CN-121992830-A - Reinforced foundation and reinforcement design method

CN121992830ACN 121992830 ACN121992830 ACN 121992830ACN-121992830-A

Abstract

The invention relates to the technical field of buildings, in particular to a reinforced foundation and a reinforced design method, which creatively solves the problem of inclination of the existing building or the building under construction on the basis of conceptual design, engineering experience summary and mass calculation analysis. The reinforcement design method comprises the following steps of investigation of building conditions, geological investigation, deformation monitoring, formation of a preliminary reinforcement treatment method, scheme optimization comparison and selection, and implementation and verification of effects. The foundation and the reinforcement design method improve the overall rigidity of the foundation, the structure and the foundation, solve the problem of uneven settlement, have flexible construction, can be constructed in a small-level basement, and do not influence the ground operation. The foundation comprises an original pile foundation, an original bottom plate, a jet grouting pile, grouting and a newly added superimposed sheet. The key technology is to make full use of the existing foundation and the foundation and to perform deformation control and reinforcement by adopting optimized and selected high-quality design. Provides a new concept and a new technology for solving the complex problems of rock-soil and structural engineering, and has wide application prospect.

Inventors

LIU ZHONGCHANG
SHU ZHAORAN
LIU XU
SHAN MING

Assignees

辽宁省建筑设计研究院岩土工程有限责任公司

Dates

Publication Date: 20260508
Application Date: 20251211

Claims (10)

1. A reinforced foundation is characterized by comprising an original pile foundation, an original base plate (2), jet grouting piles, grouting and newly-added superimposed plates (7), wherein the original pile foundation is an existing building pile foundation, the original base plate (2) is a building construction base plate, the jet grouting piles are jet grouting pile bodies formed under the original base plate, between the original pile foundations and at the periphery of a building by adopting a high-pressure jet grouting method, the grouting is cement slurry injected under the original base plate, between the original pile foundations and at the periphery of the building by adopting a pressure method, and the newly-added superimposed plates (7) are reinforced concrete raft plates arranged on the original base plate (2).
2. The reinforced foundation according to claim 1, wherein the newly added superimposed sheet (7) is connected to the original base plate (2) through additional planting bars (5) in the original base plate to form an integral stress member.
3. A reinforced foundation according to claim 1, wherein the newly added superimposed sheet roof reinforcement (6) in the newly added superimposed sheet (7) is embedded in the shear wall to form an integral stress member.
4. The reinforcing design method for the reinforced foundation is characterized by comprising the following steps of: S101, investigating the inclination and crack conditions of a building, primarily judging the reasons of the inclination and crack accidents, and making pile foundation monitoring, geological investigation and deformation monitoring schemes; S102, pile foundation detection and geological investigation at a construction stage are carried out, and the conditions of a foundation and a pile end bearing layer are ascertained; s103, implementing deformation monitoring, and analyzing the settlement and inclination development trend of the building; s104, comprehensively investigating, surveying and monitoring results, and analyzing the reasons of the inclination and the cracks of the building to form a preliminary reinforcement treatment method; s105, optimizing and selecting a reinforced foundation base reinforcement scheme through reinforcement design schemes; and S106, implementing reinforcement design and continuously monitoring verification effect.
5. The method for reinforcing foundation pit according to claim 4, wherein the step S104 is characterized in that the method for analyzing the reasons of the inclination and the cracks of the building comprises the steps of combining pile foundation detection, geological survey results and deformation monitoring data, judging whether the pile end bearing layer meets the design requirements, analyzing the influence of the distribution unevenness of the foundation pit layer, erosion cracks or karst cave development conditions and construction process defects on the integrity of the pile body, and determining the dominant factors of uneven settlement.
6. The method according to claim 4, wherein the optimization and comparison of the reinforcing design scheme in S105 includes the combination of the composite foundation of the jet grouting pile and the newly added reinforced concrete superimposed sheet scheme, the whole grouting reinforcement is performed on foundation soil within the pile length range, the insufficient bearing capacity of the original hole digging pile is compensated by utilizing the jet grouting pile, and meanwhile, the integral raft foundation is formed by adding the reinforced concrete superimposed sheet on the original bottom plate, so that the integral rigidity of the foundation is improved and the differential settlement is coordinated.
7. The method for reinforcing a foundation according to claim 6, wherein in the scheme of combining the composite foundation of the jet grouting piles with the newly added reinforced concrete superimposed sheet, at least two rows of jet grouting piles are additionally arranged on the outer side of the basement on one side of the inclined direction of the building, and the jet grouting piles and the raft expansion part form a pile-raft combination together so as to control the inclination of the building body.
8. The method of claim 4, wherein the step S106 includes a step of calculating and adjusting the deformation of the foundation, and a step of leveling the rigidity of the composite foundation according to the compressive strength levels of the two reinforcements of the original bored pile and the jet grouting pile, and taking into account the improvement of the deformation modulus of the foundation soil between piles after grouting reinforcement.
9. The method of claim 4, wherein the analyzing the inclination of the building in S104 includes analyzing the influence of frost heaving on the foundation soil, wherein the unidirectional frost heaving force of the backfill soil on the building after the backfill soil is frozen and thawed in winter aggravates the inclination of the building body when the foundation trench is backfilled on one side of the building and the backfill soil is not backfilled on the other side of the building.
10. The method according to claim 4, wherein in S106, after the reinforcement design is performed, settlement observation is continuously performed on the building until the inclination amount of each building body reaches a stable state.

