CN110670597A - Reasonable excavation method for deep and large foundation pit under water-rich round gravel condition - Google Patents
Reasonable excavation method for deep and large foundation pit under water-rich round gravel condition Download PDFInfo
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- CN110670597A CN110670597A CN201910949296.4A CN201910949296A CN110670597A CN 110670597 A CN110670597 A CN 110670597A CN 201910949296 A CN201910949296 A CN 201910949296A CN 110670597 A CN110670597 A CN 110670597A
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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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Abstract
The invention discloses a reasonable excavation method for a deep and large foundation pit under the condition of water-rich round gravel, which comprises the following steps: step one, excavation preparation: erecting a flooding-proof wall around the foundation pit, arranging a circumferential drainage ditch communicated with the sedimentation tank, dividing a construction layer according to the construction depth, and dividing construction sections according to the construction area; step two, excavating the surface earthwork of the construction section; excavating earthwork on the first construction layer and the second construction layer; excavating earthwork on a third construction layer and a fourth construction layer; fifthly, excavating earthwork on a fifth construction layer and a sixth construction layer; step six, excavating the remaining construction layer earthwork: excavating successively and circularly according to the third step to the fifth step, excavating to 0.2m-0.5m above the bottom of the foundation pit, then excavating the rest earthwork manually, and pouring a concrete foundation cushion layer; seventhly, excavating the earthwork of the rest construction section: and the middle construction section and the two construction sections are gradually constructed according to the steps from the second step to the sixth step. The method can overcome the complex construction environment of the water-rich round gravel, reduce the excavation risk of the foundation pit and improve the construction efficiency.
Description
Technical Field
The invention relates to the field of foundation pit excavation construction, in particular to a reasonable excavation method for a deep and large foundation pit under the condition of water-rich round gravel.
Background
The foundation pit is a soil pit excavated at the design position of the foundation according to the elevation of the foundation and the plane size of the foundation. Before excavation, an excavation scheme is determined according to geological and hydrological data and the conditions of buildings nearby the site, and waterproof drainage work is performed. When a foundation pit is excavated in a zone rich in water round gravel, the problems of uneven soil self-bonding force, poor stability and high soil pressure and water pressure outside the enclosure structure exist, and great risk is caused to excavation of the foundation pit. The invention is designed for overcoming the complex construction environment of water-rich round gravel and reducing the excavation risk of the foundation pit.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the reasonable excavation method for the deep and large foundation pit under the water-rich round gravel condition, which can overcome the complex construction environment of the water-rich round gravel, reduce the excavation risk of the foundation pit and improve the construction efficiency
The technical scheme adopted by the invention for solving the technical problems is as follows:
a reasonable excavation method for a deep and large foundation pit under the condition of water-rich round gravel comprises the following steps:
step one, excavation preparation: erecting a flooding-proof wall around the foundation pit, arranging a circumferential drainage ditch communicated with the sedimentation tank, dividing a construction layer according to the construction depth, and dividing construction sections according to the construction area;
step two, excavating the surface earthwork of the construction section: excavating the earth surface to 1.5-2 m deep by adopting excavating equipment, and then pouring concrete supports;
step three, earth excavation of the first construction layer and the second construction layer: excavating a first construction layer with the thickness of 2.5-3 m and a second construction layer with the thickness of 2.5-3 m by adopting excavating equipment for slope putting in steps, and then installing steel supports;
step four, excavating earthwork on the third construction layer and the fourth construction layer: excavating a third construction layer with the thickness of 2m-2.5m and a fourth construction layer with the thickness of 2m-2.5m by adopting excavating equipment for step-by-step slope release, and then installing steel supports;
fifthly, excavating earthwork on a fifth construction layer and a sixth construction layer: excavating a fifth construction layer with the thickness of 1.5-2 m and a sixth construction layer with the thickness of 1.5-2 m by adopting excavating equipment for slope putting in steps, and then pouring concrete supports;
step six, excavating the remaining construction layer earthwork: excavating successively and circularly according to the third step to the fifth step, excavating to 0.2m-0.5m above the bottom of the foundation pit, then excavating the rest earthwork manually, and pouring a concrete foundation cushion layer;
seventhly, excavating the earthwork of the rest construction section: and the middle construction section and the two construction sections are gradually constructed according to the steps from the second step to the sixth step.
