CN108978680B - Mucky soil elevator foundation pit supporting construction device and method - Google Patents
Mucky soil elevator foundation pit supporting construction device and method Download PDFInfo
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- CN108978680B CN108978680B CN201810960095.XA CN201810960095A CN108978680B CN 108978680 B CN108978680 B CN 108978680B CN 201810960095 A CN201810960095 A CN 201810960095A CN 108978680 B CN108978680 B CN 108978680B
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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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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Abstract
The invention belongs to the technical field of pit-in-pit construction of foundation pits, and discloses a mucky soil elevator foundation pit supporting construction device and method, wherein a diagonal I-shaped steel is welded with an enclosing purlin through a fillet weld; one end of the enclosing purlin support is welded with the steel sheet pile through a fillet weld, and the other end of the enclosing purlin support is welded with the enclosing purlin through a fillet weld; the reinforced concrete retaining wall is connected with the concrete cushion layer in a pouring mode. The steel sheet pile and the purlin are used as temporary supports for construction of the retaining wall, the steel sheet pile is pulled out after the construction is finished, the steel sheet pile can be reused, and the cost is reduced; the reinforced concrete retaining wall is used as a retaining support and an outer side template of the side wall of the elevator foundation pit; the reinforced concrete retaining wall with the thickness of 250mm is used as mucky soil (soft plastic-flow plastic) for the excavation support of the elevator foundation pit, so that the safety of the excavation of the elevator foundation pit can be effectively ensured.
Description
Technical Field
The invention belongs to the technical field of pit-in-pit construction of foundation pits, and particularly relates to a mucky soil elevator foundation pit supporting construction device and method.
Background
Currently, the current state of the art commonly used in the industry is such that: the excavation of the mucky soil elevator foundation pit earthwork is a project with great potential safety hazard, particularly the fluidity of the mucky soil body in a soft plastic-flow plastic state is great, if the supporting mode before the excavation of the foundation pit cannot be properly selected, the side wall of the elevator foundation pit is easy to collapse, and unnecessary personal and property losses are caused; according to the traditional elevator foundation pit supporting scheme, if the soil quality is good, slope placing can be carried out according to the structural slope ratio, slope spraying and anchoring treatment can meet construction requirements, if the pit bottom is in a silty soil layer with flow plastic-soft plastic, the structural slope ratio cannot meet self-stability requirements, reinforcing measures such as increasing the slope ratio and driving wood piles into the slope top are needed, on one hand, deformation of an engineering pile can be caused, on the other hand, disturbance on original state soil is caused, the requirement on backfill soil for foundation construction is high, uneven settlement of later-stage foundations can be caused, and both the deformation of the engineering pile or the uneven settlement of the foundations and later-stage maintenance cost are high.
In conclusion, in order to avoid economic losses caused by later maintenance and shutdown, the elevator foundation pit support needs to adopt a support structure with higher rigidity and better deformation control.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a mucky soil elevator foundation pit supporting construction device and method.
The invention is realized in this way, a mucky soil elevator foundation pit supporting construction device, which is provided with:
steel sheet piles;
the oppositely supported I-shaped steel is welded with the surrounding purlin through fillet welding;
one end of the enclosing purlin support is welded with the steel sheet pile through a fillet weld, and the other end of the enclosing purlin support is welded with the enclosing purlin through a fillet weld;
the reinforced concrete retaining wall is connected with the concrete cushion layer in a pouring mode.
Further, the steel sheet piles and the surrounding purlins are temporary supports; the enclosing purlin support is an inclined strut.
Furthermore, stone powder is backfilled between the steel sheet pile and the reinforced concrete retaining wall.
The invention also aims to provide a mucky soil elevator foundation pit supporting construction method applying the mucky soil elevator foundation pit supporting construction device, and the mucky soil elevator foundation pit supporting construction method comprises the following steps:
firstly, constructing a steel sheet pile, positioning and paying off the position of the steel sheet pile according to the position of an elevator shaft, constructing the steel sheet pile after the wire inspection is qualified, and constructing a pile top with an elevated flat bottom;
excavating earthwork, mounting enclosing purlins and supports, excavating the earthwork in the steel sheet pile foundation trench to the height of the bottom of the enclosing purlins, and mounting a first enclosing purlin, a counter support and a corner support as required;
step three, finally excavating the earthwork, reserving 300mm to the design elevation in the last step of excavating the earthwork according to the design requirement, and manually clearing the earthwork;
and fourthly, constructing a first section of retaining wall, dismantling the surrounding purlin, pouring a concrete cushion layer, positioning and setting off the retaining wall, binding reinforcing steel bars, erecting a template, and pouring first section of retaining wall concrete to the bottom of the surrounding purlin. After the design strength is reached, filling stone powder between the retaining wall and the steel sheet pile layer by layer, and removing the enclosing purlin, the opposite supports and the angle supports after the filling is stable;
constructing a second section of retaining wall, binding retaining wall steel bars, erecting a template, pouring second section retaining wall concrete to be flush with the elevation of the top of the steel sheet pile, and backfilling stone powder between the retaining wall and the steel sheet pile after the design strength is reached;
and step six, pulling out the steel sheet pile, removing the steel sheet pile after the steel sheet pile is backfilled stably, and filling stone powder into the pile hole while pulling out.
