Liquid coal ash abutment back backfilling construction framework applied to narrow space

Abstract

The utility model discloses a liquid coal ash abutment back backfill construction framework applied to a narrow space, which comprises a bridge abutment cap, a plurality of liquid coal ash layers and a plurality of liquid coal ash layers, the conical slope permeable backfill layer is paved in the backfill area; the backfill cement soil paving and pressing layer is paved in the backfill area, and a paving area corresponding to the position under the abutment cap of the bridge abutment is formed between the backfill cement soil paving and pressing layer and the conical slope permeable backfill layer; and the liquid coal ash pouring layer is paved in a paving area right below the abutment cap. The technical problem that the construction progress is affected due to the fact that mechanical vehicles are difficult to walk because building construction sites are all earth surfaces and site roads become muddy in rainy days is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge and culvert engineering construction, and specifically, to a construction framework for backfill of liquid fly ash applied to narrow spaces. Background Art

[0002] Backfill behind abutments is a commonly used measure in civil engineering construction, which plays an important role in several aspects, including terrain improvement, improving land use efficiency, and reducing the impact of traffic loads on infrastructure.

[0003] In the prior art, the construction scenario of backfill behind abutments is generally applied to the connection between subgrade and bridges or culverts to reduce uneven settlement after traffic and alleviate the phenomenon of bump at bridge heads. Backfill behind abutments is also applicable to the transition section between rigid structures and flexible pavement structures, such as the backfill between wing walls behind abutments.

[0004] Meanwhile, backfill behind abutments is usually carried out by compacting with pervious materials or semi-rigid materials, such as cobblestones, gravelly soil, and sandy gravel soil, and requires appropriate gradation of the filler, which is used as the transition treatment between rigid structures and flexible pavement structures and has the advantages of simplicity, economy, and high efficiency.

[0005] However, when carrying out backfill construction for the locally difficult compaction position below the abutment cap of a ribbed abutment, it is difficult to ensure that the compaction degree meets the standard requirements with the traditional backfill filler layer, which is not conducive to the stability of the backfill subgrade, and subsequent excessive vibration will also have a certain adverse impact on the strength of the structure. Summary of the Utility Model

[0006] Therefore, the utility model provides a construction framework for backfill of liquid fly ash applied to narrow spaces to solve the technical problems in the prior art that when carrying out backfill construction for the locally difficult compaction position below the abutment cap of a ribbed abutment, it is difficult to ensure that the compaction degree meets the standard with the traditional backfill filler layer, which is not conducive to the stability of the backfill subgrade, and subsequent excessive vibration will have an adverse impact on the strength of the structure.

[0007] To achieve the above object, the utility model provides the following technical solutions:

[0008] A construction framework for backfill of liquid fly ash applied to narrow spaces, comprising:

[0009] An abutment cap, with a backfill area corresponding to the lower part;

[0010] A permeable backfill layer for the frustum of a cone, paved and arranged in the backfill area;

[0011] The backfilled cement soil paving layer is paved in the backfill area, and a paving area corresponding to the position directly below the abutment cap is formed between the backfilled cement soil paving layer and the permeable backfill layer of the frustum of a cone;

[0012] The liquid fly ash casting layer is paved in the paving area directly below the abutment cap.

[0013] Based on the above technical solutions, the following further description is made for the present utility model:

[0014] As a further solution of the present utility model, it further includes:

[0015] The base surface is paved with a stepped subgrade filling area on the upper part;

[0016] The top position of the stepped subgrade filling area forms the roadbed top;

[0017] The abutment cap is set up in a positioned and elevated manner based on the base surface;

[0018] The backfill area is enclosed between the roadbed top of the subgrade filling area and the base surface and between the stepped surface of the subgrade filling area and the lower part of the abutment cap.

