CN212001226U

CN212001226U - Backfill miscellaneous soil composite foundation structure

Info

Publication number: CN212001226U
Application number: CN202020546340.5U
Authority: CN
Inventors: 剧捧捧
Original assignee: Ju Pengpeng
Current assignee: Ju Pengpeng
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-11-24
Anticipated expiration: 2030-04-14

Abstract

The utility model discloses a backfill miscellaneous soil composite foundation structure, including ordinary ground baseband and subsidence area, the subsidence area is dug and is equipped with the foundation ditch to the foundation ditch all is provided with the step portion that extends to ordinary ground baseband to both sides, it has grey sand soil layer to backfill between foundation ditch and the step portion top to the main stake hole has been seted up to the foundation ditch bottom, the inside of ordinary ground baseband has been seted up and has been assisted the stake hole, and the main stake hole all is provided with first steel reinforcement cage with the inside of assisting the stake hole, the utility model relates to a foundation structure technical field. The backfill miscellaneous soil composite foundation structure has the advantages that the inverted trapezoidal hierarchical structure is formed by the sand lime soil layer, the graded gravel layer and the concrete layer, the bridge structure is formed by the first steel reinforcement cage and the second steel reinforcement cage, the graded gravel layer, the sand lime soil layer, the second steel reinforcement cage and the concrete layer are jointly used as a pile end bearing layer, the bearing force of the foundation structure in a subsidence area is enhanced, the anti-subsidence capacity of the subsidence area and a common ground base band is synchronized, and the tamping operation amount is reduced.

Description

Backfill miscellaneous soil composite foundation structure

Technical Field

The utility model relates to a foundation structure technical field specifically is a backfill miscellaneous soil composite foundation structure.

Background

The civil foundation refers to a soil body or a rock body for supporting a foundation under a building, the soil layer serving as the building foundation is divided into rock, gravel soil, sand soil, silt, cohesive soil and artificial filling soil, the foundation comprises a natural foundation and an artificial foundation (composite foundation), the natural foundation is a natural soil layer which does not need to be reinforced by people, the artificial foundation needs to be reinforced by people, and a stone chip cushion layer, a sand cushion layer and mixed lime soil are usually backfilled and tamped.

In engineering construction, various soft foundation structures are frequently encountered, when a target building needs to span a common ground base band and a settlement band, a common method is to dig, replace and fill the settlement band and tamp the settlement band layer by layer, the tamping operation amount is large, and due to the difference between the replacement and filling composite soil and the soil structure of the surrounding common foundation band, the settlement resistance and the supporting capacity are different, and the settlement difference is easy to occur in the later period.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a backfill miscellaneous soil composite foundation structure has solved the problem of proposing in the above-mentioned background art.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a backfill miscellaneous soil composite foundation structure, includes ordinary ground baseband and settlement zone, the settlement zone is dug and is equipped with the foundation ditch to the foundation ditch all is provided with the step portion that extends to ordinary ground baseband to both sides, it has grey sandy soil layer to backfill between foundation ditch and the step portion top to the main pile hole has been seted up to the foundation ditch bottom, the inside of ordinary ground baseband has been seted up and has been assisted the stake hole to the inside in main pile hole and assistance stake hole all is provided with first steel reinforcement cage, grout has been pour between main pile hole, assistance stake hole and the first steel reinforcement cage, grey sandy soil layer's top is backfilled and has been had graded gravel layer to graded gravel layer's top is provided with the second steel reinforcement cage, concrete layer has been pour to the inside and the outside of second steel reinforcement cage.

Preferably, the top of ordinary ground baseband and the both sides that are located grey sand soil layer, gradation metalling and concrete layer all are provided with the tamping layer, the top on tamping layer is provided with the screed-coat.

Preferably, the sand-lime soil layer, the graded broken stone layer and the concrete layer form an inverted trapezoidal hierarchical structure, and the first reinforcement cage and the second reinforcement cage form a bridge structure.

Preferably, the inside of the second reinforcement cage and the top end of the first reinforcement cage are mutually bound, and the distribution density of the main pile holes is greater than that of the auxiliary pile holes.

Preferably, the subsidence area comprises a subsidence center belt and a buffer area, and the width of the subsidence area is less than the width of the foundation pit.

Advantageous effects

The utility model provides a backfill miscellaneous soil composite foundation structure. Compared with the prior art, the method has the following beneficial effects:

the backfill miscellaneous soil composite foundation structure comprises an inverted trapezoidal hierarchical structure consisting of a gray sand layer, a graded gravel layer and a concrete layer, a bridge structure consisting of a first reinforcement cage and a second reinforcement cage, the bridge structure longitudinally disperses stress by the concrete layer and the second reinforcement cage structure, so that the first reinforcement cage structure disperses and bears main stress, the gray sand layer and the graded gravel layer are supported and simply compacted without tamping, the tamping operation amount is reduced, the graded gravel layer, the gray sand layer, the second reinforcement cage and the concrete layer are jointly used as a pile end bearing layer, and the inverted trapezoidal stress structure disperses the stress of a pile hole structure to a common ground base belt, so that the anti-settling capacity of the gray sand layer and the graded gravel layer is the same, and the occurrence of inconsistent settling is reduced.

