CN115030190A - Construction method of foundation pit supporting structure - Google Patents
Construction method of foundation pit supporting structure Download PDFInfo
- Publication number
- CN115030190A CN115030190A CN202210891377.5A CN202210891377A CN115030190A CN 115030190 A CN115030190 A CN 115030190A CN 202210891377 A CN202210891377 A CN 202210891377A CN 115030190 A CN115030190 A CN 115030190A
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- Prior art keywords
- foundation pit
- groove
- supporting structure
- reinforcement cage
- construction method
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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
-
- 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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
-
- 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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a construction method of a foundation pit supporting structure, which comprises the following steps: digging a plurality of groove sections at the periphery of the foundation pit, sequentially connecting the plurality of groove sections end to form a groove, and enclosing the groove at the periphery of the foundation pit; a supporting body is arranged in each groove section; a rotary spraying pile is arranged on the outer side of a joint between two adjacent groove sections; arranging a crown beam at the top ends of the plurality of supporting bodies so that the plurality of supporting bodies form an integral supporting structure; the supporting structure is formed by arranging the plurality of supporting bodies, so that the safety of subsequent construction is improved; meanwhile, the construction cost is saved.
Description
Technical Field
The invention relates to the technical field of engineering construction, in particular to a construction method of a foundation pit supporting structure.
Background
At present, a lot of underground structure constructions all adopt foundation pit supporting structures for guaranteeing construction safety and convenience, and deep foundation pit supporting often adopts structural forms such as underground continuous walls, row piles and the like.
However, the row pile supporting form has too high requirements on the waterproof curtain, the waterproof curtain is often poor in effect due to construction problems, and construction safety is low due to the fact that water-carrying operation exists in the construction process; and the underground continuous wall has a small application range due to overhigh construction cost.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a construction method of a foundation pit supporting structure, which has the advantages of improving the construction safety and saving the construction cost.
The above object of the present invention is achieved by the following technical solutions: a construction method of a foundation pit supporting structure comprises the following steps:
digging a plurality of groove sections at the periphery of a foundation pit, sequentially connecting the groove sections end to form a groove, and enclosing the groove at the periphery of the foundation pit;
a supporting body is arranged in each groove section;
a rotary spraying pile is arranged on the outer side of a joint between two adjacent groove sections;
and arranging a crown beam at the top ends of the supporting bodies so that the supporting bodies form an integral supporting structure.
Preferably, in the construction method of the foundation pit supporting structure provided by the invention, the supporting body comprises a wall body and at least two supporting piles, the two supporting piles are arranged at the bottom end of the wall body, the two supporting piles extend along a first direction of the wall body, and the two supporting piles are arranged at intervals along a second direction of the wall body.
Preferably, the construction method of the foundation pit supporting structure provided by the present invention is that a plurality of groove sections are dug in the periphery of the foundation pit, the plurality of groove sections are sequentially connected at their first ends to form a groove, and the groove is surrounded on the periphery of the foundation pit, and includes:
when the trenching machine digs to a preset distance below the depth of the foundation pit, after the trenching machine stops construction on a first trench section, the trenching machine constructs a second trench section adjacent to the first trench section;
the rotary drilling rig drills at least two holes in the first groove section.
Preferably, the construction method of the foundation pit supporting structure provided by the present invention includes digging a plurality of groove segments at the periphery of the foundation pit, sequentially connecting the head of the plurality of groove segments to form a groove, enclosing the groove behind the periphery of the foundation pit, and before a supporting body is arranged in each groove segment, further including: and guide walls are arranged on two opposite sides of the groove.
Preferably, in the construction method of the foundation pit supporting structure provided by the present invention, a supporting body is provided in each groove section, and the method includes:
manufacturing a reinforcement cage of the support body;
hoisting the reinforcement cage into the groove section through two hoisting devices;
and pouring the reinforcement cage by adopting an underwater concrete pouring process.
Preferably, the construction method of a foundation pit supporting structure provided by the present invention further includes, after the manufacturing of the reinforcement cage of the supporting body, before the hoisting of the reinforcement cage into the groove section by two hoisting devices: and clearing the groove section.
