Novel double-rib-plate fabricated retaining wall and construction method

Abstract

The invention discloses a novel double-rib-plate fabricated retaining wall, and belongs to the technical field of buildings. According to the retaining wall, the double-rib-plate structural design is adopted, the bending resistance and the shearing resistance of the wall body are effectively enhanced, and the problem that an original wall body is insufficient in supporting strength is solved. Two symmetrically-distributed grooves are formed in the back face of the retaining wall panel, a front-section side rib plate is installed in each groove, and the end, away from the corresponding groove, of each front-section side rib plate is connected with a rear-section side rib plate. The panel, the front-section side rib plate and the rear-section side rib plate are all pre-embedded with prestressed ducts and are connected in a tensioning manner through steel strands, anchor bearing plates and clamping pieces; the front-section side rib plate and the rear-section side rib plate are in reinforced connection through a screw rod; the corresponding positions of the front-section side rib plate and the rear-section side rib plate are provided with opening limiting structures, and the upper retaining wall and the lower retaining wall are prevented from horizontally sliding through steel bars penetrating into the limiting structures. The device can be arranged in a multi-unit side-by-side mode or a multi-layer stack mode, and has the advantages of being light and handy in structure, convenient to construct and capable of saving investment.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a novel double-ribbed prefabricated retaining wall and its construction method. Background Technology

[0002] With the rapid development of infrastructure construction in my country, the demand for retaining structure engineering continues to grow, and its safety, economy, and ease of construction have become key concerns in the engineering field. Retaining walls, as crucial structures in highway, railway, water conservancy, and municipal engineering projects, play an irreplaceable role in resisting earth pressure and maintaining slope and structural stability. Currently, traditional retaining wall structures such as gravity retaining walls, cantilever retaining walls, buttress retaining walls, and pile-slab retaining walls are widely used in engineering practice, and their mechanical properties, applicable conditions, and technical limitations are relatively well-defined.

[0003] Gravity retaining walls have long dominated engineering practice due to their advantages such as readily available materials, simple construction, and good economic efficiency. However, these structures also have inherent drawbacks, including large material consumption, heavy structural weight, high foundation requirements, and susceptibility to settlement and cracking in the later stages, making them unsuitable for the higher demands of modern engineering for resource conservation, rapid construction, and long-term performance. Against this backdrop, new retaining wall structures that combine lightweight, high degree of prefabrication, and good durability are receiving increasing attention. Based on the existing technical accumulation of prefabricated retaining walls, this study proposes a novel double-ribbed prefabricated retaining wall and its supporting construction method. Summary of the Invention

[0004] To address the problems of complex construction processes and insufficient support performance of prefabricated structures in current retaining wall structures, this invention proposes a novel double-ribbed prefabricated retaining wall and its construction method. This technical solution has the following innovative features: (1) Innovative structural design: The unique “π” type structural system is adopted, and the front and rear side ribs and panels work together to bear the force, giving full play to the structural advantages of gravity and cantilever retaining walls, and significantly improving the overall support performance and deformation resistance. (2) Construction technology innovation: The construction process is fully prefabricated and assembled, which greatly reduces on-site operations and manpower input. Through modular design, the types of main components are controlled to within three, which improves construction efficiency and shortens the construction period; (3) Comprehensive performance advantages: This retaining wall structure has a higher stability coefficient, significantly reducing the requirements for foundation bearing capacity. Reliable connections are achieved between components through prestressed steel strands, high-strength bolts, and limiting structures, improving overall stiffness and seismic performance, and supporting multi-level safe assembly. This invention effectively solves the problem of balancing the supporting performance and construction efficiency of prefabricated retaining walls by combining standardized factory prefabrication with on-site assembly construction.

