A shock-absorbing and energy-absorbing reinforced earth retaining wall and its assembly construction method

Abstract

The present invention discloses a shock-absorbing and energy-absorbing reinforced earth retaining wall and an assembled construction method thereof. The reinforced earth retaining wall comprises a foam concrete wall and a multi-layer flexible retaining wall structure. The multi-layer flexible retaining wall structure is stacked up and down on the top of the foam concrete wall. The flexible retaining wall structure comprises a prefabricated panel, a metal mesh reinforcement layer and a metal mesh reverse wrapping layer. The upper and lower ends of the prefabricated panel are respectively provided with rotating shafts. The metal mesh reinforcement layer is connected to the rotating shaft at the lower end of the prefabricated panel. The metal mesh reverse wrapping layer is connected to the rotating shaft at the upper end of the prefabricated panel. A plurality of energy-absorbing support tripods are provided between the metal mesh reinforcement layer and the prefabricated panel. The present invention assumes the main earthquake resistance by providing two auxiliary structures, an energy-absorbing support tripod and an energy-absorbing connector, which can play a good protective role on the main structure of the retaining wall. The reinforced earth retaining wall of the present invention can be assembled and constructed, which greatly shortens the construction period of the retaining wall and expands the application scope of the reinforced earth retaining wall.

Description

Technical Field

[0001] The invention relates to the field of geotechnical engineering, and in particular to a shock-absorbing and energy-absorbing reinforced earth retaining wall and an assembly construction method thereof. Background Art

[0002] Reinforced earth retaining walls are widely used in infrastructure construction such as roads and railways due to their economic, environmental and seismic performance advantages. At present, the seismic resistance of reinforced earth retaining walls is mainly borne by the main retaining wall structures such as geogrids and flexible retaining walls. Once the reinforced earth retaining wall is damaged by an earthquake, it often causes the retaining wall to no longer perform its normal retaining function.

[0003] In view of the existence of the above problems, many people in the industry have begun to study the structure of earth retaining walls. For example, the invention patent with patent number ZL201910322650.0 discloses a shock-absorbing panel assembled reinforced earth retaining wall and its construction method. The reinforced earth retaining wall includes a retaining wall body and a backfill body; the retaining wall body is arranged at the front end of the slope, and the backfill body is arranged between the retaining wall body and the slope; the retaining wall body includes an assembled foundation layer, a bottom panel layer, a hard support layer, a lower transition panel layer, a shock-absorbing and energy-dissipating layer, an upper transition panel layer and a top panel layer arranged in sequence from bottom to top. The backfill body includes a filter layer, geosynthetics, geotechnical fillers in the reinforced area and soil filling in the non-reinforced area. This technology is assembled with a variety of panels and assembled foundations, and is connected and fixed with reserved grooves and protrusions and non-horizontal structures. The use of shock-absorbing and energy-dissipating panels can avoid damage such as the fall-off of the reinforced earth retaining wall panels and the pull-out of the reinforcement materials under earthquake conditions. However, the seismic resistance of the reinforced earth retaining wall of this structure needs to be further improved. Summary of the invention

[0004] The purpose of the present invention is to provide a shock-absorbing and energy-absorbing reinforced earth retaining wall to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides a shock-absorbing and energy-absorbing reinforced earth retaining wall, comprising a foam concrete wall and a multi-layer flexible retaining wall structure, wherein the foam concrete wall is arranged at the foot of the slope, and the multi-layer flexible retaining wall structures are stacked up and down on the top of the foam concrete wall, and each layer of the flexible retaining wall structure comprises a prefabricated panel, a metal mesh reinforcement layer and a metal mesh reverse wrapping layer, and the prefabricated panel is inclined from bottom to top toward the slope, and the upper and lower ends of the prefabricated panel are respectively provided with rotating shafts, one end of the metal mesh reinforcement layer is connected to the rotating shaft located at the lower end of the prefabricated panel, and one end of the metal mesh reverse wrapping layer is connected to the rotating shaft located at the upper end of the prefabricated panel, and a plurality of energy-absorbing support tripods are arranged between the metal mesh reinforcement layer and the prefabricated panel; the flexible retaining wall structure located at the bottom layer is connected to the top surface of the foam concrete wall.

