CN111441361A - Pit enclosure system of shaft type underground stereo garage and construction method - Google Patents
Pit enclosure system of shaft type underground stereo garage and construction method Download PDFInfo
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- CN111441361A CN111441361A CN202010147182.0A CN202010147182A CN111441361A CN 111441361 A CN111441361 A CN 111441361A CN 202010147182 A CN202010147182 A CN 202010147182A CN 111441361 A CN111441361 A CN 111441361A
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
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Abstract
The invention discloses a pit enclosure system of a shaft type underground stereo garage and a construction method, aiming at providing a pit enclosure system which can not only meet the construction requirements of deep pits in urban complex environments and narrow sites; and the foundation pit enclosure system and the construction method of the shaft type underground stereo garage are convenient to construct and stable and reliable in enclosure structure. Pit shaft formula underground stereo garage's foundation ditch enclosure system includes: the enclosure wall is annular and consists of a plurality of cast-in-situ bored piles which are sequentially arranged and distributed, any two adjacent cast-in-situ bored piles are mutually occluded, each cast-in-situ bored pile comprises a plain concrete cast-in-situ bored pile and a reinforced concrete cast-in-situ bored pile, and the plain concrete cast-in-situ bored piles and the reinforced concrete cast-in-situ bored piles are sequentially and alternately arranged and distributed; the garage outer wall is located the enclosure wall inboard, and the garage outer wall is under construction at the downward in-process of excavating of pit shaft formula underground stereo garage's basement to make the garage outer wall hug closely the enclosure wall.
Description
Technical Field
The invention relates to a foundation pit enclosure system, in particular to a foundation pit enclosure system of a shaft type underground stereo garage and a construction method.
Background
With the rapid development of social economy, the living standard of people is continuously improved, the number of motor vehicles in cities is rapidly increased, and the problem of difficult parking is increasingly highlighted. The shaft type underground stereo garage is built by utilizing sporadic land blocks in cities, and the method is an effective method for relieving the problem of difficult parking. The foundation pit of the shaft type underground stereo garage generally has the characteristics of small plane size, large vertical depth, complex surrounding environment, narrow construction space and the like.
For a foundation pit with a large excavation depth, a conventional feasible enclosure system mainly comprises a single row of cast-in-situ bored piles or an underground continuous wall combined with a plurality of horizontal inner supports, and is constructed by adopting an open-cut progressive method; when the planar shape of the foundation pit is circular, a plurality of annular purlins can be arranged to serve as a supporting system. However, the row pile enclosure structure needs to be additionally provided with a waterproof curtain, when the depth of a foundation pit is large, the verticality of a bored pile and the waterproof curtain is difficult to control, and the waterproof curtain is easy to be not attached to the bored pile, so that the problem that the curtain is cracked and leaked in the excavation process is caused; the diaphragm wall integrates soil retaining and water intercepting and can also be used as a permanent structure, but has high requirements on grooving technology and wall body lap joint part connecting technology in construction, higher manufacturing cost and large construction land occupation. Therefore, a safe, economic and convenient-to-construct foundation pit enclosure system is needed to be provided by combining the structural characteristics of the shaft type underground stereo garage.
Disclosure of Invention
The invention aims to provide a method for constructing a deep foundation pit in a complex urban environment and a narrow site; and the foundation pit enclosure system and the construction method of the shaft type underground stereo garage are convenient to construct and stable and reliable in enclosure structure.
The technical scheme of the invention is as follows:
a pit enclosure system of a shaft type underground stereo garage comprises: the enclosure wall is annular and consists of a plurality of cast-in-situ bored piles which are sequentially arranged and distributed, any two adjacent cast-in-situ bored piles are mutually occluded, each cast-in-situ bored pile comprises a plain concrete cast-in-situ bored pile and a reinforced concrete cast-in-situ bored pile, and the plain concrete cast-in-situ bored piles and the reinforced concrete cast-in-situ bored piles are sequentially and alternately arranged and distributed; the garage outer wall is located the enclosure wall inboard, and the garage outer wall is under construction at the downward in-process of excavating of pit shaft formula underground stereo garage's basement to make the garage outer wall hug closely the enclosure wall.
