realizing green and low-carbon construction. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the detachable and assembled steel-concrete composite support plate structure according to an embodiment of the present invention.

[0021] Figure 2 This is a partially enlarged schematic diagram of the detachable and assembled steel-concrete composite support plate structure according to an embodiment of the present invention.

[0022] Figure 3 This is a top view of the detachable and assembled steel-concrete composite support plate structure according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the structure of the prefabricated steel box according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the internal support steel frame according to an embodiment of the present invention. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Reference Figures 1 to 5As shown, the present invention provides a detachable assembled steel-concrete composite support plate structure, including: a support bracket 1, a prefabricated steel box 2, and a rear transmission plate 3.

[0028] In this embodiment, refer to Figure 1 As shown, two side walls 5 are formed on the basement floor slab 4. A dividing trench is formed between the two side walls 5. Dividing piles are driven into the foundation pit. Dividing piles 6 penetrate the basement floor slab 4. Dividing piles 6 extend into the dividing trench. Dividing piles 6 are set along the length of the dividing trench. The dividing piles consist of multiple retaining piles set continuously.

[0029] Multiple supporting brackets 1 are installed on opposite sides of the side wall 5 and the dividing pile 6. Multiple supporting brackets 1 are installed on the side of the side wall 5. Multiple supporting brackets 1 are installed on opposite sides of the dividing pile 6. The multiple supporting brackets 1 are spaced apart horizontally. The positions of the supporting brackets on the dividing pile correspond to those of the supporting brackets on the side wall.

[0030] The precast steel box 2 is a rectangular steel box. Precast steel box 2 is filled with pre-cast concrete. The precast steel box 2 is embedded between the side wall 5 and the partition piles 6. The opposite sides of the precast steel box 2 rest on two adjacent supporting brackets 1 on the side wall 5 and the partition piles 6, respectively. The positions of the precast steel boxes 2 on opposite sides of the partition piles 6 correspond one-to-one. The positions of the precast steel boxes 2 correspond to the positions of the floor slabs 7 on the opposite sides of the side walls 5. The two precast steel boxes 2 on opposite sides of the partition piles 6, together with the partition piles 6, enclose a post-cast space.

[0031] As a preferred embodiment, multiple precast steel intervals are provided on each side of the dividing pile 6.

[0032] The inner side of the precast steel box 2 is equipped with an inner supporting steel frame. Concrete is poured first to cover the inner supporting steel frame.

[0033] The prefabricated steel box 2 comprises two rectangular steel plates arranged opposite each other. Side panels are connected between the outer edges of the two rectangular steel plates.

[0034] The internal support steel frame includes multiple horizontal ribs 21 and multiple vertical ribs 22 arranged in a cross pattern. The horizontal ribs 21 and vertical ribs 22 are arranged vertically. The two ends of the horizontal ribs 21 and vertical ribs 22 are respectively connected to the side box plate. The upper and lower sides of the horizontal ribs 21 and vertical ribs 22 are respectively connected to the opposite sides of two rectangular steel plates. The horizontal ribs 21 and vertical ribs 22 are respectively provided with multiple guide holes.

[0035] Post-cast concrete is poured into the post-cast space. The post-cast concrete solidifies to form the post-transfer plate 3. The post-transfer plate 3 is connected between two precast steel boxes 2 on opposite sides of the dividing pile 6 to form a detachable assembled steel-concrete composite support plate structure.

[0036] This invention provides a construction method for a detachable prefabricated steel-concrete composite support plate structure, comprising the following steps:

[0037] S1: Precast concrete is poured into the precast steel box 2.

[0038] S2: Multiple supporting brackets 1 are installed on the opposite sides of the side wall 5 and the dividing pile 6, and the multiple supporting brackets 1 are spaced apart in the horizontal direction.

[0039] S3: The precast steel box 2 is embedded between the side wall 5 and the partition pile 6. The opposite sides of the precast steel box 2 are respectively placed on the two adjacent support brackets 1 on the side wall 5 and the partition pile 6. The positions of the precast steel boxes 2 on the opposite sides of the partition pile 6 correspond one-to-one. The position of the precast steel box 2 corresponds to the position of the floor slab 7 on the opposite side of the side wall 5, so that the two precast steel boxes 2 on the opposite sides of the partition pile 6 and the partition pile 6 enclose the post-casting space.

[0040] S4: Pour post-cast concrete in the post-cast space to solidify and form a post-transfer plate, so that the post-transfer plate is connected between two precast steel boxes 2 on opposite sides of the dividing pile 6 to form a detachable assembled steel-concrete composite support plate structure.

[0041] In large-scale foundation pit construction, the foundation pit support system needs to be replaced before the removal of the supports at the dividing trench. This is typically done by directly casting the lower floor slab and the dividing piles (walls) together with concrete to form a replacement support system. However, the detachable prefabricated steel-concrete composite replacement support plate structure and its construction method of this invention are replaced with a steel-concrete prefabricated structure. Precast steel boxes are filled with pre-cast concrete, and support brackets are pre-embedded at the retaining piles (walls) and floor slabs. The precast steel boxes are then installed onto the support brackets. The gaps between the dividing piles and the two precast steel boxes are filled and solidified with post-cast concrete to form a post-transfer plate. The precast reinforcing bars on both sides of the dividing piles are connected through the post-transfer plate to form the replacement support system. This method is convenient to operate and allows for the detachable and reusable replacement support structure, achieving green and low-carbon construction.

