CN111535328A - Pit shaft type underground garage foundation pit supporting system in water-rich stratum and construction method - Google Patents
Pit shaft type underground garage foundation pit supporting system in water-rich stratum and construction method Download PDFInfo
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- CN111535328A CN111535328A CN202010282842.6A CN202010282842A CN111535328A CN 111535328 A CN111535328 A CN 111535328A CN 202010282842 A CN202010282842 A CN 202010282842A CN 111535328 A CN111535328 A CN 111535328A
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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
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
Abstract
The invention discloses a pit supporting system and a construction method for a pit shaft type underground garage in a water-rich stratum, and aims to provide a pit supporting system which can meet the construction requirements of the pit shaft type underground garage in the water-rich stratum and avoid the infiltration damage of underground water; and the pit supporting structure is stable and reliable, and the pit supporting system and the construction method of the pit shaft type underground garage in the water-rich stratum are adopted. Pit shaft formula underground garage underground structure supporting system in rich water stratum includes: the outer-layer impervious wall is annular and consists of underground water-soil continuous walls; the inner-layer enclosure wall is annular and is positioned on the inner side of the outer-layer impervious wall and consists of reinforced concrete underground continuous walls; the garage lining wall is located on the inner side of the inner layer enclosure wall, the garage lining wall is constructed in the process that a basement of the shaft type underground garage is excavated downwards, and the garage lining wall is tightly attached to the inner layer enclosure wall.
Description
Technical Field
The invention relates to an underground garage foundation pit supporting system, in particular to a shaft type underground garage foundation pit supporting system in a water-rich stratum and a construction method.
Background
In order to solve the problem of 'difficult parking' in old urban areas, some cities begin to build shaft type underground stereo garages by utilizing sporadic land blocks, and the shaft type underground stereo garages are characterized by small occupied area and large depth, and can realize efficient utilization of land by a vertical lifting mode. The common shaft type underground garage comprises a single shaft type and a multi-shaft type, wherein the multi-shaft type mainly comprises two-way and three-way, namely, a basement is divided into two to three cabins through a partition wall. Because the degree of depth of well drum formula garage is great, generally can reach 30~40 meters, the soil and water pressure that receives is great, and its position often is located old city district simultaneously, and the surrounding environment is comparatively complicated, and construction space is narrow and small, consequently has proposed higher requirement to the excavation supporting.
For a shaft type underground garage, the currently adopted foundation pit supporting technology mainly comprises the steps of combining a single row of cast-in-situ bored piles or underground continuous walls with a plurality of horizontal inner supports, and constructing by adopting an open-cut and down-cut method; engineering practice, however, shows that: when the depth of the foundation pit is large, the verticality of the cast-in-place pile and the waterproof curtain behind the cast-in-place pile is difficult to control, so that the waterproof curtain cannot be tightly attached to the cast-in-place pile easily, and a gap is formed between the cast-in-place piles, so that the curtain is cracked and leaked easily in the excavation process. In addition, in water-rich formations, large excavation depths also tend to cause confined water gushes, which if not properly handled, can result in foundation pit flooding or even collapse. Therefore, a reasonable, safe, economic and convenient foundation pit supporting system is provided by combining the structural characteristics of the garage aiming at building a shaft type underground garage in a water-rich stratum.
Disclosure of Invention
The invention aims to provide a method for preventing underground water from permeating and damaging, which can meet the construction requirements of a shaft type underground garage in a water-rich stratum; and the pit supporting structure is stable and reliable, and the pit supporting system and the construction method of the pit shaft type underground garage in the water-rich stratum are adopted.
The technical scheme of the invention is as follows:
a wellbore-type underground garage foundation pit support system in a water-rich formation, comprising: the outer-layer impervious wall is annular and consists of underground water-soil continuous walls; the inner-layer enclosure wall is annular and is positioned on the inner side of the outer-layer impervious wall and consists of reinforced concrete underground continuous walls; the garage lining wall is located on the inner side of the inner layer enclosure wall, the garage lining wall is constructed in the process that a basement of the shaft type underground garage is excavated downwards, and the garage lining wall is tightly attached to the inner layer enclosure wall.