[0005] This invention effectively overcomes the problems of traditional retaining wall structures, such as heavy weight, low construction efficiency, and insufficient supporting performance, by combining standardized prefabrication in factories with on-site assembly construction. This structure is particularly suitable for highway, railway, municipal, and other important infrastructure construction projects with stringent engineering standards.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A novel double-ribbed prefabricated retaining wall includes a panel, characterized in that: the back of the panel has two symmetrically arranged grooves, each groove housing a front side rib, and the end of the front side rib facing away from the groove is connected to a rear side rib; the outer wall of the panel has protrusions at positions corresponding to the grooves; the panel, front side ribs, and rear side ribs are connected by prestressed steel strands and bolts to jointly form the double-ribbed prefabricated retaining wall. This structure significantly improves the bending and shear resistance of the wall, effectively solving the problem of insufficient support strength in traditional walls.

[0007] As a further embodiment of the present invention, the panel, the front side rib, and the rear side rib are all provided with interconnected prestressed ducts; the boss and the rear side rib are all provided with slots on the outside, and anchor plates are pre-embedded in the slots; the sides of the front side rib and the rear side rib are provided with connecting holes; the panel, the front side rib, and the rear side rib are connected by prestressed steel strands passing through the prestressed ducts, and are anchored by pre-embedded anchor plates and clamps; the front side rib and the rear side rib are reinforced by screws passing through the connecting holes, and are assembled together into a "π" shaped unit structure, and multiple such structures can be arranged side by side to form a retaining wall as a whole.

[0008] As a further embodiment of the present invention, both sides of the outer walls of the front side rib and the rear side rib are provided with opening limiting structures.

[0009] As a further embodiment of the present invention, the panel is provided with a plurality of drainage holes at intervals.

[0010] A construction method for a novel double-ribbed prefabricated retaining wall includes the following steps: Step 1: Clean up the construction site, level and compact the foundation ground to ensure that the bearing capacity of the foundation meets the design standards; conduct surveying and layout according to the design drawings, and verify the results by combining the longitudinal axis and cross section of the foundation to accurately mark the installation position and control elevation of the retaining wall; at the same time, implement surface drainage measures and reserve sufficient working space for subsequent construction.

[0011] Step 2: In the factory, adopt standardized assembly line production process to prefabricate reinforced concrete panels, front side ribs and rear side ribs, ensuring that the concrete strength grade is not lower than C30.

[0012] Step 3: During the transportation, hoisting and on-site assembly of the panel, front side rib, and rear side rib, effective protective measures must be taken to prevent damage to the edges and flanges of the components.

[0013] Step 4: During on-site assembly, first, hoist the panels into position according to the design and temporarily fix them. Then, hoist the front and rear side ribs in sequence to ensure that all components accurately form a "π" shaped structure. Insert the front side ribs into the pre-reserved grooves in the panels, ensuring a complete seal at the socket joints. Next, thread the prestressed steel strands into the prestressing ducts and anchor them at the groove openings using pre-embedded anchor plates and wedges. Use hydraulic jacks to tension the strands in stages to the design control stress value. After tensioning, cut off any excess exposed steel strands. Then, check the patency of the grouting ducts and grout through the grouting holes on the anchor plates. After the grout outlets of the pre-embedded anchor plates in the grooves of the rear side ribs discharge cement grout of the same consistency, seal the outlets and maintain a stable pressure for 2-3 minutes before stopping grouting. After grouting, seal the grooves with cement mortar. Finally, connect the side ribs using high-strength bolts specified in the design. The number of bolts is determined based on the earth pressure borne by the panels and tightened according to the design torque requirements.

[0014] Step 5: Backfill the wall in layers. Each layer should not exceed 30cm in thickness. Improved soil or well-graded coarse-grained soil is recommended. During backfilling, a filter layer should be laid on the inside of the panel according to design requirements, ensuring its thickness and permeability meet specifications. The backfill soil should be spread in layers and compacted using a small vibratory roller. Both sides of the side panels should be compacted symmetrically to ensure uniform stress. Small rammers or handheld impact rammers should be used to supplement compaction at corners to ensure the compaction meets design requirements. During compaction, machinery should maintain a safe distance from the wall, and collisions with structural components are strictly prohibited.