The invention has the beneficial effects that: the construction method has the advantages that the construction is conducted in a segmented and layered mode, the construction layers are excavated in a stepped and sloping mode, the construction sections are excavated from the middle to two sides, the steel supports and the concrete supports are arranged alternately, the stability of the earthwork structure in the excavation process of the foundation pit is guaranteed, the construction is smooth, the complex construction environment of water-rich round gravel is overcome, the excavation risk of the foundation pit is reduced, and the construction efficiency is improved.
In the first step, the height of the flood-proof wall is not less than 5 m.
The beneficial effect of adopting the further technical scheme is that: the waterproof effect of the flood-proof wall is ensured.
In the first step to the sixth step, the excavating equipment is a small hydraulic excavator.
The beneficial effect of adopting the further technical scheme is that: the excavating equipment can be conveniently and quickly constructed on each construction layer.
In the third step, the earth excavation completion time of each step is not more than 16h, and the installation of the steel support or the pouring completion time of the concrete support is not more than 8 h.
The beneficial effect of adopting the further technical scheme is that: guarantee foundation ditch earthwork stable in structure, reduce the excavation risk.
And in the third step, reserving soil dike retaining walls on two sides of the foundation pit excavated by the earthwork in each step, wherein the thickness of the soil dike retaining walls is not less than 3 m.
The beneficial effect of adopting the further technical scheme is that: guarantee foundation ditch earthwork stable in structure, reduce the excavation risk.
In the second step to the sixth step, the gradient of each step is 1: 1.5, the height of the slope is not more than 3 m.
The beneficial effect of adopting the further technical scheme is that: ensuring the excavation efficiency.
And in the second step to the sixth step, chiseling out the bulge of the diaphragm wall in the excavation process, and leveling the bulge by using mortar.
The beneficial effect of adopting the further technical scheme is that: guarantee foundation ditch earthwork stable in structure, reduce the excavation risk.
And step six, pouring the concrete foundation cushion layer within 8 hours after the foundation pit bottom is manually excavated.
The beneficial effect of adopting the further technical scheme is that: guarantee foundation ditch earthwork stable in structure, reduce the excavation risk.
Detailed Description
The following describes embodiments of the present invention in detail. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1
A reasonable excavation method for a deep and large foundation pit under the condition of water-rich round gravel comprises the following steps:
step one, excavation preparation: erecting a flooding-proof wall around the foundation pit, arranging a circumferential drainage ditch communicated with the sedimentation tank, dividing a construction layer according to the construction depth, and dividing construction sections according to the construction area;
step two, excavating the surface earthwork of the construction section: excavating the ground surface to 1.5m deep by adopting excavating equipment, and then pouring concrete supports;
step three, earth excavation of the first construction layer and the second construction layer: excavating a first construction layer with the thickness of 2.5m and a second construction layer with the thickness of 2.5m by adopting excavating equipment for step-by-step slope release, and then installing steel supports;
step four, excavating earthwork on the third construction layer and the fourth construction layer: excavating a third construction layer thickness 2m and a fourth construction layer thickness 2m by adopting excavating equipment for step-by-step slope release, and then installing steel supports;
fifthly, excavating earthwork on a fifth construction layer and a sixth construction layer: excavating a fifth construction layer with the thickness of 1.5m and a sixth construction layer with the thickness of 1.5m by adopting excavating equipment for slope putting in steps, and then pouring concrete supports;
step six, excavating the remaining construction layer earthwork: excavating successively and circularly according to the third step to the fifth step, excavating the rest earthwork manually after excavating to 0.2m above the bottom of the foundation pit, and then pouring a concrete foundation cushion layer;
seventhly, excavating the earthwork of the rest construction section: and the middle construction section and the two construction sections are gradually constructed according to the steps from the second step to the sixth step.
Preferably, in the first step, the height of the flood-proof wall is not less than 5 m.
Preferably, in the first to sixth steps, the excavating equipment is a small hydraulic excavator.
Preferably, in the third step to the sixth step, the earth excavation completion time of each step is not more than 16 hours, and the installation of the steel support or the pouring completion time of the concrete support is not more than 8 hours.
Preferably, in the third step to the seventh step, soil bank retaining walls are reserved on two sides of the foundation pit excavated in each step, and the thickness of each soil bank retaining wall is not less than 3 m.
Preferably, in the second step to the sixth step, each step slope is 1: 1.5, the height of the slope is not more than 3 m.
Preferably, in the second step to the sixth step, the excavation process finds the bulge of the diaphragm wall, namely chiseling, and trowelling the bulge of the diaphragm wall with mortar.
Preferably, in the sixth step, the concrete foundation cushion layer is poured within 8 hours after the foundation pit bottom is manually excavated.
