CN111676739A - Foam light soil structure applied to large-scale filling engineering and construction method - Google Patents
Foam light soil structure applied to large-scale filling engineering and construction method Download PDFInfo
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- CN111676739A CN111676739A CN201911097730.7A CN201911097730A CN111676739A CN 111676739 A CN111676739 A CN 111676739A CN 201911097730 A CN201911097730 A CN 201911097730A CN 111676739 A CN111676739 A CN 111676739A
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- 239000002689 soil Substances 0.000 title claims abstract description 143
- 239000006260 foam Substances 0.000 title claims abstract description 96
- 238000010276 construction Methods 0.000 title claims abstract description 36
- 238000012407 engineering method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 238000009415 formwork Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 235000009421 Myristica fragrans Nutrition 0.000 claims description 2
- 239000001115 mace Substances 0.000 claims description 2
- 239000002002 slurry Substances 0.000 abstract description 9
- 230000036571 hydration Effects 0.000 abstract description 6
- 238000006703 hydration reaction Methods 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 abstract description 5
- 230000008093 supporting effect Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 17
- 230000006872 improvement Effects 0.000 description 7
- 238000011065 in-situ storage Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- 238000013316 zoning Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
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- 241000282461 Canis lupus Species 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000009749 continuous casting Methods 0.000 description 1
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- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a foam light soil structure applied to large-scale filling engineering and a construction method, wherein the foam light soil structure comprises the following components: prefabricating three-dimensional special-shaped foamed light soil blocks and a cast-in-place foamed light soil filling layer, wherein the prefabricated three-dimensional special-shaped foamed light soil blocks are stacked in a groove or a die cavity of a roadbed project to form a gap or a channel for flowing of foamed light soil; the cast-in-place foam light soil filling layer is formed by filling foam light soil in a cast-in-place manner in gaps or channels of the prefabricated three-dimensional special-shaped foam light soil blocks until the whole grooves or the whole die cavities are filled. On one hand, the invention can greatly reduce hydration heat, reduce temperature stress and effectively prevent cracking; on the other hand, the prefabricated block body of the mould injection method has the self-aggregate supporting effect on subsequent cast-in-place slurry, the total shrinkage of the foam soil layer is effectively reduced, the cracking of the foam light soil is further prevented, and meanwhile, the construction efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of railway roadbed engineering, in particular to a foam light soil structure applied to large-scale filling engineering and a construction method.
Background
As a high-efficiency, economic and environment-friendly transportation means, the high-speed railway is developed rapidly in China. However, the high running speed of the high-speed railway puts higher requirements on the smoothness and stability of the line. The roadbed structure is easily influenced by geological conditions and environmental changes due to special material properties, has certain settlement deformation after construction, and is generally provided with transition sections such as road bridge transition sections and road and tunnel transition sections at the positions with uneven deformation.
The existing transition section treatment measures have the disadvantages of high construction difficulty, difficult construction control, high self sedimentation and unsatisfactory non-uniform sedimentation control transition effect. In addition, more and more railway lines of railways pass through deep soft soil areas, and the settlement caused by the railway lines is easy to increase along with the increase of the speed of trains and the load on soft foundations.
At present, the soft soil roadbed usually adopts a foundation reinforcement or improvement mode to reduce post-construction settlement, and a transition section is transited by changing the thicknesses of different materials. The foamed light soil is used for roadbed filling, and provides a new idea for solving the problem. The foamed light soil has the characteristics of low apparent density, high strength, convenience in construction and the like. The foamed light soil can effectively reduce the load of the roadbed by filling the roadbed, so that the roadbed settlement can be controlled under the condition that the roadbed is not treated. The foamed light soil can be applied to other large-scale filling projects besides railway subgrades, and is successfully applied to large-scale filling projects such as Beijing Olympic bird nests, Beijing subway Olympic branches, Jingzhu expressways, Shantou Zhongshan east road reconstruction, Guangfu, Buddha-open expressways widening, Hebei coastal expressways, Guangzhou sub-shipping project Qinghe east road extension reconstruction and the like at present.