[0019] As a further solution of the present utility model, it further includes:

[0020] The base backfilled cement soil layer is filled and set on one side of the stepped surface of the base surface close to the subgrade filling area, and the backfilled cement soil paving layer is correspondingly paved on the upper part of the base backfilled cement soil layer.

[0021] As a further solution of the present utility model, it further includes:

[0022] The base permeable backfill layer of the frustum of a cone is filled and set at the lower part of the base surface corresponding to the abutment cap, and the base permeable backfill layer of the frustum of a cone is continuously connected with the base backfilled cement soil layer;

[0023] The permeable backfill layer of the frustum of a cone is correspondingly paved on the upper part of the base permeable backfill layer of the frustum of a cone.

[0024] As a further solution of the present utility model,

[0025] The backfilled cement soil paving layer includes a first cement soil paving layer;

[0026] The first cement soil paving layer is correspondingly paved on the upper part of the base backfilled cement soil layer;

[0027] The permeable backfill layer of the frustum of a cone includes a first backfill layer of the frustum of a cone;

[0028] The first slope backfill layer is correspondingly paved on the upper part of the permeable backfill layer of the foundation slope, and a first inverted trapezoidal paving area is formed between the first slope backfill layer and the first soil-cement compaction layer directly below the abutment cap;

[0029] The liquid fly ash casting layer includes a first liquid fly ash layer;

[0030] The first liquid fly ash layer is correspondingly paved in the first inverted trapezoidal paving area.

[0031] As a further solution of the present utility model,

[0032] The backfill soil-cement compaction layer further includes a second soil-cement compaction layer;

[0033] The second soil-cement compaction layer is correspondingly paved on the upper parts of the leveled first soil-cement compaction layer and the first liquid fly ash layer,

[0034] The permeable backfill layer of the slope further includes a second slope backfill layer;

[0035] The second slope backfill layer is correspondingly paved on the upper parts of the leveled first slope backfill layer and the first liquid fly ash layer, and a second inverted trapezoidal paving area is formed between the second slope backfill layer and the second soil-cement compaction layer directly below the abutment cap;

[0036] The liquid fly ash casting layer further includes a second liquid fly ash layer;

[0037] The second liquid fly ash layer is correspondingly paved in the second inverted trapezoidal paving area.

[0038] As a further solution of the present utility model,

[0039] The backfill soil-cement compaction layer includes a third soil-cement compaction layer;

[0040] The third soil-cement compaction layer is correspondingly paved on the upper parts of the leveled second soil-cement compaction layer and the second liquid fly ash layer;

[0041] The permeable backfill layer of the slope includes a third slope backfill layer;

[0042] The third slope backfill layer is correspondingly paved on the upper parts of the leveled second slope backfill layer and the second liquid fly ash layer, and a third inverted trapezoidal paving area is formed between the third slope backfill layer and the third soil-cement compaction layer directly below the abutment cap;

[0043] The liquid fly ash casting layer includes a third liquid fly ash layer;

[0044] The third layer of liquid fly ash is correspondingly paved in the third trapezoidal paving area.

[0045] As a further solution of the present utility model,

[0046] The backfilled cement soil paving layer includes a fourth cement soil paving layer;

[0047] The fourth cement soil paving layer is correspondingly paved on the upper part of the leveled third cement soil paving layer and the third layer of liquid fly ash;

[0048] The permeable backfill layer of the conical slope includes a fourth conical slope backfill layer;

[0049] The fourth conical slope backfill layer is correspondingly paved on the upper part of the leveled third conical slope backfill layer and the third layer of liquid fly ash, and a fourth trapezoidal paving area is formed corresponding to the position directly below the abutment cap between the fourth conical slope backfill layer and the fourth cement soil paving layer;

[0050] The liquid fly ash pouring layer includes a fourth layer of liquid fly ash;

[0051] The fourth layer of liquid fly ash is correspondingly paved in the fourth trapezoidal paving area, and the upper end surface of the leveled fourth layer of liquid fly ash is flush with the lower end surface of the abutment cap.

