Reverse butt joint construction method of soil-rock geological deep foundation pit
A construction method and technology of deep foundation pits, applied in infrastructure engineering, excavation, construction, etc., can solve the problems of low safety factor of construction environment, affecting the stability of earthwork slopes, and long construction period, so as to improve safety and improve work efficiency. Efficiency, accurate positioning effect
Active Publication Date: 2016-03-30
CHINA MCC20 GRP CORP
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[0002] When the construction of deep foundation pit encounters geological conditions where the upper half is soil layer and the lower half is rock layer, the upper half shall be excavated by earthwork, and the lower half shall be excavated by blasting. The work cycle of departmental review and selection of blasting materials is relatively long, and the vibration generated during blasting will affect the stability of the earthwork slope of the excavated foundation pit in the upper half. According to the conventional construction structure, it is necessary to wait until the foundation pit is excavated to the bottom. , construction from bottom to top, according to this method of construction, there will be disadvantages such as long construction period and low safety factor of construction environment
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[0015] Such as figure 1 and figure 2 Shown, a kind of soil-rock geological deep foundation pit reverse docking construction method of the present invention, it comprises the following steps:
[0016] Step 1, excavating the earthwork at the upper part of the foundation pit to the rock layer 3 at the lower part of the foundation pit;
[0017] Step 2: construction of the upper structure 1 of the rock layer; construction of the upper structure 1 of the rock layer and the anti-beam 2, the upper structure and the anti-beam are poured as a whole, the inner ring structure is provided with structural reinforcement 4, and the outer ring anti-beam is provided with anchor reinforcement bars 5;
[0018] Step 3, earthwork backfilling, earthwork around the structure that has been constructed in the foundation pit;
[0019] Step 4, blasting the lower rock layer of the foundation pit;
[0020] Step 5: After the rock layer is excavated to the bottom layer by blasting, the substructure const...
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The invention relates to deep foundation pit construction, in particular to a land rock geology deep foundation pit construction method. The land rock geology deep foundation pit reversed butt joint construction method includes the following steps: (1) excavating earth on the upper portion of a foundation pit till a rock layer on the lower portion of the foundation pit, (2) constructing a structure on the upper portion of the rock layer and a reversed beam, pouring the structure on the upper portion and the reversed beam to form a whole, arranging structure reserved reinforcing steel bars on the structure on an inner ring, and arranging anchoring reinforcing steel bars on the reversed beam on an outer ring, (3) conducting earth backfilling, namely backfilling the periphery of the constructed structure in the foundation pit with earth, (4) detonating the rock layer on the lower portion of the foundation pit, and (5) excavating the rocking layer till the bottom layer after the rock layer is detonated, constructing the structure on the lower portion from bottom to top, constructing the structure till the top portion, and enabling the structure to be in butt joint with the completely-constructed structure on the upper portion. The land rock geology deep foundation pit reversed butt joint construction method is easy, rapid and convenient to operate, and the construction safety performance is improved.
Description
technical field [0001] The invention relates to deep foundation pit construction, in particular to a deep foundation pit construction method of soil and rock geology. Background technique [0002] When the construction of deep foundation pit encounters geological conditions where the upper half is soil layer and the lower half is rock layer, the upper half shall be excavated by earthwork, and the lower half shall be excavated by blasting. The work cycle of departmental review and selection of blasting materials is relatively long, and the vibration generated during blasting will affect the stability of the earthwork slope of the excavated foundation pit in the upper half. According to the conventional construction structure, it is necessary to wait until the foundation pit is excavated to the bottom. , Construction from bottom to top, construction according to this method will have disadvantages such as long construction period and small construction environment safety facto...
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IPC IPC(8): E02D17/02
Inventor 杨前
Owner CHINA MCC20 GRP CORP