[0006] Furthermore, the foam concrete wall comprises a plurality of gabion cages stacked up and down in a stepped distribution, the inner and outer sides of each layer of the gabion cages are respectively filled with crushed stone materials, and the space between the crushed stone materials on both sides is filled with foam concrete.

[0007] Furthermore, two adjacent prefabricated panels in each layer of the flexible retaining wall structure and two adjacent metal mesh reinforcement layers are connected via energy-absorbing connectors; the prefabricated panels are double-twisted hexagonal metal mesh panels.

[0008] Furthermore, the rotating shaft includes a first rotating shaft body and two second rotating shaft bodies which are arranged parallel and symmetrically on both sides of the first rotating shaft body, and the first rotating shaft body and the two second rotating shaft bodies are connected by a plurality of connecting pins.

[0009] Furthermore, the first rotating shaft body is a round rod, and the second rotating shaft body is a semi-round rod; a plurality of connecting holes are provided on the first rotating shaft body and the second rotating shaft body, and a plurality of connecting pins pass through the plurality of connecting holes respectively.

[0010] Furthermore, the energy-absorbing support tripod includes a first side frame, a second side frame and a support rod, one end of the first side frame is provided with a hinge seat, and one end of the second side frame is provided with a hinge shaft hingedly connected to the hinge seat; the first side frame and the second side frame are provided with friction grooves on the opposite sides, and shock-absorbing springs are installed in the friction grooves; a leaf spring assembly and a damper are provided in the support rod, and friction blocks are respectively installed at both ends, and the two friction blocks are respectively inserted in the two friction grooves.

[0011] Furthermore, the friction slide grooves are three linear slide grooves arranged along the length direction of the side frame; a shock-absorbing spring is arranged in each of the linear slide grooves and at one end away from the hinged part.

[0012] The present invention also provides an assembly construction method for a shock-absorbing and energy-absorbing reinforced earth retaining wall, comprising the following steps:

[0013] Step 1: Assemble foam concrete wall blocks: According to the geological conditions on site, lay the foam concrete wall at the foot of the slope to a suitable height;

[0014] Step 2: Fill soil layers between the foam concrete wall blocks and the slope from bottom to top, and compact the soil layers. The thickness of each compacted soil layer is 0.3 to 0.6 m, and the compaction degree of the fill is greater than 95%;

[0015] Step 3, firstly place the rotating shaft on the foam concrete wall block, and adjust the rotating shaft to the designed angle according to the design requirements, then install one end of the metal mesh reinforcement layer on the rotating shaft, and then install the lower end of the prefabricated panel on the rotating shaft; the prefabricated panel and the metal mesh reinforcement layer are respectively connected to the two second rotating shaft bodies inserted in the rotating shaft through connecting pins;

[0016] Step 4: installing a plurality of energy-absorbing support tripods between the prefabricated panel and the metal mesh reinforcement layer, and tying the plurality of energy-absorbing support tripods to the prefabricated panel and the metal mesh reinforcement layer respectively;

[0017] Step 5: Fill soil layers between the prefabricated panel and the slope in layers, and also compact the soil layers. The thickness of each compacted soil layer is 0.3 to 0.6 m, and the compaction degree of the fill is greater than 95%;

[0018] Step 6: first install a rotating shaft on the upper end of the prefabricated panel, and then install one end of the metal mesh reverse wrapping layer on the rotating shaft to form a flexible retaining wall structure;

[0019] Step 7, repeating steps 3 to 6 on the formed flexible retaining wall structure until the reinforced retaining wall reaches the designed height of the fill slope;

[0020] Step 8, spraying grass seeds in the prefabricated panel to form a soil-fixing effect through plant roots;

[0021] Step 9: Set up intercepting ditches on the top of the slope and on the platform to drain the slope.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The shock-absorbing and energy-absorbing reinforced earth retaining wall of the present invention is provided with foam concrete wall blocks, energy-absorbing support tripods and energy-absorbing connectors. The two auxiliary structures of the energy-absorbing support tripods and energy-absorbing connectors bear the main earthquake resistance and can play a good protective role on the main structure of the retaining wall. The present invention can achieve multi-directional and multi-level shock-absorbing and energy-absorbing effects, which can make the reinforced earth structure applicable to a wider range of site conditions. At the same time, the reinforced earth retaining wall structure of the present invention can be assembled for construction, which greatly shortens the construction period of the retaining wall and expands the application scope of the reinforced earth retaining wall, and is particularly suitable for some temporary emergency slope support projects.