Further, the specification of the steel sheet pile in the step one is 40b, the length of the steel sheet pile is 12 meters, and the steel sheet pile is one square and one square during construction.
Furthermore, in the second step, the enclosing purlin, the opposite support and the angle support are all combined by 40b I-steel double joints, and an E45 welding rod is used during welding.
Further, the thickness of the reinforced concrete retaining wall in the fourth step and the fifth step is 250mm, the horizontal bars and the double rows of vertical bars are phi 8@200, and the tie bars are phi 6@600 x 600.
The invention also aims to provide a construction device and a method for supporting the foundation pit of the mucky soil elevator.
In summary, the advantages and positive effects of the invention are: according to the construction method, the steel sheet pile, the surrounding purlin and the horizontal support are used as a temporary support system, the construction of the retaining wall is carried out, the supporting and dismantling are carried out and the steel sheet pile is pulled out after the construction is finished, the steel sheet pile can be repeatedly used, the construction period is short, and the material cost is reduced; after construction, the reinforced concrete retaining wall is used as a retaining support and also used as an outer side template of the side wall of the elevator foundation pit; the reinforced concrete retaining wall with the thickness of 250mm is used as mucky soil (soft plastic-flow plastic) for the excavation support of the elevator foundation pit, so that the safety of the excavation of the elevator foundation pit can be effectively ensured. Compared with the conventional large slope and wood pile slope top reinforcement, foundation backfill and brick film building, the supporting cost of one elevator shaft can be saved by about 3.5 ten thousand yuan, and the construction period is saved by 4 days.
Drawings
FIG. 1 is a schematic structural view of a mucky soil elevator foundation pit supporting construction device provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of a steel sheet pile and a purlin surrounding support provided by the embodiment of the invention;
fig. 3 is a schematic structural diagram of a steel sheet pile, a purlin and a diagonal brace provided by the embodiment of the invention;
in the figure: 1. steel sheet piles; 2. enclosing purlins; 3. oppositely supporting I-shaped steel; 4. a reinforced concrete retaining wall; 5. enclosing a purlin support; 6. a concrete pad.
Fig. 4 is a flow chart of a construction method for a mucky soil elevator foundation pit support provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention aims to solve the problem of higher supporting cost of the traditional foundation pit supporting scheme; the invention can realize the repeated use of the steel sheet pile and reduce the cost; the reinforced concrete retaining wall is used dually; effectively guarantee the security of elevator foundation ditch excavation.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1 to 3, a mucky soil elevator foundation pit supporting construction device provided by an embodiment of the invention comprises: the steel sheet pile comprises a steel sheet pile 1, a surrounding purlin 2, oppositely-supported H steel 3, a reinforced concrete retaining wall 4, a surrounding purlin support 5 and a concrete cushion 6.
One end of the H steel 3 is welded with the steel sheet pile 1 through a fillet weld, the other end of the H steel 3 is connected with the surrounding purlin 2 through a fillet weld, one end of the surrounding purlin support 5 is welded with the steel sheet pile 1 through a fillet weld, the other end of the surrounding purlin support 5 is welded with the surrounding purlin 2 through a fillet weld, and the peripheral reinforced concrete retaining wall 4 is connected with the concrete cushion 6 in a pouring mode.