[0042] The present invention discloses a construction method for a detachable prefabricated steel-concrete composite support plate strip structure. Prefabricated steel boxes are fabricated according to the distance between the separating piles and the sidewalls of the underground structure. Each prefabricated steel box is installed every 3 meters along the length of the separating pile, with each span being 3 meters long. The prefabricated steel box is welded from 14mm thick Q235 steel plates. A steel plate is placed at the bottom of the box, and the upper part is hollowed out and filled with C25 concrete. Horizontal and longitudinal ribs are installed every 50cm in the middle to form a force-transfer plate strip. The force-transfer plate strip is prefabricated on the ground.

[0043] At the elevation of the floor slab corresponding to the side wall of the dividing pile, the vertical main reinforcement of the dividing pile is chiseled out and a supporting bracket is welded. The supporting bracket is a 15cm × 30cm, 2cm thick triangular steel plate, and the short right-angle side of the supporting bracket is welded to the vertical main reinforcement of the dividing pile.

[0044] After the floor slab on the opposite side of the side wall has been constructed to the design strength and the supporting brackets have been installed, the precast load transfer slab strip is hoisted and placed on top of the supporting brackets. The precast load transfer slab strip must be installed tightly against the side wall. The gap between the precast load transfer slab strip and the adjacent support piles of the dividing pile (i.e., the post-pouring space) is filled with post-pouring concrete (i.e., C30 mortar) to solidify and form the post-load transfer slab.

[0045] The rear transmission plate is installed every 3m along the direction of the trench. After the upper support 8 of the foundation pit is removed, the precast force transmission plate and the rear transmission plate are subjected to overall force, and the replacement support system is formed.

[0046] The detachable, prefabricated steel-concrete composite support strip structure of this invention uses prefabricated steel-concrete composite force-transmitting strips at the dividing trough, which have good compressive strength and force transmission characteristics. The prefabricated force-transmitting strips are installed on supporting brackets, replacing the traditional formwork and concrete strip method, achieving rapid, simple, and efficient installation. Furthermore, the force-transmitting strips are reusable. Traditional concrete support strips, when broken, become construction waste and are transported off-site. The force-transmitting strips of this invention can be reused multiple times, the steel plates are recyclable, and it is environmentally friendly and low-carbon.

[0047] The detachable prefabricated steel-concrete composite support plate structure of the present invention can be widely used in the support structure system of the trough section floor slab.

[0048] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A detachable, prefabricated steel-concrete composite support plate structure, characterized in that, include: Multiple supporting brackets are provided. Two side walls are formed on the basement floor slab, and a partition groove is formed between the two side walls. A partition pile is passed through the basement floor slab and extends into the partition groove. The partition pile is set along the length of the partition groove. Multiple supporting brackets are installed on the opposite sides of the side walls and the partition piles, and the multiple supporting brackets are spaced apart in the horizontal direction. A precast steel box is filled with pre-cast concrete. The precast steel box is embedded between the side wall and the partition pile. The opposite sides of the precast steel box rest on two adjacent supporting brackets on the side wall and the partition pile. The positions of the precast steel boxes on opposite sides of the partition pile correspond one-to-one. The position of the precast steel box corresponds to the position of the floor slab on the opposite side of the two side walls. The two precast steel boxes on opposite sides of the partition pile and the partition pile enclose a post-cast space. Post-cast concrete is poured into the post-cast space to solidify and form a post-transfer plate. The post-transfer plate is connected between two precast steel boxes on opposite sides of the dividing pile to form a detachable assembled steel-concrete composite support plate structure.

2. The detachable prefabricated steel-concrete composite support plate structure according to claim 1, characterized in that, The precast steel boxes are spaced apart on each side of the dividing pile.

3. The detachable prefabricated steel-concrete composite support plate structure according to claim 1, characterized in that, The precast steel box is provided with an inner supporting steel frame on its inner side, and the pre-cast concrete covers the inner supporting steel frame.

4. The detachable prefabricated steel-concrete composite support plate structure according to claim 3, characterized in that, The prefabricated steel box includes two rectangular steel plates arranged opposite each other, and a side box plate is connected between the outer edges of the two rectangular steel plates.

5. The detachable prefabricated steel-concrete composite support plate structure according to claim 4, characterized in that, The internal support steel frame includes multiple horizontal ribs and multiple vertical ribs arranged in a cross pattern. The horizontal ribs and the vertical ribs are arranged vertically. The two ends of the horizontal ribs and the vertical ribs are respectively connected to the side box plate. The upper and lower sides of the horizontal ribs and the vertical ribs are respectively connected to the opposite sides of the two rectangular steel plates. The horizontal ribs and the vertical ribs are respectively provided with multiple guide holes.

6. A construction method for a detachable prefabricated steel-concrete composite support plate structure as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Precast concrete was poured into the precast steel box; Multiple supporting brackets are installed on the opposite sides of the side wall and the dividing pile, and the multiple supporting brackets are spaced apart in the horizontal direction; The precast steel box is embedded between the side wall and the dividing pile. The opposite sides of the precast steel box rest on two adjacent supporting brackets on the side wall and the dividing pile. The positions of the precast steel boxes on the opposite sides of the dividing pile correspond one-to-one. The position of the precast steel box corresponds to the position of the floor slab on the opposite side of the two side walls, so that the two precast steel boxes on the opposite sides of the dividing pile and the dividing pile enclose the post-cast space. Post-cast concrete is poured into the post-cast space to solidify and form a post-transfer plate, which is then connected between two precast steel boxes on opposite sides of the dividing pile to form a detachable assembled steel-concrete composite support plate structure.

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