CN219710338U - Deep foundation pit supporting structure - Google Patents

Abstract

The utility model discloses a deep foundation pit supporting structure, which comprises a plurality of SMW construction method piles, wherein the SMW construction method piles are sequentially arranged along the edge of a foundation pit; the inclined piles are positioned on the inner sides of the SMW construction method piles, and the arrangement direction of the inclined piles is the same as that of the SMW construction method piles; the crown beam is arranged at the tops of the SMW construction method piles and the inclined piles and is used for connecting the SMW construction method piles and the inclined piles. The deep foundation pit supporting structure provided by the utility model has the advantages of clear principle, low cost, high feasibility, reliable quality, effective shortening of the construction period, better control of the soil displacement at the rear side of the foundation pit, resource saving and environmental protection. The structure has huge application potential and can be widely applied to foundation pit support. Is worth popularizing and using in a large area.

Description

Deep foundation pit supporting structure

Technical Field

The utility model relates to the technical field of civil engineering, in particular to a deep foundation pit supporting structure.

Background

The foundation pit engineering mainly comprises foundation pit supporting system design and construction and earth excavation, and is a system engineering with strong comprehensiveness. It requires close coordination of geotechnical engineering and structural engineering technicians. The foundation pit supporting system is a temporary structure and is not needed after the underground engineering construction is completed.

In deep foundation pit excavation, the inner support structure is widely applied due to the advantages of no occupation of underground space resources outside the foundation pit, capability of improving the overall strength and rigidity of the whole enclosure system, capability of effectively controlling foundation pit deformation and the like. The inner support structure has its inevitable drawbacks. For example, the formation and dismantling of the internal support structure requires a certain time, which results in a great amount of waste of building materials, and its existence is also unfavorable for large-scale mechanical excavation and a long construction period.

Therefore, providing a supporting structure suitable for deep foundation pit supporting, which has short construction period and reliable quality is an urgent technical problem to be solved by those skilled in the art.

Disclosure of Invention

The utility model provides a deep foundation pit supporting structure.

The utility model provides the following scheme:

a deep foundation pit supporting structure, comprising:

the SMW construction method piles are sequentially arranged along the edge of the foundation pit;

the inclined piles are positioned on the inner sides of the SMW construction method piles, and the arrangement direction of the inclined piles is the same as that of the SMW construction method piles;

the crown beam is arranged at the tops of the SMW construction method piles and the inclined piles and is used for connecting the SMW construction method piles and the inclined piles.

Preferably: the SMW construction pile comprises H-shaped steel.

Preferably: the inclined pile comprises any one of PHC pipe piles, prefabricated square piles and steel pipe piles.

According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects:

according to the utility model, a deep foundation pit supporting structure can be realized, and in one implementation mode, the structure can comprise a plurality of SMW construction method piles, and the SMW construction method piles are sequentially arranged along the edge of the foundation pit; the inclined piles are positioned on the inner sides of the SMW construction method piles, and the arrangement direction of the inclined piles is the same as that of the SMW construction method piles; the crown beam is arranged at the tops of the SMW construction method piles and the inclined piles and is used for connecting the SMW construction method piles and the inclined piles. The deep foundation pit supporting structure provided by the utility model has the advantages of clear principle, low cost, high feasibility, reliable quality, effective shortening of the construction period, better control of the soil displacement at the rear side of the foundation pit, resource saving and environmental protection. The structure has huge application potential and can be widely applied to foundation pit support. Is worth popularizing and using in a large area.

Of course, it is not necessary for any one product to practice the utility model to achieve all of the advantages set forth above at the same time.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic plan view of a deep foundation pit supporting structure according to an embodiment of the present utility model;

fig. 2 is a schematic partial cross-sectional view of a deep foundation pit supporting structure according to an embodiment of the present utility model.

In the figure: SMW construction method stake 1, H shaped steel 11, inclined pile 2, roof beam 3.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the utility model, fall within the scope of protection of the utility model.

Examples

Referring to fig. 1 and fig. 2, in order to provide a deep foundation pit supporting structure according to an embodiment of the present utility model, as shown in fig. 1 and fig. 2, the structure may include:

the SMW construction method piles 1 are sequentially arranged along the edge of the foundation pit;

the inclined piles 2 are positioned on the inner sides of the SMW construction method piles 1, and the arrangement direction of the inclined piles 2 is the same as that of the SMW construction method piles 1;

the crown beam 3 is arranged at the tops of the SMW construction piles 1 and the inclined piles 2, and the crown beam 3 is used for connecting the SMW construction piles 1 and the inclined piles 2.

