CN212896447U

CN212896447U - Structure of manual hole digging cast-in-place pile foundation underpinning raft foundation

Info

Publication number: CN212896447U
Application number: CN202021180324.5U
Authority: CN
Inventors: 汪太珩
Original assignee: GUIZHOU ZHONGJIAN ARCHITECTURAL SCIENCE DESIGN INSTITUTE CO LTD
Current assignee: GUIZHOU ZHONGJIAN ARCHITECTURAL SCIENCE DESIGN INSTITUTE CO LTD; Guizhou China Construction Architecture Research and Design Institute Co Ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-04-06
Anticipated expiration: 2030-06-23

Abstract

The utility model discloses a structure of artifical hole bored concrete pile basis underpins raft foundation that digs, dig hole bored concrete pile basis, artifical construction hole and newly-increased manual work including existing frame post and existing raft foundation, newly-increased manual work and dig hole bored concrete pile dado, set up artifical construction hole on existing raft foundation of existing frame post periphery, there is construction space in the bottom excavation of existing raft foundation simultaneously, construction space and manual construction hole intercommunication, be equipped with newly-increased manual work and dig hole bored concrete pile dado in the bottom of existing raft foundation, pour newly-increased manual work and dig hole bored concrete pile basis in newly-increased manual work is dug hole bored concrete pile dado. The utility model discloses add the artifical bored concrete pile basis that digs hole of newly-increased under existing frame post, directly transmit the upper portion load to on the better ground bearing layer, avoided the nondeterminacy of the reinforced inhomogeneity of traditional high-pressure slip casting and result, also can reduce the social negative effect to the maximum extent when reducing time limit for a project, investment.

Description

Structure of manual hole digging cast-in-place pile foundation underpinning raft foundation

Technical Field

The utility model relates to a structure of artifical hole bored concrete pile basis underpins raft foundation that digs belongs to foundation stabilization construction technical field.

Background

The raft foundation is a foundation form commonly used in the engineering construction of China at the present stage by virtue of good integrity and stability, but when the mechanical properties of the foundation rock soil under the raft foundation are different, the uneven settlement of a building is often caused, so that the house has undesirable consequences such as cracking, inclination and the like. At this time, the foundation is generally reinforced by high-pressure grouting, but due to the non-uniformity of high-pressure grouting and uncertainty of the result, the effect after the reinforcement treatment is not ideal, and if the foundation of the house is reinforced again, the social negative effect is further increased.

SUMMERY OF THE UTILITY MODEL

To the not enough among the prior art, the utility model provides a simple and safe and reliable's of principle structure of artifical hole bored concrete pile basis underpins raft foundation can ensure the consolidated validity of foundation, when reducing time limit for a project and investment, also can reduce social negative effect to the at utmost.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a structure of artifical bored concrete pile foundation underpins raft foundation, includes existing frame post and existing raft foundation, newly-increased artifical bored concrete pile foundation, manual construction hole and newly-increased artifical bored concrete pile dado of digging, sets up artifical construction hole on existing raft foundation of existing frame post periphery, excavates there is construction space in existing raft foundation's bottom simultaneously, construction space and manual construction hole intercommunication, be equipped with newly-increased artifical bored concrete pile dado in existing raft foundation's bottom, pour newly-increased artifical bored concrete pile foundation in newly-increased artifical bored concrete pile dado, and newly-increased artifical bored concrete pile arranges under existing frame post.

Furthermore, the manual construction holes are arranged on the existing raft foundation at the peripheral non-intercolumn strip positions of the existing frame columns, and the total number of the positions of the manual construction holes can be four.

Further, the centers of the newly added manual hole digging cast-in-place pile and the newly added manual hole digging cast-in-place pile retaining wall coincide with the center of the existing frame column.

Furthermore, the size of the opening of the manual construction hole is not less than 800mm, so that the requirement of construction space is met.

Since the technical scheme is used, the utility model discloses an advantage has below: the utility model discloses add the artifical bored concrete pile basis that digs hole of newly-increased under existing frame post, directly transmit the upper portion load to on the better ground bearing layer, avoided the reinforced inhomogeneities of traditional high-pressure slip casting and the uncertainty of result. Therefore, the utility model discloses can ensure foundation stabilization's validity, when reducing time limit for a project and investment, also can reduce the social negative effect in the at utmost.

Drawings

FIG. 1 is a top view of the schematic structural diagram of the present invention

Fig. 2 is a sectional view a-a of fig. 1.

Description of reference numerals: 1-existing frame columns, 2-existing raft foundations, 3-newly-added manual hole digging cast-in-place pile foundations, 4-manual construction holes, 5-newly-added manual hole digging cast-in-place pile retaining walls and 6-construction space.

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.

