CN115162367A - Backfill method of foam concrete for narrow deep foundation pit fertilizer groove - Google Patents
Backfill method of foam concrete for narrow deep foundation pit fertilizer groove Download PDFInfo
- Publication number
- CN115162367A CN115162367A CN202210700964.1A CN202210700964A CN115162367A CN 115162367 A CN115162367 A CN 115162367A CN 202210700964 A CN202210700964 A CN 202210700964A CN 115162367 A CN115162367 A CN 115162367A
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- Prior art keywords
- pouring
- foam concrete
- foundation pit
- fertilizer
- deep foundation
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 55
- 239000003337 fertilizer Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010276 construction Methods 0.000 claims abstract description 20
- 239000002689 soil Substances 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 5
- 239000004568 cement Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005086 pumping Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 230000005484 gravity Effects 0.000 abstract 1
- 239000006260 foam Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000004162 soil erosion Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Foundations (AREA)
Abstract
The invention discloses a backfilling method of a foam concrete for a fertilizer tank of a narrow deep foundation pit, which comprises the following steps: after the waterproof construction of the retaining wall is completed, cleaning a fertilizer groove between the retaining wall and the side wall of the foundation pit; preparing foam concrete; pouring foam concrete in the fertilizer groove; the pouring pipe is moved to ensure the stable pouring; after the pouring is finished, reserving a planting soil position at the upper part of the pouring height; curing the foam concrete; and setting a settlement observation point at the upper opening of the fertilizer tank, and monitoring the settlement of the backfilling. The invention has the beneficial effects that: the uneven compactness of the traditional process is treated; the planning requirement can be met without a secondary settlement period, and the construction period is shortened; the integrity of the foam concrete can not show water and soil loss; large mechanical equipment is not needed to participate in production, and noise pollution and environmental pollution are avoided; the foam concrete has the advantages of high production speed, small occupied production place, simple and convenient pumping construction, filling to each area by the gravity flow function, no dead angle, no need of vibration and cost reduction.
Description
Technical Field
The invention belongs to the field of building construction, and particularly relates to a backfilling method of foam concrete for a fertilizer tank of a narrow deep foundation pit.
Background
With the continuous development of national economy of China, the land for urban construction is in shortage. The construction unit is that the maximize utilizes the soil and reduces all ring edge borders restriction, adopts the vertical excavation of slope protection stake support in the earthwork construction stage, leads to the fertilizer groove size narrow and small, and later stage fertilizer groove backfill is very difficult. According to the specification requirements, the backfill must have sufficient strength and stability, not produce substantial settlement, and meet service functions. However, in engineering practice, due to neglect of factors such as backfill material selection, layered backfill thickness, compaction tools and the like, the problems of ground subsidence cracking, uneven settlement and the like in the later period of a project are often caused.
Disclosure of Invention
The invention aims to: the invention provides a backfilling method of foam concrete for a fertilizer tank of a narrow deep foundation pit, which solves the problems of construction sites: 1. the method has the advantages that good backfill raw materials are not available, and the problem that the construction waste in backfill soil is more and the water resistance of the retaining wall is damaged is solved; 2. the construction site is limited by conditions such as narrow site and the like, and the problem that layered tamping backfilling cannot be carried out according to design requirements is solved; 3. the backfill machinery of the narrow fertilizer tank cannot be constructed, the manual tamping quality cannot be guaranteed, and the problem of garage leakage risk caused by settlement in the later period is solved; 4. the problem that the manual backfilling machinery of the narrow fertilizer groove cannot transport soil due to the restriction of the field, and the potential safety hazard of manual transferring and backfilling is large.
The purpose of the invention is realized by the following technical scheme:
a backfilling method of foam concrete for a fertilizer tank of a narrow and deep foundation pit comprises the following steps:
step (1), after waterproof construction of the retaining wall is completed, cleaning a fertilizer groove between the retaining wall and the side wall of the foundation pit;
step (2), preparing foam concrete;
step (3), pouring foam concrete in the fertilizer groove;
step (4), moving the pouring pipe to ensure that the pouring is stable;
step (5), completing pouring, and reserving a planting soil position at the upper part of the pouring height;
step (6), maintaining the foam concrete;
and (7) setting a settlement observation point at the upper opening of the fertilizer tank, and monitoring the settlement of the backfilling.
