CN116180761A - Method for excavating foundation pit of firefighting elevator of building basement in coastal area - Google Patents
Method for excavating foundation pit of firefighting elevator of building basement in coastal area Download PDFInfo
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- CN116180761A CN116180761A CN202310359353.XA CN202310359353A CN116180761A CN 116180761 A CN116180761 A CN 116180761A CN 202310359353 A CN202310359353 A CN 202310359353A CN 116180761 A CN116180761 A CN 116180761A
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- foundation pit
- excavation
- elevator
- basement
- firefighting
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000009412 basement excavation Methods 0.000 claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 239000004567 concrete Substances 0.000 claims description 10
- 239000011449 brick Substances 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 2
- 239000012634 fragment Substances 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 7
- 238000011835 investigation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
Abstract
The invention discloses a basement fire-fighting elevator foundation pit excavation method for a coastal area building, belongs to the technical field of foundation pit support, aims at solving the construction requirement that the special environment of the coastal beach area cannot be ensured by the conventional basement fire-fighting elevator foundation pit enclosure, and aims at overcoming the defects and shortcomings, adopts a large-scale building basement fire-fighting elevator foundation pit excavation enclosure method for the coastal beach area, adopts layered small-gradient excavation, namely adopts the measures of rapid forming of the lower-layer fire-fighting elevator foundation pit enclosure and secondary utilization of building fragments by adopting the upper-layer fire-fighting elevator foundation pit enclosure, avoids large and wide slope excavation, further perturbs the basement bottom plate base layer, and ensures the personal safety of operators while guaranteeing the construction quality of the fire-fighting elevator foundation pit.
Description
Technical Field
The invention belongs to the technical field of foundation pit support, and particularly relates to a method for excavating a foundation pit of a firefighting elevator of a basement of a coastal area building.
Background
The total length of the coastline of China is about 3.2 ten thousand kilometers, wherein the coastline of the continental coastline is about 1.8 ten thousand kilometers, a plurality of lands are formed by alluvium along the coastline (such as salt city of Jiangsu province), most of the soil is silt, filled soil, miscellaneous fill and other high-pressure compressible soil, and the soil has the characteristics of higher water content, larger pores, lower shear strength and obvious rheological property, so that the soil body has lower strength and is easy to flow unstably. For foundation pit construction in coastal areas, engineering accidents such as collapse and substrate bulge are easy to occur due to poor foundation pit excavation construction conditions. The basement of a high-rise or large building is newly built, and the peripheral foundation pit slope during construction is calculated and supported by a design unit so as to ensure the quality of foundation engineering and the personal safety of operators.
But where the excavated envelope of the firefighting elevator pit in the basement tends to be ignored. Because the type of special soil in special environment, namely weak soil layer in coastal beach area, is not known enough, the depth of the firefighting elevator foundation pit exceeds about 2.5 meters of the basement foundation pit, if the conventional mode is adopted for slope excavation, the excavation surface is only large and wide, and when the firefighting elevator foundation pit is constructed, the personnel safety of operators is threatened, and the engineering quality of the firefighting elevator foundation pit is affected.
Disclosure of Invention
In order to solve the technical problems, the inventor obtains the technical scheme of the invention through practice and summary, and the invention discloses a method for excavating a foundation pit of a firefighting elevator of a basement of a coastal area building, which comprises the following steps:
s1, determining an excavation coefficient according to two layers of excavation according to a firefighting elevator foundation diagram and a land investigation report, determining a first layer of excavation line of an elevator foundation pit, performing the first layer of excavation, overlapping with a second layer of excavation line of the elevator foundation pit when the excavation is half the depth, continuing the second layer of excavation, and overlapping with a control line at the bottom of the elevator foundation pit when the excavation is to a bearing layer at the bottom of the elevator foundation pit;
s2, according to the requirements of a drawing on the firefighting elevator foundation pit, square timber and a template are assembled around the elevator foundation pit, a steel pipe is pressed into a bearing layer at the bottom of the elevator foundation pit by excavation equipment in sequence against the square timber, and then a jackscrew and the steel pipe are assembled to support and fix the steel pipe;
s3, placing a reinforcing mesh on the outer side of the template, and pouring concrete around the reinforcing mesh;
s4, building cement solid brick masonry on the poured concrete;
s5, after the cement solid brick masonry is built, filling up the mixture to the first layer of excavation line of the elevator foundation pit;
s6, pulling out the steel pipe, and removing the square timber and the template.
