Foam polymer soil and earthwork standard room combined abutment back backfilling structure and method

Abstract

The invention discloses an abutment back backfilling structure and method of foam polymeric soil combined with geocells, solves the problem that foam light soil is not suitable for roadbed backfilling in the prior art, and has the beneficial effect of effectively ensuring the strength of a roadbed structure and a pavement structure. According to the specific scheme, the abutment back backfilling structure of the foam polymeric soil combined geocell comprises a foam polymeric soil filling roadbed, multiple layers of geocells are laid in the foam polymeric soil filling roadbed in a layered mode, each layer of geocell has the set height, one end of each geocell is fixed to the abutment back of a bridge and culvert, and the other end of each geocell is fixed to the foundation of the bridge and culvert. The geocell is filled with foam polymeric soil, a concrete layer is laid on the top of the foam polymeric soil filling roadbed, the length of the concrete layer is smaller than that of the foam polymeric soil filling roadbed, one end of the concrete layer is connected with the bridge and culvert abutment back, and the pavement structure is laid on the top of the concrete layer and the top of the foam polymeric soil filling roadbed.

Description

Technical Field

[0001] The invention relates to the field of abutment backfill, in particular to a bridge abutment backfill structure and method of foamed polymer soil combined with geocell. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Chinese patent application CN201510002774.2, entitled A Geocell Lightweight Mixed Soil Reinforced Structure for Bridge Head Treatment, was published on May 20, 2015. In order to solve the bridge head bouncing problem, this solution specifically sets up multiple layers of geocells, with ordinary fillers filled between two adjacent layers of geocells and lightweight mixed soil filled inside the geocells.

[0004] Chinese patent application CN201810979595.8, entitled A reinforced foam lightweight soil widening embankment structure and its construction method, was published on August 27, 2018. In order to reduce the differential settlement of the new and old roadbeds, this scheme is equipped with multiple layers of geocells, each layer of geocells is filled with foam lightweight soil, and the bottom layer of geocells is laid on a cushion sand layer.

[0005] That is to say, in the prior art, in the embankment structure, there are schemes of combining geocells with lightweight mixed soils such as foam lightweight soil, some of which fill foam lightweight soil in geocells, and some of which fill foam lightweight soil on top of geocells. The inventors found that foam lightweight soil is a material made by mixing foam particles with an appropriate amount of cement and other binders. The density of foam lightweight soil is usually between 300-700kg / m3, which is relatively light and more suitable for making lightweight partition walls and sound insulation materials. Foam lightweight soil is used in roadbed filling. Although it has good sound insulation performance, even if it is combined with geocells, the hardness and durability of the roadbed cannot be guaranteed, and it is not suitable for roadbed backfill with more traffic. If foam lightweight soil is used in roadbed filling, the hardness of the pavement structure connected to the bridge deck cannot be guaranteed for a long time, and the problem of vehicle jumping at the bridge head will still occur. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a bridge abutment backfill structure of foamed polymer soil combined with geocells, which effectively ensures the hardness and durability of the pavement structure connected to the bridge deck.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A bridge abutment backfill structure of foamed polymer soil combined with geocells comprises a foamed polymer soil filling roadbed, in which multiple layers of geocells are laid in layers, each layer of geocells has a set height, one end of the geocells is fixed to the bridge culvert abutment, the geocells are filled with foamed polymer soil, a concrete layer is laid on top of the foamed polymer soil filling roadbed, the length of the concrete layer is less than the length of the foamed polymer soil filling roadbed, one end of the concrete layer is connected to the bridge culvert abutment, and a pavement structure is laid on top of the concrete layer and the foamed polymer soil filling roadbed.

[0009] The abutment backfill structure of the foamed polymer soil combined with the geocell as described above, wherein the foamed polymer soil includes cement, lime, foaming agent and solid waste particles of building materials, fully utilizes the solid waste particles of building materials, effectively reduces the pollution caused to the environment, and can also effectively solve the problem of materials used in construction.

[0010] A bridge abutment backfill structure of foamed polymer soil combined with geocell as described above, wherein the diameter of the solid waste particles of the building materials in the roadbed filled with the foamed polymer soil is less than or equal to 5 cm;

[0011] The diameter of the solid waste particles of construction materials used in the foamed polymer soil for filling the geocell is less than or equal to 1 cm.

