Recyclable and reusable prefabricated top beam and construction method thereof

Abstract

The invention discloses a recoverable and reusable prefabricated assembly type crown beam and a construction method thereof, and belongs to the technical field of building construction.The recoverable and reusable prefabricated assembly type crown beam comprises a plurality of prefabricated crown beams which are detachably connected end to end in sequence, and the two opposite sides of each prefabricated crown beam are provided with an end steel plate and an end steel formwork respectively; the end steel plates of the prefabricated top beams and the end steel formworks of the adjacent prefabricated top beams jointly form post-pouring slurry concrete formworks. The method is green and low-carbon, the crown beam can be recycled after construction is completed, waste of building materials is avoided, investment of temporary measures for construction is reduced, green and low-carbon construction of the crown beam is achieved, and cost reduction and benefit improvement of enterprises are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a recyclable and reusable prefabricated assembled crown beam and a construction method thereof. Background Art

[0002] Conventional crown beam design and construction include pile head chiseling, mortar leveling, formwork support, steel bar tying, concrete pouring, maintenance and other construction procedures. The construction steps are cumbersome, the on-site labor cost is high, the construction period is long, and the crown beam cannot be recycled after the construction is completed, resulting in a lot of material waste. Summary of the invention

[0003] In order to solve the above problems, the present invention adopts the following technical solutions:

[0004] Recyclable and reusable prefabricated crown beam, including:

[0005] A plurality of prefabricated crown beams are detachably connected end to end in sequence, wherein opposite sides of the prefabricated crown beams are respectively provided with end steel plates and end steel formworks, and the end steel plates of the prefabricated crown beams and the end steel formworks of the adjacent prefabricated crown beams jointly form a post-cast grouting concrete formwork.

[0006] Furthermore, a plurality of main bars are arranged in the prefabricated crown beam, and the plurality of main bars are arranged at intervals along the circumferential direction of the cross section of the prefabricated crown beam, and each of the main bars extends along the length direction of the prefabricated crown beam, and one end of the main bar passes through the end steel plate, and the other end passes through the end steel formwork;

[0007] Among them, one end of the same main reinforcement is provided with a steel bar protective cover fixer, and the other end is provided with a steel bar connector, and the steel bar protective cover fixer and the steel bar connector located on the same side are alternately arranged, and the steel bar connectors on the two adjacent prefabricated crown beams are connected to the ends of the corresponding main reinforcements, and a retractable steel bar protective cover is sleeved on the outside of the connected assembly.

[0008] Furthermore, both ends of the retractable steel bar protective cover are fixed by cable ties.

[0009] Furthermore, the prefabricated crown beam is provided with a plurality of pile head steel bar reserved holes corresponding to the pile head steel bars, and a first embedded sleeve is provided in the pile head steel bar reserved holes.

[0010] Furthermore, a plurality of anchor cable reserved holes are arranged on the side surface of the prefabricated crown beam, and a second embedded sleeve is arranged in the anchor cable reserved holes.

[0011] A construction method for a recyclable and reusable prefabricated and assembled crown beam, using any of the recyclable and reusable prefabricated and assembled crown beams described above, the method comprising the following steps:

[0012] S10. Before over-casting concrete at the head of the retaining pile, the main reinforcement of the retaining pile located at the over-casting concrete part shall be protected by plastic sleeves before over-casting concrete is poured to the designed elevation;

[0013] S20. Temporary retaining steel plates are installed outside the retaining piles, and then the over-concrete part of the pile head is chiseled out to the designed elevation;

[0014] S30, placing the prefabricated crown beam, passing the main reinforcement of the pile head through the reserved holes of the pile head reinforcement reserved in the prefabricated crown beam, and placing the prefabricated crown beam in place;

[0015] S40, measure and lay out, adjust the splicing position to meet the design requirements, and grout the connections between the prefabricated crown beam, pile head and anchor cable;

[0016] S50, splice the prefabricated crown beam, connect the main reinforcement of the prefabricated crown beam to the designed position through the reinforcement connector, and then stretch the retractable reinforcement protective cover of the main reinforcement to the fixed end and fix it with a cable tie for protection;

[0017] S60, pour concrete at the joints and vibrate to make it dense;

[0018] S70, after the construction is completed, the concrete at the joints is chiseled out and the prefabricated crown beams are recovered;

[0019] S80, maintain and repair, waiting for next use.