Further preferably, in S2, the thickness of the square timber and the thickness of the template are both 10mm, and the length of the steel pipe is 1.5m.
Further preferably, in S2, the heights of the square timber and the template are half of the height of the elevator foundation pit.
Further preferably, the concrete poured in S3 is C25 quick setting concrete.
Further preferably, in S4, the thickness of the cement solid brick masonry is 200mm.
Further preferably, in S5, the mixture is a mixture of M7.5 cement mortar and building slag.
Compared with the prior art, the invention can obtain the following technical effects:
aiming at the construction requirement that the special environment of the coastal beach area cannot be ensured by the conventional basement fire elevator foundation pit enclosure, the invention adopts a method for excavating and enclosing a large-scale building basement fire elevator foundation pit in the coastal beach area to make up the defects and shortcomings, adopts layered small-gradient excavation, namely, the lower-layer fire elevator foundation pit enclosure adopts the measures of rapid forming of the enclosure, the upper-layer fire elevator foundation pit enclosure adopts the secondary utilization of building slag, and the large and wide slope excavation is stopped, so that the basement bottom plate base layer is disturbed, the construction quality of the fire elevator foundation pit is ensured, and the personal safety of operators is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a top view of the present invention;
fig. 2 is a cross-sectional view of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The principles of the invention will be further described with reference to the drawings and specific examples.
Examples
As shown in fig. 1-2, aiming at the construction requirement that the special environment of the coastal beach area cannot be ensured by the existing conventional basement firefighting elevator foundation pit enclosure, the construction method adopts layered small-gradient excavation, namely, the lower firefighting elevator foundation pit enclosure adopts rapid forming protection, the upper firefighting elevator foundation pit enclosure adopts a measure of reutilizing building slag, so that large and wide slope excavation is stopped, the basement bottom plate base layer is disturbed, the construction quality of the firefighting elevator foundation pit is ensured, and the personal safety of operators is ensured, and the specific steps are as follows:
s1, determining an excavation coefficient according to two layers of excavation according to a firefighting elevator foundation diagram and a land investigation report, determining a first layer of excavation line 1 of an elevator foundation pit, performing first layer excavation, overlapping with a second layer of excavation line 2 of the elevator foundation pit when the excavation is half the depth, continuing the second layer excavation, and overlapping with a bottom control line 4 of the elevator foundation pit when the excavation is performed to a bottom bearing layer 3 of the elevator foundation pit;
s2, according to the requirements of a drawing on a firefighting elevator foundation pit, combining and installing square timber 5 with the length of 10mm and a template 6 with the length of 10mm around the elevator foundation pit, wherein the heights of the square timber 5 and the template 6 are half of that of the elevator foundation pit, sequentially pressing a steel pipe 7 with the length of 1.5m into a bearing layer 3 at the bottom of the elevator foundation pit by using excavation equipment, and then combining and supporting the steel pipe 7 by using jackscrews and the steel pipe;
s3, placing a reinforcing mesh 8 on the outer side of the template 6, and pouring C25 quick-setting concrete around the reinforcing mesh 8;
s4, building a cement solid brick masonry 9 with the thickness of 200mm on the poured C25 quick setting concrete;
s5, after the cement solid brick masonry 9 is built, filling up the mixture 10 of M7.5 cement mortar and building slag upwards to the first layer excavation line 1 of the elevator foundation pit;
s6, pulling out the steel pipe 7, and removing the square timber 5 and the template 6.