[0052] As a further solution of the present utility model,

[0053] The setting properties of the first layer of liquid fly ash, the second layer of liquid fly ash, the third layer of liquid fly ash and the fourth layer of liquid fly ash gradually decrease.

[0054] As a further solution of the present utility model,

[0055] The first layer of liquid fly ash, the second layer of liquid fly ash, the third layer of liquid fly ash and the fourth layer of liquid fly ash form at least one set of restricting inner layers after paving;

[0056] Each set of restricting inner layers includes two paving direction corresponding layers that are intersecting and in contact with each other, and the liquid fly ash layers fully interact with each other through the two paving direction corresponding layers of at least one set to form their own restricting forces.

[0057] The present utility model has the following beneficial effects:

[0058] This backfill construction structure can be effectively applied to the locally difficult compaction positions under the ribbed abutment cap. By taking advantage of the characteristic that the liquid fly ash pouring layer has a smaller mass compared to traditional rigid materials of the same volume, the liquid fly ash pouring layer is backfilled to the lower part of the abutment cap. The overall lateral pressure on the back of the abutment is smaller, which can effectively reduce the lateral pressure of the back of the abutment on the abutment, thereby reducing the impact on the stability of the abutment structure. At the same time, the uneven settlement between the back of the abutment and the abutment is reduced. In addition, with the help of the backfill of the liquid fly ash pouring layer, it is more compact, the strength increases rapidly, the construction period can be effectively shortened and the quality can be guaranteed, and the overall functional stability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed by the present invention can cover.

[0060] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the liquid fly ash backfill construction structure for narrow spaces provided by an embodiment of the present invention.

[0061] Figure 2 FIG. 2 is a schematic diagram of the state structure corresponding to the restricted inner layer in the liquid fly ash backfill construction structure for narrow spaces provided by an embodiment of the present invention.

[0062] In the drawings, the list of components represented by each reference numeral is as follows:

[0063] Base surface 1; Subgrade filling area 2; Abutment cap 3; Base cement soil backfill layer 4; Base slope permeable backfill layer 5;

[0064] Slope permeable backfill layer 6: First slope backfill layer 61, Second slope backfill layer 62, Third slope backfill layer 63, Fourth slope backfill layer 64;

[0065] Backfill cement soil paving and compaction layer 7: First cement soil paving and compaction layer 71, Second cement soil paving and compaction layer 72, Third cement soil paving and compaction layer 73, Fourth cement soil paving and compaction layer 74;

[0066] Liquid fly ash pouring layer 8: First liquid fly ash layer 81, Second liquid fly ash layer 82, Third liquid fly ash layer 83, Fourth liquid fly ash layer 84. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0067] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand the other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope protected by the present utility model.

[0068] Terms such as "upper", "lower", "left", "right", "middle" and the like cited in this specification are only for the convenience of clear narration, rather than to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present utility model.

[0069] As Figures 1 to 2 shown, the embodiment of the present utility model provides a construction structure for backfill of liquid fly ash applied to narrow spaces, including a base surface 1, a subgrade filling area 2, a bridge abutment cap 3, a base backfill cement soil layer 4, a base slope permeable backfill layer 5, a slope permeable backfill layer 6, a backfill cement soil compaction layer 7 and a liquid fly ash pouring layer 8, which are used to effectively apply to the locally difficult compaction position under the ribbed bridge abutment cap 3 through the above backfill construction structure. By using the characteristic that the mass of the liquid fly ash pouring layer 8 is smaller than that of the traditional rigid material of the same volume, the liquid fly ash pouring layer 8 is backfilled to the lower part of the bridge abutment cap 3, and the overall lateral pressure on the back of the abutment is smaller, which can effectively reduce the lateral pressure of the back of the abutment on the bridge abutment, thereby reducing the influence on the stability of the bridge abutment structure. At the same time, the uneven settlement between the back of the abutment and the bridge abutment is reduced. In addition, by using the liquid fly ash pouring layer 8 to backfill the back of the abutment, it is more compact and the strength increases rapidly, which can effectively shorten the construction period and ensure the quality, and improve the functional stability and practicability of the overall construction structure. The specific settings are as follows:

