Prefabricated combined type enclosure structure

Abstract

The prefabricated combined type enclosure structure comprises a plurality of prefabricated piles inserted into the bottom of a foundation pit and further comprises a plurality of prefabricated top beams and prefabricated plates, the prefabricated plates are arranged between every two adjacent prefabricated piles, the lower ends of the prefabricated plates are inserted into the bottom of the foundation pit, and the upper ends of the prefabricated piles and the upper ends of the prefabricated plates are connected into a whole through the prefabricated top beams. The construction method has the beneficial effects that the construction efficiency is remarkably improved; the structural integrity and stability are enhanced; adaptability is high, and the application range is wide; environment-friendly and energy-saving effects are achieved, and the green construction concept is The construction quality is controllable, and the safety is high; the social and economic benefits are obvious.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building construction foundation pit and slope retaining, and particularly relates to a prefabricated combined retaining structure. BACKGROUND

[0002] In the field of building engineering, the safety, stability and construction efficiency of retaining structures such as foundation pit support and slope protection are extremely high. Traditional retaining structures mainly rely on cast-in-place concrete, steel sheet piles, bored piles and other processes, but there are the following significant problems: the cast-in-place concrete maintenance structure has a long construction period, the quality is difficult to control, and the environment is polluted, the steel sheet pile has high cost, limited applicability and insufficient durability, and the bored pile has unstable pile quality and a long construction period. In addition, the connection mode of the traditional support structure is mainly welding or bolt connection, which is complex to construct and has limited connection strength.

[0003] In recent years, prefabricated components have gradually increased in engineering applications, but existing prefabricated retaining structures have problems such as complex connection, poor integrity, and low construction efficiency. In order to solve the above problems, improve the construction efficiency, connection strength and overall stability, and reduce environmental pollution and resource waste, a prefabricated combined retaining structure that is convenient to construct, reliable to connect and strong in integrity is urgently needed. CONTENT OF THE INVENTION

[0004] Based on the above problems, the application provides a prefabricated combined retaining structure, which optimizes the connection mode and structure design through a prefabricated, modular and assembled technical route, improves the construction efficiency, connection strength and overall stability, realizes the rapid installation, high-strength connection and overall stability of the foundation pit support structure, and meets the needs of modern engineering construction. At the same time, it provides an industrialized solution that can be replicated and popularized for retaining engineering, which conforms to the strategic direction of transformation and upgrading of the construction industry and the goal of energy saving and carbon reduction.

[0005] The application achieves the above purposes through the following technical solutions:

[0006] A prefabricated combined retaining structure, comprising a plurality of prefabricated piles inserted into the bottom of a foundation pit, a plurality of prefabricated crown beams and a plurality of prefabricated plates, a prefabricated plate being arranged between two adjacent prefabricated piles, the lower end of the prefabricated plate being inserted into the bottom of the foundation pit, and the upper ends of the plurality of prefabricated piles and the plurality of prefabricated plates being connected into one body by the prefabricated crown beam.

[0007] Further, the prefabricated crown beam, the prefabricated pile and the prefabricated plate are all reinforced concrete structures.

[0008] Further, the bottom of the prefabricated crown beam is provided with a beam body plate groove and a beam body pile groove, the prefabricated pile is inserted into and cast connected in the beam body pile groove, and the prefabricated plate is inserted into and cast connected in the beam body plate groove.

[0009] Further, the beam body plate slot is communicated with the beam body pile slot, the beam body plate slot is a long slot, and the beam body pile slot is a square slot or a round slot.

[0010] Further, the slot depth of the beam body plate slot is less than the slot depth of the beam body pile slot.

[0011] Further, the prefabricated crown beam is provided with a grouting hole communicated to the lower end of the beam body plate slot or the beam body pile slot, and the prefabricated crown beam is provided with a grouting hole communicated to the upper end of the beam body plate slot or the beam body pile slot.

[0012] Further, the end of the prefabricated crown beam is provided with a connecting plate, and the adjacent two connecting plates are connected through bolts.

[0013] Further, the side of the prefabricated pile is provided with a pile body plate slot, and the side of the prefabricated plate is provided with a plate body clamping end clamped in the pile body plate slot.