In the scheme, the occlusive pile enclosure structure is adopted, so that the effects of soil retaining and water stopping are achieved, a water stopping curtain does not need to be arranged independently, the corresponding construction equipment is small in size, the occupied area for construction is small, and the construction is convenient; the construction requirements of deep foundation pits in urban complex environments and narrow sites can be met; meanwhile, compared with the common cast-in-situ bored pile enclosure structure, the secant pile enclosure structure greatly improves the shear strength, the structural stability and the safety of the enclosure structure. On the other hand, the outer wall of the garage is constructed in the process of downward excavation of the basement of the shaft type underground three-dimensional garage, so that the outer wall of the garage can be tightly attached to the enclosure wall, the gap between the enclosure wall and the outer wall of the garage at the moment is avoided, and the structural stability and the safety of a foundation pit enclosure system can be further improved.
Preferably, the reinforced concrete bored pile comprises a long pile and a short pile, wherein the short pile has the same length as the plain concrete bored pile, and the length of the long pile is greater than that of the short pile. The long pile in the scheme can be used as part of the enclosure structure and also used as a stand column pile for supporting the weight of the upper wall structure before the construction of the shaft type underground stereo garage is completed, so that the arrangement of an independent stand column pile and the reduction of the inner support can be avoided, engineering materials are saved, and the construction space inside the foundation pit is enlarged.
Preferably, the long piles are distributed in sequence at equal intervals, and at least one short pile is distributed between any two adjacent long piles.
Preferably, the cast-in-situ bored pile further comprises a crown beam, wherein the crown beam is a reinforced concrete beam and is positioned at the top of the enclosure wall, and the crown beam connects the tops of the bored cast-in-situ bored piles into a whole. Therefore, the structural stability of the enclosure wall can be further improved.
Preferably, the crown beam is also connected to the top of the outer wall of the garage. Therefore, the top of the garage outer wall and the top of the enclosure wall can be connected into a whole, and the structural stability of the foundation pit enclosure system is further improved.
Preferably, reinforced concrete drilling bored concrete pile comprises steel reinforcement cage and concrete, and the steel reinforcement cage includes horizontal embedded steel bar, and partly stretch out the outside of reinforced concrete drilling bored concrete pile in the horizontal embedded steel bar for connect the garage outer wall, the garage outer wall is connected with reinforced concrete drilling bored concrete pile through horizontal embedded steel bar. So, can effectively improve connection stability and reliability between reinforced concrete drilling bored concrete pile and the garage outer wall.
Preferably, the garage outer wall comprises a plurality of outer wall sections which are distributed from top to bottom in sequence, and any two adjacent outer wall sections are connected through vertical reserved steel bars.
A construction method of a foundation pit enclosure system of a shaft type underground stereo garage is characterized by sequentially comprising the following steps:
the construction of the enclosure wall comprises the following steps,
firstly, constructing a plain concrete cast-in-situ bored pile;
secondly, constructing a reinforced concrete cast-in-situ bored pile;
constructing a crown beam, wherein the crown beam is a reinforced concrete beam and is positioned at the top of the enclosure wall, and the crown beam connects the tops of the cast-in-situ bored piles into a whole;
and (III) constructing an outer wall of the garage, wherein the outer wall of the garage is constructed in the process of downward excavation of the basement of the shaft type underground stereo garage, so that the outer wall of the garage is tightly attached to the enclosure wall.