Preferably, the construction method of the foundation pit supporting structure provided by the invention, wherein the pouring of the reinforcement cage by using the underwater concrete pouring process, comprises the following steps:
pouring concrete at the position of the support pile through a guide pipe reserved on the reinforcement cage;
and after the position of the support pile is poured, pouring concrete on the wall body through the guide pipe.
Preferably, the construction method of the foundation pit supporting structure provided by the invention, wherein the two hoisting devices are used for hoisting the reinforcement cage into the groove section, comprises the following steps: and the two support pile positions of the reinforcement cage are respectively inserted into the two holes through the two hoisting devices.
Preferably, in the construction method of the foundation pit supporting structure provided by the invention, the preset distance ranges from 0.3m to 0.7 m.
Preferably, the construction method of the foundation pit supporting structure provided by the present invention further includes, after the guide walls are disposed on the opposite sides of the trench, before the supporting body is disposed in each of the trench sections: and (4) preparing slurry.
In conclusion, the beneficial technical effects of the invention are as follows: the construction method of the foundation pit supporting structure comprises the following steps: digging a plurality of groove sections at the periphery of the foundation pit, wherein the groove sections are sequentially connected end to form a groove, and the groove is arranged around the periphery of the foundation pit; a supporting body is arranged in each groove section; a rotary spraying pile is arranged at the interface between two adjacent groove sections; arranging crown beams at the top ends of the plurality of supporting bodies so that the plurality of supporting bodies form a supporting structure; the supporting structure is formed by arranging the plurality of supporting bodies, so that the safety of subsequent construction is improved; meanwhile, the construction cost is saved.
Drawings
Fig. 1 is a flowchart of a construction method of a foundation pit supporting structure according to an embodiment of the present invention.
Fig. 2 is a top view of a supporting body in the method for constructing a foundation pit supporting structure according to the embodiment of the present invention.
Fig. 3 is a sectional view of a supporting body in a construction method of a foundation pit supporting structure according to an embodiment of the present invention.
In the figure, 1, a support body; 10. a wall body; 20. and (7) supporting the pile.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the construction method of the foundation pit supporting structure disclosed by the invention comprises the following steps:
s101, digging a plurality of groove sections at the periphery of the foundation pit, sequentially connecting the groove sections end to form a groove, and enclosing the groove at the periphery of the foundation pit.
Specifically, a plurality of groove sections are dug in proper order along the circumference of foundation ditch and are established. S102, arranging a supporting body 1 in each groove section; by arranging the supporting body 1, the safety of subsequent construction is improved.
With continued reference to fig. 2 and 3, in the present embodiment, the supporting body 1 includes a wall 10 and at least two supporting piles 20, two supporting piles 20 are disposed at the bottom end of the wall 10, two supporting piles 20 each extend along a first direction of the wall 10, and two supporting piles 20 are disposed at intervals along a second direction of the wall 10; by arranging the supporting piles 20, on one hand, the safety of the supporting body 1 is improved; and on the other hand, the construction cost is saved.
It should be noted that the first direction of the wall 10 is the height direction of the wall 10, the second direction of the wall 10 is the length direction of the wall 10, and the first direction of the wall 10 is perpendicular to the second direction of the wall 10.
The cross-sectional shape of the wall 10 may be rectangular, rhombic, or other various shapes, taking the plane perpendicular to the horizontal plane as the cross-section, and the cross-sectional shape of the wall 10 is not limited herein.
Further, in this embodiment, S101, dig in the periphery of foundation ditch and establish a plurality of groove segments, a plurality of groove segment head connects gradually and constitutes the slot, and the periphery at the foundation ditch is enclosed to the slot, includes:
and S1011, when the trenching machine digs to a preset distance below the depth of the foundation pit, after the trenching machine stops constructing the first groove section, the trenching machine constructs the second groove section adjacent to the first groove section.
Wherein, the equipment used for excavating the groove section is subjected to model selection: when the geology is soft strata such as sandy soil and the like, an SG-60 trenching machine (or equipment of the same grade, the relative cost of the equipment is the lowest, and the construction conditions are met) and a rotary drilling rig for drilling construction can be selected; when the weathered rock stratum is too shallow in geological conditions, the trenching machine can also select SG-60, and the construction can be stopped as long as the trenching meets the requirement of construction to the weathered stratum, and equipment capable of performing weathered construction in a rotary drilling mode needs to be selected.