According to the scheme, an outer impervious wall (underground cemented soil continuous wall) and an inner enclosure wall (reinforced concrete underground continuous wall) are matched to form a double waterproof curtain system, so that the problems of leakage and confined water inrush during grooving of the underground diaphragm wall and excavation of a foundation pit can be effectively prevented, the construction requirements of a shaft type underground garage in a water-rich stratum are met, and underground water seepage damage is avoided; meanwhile, the inner-layer enclosure wall (reinforced concrete underground continuous wall) which supports the foundation pit soil pressure is a continuous wall, so that the foundation pit soil pressure can be effectively supported, and the problem of cracking and leakage of the outer-layer impervious wall (underground cement continuous wall) in the foundation pit excavation process can be solved. On the other hand, the garage lining wall is constructed in the process of downward excavation of the basement of the shaft type underground garage, so that the garage lining wall can be tightly attached to the inner-layer enclosure wall, the inner-layer enclosure wall and the garage lining wall are integrated, and the structural stability and the safety of the foundation pit enclosure system are further improved.
Preferably, the garage interior lining wall comprises a plurality of sections of interior lining wall sections which are distributed from top to bottom in sequence, and any two adjacent sections of interior lining wall sections are connected through vertical reserved steel bars. So, the actual construction operation of the interior welt of garage of being convenient for.
Preferably, a water stop steel plate and a water-swelling water stop strip are arranged on an interface between any two adjacent lining wall sections. So, form one stagnant water structure through the interface department of stagnant water steel sheet between two adjacent inside lining wall sections, form the second through meeting the interface department of water inflation sealing rod between two adjacent inside lining wall sections and say stagnant water structure to effectively avoid the interface department between two adjacent inside lining wall sections to take place the seepage.
Preferably, the reinforced concrete underground continuous wall is composed of a reinforcement cage and concrete, the reinforcement cage comprises transverse embedded reinforcements, one part of the transverse embedded reinforcements extends out of the outer side of the inner-layer enclosure wall and is used for being connected with a garage lining wall, and the garage lining wall is connected with the inner-layer enclosure wall through the transverse embedded reinforcements. So, can effectively improve the stability of being connected and the reliability between inlayer enclosure wall and the interior welt of garage, make two walls unifications of inlayer enclosure wall and the interior welt of garage.
Preferably, the enclosure wall further comprises a crown beam, the crown beam is a reinforced concrete beam, the crown beam is positioned at the top of the inner enclosure wall, and the crown beam and the inner enclosure wall are connected into a whole.
Preferably, the garage further comprises a garage partition wall, wherein the garage partition wall is located in a basement of the garage and divides the basement of the garage into a plurality of cabins. So, not only can separate into a plurality of cabin through the garage division wall with the basement in garage, but also can regard as bearing structure through garage division wall self structure to improve support rigidity, be favorable to controlling the foundation ditch and warp, still save material simultaneously.
Preferably, the wall bottom of the outer impervious wall penetrates through the confined aquifer of the ground bottom and extends into the waterproof layer. So, can further prevent that the confined water of diaphragm wall grooving in-process from gushing suddenly, prevent that seepage and confined water from gushing suddenly during the foundation ditch excavation as second way waterproof curtain simultaneously.
Preferably, the wall bottom of the inner enclosure wall penetrates through the confined aquifer of the ground bottom and extends into the water barrier. Therefore, the confined water in the process of forming the groove in the diaphragm wall can be further prevented from gushing.
A construction method of a pit shaft type underground garage foundation pit supporting system in a water-rich stratum is characterized by sequentially comprising the following steps:
firstly, constructing an outer impervious wall, and then carrying out precipitation in a pit;
secondly, constructing an inner layer enclosure wall; because the outer impervious wall (the underground cement soil continuous wall) is additionally arranged outside the inner enclosure wall, and the pit dewatering is carried out before the inner enclosure wall, the stability of the wall of the inner enclosure wall during construction is favorably controlled when the inner enclosure wall (the reinforced concrete underground continuous wall) is constructed, and the actual construction is facilitated;
thirdly, excavating earth to a set elevation, then constructing a crown beam and an inner supporting beam, and oppositely supporting the inner supporting beam on the crown beam;
the fourth step: continuously excavating earthwork downwards to a set elevation, and then constructing corresponding garage lining walls and garage partition walls;
the fifth step: continuously excavating a layer of earthwork downwards, and then constructing corresponding garage lining walls and garage partition walls;
and a sixth step: and returning to the fifth step, continuing construction until earthwork is excavated to the elevation of the substrate, completing construction of the corresponding garage lining wall and the garage partition wall, and then constructing a foundation bottom plate. Because the structures of the garage lining wall and the garage partition wall can be used as a part of a foundation pit supporting system, the supporting rigidity can be improved, the deformation of the foundation pit can be controlled, and meanwhile, the materials are saved.
