Construction method for quick support changing stress structure of bottom plate cushion layer

Abstract

The invention discloses a bottom plate cushion layer rapid support changing stress structure construction method which comprises the following steps that the excavation range of a bearing platform is merged, so that large-area excavation can be conducted in an excavation area, and cushion layer construction conditions are met; the foundation pit is excavated to the elevation position where a large-area bearing platform can be excavated, and a supporting structure is arranged in the foundation pit along the side wall; a bottom plate cushion layer is poured to the edge of the supporting structure in a large area at the elevation position so as to form support replacement for the supporting structure, and the position of a bearing platform is reserved on the bottom plate cushion layer during pouring; after the bottom plate cushion layer is formed through pouring, excavation is conducted at the reserved position of the upper bearing platform of the bottom plate cushion layer; according to the construction method, the working procedures are optimized, pouring of the bottom plate cushion layer is advanced, the foundation pit bottom rapidly has support changing conditions for the supporting structure, deformation of the supporting structure is controlled, then construction of the bearing platform cushion layer is conducted, the pit bottom is rapidly closed, and conditions are created for rapid forming of the bottom plate.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a construction method for a bottom plate cushion layer fast-replacement support bearing structure. Background Art

[0002] The support structure of foundation pits in soft soil areas generally has large deformations, and the rapid sealing of the pit bottom is crucial to the safety of the foundation pit. The usual construction method is to construct the foundation brick membrane after the excavation is completed, but it will cause the foundation pit to be exposed for a long time, affecting the safety of the foundation pit. In soft soil areas, the foundation pit edge foundation generally needs to be excavated in the form of skipping, which makes the construction more complicated. Summary of the Invention

[0003] In order to overcome the defects in the prior art, the present invention provides a construction method for a base plate cushion layer fast-changing support load-bearing structure, optimizes the construction process, replaces the original skip-excavation construction plan, simplifies the construction steps, and improves construction efficiency.

[0004] In order to achieve the above object, the present invention provides a method for constructing a stress-bearing structure with a rapid replacement of a bottom plate cushion layer, comprising the following steps:

[0005] The excavation range of the foundation pile is consolidated so that the excavation area can be excavated on a large scale and conditions for cushion layer construction are met;

[0006] Excavate the foundation pit to an elevation where a large-scale cap can be excavated, and set up support structures along the side walls of the foundation pit;

[0007] Pour the bottom plate cushion layer over a large area at the elevation to the edge of the supporting structure to form a replacement support for the supporting structure, and reserve the position of the pedestal on the bottom plate cushion layer during pouring;

[0008] After the bottom slab cushion is cast and formed, excavation is carried out at the reserved area for the bearing platform on the bottom slab cushion;

[0009] Pour the foundation cushion layer at the excavation location and perform waterproofing on the excavation location.

[0010] Preferably, when the excavation range of the pedestal is merged so that the excavation area can be excavated on a large scale and the conditions for cushion layer construction are met, for pedestals with a spacing of less than 2h, multiple pedestals in the overlapping excavation area will be excavated as a whole, where h is the pedestal height, which is determined according to the soil friction angle and self-stabilization angle under the geological conditions of each area.

[0011] Preferably, the bottom plate cushion layer is poured over a large area at a high elevation to the edge of the supporting structure to form a support for the supporting structure, and when pouring, a pedestal position is reserved on the bottom plate cushion layer, and a wooden formwork is set at the reserved position of the pedestal position to separate the pedestal position and other areas on the bottom plate cushion layer.

[0012] Preferably, when pouring the cap cushion layer at the excavation location and performing waterproofing treatment on the excavation location, the treatment method includes:

[0013] The side walls of the pedestal are cast directly in the wooden formwork.

[0014] Preferably, when pouring the cap cushion layer at the excavation location and performing waterproofing treatment on the excavation location, the treatment method includes:

[0015] Construct brick membrane on the foundation cushion as a waterproof base.

[0016] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0017] The process is optimized, and the bottom plate cushion layer is poured first, so that the bottom of the foundation pit can quickly meet the conditions for replacing the support structure, control the deformation of the support structure, and then carry out the foundation cushion layer construction to quickly close the bottom of the pit and create conditions for the rapid formation of the bottom plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a flow chart of a method for constructing a fast-replacement support bearing structure of a bottom plate cushion layer according to an embodiment of the present invention.

[0020] Figure 2 1. It is a schematic top view of pouring the bottom plate cushion layer in an embodiment of the present invention.

[0021] Figure 3 It is a schematic diagram of the pouring elevation of the bottom plate cushion layer in an embodiment of the present invention.