[0024] (2) The assembly construction method of the shock-absorbing and energy-absorbing reinforced earth retaining wall of the present invention has a high degree of assembly in the entire construction process, which can greatly shorten the construction period of the reinforced earth retaining wall.

[0025] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of a shock-absorbing and energy-absorbing reinforced earth retaining wall in the present invention;

[0028] Figure 2 It is a structural schematic diagram of the rotating shaft in the present invention;

[0029] Figure 3 It is a schematic diagram of the structure of the connecting pin in the present invention;

[0030] Figure 4 It is a schematic diagram of the energy dissipation support tripod in the present invention;

[0031] Among them, 1-foam concrete wall, 2-prefabricated panel, 3-metal mesh reinforcement layer, 4-metal mesh anti-wrapping layer, 5-rotating shaft, 5.1-first rotating shaft body, 5.2-second rotating shaft body, 5.3-connecting pin, 6-energy-absorbing support tripod, 6.1-first side frame, 6.1a-hinge seat, 6.2-second side frame, 6.2a-hinge shaft, 6.3-support rod, 6.4-shock-absorbing spring, 6a-friction slide. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be defined and covered by various different implementations according to the claims.

[0033] See also Figure 1 This embodiment provides a shock-absorbing and energy-absorbing reinforced earth retaining wall, including a foam concrete wall 1 and a multi-layer flexible retaining wall structure, the specific structure of which is as follows:

[0034] The foam concrete wall 1 is arranged at the foot of the slope. During the design, multiple layers can be used according to the geological conditions of the site and the design height of the slope, which can effectively support the foot of the slope and ensure the stability of the slope. Specifically, the foam concrete wall 1 includes a plurality of gabion stone cages stacked up and down in a stepped distribution. The inside and outside of each layer of gabion stone cages (the side close to the slope is the inside, and the side away from the slope is the outside) are filled with crushed stone materials respectively, and the space between the crushed stone materials on both sides is filled with foam concrete. Foam concrete is a lightweight and porous concrete material with excellent deformation and buffering energy absorption characteristics, which can play a shock-absorbing role in the direction perpendicular to the wall.

[0035] The multi-layer flexible retaining wall structure is stacked up and down on the top of the foam concrete wall 1. For the convenience of description, Figure 1 Two layers of flexible retaining wall structures are shown, each layer of the flexible retaining wall structure includes a prefabricated panel 2, a metal mesh reinforcement layer 3 and a metal mesh reversed layer 4, and the metal mesh reinforcement layer 3 and the metal mesh reversed layer 4 are both located on the side of the prefabricated panel 2 close to the slope. The upper and lower ends of the prefabricated panel 2 are respectively provided with rotating shafts 5, one end of the metal mesh reinforcement layer 3 is connected to the rotating shaft 5 located at the lower end of the prefabricated panel 2, and one end of the metal mesh reversed layer 4 is connected to the rotating shaft 5 located at the upper end of the prefabricated panel 2, and a plurality of energy-absorbing support tripods 6 are provided between the metal mesh reinforcement layer 3 and the prefabricated panel 2. In this structural setting, the prefabricated panel 2 is arranged to be inclined from bottom to top toward the slope; the flexible retaining wall structure located at the bottom layer is connected to the foam concrete wall 1, and the rotating shaft at the bottom of the flexible retaining wall structure is arranged on the top surface of the foam concrete wall, and can be fixedly connected to the foam concrete wall by bundling, landfilling, etc.; at the same time, the upper and lower layers of the flexible retaining wall structure can also be connected by bundling or other methods, as long as it can be ensured that the flexible retaining wall structure and the foam concrete wall, as well as the upper and lower layers of the flexible retaining wall structure can be fixedly connected, this can be understood by technicians in this field.