A construction method of a foundation pit enclosure system of a shaft type underground stereo garage is characterized by sequentially comprising the following steps:
the construction of the enclosure wall comprises the following steps,
firstly, constructing a plain concrete cast-in-situ bored pile;
secondly, construction reinforced concrete drilling bored concrete pile include construction long pile and stub, wherein the construction long pile includes following step:
firstly, drilling a hole between two adjacent plain concrete cast-in-situ bored piles to form a long pile hole;
then, a hole bottom expanding device is adopted to expand the hole bottom of the long pile hole, the hole bottom expanding device comprises a central vertical cylinder, a closed inner cavity arranged in the central vertical cylinder, a first explosion initiating device arranged in the closed inner cavity, a plurality of radial cylinders arranged on the outer wall of the central vertical cylinder and an explosion type reamer arranged in the radial cylinders in a sliding mode, the radial cylinders extend in the radial direction of the central vertical cylinder, the inner holes of the radial cylinders are communicated with the closed inner cavity, the explosion type reamer comprises a drilling soil shell arranged in the radial cylinders in a sliding mode and a second explosion initiating device arranged in the drilling soil shell, a conical drill bit is arranged at one end, far away from the closed inner cavity, of the drilling soil shell, and a plurality of side wall notches are formed in the side wall of the drilling soil shell;
the specific steps of reaming the hole bottom of the long pile drilled hole by adopting the hole bottom expanding device comprise:
a, a hole bottom expanding device is placed at the hole bottom of a long pile hole by a connecting rope; b, detonating the first detonation device to enable the blasting reamers in the radial cylinders to be ejected into a sidewall soil layer at the hole bottom of the long pile hole; c, detonating by a second detonating device so as to ream the hole bottom of the long pile hole;
then, hoisting the reinforcement cage into the pile hole of the long pile, and then pouring concrete to form a reinforced concrete cast-in-situ bored pile;
because the hole bottom of the long pile hole is reamed through the hole bottom expanding device before the concrete is poured, after the poured concrete forms the reinforced concrete bored pile, the bottom of the long pile forms reliable support, the bearing capacity of the long pile as a vertical pile is greatly improved, the weight of an upper wall structure is supported before the construction of the shaft type underground stereo garage is completed, and the stable and reliable structure of a foundation pit enclosure system is ensured.
Constructing a crown beam, wherein the crown beam is a reinforced concrete beam and is positioned at the top of the enclosure wall, and the crown beam connects the tops of the cast-in-situ bored piles into a whole;
and (III) constructing an outer wall of the garage, wherein the outer wall of the garage is constructed in the process of downward excavation of the basement of the shaft type underground stereo garage, so that the outer wall of the garage is tightly attached to the enclosure wall.
The invention has the beneficial effects that: the construction requirements of deep foundation pits in urban complex environments and narrow sites can be met; and has the characteristics of convenient construction and stable and reliable enclosure structure.
Drawings
Fig. 1 is a top view of a circular enclosure wall of a foundation pit enclosure system of a shaft-type underground stereo garage according to an embodiment of the present invention.
Fig. 2 is a top view of a rectangular enclosure wall of a foundation pit enclosure system of a shaft-type underground stereo garage according to an embodiment of the present invention.
Fig. 3 is a side view of a pit enclosure system of a shaft-type underground stereo garage according to a first embodiment of the invention.
Fig. 4 is a schematic partial sectional structure view of a foundation pit enclosure system of a shaft-type underground stereo garage according to an embodiment of the present invention.
Fig. 5 is a schematic view of a local connection structure between an outer wall of a garage of a foundation pit enclosure system of a pit-shaft type underground stereo garage and a reinforced concrete cast-in-situ bored pile according to a first embodiment of the present invention.
Fig. 6 is a schematic cross-sectional view of a downhole expansion tool according to a third embodiment of the present invention.
Fig. 7 is a top view of the bottom of a long pile according to a third embodiment of the present invention.
In the figure:
the method comprises the following steps of 1, 1.1 of a surrounding wall, 1.2 of a plain concrete bored pile, 1.21 of a long pile, 1.22 of a short pile and 1.23 of transverse embedded steel bars;
a garage outer wall 2;
a crown beam 3;
a bottom structural foundation 4;
a top plate 5;
the hole bottom expanding device comprises a hole bottom expanding device 6, a central vertical cylinder 6.1, a closed inner cavity 6.2, a first detonating device 6.3, a radial cylinder 6.4, a blasting type reamer 6.5, a conical drill bit 6.51, a second detonating device 6.52, a side wall notch 6.53 and an inner limiting block 6.6.