[0015] Step Six: For large-area fill areas, a multi-unit parallel arrangement can be adopted; for high fill conditions, a multi-level stacked arrangement is recommended. During the hoisting of each retaining wall, it should be connected by steel bars inserted into the limiting structure to effectively prevent lateral slippage of the upper retaining wall during the filling process. The technical requirements for backfilling behind the wall are the same as for single-level retaining walls; specific operations should be performed according to the aforementioned steps.

[0016] The beneficial effects of this invention are as follows: The retaining wall structure provided by this invention exhibits good adaptability and scalability: for large-area fill conditions, multiple units can be arranged in parallel; under high earth pressure, the structural lateral pressure bearing capacity can be enhanced by increasing the number of rear side ribs; for high fill scenarios, multi-layer stacked graded assembly is supported, and steel bars are inserted into the corresponding upper and lower limiting structural holes for connection, thereby ensuring the overall stability and safety of the retaining wall under a fully prefabricated construction method. Attached Figure Description

[0017] Figure 1 This is a first three-dimensional structural schematic diagram of a novel double-ribbed prefabricated retaining wall proposed in this invention. Figure 2 This is a schematic diagram of the second three-dimensional structure of a novel double-ribbed prefabricated retaining wall proposed in this invention. Figure 3 This is a schematic diagram of the third three-dimensional structure of a novel double-ribbed prefabricated retaining wall proposed in this invention. Figure 4 This is a schematic diagram of the three-dimensional structure of the panel of a novel double-ribbed prefabricated retaining wall proposed in this invention. Figure 5 This is a three-dimensional structural diagram of the front side rib of a novel double-rib prefabricated retaining wall proposed in this invention. Figure 6 This is a three-dimensional structural diagram of the rear side rib of a novel double-rib prefabricated retaining wall proposed in this invention. Figure 7 This is a partial cross-sectional three-dimensional structural diagram of a novel double-ribbed prefabricated retaining wall proposed in this invention.

[0018] In the diagram: 1. Panel; 2. Front side rib; 3. Rear side rib; 4. Connecting hole; 5. Groove; 6. Boss; 7. Prestressed duct; 8. Slot; 9. Anchor plate; 10. Limiting structure; 11. Drainage hole; Detailed Implementation

[0019] The relevant technical solutions will now be clearly and completely described with reference to the accompanying drawings of the embodiments of the present invention. It should be understood that the embodiments described below are only some representative implementations of the present invention, and not all possible implementations.

[0020] It should be noted that, provided there are no conflicts, the various embodiments and their technical features described in this application can be combined with each other. The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 7 As shown, this invention provides a novel double-ribbed prefabricated retaining wall, mainly comprising a panel 1. The back of the panel 1 has two symmetrically arranged grooves 5, each groove 5 housing a front side rib 2. The end of the front side rib 2 furthest from the groove 5 is connected to a rear side rib 3. A boss 6 is also provided on the outer wall of the panel 1 at a position corresponding to the groove 5.

[0022] In this embodiment, the panel 1, the front side rib 2, and the rear side rib 3 are all provided with interconnected prestressed ducts 7. The boss 6 and the rear part of the rear side rib 3 are both provided with slots 8, and the sides of the front side rib 2 and the rear side rib 3 are provided with connecting holes 4. The panel 1, the front side rib 2, and the rear side rib 3 are connected by prestressed tendons, anchor plates 9, clamps, and high-strength bolts to form a "π"-shaped unit structure. This structural unit can be arranged side-by-side along the extension direction of the retaining wall.

[0023] In this embodiment, both sides of the outer walls of the front side rib plate 2 and the rear side rib plate 3 are provided with opening limiting structures 10.

[0024] In this embodiment, a plurality of drainage holes 11 are provided at intervals on the panel 1.