Preferably, the specific construction method for constructing the inner-layer enclosure wall in the second step sequentially comprises the following steps of:
a, grooving by using a grooving machine;
b, hoisting a steel reinforcement cage and a plurality of vertical guniting pipelines in the groove, wherein the vertical guniting pipelines are sequentially distributed along the length direction of the groove, the vertical guniting pipelines are positioned on the outer side of the steel reinforcement cage and are close to or abut against the outer wall of the groove, the lower end of each vertical guniting pipe is closed, the upper end of each vertical guniting pipe is provided with a grouting opening, the side wall of each vertical guniting pipe is provided with a plurality of guniting holes which are sequentially distributed from top to bottom, the guniting holes face to the outer impervious wall, and the guniting holes are close to or abut against the outer wall of the groove; then, casting concrete in the groove;
and c, after the concrete in the groove is solidified, injecting the concrete into the vertical guniting pipe through the grouting port, and spraying the concrete through the guniting hole, so that a plurality of concrete support columns which are sequentially distributed from top to bottom are formed in the soil layer between the inner enclosure wall and the outer impervious wall, and the inner enclosure wall and the outer impervious wall are connected through the concrete support columns. Therefore, the soil pressure of the foundation pit borne by the outer impervious wall (underground cement continuous wall) can be transmitted to the inner enclosing wall (reinforced concrete underground continuous wall) through the concrete support columns, and the soil pressure of the foundation pit is borne by the inner enclosing wall (reinforced concrete underground continuous wall), so that the problem of cracking and leakage of the outer impervious wall (underground cement continuous wall) in the excavation process of the foundation pit is further effectively avoided.
The invention has the beneficial effects that: the construction requirements of a shaft type underground garage in a water-rich stratum can be met, and underground water seepage damage is avoided; and the foundation pit supporting structure is stable and reliable.
Drawings
Fig. 1 is a schematic structural diagram of a pit support system of a shaft type underground garage in a water-rich stratum.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a schematic cross-sectional view taken along line a-a in fig. 1.
Fig. 4 is a schematic view of a partial connection structure of the garage lining wall and the inner enclosure wall according to the present invention.
In the figure:
an outer impervious wall 1;
an inner enclosure wall 2;
a crown beam 3;
an inner support beam 4;
a garage interior lining wall 5;
a garage dividing wall 6;
a foundation sole plate 7;
transversely embedding reinforcing steel bars 8;
a water stop steel plate 9;
a water-swellable seal 10.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly explained and illustrated below with reference to the accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present scheme, and are not construed as limiting the scheme of the present invention.
These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be practiced, but it is understood that the scope of the embodiments of the invention is not limited thereby. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., and "several" means one or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The first embodiment is as follows: as shown in fig. 1, fig. 2 and fig. 3, a shaft type underground garage foundation pit supporting system in a water-rich stratum comprises: an outer impervious wall 1, an inner enclosure wall 2 and a garage lining wall 5. The outer impervious wall is annular and consists of underground water-soil continuous walls. The inner-layer enclosure wall is annular and is positioned on the inner side of the outer-layer impervious wall. The inner layer enclosure wall is composed of reinforced concrete underground continuous walls. The garage lining wall is located on the inner side of the inner-layer enclosure wall, the garage lining wall is constructed in the process of downward excavation of a basement of the shaft type underground garage, and the garage lining wall is tightly attached to the inner-layer enclosure wall.
In the embodiment, an outer impervious wall (underground cemented soil continuous wall) and an inner enclosure wall (reinforced concrete underground continuous wall) are matched to form a double waterproof curtain system, so that the problems of leakage and confined water inrush during grooving of the underground continuous wall and excavation of a foundation pit can be effectively prevented, the construction requirement of a shaft type underground garage in a water-rich stratum is met, and the underground water is prevented from being damaged by permeation; meanwhile, the inner-layer enclosure wall (reinforced concrete underground continuous wall) which supports the foundation pit soil pressure is a continuous wall, so that the foundation pit soil pressure can be effectively supported, and the problem of cracking and leakage of the outer-layer impervious wall (underground cement continuous wall) in the foundation pit excavation process can be solved. On the other hand, the garage lining wall is constructed in the process of downward excavation of the basement of the shaft type underground garage, so that the garage lining wall can be tightly attached to the inner-layer enclosure wall, the inner-layer enclosure wall and the garage lining wall are integrated, and the structural stability and the safety of the foundation pit enclosure system are further improved.