Before the groove sections are excavated, the groove section excavation sequence is determined according to the construction site conditions and the construction convenience degree.
Specifically, when the groove section is excavated, the grooving machine is used for conducting first groove section construction, when the grooving machine excavates to the preset distance below the bottom of the foundation pit, the grooving machine stops construction, then the grooving machine conducts second groove section construction, the first groove section is replaced by a rotary drilling rig for conducting construction, the process is repeated until all the groove sections are excavated.
Wherein the preset distance is in a range of 0.3m to 0.7 m. In the present embodiment, the preset distance is 0.5 m.
And S1012, drilling at least two holes in the first groove section by the rotary drilling rig.
Specifically, when the rotary drilling rig drills in the groove section, the position of the hole is determined in the groove section, after the position of the hole is determined, the rotary drilling rig starts construction, the quality of mud needs to be guaranteed in the construction process of the rotary drilling rig, after the rotary drilling rig excavates to a designed elevation, construction of another hole is carried out, and when the construction of another hole is in place, namely the groove section is completed, first groove cleaning is carried out.
When it needs to be described, the holes are arranged in one-to-one correspondence with the support piles 20, and in the construction process, one end of the support pile 20, which is far away from the wall 10, is inserted into the hole.
With reference to fig. 1, in this embodiment, S102, a supporting body 1 is disposed in each groove section, and includes:
s1021, manufacturing the reinforcement cage of the support body 1.
Specifically, when the reinforcement cage of the support body 1 is manufactured, the outer opening of the next reinforcement cage is ensured to lean against the inner opening of the joint of the previous reinforcement cage, and the overlarge gap between the two support bodies 1 is avoided.
When the need arises, the reinforcement cage is made by electric welding, and the reinforcement cage must not be bound by galvanized iron wires.
Various raw steel bar materials and welding joints used for manufacturing the steel reinforcement cage need to be subjected to related tests according to regulations, and the steel reinforcement cage can be manufactured after a test piece is qualified.
The required reinforcing bar of unloading processing preparation steel reinforcement cage is carried out according to the construction laying-out drawing strictly, guarantees that the reinforcing bar is violently flat vertical, and the interval accords with the standard requirement, and the steel bar joint welding is firm, and the shaping size is correct. The main reinforcements for manufacturing the reinforcement cage are mechanically connected, and the number of joints on the same section is not more than 50% of the total number of the reinforcements; the main reinforcement is connected with the horizontal reinforcement for manufacturing the reinforcement cage by 50% spot welding; but 100% welding is needed at the following parts:
a. fully welding intersection points of two longitudinal main reinforcements and two horizontal reinforcements on the periphery of the reinforcement cage;
b. the main muscle of longitudinal truss of steel reinforcement cage is connected nodical with the distribution muscle, and the crossing point is connected with the distribution muscle to the horizontal main muscle of truss, and the nodical all needs full weld with the main muscle is connected to hoisting point distribution muscle.
Among them, the fabrication of the steel reinforcement cage should especially ensure the position of the support pile 20 in the supporting body 1 and the catheter retention for concrete casting.
And S1022, hoisting the reinforcement cage into the groove section through two hoisting devices.
It should be noted that, in order to ensure the pouring quality of the integral supporting structure, the steel reinforcement cage is required to be hoisted within 4 hours after the groove is grooved.
Specifically, according to design requirements, the reinforcement cage adopts a construction method of integral hoisting, integral straightening and one-time groove entering, and reliable and effective hoisting construction is adopted, namely, theoretical calculation meets requirements and a hoisting scheme meets safety construction requirements. The basic hoisting equipment is two, and one hoisting equipment is used for main hoisting and the other hoisting equipment is used for auxiliary hoisting.
The hoisting equipment, the hoisting point, the clamping ring and the steel wire rope are selected to meet the relevant requirements of design and specification, and the safety is ensured.
