Construction method of prefabricated combined type enclosure structure

Abstract

The invention discloses a construction method of a prefabricated combined type enclosure structure. The construction method comprises the following steps that prefabricated piles are installed, specifically, a plurality of prefabricated piles arranged at intervals are driven into the bottom of a foundation pit; a plurality of prefabricated plates are installed between every two adjacent prefabricated piles, and the lower ends of the prefabricated plates are inserted into the bottom of the foundation pit; prefabricated crown beams are installed, specifically, the prefabricated crown beams are installed at the upper ends of the multiple prefabricated piles and the prefabricated slabs; and grouting connection is conducted, specifically, the prefabricated top beam is connected to the prefabricated pile and the prefabricated plate in a pouring mode, and the prefabricated top beam, the prefabricated pile and the prefabricated plate are integrally connected. 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 present application belongs to the technical field of foundation pit and slope enclosure of building construction, and specifically relates to a construction method of a prefabricated combined enclosure structure. Background Art

[0002] In the field of construction engineering, projects such as foundation pit support and slope protection have extremely high requirements for the safety, stability and construction efficiency of retaining structures. 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: cast-in-place concrete maintenance structures have a long construction period, difficult quality control, and high environmental pollution; steel sheet piles have high costs, limited applicability and insufficient durability; bored piles have unstable pile quality and a long construction period. In addition, the connection methods of traditional support structures are mostly welding or bolting, which are complex to construct and have limited connection strength.

[0003] In recent years, the application of prefabricated components in engineering has gradually increased, but the existing prefabricated enclosure structures often have problems such as complex connections, poor integrity, and low construction efficiency. In order to solve the above problems, improve construction efficiency, connection strength and overall stability, and reduce environmental pollution and resource waste, a prefabricated modular enclosure structure with convenient construction, reliable connection and strong integrity is urgently needed. Summary of the invention

[0004] Based on the above problems, this application proposes a construction method for a prefabricated modular enclosure structure. Through the prefabrication, modularization, and assembly technology route, the connection method and structural design are optimized, the construction efficiency, connection strength, and overall stability are improved, and the rapid installation, high-strength connection, and overall stability of the foundation pit support structure are achieved to meet the needs of modern engineering construction. At the same time, it provides a replicable and popularizable industrial solution for enclosure engineering, which is in line with the strategic direction of the transformation and upgrading of the construction industry and the goal of energy conservation and carbon reduction.

[0005] The purpose of this application is achieved through the following technical solutions:

[0006] A construction method for a prefabricated combined enclosure structure comprises the following steps:

[0007] Precast pile installation: drive a number of precast piles arranged at intervals into the bottom of the foundation pit;

[0008] Prefabricated panel installation: install several prefabricated panels between two adjacent prefabricated piles, and insert the lower end of the prefabricated panel into the bottom of the foundation pit;

[0009] Prefabricated crown beam installation: Install the prefabricated crown beam on the upper ends of several prefabricated piles and prefabricated panels;

[0010] Grouting connection: The prefabricated cap beam is cast and connected to the prefabricated piles and prefabricated slabs so that the three are connected as one.

[0011] Furthermore, 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 extended into and cast connected in the beam body pile groove, and the prefabricated plate is extended into and cast connected in the beam body plate groove.

[0012] Furthermore, the beam plate groove is communicated with the beam pile groove, the beam plate groove is a long groove, and the beam pile groove is a square groove or a round groove; the groove depth of the beam plate groove is less than the groove depth of the beam pile groove.

[0013] Furthermore, the prefabricated crown beam is provided with a grouting hole connected to the lower end of the beam body plate groove or the beam body pile groove, and the prefabricated crown beam is provided with a grouting hole connected to the upper end of the beam body plate groove or the beam body pile groove.

[0014] Furthermore, the ends of the prefabricated crown beams are provided with connecting plates, and two adjacent connecting plates are connected by bolts.

[0015] Furthermore, the side of the precast pile is provided with a pile body plate groove, and the side of the precast plate is provided with a plate body clamping end clamped in the pile body plate groove.

[0016] Furthermore, the pile plate groove and the plate body clamping end are T-shaped structures that match each other.

[0017] Furthermore, the prefabricated pile is provided with a reserved anchor hole, and an anchoring component anchored into the soil is provided in the reserved anchor hole.

[0018] Furthermore, several anchoring components are connected as a whole through a waist beam.

[0019] Furthermore, the prefabricated panels are divided into at least two layers, the upper and lower layers of prefabricated panels are adhered to each other and fixed by welding.