[0070] Please refer to Figure 1 , a stepped subgrade filling area 2 is paved on the upper part of the base surface 1, and the top position of the stepped subgrade filling area 2 forms a roadbed top; the bridge abutment cap 3 is set at a raised position based on the base surface 1; the base backfill cement soil layer 4, the base slope permeable backfill layer 5, the slope permeable backfill layer 6, the backfill cement soil compaction layer 7 and the liquid fly ash pouring layer 8 are formed between the roadbed top of the subgrade filling area 2 and the base surface 1 and between the stepped surface of the subgrade filling area 2 and the lower part of the bridge abutment cap 3.

[0071] Specifically, the base backfill cement soil layer 4 is filled and laid on the stepped surface side of the base surface 1 close to the subgrade filling area 2, and the base slope permeable backfill layer 5 is filled and laid at the lower position of the base surface 1 corresponding to the abutment cap 3. Moreover, the base slope permeable backfill layer 5 is continuously connected with the base backfill cement soil layer 4 to form a stable backfill bottom foundation corresponding to the backfill area.

[0072] Please continue to refer to Figure 1 , the slope permeable backfill layer 6 includes a first slope backfill layer 61, a second slope backfill layer 62, a third slope backfill layer 63, and a fourth slope backfill layer 64; the backfill cement soil paving layer 7 includes a first cement soil paving layer 71, a second cement soil paving layer 72, a third cement soil paving layer 73, and a fourth cement soil paving layer 74; the liquid fly ash casting layer 8 includes a first liquid fly ash layer 81, a second liquid fly ash layer 82, a third liquid fly ash layer 83, and a fourth liquid fly ash layer 84; wherein, the first cement soil paving layer 71 is correspondingly paved on the upper part of the base backfill cement soil layer 4, the first slope backfill layer 61 is correspondingly paved on the upper part of the base slope permeable backfill layer 5, and a first inverted trapezoidal paving area is formed between the first slope backfill layer 61 and the first cement soil paving layer 71 directly below the abutment cap 3. The first liquid fly ash layer 81 is correspondingly paved in the first inverted trapezoidal paving area to form a first backfill layer corresponding to the backfill area.

[0073] The second cement soil paving layer 72 is correspondingly paved on the upper parts of the leveled first cement soil paving layer 71 and the first liquid fly ash layer 81, the second slope backfill layer 62 is correspondingly paved on the upper parts of the leveled first slope backfill layer 61 and the first liquid fly ash layer 81, and a second inverted trapezoidal paving area is formed between the second slope backfill layer 62 and the second cement soil paving layer 72 directly below the abutment cap 3. The second liquid fly ash layer 82 is correspondingly paved in the second inverted trapezoidal paving area to form a second backfill layer corresponding to the backfill area.

[0074] The third cement soil paving layer 73 is correspondingly paved on the upper parts of the leveled second cement soil paving layer 72 and the second liquid fly ash layer 82, the third slope backfill layer 63 is correspondingly paved on the upper parts of the leveled second slope backfill layer 62 and the second liquid fly ash layer 82, and a third inverted trapezoidal paving area is formed between the third slope backfill layer 63 and the third cement soil paving layer 73 directly below the abutment cap 3. The third liquid fly ash layer 83 is correspondingly paved in the third inverted trapezoidal paving area to form a third backfill layer corresponding to the backfill area.

