CN115110534B - Foundation pit backfilling structure and method - Google Patents
Foundation pit backfilling structure and method Download PDFInfo
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- CN115110534B CN115110534B CN202210761243.1A CN202210761243A CN115110534B CN 115110534 B CN115110534 B CN 115110534B CN 202210761243 A CN202210761243 A CN 202210761243A CN 115110534 B CN115110534 B CN 115110534B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000004927 fusion Effects 0.000 claims abstract description 17
- 239000002689 soil Substances 0.000 claims description 46
- 238000005056 compaction Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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Abstract
The invention discloses a foundation pit backfilling structure and a foundation pit backfilling method. The foundation pit backfill structure comprises a plurality of backfill layers, wherein the plurality of backfill layers are sequentially stacked, a step is formed at the lap joint of two adjacent backfill layers in the plurality of backfill layers, and the orthographic projection of the lower backfill layer in the foundation pit bottom covers the orthographic projection of the upper backfill layer in the foundation pit bottom; the parts, which are in contact with each other, of the adjacent two backfill layers in the plurality of backfill layers are fused to form a fusion part, and the thickness of the fusion part is C, wherein C is more than 500mm. According to the invention, the orthographic projection of the backfill layer positioned below in the adjacent two backfill layers at the bottom of the foundation pit is covered by the orthographic projection of the backfill layer positioned above at the bottom of the foundation pit, so that the bearing capacity of each backfill layer is improved, and the natural sedimentation caused by poor structural stability of the backfill layer is prevented.
Description
Technical Field
The invention relates to the technical field of foundation pit backfill quality control, in particular to a foundation pit backfill structure and a foundation pit backfill method.
Background
At present, the foundation pit backfilling is carried out in two ways, wherein the first form is lower backfilling, because the steel pipe support is not removed yet, the backfilling adopts an automobile to transport to the edge of the foundation pit, soil is poured into the foundation pit, and the foundation pit is manually paved and compacted by a small-sized rammer in layers; the second form is to use a bulldozer to bulldoze after removing the uppermost support, and manually and mechanically symmetrically tamp the support layer by layer to form a foundation pit backfill structure with the same size of each backfill layer.
However, the foundation pit backfill structure with the same backfill soil layer size is easy to generate natural sedimentation, which is not beneficial to controlling engineering quality.
Disclosure of Invention
The invention mainly aims to provide a foundation pit backfill structure and a foundation pit backfill method, and aims to solve the technical problems that in the prior art, the foundation pit backfill structure with the same backfill soil layer size is easy to naturally settle and is not beneficial to controlling engineering quality.
To achieve the above object, according to a first aspect of the embodiments of the present disclosure, a foundation pit backfill structure according to the present disclosure includes:
the backfill layers are sequentially stacked, steps are formed at the lap joint of two adjacent backfill layers in the plurality of backfill layers, and the orthographic projection of the lower backfill layer in the adjacent two backfill layers at the bottom of the foundation pit covers the orthographic projection of the upper backfill layer at the bottom of the foundation pit;
the soil particle size of the backfill layer is A, A is less than 50mm, the thickness of the backfill layer is B,250mm is less than B and less than 300mm, the adjacent two parts of the backfill layer, which are in contact with each other, are fused to form a fusion part, and the thickness of the fusion part is C, wherein C is more than 500mm.
Optionally, the width of the fusion portion is D,0.5m < D < 1m.
Optionally, a reserved part is reserved at the end part of the backfill layer, and the reserved part has the thickness E, wherein E is more than 750mm and less than 800mm.
Optionally, a joint part is reserved at the end part of the backfill layer, and the thickness of the joint part is F, wherein F is more than 550mm and less than 600mm.
Optionally, the backfill soil has a compaction density K, K being greater than or equal to 0.94.
Optionally, the orthographic projection of the backfill layer below the foundation pit bottom in two adjacent backfill layers is a first orthographic projection, the orthographic projection of the backfill layer above the foundation pit bottom is a second orthographic projection, the difference between the lengths of the first orthographic projection and the second orthographic projection is G, G is more than or equal to 1m, and the difference between the widths of the first orthographic projection and the second orthographic projection is H, and H is more than or equal to 0.5m and less than or equal to 1m.