[0036] In a specific embodiment, two adjacent prefabricated panels 2 and two adjacent metal mesh reinforcement layers 3 in each layer of the flexible retaining wall structure are connected by energy-absorbing connectors. In this structural setting, the energy-absorbing connector adopts an existing structure, which plays a shock-absorbing role in the horizontal direction. The energy-absorbing connector adopts the same structure as the hybrid shock-absorbing damping element in patent ZL202010829256.9. The prefabricated panel 2 is a double-twisted hexagonal metal mesh panel, which can allow the retaining wall to undergo a certain displacement through its own deformation.

[0037] See also Figure 2 and Figure 3 The rotating shaft 5 includes a first rotating shaft body 5.1 and two second rotating shaft bodies 5.2 arranged in parallel on both sides of the first rotating shaft body 5.1. The first rotating shaft body 5.1 and the two second rotating shaft bodies 5.2 are connected by a plurality of connecting pins 5.3. Among them, the first rotating shaft body 5.1 is a round rod, and the second rotating shaft body 5.2 is a semi-circular rod. A plurality of connecting holes are arranged on the first rotating shaft body 5.1 and the second rotating shaft body 5.2. A plurality of connecting pins 5.3 are respectively passed through the plurality of connecting holes to rotatably connect the first rotating shaft body 5.1 and the two second rotating shaft bodies 5.2 together. The connecting pin is made of a spring-like material, and its two ends extend out of the outside of the two second rotating shaft bodies 5.2 respectively, for plugging and connecting with the prefabricated panel 2, the metal mesh reinforcement layer 3 or the metal mesh reverse wrapping layer 4. During the construction of the reinforced earth retaining wall, the angle of the rotating shaft can be freely adjusted to adapt to different slope gradients.

[0038] See also Figure 4 The energy-dissipating support tripod 6 is used to support the flexible wall panel, and includes a first side frame 6.1, a second side frame 6.2 and a support rod 6.3. One end of the first side frame 6.1 is provided with an articulated seat 6.1a, and one end of the second side frame 6.2 is provided with an articulated shaft 6.2a articulatedly connected to the articulated seat 6.1a. The first side frame 6.1 and the second side frame 6.2 are provided with a friction groove 6a on the opposite side, and a shock-absorbing spring is installed in the friction groove 6a; the support rod 6.3 is provided with a leaf spring assembly and a damper, and friction blocks made of rubber materials are respectively installed at both ends. When installed, the two friction blocks are respectively inserted into the two friction grooves 6a, forming an effect similar to a sliding friction type rubber bearing. In this structural setting, the energy-dissipating support tripod plays a vertical shock-absorbing role; preferably, the friction grooves 6a are three linear grooves arranged along the length direction of the side frame; a shock-absorbing spring is arranged in each linear groove and at the end away from the hinge; correspondingly, three support rods are provided.

[0039] The shock-absorbing and energy-dissipating reinforced earth retaining wall of the present invention can realize multi-directional and multi-level shock-absorbing and energy-dissipating effects through the functions of foam concrete wall blocks, energy-dissipating support tripods and energy-dissipating connectors, so that the reinforced earth retaining wall can be applied to a wider range of site conditions. The reinforced earth retaining wall is easy to construct and has a high degree of modularization. The design parameters such as the slope and height of the retaining wall can be flexibly adjusted according to site conditions to carry out prefabricated construction.

[0040] This embodiment also provides an assembled construction method for a shock-absorbing and energy-absorbing reinforced earth retaining wall, which is used to construct the reinforced earth retaining wall; the method is specifically carried out according to the following steps:

[0041] Step 1, prefabrication plant construction: the foam concrete wall blocks 1 are poured and cured in the factory and then transported to the construction site for assembly; other components can also be manufactured in the factories of the corresponding manufacturers and then transported to the construction site.

[0042] Step 2: Assemble foam concrete wall blocks: This component mainly supports the foot of the slope. Therefore, the foam concrete wall 1 can be laid at the foot of the slope to a suitable height according to the on-site geological conditions.