As shown in fig. 4, the method for supporting and constructing a mucky soil elevator foundation pit provided by the embodiment of the invention comprises the following steps:
s401: constructing a steel sheet pile, positioning and paying off the position of the steel sheet pile according to the position of the elevator shaft, constructing the steel sheet pile after the line is checked to be qualified, and constructing the steel sheet pile with the pile top being high and the bottom being flat;
s402: excavating earthwork, mounting enclosing purlins and supports, excavating the earthwork in the steel sheet pile foundation trench to the elevation of the bottom of the enclosing purlins, and mounting a first enclosing purlin, a counter support and a corner support as required;
s403: finally, earth excavation is carried out, according to design requirements, the earth excavation in the last step is carried out until the design elevation is reserved for 300mm, and earth is cleaned manually;
s404: constructing a first section of retaining wall, dismantling the surrounding purlin, pouring a concrete cushion layer, positioning and paying off the retaining wall, binding reinforcing steel bars, erecting a template, pouring first section of retaining wall concrete and arranging the bottom of the purlin. After the design strength is reached, filling stone powder between the retaining wall and the steel sheet pile layer by layer, and removing the enclosing purlin, the opposite supports and the angle supports after the filling is stable;
s405: constructing a second section of retaining wall, binding retaining wall steel bars, erecting a template, pouring second section retaining wall concrete to be flush with the elevation of the top of the steel sheet pile, and backfilling stone powder between the retaining wall and the steel sheet pile after the design strength is reached;
s406: and pulling out the steel sheet pile, after backfilling is stable, pulling out the steel sheet pile, and filling stone powder into the pile hole while pulling out.
In the preferred embodiment of the present invention, the steel sheet pile has a size of 40b and a length of 12 m in step S401, and the steel sheet pile is one-to-one during construction.
In the preferred embodiment of the invention, in step S402, the enclosing purlin, the butt brace and the corner brace are all combined by 40b i-steel double joint, and an E45 welding rod is used for welding.
In the preferred embodiment of the present invention, the thickness of the reinforced concrete retaining wall should be 250mm in steps S404 and S405, and both the horizontal bars and the double rows of vertical bars are A8@200, and the tie bars are a6@600 x 600.
The application of the principles of the present invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-3, the method for supporting and constructing a mucky soil elevator foundation pit provided by the embodiment of the invention comprises the following steps:
firstly, driving a steel sheet pile 1;
according to the position of the elevator shaft, positioning and paying off the position of the steel sheet pile 1 are carried out, after the wire inspection is qualified, the steel sheet pile is driven into a flat bottom plate with the specification of 40b I-steel and the length of 12 meters, and the pile top of the steel sheet pile 1 is high.
Step two, excavating earthwork in the first step, and installing an enclosing purlin 2 and a support;
the first step of earth excavation in the steel sheet pile 1 foundation groove is to the height of the bottom of the enclosing purlin, the enclosing purlin 2, the opposite supports and the angle supports which are formed by 40b I-steel double-joint combination are installed according to requirements, and E45 welding rods are used during welding.
Step three, last step earth excavation
And according to design requirements, the earth is excavated to the designed elevation in the last step and is reserved for 300mm, and the earth is cleaned manually.
Step four, constructing a first section of reinforced concrete retaining wall 4, and removing the surrounding purlin 2
And pouring a concrete cushion 6, positioning and paying off the reinforced concrete retaining wall 4, binding reinforcing steel bars, erecting a template, and pouring the concrete of the first section of the reinforced concrete retaining wall 4 to the bottom of the surrounding purlin 2. The thickness of the reinforced concrete retaining wall 4 is 250mm, and the horizontal bars and the double rows of vertical bars are A8@200 and the tie bars are A6@600 multiplied by 600. And after the design strength is reached, backfilling mountain flour in layers between the reinforced concrete retaining wall 4 and the steel sheet pile 1, and removing the surrounding purlin, the opposite supports and the angle supports after the backfilling is stable.
Step five, constructing a second section of reinforced concrete retaining wall 4
Binding retaining wall reinforcing steel bars, erecting a template, pouring a second section of reinforced concrete retaining wall 4 to be flush with the top standard height of the steel sheet pile 1, and backfilling stone powder between the reinforced concrete retaining wall 4 and the steel sheet pile 1 after the design strength is reached.
Step six, pulling out the steel sheet pile 1
After the steel sheet pile 1 is backfilled stably, the steel sheet pile 1 is pulled out, and stone powder is poured into the pile hole of the steel sheet pile 1 while pulling.