[0012] As described above, in the abutment backfill structure of foam polymer soil combined with geocell, considering that the main function of the concrete layer is to enhance the strength of the connection between the pavement structure and the bridge deck, the length of the concrete layer is shorter than the length of the topmost geocell, and the length of the concrete layer is longer than the length of the bottommost geocell.

[0013] In the abutment backfill structure of a foamed polymer soil combined with a geocell as described above, the concrete layer includes a first concrete layer and a second concrete layer arranged up and down, the height of the first concrete layer is higher than the height of the second concrete layer, the length of the first concrete layer is shorter than the length of the second concrete layer, the second concrete layer is connected to the top of the foamed polymer soil roadbed through a first rigid part, and the second concrete layer is connected to the first concrete layer through a second rigid part.

[0014] In the abutment backfill structure of foamed polymer soil combined with geocell as described above, the first concrete layer is arranged on the upper surface of the second concrete layer;

[0015] The second concrete layer is spaced a distance from the uppermost geocell.

[0016] The abutment backfill structure of the foamed polymer soil combined with the geocell as described above, wherein the length of the geocells of the multiple layers is gradually shortened starting from the pavement structure and going downwards;

[0017] The distance between two adjacent layers of geocells is set at the same height.

[0018] A bridge abutment backfill structure of a foamed polymer soil combined with a geocell as described above, wherein one end of the geocell is provided with an opening to cooperate with a hook on the back side of the bridge culvert abutment;

[0019] A steel mesh is arranged in the concrete layer, and the steel mesh is connected to the reserved steel bars at the back side of the bridge culvert abutment.

[0020] For the abutment backfill structure of the foamed polymer soil combined with geocell as described above, in order to facilitate construction, a roadbed is arranged outside the uppermost geocell in the foamed polymer soil roadbed, and the roadbed is filled with ordinary fillers.

[0021] In a second aspect, the present invention further discloses a method for backfilling abutments using foamed polymer soil combined with geocells, including the following contents:

[0022] Fill one side of the bridge culvert abutment with foamed polymer soil to build the roadbed;

[0023] The roadbed is filled with foamed polymer soil layer by layer, and geocells are gradually laid during the layered filling process of the foamed polymer soil. One end of the geocell is connected to the back of the bridge culvert abutment, and the geocell is filled with foamed polymer soil.

[0024] After the top geocell is laid, the foamed polymer soil continues to be filled to form a foamed polymer soil filling roadbed;

[0025] A concrete layer is laid on the top of the foamed polymer soil filling roadbed, one end of the concrete layer is connected to the back of the bridge culvert abutment, and the length of the concrete layer is less than the length of the foamed polymer soil filling roadbed;

[0026] The pavement structure is laid on top of the concrete layer and the foamed polymer soil fill subgrade.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1) The present invention adopts foamed polymer soil to fill the roadbed. The density of foamed polymer soil is higher than that of foamed lightweight soil. Foamed polymer soil not only has a high compression modulus and lightness, but also is harder and more durable than foamed lightweight soil. It can be applied to roadbed structures that need to bear loads. Multi-layer geocells are laid in the roadbed filled with foamed polymer soil. The geocells play a reinforcing role. The reinforcement effect can further improve the rigidity and strength of the roadbed. The geocells are filled with foamed polymer soil to ensure the strength of the geocells and bond with the foamed polymer soil on the upper and lower sides of the geocells. In addition, the concrete layer laid on the top of the roadbed filled with foamed polymer soil, the three work together to ensure the strength of the roadbed structure and the pavement structure, and can effectively solve the problem of vehicle jumping at the bridge head;

[0029] Because the foamed aggregate soil is filled with a large number of pore structures, it is very easy to further deteriorate its performance due to the effect of freeze-thaw cycles after the invasion of surface moisture, resulting in a decrease in engineering mechanical properties. The geocells are laid in layers in the roadbed, which can effectively prevent the extension and development of cracks after the foamed aggregate soil deteriorates.