[0022] The corresponding relationship of the reference numbers in the accompanying drawings is as follows:

[0023] 1-Support structure; 2-Bottom cushion layer; 3-Reserved position for the pedestal. DETAILED DESCRIPTION

[0024] The following is a further description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0025] See also Figures 1 to 3As shown, the present invention provides a method for constructing a bottom plate cushion layer fast-replacement support bearing structure, comprising the following steps:

[0026] The excavation range of the foundation pile is consolidated so that the excavation area can be excavated on a large scale and conditions for cushion layer construction are met;

[0027] Excavate the foundation pit to an elevation where a large-area foundation pile can be excavated, and set up a supporting structure 1 along the side walls of the foundation pit;

[0028] Cast the bottom plate cushion layer 2 to the edge of the supporting structure 1 in a large area at the elevation to form a replacement support for the supporting structure 1, and reserve the position of the pedestal on the bottom plate cushion layer 2 during casting;

[0029] After the bottom plate cushion layer 2 is cast and formed, three locations are reserved for excavation at the base plate cushion layer 2. It should be noted that in this embodiment, a suitable excavator such as PC120 or PC60 is used to excavate the base plate soil;

[0030] The pedestal cushion layer is poured at the excavation location and the excavation location is waterproofed. The pedestal cushion layer can be constructed simultaneously with the subsequent operations of the base plate.

[0031] Furthermore, when the excavation range of the pedestals is merged so that the excavation area can be excavated on a large scale and has the conditions for cushion layer construction, for pedestals with a spacing of less than 2h, multiple pedestals in the overlapping excavation area will be excavated as a whole, thereby reducing the construction difficulty and achieving large-scale excavation and cushion layer construction conditions. Among them, h is the height of the pedestal, which is determined according to the friction angle and self-stabilization angle of the soil under the geological conditions of each area. It should be noted that when the spacing is less than 2h, the soil cannot be sloped, and the average excavation speed of the soil between two adjacent pedestals is faster than the speed of slope repair. For spacing greater than or equal to 2h, normal excavation is carried out.

[0032] Furthermore, a large-scale base slab is poured at a high elevation to the edge of the support structure to provide a support for the support structure. During pouring, a space for the pedestal is reserved on the base slab. Wooden formwork is installed at the reserved space for the pedestal to separate the pedestal from the rest of the base slab. During subsequent excavation, the concrete on the wooden formwork does not need to be removed. Preferably, if the foundation pit is severely deformed and the support structure needs to be stabilized as soon as possible, the base slab can be fully constructed, and some concrete removed when the pedestal is excavated.

[0033] It should be noted that when pouring the cap cushion at the excavation location and waterproofing the excavation location, the treatment methods include:

[0034] 1. For partitions set up with wooden formwork, the side walls of the pedestal are cast directly in the wooden formwork.

[0035] 2. For those without wooden formwork for separation, brick membrane shall be constructed on the pedestal cushion layer as waterproof base layer.

[0036] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A construction method for a fast-replacement support structure of a bottom plate cushion, characterized in that: The following steps are involved: The excavation range of the foundation pile is consolidated so that the excavation area can be excavated on a large scale and conditions for cushion layer construction are met; Excavate the foundation pit to an elevation where a large-scale cap can be excavated, and set up support structures along the side walls of the foundation pit; Pour the bottom plate cushion layer over a large area at the elevation to the edge of the supporting structure to form a replacement support for the supporting structure, and reserve the position of the pedestal on the bottom plate cushion layer during pouring; After the bottom slab cushion is cast and formed, excavation is carried out at the reserved area for the bearing platform on the bottom slab cushion; Pour the foundation cushion layer at the excavation location and perform waterproofing on the excavation location.

2. The method for constructing a bottom plate cushion layer fast-replacement support bearing structure according to claim 1, characterized in that: When the excavation range of the pedestal is merged so that the excavation area can be excavated on a large scale and the conditions for cushion layer construction are met, for pedestals with a spacing of less than 2h, multiple pedestals in the overlapping excavation area will be excavated as a whole, where h is the pedestal height, which is determined according to the soil friction angle and self-stabilization angle under the geological conditions of each area.

3. The method for constructing a fast-replacement support structure for a bottom plate cushion as claimed in claim 1, wherein The bottom plate cushion layer is poured over a large area at a high elevation to the edge of the supporting structure to form a replacement support for the supporting structure. When pouring, the pedestal position is reserved on the bottom plate cushion layer, and wooden formwork is set at the reserved position of the pedestal position to separate the pedestal position and other areas on the bottom plate cushion layer.

4. The method for constructing a fast-replacement support structure for a bottom plate cushion layer according to claim 3, characterized in that: When pouring the cap cushion layer at the excavation location and waterproofing the excavation location, the treatment methods include: Cast the side walls of the pedestal directly in the wooden formwork.

5. The method for constructing a bottom plate cushion layer fast-replacement support bearing structure according to claim 1, characterized in that: When pouring the cap cushion layer at the excavation location and waterproofing the excavation location, the treatment methods include: Construct brick membrane on the foundation cushion as a waterproof base.

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