[0014] Further, the pile body plate slot and the plate body clamping end are a T-shaped structure matched with each other.

[0015] Further, the prefabricated pile is provided with a reserved anchor rod hole, and the reserved anchor rod hole is provided with an anchoring assembly anchored in the soil body.

[0016] Further, the plurality of anchoring assemblies are connected as a whole through a waist beam.

[0017] Further, the prefabricated plate is divided into at least two layers, and the upper and lower prefabricated plates are mutually adhered and welded and fixed.

[0018] The beneficial effects of the present application are as follows:

[0019] 1. The construction efficiency is significantly improved: 1) prefabricated components factory production: prefabricated piles, prefabricated plates, prefabricated crown beams and other components adopt standardized design, quality is controllable, and are convenient for factory batch production and on-site rapid assembly, reducing the complexity and uncertainty of on-site construction; on-site assembly is convenient: through the design of sliding groove, grouting hole and the like, the rapid assembly of components is realized, and the construction period is greatly shortened. 2) Parallel operation: the production of prefabricated components and on-site construction can be carried out simultaneously, further improving the overall construction efficiency. 3) Reduce the process: since it is a factory prefabricated structure, the flatness is high, which can be used as a structural wall outer side template, reducing the process of installing the wall outer side template support, improving the construction efficiency, and avoiding the backfilling of the main structure and the foundation pit protection wall, eliminating the quality hidden danger that the settlement easily occurs after the backfilling of the fat groove.

[0020] 2. Enhanced structural integrity and stability: 1) Tight connection design: The prefabricated piles are connected with the prefabricated plates through sliding grooves, and the crown beams are connected with the prefabricated piles and plates through grooves and grouting, ensuring the tight fit between the components. 2) Anchor rod or anchor cable reinforcement: The combination of anchor rods or anchor cables and steel waist beams enhances the tensile performance and overall stability of the enclosure structure. 3) Grouting closure: The grouting process forms an integral structure between the crown beams and the prefabricated piles, further improving the stiffness and durability of the enclosure structure.

[0021] 3. Strong adaptability and wide application range: 1) Suitable for various geological conditions: By adjusting the length, diameter of the prefabricated piles and the arrangement of anchor rods or anchor cables, it can adapt to different geological conditions and engineering requirements. 2) Suitable for various engineering scenarios: Not only suitable for foundation pit support, but also for slope protection, retaining wall and other engineering, with wide application prospect. 3) Flexibility: The modular design of prefabricated components facilitates transportation, storage and installation, improving the flexibility and convenience of construction. The size of the components can be flexibly adjusted according to the engineering requirements to meet the enclosure requirements of different spans and heights.

[0022] 4. Environmentally friendly and energy saving, in line with green construction concept: 1) Reduce site pouring: The use of prefabricated components reduces the site concrete pouring operation, reduces construction noise and dust pollution. 2) High material utilization rate: Factory production can accurately control the amount of materials, reduce waste and reduce engineering cost.

[0023] 5. Controllable construction quality and high safety: 1) Factory prefabrication quality control: Prefabricated components are produced in factories, which can strictly control the size, strength and appearance quality, reducing the quality hidden dangers in site construction. 2) Standardized construction process: Through standardized construction process and flow, the risk of human operation error is reduced, and the construction safety is improved.

[0024] 6. Significant social and economic benefits: 1) Reduce labor cost: The assembly construction of prefabricated components reduces the number of site workers, reducing labor cost. 2) Shorten construction period: The improvement of construction efficiency directly shortens the construction period, reduces the engineering management cost and equipment rental cost. 3) Promote industry progress: The use of prefabricated combined enclosure structure promotes the development of building industry towards industrialization and standardization, promotes technological progress and industrial upgrading.

[0025] The foregoing main scheme of the present application and each further selection scheme thereof can be freely combined to form multiple schemes, all of which are the schemes that can be adopted and claimed by the present application; and the present application can also be freely combined between (each non-conflict selection) selections and between other selections. Those skilled in the art can understand that there are many combinations according to the prior art and common knowledge after understanding the schemes of the present application, all of which are the technical schemes claimed by the present application, and are not listed here. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is a structural elevation view of the present application.

[0027] Fig. 2 is a structural plan view of the present application.