[0020] Beneficial effects:

[0021] The invention is simple to construct, and can simplify the construction steps through the rapid assembly of prefabricated crown beams, reduce labor cost investment, and shorten the construction period.

[0022] The present invention is green and low-carbon, and the crown beam can be recycled after the construction is completed, thereby avoiding waste of building materials and reducing investment in temporary construction measures, thereby achieving green and low-carbon construction of the crown beam and reducing costs and increasing efficiency for the enterprise.

[0023] The present invention has strong versatility and is suitable for crown beam applications of foundation pit retaining structures in all scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the axonometric view of the prefabricated crown beam of the first structural form of the present invention Figure 1 ;

[0025] Figure 2 A schematic diagram of the axonometric view of the prefabricated crown beam of the first structural form of the present invention Figure 2 ;

[0026] Figure 3 A schematic diagram of a front view of a prefabricated crown beam of the first structural form of the present invention;

[0027] Figure 4 A side view of the prefabricated crown beam of the first structural form of the present invention Figure 1 ;

[0028] Figure 5 A side view of the prefabricated crown beam of the first structural form of the present invention Figure 2 ;

[0029] Figure 6 A schematic diagram of the axonometric view of the prefabricated crown beam of the second structural form of the present invention Figure 1 ;

[0030] Figure 7 A schematic diagram of the axonometric view of the prefabricated crown beam of the second structural form of the present invention Figure 2 ;

[0031] Figure 8 A schematic diagram of a front view of a prefabricated crown beam of a second structural form of the present invention;

[0032] Fig. 9 A side view of the prefabricated crown beam of the second structural form of the present invention Figure 1 ;

[0033] Fig.10 A side view of the prefabricated crown beam of the second structural form of the present invention Figure 2 ;

[0034] Fig.11 This is a schematic diagram of the connection of multiple sections of prefabricated crown beams of the present invention;

[0035] Among them, 1. End steel plate; 2. Steel bar protective cover fixer; 3. Main reinforcement; 4. Cable tie; 5. Retractable steel bar protective cover; 6. Pile head steel bar reserved hole; 7. First embedded sleeve; 8. End steel formwork; 9. Steel bar connector; 10. Anchor cable reserved hole; 11. Second embedded sleeve. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0039] Example 1

[0040] refer to Figure 1 - Figure 5 , Fig.11 , recyclable and reusable prefabricated crown beam, including:

[0041] A plurality of prefabricated crown beams are detachably connected end to end in sequence, and an end steel plate 1 and an end steel formwork 8 are respectively provided on opposite sides of the prefabricated crown beam. The end steel plate 1 of the prefabricated crown beam and the end steel formwork 8 of the adjacent prefabricated crown beam jointly form a post-cast grouting concrete formwork.

[0042] During specific implementation, the end steel plate 1 and the end steel formwork 8 together form a post-grouting concrete formwork to isolate the post-grouting concrete from the main body, thereby achieving the purpose of disassembling and recycling the crown beam in the later stage.

[0043] In this embodiment, a plurality of main ribs 3 are arranged in the prefabricated crown beam, and the plurality of main ribs 3 are arranged at intervals along the circumferential direction of the cross section of the prefabricated crown beam. Each main rib 3 extends along the length direction of the prefabricated crown beam, and one end of the main rib 3 passes through the end steel plate 1, and the other end passes through the end steel formwork 8;

[0044] In specific implementation, the main reinforcement 3 is one of the main parts connecting the two prefabricated crown beams. Both ends are provided with threads, and the threads at both ends are connected by a steel bar connector 9. The staggered arrangement achieves the purpose of improving the shear resistance of the prefabricated crown beam.

[0045] Among them, one end of the same main reinforcement 3 is provided with a steel bar protection cover fixer 2, and the other end is provided with a steel bar connector 9, and the steel bar protection cover fixer 2 and the steel bar connector 9 located on the same side are alternately arranged, and the steel bar connectors 9 on the two adjacent prefabricated crown beams are connected to the ends of the corresponding main reinforcement 3, and a retractable steel bar protection cover 5 is sleeved on the outside of the connected assembly.