Patent 201710533817.9 describes a method for constructing a foamed lightweight soil poured high-speed railway roadbed: dividing a high-speed railway foundation into a foundation bed surface layer and a foundation bed bottom layer; carrying out foundation trench excavation construction according to the height of the high-speed railway foundation; preparing mixed raw materials in the foamed light soil in the bottom layer of the foundation bed; molding in a mold of the bottom layer of the foundation bed; demolding, curing and drying the foamed light soil formed on the bottom layer of the foundation bed; preparing mixed raw materials in the foamed light soil in the surface layer of the foundation bed; molding in a mold of the surface layer of the foundation bed; and (4) demolding, curing and drying the foamed light soil formed on the surface layer of the foundation bed.
The patent 201710533817.9 has the following defects:
the construction method of patent 201710533817.9 is to pour the foamed light soil once. The technology has the defects that when the foam light soil is poured once, the cement-based material in the foam light soil has large centralized heat productivity, so that the thermal expansion is caused, the foam soil is cracked, and the integral stress of the foam soil layer is influenced.
Patent 201910362735.1 describes a method for widening the construction of a foamed light soil high-fill roadbed: the method comprises the steps of firstly, cutting an original old roadbed into a step shape, arranging a concrete baffle plate on the periphery of the widening side of the roadbed, serving as a foam light soil pouring template, horizontally arranging a reinforcing mesh at the position of a large platform, connecting the reinforcing mesh with the baffle plate, additionally arranging a prestressed anchor rod to be anchored on the baffle plate, and performing pouring construction of the foam light soil by layering, partitioning and segmenting. Patent 201810404401.1 describes a construction method of foam light soil for a steep slope section of a high fill of a soft soil roadbed: and (4) excavating the base, and pouring the foam light soil roadbed of the whole line in a segmented, partitioned and comprehensive layered manner.
The defects of the 201910362735.1 patent and the 201810404401.1 patent are:
the construction method of patent 201910362735.1 and patent 201810404401.1 is to pour the foamed lightweight soil in layers, regions and sections. Although the construction is carried out in layering, zoning and segmentation, the foam light soil is a porous structure and is a poor heat conductor, a large amount of heat remains after the foam soil is poured, the foam soil layer can crack, the bonding problem among blocks can be caused by layering, zoning and segmentation construction, the integral stress of the foam soil layer is influenced, in addition, the construction efficiency is inevitably influenced by the layering, zoning and segmentation construction, and the construction period is greatly prolonged.
Patent 201710533817 describes a foamed light soil railway roadbed structure and a construction method: the roadbed structure has shorter construction period than the conventional roadbed filling, has higher bearing strength than a roadbed which is simply poured by using the light soil while keeping the advantage of simply pouring the light soil, can fully exert the performances of all materials, keeps good bearing performance, can reduce later-stage diseases of the roadbed, and saves the maintenance cost during operation.
The patent 201710533817 has the following defects:
patent 201710533817 discloses that the concrete blocks are constructed by autoclaved aerated concrete blocks to form a frame, and then the foamed lightweight soil is poured, although the hydration heat is reduced to a certain extent, the building blocks are constructed, the efficacy is slow, and the integrity of the foamed soil layer is reduced to some extent.
In conclusion, after the foam soil is poured, the hydration heat is large, the heat is not easy to dissipate, the internal temperature is raised, and the foam light soil layer is large in shrinkage and easy to crack; and the problems cannot be completely avoided by adopting the layered, partitioned and segmented construction, the construction efficiency is influenced, and the construction period is prolonged.
Disclosure of Invention
Aiming at the defects in the problems, the invention provides a foam light soil structure applied to large-scale filling engineering and a construction method.
The invention discloses a foam light soil structure applied to large-scale filling engineering, which comprises:
prefabricating three-dimensional special-shaped foam light soil blocks, wherein the prefabricated three-dimensional special-shaped foam light soil blocks are stacked in a groove or a die cavity of roadbed engineering to form a gap or a channel for flowing of foam light soil;
the cast-in-place foam light soil filling layer is formed by filling foam light soil in a cast-in-place manner in gaps or channels of the prefabricated three-dimensional special-shaped foam light soil blocks until the whole grooves or the whole die cavities are filled.