Further, in the step (1), the construction waste and the sundries in the fertilizer tank are cleaned, and the accumulated water in the fertilizer tank is pumped out.
Furthermore, in the step (2), the mixing ratio of the foam concrete is tested, the content of air bubbles in the foam concrete is adjusted, the dry density and the strength of the foam concrete are adjusted, a proper amount of additives are added through the test to ensure the fluidity of the foam concrete, and the cement is preferably general portland cement of 42.5 grade or above.
Furthermore, in the step (3), pouring and backfilling are started from a lower place, in the pouring process, the outlet of the pouring pipe is kept horizontal to the pouring surface, pouring is not performed in a spraying mode, and pouring is performed from one end to the other end along the length direction of the pouring area.
Further, in the step (3), when more than one pouring pipes are adopted for pouring, the pouring pipes are arranged side by side and start to pour from one end, or the pouring pipes adopt a diagonal pouring mode.
Further, in the step (4), when the pouring pipe is moved, the pouring pipe is moved backwards along the placing direction of the pouring pipe, and when the pouring pipe is moved leftwards and rightwards, the pouring pipe is lifted out of the surface of the foam concrete to be poured and then moved.
Furthermore, in the step (5), a planting soil position of 1.2-1.8 m is reserved.
Further, in the step (6), the surface of the foamed concrete is covered with a plastic film and cured within 6 to 12 hours.
Furthermore, in the step (7), four equal monitoring accuracies are adopted, the error of the monitoring point is limited to +/-2 mm, and the measurement is carried out once every 7 d.
The foam concrete is a novel material which is prepared by preparing foam from a foaming agent aqueous solution by a physical mechanical method, adding the foam into slurry prepared from cement, water and the like, and carrying out uniform mixing, casting molding and maintenance, and meets the green construction requirements of low carbon, environmental protection and dust emission reduction.
The invention has the beneficial effects that:
1. the problem of uneven compactness of the traditional process (backfilling stone powder or backfilling soil) is solved.
2. The planning requirement can be met without waiting for a secondary settlement period, and the construction period is shortened.
3. The integrity of the foam concrete can not show the problem of soil erosion.
4. Large mechanical equipment such as a loader, an excavator, a road roller, a soil pulling vehicle and the like is not needed to participate in production, and the problems of noise pollution and environmental pollution are avoided.
5. The foam concrete has the advantages of high production speed, small occupied production place, simple and convenient pumping construction, abundant self-flowing function of the foam concrete, no dead angle, no need of vibration and cost reduction.
The main scheme and the further selection schemes can be freely combined to form a plurality of schemes which are all adopted and claimed by the invention; in the invention, the selection (each non-conflict selection) and other selections can be freely combined. The skilled person in the art can understand that there are many combinations, which are all the technical solutions to be protected by the present invention, according to the prior art and the common general knowledge after understanding the scheme of the present invention, and the technical solutions are not exhaustive herein.
Drawings
FIG. 1 is a schematic view of the construction of the present invention.
In the figure: 1-retaining wall, 2-foundation pit side wall, 3-fertilizer groove, 4-foam concrete, 5-garage top plate, 6-foundation pit upper opening and 7-settlement observation point.
Detailed Description
The following non-limiting examples serve to illustrate the invention.
Example 1:
referring to fig. 1, a backfilling method of foam concrete for a narrow deep foundation pit fertilizer groove comprises the following steps.
And (1) cleaning a fertilizer groove 3 between the retaining wall 1 and the side wall 2 of the foundation pit after the waterproof construction of the retaining wall 1 is completed. Cleaning the construction waste and sundries in the fertilizer tank 3, pumping out the accumulated water in the fertilizer tank 3 and ensuring the cleanness in the fertilizer tank 3 before pouring.
