The invention discloses a construction method suitable for an up-down overlapped tunnel with the small clear space and long distance under the weak geological condition. The up-down overlapped tunnel comprises an upper hole tunnel body and a lower hole tunnel body, wherein the tunnel diameter of the upper hole tunnel body is the same as that of the lower hole tunnel body, and the tunnel length of the upper hole tunnel body is largely equal to that of the lower hole tunnel body. Both the upper hole tunnel body and the lower hole tunnel body are of a tunnel structure formed by tube pieces, the vertical clear space between the upper hole tunnel body and the lower hole tunnel body is smaller than 0.7D(shield diameter), and the tunnel length is larger than 1000 m. The shield construction method includes the steps that after the lower hole tunnel body is completed according to a conventional shield construction method, the measures of a shield high-altitude starting platform, up-down tunnel interlayer soil body deep hole grouting reinforcement, lower hole tunnel supporting steel ring reinforcement, a shield high-altitude receiving platform and the like are taken, so that the influence on the formed lower hole tunnel body by shield construction of the upper hole tunnel body and the secondary overlapping effect of overlapped tunnel sedimentation are reduced, and it is guaranteed that deformation of the lower hole tunnel body and ground subsidence can be controlled. The overlapped tunnel shield construction method is of great reference value and practical significance to similar shield tunnel engineering and intensive deep-layer underground space exploitation and utilization.

Construction method suitable for up-down overlapped tunnel with small clear space and long distance under weak geological condition

The invention discloses a construction method for a tunnel boring off-contact sending and receiving platform of an up-down overlapped tunnel. The up-down overlapped tunnel comprises an upper tunnel body and a lower tunnel body. When the advancing directions of the upper tunnel body and the lower tunnel body are parallel, the two ends of the up-down overlapped tunnel are provided with tunnel boring vertical wells for sending and receiving of a tunnel boring machine. Each tunnel boring vertical well is provided with a bottom plate, a top plate, a middle support and a counterforce frame supporting middle plate; steel pipe supports are installed on the bottom plate; the tops of the steel pipe supports are sequentially provided with longitudinal double-splicing I-shaped steel and transverse double-splicing I-shaped steel and paved with a high altitude platform built with steel plates and the like; and accordingly the sending and receiving platform of the tunnel boring machine is formed. According to the construction method for the tunnel boring off-contact sending and receiving platform of the up-down overlapped tunnel, the influence of tunnel boring sending or receiving construction on the structure of the vertical wells can be reduced, and the safety of the plate structure is ensured. The construction method for the tunnel boring off-contact sending and receiving platform has very important reference value and practical significance to similar tunnel boring engineering, plate boring sending or receiving during metro interchange, development and utilization of deep and intensive underground spaces and the like.

Construction method for tunnel boring off-contact sending and receiving platform of up-down overlapped tunnel

The invention discloses a shield machine receiving steel platform which comprises a plurality of steel supporting upright posts, a thick steel plate and a steel bracket; under the condition that a medium plate structure is too late to construct, a steel upright post platform can be utilized for receiving a shield machine; a connecting system cross-welded and fixed by 20a I-shaped steels is adoptedamong the steel upright posts, so that the integrity is ensured to be formed among the steel upright posts, therefore, the stability is higher; the receiving bracket is welded with the 2-cm steel plate by adopting additionally-arranged I20a angle steels as an anti-slip stop block, so that the slippage of the shield machine is prevented, and the shield receiving safety is ensured.

Shield machine receiving steel platform

The invention discloses a rectangular tube push bench receiving method under a condition without a liner structure in a subway station. The method comprises the following steps that 1, the subway station and a subway entrance-exit channel are constructed in the same term; 2, a rectangular tube push bench is hoisted from the upper portion in the subway station, and pipe sheet construction of the subway entrance-exit channel is completed; 3, a rectangular tube push bench receiving trail on a middle plate is disassembled, a temporary supporting column in the subway station is disassembled, then the middle plate of the subway station is thickened, and the elevation of the middle plate is identical to that of the top of a bottom tube sheet of the channel; 4, construction of side walls above themiddle plate of the subway station and a top plate continues. According to the method, under the premise of not influencing ground traffic, the entrance-exit channel is constructed.

Rectangular tube push bench receiving method under condition without liner structure in subway station

The invention provides an aerial steel platform for achieving the continuous construction of an overlapped tunnel and a construction method thereof. The overlapped tunnel comprises a working well, a ring beam, a lower-layer tunnel body and an upper-layer tunnel body, wherein the ring beam is formed on the inner wall of the working well, and the lower-layer tunnel body and the upper-layer tunnel body are formed on the lower and upper sides of the ring beam; the reception of the lower-layer tunnel body is completed in a shield, turning and building formation after starting of the steel platform are completed in the working well; in this way, after building of the steel platform is completed, the construction of the lower-layer tunnel body can be restored subsequently, the construction of the upper-layer tunnel body such as starting, tuning and receiving is conducted at the same time, and the difficulty is solved that existing up-and-down overlapped tunnels can not be continuously constructed. By the adoption of the aerial steel platform for achieving the continuous construction of the overlapped tunnel, tunnel-door ring beam and filling concrete pouring and hoisting construction of large equipment on the late stage of tunnel construction are not affected.

Aerial steel platform for achieving continuous construction of overlapped tunnel and construction method thereof

The utility model discloses a shield machine receiving platform which comprises a plurality of stand columns, a plurality of main beams, a plurality of secondary beams and a plurality of top plates; the stand columns have at least three rows and four lines, and a plurality of inclined supports are fixedly arranged between every two transversely-adjoining stand columns and every two lengthways-adjoining stand columns; the tops of each line of the stand columns are all fixedly provided with one main beam; the top of each main beam is fixedly provided with one secondary beam which is opposite to each row of the stand columns; and the top plates are fixedly arranged at the top surfaces of the secondary beams. The shield machine receiving platform is characterized in that after the tunnel construction of an upper tunnel in a top/bottom overlapped tunnel is completed, the shield machine receiving platform is fixedly arranged on a base plate of a station according to a certain quantity, the top plate is taken as a middle plate of the station for carrying the shield machine in the prior art, a tunnel portal can be broken down after the construction of the shield machine is completed, and the shield machine can be received regardless whether the middle plate of the station is constructed, so that the construction efficiency of the tunnel and the use efficiency of the shield machine are greatly improved.

Shield machine receiving platform

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Shield machine receiving platform