[0043] Step 3: From the foot of the slope to the top of the foam concrete wall block 1, fill the soil layer in layers behind the foam concrete wall block 1 (between the foam concrete wall block and the slope), and compact the soil layer using a compactor. The thickness of each compacted soil layer is 0.3 to 0.6 m. To ensure the compaction effect, the fill compaction degree should be greater than 95%; preferably, the thickness of each compacted soil layer is 0.5 m.

[0044] Step 4, first place the rotating shaft 5 on the foam concrete wall block 1, and adjust the rotating shaft 5 to the designed angle according to the design requirements, then install one end of the metal mesh reinforcement layer 3 on the rotating shaft 5, and then install the lower end of the prefabricated panel 2 on the rotating shaft 5; the prefabricated panel 2 and the metal mesh reinforcement layer 3 are respectively connected to the two second rotating shaft bodies 5.2 in the rotating shaft 5 through the connecting pins 5.3.

[0045] Step 5, installing the energy dissipation support tripod 6: installing a plurality of energy dissipation support tripods 6 between the prefabricated panel 2 and the metal mesh reinforcement layer 3, and tying and fixing the plurality of energy dissipation support tripods 6 to the prefabricated panel 2 and the metal mesh reinforcement layer 3 respectively.

[0046] Step 6: Fill soil layers between the prefabricated panel 2 and the slope in layers, and also use a compactor to compact the soil layers. The thickness of each compacted soil layer is 0.3 to 0.6 m. To ensure the compaction effect, the compaction degree of the fill should be greater than 95%; preferably, the thickness of each compacted soil layer is 0.5 m.

[0047] Step 7: first install the rotating shaft 5 on the upper end of the prefabricated panel 2, and then install one end of the metal mesh reverse wrapping layer 4 on the rotating shaft 5 to form a flexible retaining wall structure.

[0048] Step 8: Repeat steps 3 and 6, and then construct other layers of flexible retaining wall structures layer by layer until the reinforced retaining wall reaches the designed height of the fill slope.

[0049] Step 9: Spray grass seeds in the prefabricated panel 2 to form a soil-fixing effect through the plant root system, thereby achieving a greening effect.

[0050] Step 10: Set up intercepting ditches on the top of the slope and on the platform to drain the slope.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shock-absorbing and energy-absorbing reinforced earth retaining wall, characterized in that: The invention comprises a foam concrete wall (1) and a multi-layer flexible retaining wall structure, wherein the foam concrete wall (1) is arranged at the foot of a slope, and the multi-layer flexible retaining wall structure is arranged on the top of the foam concrete wall (1) in an up-and-down manner, and each layer of the flexible retaining wall structure comprises a prefabricated panel (2), a metal mesh reinforcement layer (3) and a metal mesh reverse wrapping layer (4), wherein the prefabricated panel (2) is arranged to be inclined from bottom to top toward the slope, and the upper and lower ends of the prefabricated panel (2) are respectively provided with a rotating shaft (5), one end of the metal mesh reinforcement layer (3) is connected to the rotating shaft (5) located at the lower end of the prefabricated panel (2), and one end of the metal mesh reverse wrapping layer (4) is connected to the rotating shaft (5) located at the upper end of the prefabricated panel (2), and a plurality of metal mesh reinforcement layers (3) and a plurality of metal mesh reverse wrapping layers (4) are arranged between the metal mesh reinforcement layer (3) and the prefabricated panel (2). An energy-absorbing support tripod (6); the energy-absorbing support tripod (6) comprises a first side frame (6.1), a second side frame (6.2) and a support rod (6.3); one end of the first side frame (6.1) is provided with a hinge seat (6.1a), and one end of the second side frame (6.2) is provided with a hinge shaft (6.2a) hingedly connected to the hinge seat (6.1a); the first side frame (6.1) and the second side frame (6.2) are provided with friction grooves (6a) on opposite sides, and shock-absorbing springs are installed in the friction grooves (6a); friction blocks are respectively installed at both ends of the support rod (6.3), and the two friction blocks are respectively inserted in the two friction grooves (6a); the flexible retaining wall structure located at the bottom layer is connected to the top surface of the foam concrete wall (1).