As a further improvement of the invention, the gaps or channels formed among the prefabricated three-dimensional special-shaped foam light soil blocks are not less than 10 mm.
As a further improvement of the invention, the volume of the prefabricated three-dimensional special-shaped foam light soil block is not less than 0.001m3。
As a further improvement of the invention, the filling volume of the prefabricated three-dimensional special-shaped foam light soil block is not less than 60%.
As a further improvement of the invention, the prefabricated three-dimensional special-shaped foam light soil block comprises one or more of a ball body with salient points, a mace body and an ellipsoid.
The invention also discloses a construction method of the foam light soil structure, which comprises the following steps:
prefabricating a three-dimensional special-shaped foam light soil block by adopting a mold injection method;
uniformly stacking the prefabricated three-dimensional special-shaped foamed light soil blocks in a groove or a die cavity of roadbed engineering, and forming gaps or channels for flowing of foamed light soil among the prefabricated three-dimensional special-shaped foamed light soil blocks;
and filling the foam light soil into the gaps or the channels of the prefabricated three-dimensional special-shaped foam light soil blocks by one time or multiple times by adopting a cast-in-place method until the whole groove or the whole die cavity is filled.
As a further improvement of the invention, the three-dimensional special-shaped foam light soil block is prefabricated by adopting a mould injection method; the method comprises the following steps:
manufacturing a special-shaped die with a grouting hole and an exhaust hole in a certain size;
pouring light foam soil into the special-shaped mould through the grouting holes;
and (5) removing the formwork after curing to reach the formwork removal strength to obtain the prefabricated three-dimensional special-shaped foam light soil block.
Compared with the prior art, the invention has the beneficial effects that:
on one hand, the invention can greatly reduce hydration heat, reduce temperature stress and effectively prevent cracking; on the other hand, the prefabricated block body of the mould injection method has the self-aggregate supporting effect on subsequent cast-in-place slurry, the total shrinkage of the foam soil layer is effectively reduced, the cracking of the foam light soil is further prevented, and meanwhile, the construction efficiency is greatly improved.
Drawings
FIG. 1 is a schematic view of a foamed lightweight soil structure according to one embodiment of the present invention;
FIG. 2 is a perspective view of the prefabricated three-dimensional profiled foam lightweight clod 1-1 in FIG. 1;
fig. 3 is a perspective view of the prefabricated three-dimensional profiled foam lightweight soil block 1-2 in fig. 1.
In the figure:
1-1, 1-2 and 1-3, prefabricating three-dimensional special-shaped foam light soil blocks;
2. pouring a foam light soil filling layer in situ;
3. and (5) template.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1 to 3, the present invention provides a foamed lightweight soil structure applied to large-scale filling works, comprising: prefabricating 1-1, 1-2 and 1-3 three-dimensional special-shaped foam light soil blocks and a cast-in-place foam light soil filling layer 2; wherein:
the invention prefabricates 1-1, 1-2, 1-3 of three-dimensional special-shaped foam light soil blocks, prefabricates 1-1, 1-2, 1-3 of three-dimensional special-shaped foam light soil blocks and stacks in a die cavity formed by grooves or templates 3 of roadbed engineering, and gaps or channels for flowing of foam light soil are formed; the cast-in-place foam light soil filling layer 2 is formed by filling foam light soil in a cast-in-place manner in gaps or channels of prefabricated three-dimensional special-shaped foam light soil blocks until the whole groove or a mold cavity is filled.
Furthermore, gaps or channels formed among the prefabricated three-dimensional special-shaped foamed light soil blocks 1-1, 1-2 and 1-3 are not smaller than 10mm, so that the subsequent cast-in-situ foamed light soil can smoothly flow through the special-shaped blocks.
Further, the volume of the prefabricated three-dimensional special-shaped foam light soil blocks 1-1, 1-2 and 1-3 is not less than 0.001m3And is convenient to carry and transport.
Further, the filling volume of the prefabricated three-dimensional profiled foamed lightweight soil block 1-1, 1-2, 1-3 of the present invention is not less than 60% in the integrally formed foamed lightweight soil structure.