Example 2
A reasonable excavation method for a deep and large foundation pit under the condition of water-rich round gravel comprises the following steps:
step one, excavation preparation: erecting a flooding-proof wall around the foundation pit, arranging a circumferential drainage ditch communicated with the sedimentation tank, dividing a construction layer according to the construction depth, and dividing construction sections according to the construction area;
step two, excavating the surface earthwork of the construction section: excavating the earth surface to 1.8m deep by adopting excavating equipment, and then pouring concrete supports;
step three, earth excavation of the first construction layer and the second construction layer: excavating a first construction layer with the thickness of 2.5m and a second construction layer with the thickness of 2.7m by adopting excavating equipment for step-by-step slope release, and then installing steel supports;
step four, excavating earthwork on the third construction layer and the fourth construction layer: excavating a third construction layer with the thickness of 2m and a fourth construction layer with the thickness of 2.3m by adopting excavating equipment for step-by-step slope release, and then installing steel supports;
fifthly, excavating earthwork on a fifth construction layer and a sixth construction layer: excavating a fifth construction layer with the thickness of 1.5m and a sixth construction layer with the thickness of 1.8m by adopting excavating equipment for slope putting in steps, and then pouring concrete supports;
step six, excavating the remaining construction layer earthwork: excavating successively and circularly according to the third step to the fifth step, excavating the rest earthwork manually after excavating to 0.3m above the bottom of the foundation pit, and then pouring a concrete foundation cushion layer;
seventhly, excavating the earthwork of the rest construction section: and the middle construction section and the two construction sections are gradually constructed according to the steps from the second step to the sixth step.
Preferably, in the first step, the height of the flood-proof wall is not less than 5 m.
Preferably, in the first to sixth steps, the excavating equipment is a small hydraulic excavator.
Preferably, in the third step to the sixth step, the earth excavation completion time of each step is not more than 16 hours, and the installation of the steel support or the pouring completion time of the concrete support is not more than 8 hours.
Preferably, in the third step to the seventh step, soil bank retaining walls are reserved on two sides of the foundation pit excavated in each step, and the thickness of each soil bank retaining wall is not less than 3 m.
Preferably, in the second step to the sixth step, each step slope is 1: 1.5, the height of the slope is not more than 3 m.
Preferably, in the second step to the sixth step, the excavation process finds the bulge of the diaphragm wall, namely chiseling, and trowelling the bulge of the diaphragm wall with mortar.
Preferably, in the sixth step, the concrete foundation cushion layer is poured within 8 hours after the foundation pit bottom is manually excavated.
Example 3
A reasonable excavation method for a deep and large foundation pit under the condition of water-rich round gravel comprises the following steps:
step one, excavation preparation: erecting a flooding-proof wall around the foundation pit, arranging a circumferential drainage ditch communicated with the sedimentation tank, dividing a construction layer according to the construction depth, and dividing construction sections according to the construction area;
step two, excavating the surface earthwork of the construction section: excavating the earth surface to 1.8-2 m deep by adopting excavating equipment, and then pouring concrete supports;
step three, earth excavation of the first construction layer and the second construction layer: excavating a first construction layer with the thickness of 2.8-3 m and a second construction layer with the thickness of 2.8-3 m by adopting excavating equipment for slope putting in steps, and then installing a steel support;
step four, excavating earthwork on the third construction layer and the fourth construction layer: excavating a third construction layer with the thickness of 2.3m and a fourth construction layer with the thickness of 2.5m by adopting excavating equipment for step-by-step slope release, and then installing steel supports;
fifthly, excavating earthwork on a fifth construction layer and a sixth construction layer: excavating a fifth construction layer with the thickness of 1.8m and a sixth construction layer with the thickness of 2m by adopting excavating equipment for slope setting in steps, and then pouring concrete supports;
step six, excavating the remaining construction layer earthwork: excavating successively and circularly according to the third step to the fifth step, excavating the rest earthwork manually after excavating to 0.5m above the bottom of the foundation pit, and then pouring a concrete foundation cushion layer;
seventhly, excavating the earthwork of the rest construction section: and the middle construction section and the two construction sections are gradually constructed according to the steps from the second step to the sixth step.
The invention has the beneficial effects that:
in the first step, the height of the flood-proof wall is not less than 5 m.
In the first step to the sixth step, the excavating equipment is a small hydraulic excavator.
In the third step, the earth excavation completion time of each step is not more than 16h, and the installation of the steel support or the pouring completion time of the concrete support is not more than 8 h.
