Horizontal frame construction and underground fending method using the same

Abstract

The invention provides a horizontal cage structure comprising linear parts and connecting parts like a Chinese character 'jing'. An underground encasing construction method adopting the horizontal cage structure comprises the following steps: a continuous wall and a middle column pile are arranged around a ground area where the underground structure is constructed; the ground area is dug to a preset depth and sand soil is discharged; a marginal beam is arranged on the inside of the continuous wall; the horizontal cage structure is arranged on the marginal beam and also arranged on the middle column pile; the ground area is further dug to a layer depth and the sand soil is also removed; the steps are repeated according to the required depth of the ground area and a plurality of horizontal cage structures are stacked; the bottom of the ground area which is dug according to the steps is provided with a backing board layer and vertical reinforcing parts are arranged between the connectingparts of the stacked horizontal cage structures; the middle column pile is removed; pillars are formed on the vertical reinforcing parts and the horizontal cage structures are viewed as permanent structures to form the underground structure.

Description

Technical field [0001] The shape of the horizontal skeleton structure involved in the building and the level of the horizontal skeleton structure involved in the level of the building, etc., and the horizontal support is used to prevent the excavated ground sand soil in the underground project of excavation foundation and build the underground layer project.The encirclement project, especially the horizontal skeleton structure and its methods of supporting the horizontal support, use the horizontal skeleton structure with good bending performance to resist the soil pressure, thereby minimizing the number of temporary vertical components, and can complete the fence to complete the fence.After the project, connect with permanent vertical components (pillars), and use the horizontal skeleton structure as a horizontal support for the soil pressure, so that the construction of the underground foundation mining project and underground structure becomes simpler, fast and economical. Ba...

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Problems solved by technology

[0007] When the continuous method is adopted, the diaphragm wall is a temporary structure, so it needs to be demolished during the underground structure engineering stage of the building, but the diaphragm wall will cause a sudden change during the demolition process imbalance of stress

Moreover, danger may occur during the demolition process, and it is difficult to carry out construction due to mutual interference with the underground structure, so not only the loss of raw materials is caused, but also there are problems such as the need to leave a predetermined time for the demolition operation

In addition, it may cause deformation of the surrounding ground to cause defects in the surrounding structure, and due to the small spacing of the intermediate support piles provided to prevent the bending of the horizontal supports, it hinders the progress of underground excavation work by the equipment, and The construction period is extended due to the interference of temporary components during the construction work

[0008] With the SPS method, since the pillars (PRD foundation) which are permanent vertical components are constructed before excavating the ground, the interval between the pillars is small and excavation work is difficult; As a permanent horizontal skeleton structure, the H-truss beam is connected to the pillar to play the role of horizontal support. However, due to the construction error of the pillar, the H-truss beam must be actually measured before manufacturing, so the construction period is lengthened, and because only The connection work with the pillar steel frame can be carried out by on-site welding, so there are difficulties in quality management

Also, the H-truss as a horizontal support needs to be able to resist large earth pressure, but the H-truss has a strong axis and a weak axis, and the size of the component is determined by the bending of the weak axis direction, so special Manufacture of H-truss with a large width will increase the volume and cost, and since the width of the H-truss as a horizontal support becomes large, it is difficult to install the reinforcement and formwork of the pillar formed by the steel frame and reinforced concrete group

[0009] When using the reverse method, since the operation of the tank wall and RCD foundation can only be carried out with large equipment, it is difficult to use in small or difficult-to-access places, and Since the pillars (RCD foundation) which are permanent vertical components are first constructed before the underground excavation work, the distance between the pillars is small and the underground excavation work is difficult; due to the upside-down method, it is difficult to connect the already poured upper part with the poured lower part the concrete

Also, the steel bars of the horizontal frame structure made of reinforced concrete interfere with the H-truss of the vertical structure already installed, so it is difficult to connect or handle, and it is difficult to perform quality control

In addition, due to construction errors in the vertical components set before excavating the foundation, it is difficult to compensate

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