Further, in this embodiment, S1022, hoist the steel reinforcement cage to the groove section through two hoisting equipment in, include: inserting the positions of the two support piles 20 of the reinforcement cage into the two holes through two hoisting devices respectively; this improves the firmness of the support body 1.
And S1023, pouring the reinforcement cage by adopting an underwater concrete pouring process.
Further, in this embodiment, after the steel reinforcement cage of preparation supporter 1, before hoisting the steel reinforcement cage to the groove section in through two lifting device, still include: and cleaning the tank section to ensure that the sediments at the bottom of the tank section meet the design specification.
With continued reference to fig. 1, in this embodiment, S1023, the pouring of the reinforcement cage by using the underwater concrete pouring process includes:
and S10231, pouring concrete at the position of the support pile 20 through a guide pipe reserved on the reinforcement cage.
And S10232, after the position of the pile 20 to be supported is poured, pouring concrete at the position of the wall 10 through a guide pipe.
The entire cast portion of the support body 1 is required to be continuous, and a fault or the like cannot occur. The whole pouring has strict requirements on the pouring quality and the operation specification of the underwater concrete, and the requirements on the concrete quality, the mixing ratio and the like are high; and (5) sequentially constructing until the whole supporting structure is completely finished.
Further, in this embodiment, dig in the periphery of foundation ditch and establish a plurality of groove sections, a plurality of groove section head connect gradually and constitute the slot, the slot encloses to be established after the periphery of foundation ditch, all sets up before the support body 1 in every groove section, still includes: guide walls are arranged on two opposite sides of the groove.
Specifically, the shaft line lofting work of the guide wall is carried out and checked, and the excavation adopts the combination of machinery and manpower, so that the disturbance of original soil is strictly prohibited; attention should be paid to 3cm chamfering when the cushion layer is laid; the inner mold vertical template and the outer mold of the guide wall are both replaced by soil; and uniformly casting and tamping two sides of the cast and tamped concrete of the guide wall and tamping the concrete tightly by a vibrator. The guide wall ensures the accuracy and vertical precision of the groove section position. Because the large-scale equipment on the road surface is more, the road surface and the guide wall need bear larger weight, the deformation exceeding the specification of the clear width and the position after the construction of the guide wall needs to be prevented under the condition, and the adverse effect on the quality of the supporting structure is avoided.
Specifically, a plane perpendicular to a horizontal plane is taken as a cross section, and the cross section of the guide wall is L-shaped.
Further, in this embodiment, after the opposite sides in slot all set up the guide wall, before all setting up supporter 1 in every groove section, still include: and (4) preparing slurry.
Wherein, the supporting structure adopts the following materials to prepare wall protection slurry:
A) and (3) bentonite: commercial bentonite of 200 meshes.
B) Water: tap water.
C) Dispersing agent: soda ash (Na2CO 3).
D) And (3) a tackifier: CMC (high viscosity, powder).
Specifically, after the slurry preparation is completed, the slurry is stored by using a slurry tank.
The mud circulation adopts 3LM type mud pump to deliver, and 4PL type mud pump retrieves, constitutes the mud circulation pipeline by mud pump and hose.
S103, arranging a jet grouting pile outside a joint between two adjacent groove sections.
Specifically, after all the supporting bodies 1 are poured, rotary jet grouting pile construction is carried out at joints among all the groove sections, and the rotary jet grouting pile construction is carried out to the bottom elevation of the upper portion of each supporting body 1 so as to ensure the waterproofness of the joints of the whole groove sections.
And S104, arranging a crown beam at the top ends of the plurality of supporting bodies 1 so that the plurality of supporting bodies 1 form an integral supporting structure.
Specifically, the construction of the top beam is carried out after the construction of the jet grouting pile is completed, the whole supporting structure is integrated through the construction of the top beam, and the safety of the supporting structure is further improved.