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, 2 and 3, a pit enclosure system of a shaft type underground stereo garage comprises an enclosure wall 1 and a garage outer wall 2. The enclosure wall is annular, for example, circular or rectangular in cross-section. The enclosure wall is composed of a plurality of cast-in-situ bored piles which are sequentially arranged and distributed, and any two adjacent cast-in-situ bored piles are mutually occluded. The cast-in-situ bored pile comprises a plain concrete cast-in-situ bored pile 1.1 and a reinforced concrete cast-in-situ bored pile 1.2, wherein the plain concrete cast-in-situ bored pile and the reinforced concrete cast-in-situ bored pile are sequentially and alternately arranged and distributed. The plain concrete cast-in-situ bored pile is made of concrete. The reinforced concrete bored pile is composed of a reinforcement cage and concrete. The garage outer wall 2 is located the enclosure wall inboard, and the garage outer wall is under construction at the downward in-process of excavating of pit shaft formula underground stereo garage's basement to make the garage outer wall hug closely the enclosure wall.
In the embodiment, the occlusive pile enclosure structure is adopted, so that the effects of soil retaining and water stopping are achieved, a water-stopping curtain does not need to be arranged independently, the corresponding construction equipment is small in size, the occupied area for construction is small, the construction is convenient, and the construction requirements of deep foundation pits in complex urban environments and narrow sites can be met; meanwhile, compared with the common cast-in-situ bored pile enclosure structure, the secant pile enclosure structure greatly improves the shear strength, the structural stability and the safety of the enclosure structure. On the other hand, the outer wall of the garage is constructed in the process of downward excavation of the basement of the shaft type underground three-dimensional garage, so that the outer wall of the garage can be tightly attached to the enclosure wall, the gap between the enclosure wall and the outer wall of the garage at the moment is avoided, and the structural stability and the safety of a foundation pit enclosure system can be further improved.
In this embodiment, as shown in fig. 4, the garage exterior wall 2 includes a plurality of exterior wall sections distributed from top to bottom in sequence, and any two adjacent exterior wall sections are connected by vertical reserved steel bars. In actual construction, the downward excavation mode of the basement of the shaft type underground stereo garage adopts a mode of downward layered excavation in sequence, and one section of outer wall section is constructed when one layer is excavated downwards.
Further, as shown in fig. 3, the reinforced concrete bored pile 1.2 includes a long pile 1.21 and a short pile 1.22, wherein the short pile has the same length as the plain concrete bored pile, and the long pile has a length greater than that of the short pile. The long pile in the scheme can be used as part of the enclosure structure and also used as a stand column pile for supporting the weight of the upper wall structure before the construction of the shaft type underground stereo garage is completed, so that the arrangement of an independent stand column pile and the reduction of the inner support can be avoided, engineering materials are saved, and the construction space inside the foundation pit is enlarged.
The long piles are distributed in sequence at equal intervals, and two short piles are distributed between any two adjacent long piles.
Further, as shown in fig. 5, the reinforcement cage includes transverse embedded reinforcements 1.23, and a part of the transverse embedded reinforcements extend out of the reinforced concrete bored pile to be connected with the garage outer wall 2; the garage outer wall is connected with the reinforced concrete cast-in-situ bored pile through the transverse embedded steel bars. So, can effectively improve connection stability and reliability between reinforced concrete drilling bored concrete pile and the garage outer wall.
Further, as shown in fig. 4, the foundation pit enclosure system of the shaft-type underground stereo garage further includes a crown beam 3. The crown beam is a reinforced concrete beam. The top beam is positioned at the top of the enclosure wall and connects the tops of the cast-in-situ bored piles into a whole. Therefore, the structural stability of the enclosure wall can be further improved.
The crown beam is also connected to the top of the garage outer wall 2. In this embodiment, the crown beam is pre-buried with vertical connecting steel bars, and the top of the garage outer wall is connected with the crown beam through the vertical connecting steel bars. Therefore, the top of the garage outer wall and the top of the enclosure wall can be connected into a whole, and the structural stability of the foundation pit enclosure system is further improved.
Further, as shown in fig. 4, the foundation pit enclosure system of the shaft-type underground stereo garage further includes a top plate 5 and a bottom structure foundation 4.
The second embodiment is as follows: a construction method of a foundation pit enclosure system of a shaft type underground stereo garage refers to the specific structure of the foundation pit enclosure system of the shaft type underground stereo garage according to the first specific embodiment.
