CN-122013786-A - Active adjustment pre-buried steel supporting system and active adjustment method thereof

Abstract

The invention provides an active adjustment embedded steel support system and an active adjustment method thereof, wherein the system comprises a driving assembly, an active support vertical rod piece and an active support single-side support rod; the foundation pit is internally provided with a mounting groove which is positioned between a first channel reinforced concrete support of the foundation pit and the bottom of the foundation pit, a driving assembly is fixedly arranged on the first channel reinforced concrete support, a driving end of the driving assembly is in transmission connection with one end of a driving support vertical rod piece, so that the driving support vertical rod piece is vertically inserted into the mounting groove in a lifting mode through the driving assembly, one end of a driving support single-side supporting rod is movably connected to the driving support vertical rod piece, the other end of the driving support single-side supporting rod can prop against a retaining ground wall, and a plurality of driving support single-side supporting rods are symmetrically arranged in pairs relative to the driving support vertical rod piece. The invention relates to the technical field of building engineering construction, and can solve the technical problems in the prior art.

Inventors

• XU QUANWEI
• LIU CHAOMING
• SONG WEIQING
• WANG LUJIE
• MEI YINGBAO
• LI YANDI
• JIAO CHANGKE
• LI JIAPING
• HUANG CHUNJIE
• YAN JINGYA
• PAN YITAO
• YAN JUN

Assignees

• 上海建工集团股份有限公司

Dates

Publication Date

20260512

Application Date

20260119

Claims (9)

1. 1. The active adjustment embedded steel support system is characterized by comprising a driving assembly, an active support vertical rod piece (7) and an active support single-side support rod (8), wherein an installation groove (10) is formed in a foundation pit, the installation groove (10) is positioned between a first reinforced concrete support (1) of the foundation pit and the pit bottom of the foundation pit, the driving assembly is fixedly arranged on the first reinforced concrete support (1), the driving end of the driving assembly is in transmission connection with one end of the active support vertical rod piece (7), the active support vertical rod piece (7) is vertically inserted into the installation groove (10) through the driving assembly in a lifting mode, one end of the active support single-side support rod (8) is movably connected to the active support vertical rod piece (7), the other end of the active support single-side support rod (8) can prop against a surrounding ground wall (3), and a plurality of active support single-side support rod pieces (8) are symmetrically arranged in pairs with respect to the active support vertical rod piece (7).
2. 2. The active regulation embedded steel supporting system of claim 1, wherein the driving assembly comprises a driving motor (5) and a reaction frame (6), the reaction frame (6) is fixedly arranged on the first reinforced concrete support (1), the driving motor (5) is fixedly arranged in the reaction frame (6), and the output end of the driving motor (5) is used as the driving end of the driving assembly to be in transmission connection with one end of the active support vertical rod piece (7).
3. 3. The active regulation embedded steel support system as claimed in claim 2, wherein the driving assembly further comprises a pressure sensor (4), and the pressure sensor (4) is installed between the top of one end of the active support vertical rod member (7) and the top of the reaction frame (6).
4. 4. The active regulation embedded steel support system as claimed in claim 1, wherein one end of the active support single-side supporting rod (8) is rotatably connected with the active support vertical rod (7) through a one-way ratchet wheel.
5. 5. The active regulation embedded steel supporting system of claim 1 or 4, wherein the other end of the active supporting single-side supporting rod (8) is provided with a unidirectional rotation supporting leg (9), and the unidirectional rotation supporting leg (9) can be abutted on the inner wall of the enclosure ground wall (3), so that the active supporting single-side supporting rod (8) is obliquely supported between the active supporting vertical rod piece (7) and the enclosure ground wall (3).
6. 6. An active adjustment method for actively adjusting a pre-buried steel supporting system according to any one of claims 1 to 4, comprising the steps of: the construction method comprises the following steps of 1, carrying out construction of a containment wall (3), a wall capping beam (2) and a first reinforced concrete support (1) before foundation pit construction; step 2, after the enclosure ground wall (3), the ground wall capping beam (2) and the first-channel reinforced concrete support (1) reach the design strength and meet the standard requirements, carrying out grooving construction at the installation position of the active adjustment embedded steel support system to form an installation groove (10); Step 3, symmetrically installing a plurality of active supporting single-side supporting rods (8) on two sides of the active supporting vertical rod piece (7) in pairs, and sinking the active supporting vertical rod piece (7) and the plurality of active supporting single-side supporting rods (8) into the installation groove (10); Step 4, driving the active supporting vertical rod piece (7) to move downwards through the driving motor (5) of the driving assembly, so that the unidirectional rotating supporting leg (9) on the active supporting single-side supporting rod (8) is tightly attached and fixed with the enclosure ground wall (3), and the enclosure ground wall (3) obtains initial internal supporting force; Step 5, performing foundation pit construction, wherein in the earthwork excavation and underground structure construction process of the foundation pit, the height position of the active supporting vertical rod piece (7) is dynamically adjusted through the driving motor (5) of the driving assembly, so that the enclosure ground wall (3) always obtains internal supporting force to control the lateral deformation of the enclosure ground wall (3); And 6, after the construction of the top plate of the underground warehouse of the underground structure is completed, removing the actively-adjusted embedded steel support system and plugging the reserved hole on the underground floor slab.
7. 7. The active adjustment method according to claim 6, wherein in the step 3, the grooving depth of the installation groove (10) and the sinking positions of the active support vertical rod (7) and the plurality of active support single-side supporting rods (8) are all above the excavation elevation of the foundation pit, and a certain single-side horizontal adjustable range is reserved between the unidirectional rotation supporting feet (9) on the active support single-side supporting rods (8) and the enclosure ground wall (3).
8. 8. The method according to claim 6, wherein in step 5, during the construction of the underground structure, an opening is reserved in the underground floor slab at the installation position of the actively-adjusted embedded steel support system, so that the actively-adjusted embedded steel support system penetrates the underground floor slab.
9. 9. The active adjustment method according to claim 6 or 8, wherein in the step 7, in the working state of the active adjustment pre-buried steel support system, the included angle between the active support single-side support rod (8) and the horizontal direction is θ, the length of the active support single-side support rod (8) is La, the horizontal projection length of the active support single-side support rod (8) is Lh, the tensile force of the driving assembly on the active support vertical rod (7) is Fv by the operation of the driving motor (5) of the driving assembly, and the internal supporting force obtained by the enclosure wall (3) is Fh, so that: , 。