Furthermore, the prefabricated three-dimensional special-shaped foam light soil blocks 1-1, 1-2 and 1-3 can be spheres with convex points, wolf tooth rod bodies, ellipsoids or other three-dimensional special-shaped structures, as long as enough gaps and channels can be ensured among naturally stacked blocks, and the follow-up cast-in-situ light foam soil can be ensured to smoothly flow through the special-shaped blocks to the bottom of the groove or the die cavity.
The invention provides a construction method of the foam light soil structure, which combines two processes of a block body by a mould injection method and cast-in-situ light foam soil, and comprises the following steps:
s1, prefabricating the three-dimensional special-shaped foam light soil block by adopting a mold injection method; wherein,
the preparation method comprises the following steps: and manufacturing a special-shaped mould with a certain size and provided with a grouting hole and an exhaust hole, pouring light foam soil into the special-shaped mould through the grouting hole, maintaining to reach the form removal strength, removing the form, and cooling to room temperature to obtain the prefabricated three-dimensional special-shaped foam light soil block.
S2, piling the prefabricated three-dimensional special-shaped foam light soil blocks into a groove or a die cavity which needs to be filled with light foam soil through a dump truck or a crane; the uniquely designed mould shape ensures that enough gaps and channels are formed among the naturally stacked prefabricated three-dimensional special-shaped foam light soil blocks, so that the light foam soil which is subsequently poured can smoothly flow through the gaps and the channels among the special-shaped blocks to flow to the bottom of the groove or the mould cavity;
s3, casting the light foam soil slurry in situ at one time or in multiple times according to the total casting volume by adopting a cast-in-situ method, wherein the light foam soil slurry with higher fluidity flows to the bottom layer through gaps among the anisotropic light foam soil hardened blocks, and the light foam soil slurry is gradually filled in the whole groove or the die cavity along with the continuous casting of the light foam soil slurry.
The invention has the advantages that:
1. in the integrally formed foam light soil structure, the filling volume of the prefabricated three-dimensional special-shaped foam light soil blocks 1-1, 1-2 and 1-3 is not less than 60 percent; as the hydration exothermic reaction of the cement material in the prefabricated three-dimensional special-shaped foam light soil block is almost completely finished, the cement material can not continuously generate heat after being filled into the filling body, but can absorb the heat of the newly poured foam light soil slurry body, the total heat is reduced by over 60 percent, the corresponding temperature stress or temperature rise expansion is further reduced, and the cracking tendency of the poured body is greatly reduced;
2. the prefabricated three-dimensional special-shaped foamed lightweight soil blocks 1-1, 1-2 and 1-3 basically complete self-shrinkage and chemical shrinkage completed by cement hydration before being put into use, and after newly poured foamed lightweight soil slurry is added, the total shrinkage of the foamed lightweight soil structure is reduced by not less than 60% on one hand, and a good self-aggregate supporting effect is achieved on the other hand;
3. the on-site construction progress is accelerated by more than 50%, and the on-site pouring amount is obviously reduced due to the fact that at least 60% of foam light soil is prefabricated in advance, so that on-site construction organization is facilitated, and the construction efficiency is improved;
4. the quality of the three-dimensional special-shaped foam light soil blocks prefabricated in factories is easier to guarantee, the quality control pressure of the field light foam soil is favorably reduced, the foam soil contains a large amount of bubbles, the larger and thicker the field pouring amount is, the bubbles float upwards easily, slurry is easy to segregate, most of prefabricated light foam soil blocks can well solve the problem, and the whole construction quality of a filling layer is further favorably realized.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A foam lightweight soil structure applied to large-scale filling engineering is characterized by comprising:
prefabricating three-dimensional special-shaped foam light soil blocks, wherein the prefabricated three-dimensional special-shaped foam light soil blocks are stacked in a groove or a die cavity of roadbed engineering to form a gap or a channel for flowing of foam light soil;
the cast-in-place foam light soil filling layer is formed by filling foam light soil in a cast-in-place manner in gaps or channels of the prefabricated three-dimensional special-shaped foam light soil blocks until the whole grooves or the whole die cavities are filled.