The construction method of the foundation pit enclosure system of the shaft type underground stereo garage sequentially comprises the following steps:
the construction of the enclosure wall comprises the following steps,
firstly, constructing a plain concrete cast-in-situ bored pile, specifically, firstly, drilling a hole at a specified place to form a pile hole; then, pouring concrete to form a plain concrete cast-in-situ bored pile;
secondly, constructing the reinforced concrete cast-in-situ bored pile, specifically, firstly, drilling a hole between two adjacent plain concrete cast-in-situ bored piles to form a pile hole; then, hoisting the reinforcement cage into the pile hole, and then pouring concrete to form a reinforced concrete cast-in-situ bored pile;
constructing a crown beam, wherein the crown beam is a reinforced concrete beam and is positioned at the top of the enclosure wall, and the crown beam connects the tops of the cast-in-situ bored piles into a whole;
and (III) constructing an outer wall of the garage, wherein the outer wall of the garage is constructed in the process of downward excavation of the basement of the shaft type underground stereo garage, so that the outer wall of the garage is tightly attached to the enclosure wall. In this embodiment, the manner of excavating the basement of the shaft-type underground stereo garage downward is a sequential downward layered excavation manner, and a section of outer wall section is constructed every time one layer is excavated downward. Any two adjacent outer wall sections are connected through vertical reserved steel bars, and the joint surface of any two adjacent outer wall sections needs to be roughened.
And (IV) after the basement of the shaft type underground stereo garage is dug downwards to the pit bottom, constructing a bottom structure foundation of the pit bottom and a top plate positioned above the crown beam.
The third concrete embodiment: a construction method of a foundation pit enclosure system of a shaft type underground stereo garage refers to the specific structure of the foundation pit enclosure system of the shaft type underground stereo garage according to the first specific embodiment.
The construction method of the foundation pit enclosure system of the shaft type underground stereo garage sequentially comprises the following steps:
the construction of the enclosure wall comprises the following steps,
firstly, constructing a plain concrete cast-in-situ bored pile, specifically, firstly, drilling a hole at a specified place to form a pile hole; then, pouring concrete to form a plain concrete cast-in-situ bored pile;
secondly, construction reinforced concrete drilling bored concrete pile include construction long pile and stub, wherein the construction long pile includes following step:
firstly, drilling a hole between two adjacent plain concrete cast-in-situ bored piles to form a long pile hole;
and then, reaming the hole bottom of the long pile hole by using a hole bottom expanding device. As shown in fig. 6, the hole bottom expanding device 6 includes a central vertical cylinder 6.1, a sealed inner cavity 6.2 disposed in the central vertical cylinder, a first explosive device 6.3 disposed in the sealed inner cavity, four radial cylinders 6.4 disposed on the outer wall of the central vertical cylinder, and an explosive reamer 6.5 slidably disposed in the radial cylinders. The radial cylinder body extends along the radial direction of the central vertical cylinder body, and an inner hole of the radial cylinder body is communicated with the closed inner cavity. The explosive reamer comprises a drilling housing slidably arranged in the radial cylinder and a second initiation device 6.52 arranged in the drilling housing. One end of the earth drilling shell, which is far away from the closed inner cavity, is provided with a conical drill bit 6.51, and the side wall of the earth drilling shell is provided with a plurality of side wall notches 6.53. In this embodiment, the inner wall of the one end of the radial barrel of being close to central vertical barrel still is equipped with interior stopper 6.6, and interior stopper is used for the spacing earth casing that bores to. The drilling soil shell and the closed inner cavity are positioned at two opposite sides of the corresponding inner limiting block. In this embodiment, the first initiating device and the second initiating device are both remote control bombs.