According to a second aspect of the disclosed embodiments, the present invention further provides a foundation pit backfilling method, for the foundation pit backfilling structure, where the foundation pit backfilling method includes:
backfilling soil in the current backfilling space in the foundation pit;
controlling the backfill thickness of the backfill soil through a horizontal elevation so that the backfill thickness meets a preset value;
tamping and compacting the backfill soil to form a current backfill layer in the current backfill space;
and taking the backfill space of the upper layer of the current backfill layer in the foundation pit as the current backfill space, and returning to execute the backfill in the current backfill space in the foundation pit until a foundation pit backfill structure is formed.
Optionally, a plurality of pylons are disposed in the foundation pit, a plurality of pylons are enclosed to form a building inner space, a plurality of pylons and a building outer space is formed between the inner walls of the foundation pit, and when the current backfill space is the bottommost layer of the foundation pit, before the step of backfilling backfill soil in the current backfill space in the foundation pit, the foundation pit backfill method further includes:
backfilling the bottom backfill layer into the external space of the building;
and backfilling the inner backfill layer into the building inner space, wherein the bottom backfill layer and the inner backfill layer jointly form a first backfill layer.
Optionally, the thickness of the bottom backfill layer is I, wherein I is more than or equal to 2m.
Optionally, the post base is connected with a wall post, and the step of controlling the backfill thickness of the backfill person through a horizontal elevation so that the backfill thickness meets a preset value comprises the following steps:
setting a horizontal elevation line on the wall column, and controlling the thickness of each backfill layer through the horizontal elevation so that the thickness of each backfill layer meets a preset value.
According to the technical scheme, the plurality of backfill layers are sequentially stacked, the orthographic projection of the lower backfill layer in the bottom of the foundation pit is covered by the orthographic projection of the upper backfill layer in the bottom of the foundation pit, and the step is formed at the lap joint of the two adjacent backfill layers in the plurality of backfill layers, so that the bearing capacity of each backfill layer is improved, the connection stability among the plurality of backfill layers is improved, the construction quality of foundation pit backfill is controlled, and natural sedimentation caused by poor structural stability of the backfill layers is prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a foundation pit backfill structure according to the present invention;
fig. 2 is a schematic flow chart of a method for backfilling a foundation pit according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The inventive concept of the present invention is further elucidated below in connection with some embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a foundation pit backfill structure according to the present invention.
In one embodiment of the present invention, as shown in fig. 1, the pit backfilling structure includes: the plurality of backfill layers 200 are sequentially stacked, steps are formed at the lap joint of two adjacent backfill layers 200 in the plurality of backfill layers 200, and the orthographic projection of the lower backfill layer 200 in the adjacent two backfill layers 200 at the bottom of the foundation pit 100 covers the orthographic projection of the upper backfill layer 200 at the bottom of the foundation pit 100; wherein, the grain size of the backfill layer 200 is A, A is less than 50mm, the thickness of the backfill layer 200 is B,250mm is less than B and less than 300mm, the parts of the plurality of backfill layers 200, which are contacted with each other, of the adjacent two backfill layers 200 are fused to form a fusion part 300, and the thickness of the fusion part 300 is C, and C is more than 500mm.
In the foundation pit 100, a plurality of backfill layers 200 are sequentially stacked in the direction from the bottom of the foundation pit 100 to the top of the foundation pit 100, and the front projection of the upper backfill layer 200 at the bottom of the foundation pit 100 is covered by the front projection of the lower backfill layer 200 at the bottom of the foundation pit 100, so that a step is formed between the lower backfill layer 200 and the edge of the upper backfill layer 200 of the lower backfill layer 200 of the two adjacent backfill layers 200, and the connection stability between the lower backfill layer 200 and the upper backfill layer 200 of the two adjacent backfill layers 200 is improved, so that the edges of the lower backfill layer 200 and the upper backfill layer 200 of the two adjacent backfill layers 200 are mutually fused more fully, and natural sedimentation is prevented from frequently occurring in the non-return soil layer 200.
