Advanced support supporting structure and construction method thereof
A supporting structure and sheet pile technology, which is applied in basic structure engineering, excavation, construction, etc., can solve the problems of unstable force, high cost, large amount of materials, etc., achieve a strong level of resistance, save underground space, and improve The effect of economic benefits
Pending Publication Date: 2018-05-15
SHANGHAI ZHIPING FOUNDATION ENG CO LTD
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Problems solved by technology
[0004] (1) Horizontal concrete support and steel support require a large amount of materials, requiring a large number of column piles, greatly increasing the cost, and making it difficult to unearth;
[0005] (2) The inclined throwing bracing affects the construction of the bottom plate, and it is necessary to negotiate with the main design unit to set up a post-casting belt;
[0006] (3) The anchor rod or anchor cable is set outside the foundation pit, and the length often exceeds the red line range. When the soil quality is poor, the force is unstable;
[0007] (4) The double-row piles are composed of the rigid frame and crown beam connected by the front and rear rows of support piles and beams. The force-bearing form is still a cantilever. and the row spacing need to be increased, the cost is high, and the deformation control is not good, and the double-row pile support takes up a lot of space
Method used
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Embodiment 1
[0030] See attached figure 2 , first set the sheet pile 1 of the vertical slab support system along the excavation sideline of the foundation pit. After the support system reaches a certain strength, carry out the earthwork excavation to the top elevation of the crown and beam 4, and construct the rotary grouting pile 2 below the pit bottom. , the rotary grouting pile 2 can be constructed by a fully hydraulic crawler drilling rig, and the pile diameter can be 800mm in diameter, which can also be determined according to the bearing situation. The situation is determined; then use the vibration method to insert the "H" steel 3. The specific model and insertion depth of the "H" steel 3 are determined according to the stress situation. The equipment can use a manipulator with a vibrating hammer. Fixed diagonal brackets 19 are positioned as angles.
[0031] See attached image 3 , the oblique bracket 19 is a right-angled triangular support composed of a cross bar 9, a vertical b...
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The invention discloses an advanced support supporting structure and a construction method thereof. The advanced support supporting structure and the construction method thereof are characterized in that a supporting structure which is composed of an advanced support arranged in an inclined foundation pit and a plate pile is adopted, the advanced support is an inclined pile composed of a jet grouting pile and H-shaped steel, one end of the H-shaped steel is connected with a crown beam on the top of the plate pile, and the other end of the H-shaped steel is inserted in the jet grouting pile; and specific construction comprises the steps of supporting system, advanced support and crown beam arrangement, bottom plate construction and support dismounting. Compared with the prior art, the advanced support supporting structure has high horizontal resisting capability and is good in supporting effect, the underground space can be sufficiently saved, economic benefits are increased, and the advanced support supporting structure and the construction method thereof are particularly suitable for construction of foundation pit supporting projects in which the surrounding environment is complex, many existing buildings exist, and an excavated side boundary is close to a red line.
Description
technical field [0001] The invention relates to the technical field of foundation pit enclosure, in particular to an advanced support structure for silty soft soil layers and a construction method thereof. Background technique [0002] At present, for foundation pit support with large excavation area and excavation depth, slab support + inner support, slab support + anchor rod or anchor cable, double-row piles, etc. are mainly used. The slab support system is generally row piles, underground diaphragm walls, cement-soil interpolated steel, occlusal piles, etc. The internal support systems mainly include: horizontal concrete support, horizontal steel support, and diagonal cast support. Horizontal concrete supports can be in the form of opposite braces, angle braces, side trusses, and ring braces; horizontal steel supports can be in the form of opposite braces and angle braces; both horizontal concrete supports and steel supports need to set vertical columns in the foundation ...
Claims
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Login to View More IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 朱作猛王建军刘涛胡宝山张敏杰刘忠秋易娟
Owner SHANGHAI ZHIPING FOUNDATION ENG CO LTD