[0030] 2) The foamed polymer soil of the present invention uses cement, lime, foaming agent and solid waste particles of building materials, making full use of the solid waste particles of building materials, effectively reducing the pollution caused to the environment, and effectively solving the problem of materials used in construction;

[0031] By using solid waste particles of construction materials of different particle sizes, the strength of the foamed polymer soil filled in the geocell and the foamed polymer soil roadbed can be ensured respectively, and their respective constructions can be facilitated.

[0032] 3) In the present invention, two layers of concrete are arranged upper and lower, the lower second concrete layer is in contact with the foamed polymer soil roadbed and connected by a first rigid part, and the two concrete layers are connected by a second rigid part. In this way, when the mechanical properties of the foamed polymer soil roadbed decrease, the setting of the rigid part can effectively enhance the integrity of the concrete layer and the roadbed structure, thereby effectively ensuring the long-term service performance of the roadbed.

[0033] 4) In the present invention, an opening is provided at one end of the geocell to facilitate cooperation with the hook on the back side of the bridge culvert abutment, thereby fixing the geocell to the bridge culvert abutment and avoiding separation from the bridge culvert abutment during the service of the roadbed; a steel mesh is provided in the concrete layer, the steel mesh is used to combine with the poured concrete to ensure the strength of the concrete layer, and the steel mesh is connected to the reserved steel bars on the back side of the bridge culvert abutment, which is conducive to the reliable connection of the concrete layer with the back side of the bridge culvert abutment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 It is a schematic diagram of a bridge abutment backfill structure of a foamed polymer soil combined with a geocell according to one or more embodiments of the present invention.

[0036] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0037] Among them: 1. Pavement structure, 2. Upper roadbed, 3. Second concrete layer, 4. First concrete layer, 5. Bridge deck, 6. Geocell, 7. Foam polymer soil roadbed, 8. Bridge and culvert abutment back. DETAILED DESCRIPTION

[0038] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0040] As introduced in the background technology, the foamed lightweight soil in the prior art is not suitable for the problem of roadbed backfilling. In order to solve the above technical problems, the present invention proposes a bridge abutment backfill structure of foamed polymer soil combined with geocell.

[0041] Embodiment 1

[0042] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a bridge abutment backfill structure of foam polymer soil combined with geocell includes a foam polymer soil roadbed 7, in which multiple layers of geocells 6 are laid in layers, each layer of geocells 6 has a set height, one end of the geocells is fixed to the bridge culvert abutment 8, the geocells are filled with foam polymer soil, a concrete layer is laid on the top of the foam polymer soil roadbed, the length of the concrete layer is less than the length of the foam polymer soil roadbed, one end of the concrete layer is connected to the bridge culvert abutment 8, and the pavement structure 1 is laid on the top of the concrete layer and the foam polymer soil roadbed.

[0043] In this embodiment, the foamed polymer soil includes cement, lime, foaming agent and solid waste particles of building materials, which fully utilizes the solid waste particles of building materials (particles formed during the demolition of buildings), effectively reduces the pollution to the environment, and can also effectively solve the problem of materials used in construction.

[0044] Specifically, the mass percentages of cement, lime, foaming agent and solid waste particles of building materials are: 25%-40%, 10%-20%, 10%-9% and 40%-55%. The foaming agent can be selected from existing spherical EPS polystyrene foam. Multiple specimens are made, and the specimens are subjected to uniaxial compressive strength tests. The strengths of the three test samples after 7 days are 7.81MPa, 7.69MPa and 7.52MPa, respectively, which meet the test requirements.

[0045] It is understandable that, due to the large area of ​​the foamed polymer soil filling roadbed, the diameter of the solid waste particles of the building materials in the foamed polymer soil filling roadbed is less than or equal to 5 cm;

[0046] The height of the geocell 6 is relatively small. To ensure that the foamed polymer soil is fully combined with the geocell, the diameter of the solid waste particles of the building materials used in the foamed polymer soil for filling the geocell is less than or equal to 1 cm.

[0047] Considering that the main function of the concrete layer is to enhance the strength of the connection between the pavement structure and the bridge deck, the length of the concrete layer is shorter than the length of the uppermost geocell, and the length of the concrete layer is longer than the length of the lowermost geocell.