It will be understood that, in order to make the fusion between the lower backfill layer 200 and the upper backfill layer 200 of two backfill layers 200 more sufficient, soil particles having a particle diameter of a < 50mm are used, in order to prevent compaction failure due to the thickness of one backfill layer 200 being too thick, the thickness of the backfill layer 200 is B < 250mm < 300mm, the fusion portion 300 refers to a portion where the lower backfill layer 200 and the upper backfill layer 200 of two adjacent backfill layers 200 are fused with each other, and in order to improve the stability between the lower backfill layer 200 and the upper backfill layer 200 of two adjacent backfill layers 200, the thickness of the fusion portion 300 is C, C > 500mm.
According to the technical scheme, the plurality of backfill layers 200 are sequentially stacked, the orthographic projection of the lower backfill layer 200 positioned at the bottom of the foundation pit 100 of the adjacent two backfill layers 200 covers the orthographic projection of the upper backfill layer 200 at the bottom of the foundation pit 100, and the overlapping positions of the adjacent two backfill layers 200 in the plurality of backfill layers 200 are provided with steps, so that the bearing capacity of each backfill layer 200 is improved, the connection stability among the plurality of backfill layers 200 is improved, the control of the backfill construction quality of the foundation pit 100 is facilitated, and the natural sedimentation caused by poor structural stability of the backfill layers 200 is prevented.
In one embodiment of the invention, the width of the fusion 300 is D,0.5m < D < 1m.
It is understood that the fusion part 300 refers to a part where the lower backfill layer 200 and the upper backfill layer 200 of the two backfill layers 200 are fused, and in order to ensure the connection reliability between the lower backfill layer 200 and the upper backfill layer 200 of the two backfill layers 200 and the overall stability of the backfill layers 200, the width of the fusion part 300 is D,0.5m < D < 1m, and the construction quality is improved after the compaction is performed subsequently.
In one embodiment of the invention, the ends of the backfill layer 200 are left with a gap having a thickness E of 750mm < E < 800mm.
In order to improve the connection stability of the reserved joint part and the tamping compaction density of the joint part, the thickness of the reserved joint part is E, and E is more than 750mm and less than 800mm.
In one embodiment of the invention, the ends of backfill layer 200 are left with a joint portion having a thickness F,550mm < F < 600mm.
In order to improve the connection stability of the joint part and the compaction density of the joint part, the thickness of the joint part is F, and F is more than 550mm and less than 600mm.
In one embodiment of the invention, the backfill soil has a compaction density K, K being greater than or equal to 0.94.
It will be appreciated that to ensure that backfill layer 200 is compacted to achieve a relatively stable condition, natural settling is prevented from occurring frequently, and the compacted density of the backfill is K, K being greater than or equal to 0.94.
In an embodiment of the present invention, the front projection of the backfill layer 200 located below the two adjacent backfill layers 200 at the bottom of the foundation pit 100 is a first front projection, the front projection of the backfill layer 200 located above the bottom of the foundation pit 100 is a second front projection, the difference between the lengths of the first front projection and the second front projection is G, G is greater than or equal to 1m, the difference between the widths of the first front projection and the second front projection is H, and H is greater than or equal to 0.5m and less than or equal to 1m.
In order to make the fusion of the lower backfill layer 200 and the upper backfill layer 200 of the two backfill layers 200 at the compacted and compacted edges more sufficient and stable, the length of the lower backfill layer 200 of the two backfill layers 200 is longer than the length of the upper backfill layer 200 by 1m or more, and the length of the lower backfill layer 200 of the two backfill layers 200 is wider than the width of the upper backfill layer 200 by 0.5m or more.
In addition, referring to fig. 2, fig. 2 is a flow chart of a foundation pit backfilling method according to the present invention.
In an embodiment of the present invention, as shown in fig. 2, the present invention further provides a method for backfilling a foundation pit, for the above-mentioned structure for backfilling a foundation pit, where the method for backfilling a foundation pit includes:
s100: backfilling soil in the current backfilling space in the foundation pit 100;
s200: controlling the backfill thickness of the backfill soil through the horizontal elevation so that the backfill thickness meets a preset value;
s300: compacting and compacting backfill to form a current backfill layer in the current backfill space;
s400: taking the backfill space of the upper layer of the current backfill layer in the foundation pit 100 as the current backfill space, and returning to perform backfill in the current backfill space in the foundation pit 100 until the backfill structure of the foundation pit 100 is formed.