The construction method of the foundation pit supporting structure comprises the following steps: digging a plurality of groove sections at the periphery of the foundation pit, wherein the groove sections are sequentially connected end to form a groove, and the groove is arranged around the periphery of the foundation pit; a supporting body 1 is arranged in each groove section; a rotary spraying pile is arranged on the outer side of a joint between two adjacent groove sections; arranging a crown beam at the top ends of the plurality of supporting bodies 1 so that the plurality of supporting bodies 1 form an integral supporting structure; the supporting structure is formed by arranging the plurality of supporting bodies 1, so that the safety of subsequent construction is improved; meanwhile, the construction cost is saved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A construction method of a foundation pit supporting structure is characterized by comprising the following steps: the method comprises the following steps:
digging a plurality of groove sections at the periphery of a foundation pit, wherein the groove sections are sequentially connected end to form a groove, and the groove is arranged around the periphery of the foundation pit;
a supporting body is arranged in each groove section;
a rotary spraying pile is arranged on the outer side of a joint between two adjacent groove sections;
and arranging a crown beam at the top ends of the supporting bodies so that the supporting bodies form an integral supporting structure.
2. The construction method of a foundation pit supporting structure according to claim 1, characterized in that: the supporting body comprises a wall body and at least two supporting piles, the two supporting piles are arranged at the bottom end of the wall body, the two supporting piles extend along a first direction of the wall body, and the two supporting piles are arranged at intervals along a second direction of the wall body.
3. The construction method of a foundation pit supporting structure according to claim 2, characterized in that: dig in the periphery of foundation ditch and establish a plurality of groove sections, it is a plurality of the groove section head connects gradually and constitutes the slot, the slot encloses to be established the periphery of foundation ditch includes:
when the trenching machine digs to a preset distance below the depth of the foundation pit, after the trenching machine stops construction on a first trench section, the trenching machine constructs a second trench section adjacent to the first trench section;
the rotary drilling rig drills at least two holes in the first groove section.
4. The construction method of a foundation pit supporting structure according to claim 1, characterized in that: dig in the periphery of foundation ditch and establish a plurality of groove sections, it is a plurality of groove section head connects gradually constitutes the slot, the slot encloses to be established after the periphery of foundation ditch, every before all setting up the support body in the groove section, still include:
and guide walls are arranged on two opposite sides of the groove.
5. A method of constructing a foundation pit supporting structure according to claim 3, wherein: every all set up the supporter in the groove section, include:
manufacturing a reinforcement cage of the support body;
hoisting the reinforcement cage into the groove section through two hoisting devices;
and pouring the reinforcement cage by adopting an underwater concrete pouring process.
6. The construction method of a foundation pit supporting structure according to claim 5, wherein: after the preparation the steel reinforcement cage of the support body, before will through two lifting device the steel reinforcement cage hoist to in the groove section, still include:
and clearing the groove section.
7. The construction method of a foundation pit supporting structure according to claim 5, wherein: the method for pouring the reinforcement cage by adopting the underwater concrete pouring process comprises the following steps:
pouring concrete at the position of the support pile through a guide pipe reserved on the reinforcement cage;
and after the position of the support pile is poured, pouring concrete on the position of the wall body through the guide pipe.
8. The construction method of a foundation pit supporting structure according to claim 5, wherein: the will through two lifting device the steel reinforcement cage hoist and mount extremely in the groove section, include:
and the two support pile positions of the reinforcement cage are respectively inserted into the two holes through the two hoisting devices.
9. A method of constructing a foundation pit supporting structure according to claim 3, wherein: the preset distance ranges from 0.3m to 0.7 m.
10. The construction method of a foundation pit supporting structure according to claim 4, wherein: after all setting up the guide wall in the relative both sides of slot, before all setting up the supporter in every the groove section, still include: and (4) preparing slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210891377.5A CN115030190A (en) | 2022-07-27 | 2022-07-27 | Construction method of foundation pit supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210891377.5A CN115030190A (en) | 2022-07-27 | 2022-07-27 | Construction method of foundation pit supporting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115030190A true CN115030190A (en) | 2022-09-09 |
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ID=83130717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210891377.5A Withdrawn CN115030190A (en) | 2022-07-27 | 2022-07-27 | Construction method of foundation pit supporting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115030190A (en) |
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2022
- 2022-07-27 CN CN202210891377.5A patent/CN115030190A/en not_active Withdrawn
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Application publication date: 20220909 |
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