[0048] It should be noted that the concrete layer includes a first concrete layer 4 and a second concrete layer 3 which are arranged up and down, the height of the first concrete layer 4 is higher than the height of the second concrete layer 3, the length of the first concrete layer is shorter than the length of the second concrete layer, the second concrete layer is connected to the top of the foamed polymer soil roadbed through a first rigid part, and the second concrete layer is connected to the first concrete layer through a second rigid part.

[0049] The first concrete layer 4 is arranged on the upper surface of the second concrete layer 3; the second concrete layer is arranged at a distance from the uppermost geocell.

[0050] It is easy to understand that, starting from the pavement structure 1 and gradually going downwards, the length of the multi-layer geocells is gradually shortened to form a wedge or a prism; the interval between two adjacent layers of geocells is set to the same height, which can be 1-2m. Specifically, the geocells can be 4-6 layers, and the length of the top geocell can be 10-15m. The geocells also have a set width.

[0051] In this embodiment, an opening is provided at one end of the geocell 6 to cooperate with the hook on the back side of the bridge culvert abutment. The hook on the back side of the bridge culvert abutment can be an embedded part. A plurality of hooks can be provided in layers to connect with the geocells of each layer. Each layer is provided with a plurality of hooks, and the plurality of hooks are respectively connected with the openings corresponding to the geocells.

[0052] In some other examples, a plurality of openings are provided at one end of the geocell, and a connecting rod is fixedly provided at each opening. The connecting rod is a steel bar, which can be welded and connected to the fixed steel bars (reserved fixed steel bars) provided on the back side of the culvert abutment to ensure a stable connection between the geocell and the back of the culvert abutment.

[0053] Among them, a steel mesh is arranged in the concrete layer, and the steel mesh is used to combine with the poured concrete to ensure the strength of the concrete layer. The steel mesh is connected with the reserved steel bars on the back side of the bridge culvert abutment, which is conducive to the reliable connection between the concrete layer and the back side of the bridge culvert abutment.

[0054] During the construction of the second concrete layer in the lower layer, the steel mesh of the second concrete layer is provided with a downward first rigid member such as a first steel bar, and an upward second rigid member such as a second steel bar. The first steel bar and the second steel bar can be arranged alternately, and multiple first steel bars and second steel bars are respectively arranged. The first steel bar and the second steel bar are respectively fixedly connected to the steel mesh in the second concrete layer. In this way, when the mechanical properties of the foam polymer soil roadbed are reduced, the arrangement of the first steel bar and the second steel bar can effectively enhance the integrity of the concrete layer and the roadbed structure, thereby effectively ensuring the long-term service performance of the roadbed.

[0055] To facilitate construction, an upper roadbed 2 is provided on the outside of the topmost geocell in the foamed polymer soil roadbed. The upper roadbed 2 is filled with ordinary fillers, such as backfill soil. The backfill soil is arranged away from the bridge deck and on the outside of the topmost geocell 6, which will not affect the strength of the foamed polymer soil roadbed 7.

[0056] In the structure provided by the present invention, the present invention adopts foamed polymer soil to fill the roadbed 7. The density of foamed polymer soil is higher than that of foamed lightweight soil. Foamed polymer soil not only has a higher compression modulus and lightness, but also is harder and more durable than foamed lightweight soil. Multiple layers of geocells are laid in the foamed polymer soil filled roadbed. The geocells 6 play a reinforcement role. The reinforcement effect can further improve the stiffness and strength of the roadbed, which can be suitable for roadbed structures that need to bear loads. Together with the concrete layer laid on the top of the foamed polymer soil filled roadbed, the three work together to ensure the strength of the roadbed structure and the pavement structure, and can effectively solve the problem of vehicle jumping at the bridge head.

[0057] Embodiment 2

[0058] This embodiment discloses a bridge abutment backfill method using foamed polymer soil combined with geocells, including the following contents:

[0059] Fill one side of the bridge culvert abutment with foamed polymer soil to build the roadbed;

[0060] The roadbed is filled with foamed polymer soil layer by layer, and geocells are gradually laid during the layered filling process of the foamed polymer soil. One end of the geocell is connected to the back of the bridge culvert abutment, and the geocell is filled with foamed polymer soil.