Example 1

The embodiment of the utility model provides a: referring to fig. 1 and 2, a structure for underpinning a raft foundation by a manual hole digging cast-in-place pile foundation comprises an existing frame column 1, an existing raft foundation 2, a newly-added manual hole digging cast-in-place pile foundation 3, a manual construction hole 4 and a newly-added manual hole digging cast-in-place pile retaining wall 5, wherein the manual construction hole 4 is formed in the existing raft foundation 2 at the periphery of the existing frame column 1, a construction space 6 is dug at the bottom of the existing raft foundation 2, the construction space 6 is communicated with the manual construction hole 4, the newly-added manual hole digging cast-in-place pile retaining wall 5 is arranged at the bottom of the existing raft foundation 2, the newly-added manual hole digging cast-in-place pile retaining wall 5 is poured with the newly-added manual hole digging cast-in-place pile foundation 3, and the newly-added manual hole digging cast-in-place pile retaining wall 3 is arranged under the. The manual construction holes 4 are arranged on the existing raft foundation 2 at the peripheral non-intercolumn strip positions of the existing frame column 1, the manual construction holes 4 are provided with four positions in total, and during construction, one of the manual construction holes 4 is selected for hole opening construction. The centers of the newly added manually-excavated cast-in-place pile 3 and the newly added manually-excavated cast-in-place pile retaining wall 5 coincide with the center of the existing frame column 1. The diameter of the manual construction hole 4 is not less than 800 mm.

When the structure construction of the underpinning raft foundation of the manual hole digging cast-in-place pile foundation is carried out, firstly, manual construction holes 4 are formed in the existing raft foundation 2 at the positions of non-inter-column strips on the periphery of the existing frame column 1, meanwhile, a construction space 6 is dug at the bottom of the existing raft foundation 2, the construction space 6 is communicated with the manual construction holes 4, after the construction of the construction space 6 and the manual construction holes 4 is finished, a newly-increased manual hole digging cast-in-place pile protection wall 5 can be constructed under the existing frame column 1 in a manual mode, after the construction is carried out to a holding layer of design requirements, a newly-increased manual hole digging cast-in-place pile protection wall 5 is poured, the newly-increased manual hole digging cast-in-place pile 3 is supported at the bottom of the existing frame column 1, and therefore the purpose of underpinning the existing raft foundation 2 by the newly-increased manual hole digging cast-in-place.

And when the newly-added manual hole digging cast-in-place pile foundation 3 is poured, adopting commercial concrete doped with 10% of micro-expansion agent.

The newly-added manual hole digging cast-in-place pile protecting wall 5 is composed of more than two sections of single protecting walls, and the height of each section of single protecting wall is not more than 500 mm.

The bottom of the existing raft foundation 2 is chiseled at the position contacted with the newly-added manual hole digging cast-in-place pile foundation 3, so as to ensure the reliable connection of new and old concrete.

Pile body reinforcing steel bars of the newly-added manual hole digging cast-in-place pile foundation 3 are anchored into the existing raft foundation 2 by adopting a bar planting process, and the length of the planted bars is not less than 15 times of the diameter of the planted bars.

To sum up, the utility model discloses add the manual work of newly-increased and dig hole bored concrete pile basis 3 under existing frame post 1, directly transmit the upper portion load to better ground bearing layer on, avoided the reinforced non-uniformity of traditional high pressure slip casting and the uncertainty of result, consequently, the utility model discloses can ensure the reinforced (rfd) validity of ground basis, when reducing time limit for a project and investment, also can reduce the social negative effect to the maximum extent.

Claims

1. The utility model provides a structure of artifical bored concrete pile foundation underpins raft foundation that digs hole, includes existing frame post (1) and existing raft foundation (2), newly-increased artifical bored concrete pile foundation (3), artifical construction hole (4) and newly-increased artifical bored concrete pile dado (5) of digging hole, its characterized in that: seted up artifical construction hole (4) on existing raft foundation (2) of existing frame post (1) periphery, excavated the bottom of existing raft foundation (2) simultaneously has construction space (6), construction space (6) and artifical construction hole (4) intercommunication, be equipped with newly-increased manual work and dig hole bored concrete pile dado (5) in the bottom of existing raft foundation (2), pour newly-increased manual work and dig hole bored concrete pile basis (3) in newly-increased manual hole bored concrete pile dado (5), and newly-increased manual hole bored concrete pile basis (3) arrange under existing frame post (1).

2. The structure of a manual hole digging cast-in-place pile foundation underpinning raft foundation of claim 1, wherein: the artificial construction holes (4) are arranged on the existing raft foundation (2) at the peripheral non-intercolumn strip positions of the existing frame columns (1), and the total number of the positions where the artificial construction holes (4) can be opened is four.

3. The structure of a manual hole digging cast-in-place pile foundation underpinning raft foundation of claim 1, wherein: the centers of the newly added manual hole digging cast-in-place pile foundation (3) and the newly added manual hole digging cast-in-place pile retaining wall (5) are coincided with the center of the existing frame column (1).

4. The structure of a manual hole digging cast-in-place pile foundation underpinning raft foundation of claim 1, wherein: the opening size of the manual construction hole (4) is not less than 800 mm.