[0025] A construction method for a novel double-ribbed prefabricated retaining wall includes the following steps: Step 1: Clean up the construction site, level and compact the foundation ground to ensure that the bearing capacity of the foundation meets the design standards; conduct surveying and layout according to the design drawings, and verify the results by combining the longitudinal axis and cross section of the foundation to accurately mark the installation position and control elevation of the retaining wall; at the same time, implement surface drainage measures and reserve sufficient working space for subsequent construction.

[0026] Step 2: In the factory, adopt standardized assembly line production process to prefabricate reinforced concrete panel 1, front side rib 2 and rear side rib 3, ensuring that the concrete strength grade is not lower than C30.

[0027] Step 3: During the transportation, hoisting and on-site assembly of panel 1, front side rib 2 and rear side rib 3, effective protective measures must be taken to prevent damage to the edges and flanges of the components.

[0028] Step 4: During on-site assembly, first, hoist panel 1 into position according to the design and temporarily fix it. Then, hoist the front side rib 2 and the rear side rib 3 in sequence to ensure that all components accurately form a "π" shaped structure. Insert the front side rib 2 into the groove 5 reserved in panel 1, ensuring that the socket joint is completely sealed. Then, thread the prestressed steel strands into the prestressed ducts 7, and anchor them at the groove opening 8 through the pre-embedded anchor plates 9 and wedges. Use hydraulic jacks to tension the strands in stages to the design control stress value. After tensioning, cut off any exposed excess steel strands. Next, check the patency of the grouting ducts and grout through the grouting holes on the anchor plates 9. After the grout outlet of the pre-embedded anchor plate in the groove opening 8 of the rear side rib 3 discharges cement grout of the same consistency, seal the outlet and maintain a stable pressure for 2-3 minutes before stopping grouting. After grouting, seal the groove opening 8 with cement mortar. Finally, high-strength bolts as specified in the design are used to connect the side ribs. The number of bolts is determined based on the earth pressure borne by panel 1 and is tightened according to the design torque requirements.

[0029] Step 5: Backfill the wall in layers. Each layer should not exceed 30cm in thickness. Improved soil or well-graded coarse-grained soil is recommended. During backfilling, a filter layer should be laid on the inside of the panel according to design requirements, ensuring its thickness and permeability meet specifications. The backfill soil should be spread in layers and compacted using a small vibratory roller. Both sides of the side panels should be compacted symmetrically to ensure uniform stress. Small rammers or handheld impact rammers should be used to supplement compaction at corners to ensure the compaction meets design requirements. During compaction, machinery should maintain a safe distance from the wall, and collisions with structural components are strictly prohibited.

[0030] Step 6: When the area of ​​the backfill is large, multiple units can be arranged side by side. If the earth pressure is large, the number of the rear side ribs 3 can be increased to enhance the resistance to lateral pressure. When the backfill height is high, a multi-layer stacked graded arrangement can be adopted, and a reliable connection can be achieved by inserting steel bars into the upper and lower aligned opening limiting structure 10. The construction method is the same as that of a single-stage retaining wall. For specific operations, please refer to the previous text. It will not be repeated here.

[0031] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A novel double-ribbed prefabricated retaining wall, comprising a panel (1), characterized in that: The back of the panel (1) is provided with two symmetrically arranged grooves (5), and a front side rib plate (2) is installed in each groove (5). The end of the front side rib plate (2) facing away from the groove (5) is connected to a rear side rib plate (3). The outer wall of the panel (1) is provided with a boss (6) at the position corresponding to the groove (5). The panel (1), the front side rib plate (2) and the rear side rib plate (3) are connected to the screw through prestressed steel strands to form a double-rib plate prefabricated retaining wall.

2. The novel double-ribbed prefabricated retaining wall according to claim 1, characterized in that: The panel (1), the front side rib (2) and the rear side rib (3) are all provided with interconnected prestressed ducts (7); the boss (6) and the rear side rib (3) are all provided with slots (8), and anchor plates (9) are pre-embedded in the slots (8); the sides of the front side rib (2) and the rear side rib (3) are provided with connecting holes (4); the panel (1), the front side rib (2) and the rear side rib (3) are connected by prestressed steel strands passing through the prestressed ducts (7), and are anchored by the pre-embedded anchor plates (9) and clamps; the front side rib (2) and the rear side rib (3) are reinforced by screws passing through the connecting holes (4), and are assembled together into a "π" shaped unit structure. Multiple such structures can be arranged side by side to form a retaining wall as a whole.