[0028] Fig. 3 is a structural side view (cross-sectional view) of the present application.

[0029] In the figure: 1 - prefabricated crown beam, 2 - prefabricated pile, 3 - prefabricated plate, 5 - waist beam, 6 - foundation pit bottom; 101 - beam body plate groove, 102 - beam body pile groove, 103 - connecting plate, 104 - grouting hole, 105 - grouting hole, 201 - pile body plate groove, 202 - reserved anchor hole, 301 - plate body clamping end. DETAILED DESCRIPTION

[0030] The following non-limiting examples are intended to illustrate the present application.

[0031] Example 1

[0032] Reference Figs. 1-3 As shown in the figure, a prefabricated combined enclosure structure includes prefabricated crown beams 1, prefabricated piles 2, prefabricated plates 3, and waist beams 5.

[0033] The lower ends of the prefabricated piles 2 are inserted into the foundation pit bottom 6, and the prefabricated piles 2 serve as the support body of the enclosure structure. The prefabricated plates 3 are arranged between adjacent two prefabricated piles 2, and the lower ends of the prefabricated plates 3 are inserted into the foundation pit bottom 6. The prefabricated piles 2 and the prefabricated plates 3 jointly form a complete support surface to enclose the soil body. The upper ends of the prefabricated piles 2 and the prefabricated plates 3 are connected as a whole through the prefabricated crown beams 1 to improve the integrity and stability of the enclosure structure.

[0034] The prefabricated piles 2 have a cylindrical structure or a right quadrangular prism structure. In this case, the right quadrangular prism structure is adopted, and the side length is generally 0.6-1.0 m. High-strength prestressed reinforced concrete piles are used, and reinforcing bars are arranged in the piles to improve the bending and shearing resistance of the pile body.

[0035] The prefabricated piles 2 are provided with pile body plate grooves 201 on the side, and the prefabricated plates 3 are provided with plate body clamping ends 301 clamped in the pile body plate grooves 201 to realize the clamping connection between the prefabricated piles 2 and the prefabricated plates 3. The pile body plate grooves 201 and the plate body clamping ends 301 are T-shaped structures matched with each other, facilitating the insertion and fixation of the prefabricated plates 3, and the length of the pile body plate grooves 201 is consistent with the height of the prefabricated plates 3.

[0036] The prefabricated piles 2 are provided with reserved anchor holes 202, and sleeve pipes are pre-buried in the holes for the subsequent installation and grouting of anchor rods or anchor cables. The reserved anchor holes 202 are provided with anchoring assemblies anchored into the soil body, which act on the prefabricated piles 2 to improve the support strength and stability of the prefabricated piles 2.

[0037] The anchor rod adopts high-strength threaded steel, and the anchor cable adopts steel strand. The diameter and quantity are determined according to the design tension, and the length of the anchor rod or anchor cable is determined according to the geological conditions and design requirements. The anchor rod or anchor cable is punched into the guide hole reserved in the prefabricated pile. The insertion depth, angle, diameter and exposed length of the anchor rod are determined according to the design requirements, and cement slurry is injected into the drill hole to ensure that the slurry fills the drill hole and wraps the anchor rod or anchor cable, thereby enhancing the anchoring force and preventing corrosion.

[0038] Then the steel waist beam is made. The waist beam adopts H-shaped steel or I-shaped steel, and the cross-sectional size is determined according to the design load. The waist beam is connected to the anchor rod or anchor cable by bolts or welding. Several anchoring assemblies are connected by the waist beam 5 to form an integral force system, thereby enhancing the tensile and shear capacity of the supporting structure.

[0039] The prefabricated plate 3 adopts reinforced concrete plate and is a soil retaining member between piles of the enclosure structure. The plate thickness is generally 10-15 cm, and can be adjusted according to the design calculation or test data. The plate body is punched into the soil between two piles along the pile plate groove reserved in the prefabricated pile, and is integrally connected with the pile body to form a pile-plate composite structure. Sensors can be embedded in the plate body for monitoring the deformation and stress state of the enclosure structure.

[0040] The prefabricated plate 3 is divided into at least two layers, and the upper and lower two layers of the prefabricated plate 3 are adhered and welded together. The prefabricated plate 3 can be constructed in blocks according to actual needs, and the two plates are integrally connected by welding.