Further, as shown in fig. 1 and 2, the shaft type underground garage foundation pit supporting system in the water-rich stratum further comprises a crown beam 3. The top beam is a reinforced concrete beam and is positioned at the top of the inner enclosure wall, and the top beam and the inner enclosure wall are connected into a whole. Therefore, the structural stability of the enclosure wall can be further improved.
Further, as shown in fig. 1 and 3, the shaft type underground garage foundation pit supporting system in the water-rich stratum also comprises a garage partition wall 6. In this embodiment, the garage division wall is twice, and the garage division wall is located the basement in garage, separates into 3 cabins with the basement in garage. So, not only can separate into a plurality of cabin through the garage division wall with the basement in garage, but also can regard as bearing structure through garage division wall self structure to improve support rigidity, be favorable to controlling the foundation ditch and warp, still save material simultaneously.
Further, as shown in fig. 1, 3 and 4, the reinforced concrete underground continuous wall is composed of a reinforcement cage and concrete; the steel reinforcement cage includes horizontal embedded steel 8, and partly stretch out the outside of inlayer enclosure wall in the horizontal embedded steel for connect the garage interior welt. The garage interior lining wall is connected with the inner enclosure wall through the transverse embedded steel bars. In this embodiment, the interior wall of garage is reinforced concrete wall. So, can effectively improve the stability of being connected and the reliability between inlayer enclosure wall and the interior welt of garage, make two walls unifications of inlayer enclosure wall and the interior welt of garage.
Further, as shown in fig. 1, 3, and 4, the garage interior lining wall includes a plurality of interior lining wall sections distributed in sequence from top to bottom, and any two adjacent interior lining wall sections are connected by vertical reserved steel bars. So, the actual construction operation of the interior welt of garage of being convenient for.
And a water stop steel plate 9 and a water-swelling water stop strip 10 are arranged on the interface between any two adjacent lining wall sections. So, form one stagnant water structure through the interface department of stagnant water steel sheet between two adjacent inside lining wall sections, form the second through meeting the interface department of water inflation sealing rod between two adjacent inside lining wall sections and say stagnant water structure to effectively avoid the interface department between two adjacent inside lining wall sections to take place the seepage. During construction, the interface between any two adjacent lining wall sections needs to be roughened.
Furthermore, the wall bottom of the outer impervious wall penetrates through the confined aquifer of the ground bottom and extends into the waterproof layer. So, can further prevent that the confined water of diaphragm wall grooving in-process from gushing suddenly, prevent that seepage and confined water from gushing suddenly during the foundation ditch excavation as second way waterproof curtain simultaneously.
Furthermore, the wall bottom of the inner layer enclosure wall penetrates through the confined aquifer of the ground bottom and extends into the waterproof layer. Therefore, leakage and confined water inrush during foundation pit excavation can be further prevented.
In a concrete embodiment, a construction method of a pit supporting system of a pit shaft type underground garage in a water-rich stratum refers to the concrete embodiment.
A construction method of a pit supporting system of a pit shaft type underground garage in a water-rich stratum sequentially comprises the following steps:
firstly, constructing an outer-layer impervious wall 1, specifically, constructing the outer-layer impervious wall by adopting a TRD method, namely constructing an underground cement-soil continuous wall; then, carrying out precipitation in the pit;
secondly, constructing an inner layer enclosure wall 2, namely constructing a reinforced concrete underground continuous wall; because the outer impervious wall (the underground cement soil continuous wall) is additionally arranged outside the inner enclosure wall, and the pit dewatering is carried out before the inner enclosure wall, the stability of the wall of the inner enclosure wall during construction is favorably controlled when the inner enclosure wall (the reinforced concrete underground continuous wall) is constructed, and the actual construction is facilitated;
thirdly, excavating the earthwork to the underground elevation of 1.5 meters; then, constructing a crown beam 3 and an inner supporting beam 4, and oppositely supporting the inner supporting beam on the crown beam; in the embodiment, the crown beam is a reinforced concrete beam, and the inner supporting beam is a reinforced concrete beam or a steel beam;
the fourth step: continuously excavating earthwork downwards to the elevation of 9 m underground, and then constructing a garage lining wall 5 and a garage partition wall 6 which are 4-8 m underground;
the fifth step: continuously excavating a layer of earthwork downwards, wherein the thickness of the layer of earthwork is 4 meters; then, constructing corresponding garage lining walls and garage partition walls downwards, namely constructing the garage lining walls and the garage partition walls in the layer;
and a sixth step: and returning to the fifth step, continuing construction until earthwork is excavated to the elevation of the substrate, completing construction of the corresponding garage lining wall and the garage partition wall, and then constructing a foundation bottom plate 7. Because the structures of the garage lining wall and the garage partition wall can be used as a part of a foundation pit supporting system, the supporting rigidity can be improved, the deformation of the foundation pit can be controlled, and meanwhile, the materials are saved.