[0061] After the top geocell is laid, the foamed polymer soil continues to be filled to form a foamed polymer soil filling roadbed;

[0062] A concrete layer is laid on the top of the foamed polymer soil filling roadbed, one end of the concrete layer is connected to the back of the bridge culvert abutment, and the length of the concrete layer is less than the length of the foamed polymer soil filling roadbed;

[0063] The pavement structure is laid on top of the concrete layer and the foamed polymer soil fill subgrade.

[0064] During the construction process, the foamed polymer soil is mixed on site and directly poured.

[0065] 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 bridge abutment backfill structure of foamed polymer soil combined with geocell, characterized in that: It includes a foamed polymer soil fill roadbed, in which multiple layers of geocells are laid in layers, each layer of geocells has a set height, one end of the geocells is fixed to the back of the bridge and culvert, the geocells are filled with foamed polymer soil, a concrete layer is laid on the top of the foamed polymer soil fill roadbed, the length of the concrete layer is less than the length of the foamed polymer soil fill roadbed, one end of the concrete layer is connected to the back of the bridge and culvert, and the pavement structure is laid on the top of the concrete layer and the foamed polymer soil fill roadbed.

2. The abutment backfill structure of foamed polymer soil combined with geocell according to claim 1 is characterized in that: The foamed polymer soil comprises cement, lime, a foaming agent and solid waste particles of building materials.

3. The abutment backfill structure of foamed polymer soil combined with geocell according to claim 2 is characterized in that: In the foamed polymer soil roadbed, the diameter of the building material solid waste particles is less than or equal to 5 cm; The diameter of the solid waste particles of construction materials used in the foamed polymer soil for filling the geocell is less than or equal to 1 cm.

4. The abutment backfill structure of foamed polymer soil combined with geocell according to claim 1 is characterized in that: The length of the concrete layer is shorter than the length of the uppermost geocell, and the length of the concrete layer is longer than the length of the lowermost geocell.

5. The abutment backfill structure of foamed polymer soil combined with geocell according to claim 1 is characterized in that: The concrete layer includes a first concrete layer and a second concrete layer arranged up and down, the height of the first concrete layer is higher than the height of the second concrete layer, the length of the first concrete layer is shorter than the length of the second concrete layer, the second concrete layer is connected to the top of the foamed polymer soil roadbed through a first rigid part, and the second concrete layer is connected to the first concrete layer through a second rigid part.

6. The abutment backfill structure of foamed polymer soil combined with geocell according to claim 5 is characterized in that: The first concrete layer is disposed on the upper surface of the second concrete layer, The second concrete layer is spaced a distance from the uppermost geocell.

7. The abutment backfill structure of foamed polymer soil combined with geocell according to claim 1 is characterized in that: Starting from the pavement structure and gradually going downward, the lengths of the multiple layers of geocells are gradually shortened; The distance between two adjacent layers of geocells is set at the same height.

8. The abutment backfill structure of foamed polymer soil combined with geocell according to claim 1 is characterized in that: An opening is provided at one end of the geocell to cooperate with a hook on the back side of the bridge culvert platform; A steel mesh is arranged in the concrete layer, and the steel mesh is connected to the reserved steel bars at the back side of the bridge culvert abutment.

9. The abutment backfill structure of foamed polymer soil combined with geocell according to claim 1, characterized in that: In the foamed polymer soil roadbed, an upper roadbed is arranged outside the uppermost geocell, and the upper roadbed is filled with common fillers.

10. A method for backfilling abutments with foamed polymer soil combined with geocells, characterized in that: It includes the following: Fill one side of the bridge culvert abutment with foamed polymer soil to build the roadbed; The roadbed is filled with foamed polymer soil layer by layer, and geocells are gradually laid during the layered filling process of the foamed polymer soil. One end of the geocell is connected to the back of the bridge culvert abutment, and the geocell is filled with foamed polymer soil. After the top geocell is laid, the foamed polymer soil continues to be filled to form a foamed polymer soil filling roadbed; A concrete layer is laid on the top of the foamed polymer soil filling roadbed, one end of the concrete layer is connected to the back of the bridge culvert abutment, and the length of the concrete layer is less than the length of the foamed polymer soil filling roadbed; The pavement structure is laid on top of the concrete layer and the foamed polymer soil fill subgrade.

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