Construction device of non-reinforced spread foundation and construction method of rigid and flexible dual composite foundation

Abstract

The invention provides a construction device of a non-reinforced spread foundation and a construction method of a rigid and flexible dual composite foundation. The construction device of the non-reinforced spread foundation comprises a device body and a prefabricated L-shaped pinboard, wherein a second L-shaped baffle which can be in sliding fit with a first baffle is arranged on the L-shaped pinboard, and a feed opening, a discharge opening and a mixing inner cavity are formed in the device body. The method based on the device comprises the steps of preparing for construction and sinking a rigid pile; positioning a flexible pile, taking a drilling machine in place, drilling to form holes, and pouring lime to tamp layer by layer; constructing the non-reinforced spread foundation; excavating earthwork in a foundation pit, cutting a tubular pile, and filling a core; installing a steel bearing plate; and constructing a mattress layer. The invention provides the construction device of the non-reinforced spread foundation, and the device body is pulled to discharge during pouring, so that the construction of the non-reinforced spread foundation is convenient; additionally, the non-reinforced spread foundation is constructed between the rigid pile and the flexible pile, so that the whole foundation is in point-line connection, the overall carrying capacity is increased, and the building settlement probability due to natural environment influence after completion is reduced.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a reinforcement-expanded foundation construction device and a rigid-flexible dual composite foundation construction method based on the non-reinforced expansion foundation construction device. Background technique [0002] In the traditional composite foundation, the stress distribution between the pile and the soil is not uniform, which leads to certain restrictions on the application range and effect of the composite foundation technology. There are two main reasons for this. The interstitial soil has a high rigidity, and most of the load is carried by the rigid pile foundation first, and the interstitial soil bears very little, unless the rigid pile undergoes large compression deformation and settlement, and the interstitial soil participates in the load. Second, for muddy soft soil or similar saturated soft soil foundation, due to the low bearing capacity of the natural f...

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Problems solved by technology

Second, for muddy soft soil or similar saturated soft soil foundation, due to the low bearing capacity of the natural foundation, its stiffness is much different from that of rigid piles, and the bearing capacity of this part of the weak natural foundation cannot be utilized in the design of traditional composite foundations, so Traditional composite foundations are not suitable for silty soft soil or similar weak soil layers

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