The specific steps of reaming the hole bottom of the long pile drilled hole by adopting the hole bottom expanding device comprise:
a, a hole bottom expanding device is placed at the hole bottom of a long pile hole by a connecting rope; b, controlling the first detonation device to detonate to enable the blasting type reamers in the radial cylinders to be ejected into a sidewall soil layer at the hole bottom of the long pile hole; c, controlling the second detonating device to detonate, so as to ream the hole bottom of the long pile hole;
then, hoisting the reinforcement cage into the pile hole of the long pile, and then pouring concrete to form a reinforced concrete cast-in-situ bored pile;
because the hole bottom of the long pile hole is reamed through the hole bottom expanding device before the concrete is poured, after the poured concrete forms the reinforced concrete bored pile, the bottom of the long pile forms a reliable supporting structure as shown in fig. 7, so that the bearing capacity of the long pile serving as a stand column pile is greatly improved, the weight of an upper wall structure is supported before the construction of the shaft type underground stereo garage is completed, and the structure stability and reliability of a foundation pit enclosure system are ensured.
Constructing a crown beam, wherein the crown beam is a reinforced concrete beam and is positioned at the top of the enclosure wall, and the crown beam connects the tops of the cast-in-situ bored piles into a whole;
and (III) constructing an outer wall of the garage, wherein the outer wall of the garage is constructed in the process of downward excavation of the basement of the shaft type underground stereo garage, so that the outer wall of the garage is tightly attached to the enclosure wall.
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 (9)
1. A pit supporting system of a shaft type underground stereo garage is characterized by comprising:
the enclosure wall is annular and consists of a plurality of cast-in-situ bored piles which are sequentially arranged and distributed, any two adjacent cast-in-situ bored piles are mutually occluded, each cast-in-situ bored pile comprises a plain concrete cast-in-situ bored pile and a reinforced concrete cast-in-situ bored pile, and the plain concrete cast-in-situ bored piles and the reinforced concrete cast-in-situ bored piles are sequentially and alternately arranged and distributed;
the garage outer wall is located the enclosure wall inboard, and the garage outer wall is under construction at the downward in-process of excavating of pit shaft formula underground stereo garage's basement to make the garage outer wall hug closely the enclosure wall.
2. The foundation pit enclosure system of the shaft-type underground stereo garage of claim 1, wherein the reinforced concrete bored pile comprises a long pile and a short pile, wherein the short pile has the same length as the plain concrete bored pile, and the long pile has a length greater than the short pile.
3. The foundation pit enclosure system of the shaft-type underground stereo garage of claim 2, wherein the long piles are sequentially distributed at equal intervals, and at least one short pile is distributed between any two adjacent long piles.
4. The foundation pit enclosure system of the shaft-type underground stereo garage of claim 1, 2 or 3, which is characterized by further comprising a crown beam, wherein the crown beam is a reinforced concrete beam, the crown beam is positioned at the top of the enclosure wall, and the crown beam connects the tops of the cast-in-situ bored piles into a whole.
5. The foundation pit enclosure system of the shaft-type underground stereo garage of claim 4, wherein the crown beam is further connected to the top of the outer wall of the garage.
6. The foundation pit enclosure system of the shaft-type underground stereo garage of claim 1, 2 or 3, wherein the reinforced concrete bored pile 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 reinforced concrete bored pile for connecting with an outer wall of the garage, and the outer wall of the garage is connected with the reinforced concrete bored pile through the transverse embedded steel bars.
7. The foundation pit enclosure system of the shaft-type underground stereo garage of claim 1, 2 or 3, wherein the garage outer wall comprises a plurality of outer wall sections distributed from top to bottom in sequence, and any two adjacent outer wall sections are connected through vertical reserved steel bars.
8. The construction method of the foundation pit enclosure system of the shaft type underground stereo garage, which is characterized by comprising the following steps in sequence:
the construction of the enclosure wall comprises the following steps,
firstly, constructing a plain concrete cast-in-situ bored pile;
secondly, constructing a reinforced concrete cast-in-situ bored pile;
constructing a crown beam, wherein the crown beam is a reinforced concrete beam and is positioned at the top of the enclosure wall, and the crown beam connects the tops of the cast-in-situ bored piles into a whole;
and (III) constructing an outer wall of the garage, wherein the outer wall of the garage is constructed in the process of downward excavation of the basement of the shaft type underground stereo garage, so that the outer wall of the garage is tightly attached to the enclosure wall.
