Large-diameter mechanical pipe jacking construction technology for soft soil foundation in collapsible loess area
A technology for collapsible loess and soft soil foundations, which can be used in infrastructure engineering, underground chambers, earthwork drilling, etc. It can solve problems affecting pipe jacking construction, machine head settlement, soil disturbance, etc., and reduce construction costs. , The effect of increasing the bearing capacity and avoiding deviation
Active Publication Date: 2020-06-26
中建生态环境集团有限公司 +1
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AI Technical Summary
Problems solved by technology
The pipe jacking construction in the soft soil layer is prone to subsidence, deviation, drift and other phenomena, which will affect the pipe jacking construction and cause disturbance to the buildings around the pipe and the nearby soil
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] The invention provides a large-diameter mechanical pipe jacking construction process for soft soil foundations in collapsible loess areas, comprising the following steps:
[0027] S1: Carry out geological survey on the construction area to determine the location of the soft soil foundation; geological survey includes geotechnical survey and water quality survey.
[0028] S2: Soft soil foundation treatment, which includes:
[0029] S201. Arrange the positions of the pile holes and mark and number them. The pile holes are laid out in a square or rectangular matrix. Set to S a ,
[0030] S a = d a / 1.13√m;
[0031] In the formula, d a —Pile diameter, m—replacement rate;
[0032] Pile hole center distance S a The specific calculation process is:
[0033] The first step is to calculate the bottom pressure P of the pipe jacking machine k , P k =G k / A+r h+q,
[0034] In the formula, P k —Pipe jacking machine bottom pressure, G k - the weight of the pipe jacking...
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The invention relates to a large-diameter mechanical pipe jacking construction technology for a soft soil foundation in a collapsible loess area. The large-diameter mechanical pipe jacking construction technology comprises the following steps that S1: geological survey of the construction area is conducted so as to determine the position of the soft soil foundation; S2: soft soil foundation treatment is conducted; S3 : excavating of a mechanical pipe jacking working well and a receiving well are conducted, and installing of equipment is conducted; S4: machine head jacking is conducted; S5: pipe jacking is conducted; S6: measuring and correcting deviation are conducted; and S7: removing of grouting friction reducing equipment is conducted, wherein the step S2 comprises the following steps that S201, arrangement of pile hole position is conducted; S202, drilling rig in place and leveling are conducted, a grouting pipe with a nozzle is drilled to the set-depth soil layer by using a drilling rig, slurry is used to impact soil under high pressure so as to mix the soil and slurry to form a consolidation body in the soil, and the position from the working depth of a pipe jacking to the set depth is filled with plain concrete; and S203, pile foundation compacting and tamping are conducted, lime soil is adopted for backfilling and tamping in layers, symmetrical feeding in two directionsis conducted, filling can be cornuted after tamping reaming and compacting, and repeating is conducted until to the ground. By means of the large-diameter mechanical pipe jacking construction technology, a soft soil layer is reinforced, and the high economy is achieved.
Description
technical field [0001] The invention relates to the technical field of building construction, in particular to a construction technique for mechanically jacking large-diameter pipes on soft soil foundations in collapsible loess areas. Background technique [0002] In collapsible loess areas, due to local groundwater, springs, water supply and drainage pipeline damage and other factors, local soft soil foundations are formed, which has adverse effects on large-diameter pipe jacking construction. The soft soil foundation has a large natural water content, a large natural void ratio, high compressibility, low strength, low permeability coefficient, and low viscosity coefficient. The pipe jacking construction in the soft soil layer is prone to the phenomenon of machine head settlement, deviation, drift, etc., which will affect the pipe jacking construction and cause disturbance to the buildings around the pipeline and the nearby soil. Contents of the invention [0003] The te...
Claims
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IPC IPC(8): E21D9/10E21D11/10E02D5/46E02D3/08
CPCE21D9/10E21D11/10E21D11/105E02D5/46E02D3/08
Inventor 安东子孙金顺张云富谭国霞范洁田振国高奎王宴强
Owner 中建生态环境集团有限公司