And (2) preparing the foam concrete, wherein the foam concrete needs to meet the construction requirement. The mixing proportion of the foam concrete is tested, the content of air bubbles in the foam concrete is adjusted, the dry density and the strength of the foam concrete are adjusted, a proper amount of additives are added through the test to ensure the fluidity of the foam concrete, and the cement is preferably general portland cement of 42.5 grade or above.
And (3) pouring foam concrete 4 in the fertilizer tank 3. Pouring and backfilling are started from a lower place, and the foam concrete is prevented from overflowing. In the pouring process, the outlet of the pouring pipe is kept horizontal with the pouring surface, the pouring is not carried out in a spraying mode, and the pouring direction is from one end to the other end along the length direction of the pouring area. When more than one pouring pipe is adopted for pouring, the pouring pipes are arranged side by side and start to pour from one end, or the pouring pipes adopt a diagonal pouring mode.
And (4) moving the pouring pipe to ensure that the pouring is stable. When the pouring pipe is moved, the pouring pipe is moved backwards along the placing direction of the pouring pipe, and the mode of moving the pouring pipe left and right is not adopted as far as possible. And when the pouring pipe is really required to be moved left and right, the pouring pipe is lifted out of the surface of the currently poured foam concrete and then moved.
And (5) finishing pouring, and reserving a planting soil position at the upper part of the pouring height. Leaving 1.2-1.8 m planting soil position.
Step (6), curing the foam concrete 4; and covering a plastic film on the surface of the foam concrete for curing within 6 to 12 hours.
And (7) setting a settlement observation point 7 at the upper opening of the fertilizer tank 3, and monitoring the settlement of the backfilling. According to engineering measurement Specification (GB 50026-2020), monitoring accuracy is adjusted to four times, errors of monitoring points are limited to +/-2 mm, and measurement is carried out once every 7 d.
The foregoing basic embodiments of the invention and their various further alternatives can be freely combined to form multiple embodiments, all of which are contemplated and claimed herein. In the scheme of the invention, each selection example can be combined with any other basic example and selection example at will.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (9)
1. A backfill method of foam concrete for a fertilizer tank of a narrow deep foundation pit is characterized by comprising the following steps:
step (1), after the waterproof construction of the retaining wall (1) is completed, cleaning a fertilizer tank (3) between the retaining wall (1) and the side wall (2) of the foundation pit;
step (2), preparing foam concrete;
step (3), pouring foam concrete (4) in the fertilizer tank (3);
step (4), moving the pouring pipe to ensure stable pouring;
step (5), completing pouring, and reserving a planting soil position at the upper part of the pouring height;
step (6), curing the foam concrete (4);
and (7) setting a settlement observation point (7) at the upper opening of the fertilizer tank (3) and monitoring the settlement of the backfilling.
2. The backfill method for the fertilizer groove of the narrow deep foundation pit by using the foam concrete according to claim 1, characterized by comprising the following steps of: in the step (1), the construction waste and sundries in the fertilizer tank (3) are cleaned, and accumulated water in the fertilizer tank (3) is pumped out.
3. The backfill method for the fertilizer groove of the narrow deep foundation pit by using the foam concrete according to claim 1, characterized by comprising the following steps of: in the step (2), the mixing proportion of the foam concrete is tested, the content of air bubbles in the foam concrete is adjusted, the dry density and the strength of the foam concrete are adjusted, a proper amount of additives are added through the test to ensure the fluidity of the foam concrete, and the cement is preferably 42.5-grade or above general purpose portland cement.
4. The backfill method for the fertilizer groove of the narrow deep foundation pit by using the foam concrete according to claim 1, characterized by comprising the following steps of: and (3) pouring and backfilling from a lower place, wherein in the pouring process, the outlet of the pouring pipe is kept horizontal to the pouring surface, pouring is not carried out in a spraying mode, and pouring is carried out from one end to the other end along the length direction of the pouring area.
5. The backfill method of a narrow deep foundation pit fertilizer groove by using the foam concrete according to claim 1 or 4, characterized by comprising the following steps: in the step (3), when more than one pouring pipes are adopted for pouring, the pouring pipes are arranged side by side from one end, or the pouring pipes adopt a diagonal pouring mode.