9. The construction method of the foundation pit enclosure system of the shaft type underground stereo garage, which is characterized by comprising the following steps in sequence:
the construction of the enclosure wall comprises the following steps,
firstly, constructing a plain concrete cast-in-situ bored pile;
secondly, construction reinforced concrete drilling bored concrete pile include construction long pile and stub, wherein the construction long pile includes following step:
firstly, drilling a hole between two adjacent plain concrete cast-in-situ bored piles to form a long pile hole;
then, a hole bottom expanding device is adopted to expand the hole bottom of the long pile hole, the hole bottom expanding device comprises a central vertical cylinder, a closed inner cavity arranged in the central vertical cylinder, a first explosion initiating device arranged in the closed inner cavity, a plurality of radial cylinders arranged on the outer wall of the central vertical cylinder and an explosion type reamer arranged in the radial cylinders in a sliding mode, the radial cylinders extend in the radial direction of the central vertical cylinder, the inner holes of the radial cylinders are communicated with the closed inner cavity, the explosion type reamer comprises a drilling soil shell arranged in the radial cylinders in a sliding mode and a second explosion initiating device arranged in the drilling soil shell, a conical drill bit is arranged at one end, far away from the closed inner cavity, of the drilling soil shell, and a plurality of side wall notches are formed in the side wall of the drilling soil shell;
the specific steps of reaming the hole bottom of the long pile drilled hole by adopting the hole bottom expanding device comprise:
a, a hole bottom expanding device is placed at the hole bottom of a long pile hole by a connecting rope; b, detonating the first detonation device to enable the blasting reamers in the radial cylinders to be ejected into a sidewall soil layer at the hole bottom of the long pile hole; c, detonating by a second detonating device so as to ream the hole bottom of the long pile hole;
then, hoisting the reinforcement cage into the pile hole of the long pile, and then pouring concrete to form a reinforced concrete cast-in-situ bored pile;
constructing a crown beam, wherein the crown beam is a reinforced concrete beam and is positioned at the top of the enclosure wall, and the crown beam connects the tops of the cast-in-situ bored piles into a whole;
and (III) constructing an outer wall of the garage, wherein the outer wall of the garage is constructed in the process of downward excavation of the basement of the shaft type underground stereo garage, so that the outer wall of the garage is tightly attached to the enclosure wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010147182.0A CN111441361B (en) | 2020-03-05 | 2020-03-05 | Pit enclosure system of shaft type underground stereo garage and construction method |
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Citations (5)
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|---|---|---|---|---|
| CN102720381A (en) * | 2012-06-27 | 2012-10-10 | 郑治中 | Elevator-type underground stereo garage shaft and construction method thereof |
| CN103452121A (en) * | 2013-08-26 | 2013-12-18 | 中冶集团武汉勘察研究院有限公司 | Long pile and short pile combined single-row pile and horizontal internal support pile supporting structure and construction method thereof |
| CN204370431U (en) * | 2014-12-23 | 2015-06-03 | 华东交通大学 | A kind of occlusion long-short pile space enclosing structure |
| KR102023135B1 (en) * | 2019-05-08 | 2019-09-20 | (주)씨엘지오텍 | Cast-In place concrete Pile method using Octangle-casing |
| CN212175750U (en) * | 2020-03-05 | 2020-12-18 | 浙江省建筑设计研究院 | Pit enclosure system of shaft type underground stereo garage |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720381A (en) * | 2012-06-27 | 2012-10-10 | 郑治中 | Elevator-type underground stereo garage shaft and construction method thereof |
| CN103452121A (en) * | 2013-08-26 | 2013-12-18 | 中冶集团武汉勘察研究院有限公司 | Long pile and short pile combined single-row pile and horizontal internal support pile supporting structure and construction method thereof |
| CN204370431U (en) * | 2014-12-23 | 2015-06-03 | 华东交通大学 | A kind of occlusion long-short pile space enclosing structure |
| KR102023135B1 (en) * | 2019-05-08 | 2019-09-20 | (주)씨엘지오텍 | Cast-In place concrete Pile method using Octangle-casing |
| CN212175750U (en) * | 2020-03-05 | 2020-12-18 | 浙江省建筑设计研究院 | Pit enclosure system of shaft type underground stereo garage |
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