[0075] The fourth soil-cement paving layer 74 is correspondingly paved on the upper part of the leveled third soil-cement paving layer 73 and the third liquid fly ash layer 83. The fourth slope backfill layer 64 is correspondingly paved on the upper part of the leveled third slope backfill layer 63 and the third liquid fly ash layer 83. And a fourth inverted trapezoidal paving area is formed corresponding to the position directly below the abutment cap 3 between the fourth slope backfill layer 64 and the fourth soil-cement paving layer 74. The fourth liquid fly ash layer 84 is correspondingly paved in the fourth inverted trapezoidal paving area. And the upper end surface of the leveled fourth liquid fly ash layer 84 is flush with the lower end surface of the abutment cap 3, so as to form a fourth backfill layer corresponding to the backfill area. Thus, the liquid fly ash pouring layer 8 is filled back to the narrow space position under the abutment cap 3. The overall lateral pressure on the back of the abutment is smaller, which can effectively reduce the lateral pressure of the back of the abutment on the abutment, thereby reducing the influence on the stability of the structure of the abutment. At the same time, the uneven settlement between the back of the abutment and the abutment is reduced. In addition, filling the back of the abutment with the liquid fly ash pouring layer 8 is more compact than the traditional backfill layer, and the strength increases faster, which can effectively shorten the construction period and ensure the quality, and improve the functional stability and practicability of the overall construction structure.

[0076] As a preferred implementation of this embodiment, the setting properties of the first liquid fly ash layer 81, the second liquid fly ash layer 82, the third liquid fly ash layer 83 and the fourth liquid fly ash layer 84 gradually decrease, so as to ensure that there is a relative initial reaction period between the layered structures of the liquid fly ash pouring layer 8 from bottom to top, and reduce the early cracks caused by the stress reflection formed by the same setting property and concentration.

[0077] As another preferred implementation of this embodiment, please refer to Figure 2 , after the first liquid fly ash layer 81, the second liquid fly ash layer 82, the third liquid fly ash layer 83 and the fourth liquid fly ash layer 84 are paved, at least one set of restricted inner layers is formed. Each set of restricted inner layers includes two paving direction corresponding layers that are intersecting and in contact with each other, so as to make the liquid fly ash layers more likely to fully interact with each other to form their own restraint force by using several sets of two paving direction corresponding layers, thereby effectively reducing the radial cracks in the same direction.

[0078] Although the present invention has been described in detail above with general descriptions and specific embodiments, on the basis of the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A liquid fly ash platform backfill construction structure used in narrow spaces, characterized in that: include: The abutment cap has a backfill area at the bottom; A conical slope permeable backfill layer is paved in the backfill area; A backfill cement soil paving layer is paved in the backfill area, and a paving area corresponding to the position directly below the abutment cap is formed between the backfill cement soil paving layer and the cone slope permeable backfill layer; The liquid fly ash pouring layer is paved in the paving area directly below the abutment cap.

2. The liquid fly ash platform backfill construction structure for narrow space according to claim 1 is characterized in that: Also includes: The upper part of the foundation surface is paved with a stepped roadbed filling area; The top position of the stepped roadbed filling area forms the roadbed top; The abutment cap is arranged in a positioning manner and elevated based on the foundation surface; The backfill area is formed between the roadbed top of the roadbed filling area and the foundation surface, and between the stepped surface of the roadbed filling area and the lower position of the abutment cap.

3. The liquid fly ash platform backfill construction structure for narrow space according to claim 2 is characterized in that: Also includes: The base backfill cement soil layer is filled and arranged on one side of the stepped surface of the foundation surface close to the roadbed filling area, and the backfill cement soil paving layer is correspondingly paved on the upper part of the base backfill cement soil layer.

4. The liquid fly ash backfill construction structure for narrow space according to claim 3 is characterized in that: Also includes: The base cone slope permeable backfill layer is filled and arranged at the lower position of the foundation surface corresponding to the abutment cap, and the base cone slope permeable backfill layer is continuously connected with the base backfill cement soil layer; The cone slope permeable backfill layer is paved correspondingly on the upper part of the base cone slope permeable backfill layer.