3. A novel double-ribbed prefabricated retaining wall according to claim 2, characterized in that: Both the front side rib (2) and the rear side rib (3) are provided with opening limiting structures (10) on their outer walls.

4. A novel double-ribbed prefabricated retaining wall according to claim 1, characterized in that: The panel (1) is provided with a plurality of drainage holes (11) spaced apart.

5. A construction method for a novel double-ribbed prefabricated retaining wall, characterized in that, Includes the following steps: Step 1: Site preparation and measurement positioning: Clean the construction site, level and compact the foundation ground to ensure that the bearing capacity of the foundation meets the design standards; conduct measurement and layout according to the design drawings, and verify the results by combining the longitudinal axis and cross section of the foundation to accurately mark the installation position and control elevation of the retaining wall; at the same time, do a good job of surface drainage and reserve sufficient working space for subsequent construction. Step 2, component prefabrication: In the factory, a standardized assembly line production process is used to prefabricate the reinforced concrete panel (1), the front side rib plate (2) and the rear side rib plate (3), ensuring that the concrete strength grade is not lower than C30; Step 3, Component Transportation and Installation Protection: During the transportation, hoisting and on-site assembly of the panel (1), front side rib (2) and rear side rib (3), effective protective measures must be taken to prevent damage to the edges and flanges of the components; Step 4: On-site assembly and prestressing construction: First, hoist the panel (1) into place according to the design position and temporarily fix it. Then, hoist the front side rib plate (2) and the rear side rib plate (3) in sequence to make each component accurately form a "π" shaped structure. Insert the front side rib plate (2) into the groove (5) reserved in the panel (1) to ensure that the socket joint is completely sealed. Then, thread the prestressed steel strands into the prestressed duct (7) and anchor them at the groove opening (8) through the pre-embedded anchor plate (9) and wedge. Use hydraulic jacks to tension in stages to the design control stress. After tensioning, cut off the exposed excess steel strands, then check the grouting channel for unobstructed flow, and grout through the grouting hole on the anchor plate (9). After the grout outlet hole of the anchor plate embedded in the groove (8) of the rear side rib plate (3) discharges cement slurry of the same consistency, seal the grout outlet hole, maintain the pressure for 2-3 minutes and then stop grouting. After grouting, seal the groove (8) with cement mortar. Finally, use the high-strength bolts specified in the design to connect each side rib plate. The number of bolts is determined by the earth pressure borne by the panel (1) and is tightened according to the design torque requirements. Step 5, Backfilling behind the wall: Backfill the wall in layers. The thickness of each layer should not exceed 30cm. Improved soil or well-graded coarse-grained soil should be selected as filler. When backfilling, a filter layer should be laid on the inner side of the panel (1) according to the design requirements to ensure that its thickness and permeability meet the specifications. The backfill soil should be spread in layers and compacted. A small vibratory roller should be used for compaction. The two sides of the side plate should be compacted synchronously and symmetrically to ensure uniform force. Small rammers or hand-held impact rammers should be used to compact the corners to ensure that the compaction meets the design requirements. When compacting, the machinery should keep a safe distance from the wall and it is strictly forbidden to collide with structural components. Step 6: For large-area fill areas, a multi-unit parallel arrangement can be adopted; for high fill conditions, a multi-level stacked arrangement scheme should be adopted. When each retaining wall is hoisted, it should be connected by steel bars inserted into the limiting structure (10) to effectively prevent the upper retaining wall from lateral sliding during the filling process. The backfill construction technical requirements are the same as those for single-level retaining walls. The specific operation is carried out in accordance with the aforementioned steps.

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