JP2023501743A - Foundation pit support method in geological conditions where stones are mixed in the soil layer - Google Patents

Abstract

Step S1 of conducting a geological survey to determine the location of stones in the foundation pit excavation path; Step S2 of surveying and locating the foundation pit boundary; processing, that is, the drilling machine first drills large holes in the upper soil layer of stones, then inserts the protective pipes into the large holes, respectively, and then drills small holes with stones through the protective pipes. Next, a step S3 in which a hydraulic cleaving device is inserted into the small hole and the stone is cut open by the hydraulic cleaving device to create a single crack; A method for supporting a foundation pit in a geological condition in which stones are mixed in the soil layer including S4, wherein the shoring structure comprises a plurality of insert plates and connecting plates, and the connecting plates correspond to the insert plates on both sides. A foundation pit support method in a geological condition in which stones are mixed in a soil layer provided with an engagement groove. The present invention is intended to solve the problem that conventional foundation pit shoring cannot penetrate stones in geological conditions where stones are mixed in the soil layer. In addition to saving time, it does not pollute the environment.

Description

The present invention relates to a method for supporting a foundation pit under geological conditions in which stones are mixed in the soil layer.

In the construction process of new foundation pit excavation, different types of foundation pit support structure have been widely applied, including I-type steel pile support, Larzen type steel sheet pile support, cement mixed pile support and so on. In the case of geological conditions where many large-volume stones are mixed in the soil layer, none of the pile heads of I-type steel, Larzen type piles, or cement-mixed piles can penetrate the stones, and these shoring structures It became impossible to apply all of them directly, and it was necessary to blast or crush the stone, excavate beyond the reference line, replace the soil, set up support piles, and then cut the roots again. In addition to soaring investment and extension of construction period, it is easy to cause safety accidents and affect surrounding roads and buildings.

The technical problem to be solved by the present invention is that the conventional foundation pit shoring under geological conditions where stones are mixed in the soil layer cannot pierce the stones, and the stones are blasted or crushed to meet the standards. It is necessary to excavate beyond the line, replace the soil, set up support piles, and then cut roots again. In order to solve the problems that arise, the object is to provide a foundation pit support method in geological conditions where the soil layer is mixed with stones.

In order to solve the above problems, the technical means for solving the problems of the present invention are:
Step S1 of conducting a geological survey to determine the location of stones in the foundation pit excavation path;
step S2 of surveying and determining the position of the foundation pit boundary;
a step S3 in which the boring machine processes stones along the boundary of the foundation pit shoring;
A foundation pit support method for a geological condition in which stones are mixed in the soil layer, including a step S4 of providing a shoring structure in the drilled hole, then digging the surface layer, installing steel girders, and driving in steel sheet piles. be.

When performing step S3, a hole is made to pierce the stone.

The shoring structure is provided with a protective tube, the protective tube passes through a hole, an I-shaped steel is provided in the protective tube, and cement paste is filled between the I-shaped steel and the protective tube.

When performing step S3, the drilling machine first makes a plurality of large holes in the soil layer above the stones, and then inserts the protection tubes into the plurality of large holes respectively, and then passes the protection tubes to make small holes with stones. Drill and then insert a hydraulic cleaver into the eyelet and cut open the stone with the hydraulic cleaver to create a cleft.

The shoring structure comprises a plurality of insert plates and connecting plates, both sides of the connecting plates are provided with corresponding engagement grooves for the insert plates, and the hydraulic cleaving device cuts open the stone to form a cleft. After forming, the pile driver first inserts each insertion plate into the gap between two adjacent protection tubes, then removes the hydraulic cleaving device and protection tube, and inserts the connecting plate into the gap between the insertion plates. do.

Useful effects of the present invention are as follows.
1. Low construction cost and short construction period. If such a foundation pit support method is adopted, construction costs are reduced by 40% or more compared to the process of excavating beyond the reference line, replacing the soil, and cutting roots again. In addition to saving the construction period, it does not pollute the environment.
2. The land occupied area is small, the adaptability to the surrounding topography is strong, and the safety is high. There are basically no restrictions due to the surrounding terrain and buildings, and the excavation is done after the foundation pit support is completed, so it is highly safe and does not affect the surrounding roads and buildings.
3. After extracting the shoring structure, the recycling process can be realized, so as to increase the resource utilization rate and reduce the use and consumption of disposable materials as much as possible.
4. The pitch of the shoring structure can be adjusted according to the depth of the foundation pit, and is highly adaptable.