[0020] Beneficial effects of this application:

[0021] 1. Significantly improved construction efficiency: 1) Factory production of prefabricated components: Prefabricated piles, prefabricated panels, prefabricated crown beams and other components adopt standardized designs with controllable quality, which is convenient for factory mass production and rapid on-site assembly, reducing the complexity and uncertainty of on-site construction; Convenient on-site assembly: Through the design of slideways, grouting holes, etc., rapid assembly of components is achieved, greatly shortening the construction period. 2) Parallel operation: The production of prefabricated components and on-site construction can be carried out simultaneously, further improving the overall construction efficiency. 3) Reduced processes: Since it is a factory-prefabricated structure with high flatness, it can be used as the outer template of the structural wall, reducing the process of installing the outer template support of the wall, improving construction efficiency, and avoiding the backfilling of the fertilizer trough between the main structure and the foundation pit retaining wall, eliminating the quality risk of settlement in the later stage of backfilling of the fertilizer trough.

[0022] 2. Enhanced structural integrity and stability: 1) Tight connection design: The precast piles and precast panels are connected through slides, and the crown beams are connected to the precast piles and precast panels through grooves and grouting, ensuring a 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 beam and the precast piles, further improving the rigidity and durability of the enclosure structure.

[0023] 3. Strong adaptability and wide application range: 1) Applicable to various geological conditions: By adjusting the length, diameter and arrangement of anchor rods or anchor cables of precast piles, it can adapt to different geological conditions and engineering requirements. 2) Applicable to various engineering scenarios: Not only suitable for foundation pit support, but also for slope protection, retaining walls and other projects, with broad application prospects. 3) Flexibility: The modular design of precast components facilitates transportation, storage and installation, which improves the flexibility and convenience of construction. The size of the components can be flexibly adjusted according to engineering requirements to meet the enclosure requirements of different spans and heights.

[0024] 4. Environmental protection and energy saving, in line with the concept of green construction: 1) Reduce on-site pouring: The use of prefabricated components reduces on-site concrete pouring operations, reduces construction noise and dust pollution. 2) High material utilization rate: Factory production can accurately control the amount of materials used, reduce waste, and reduce project costs.

[0025] 5. Controllable construction quality and high safety: 1) Factory prefabrication quality control: Prefabricated components are produced in the factory, which can strictly control the size, strength and appearance quality, reducing quality risks in on-site construction. 2) Standardization of construction process: Through standardized construction technology and processes, the risk of human operation errors is reduced and construction safety is improved.

[0026] 6. Significant social and economic benefits: 1) Reduce labor costs: The assembly of prefabricated components reduces the number of on-site workers and reduces labor costs. 2) Shorten construction period: The improvement of construction efficiency directly shortens the construction period and reduces project management costs and equipment rental costs. 3) Promote industry progress: The use of prefabricated modular enclosure structures promotes the development of the construction industry towards industrialization and standardization, and promotes technological progress and industrial upgrading.

[0027] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application; and in the present application, (non-conflicting options) can also be freely combined with each other and with other options. After understanding the scheme of the present application, those skilled in the art can understand that there are many combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural elevation view of this application.

[0029] Figure 2 It is the structural plan view of this application.

[0030] Figure 3 It is a structural side view (cross-sectional view) of the present application.

[0031] In the figure: 1-precast crown beam, 2-precast pile, 3-precast plate, 5-waist beam, 6-bottom of foundation pit; 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 clamp end. DETAILED DESCRIPTION

[0032] The following non-limiting examples are provided to illustrate the present application.

[0033] Example 1

[0034] refer to Figure 1 to Figure 3 As shown, a construction method of a prefabricated combined enclosure structure includes the following steps: Prefabricated pile 2 installation: a plurality of prefabricated piles 2 arranged at intervals are driven into the bottom of the foundation pit 6. According to the design drawings, the pile positions and pile spacing of the prefabricated piles 2 are measured and laid out, and the prefabricated piles 2 are marked, and the prefabricated piles 2 are driven into the soil at the designed positions, ensuring that the verticality deviation of the pile body does not exceed 1%, and the pile side slots are accurately installed, and the longitudinal centers of the slots are in a straight line.

[0035] Installation of precast panels 3: Install several precast panels 3 between two adjacent precast piles 2. The width of the precast panels 3 is determined according to the pile spacing, and the length and thickness are determined according to the design requirements. The bottom of the lowest end is prefabricated into a blade shape to facilitate driving into the soil. Insert the precast panels 3 through the slots reserved on the side of the precast piles 2, and use a vibrating hammer or static pressure equipment to drive the precast panels into the soil, ensuring that the connection between the precast panels and the precast piles is tight, and there is no obvious gap between the panel body and the pile body.

[0036] Installation of prefabricated crown beam 1: Install the prefabricated crown beam 1 on the upper ends of several prefabricated piles 2 and prefabricated panels 3. Correct the crown beam installation base surface, and construct a plain concrete cushion layer to facilitate the spreading of seat slurry when installing the crown beam. Align the round groove or square groove of the crown beam with the pile top, and the long groove with the panel top. Cover the pile top and panel top from top to bottom with the groove tightly fitting the pile top and panel top.