Working principle: 1) Layered excavation is carried out, so that the excavation range is reduced; 2) The lower layer utilizes a steel pipe supporting template, and quick concreting is adopted to quickly pour, so that the possibility of collapse of the bottom of the excavation can be quickly prevented; 3) The upper layer is filled with the mixture of the building slag and the cement mortar, so that the consistency of a bearing layer of an excavated slope position and a bearing layer of a basement foundation pit can be ensured, the engineering quality is ensured, the building waste can be reused, and the economic benefit is obvious.
Claims (6)
1. The method for excavating the foundation pit of the firefighting elevator of the basement of the coastal area building is characterized by comprising the following steps of:
s1, determining an excavation coefficient according to two layers of excavation according to a firefighting elevator foundation diagram and a geological survey report, determining a first layer of excavation line (1) of an elevator foundation pit, performing first layer excavation, overlapping with a second layer of excavation line (2) of the elevator foundation pit when the excavation is half the depth, continuing the second layer excavation, and overlapping with a bottom control line (4) of the elevator foundation pit when the excavation is to a bottom bearing layer (3) of the elevator foundation pit;
s2, according to the requirements of a drawing on a firefighting elevator foundation pit, combining square timber (5) and templates (6) to be installed around the elevator foundation pit, sequentially pressing steel pipes (7) against the square timber (5) into a bearing layer (3) at the bottom of the elevator foundation pit by using excavation equipment, and then combining jackscrews and the steel pipes to support and fix the steel pipes (7);
s3, placing a reinforcing mesh (8) on the outer side of the template (6), and pouring concrete around the reinforcing mesh (8);
s4, building a cement solid brick masonry (9) on the poured concrete;
s5, after the cement solid brick masonry (9) is built, filling up the mixture (10) to the first layer of excavation line (1) of the elevator foundation pit;
s6, pulling out the steel pipe (7), and removing the square timber (5) and the template (6) at the same time.
2. The method for excavating the foundation pit of the firefighting elevator of the basement of the coastal area building, which is characterized by comprising the following steps of: in S2, the thicknesses of the square timber (5) and the templates (6) are 10mm, and the length of the steel pipe (7) is 1.5m.
3. The method for excavating the foundation pit of the firefighting elevator of the basement of the coastal area building, which is characterized by comprising the following steps of: in S2, the heights of the square timber (5) and the templates (6) are half of the heights of the elevator foundation pit.
4. The method for excavating the foundation pit of the firefighting elevator of the basement of the coastal area building, which is characterized by comprising the following steps of: and (3) the concrete poured in the step (S3) is C25 quick setting concrete.
5. The method for excavating the foundation pit of the firefighting elevator of the basement of the coastal area building, which is characterized by comprising the following steps of: in S4, the thickness of the cement solid brick masonry (9) is 200mm.
6. The method for excavating the foundation pit of the firefighting elevator of the basement of the coastal area building, which is characterized by comprising the following steps of: in S5, the mixture (10) is a mixture of M7.5 cement mortar and building slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310359353.XA CN116180761A (en) | 2023-04-06 | 2023-04-06 | Method for excavating foundation pit of firefighting elevator of building basement in coastal area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310359353.XA CN116180761A (en) | 2023-04-06 | 2023-04-06 | Method for excavating foundation pit of firefighting elevator of building basement in coastal area |
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| Publication Number | Publication Date |
|---|---|
| CN116180761A true CN116180761A (en) | 2023-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310359353.XA Pending CN116180761A (en) | 2023-04-06 | 2023-04-06 | Method for excavating foundation pit of firefighting elevator of building basement in coastal area |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104947677A (en) * | 2014-03-28 | 2015-09-30 | 中国二十冶集团有限公司 | Rapid cofferdam filling construction method for pit in pit |
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2023
- 2023-04-06 CN CN202310359353.XA patent/CN116180761A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104947677A (en) * | 2014-03-28 | 2015-09-30 | 中国二十冶集团有限公司 | Rapid cofferdam filling construction method for pit in pit |
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