For ease of understanding, one embodiment is shown below:
v100: before filling, the foundation hidden engineering is checked and accepted, records are made, and after the foundation hidden engineering is qualified through assessment of each participating unit, the foundation hidden engineering can be filled with soil. Sundries are cleaned up before filling, and accumulated water is discharged.
V200: and removing part of soil with the grain diameter larger than 50mm from the soil field. The backfilling construction is to backfill layers, compact, each layer is filled with 250-300mm thick, constructors level elevation lines on wall posts, and the backfilling elevation control lines are measured according to the layered backfilling thickness, so that the elevation and the thickness of backfilling soil are controlled. The backfilling of the wall column base is symmetrically and simultaneously carried out at two opposite sides or four sides, and the backfilling height difference at two sides is well controlled so as to avoid the wall from being wrung. The tamping adopts a method of combining machinery and manpower, and the machine can be used for compacting in places where the machine can be used, and the manual tamping machine can be used for tamping in places where the machine cannot be used.
V300: and calculating the soil consumption according to the thickness of each layer of backfill soil, and uniformly flattening. For the wider position of the backfill working face, gao Chengzhuang or small lines are used for controlling the thickness and the flatness of the backfill soil.
V400: the thickness of each virtual pavement is 250-300 mm. The step height-to-width ratio of the joint part during segmented backfilling should be made into a 1:2 ladder shape, the layering joint part should not be greater than 1:2 and should be staggered, the distance between the upper layer and the lower layer is not less than 1m, and the rolling overlapping width is 0.5-1 m.
V500: the overlapping part between the non-simultaneous backfilling sections must not form a steep bank, the ramming layer should be left to be stepped, and the width of the step should be greater than 2 times the height.
V600: the backfill soil after flattening needs to be immediately compacted. The common part is rolled back and forth for 4-5 times by an excavator in the longitudinal direction and the transverse direction. The deepened part is firstly tamped and then rolled, the tamping is performed in the longitudinal direction and the transverse direction, the tamping is performed in a half-tamping mode, the tamping is connected, and the tamping position is pressed on the gap of the tamping position in the previous step. Compaction pass: each layer is tamped for 3-4 times. The compaction coefficient of the backfill soil is not less than 0.94. If the compactness still does not meet the requirement after inspection, the compaction should be continued until the requirement is met. The compaction should begin from the periphery and then tamper again to the middle.
V700: each layer of backfill soil is required to be subjected to backfill compaction by detecting the compactness of the backfill soil after the backfill soil is compacted according to the specification, and after the requirement is met, the backfill soil of the upper layer can be subjected to backfill, and the mechanical dead angle is manually compacted, so that no dead angle is left.
And cleaning the base groove before backfilling, and ensuring the drying of the base groove. During backfilling, paying-off staff should follow the work, and in each room, elevation points are made on foundation wall columns and wires are pulled, so that the backfilling staff can master the elevation, and the backfilling staff can not be paved and filled with super-thick materials. The backfill operation process is required to be strictly executed, the layering is not too thick, and the number of rolling passes is enough to prevent the foundation at the backfill from sinking in a large area. The joint is overlapped and tamped according to the specification, and the tamping at the opposite corners is not omitted so as to prevent local sinking. The backfilling should be carried out continuously and completed as soon as possible, especially the filled soil layer is compacted in time before rain or the surface is calendered and made into a certain gradient so as to remove the rain water, and the shift can be carried out after the backfilling and the rolling of each layer are completed. The compaction pass number of each layer is determined by test and detection according to the conditions of soil materials and construction equipment. The maximum dry density of the backfill is measured, and a layer of soil is paved after the maximum dry density of the backfill meets the requirement. The backfill of the detail is strictly controlled, and the part should be included when the compactness is checked. Because the backfill soil is too deep, the backfill soil is ready to be poured with water after being compacted to enable the soil to sink, and the backfill soil is ensured not to sink later.