2. The foamed lightweight soil structure of claim 1 wherein voids or channels formed between said prefabricated three-dimensional shaped foamed lightweight soil blocks are not less than 10 mm.
3. The foamed lightweight soil structure of claim 1 wherein the volume of said prefabricated three-dimensional shaped foamed lightweight soil blocks is not less than 0.001m3。
4. The foamed lightweight soil structure of claim 1 wherein the filling volume of said prefabricated three-dimensional shaped foamed lightweight soil blocks is not less than 60%.
5. The foamed lightweight soil structure of claim 1 wherein said preformed three dimensional shaped foamed lightweight soil blocks comprise one or more of convex spheres, mace and ellipsoids.
6. A construction method of the foamed lightweight soil structure according to any one of claims 1 to 5, comprising:
prefabricating a three-dimensional special-shaped foam light soil block by adopting a mold injection method;
uniformly stacking the prefabricated three-dimensional special-shaped foamed light soil blocks in a groove or a die cavity of roadbed engineering, and forming gaps or channels for flowing of foamed light soil among the prefabricated three-dimensional special-shaped foamed light soil blocks;
and filling the foam light soil into the gaps or the channels of the prefabricated three-dimensional special-shaped foam light soil blocks by one time or multiple times by adopting a cast-in-place method until the whole groove or the whole die cavity is filled.
7. The construction method according to claim 6, wherein the three-dimensional special-shaped foam light soil block is prefabricated by adopting a mould injection method; the method comprises the following steps:
manufacturing a special-shaped die with a grouting hole and an exhaust hole in a certain size;
pouring light foam soil into the special-shaped mould through the grouting holes;
and (5) removing the formwork after curing to reach the formwork removal strength to obtain the prefabricated three-dimensional special-shaped foam light soil block.
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| CN201911097730.7A CN111676739A (en) | 2019-11-12 | 2019-11-12 | Foam light soil structure applied to large-scale filling engineering and construction method |
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| CN201911097730.7A CN111676739A (en) | 2019-11-12 | 2019-11-12 | Foam light soil structure applied to large-scale filling engineering and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252104A (en) * | 2020-09-29 | 2021-01-22 | 河海大学 | Light soil filling method using prefabricated member |
| CN112924656A (en) * | 2021-03-17 | 2021-06-08 | 哈尔滨工业大学 | Temperature-adjustable and pressure-adjustable foam light soil bubble attenuation testing device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5107652A (en) * | 1989-05-24 | 1992-04-28 | Innovacions Tegnologiques S.A. I.T.S.A. | Construction module |
| CN103195070A (en) * | 2013-04-03 | 2013-07-10 | 北京四方如钢混凝土制品有限公司 | Prefabricated block for backfill and backfill method |
| CN104018407A (en) * | 2014-05-06 | 2014-09-03 | 北京四方如钢混凝土制品有限公司 | Road structure and road construction method |
| CN110424414A (en) * | 2019-06-30 | 2019-11-08 | 华泰恒生科技发展（北京）有限公司 | A kind of prefabricated sphere and its production equipment, production method and application method |
-
2019
- 2019-11-12 CN CN201911097730.7A patent/CN111676739A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5107652A (en) * | 1989-05-24 | 1992-04-28 | Innovacions Tegnologiques S.A. I.T.S.A. | Construction module |
| CN103195070A (en) * | 2013-04-03 | 2013-07-10 | 北京四方如钢混凝土制品有限公司 | Prefabricated block for backfill and backfill method |
| CN104018407A (en) * | 2014-05-06 | 2014-09-03 | 北京四方如钢混凝土制品有限公司 | Road structure and road construction method |
| CN110424414A (en) * | 2019-06-30 | 2019-11-08 | 华泰恒生科技发展（北京）有限公司 | A kind of prefabricated sphere and its production equipment, production method and application method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252104A (en) * | 2020-09-29 | 2021-01-22 | 河海大学 | Light soil filling method using prefabricated member |
| CN112924656A (en) * | 2021-03-17 | 2021-06-08 | 哈尔滨工业大学 | Temperature-adjustable and pressure-adjustable foam light soil bubble attenuation testing device and method |
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