6. The backfill method for the fertilizer groove of the narrow deep foundation pit by using the foam concrete according to claim 1, characterized by comprising the following steps of: in the step (4), when the pouring pipe is moved, the pouring pipe is moved backwards along the placing direction of the pouring pipe, and when the pouring pipe is moved leftwards and rightwards, the pouring pipe is lifted out of the surface of the foam concrete which is currently poured and then moved.
7. The backfill method for the fertilizer groove of the narrow deep foundation pit by using the foam concrete according to claim 1, characterized by comprising the following steps of: and (5) reserving a planting soil position of 1.2-1.8 m.
8. The backfill method for the fertilizer groove of the narrow deep foundation pit by using the foam concrete according to claim 1, characterized by comprising the following steps of: in the step (6), the surface of the foam concrete is covered with a plastic film and cured within 6 to 12 hours.
9. The backfill method for the fertilizer groove of the narrow deep foundation pit by using the foam concrete according to claim 1, characterized by comprising the following steps of: in the step (7), four equal monitoring accuracies are adopted, the error of the monitoring point is limited to +/-2 mm, and the measurement is carried out once every 7 d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210700964.1A CN115162367A (en) | 2022-06-21 | 2022-06-21 | Backfill method of foam concrete for narrow deep foundation pit fertilizer groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210700964.1A CN115162367A (en) | 2022-06-21 | 2022-06-21 | Backfill method of foam concrete for narrow deep foundation pit fertilizer groove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115162367A true CN115162367A (en) | 2022-10-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210700964.1A Pending CN115162367A (en) | 2022-06-21 | 2022-06-21 | Backfill method of foam concrete for narrow deep foundation pit fertilizer groove |
Country Status (1)
| Country | Link |
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| CN (1) | CN115162367A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2020103401A4 (en) * | 2020-11-11 | 2021-01-28 | Beijing Building Materials Engineering Co. Ltd | Self-compacting Liquid Cement for Backfilling Trench |
| CN113186766A (en) * | 2020-12-31 | 2021-07-30 | 广东盛瑞科技股份有限公司 | Shallow soft soil foundation foam light soil embankment structure and construction method |
| CN113431055A (en) * | 2021-05-27 | 2021-09-24 | 同济大学 | Light foam concrete backfilling method for urban abandoned underground space in soft soil area |
| CN214272069U (en) * | 2020-12-07 | 2021-09-24 | 中铁建设集团有限公司 | Can have enough to meet need formula fertile groove at stages and backfill soil barricade support assembly |
| CN113585291A (en) * | 2021-08-11 | 2021-11-02 | 中建八局发展建设有限公司 | Method for backfilling and applying foamed concrete fertilizer groove |
-
2022
- 2022-06-21 CN CN202210700964.1A patent/CN115162367A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2020103401A4 (en) * | 2020-11-11 | 2021-01-28 | Beijing Building Materials Engineering Co. Ltd | Self-compacting Liquid Cement for Backfilling Trench |
| CN214272069U (en) * | 2020-12-07 | 2021-09-24 | 中铁建设集团有限公司 | Can have enough to meet need formula fertile groove at stages and backfill soil barricade support assembly |
| CN113186766A (en) * | 2020-12-31 | 2021-07-30 | 广东盛瑞科技股份有限公司 | Shallow soft soil foundation foam light soil embankment structure and construction method |
| CN113431055A (en) * | 2021-05-27 | 2021-09-24 | 同济大学 | Light foam concrete backfilling method for urban abandoned underground space in soft soil area |
| CN113585291A (en) * | 2021-08-11 | 2021-11-02 | 中建八局发展建设有限公司 | Method for backfilling and applying foamed concrete fertilizer groove |
Non-Patent Citations (1)
| Title |
|---|
| 洪水良;: "软土地区泡沫混凝土回填应用技术", 浙江建筑 * |
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Application publication date: 20221011 |
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| RJ01 | Rejection of invention patent application after publication |