[0037] Grouting connection: Cast the prefabricated crown beam 1 on the prefabricated pile 2 and the prefabricated board 3 so that the three are connected as one. Spread the grouting material to fill the gap between the crown beam and the cushion layer to prevent leakage. Grout through the grouting holes reserved on the crown beam to ensure that the grout fills the gap between the crown beam and the prefabricated pile and prefabricated board, so that the crown beam is closed and connected with them to form an integral support structure.

[0038] Anchor assembly construction: As the earthwork is excavated layer by layer, anchor rods or anchor cables are driven into the reserved holes of the prefabricated piles one by one. The insertion depth, angle, diameter and exposed length of the anchor rods are determined according to the design requirements, and cement slurry is injected into the borehole to ensure that the slurry fills the borehole and wraps the anchor rods or anchor cables. After the grouting is completed, it is left to stand for curing.

[0039] Installation of waist beam: After the slurry reaches the designed strength, install the steel waist beam, fix the steel waist beam to the exposed part of the anchor rod or anchor cable, connect it with bolts or welding, and check the horizontality of the steel waist beam and the firmness of the connection with the precast piles.

[0040] The prefabricated combined enclosure structure obtained by the construction method comprises a prefabricated crown beam 1, a prefabricated pile 2, a prefabricated plate 3 and a waist beam 5.

[0041] The lower end of the precast pile 2 is inserted into the bottom of the foundation pit 6. The precast pile 2 serves as the supporting body of the enclosure structure. A precast plate 3 is arranged between two adjacent precast piles 2. The lower end of the precast plate 3 is inserted into the bottom of the foundation pit 6. The precast pile 2 and the precast plate 3 together form a complete supporting surface to enclose the soil. The upper ends of the precast piles 2 and several precast plates 3 are connected as a whole by a precast cap beam 1 to improve the integrity and stability of the enclosure structure.

[0042] The precast pile 2 is in a cylindrical structure or a regular quadrangular prism structure. In this case, a regular quadrangular prism structure is adopted. The side length is generally 0.6-1.0m. A high-strength prestressed reinforced concrete pile is adopted. Reinforcement ribs are arranged inside the pile to improve the bending and shearing resistance of the pile body.

[0043] The side of the precast pile 2 is provided with a pile body plate groove 201, and the side of the precast plate 3 is provided with a plate body clamping end 301 clamped in the pile body plate groove 201, so as to realize the clamping connection between the precast pile 2 and the precast plate 3. The pile body plate groove 201 and the plate body clamping end 301 are T-shaped structures that match each other, which is convenient for the insertion and fixation of the precast plate 3, and the length of the pile body plate groove 201 is consistent with the height of the precast plate 3.

[0044] The precast pile 2 is provided with a reserved anchor hole 202, and a casing is pre-buried in the hole to facilitate the subsequent installation and grouting of anchor rods or anchor cables. An anchor component anchored in the soil is provided in the reserved anchor hole 202. The anchor component acts on the precast pile 2 to improve the support strength and stability of the precast pile 2.

[0045] The anchor rod is made of high-strength threaded steel, and the anchor cable is made of 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 driven into the reserved guide hole of the prefabricated pile. The insertion depth, angle, diameter and length of the exposed part of the anchor rod are determined according to the design requirements, and cement slurry is injected into the borehole to ensure that the slurry fills the borehole and wraps the anchor rod or anchor cable to enhance the anchoring force and prevent rust.

[0046] Subsequently, a steel waist beam is constructed. The waist beam is made of H-shaped steel or I-shaped steel. The cross-sectional size is determined according to the design load. The waist beam is connected to anchor rods or cables by bolts or welding. Several anchor components are connected as a whole through the waist beam 5 to form an overall force system, thereby enhancing the tensile and shear resistance of the support structure.

[0047] The precast plate 3 is a reinforced concrete plate, which is a retaining member between piles of the enclosure structure. The plate thickness is generally 10-15 cm, and the plate thickness can also be adjusted according to design calculations or test data. The plate body is driven into the soil between the two piles along the pile plate groove reserved by the precast pile, forming an integral connection with the pile body to form a pile-plate composite structure. Sensors can be embedded in the plate body to monitor the deformation and stress state of the enclosure structure.

[0048] The prefabricated plate 3 is divided into at least two layers, the upper and lower layers of the prefabricated plates 3 are attached to each other and welded and fixed. The prefabricated plate 3 can be constructed in blocks according to actual needs, and the two plates are welded to form a whole.