[0046] In specific implementation, the function of the steel bar protective cover fixer 2 is to fix the retractable steel bar protective cover 5, protect the crown beam main reinforcement 3 and the steel bar connector 9 from being contaminated by the later grouting, and achieve the purpose of separating the post-cast concrete from the steel bars.

[0047] During specific implementation, the retractable steel bar protection cover 5 is a disposable consumable material for protecting the crown beam main bars 3 and the steel bar connectors 9, ensuring that the crown beam main bars 3 and the steel bar connectors 9 are not contaminated by the subsequent grouting, thereby achieving the purpose of separating the post-poured concrete from the steel bars.

[0048] During specific implementation, the steel bar connector 9 is the main device for connecting the crown beam main bars 3, and the internal threads are matched with the threads of the crown beam main bars 3.

[0049] In other embodiments, a retractable tube such as a PVC tube may be sleeved on the outside of the assembly.

[0050] In this embodiment, both ends of the retractable steel bar protective cover 5 are fixed by cable ties 4 .

[0051] In specific implementation, the tie 4 is a disposable consumable material for fixing the crown beam main reinforcement 3 on the reinforcement protection sleeve fixer 2.

[0052] In other embodiments, it can also be fixed by items such as metal clamps.

[0053] In this embodiment, a plurality of pile head steel bar reserved holes 6 corresponding to the pile head steel bars are arranged on the prefabricated crown beam, and a first embedded sleeve 7 is arranged in the pile head steel bar reserved holes 6 .

[0054] During specific implementation, the reserved hole 6 for the pile head reinforcement passes through the prefabricated crown beam.

[0055] In specific implementation, the reserved hole 6 for pile head reinforcement is a reserved hole for combining the crown beam with the reinforcement of the pile head of the surrounding pile, and a first embedded sleeve 7 is arranged in the hole to ensure the integrity of the crown beam and the surrounding pile.

[0056] In specific implementation, the first embedded sleeve 7 is a device for isolating the post-cast concrete in the reserved hole 6 for the pile head reinforcement from the main concrete, so as to ensure smooth disassembly and recycling in the later stage.

[0057] In this embodiment, the prefabricated crown beam is composed of four vertical surfaces, and one of the surfaces has a protrusion.

[0058] Example 2

[0059] refer to Figure 6 - Fig.11 This embodiment provides another structural form of a prefabricated crown beam. The difference between this embodiment and Embodiment 1 is that one of the surfaces of the prefabricated crown beam is set to be inclined and connected to the raised portion at the lower end.

[0060] In this embodiment, a plurality of anchor cable reserved holes 10 are arranged on the side surface of the prefabricated crown beam, and a second embedded sleeve 11 is arranged in the anchor cable reserved holes 10 .

[0061] In specific implementation, the anchor cable reserved hole 10 is a reserved hole for combining the crown beam with the anchor cable, and a second embedded sleeve 11 is arranged in the hole to ensure the integral force of the crown beam and the anchor cable.

[0062] In specific implementation, the second embedded sleeve 11 is a device for isolating the post-cast concrete in the anchor cable reserved hole 10 from the main concrete, ensuring smooth disassembly and recovery in the later stage.

[0063] Example 3

[0064] The present embodiment provides a construction method for a recyclable and reusable prefabricated and assembled crown beam, using the recyclable and reusable prefabricated and assembled crown beam provided in Embodiment 1 or Embodiment 2, and the method comprises the following steps:

[0065] S10, before over-casting concrete at the head of the retaining pile, the main reinforcement 3 of the retaining pile located at the over-casting concrete part is protected by a plastic casing and then over-casting concrete is applied to the designed elevation;

[0066] S20. Temporary retaining steel plates are installed outside the retaining piles, and then the over-concrete part of the pile head is chiseled out to the designed elevation;

[0067] S30, placing the prefabricated crown beam, passing the main reinforcement 3 of the pile head through the reserved hole 6 of the pile head reinforcement reserved in the prefabricated crown beam, and placing the prefabricated crown beam in place;