2. The reinforced earth retaining wall according to claim 1, characterized in that: The foam concrete wall (1) comprises a plurality of gabion cages stacked up and down in a stepped arrangement, the inner and outer sides of each layer of the gabion cages are respectively filled with crushed stone materials, and the space between the crushed stone materials on both sides is filled with foam concrete.

3. The reinforced earth retaining wall according to claim 1, characterized in that: In each layer of the flexible retaining wall structure, two adjacent prefabricated panels (2) and two adjacent metal mesh reinforcement layers (3) are connected via energy-absorbing connectors; the prefabricated panels (2) are double-twisted hexagonal metal mesh panels.

4. The reinforced earth retaining wall according to claim 1, characterized in that: The rotating shaft (5) comprises a first rotating shaft body (5.1) and two second rotating shaft bodies (5.2) arranged parallel and symmetrically on both sides of the first rotating shaft body (5.1); the first rotating shaft body (5.1) and the two second rotating shaft bodies (5.2) are connected via a plurality of connecting pins (5.3).

5. The reinforced earth retaining wall according to claim 4, characterized in that: The first rotating shaft body (5.1) is a round rod, and the second rotating shaft body (5.2) is a semi-round rod; the first rotating shaft body (5.1) and the second rotating shaft body (5.2) are both provided with a plurality of connecting holes, and the plurality of connecting pins (5.3) respectively penetrate the plurality of connecting holes.

6. The reinforced earth retaining wall according to claim 1, characterized in that: The friction slide grooves (6a) are three linear slide grooves arranged along the length direction of the side frame; a shock absorbing spring (6.4) is arranged in each linear slide groove and at one end away from the hinged portion.

7. An assembly construction method for a shock-absorbing and energy-absorbing reinforced earth retaining wall as claimed in claim 4 or 5, characterized in that: The following steps are involved: Step 1, assembling foam concrete wall blocks: according to the geological conditions on site, laying the foam concrete wall (1) at the foot of the slope to a suitable height; Step 2: Fill soil layers between the foam concrete wall block (1) and the slope from bottom to top, and compact the soil layers. The thickness of each compacted soil layer is 0.3 to 0.6 m, and the compaction degree of the fill is greater than 95%; Step 3, firstly placing the rotating shaft (5) on the foam concrete wall block (1), and adjusting the rotating shaft (5) to the designed angle according to the design requirements, then installing one end of the metal mesh reinforcement layer (3) on the rotating shaft (5), and then installing the lower end of the prefabricated panel (2) on the rotating shaft (5); the prefabricated panel (2) and the metal mesh reinforcement layer (3) are respectively connected to the two second rotating shaft bodies (5.2) in the rotating shaft (5) by plugging through connecting pins (5.3); Step 4: installing a plurality of energy-absorbing support tripods (6) between the prefabricated panel (2) and the metal mesh reinforcement layer (3), and tying the plurality of energy-absorbing support tripods (6) to the prefabricated panel (2) and the metal mesh reinforcement layer (3), respectively; Step 5, filling soil layers between the prefabricated panel (2) and the slope in layers, and also compacting the soil layers, with each compacted soil layer having a thickness of 0.3 to 0.6 m and a filling compaction degree greater than 95%; Step 6: first install a rotating shaft (5) on the upper end of the prefabricated panel (2), and then install one end of the metal mesh reverse wrapping layer (4) on the rotating shaft (5) to form a flexible retaining wall structure; Step 7, repeating steps 3 to 6 on the formed flexible retaining wall structure until the reinforced retaining wall reaches the designed height of the fill slope; Step 8, spraying grass seeds in the prefabricated panel (2) to form a soil-fixing effect through the plant root system; Step 9: Set up intercepting ditches on the top of the slope and on the platform to drain the slope.

8. The assembly construction method according to claim 7, characterized in that: The step 1 also includes: Step 01, prefabrication plant construction: The foam concrete wall (1) is poured in the prefabrication plant and transported to the construction site for assembly after curing.

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