[0049] The length of the prefabricated crown beam 1 is generally four to five piles, and the prefabricated reinforced concrete structure is adopted. The longitudinal main reinforcement and stirrups are arranged inside the crown beam to ensure the bending and shearing performance. The prefabricated crown beam 1 is a rectangular structure as a whole. The bottom of the crown beam is provided with a beam body pile groove 102 matching the outer diameter of the pile top according to the pile spacing, 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 plate thickness, so as to facilitate installation.

[0050] The beam plate groove 101 is connected with the beam pile groove 102, matching the continuous connection between the pile body and the plate body. The beam plate groove 101 is a long groove, and the beam pile groove 102 is a square groove or a round groove. The precast pile 2 is extended and cast in the beam pile groove 102, and the precast plate 3 is extended and cast in the beam plate groove 101. The surface of the part of the pile top anchored into the crown beam is prefabricated into a rough surface to facilitate better connection with the crown beam structure after grouting. The groove depth of the beam plate groove 101 is less than the groove depth of the beam pile groove 102 to enhance the connection strength between the pile body and the beam body.

[0051] The prefabricated crown beam 1 is provided with a grouting hole 104 connected 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 grouting hole 105 connected to the upper end of the beam body plate groove 101 or the beam body pile groove 102. A plurality of grouting holes and grouting holes are reserved on the side of the crown beam, and the crown beam is cast and closed with the prefabricated piles and prefabricated panels through grouting.

[0052] The end of the prefabricated crown beam 1 is fixed with a connecting plate 103, which is pre-buried in advance or subsequently welded to the crown beam. Two adjacent connecting plates 103 are connected by bolts, and high-strength bolts are used to connect the prefabricated sections of the crown beam to achieve overall force on the crown beam.

[0053] The precast piles and precast panels are spliced ​​and connected through the slots, and the crown beam is initially connected to the precast piles and precast panels through the groove structure. Subsequently, high-strength slurry is injected through the grouting holes to tightly combine the crown beam with them. As the earthwork is excavated, anchor rods or anchor cables form a pile-anchor system through the reserved guide holes, and the final structure forms an integral support structure of the pile-anchor panel.

[0054] The aforementioned basic examples and their further selected examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection in this application. In the scheme of this application, each selected example can be arbitrarily combined with any other basic examples and selected examples.

[0055] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A construction method for a prefabricated modular enclosure structure, characterized in that: The steps include: Installation of precast piles (2): driving a number of precast piles (2) arranged at intervals into the bottom of the foundation pit (6); Installation of prefabricated panels (3): installing a plurality of prefabricated panels (3) between two adjacent prefabricated piles (2), with the lower end of the prefabricated panel (3) inserted into the bottom of the foundation pit (6); Installation of the prefabricated crown beam (1): installing the prefabricated crown beam (1) on the upper ends of a plurality of prefabricated piles (2) and prefabricated panels (3); Grouting connection: The prefabricated cap beam (1) is cast and connected to the prefabricated pile (2) and the prefabricated plate (3), so that the three are connected as one.

2. The construction method of the prefabricated modular enclosure structure according to claim 1 is 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 extended into and cast-connected in the beam body pile groove (102), and the prefabricated plate (3) is extended into and cast-connected in the beam body plate groove (101).

3. The construction method of the prefabricated modular enclosure structure according to claim 2 is characterized in that: The beam plate groove (101) is communicated with the beam pile groove (102); the beam plate groove (101) is a long groove, and the beam pile groove (102) is a square groove or a round groove; the groove depth of the beam plate groove (101) is less than the groove depth of the beam pile groove (102).

4. The construction method of the prefabricated combined enclosure structure according to claim 2 or 3, characterized in that: The prefabricated crown beam (1) is provided with a grouting hole (104) connected 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 grouting hole (105) connected to the upper end of the beam body plate groove (101) or the beam body pile groove (102).

5. The construction method of the prefabricated modular enclosure structure according to claim 1 is characterized in that: The end of the prefabricated crown beam (1) is provided with a connecting plate (103), and two adjacent connecting plates (103) are connected by bolts.

6. The construction method of the prefabricated modular enclosure structure according to claim 1 is characterized in that: 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 construction method of the prefabricated modular enclosure structure according to claim 6 is characterized in that: The pile body plate groove (201) and the plate body clamping end (301) are T-shaped structures that match each other.

8. The construction method of the prefabricated combined enclosure structure according to claim 1 or 6, characterized in that: The prefabricated pile (2) is provided with a reserved anchor hole (202), and an anchoring component anchored into the soil is provided in the reserved anchor hole (202).

9. The construction method of the prefabricated modular enclosure structure according to claim 8 is characterized in that: A plurality of anchoring components are connected as a whole via a waist beam (5).

10. The construction method of the prefabricated modular enclosure structure according to claim 1, characterized in that: The prefabricated plate (3) is divided into at least two layers, an upper layer and a lower layer, and the upper layer and the lower layer of prefabricated plates (3) are attached to each other and fixed by welding.

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