The present invention will be further described below with reference to the drawings.
1 is a top structural view of Example 1. FIG. 1 is a front structural view of Example 1. FIG. FIG. 10 is a top structural view of Example 2; FIG. 10 is a front local cross-sectional structural view of Example 2; FIG. 10 is a local cross-sectional structural view of Example 2; FIG. 10 is a local top structural view of Example 2;

a step S1 of conducting a geological survey to determine the position of the stone 5 in the foundation pit excavation path;
a step S2 of surveying the foundation pit boundary and performing a positioning line;
a step S3 in which the drilling machine processes stones 5 along the boundary of the foundation pit shoring;
Foundation pit support under geological conditions where stones are mixed in the soil layer, including a step S4 of providing a shoring structure in the drilled hole, excavating the surface layer, installing the steel girder 4, and driving the steel sheet pile 1. The method.

Two types of shoring construction are further described below.
(Example 1)

When the thickness of the stone 5 is less than 1 m, a shoring structure composed of a PE protective tube 2 and an I-shaped steel 3 can be used, and when implemented, as shown in FIGS. 1 and 2, a drilling machine pierce the stone 5, then apply lubricating oil to the inner wall of the protective tube 2, insert the protective tube 2 into the drilled hole, lower the I-shaped steel 3 into the drilled hole, and separate the I-shaped steel 3 and the protective tube 2 Fill the cement paste between and, after the cement paste hardens, excavate the soil or stone of about 50 cm in the surface layer of the soil layer, attach the steel girder 4, drive in the steel sheet pile 1, and after the root cutting is completed, pile driving The PE protective tube 2 and the I-shaped steel 3 are extracted by the machine and reused.
(Example 2)

When the thickness of the stone 5 is 1 m or more and it becomes difficult for the drilling machine to pierce the stone 5, a shoring structure composed of a plurality of insert plates 7, connecting plates 6 and steel protection pipes 2 is used. It can be used and implemented, as shown in FIGS. 5 and 6, the drilling machine first makes a large hole in the soil layer above the stone 5, then inserts the steel protection tube 2 into the large hole, and then A small hole is made with a stone 5, then a hydraulic cleaving device 8 is inserted into the small hole, and a plurality of hydraulic cleaving devices 8 cut open the stone 5 to create a single 2-3 cm wide crack, and then a pile The hammer first inserts each insertion plate 7 into the gap between two adjacent protective tubes 2 , then removes the hydraulic cleaving device 8 and protective tube 2 , and both sides of the insertion plate 7 are connected to the connecting plate 6 . The connecting plate 6 is inserted into the gap between the insertion plates 7 so as to be in the engagement groove, the stone 5 and the soil layer are fixed by sandwiching the insertion plate 7, and then the pile driver drives the steel sheet pile 1, The steel girders 4 are installed to complete the installation of the shoring around the foundation pit.

1 steel sheet pile 2 protection tube 3 I-shaped steel 4 steel girder 5 stone 6 connecting plate 7 insertion plate 8 hydraulic cleaving device

Claims (5)

a step S1 of conducting a geological survey to determine the location of the stone (5) in the foundation pit excavation path;
step S2 of surveying and determining the position of the foundation pit boundary;
a step S3 in which the boring machine processes stones (5) along the boundary of the foundation pit shoring;
After providing a shoring structure in the drilled hole, the surface layer is excavated, the steel girder (4) is installed, and the steel sheet pile (1) is driven into the soil layer. Foundation pit support methods in mixed geological conditions. 2. The method for supporting a foundation pit in a geological condition in which stones are mixed in the soil layer according to claim 1, characterized in that when performing step S3, a hole is made so as to pierce the stone (5). The shoring structure is provided with a protective tube (2), the protective tube (2) passes through a drilled hole, and an I-shaped steel (3) is provided inside the protective tube (2), and the I-shaped steel (3) and 3. A method for supporting a foundation pit under geological conditions in which stones are mixed in the soil layer according to claim 2, characterized in that cement paste is filled between the protective pipe (2). When carrying out the above step S3, the drilling machine first makes a plurality of large holes in the soil layer above the stone (5), and then inserts the protection tubes (2) into the plurality of large holes respectively, and then the protection tubes ( 2) through which a small hole is made with a stone (5), then a hydraulic cleaver (8) is inserted into the small hole and the hydraulic cleaver (8) cuts open the stone (5) to create a cleft. A method for supporting a foundation pit in a geological condition in which the soil layer is mixed with stones, according to claim 1, characterized in that it creates a foundation pit. Said shoring structure comprises a plurality of inserting plates (7) and connecting plates (6), both sides of the connecting plate (6) are provided with corresponding engaging grooves for the inserting plates (7), hydraulically operated After the cleaving device (8) cuts open the stone (5) to create a cleft, the piling machine first inserts each insert plate (7) into the cleft between two adjacent protective tubes (2). 5. The method according to claim 4, characterized in that the hydraulic cleaving device (8) and the protection tube (2) are subsequently removed and the coupling plate (6) is inserted into the gap between the insertion plates (7). , foundation pit support method in geological conditions with mixed stones in the soil layer.

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