In the embodiment of the invention, in the process of excavation of the foundation pit, a ramp is reserved so that a pile driver can smoothly go up and down in the process of driving the steel sheet pile of the elevator foundation pit; the steel sheet pile is driven by a crawler excavator (with a vibration hammer), the condition of the underground engineering pile must be familiar before driving, and the accurate central line of the support pile is carefully discharged; before piling, grease is applied to the I-shaped steel web plate so as to facilitate driving and pulling out. And measuring and monitoring the inclination of each pile at any time in the inserting and striking process to be not more than 2%, and pulling and striking when the inclination is too large and cannot be adjusted by a pulling and aligning method. After the strength of the retaining wall meets the requirement and the gap between the retaining wall and the steel sheet pile is filled with stone chips, the enclosing purlin and the support can be removed; and (4) backfilling the pile holes left after pile pulling in time by using stone chips.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A mucky soil elevator foundation pit support construction method is characterized by comprising the following steps:
firstly, constructing a steel sheet pile, positioning and paying off the position of the steel sheet pile according to the position of an elevator shaft, constructing the steel sheet pile after the wire inspection is qualified, and constructing a pile top with an elevated flat bottom;
excavating earthwork, mounting enclosing purlins and supports, excavating the earthwork in the steel sheet pile foundation trench to the height of the bottom of the enclosing purlins, and mounting a first enclosing purlin, a counter support and a corner support as required;
step three, finally excavating the earthwork, reserving 300mm to the design elevation in the last step of excavating the earthwork according to the design requirement, and manually clearing the earthwork;
constructing a first section of retaining wall, dismantling the surrounding purlin, pouring a concrete cushion layer, positioning and setting off the retaining wall, binding reinforcing steel bars, erecting a template, and pouring first section of retaining wall concrete to the bottom of the surrounding purlin; after the design strength is reached, filling stone powder between the retaining wall and the steel sheet pile layer by layer, and removing the enclosing purlin, the opposite supports and the angle supports after the filling is stable;
constructing a second section of retaining wall, binding retaining wall steel bars, erecting a template, pouring second section retaining wall concrete to be flush with the elevation of the top of the steel sheet pile, and backfilling stone powder between the retaining wall and the steel sheet pile after the design strength is reached;
and step six, pulling out the steel sheet pile, removing the steel sheet pile after the steel sheet pile is backfilled stably, and filling stone powder into the pile hole while pulling out.
2. The mucky soil elevator foundation pit support construction method according to claim 1, wherein in the first step, the steel sheet pile has a specification of 40b and a length of 12 m, and during construction, the steel sheet pile is one-square-in-one-square.
3. The mucky soil elevator foundation pit support construction method according to claim 1, wherein in the second step, the enclosing purlin, the opposite supports and the corner supports are all combined by 40b I-steel double joints, and E45 welding rods are used during welding.
4. The mucky soil elevator foundation pit support construction method of claim 1, wherein the thickness of the reinforced concrete retaining wall in the fourth step and the fifth step is 250mm, and the horizontal bars and the double rows of vertical bars are both phi 8@200, and the tie bars are phi 6@600 x 600.
5. The mucky soil elevator foundation pit support construction method according to claim 1, wherein the mucky soil elevator foundation pit support construction device is provided with:
steel sheet piles;
the oppositely supported I-shaped steel is welded with the surrounding purlin through fillet welding;
one end of the enclosing purlin support is welded with the steel sheet pile through a fillet weld, and the other end of the enclosing purlin support is welded with the enclosing purlin through a fillet weld;
the reinforced concrete retaining wall is connected with the concrete cushion layer in a pouring mode;
the steel sheet piles and the surrounding purlins are temporary supports; the enclosing purlin support is an inclined strut.
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| CN201810960095.XA CN108978680B (en) | 2018-08-22 | 2018-08-22 | Mucky soil elevator foundation pit supporting construction device and method |
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| CN201810960095.XA CN108978680B (en) | 2018-08-22 | 2018-08-22 | Mucky soil elevator foundation pit supporting construction device and method |
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| CN108978680B true CN108978680B (en) | 2020-11-27 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109469071B (en) * | 2018-12-27 | 2024-04-09 | 上海绿地建设(集团)有限公司 | Connecting piece for foundation pit supporting structure and foundation pit supporting structure |
| CN110424450A (en) * | 2019-07-31 | 2019-11-08 | 中国十七冶集团有限公司 | A kind of construction method for the retaining wall also serving as brick fetal membrane |
| CN113090066A (en) * | 2021-04-16 | 2021-07-09 | 华润建筑有限公司 | Construction method for newly added entrances and exits of existing buildings and elevator shaft |
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| KR101713674B1 (en) * | 2015-11-05 | 2017-03-23 | 주식회사 한빛구조엔지니어링 | Underground slab structure and underground construction method using the same |
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