Seventhly, dismantling the inner supporting beam;
eighth step: constructing a garage lining wall and a garage partition wall which are 0-4 meters underground; and then constructing a top plate.
In this embodiment, the specific construction method for constructing the inner enclosure wall in the second step sequentially includes the following steps:
a, grooving by using a grooving machine;
b, hoisting a steel reinforcement cage and a plurality of vertical guniting pipelines in the groove, wherein the vertical guniting pipelines are sequentially distributed at equal intervals along the length direction of the groove, the vertical guniting pipelines are positioned on the outer side of the steel reinforcement cage and abut against the outer wall of the groove, and in the embodiment, the outer wall of the groove refers to the side wall of the groove close to the outer impervious wall; the lower end of the vertical guniting pipe is closed, the upper end of the vertical guniting pipe is provided with a grouting opening, the side wall of the vertical guniting pipe is provided with a plurality of guniting holes which are sequentially distributed from top to bottom, the guniting holes face the outer impervious wall, and the guniting holes are abutted against the outer wall of the groove; then, casting concrete in the groove;
and c, after the concrete in the groove is solidified, injecting the concrete into the vertical guniting pipe through the grouting port, and spraying the concrete through the guniting hole, so that a plurality of concrete support columns which are sequentially distributed from top to bottom are formed in the soil layer between the inner enclosure wall and the outer impervious wall, and the inner enclosure wall and the outer impervious wall are connected through the concrete support columns. Therefore, the soil pressure of the foundation pit borne by the outer impervious wall (underground cement continuous wall) can be transmitted to the inner enclosing wall (reinforced concrete underground continuous wall) through the concrete support columns, and the soil pressure of the foundation pit is borne by the inner enclosing wall (reinforced concrete underground continuous wall), so that the problem of cracking and leakage of the outer impervious wall (underground cement continuous wall) in the excavation process of the foundation pit is further effectively avoided.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a pit shaft formula underground garage underground structure excavation supporting system in rich water stratum which characterized by includes:
the outer-layer impervious wall is annular and consists of underground water-soil continuous walls;
the inner-layer enclosure wall is annular and is positioned on the inner side of the outer-layer impervious wall and consists of reinforced concrete underground continuous walls;
the garage lining wall is located on the inner side of the inner layer enclosure wall, the garage lining wall is constructed in the process that a basement of the shaft type underground garage is excavated downwards, and the garage lining wall is tightly attached to the inner layer enclosure wall.
2. The pit supporting system for the pit shaft type underground garage in the water-rich stratum as claimed in claim 1, wherein the garage lining wall comprises a plurality of lining wall sections distributed sequentially from top to bottom, and any two adjacent lining wall sections are connected through vertical reserved steel bars.
3. The shaft type underground garage foundation pit supporting system in the water-rich stratum as claimed in claim 2, wherein the interface between any two adjacent sections of the lining wall sections is provided with a water stop steel plate and a water-swelling water stop bar.
4. The shaft type underground garage foundation pit supporting system in the water-rich stratum as claimed in claim 1, 2 or 3, wherein the reinforced concrete underground continuous wall is composed of a reinforcement cage and concrete, the reinforcement cage comprises transverse embedded steel bars, a part of the transverse embedded steel bars extends out of the inner enclosure wall and is used for connecting a garage lining wall, and the garage lining wall is connected with the inner enclosure wall through the transverse embedded steel bars.