And in the third step, reserving soil dike retaining walls on two sides of the foundation pit excavated by the earthwork in each step, wherein the thickness of the soil dike retaining walls is not less than 3 m.
In the second step to the sixth step, the gradient of each step is 1: 1.5, the height of the slope is not more than 3 m.
And in the second step to the sixth step, chiseling out the bulge of the diaphragm wall in the excavation process, and leveling the bulge by using mortar.
And step six, pouring the concrete foundation cushion layer within 8 hours after the foundation pit bottom is manually excavated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1. A reasonable excavation method for a deep and large foundation pit under the condition of water-rich round gravel is characterized by comprising the following steps:
step one, excavation preparation: erecting a flooding-proof wall around the foundation pit, arranging a circumferential drainage ditch communicated with the sedimentation tank, dividing a construction layer according to the construction depth, and dividing construction sections according to the construction area;
step two, excavating the surface earthwork of the construction section: excavating the earth surface to 1.5-2 m deep by adopting excavating equipment, and then pouring concrete supports;
step three, earth excavation of the first construction layer and the second construction layer: excavating a first construction layer with the thickness of 2.5-3 m and a second construction layer with the thickness of 2.5-3 m by adopting excavating equipment for slope putting in steps, and then installing steel supports;
step four, excavating earthwork on the third construction layer and the fourth construction layer: excavating a third construction layer with the thickness of 2m-2.5m and a fourth construction layer with the thickness of 2m-2.5m by adopting excavating equipment for step-by-step slope release, and then installing steel supports;
fifthly, excavating earthwork on a fifth construction layer and a sixth construction layer: excavating a fifth construction layer with the thickness of 1.5-2 m and a sixth construction layer with the thickness of 1.5-2 m by adopting excavating equipment for slope putting in steps, and then pouring concrete supports;
step six, excavating the remaining construction layer earthwork: excavating successively and circularly according to the third step to the fifth step, excavating to 0.2m-0.5m above the bottom of the foundation pit, then excavating the rest earthwork manually, and pouring a concrete foundation cushion layer;
seventhly, excavating the earthwork of the rest construction section: and the middle construction section and the two construction sections are gradually constructed according to the steps from the second step to the sixth step.
2. The method for rationally excavating a deep and large foundation pit under the water-rich round gravel condition according to claim 1, wherein in the first step, the height of the flood-proof wall is not less than 5 m.
3. The rational excavation method of a deep and large foundation pit under water-rich round gravel conditions according to claim 1, wherein in the first to sixth steps, the excavation equipment is a small hydraulic excavator.
4. The reasonable excavation method for the deep and large foundation pit under the water-rich round gravel condition according to claim 1, wherein in the third step to the sixth step, the earth excavation completion time of each step is not more than 16 hours, and the installation of the steel support or the pouring completion time of the concrete support is not more than 8 hours.
5. The method for reasonably excavating the deep and large foundation pit under the water-rich round gravel condition according to claim 1, wherein in the third step to the seventh step, soil dike retaining walls are reserved on two sides of the foundation pit excavated in each step, and the thickness of each soil dike retaining wall is not less than 3 m.
6. The reasonable excavation method for the deep and large foundation pit under the water-rich round gravel condition according to claim 1, wherein in the second step to the sixth step, the gradient of each step is 1: 1.5, the height of the slope is not more than 3 m.
7. The method for rationally excavating the deep and large foundation pit under the water-rich round gravel condition according to claim 1, wherein in the second step to the sixth step, the bulge of the diaphragm wall is removed by chiseling and is leveled by mortar.
8. The reasonable excavation method of the deep and large foundation pit under the water-rich round gravel condition according to claim 1, wherein in the sixth step, the concrete foundation cushion layer is poured within 8 hours after the foundation pit bottom is excavated manually.
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2019
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| DE10348077A1 (en) * | 2003-10-13 | 2005-05-04 | Manfred Kaul | Road or rail construction method, by driving sheet piles or infill supports into ground, placing support structure on top and excavating soil underneath |
| KR101042556B1 (en) * | 2010-09-15 | 2011-06-20 | 삼정건설 주식회사 | Fence supporting device for water works |
| CN105421463A (en) * | 2015-11-04 | 2016-03-23 | 中建三局集团有限公司 | Longitudinal excavation construction method of long-span dense-support super-long deep foundation pit |
| CN107313431A (en) * | 2017-08-02 | 2017-11-03 | 中铁隧道集团二处有限公司 | Close on not contour foundation ditch method for synchronously constructing |
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