5. The liquid fly ash platform backfill construction structure for narrow space according to claim 4, characterized in that: The backfill cement soil paving layer includes a first cement soil paving layer; The first cement soil paving layer is paved correspondingly on the upper part of the base backfill cement soil layer; The cone slope permeable backfill layer includes a first cone slope backfill layer; The first cone slope backfill layer is paved correspondingly on the upper part of the base cone slope permeable backfill layer, and a first inverted trapezoidal paving area is formed between the first cone slope backfill layer and the first cement soil paving layer at a position corresponding to the position directly below the abutment cap; The liquid fly ash pouring layer includes a first liquid fly ash layer; The first liquid fly ash layer is paved corresponding to the first inverted trapezoidal paving area.

6. The liquid fly ash platform backfill construction structure for narrow space according to claim 5, characterized in that: The backfilled cement soil paving layer also includes a second cement soil paving layer; The second cement soil paving layer is paved on the first cement soil paving layer and the first liquid fly ash layer after leveling. The cone slope permeable backfill layer also includes a second cone slope backfill layer; The second cone slope backfill layer is paved correspondingly on the upper part of the first cone slope backfill layer and the first liquid fly ash layer after leveling, and a second inverted trapezoidal paving area is formed between the second cone slope backfill layer and the second cement soil paving layer at a position corresponding to the position directly below the abutment cap; The liquid fly ash pouring layer also includes a second liquid fly ash layer; The second liquid fly ash layer is paved corresponding to the second inverted trapezoidal paving area.

7. The liquid fly ash platform backfill construction structure for narrow space according to claim 6, characterized in that: The backfill cement soil paving layer includes a third cement soil paving layer; The third cement soil paving layer is paved correspondingly on the upper part of the second cement soil paving layer and the second liquid fly ash layer after leveling; The cone slope permeable backfill layer includes a third cone slope backfill layer; The third cone slope backfill layer is paved correspondingly on the second cone slope backfill layer and the second liquid fly ash layer after leveling, and a third inverted trapezoidal paving area is formed between the third cone slope backfill layer and the third cement soil paving layer at a position corresponding to the position directly below the abutment cap; The liquid fly ash pouring layer includes a third liquid fly ash layer; The third liquid fly ash layer is paved corresponding to the third inverted trapezoidal paving area.

8. The liquid fly ash platform backfill construction structure for narrow space according to claim 7, characterized in that: The backfill cement soil paving layer includes a fourth cement soil paving layer; The fourth cement soil paving layer is paved correspondingly on the upper part of the leveled third cement soil paving layer and the third liquid fly ash layer; The cone slope permeable backfill layer includes a fourth cone slope backfill layer; The fourth cone slope backfill layer is paved correspondingly on the third cone slope backfill layer and the third liquid fly ash layer after leveling, and a fourth inverted trapezoidal paving area is formed between the fourth cone slope backfill layer and the fourth cement soil paving layer at a position corresponding to the position directly below the abutment cap; The liquid fly ash pouring layer includes a fourth liquid fly ash layer; The fourth liquid fly ash layer is paved corresponding to the fourth inverted trapezoidal paving area, and the upper end surface of the fourth liquid fly ash layer after leveling is flush with the lower end surface of the abutment cap.

9. The liquid fly ash platform backfill construction structure for narrow space according to claim 8, characterized in that: The solidification properties of the first liquid fly ash layer, the second liquid fly ash layer, the third liquid fly ash layer and the fourth liquid fly ash layer are gradually reduced.

10. The liquid fly ash platform backfill construction structure for narrow space according to claim 9, characterized in that: The first liquid fly ash layer, the second liquid fly ash layer, the third liquid fly ash layer and the fourth liquid fly ash layer form at least one set of restricted inner layers after paving; Each group of restraining inner layers includes two paving direction corresponding layers arranged in staggered contact, and at least one group of two paving direction corresponding layers is used to make the liquid fly ash layers fully interact with each other to form their own restraining force.

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