Drawings

FIG. 1 is a schematic diagram of a conventional structure in the prior art;

fig. 2 is a schematic view of the structure of the present invention.

In the figure: the construction method comprises the following steps of 1-common ground base band, 2-settlement area, 3-foundation pit, 4-step part, 5-sand-lime soil layer, 6-main pile hole, 7-auxiliary pile hole, 8-first reinforcement cage, 9-cement paste, 10-graded gravel layer, 11-second reinforcement cage, 12-concrete layer, 13-tamping layer and 14-leveling layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a backfill miscellaneous soil composite foundation structure comprises a common ground base band 1 and a settlement zone 2, wherein the settlement zone 2 comprises a settlement center band and a buffer zone, the width of the settlement zone 2 is smaller than that of a foundation pit 3, the foundation pit 3 is dug in the settlement zone 2, step parts 4 extending to the common ground base band 1 are arranged on two sides of the foundation pit 3, a gray sand soil layer 5 is filled between the top of the foundation pit 3 and the top of the step part 4, a main pile hole 6 is arranged at the bottom of the foundation pit 3, auxiliary pile holes 7 are arranged in the common ground base band 1, one to two auxiliary pile holes 7 are arranged on one side of the same cross section, first reinforcement cages 8 are arranged in the main pile hole 6 and the auxiliary pile holes 7, cement slurry 9 is poured between the main pile hole 6, the auxiliary pile holes 7 and the first reinforcement cages 8, a graded soil layer 10 is arranged on the backfill top of the gray sand 5, and the graded soil layer 10 are compacted only by adopting an automobile, the tamping operation is reduced, the second reinforcement cage 11 is arranged at the top of the graded gravel layer 10, the inside of the second reinforcement cage 11 is mutually bound with the top end of the first reinforcement cage 8, the distribution density of the main pile holes 6 is larger than that of the auxiliary pile holes 7, concrete layers 12 are poured inside and outside the second reinforcement cage 11, tamping layers 13 are arranged at the top of the common ground base band 1 and on two sides of the gray sand layer 5, the graded gravel layer 10 and the concrete layer 12, a leveling layer 14 is arranged at the top of the tamping layer 13, the gray sand layer 5, the graded gravel layer 10 and the concrete layer 12 form an inverted trapezoidal hierarchical structure, the inverted trapezoidal hierarchical structure is better and convenient to construct, the first reinforcement cage 8 and the second reinforcement cage 11 form a bridge structure, and the content which is not described in detail in the description belongs to the prior art known by the technicians in the field.

During construction, a foundation pit 3 is dug below a subsidence area, step portions 4 are excavated by extending towards the common ground base bands 1 on two sides, a main pile hole 6 and an auxiliary pile hole 7 are dug, a first reinforcement cage 8 is placed in the main pile hole 6 and the auxiliary pile hole 7, a sand-lime soil layer 5 is laid and compacted, the common ground base bands 1 on two sides are tamped, a graded gravel layer 10 is laid and compacted, the common ground base bands 1 on two sides are tamped, a second reinforcement cage 11 is bound and a concrete layer 12 is poured, the common ground base bands 1 on two sides are tamped, and a leveling layer 14 is laid.

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.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a backfill miscellaneous soil composite foundation structure, includes ordinary ground baseband (1) and settlement zone (2), its characterized in that: a foundation pit (3) is dug in the subsidence area (2), step parts (4) extending to the common ground base band (1) are arranged on both sides of the foundation pit (3), an ash-sand soil layer (5) is filled between the foundation pit (3) and the top of the step part (4), a main pile hole (6) is arranged at the bottom of the foundation pit (3), an auxiliary pile hole (7) is arranged inside the common ground base band (1), and the inside of the main pile hole (6) and the auxiliary pile hole (7) are both provided with a first reinforcement cage (8), grout (9) is poured among the main pile hole (6), the auxiliary pile hole (7) and the first reinforcement cage (8), the top of the sand-lime soil layer (5) is back filled with a graded crushed stone layer (10), and the top of the graded crushed stone layer (10) is provided with a second reinforcement cage (11), concrete layers (12) are poured inside and outside the second reinforcement cage (11).

2. The backfill miscellaneous soil composite foundation structure of claim 1, wherein: the top of general ground zone (1) just is located the both sides of sand and dust soil layer (5), gradation gravel layer (10) and concrete layer (12) and all is provided with tamp layer (13), the top of tamp layer (13) is provided with screed-coat (14).

3. The backfill miscellaneous soil composite foundation structure of claim 1, wherein: the sand-lime soil layer (5), the graded gravel layer (10) and the concrete layer (12) form an inverted trapezoidal hierarchical structure, and the first reinforcement cage (8) and the second reinforcement cage (11) form a bridge structure.

4. The backfill miscellaneous soil composite foundation structure of claim 1, wherein: the inside of the second reinforcement cage (11) and the top end of the first reinforcement cage (8) are mutually bound, and the distribution density of the main pile holes (6) is greater than that of the auxiliary pile holes (7).

5. The backfill miscellaneous soil composite foundation structure of claim 1, wherein: the subsidence area (2) comprises a subsidence center belt and a buffer area, and the width of the subsidence area (2) is smaller than that of the foundation pit (3).