[0068] S40, measure and lay out, adjust the splicing position to meet the design requirements, and grout the connections between the prefabricated crown beam, pile head and anchor cable;

[0069] S50, splicing the prefabricated crown beam, connecting the prefabricated crown beam main reinforcement 3 to the designed position through the reinforcement connector 9, and then stretching the retractable reinforcement protection cover 5 of the main reinforcement 3 to the fixed end and fixing it with the cable tie 4 for protection;

[0070] S60, pour concrete at the joints and vibrate to make it dense;

[0071] S70, after the construction is completed, the concrete at the joints is chiseled out and the prefabricated crown beams are recovered;

[0072] S80, maintain and repair, waiting for next use.

[0073] In this embodiment, the prefabricated crown beam is in a straight line shape, and may also be in a Z shape, an L shape, an H shape, etc.

[0074] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. Recyclable and reusable prefabricated crown beam, characterized in that: include: A plurality of prefabricated crown beams are detachably connected end to end in sequence, wherein opposite sides of the prefabricated crown beams are respectively provided with end steel plates and end steel formworks, and the end steel plates of the prefabricated crown beams and the end steel formworks of the adjacent prefabricated crown beams jointly form a post-cast grouting concrete formwork.

2. The recyclable and reusable prefabricated assembled crown beam according to claim 1 is characterized in that: A plurality of main bars are arranged in the prefabricated crown beam, and the plurality of main bars are arranged at intervals along the circumferential direction of the cross section of the prefabricated crown beam, and each of the main bars extends along the length direction of the prefabricated crown beam, and one end of the main bar passes through the end steel plate, and the other end passes through the end steel formwork; Among them, one end of the same main reinforcement is provided with a steel bar protective cover fixer, and the other end is provided with a steel bar connector, and the steel bar protective cover fixer and the steel bar connector located on the same side are alternately arranged, and the steel bar connectors on the two adjacent prefabricated crown beams are connected to the ends of the corresponding main reinforcements, and a retractable steel bar protective cover is sleeved on the outside of the connected assembly.

3. The recyclable and reusable prefabricated crown beam according to claim 2 is characterized in that: Both ends of the retractable steel bar protective cover are fixed by cable ties.

4. The recyclable and reusable prefabricated crown beam according to claim 3 is characterized in that: The prefabricated crown beam is provided with a plurality of pile head steel bar reserved holes corresponding to the pile head steel bars, and a first embedded sleeve is arranged in the pile head steel bar reserved holes.

5. The recyclable and reusable prefabricated assembled crown beam according to claim 4 is characterized in that: A plurality of anchor cable reserved holes are arranged on the side surface of the prefabricated crown beam, and a second embedded sleeve is arranged in the anchor cable reserved holes.

6. A construction method for a recyclable and reusable prefabricated crown beam, characterized in that: The recyclable and reusable prefabricated assembled crown beam according to any one of claims 1 to 5 is used, and the method comprises the following steps: S10. Before over-casting concrete at the head of the retaining pile, the main reinforcement of the retaining pile located at the over-casting concrete part shall be protected by plastic sleeves before over-casting concrete is poured to the designed elevation; S20. Temporary retaining steel plates are installed outside the retaining piles, and then the over-concrete part of the pile head is chiseled out to the designed elevation; S30, placing the prefabricated crown beam, passing the main reinforcement of the pile head through the reserved holes of the pile head reinforcement reserved in the prefabricated crown beam, and placing the prefabricated crown beam in place; S40, measure and lay out, adjust the splicing position to meet the design requirements, and grout the connections between the prefabricated crown beam, pile head and anchor cable; S50, splice the prefabricated crown beam, connect the main reinforcement of the prefabricated crown beam to the designed position through the reinforcement connector, and then stretch the retractable reinforcement protective cover of the main reinforcement to the fixed end and fix it with a cable tie for protection; S60, pour concrete at the joints and vibrate to make it dense; S70, after the construction is completed, the concrete at the joints is chiseled out and the prefabricated crown beams are recovered; S80, maintain and repair, waiting for next use.

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