In an embodiment of the present invention, a plurality of footings are disposed in the foundation pit 100, the plurality of footings are surrounded to form a building inner space, a building outer space is formed between the plurality of footings and an inner wall of the foundation pit 100, and when a current backfill space is a bottommost layer of the foundation pit 100, the backfill method of the foundation pit 100 further includes, before the step of backfilling backfill soil in the current backfill space in the foundation pit 100:
and I100: backfilling the bottom backfill layer 200 to the building exterior space;
i200: the inner backfill layer 200 is backfilled into the building interior space, and the bottom backfill layer 200 and the inner backfill layer 200 together form a first backfill layer 200.
For ease of understanding, one embodiment is shown below:
backfilling outside the column foundation, filling up to the column base surface, compacting while filling up, and backfilling into two parts, wherein the first part is the inner space of the building and the second part is the outer space of the building. The part into which the excavator can drive is paved by the excavator, and then compacted. To the part that machinery can not get into, backfill soil to about 2 meters high at building external space first, then the excavator lifts the arm from the basic beam and shovel the soil and go into, and the long still insufficient place of hook horn, artifical hopper car fortune soil gets into, paves the ramming again, prevents because of the soil body pressure of backfill soil is too big, and the backfill is at building internal space extrusion column base, leads to the column base to produce the displacement towards building external space slope, reduces the potential safety hazard in the work progress, promotes engineering quality.
In this embodiment, the thickness of the bottom backfill layer 200 is I, I+.2m.
It will be appreciated that in order to ensure that the pressure of the soil mass generated by the backfill itself in the interior space of the building squeezes the footing causing displacement of the footing when backfilling the interior space of the building, the thickness of the backfill in the exterior space of the building is greater than or equal to 2m.
In an embodiment of the present invention, the post base is connected to a wall post, and the thickness of each backfill layer 200 is controlled by a horizontal elevation, so that the thickness of each backfill layer meets a preset value, comprising:
l100: a horizontal elevation line is provided on the wall column, and the thickness of each backfill layer 200 is controlled by the horizontal elevation so that the thickness of each backfill layer meets a preset value.
In order to facilitate control of the thickness of backfill in each building interior space and each building exterior space, a horizontal elevation line is provided on the wall column, and the elevation of each backfill layer 200 is monitored and controlled through the horizontal elevation line on the wall column to control the thickness of each backfill layer 200 so that the thickness of each backfill layer meets a preset value.
It can be understood that, referring to the above embodiments, the specific structure of the foundation pit backfilling structure adopts all the technical solutions of all the embodiments, so that the foundation pit backfilling method at least has all the beneficial effects brought by the technical solutions of the embodiments, and is not described in detail herein.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. A foundation pit backfill structure, comprising:
the backfill layers are sequentially stacked, steps are formed at the lap joint of two adjacent backfill layers in the plurality of backfill layers, and the orthographic projection of the lower backfill layer in the adjacent two backfill layers at the bottom of the foundation pit covers the orthographic projection of the upper backfill layer at the bottom of the foundation pit;
the soil particle size of the backfill layer is A, A is less than 50mm, the thickness of the backfill layer is B,250mm is less than B and less than 300mm, the adjacent two parts of the backfill layer, which are in contact with each other, are fused to form a fusion part, and the thickness of the fusion part is C, wherein C is more than 500mm.
2. The foundation pit backfill structure of claim 1, wherein:
the width of the fusion part is D, and D is more than 0.5m and less than 1m.
3. The foundation pit backfill structure of claim 1, wherein:
the end part of the backfill layer is reserved with a reserved joint part, and the thickness of the reserved joint part is E, wherein E is more than 750mm and less than 800mm.
4. The foundation pit backfill structure of claim 1, wherein:
the end part of the backfill layer is reserved with a joint part, the thickness of the joint part is F, and F is more than 550mm and less than 600mm.
5. The foundation pit backfill structure of claim 1, wherein:
the compaction density of the backfill soil is K, and K is more than or equal to 0.94.