Description

Reinforced foundation and reinforcement design method Technical Field The invention relates to the technical field of buildings, in particular to a reinforced foundation and a reinforcing design method. Background In the field of construction, the phenomena of uneven settlement, inclined cracking of the ground and the wall body and the like of a building are common engineering quality problems, and most of the problems are caused by uneven foundation or insufficient foundation strength. Taking actual engineering as an example, the project is located in Mingshan area Liang Gucun of Benxi Taizi river, and comprises 1# -4# building, wherein the main building body is a high-rise house with 17 layers of shear wall structures, the height is up to 51.20m, and a basement is arranged; in the construction process, obvious ground uneven settlement, wall cracking and building inclination phenomena occur in four buildings, in the period of 9 months in 2013, the construction of 1# building main body, 3# building main body and 4# building main body is carried out, when the construction of 2# building main body structure is carried out to 5 floors on the ground, the inclination of the building surface is obvious, the 500 line rechecking difference on the north and south sides is large, the bottom layer is particularly prominent, the difference of more than 40mm at most, 9 floors is gradually reduced, the water accumulation on the south side of a basement is serious after 3# building and 4# building rains, oblique cracks caused by uneven settlement occur in the shear wall of the basement on the south side of 3# building ⑨ shaft and one floor wall part, the construction unit is immediately stopped after finding out a problem, investigation is carried out by consignment related units, the investigation is carried out by the construction site, the inclination and crack accidents are mainly caused by larger uneven settlement of foundation, supplementary investigation, monitoring and detection schemes are formulated accordingly, geological conditions and karst development conditions of the foundation are monitored by supplementary investigation and deformation monitoring, the construction settlement and inclination development conditions are monitored, the settlement and inclination settlement conditions are analyzed, and the uneven settlement of foundation settlement caused by the foundation pile inclination and uneven settlement is obtained, and the uneven settlement bearing capacity caused by the foundation settlement is obtained. Aiming at the problems, the traditional treatment methods often have a plurality of limitations, such as high construction difficulty, high requirements on site conditions, difficult effective implementation in the interior space of a basement with smaller layer height, high cost, huge treatment cost, heavy economic burden on engineering construction, poor treatment effect, incapability of effectively controlling uneven settlement of a building and difficult guarantee of long-term stability and safety of the building. In view of the above, in the case of processing a plurality of engineering quality accidents, through long-term practice and intensive research, the development and the development of the unit provide an innovative reinforced foundation and a design method, which aim to effectively solve the problem of uneven settlement of a building, overcome the defects of the traditional processing method and provide a more reliable, efficient, economical and reasonable solution for guaranteeing the quality of the building engineering. Disclosure of Invention In order to solve the problems, the invention provides a reinforced foundation and a reinforcing design method, which improve the overall rigidity of the foundation, the structure and the foundation, solve the problem of uneven settlement, are flexible in construction, can be constructed in a small-level basement, and do not affect the ground operation. The technical scheme of the invention is as follows: A reinforced foundation comprises an original pile foundation, an original bottom plate, jet grouting piles, grouting and newly-added superimposed plates, wherein the original pile foundation is an existing building pile foundation, the original bottom plate is a building construction bottom plate, the jet grouting piles are jet grouting pile bodies formed under the original bottom plate, between the original pile foundations and at the periphery of the building by adopting a high-pressure jet grouting method, the grouting is cement slurry injected under the original bottom plate, between the original pile foundations and at the periphery of the building by adopting a pressure method, and the newly-added superimposed plates are reinforced concrete raft plates arranged on the original bottom plate. The newly added superimposed sheet is connected with the original base plate through the additional planted bars in the original base plate to form