5. The pit supporting system for the pit shaft type underground garage in the water-rich stratum as claimed in claim 1, 2 or 3, further comprising a top beam, wherein the top beam is a reinforced concrete beam and is positioned on the top of the inner enclosure wall, and the top beam and the inner enclosure wall are connected into a whole.
6. The pit supporting system of the pit shaft type underground garage in the water-rich stratum as claimed in claim 1, 2 or 3, further comprising a garage partition wall, wherein the garage partition wall is positioned in the underground chamber of the garage to divide the basement of the garage into a plurality of cabins.
7. The pit supporting system for the pit shaft type underground garage in the water-rich stratum as claimed in claim 1, 2 or 3, wherein the wall bottom of the outer impervious wall penetrates through a confined aquifer of the ground bottom and extends into the water-proof layer.
8. The shaft type underground garage foundation pit supporting system in the water-rich stratum according to claim 1, 2 or 3, wherein the wall bottom of the inner layer enclosure wall penetrates through a confined aquifer of the ground bottom and extends into the water-resisting layer.
9. A method of constructing a pit supporting system for a shaft type underground garage in a water-rich stratum according to claim 1, which comprises the following steps in sequence:
firstly, constructing an outer impervious wall, and then carrying out precipitation in a pit;
secondly, constructing an inner layer enclosure wall;
thirdly, excavating earth to a set elevation, then constructing a crown beam and an inner supporting beam, and oppositely supporting the inner supporting beam on the crown beam;
the fourth step: continuously excavating earthwork downwards to a set elevation, and then constructing corresponding garage lining walls and garage partition walls;
the fifth step: continuously excavating a layer of earthwork downwards, and then constructing corresponding garage lining walls and garage partition walls;
and a sixth step: and returning to the fifth step, continuing construction until earthwork is excavated to the elevation of the substrate, completing construction of the corresponding garage lining wall and the garage partition wall, and then constructing a foundation bottom plate.
10. The construction method of the pit supporting system of the shaft type underground garage in the water-rich stratum as claimed in claim 9, wherein the concrete construction method of constructing the inner enclosure wall in the second step sequentially comprises the following steps:
a, grooving by using a grooving machine;
b, hoisting a steel reinforcement cage and a plurality of vertical guniting pipelines in the groove, wherein the vertical guniting pipelines are sequentially distributed along the length direction of the groove, the vertical guniting pipelines are positioned on the outer side of the steel reinforcement cage and are close to or abut against the outer wall of the groove, the lower end of each vertical guniting pipe is closed, the upper end of each vertical guniting pipe is provided with a grouting opening, the side wall of each vertical guniting pipe is provided with a plurality of guniting holes which are sequentially distributed from top to bottom, the guniting holes face to the outer impervious wall, and the guniting holes are close to or abut against the outer wall of the groove; then, casting concrete in the groove;
and c, after the concrete in the groove is solidified, injecting the concrete into the vertical guniting pipe through the grouting port, and spraying the concrete through the guniting hole, so that a plurality of concrete support columns which are sequentially distributed from top to bottom are formed in the soil layer between the inner enclosure wall and the outer impervious wall, and the inner enclosure wall and the outer impervious wall are connected through the concrete support columns.
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| CN112196335A (en) * | 2020-09-29 | 2021-01-08 | 南京理工大学紫金学院 | Annular underground garage and construction method thereof |
| CN113338947A (en) * | 2021-04-14 | 2021-09-03 | 浙江交工集团股份有限公司 | Sand-flowing-preventing water-gushing working well for water-rich sand layer and construction method thereof |
| CN115288146A (en) * | 2022-01-11 | 2022-11-04 | 浙江理工大学 | Supporting structure and construction method of pit continuous waterproof wall |
| CN115288189A (en) * | 2022-01-11 | 2022-11-04 | 浙江理工大学 | Construction method of pit-well type stereo garage |
| CN115354684A (en) * | 2022-01-11 | 2022-11-18 | 浙江理工大学 | Waterproof maintenance system of pit well type stereo garage |
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| CN113338947A (en) * | 2021-04-14 | 2021-09-03 | 浙江交工集团股份有限公司 | Sand-flowing-preventing water-gushing working well for water-rich sand layer and construction method thereof |
| CN113338947B (en) * | 2021-04-14 | 2024-04-09 | 浙江交工集团股份有限公司 | Water-rich sand layer anti-flowing sand water-surge working well and construction method thereof |
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