According to the deep foundation pit supporting structure provided by the embodiment of the utility model, the SMW construction method piles are adopted to form the retaining wall structure at the inner side edge of the foundation pit, and the inclined piles are adopted to serve as the inclined supports, so that a good supporting effect can be obtained after the crown beam construction is finished. Meanwhile, the section steel in the SMW construction method pile can be recycled after the foundation pit is excavated, other parts do not need to be disassembled, and the section steel is buried in the foundation pit after backfilling of the foundation pit.

Further, the embodiment of the utility model can provide that the SMW construction method pile 1 comprises H-shaped steel 11. The inclined pile 2 comprises any one of PHC pipe piles, prefabricated square piles and steel pipe piles. The SMW construction method pile is located outside the foundation pit supporting structure, the inclined pile is located inside the foundation pit supporting structure, and the crown beam connects the SMW construction method pile with the inclined pile.

In concrete implementation, the construction method of the foundation pit supporting structure comprises the following steps:

step one, according to site conditions and calculation analysis, determining design and construction parameters of the SMW construction method piles, the inclined piles and the crown beams.

Step two, SMW construction method pile construction, including:

1. and (3) measuring and paying off: according to the axis datum point, discharging the guard post side line and the control line, setting a temporary control mark, and performing technical rechecking;

2. excavating a guide ditch: digging a groove and removing underground barriers, wherein the width of the groove is determined according to the width of the enclosure structure;

3. setting guide in-place section steel: two positioning section steel are placed in the direction of the parallel groove, the positioning section steel is required to be fixed firmly and can be fixed by spot welding, and the H-shaped steel is positioned by adopting a section steel positioning clamp;

4. SMW stake machine location: the pile frame of the drilling machine is stable and straight, the in-place deviation value is not more than 20mm, a leveling ruler is used for leveling the platform before drilling, and the frame is straightened, so that the verticality of the frame is ensured to be less than 1/250;

5. stirring and piling: mixing cement slurry according to design requirements before starting up, determining drilling and stirring construction sequence according to construction site conditions, and performing the drilling and stirring construction sequence by adopting a continuous mode of full-sleeve repeated drilling and stirring of a jump-slot type double-hole, wherein the sinking and lifting speed of a stirring drilling machine is strictly controlled, the guniting sinking speed is controlled to be 0.5-1 m/min, the lifting speed is controlled to be 1-2 m/min, and the cement slurry and the foundation soil are fully mixed at a constant speed;

6. selecting and welding profile steel: checking and accepting the section steel piece by piece before using;

7. and (3) brushing a friction reducer: dirt and rust on the surface of the section steel should be removed, and the friction reducer should be uniformly smeared on the section steel inserted into the cement soil under the drying condition. When the ring beam is pressed by the casting enclosure wall, the section steel part buried in the ring beam is separated from the concrete by using hard isolating materials such as foam plastic sheets and the like so as to be beneficial to the pulling and recovery of the section steel;

8. inserting and fixing the section steel: after piling, the crane should be in place immediately. During the lifting process, the section steel is kept in a vertical state. The insertion time of the section steel is controlled within 3 hours after the construction of the stirring pile is finished, and the insertion method of repeatedly hoisting the section steel and loosening the hook to fall is strictly forbidden.

Step three, construction of inclined piles, which comprises the following steps:

1. measuring and paying off;

2. positioning equipment;

3. hammering pile sinking or static pressure pile sinking;

4. if the length of a single pile does not meet the design requirement, pile splicing is needed;

5. repeating the steps 3 and 4 until the pile construction is completed.

And fourthly, crown beam construction.

Step five: and excavating a foundation pit and constructing a main body underground structure.

Step six: recovering the section steel: after the construction of the main underground structure is completed, backfilling and compacting are carried out between the outer wall of the structure and the enclosure structure, a special fixture and a jack are adopted, a ring beam is used as a counter beam, the recycled section steel is pulled up, and the section steel gap is automatically filled with cement mortar with the water-cement ratio of 0.4-0.8 until the section steel gap is compacted.

In a word, the deep foundation pit supporting structure provided by the utility model has the advantages of clear principle, low cost, high feasibility, reliable quality, effective shortening of the construction period, better control of the soil displacement at the rear side of the foundation pit, resource saving and environmental protection. The structure has huge application potential and can be widely applied to foundation pit support. Is worth popularizing and using in a large area.

It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.

Claims (3)

1. A deep foundation pit supporting structure, comprising:

the SMW construction method piles are sequentially arranged along the edge of the foundation pit;

the inclined piles are positioned on the inner sides of the SMW construction method piles, and the arrangement direction of the inclined piles is the same as that of the SMW construction method piles;

the crown beam is arranged at the tops of the SMW construction method piles and the inclined piles and is used for connecting the SMW construction method piles and the inclined piles.

2. The deep foundation pit supporting structure of claim 1, wherein the SMW method piles comprise H-section steel.

3. The deep foundation pit supporting structure of claim 1, wherein the inclined piles comprise any one of PHC piles, prefabricated square piles and steel pipe piles.