6. The foundation pit backfill structure of claim 1, wherein:
the orthographic projection of the backfill layer positioned below in two adjacent backfill layers at the bottom of the foundation pit is a first orthographic projection, the orthographic projection of the backfill layer positioned above at the bottom of the foundation pit is a second orthographic projection, the difference between the lengths of the first orthographic projection and the second orthographic projection is G, G is more than or equal to 1m, and the difference between the widths of the first orthographic projection and the second orthographic projection is H, and H is more than or equal to 0.5m and less than or equal to 1m.
7. A foundation pit backfilling method for a foundation pit backfilling structure according to any one of claims 1 to 6, comprising:
backfilling soil in the current backfilling space in the foundation pit;
controlling the backfill thickness of the backfill soil through a horizontal elevation so that the backfill thickness meets a preset value;
tamping and compacting the backfill soil to form a current backfill layer in the current backfill space;
and taking the backfill space of the upper layer of the current backfill layer in the foundation pit as the current backfill space, and returning to execute the backfill in the current backfill space in the foundation pit until a foundation pit backfill structure is formed.
8. The method of backfilling a foundation pit according to claim 7, wherein a plurality of footings are provided in the foundation pit, a plurality of footings are provided around to form a building interior space, a plurality of footings and an interior wall of the foundation pit form a building exterior space therebetween, and when the current backfill space is a bottommost layer of the foundation pit, the method further comprises, prior to the step of backfilling backfill in the current backfill space in the foundation pit:
backfilling the bottom backfill layer into the external space of the building;
and backfilling the inner backfill layer into the building inner space, wherein the bottom backfill layer and the inner backfill layer jointly form a first backfill layer.
9. The foundation pit backfill method of claim 8, wherein:
the thickness of the bottom backfill layer is I, and I is more than or equal to 2m.
10. The method of pit backfilling according to claim 8, wherein the foundation is connected with a wall column, and the step of controlling the backfill thickness of the backfill member by a horizontal elevation so that the backfill thickness satisfies a preset value comprises:
setting a horizontal elevation line on the wall column, and controlling the thickness of each backfill layer through the horizontal elevation so that the thickness of each backfill layer meets a preset value.
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| JPH0656019B2 (en) * | 1993-01-22 | 1994-07-27 | ダウ化工株式会社 | Lightweight embankment |
| JP4699655B2 (en) * | 2001-09-10 | 2011-06-15 | 大日本土木株式会社 | How to create steep banking |
| US6808339B2 (en) * | 2002-08-23 | 2004-10-26 | State Of California Department Of Transportation | Plantable geosynthetic reinforced retaining wall |
| JP4079975B2 (en) * | 2005-07-19 | 2008-04-23 | 有限会社カヌカデザイン | Retaining wall construction method |
| JP4566257B2 (en) * | 2007-10-23 | 2010-10-20 | 強化土エンジニヤリング株式会社 | Reinforced earth structure |
| CN103912001B (en) * | 2014-04-01 | 2016-08-17 | 中铁六局集团有限公司 | Roadbed backfilling of pipe canal soil " layering splicing processes " construction method |
| CN104988927A (en) * | 2015-05-28 | 2015-10-21 | 青岛市勘察测绘研究院 | Reinforced backfill earthwork ramp and construction method thereof |
| CN108019080A (en) * | 2018-01-25 | 2018-05-11 | 中航天建设工程有限公司 | A kind of construction technology of composite and flexible protective barrier |
| CN110080232A (en) * | 2019-04-04 | 2019-08-02 | 程桂香 | A kind of deep basal pit earth-filling method of underground high water level |
| CN212001226U (en) * | 2020-04-14 | 2020-11-24 | 剧捧捧 | Backfill miscellaneous soil composite foundation structure |
| CN114075805A (en) * | 2020-11-18 | 2022-02-22 | 上海园林（集团）有限公司 | Construction method for foundation earthwork of trestle |
| CN114232587A (en) * | 2021-12-10 | 2022-03-25 | 中国一冶集团有限公司 | Construction method for preventing settlement and cracking of large-area ground |
| CN114606819A (en) * | 2022-04-21 | 2022-06-10 | 陕西建工机械施工集团有限公司 | High-fill structure adopting lime soil to half wrap expansive soil and construction method thereof |
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