[0041] The prefabricated corbel beam 1 generally includes four to five piles with appropriate spacing. The prefabricated corbel beam 1 adopts a prefabricated reinforced concrete structure, and is internally provided with longitudinal main reinforcement and stirrups to ensure bending and shear performance. The prefabricated corbel beam 1 has a rectangular structure. The bottom of the corbel beam is provided with a beam body pile groove 102 matching the outer diameter of the pile top and a beam body plate groove 101 matching the thickness of the plate top. The inner diameter of the groove is slightly larger than the outer diameter of the pile and the thickness of the plate to facilitate installation.

[0042] The beam body plate groove 101 and the beam body pile groove 102 are connected in series to match the continuous connection of the pile body and the plate body. The beam body plate groove 101 is a long groove, and the beam body pile groove 102 is a square groove or a circular groove. The prefabricated pile 2 is inserted into and cast in the beam body pile groove 102, and the prefabricated plate 3 is inserted into and cast in the beam body plate groove 101. The surface of the part of the pile top anchored into the corbel beam is roughened to facilitate better connection with the corbel beam structure after grouting. The groove depth of the beam body plate groove 101 is smaller than the groove depth of the beam body pile groove 102 to enhance the connection strength of the pile body and the beam body.

[0043] The prefabricated corbel 1 is provided with a grouting hole 104 communicated to the lower end of the beam body plate groove 101 or the beam body pile groove 102, and is provided with a grout outlet hole 105 communicated to the upper end of the beam body plate groove 101 or the beam body pile groove 102. A plurality of grouting holes and grout outlet holes are reserved on the side surface of the corbel, and the corbel is connected with the prefabricated pile and the prefabricated plate by grouting.

[0044] The end of the prefabricated corbel 1 is fixedly provided with a connecting plate 103, the connecting plate 103 is pre-buried or subsequently welded on the corbel, the adjacent two connecting plates 103 are connected through bolts, the prefabricated corbel segments are connected through high-strength bolts, and the overall stress of the corbel is realized.

[0045] The prefabricated pile and the prefabricated plate are connected through the clamping groove, the corbel is preliminarily connected with the prefabricated pile and the prefabricated plate through the groove structure, then high-strength grout is injected through the grouting hole to make the corbel tightly combined with the prefabricated pile and the prefabricated plate, with the excavation of the earthwork, the anchor rod or the anchor cable forms a pile-anchor system through the reserved guide hole, and finally the structure forms a pile-anchor-plate overall supporting structure.

[0046] The construction method of the prefabricated combined enclosure structure comprises the following steps: prefabricated pile 2 installation: a plurality of interval arranged prefabricated piles 2 are driven into the foundation pit bottom 6. According to the design drawing, the pile position and the pile spacing of the prefabricated pile 2 are determined, and the marks are made, the prefabricated pile 2 is driven into the soil body according to the design position, the pile body perpendicularity deviation is ensured to be not more than 1%, and the clamping groove installation position is accurate, and the clamping groove center is longitudinally in a straight line.

[0047] Prefabricated plate 3 installation: a plurality of prefabricated plates 3 are installed between the adjacent two prefabricated piles 2. The width of the prefabricated plate 3 is determined according to the pile spacing, the length and the thickness are determined according to the design requirement, and the bottom of the lowermost end is prefabricated into a blade foot shape, which is convenient for driving into the soil body. The prefabricated plate 3 is inserted through the clamping groove reserved on the side of the prefabricated pile 2, and the prefabricated plate is driven into the soil body by using a vibration hammer or a static pressure equipment, so that the connection between the prefabricated plate and the prefabricated pile is tight, and the plate body and the pile body contact surface has no obvious gap.

[0048] Prefabricated corbel 1 installation: the prefabricated corbel 1 is installed at the upper end of the plurality of prefabricated piles 2 and the prefabricated plates 3. The corbel installation base surface is corrected, and the construction of the plain concrete cushion layer is carried out, so that the grouting material is scattered when the corbel is installed. The round groove or the square groove of the corbel is aligned with the pile top, the long groove is aligned with the plate top, the prefabricated corbel covers the pile top and the plate top from top to bottom, and the groove is tightly combined with the pile top and the plate top.