Description

Active adjustment pre-buried steel supporting system and active adjustment method thereof Technical Field The invention relates to the technical field of building engineering construction, in particular to an active adjustment embedded steel supporting system and an active adjustment method thereof. Background In recent years, the construction industry of China is vigorous, a large number of underground spaces of buildings are developed and utilized, and higher requirements are also put on the construction of deep foundation pits, and the deep foundation pit engineering not only relates to the safe construction of underground structures, but also directly influences the safety and stability of surrounding buildings, roads and underground facilities. For convenience in construction and construction period guarantee, a system of an enclosure structure and a steel support is generally adopted in foundation pit construction to meet the requirement of foundation pit safety, however, in the process of foundation pit excavation, due to factors such as soil stress release, groundwater change and construction disturbance, a series of problems such as soil local collapse and earth surface subsidence are often caused, and even engineering accidents are caused in serious cases. Therefore, in the process of earth excavation, how to effectively control support deformation and settlement in the process of deep foundation pit excavation, and ensuring engineering safety and stability of surrounding environment are important points in the whole foundation pit construction safety system. In the prior art, in order to control the deformation of the foundation pit soil body and keep the foundation pit stable, according to the principle of 'supporting before digging', the steel supports are required to be erected layer by layer on the surface soil body and the excavation surface of the soil body, the steel supports mainly adopt preset pressure values, the axial force on the steel supports is controlled by adjusting jack hydraulic pressure, and the axial force condition of each steel support is dynamically adjusted, so that the most reasonable supporting axial force distribution state is realized. However, for the situation that the underground side or the complex foundation pit is close to, the steel support is more, the internal force of the enclosure structure and the internal support shaft force which is erected are continuously changed along with the increase of the excavation depth, the situation that part of the support shaft force is completely lost and even tension is generated possibly occurs, the enclosure deformation is increased due to light weight, and the support is unstable and falls off due to heavy weight, so that the support requirement is difficult to meet only by calculating the shaft force in advance. The foundation pit supporting system and the adjusting method thereof in the prior art have the following problems: 1) The prior art steel support construction process is complicated, and each steel support needs to be provided with an embedded pressing piece, and the axial force of the upper steel support is added again in the construction process, so that a scaffold is required to be erected for high-altitude operation, potential safety hazards exist, and the cost and the construction period are increased. 2) The steel support system in the prior art is a single stressed rod piece, the connecting point is weak, the prestress application difficulty is high, and the foundation pit collapse accident is easy to cause. 3) When adjusting the axial force of the steel support, problems may be caused by time limitation and excessive or insufficient loading force of the jack. Therefore, it is necessary to provide an active adjustment pre-buried steel support system and an active adjustment method thereof, which can solve the above technical problems. Disclosure of Invention The invention aims to provide an active adjustment embedded steel supporting system and an active adjustment method thereof, which can solve the technical problems. In order to achieve the above object, the technical scheme of the present invention is as follows: An active adjustment embedded steel support system comprises a driving assembly, an active support vertical rod piece and an active support single-side support rod, wherein an installation groove is formed in a foundation pit and is positioned between a first reinforced concrete support of the foundation pit and the bottom of the foundation pit, the driving assembly is fixedly arranged on the first reinforced concrete support, the driving end of the driving assembly is in transmission connection with one end of the active support vertical rod piece, so that the active support vertical rod piece can be vertically inserted into the installation groove through the driving assembly, one end of the active support single-side support rod is movably connected to the active support vertical rod pie