[0049] Grouting connection: the prefabricated corbel 1 is connected on the prefabricated pile 2 and the prefabricated plate 3 by pouring, so that the three are connected as a whole. The grouting material is scattered, the pores between the corbel and the cushion layer are filled, and the grouting is prevented. The grouting is carried out through the grouting hole reserved on the corbel, the grout is ensured to fill the gap between the corbel and the prefabricated pile and the prefabricated plate, the corbel is closed connected with the same, and the overall supporting structure is formed.

[0050] Anchor assembly construction: as the earthwork is excavated in layers, the anchor rods or cables are driven into the precast pile's reserved holes one by one. The insertion depth, angle, diameter, and exposed length of the anchor rods are determined according to design requirements, and cement slurry is injected into the borehole to ensure that the slurry fills the borehole and wraps the anchor rods or cables. After grouting is completed, it is left to cure.

[0051] Waist beam installation: after the slurry reaches the designed strength, the steel waist beam is installed. The steel waist beam is fixed to the exposed part of the anchor rod or cable, connected by bolts or welding, and the levelness of the steel waist beam and the firmness of the connection with the precast pile are checked.

[0052] The foregoing basic examples and their respective further selected examples can be freely combined to form multiple embodiments, all of which are intended to be employed and claimed by the present application. In the present application, each selected example can be arbitrarily combined with any basic example and selected example.

[0053] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A precast composite retaining structure comprising a number of precast piles (2) inserted into the bottom (6) of a foundation pit, characterized in that: Also include several prefabricated crown beams (1) and prefabricated plates (3), the prefabricated plate (3) is arranged between two adjacent prefabricated piles (2), the lower end of the prefabricated plate (3) is inserted into the foundation pit bottom (6), the upper end of the several prefabricated piles (2) and the several prefabricated plates (3) are connected into one by the prefabricated crown beam (1).

2. The prefabricated modular enclosure according to claim 1, characterized in that: The bottom of the prefabricated crown beam (1) is provided with a beam body plate groove (101) and a beam body pile groove (102), the prefabricated pile (2) is inserted into and poured into the beam body pile groove (102), and the prefabricated plate (3) is inserted into and poured into the beam body plate groove (101).

3. The prefabricated modular enclosure according to claim 2, wherein: The beam body plate groove (101) and the beam body pile groove (102) are communicated, the beam body plate groove (101) is a long groove, and the beam body pile groove (102) is a square groove or a circular groove; the groove depth of the beam body plate groove (101) is less than the groove depth of the beam body pile groove (102).

4. A prefabricated modular enclosure according to claim 2 or 3, characterised in that: The prefabricated crown beam (1) is provided with a grouting hole (104) communicated to the lower end of the beam body plate groove (101) or the beam body pile groove (102), and the prefabricated crown beam (1) is provided with a grout outlet hole (105) communicated to the upper end of the beam body plate groove (101) or the beam body pile groove (102).

5. The prefabricated modular enclosure according to claim 1, wherein: The end of the prefabricated crown beam (1) is provided with a connecting plate (103), and the adjacent two connecting plates (103) are connected through bolts.

6. The prefabricated modular enclosure according to claim 1, wherein: The side of the prefabricated pile (2) is provided with a pile body plate groove (201), and the side of the prefabricated plate (3) is provided with a plate body clamping end (301) clamped in the pile body plate groove (201).

7. The prefabricated modular enclosure according to claim 6, characterized in that: The pile body plate groove (201) and the plate body clamping end (301) are T-shaped structures matched with each other.

8. The prefabricated modular enclosure according to claim 1 or 6, characterized in that: The prefabricated pile (2) is provided with a reserved anchor rod hole (202), and the reserved anchor rod hole (202) is provided with an anchoring assembly anchored into the soil body.

9. The prefabricated modular enclosure according to claim 8, characterized in that: The several anchoring assemblies are connected into one through the waist beam (5).

10. The prefabricated modular enclosure according to claim 1, wherein: The prefabricated plate (3) is divided into at least two layers, and the upper and lower two layers of prefabricated plates (3) are matched and welded and fixed.

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