SU1249162A1 - Method of constructing an underground structure - Google Patents

Description

The invention relates to the construction of underground structures by a closed method and can be used in the construction of underground extensive vaults, tunnels, collectors and pipelines.

The purpose of the invention is to increase the penetration rate and the effectiveness of controlling the direction of movement of the shield.

Fig, I shows the structure at the initial moment of its construction with a longitudinal section; Fig 2 is the same during the erection process; on fig.Z - section aa in figure 1.

For the implementation of the method, it uses the equipment, the forward part of which includes a rigid frontal shield with a knife device 2, radial partitions dividing the working space of the slab into several, but not less than three, sector working chambers 3, nozzle 4 and intake (receiving) devices 5 , the front wall of an airtight sliding formwork 6 with channels 7 attached to it to form channels in the body of the concrete for laying flexible traces of controlling the direction of movement of the shield and increasing the degree of compaction concrete mix, the inner wall of the formwork 8, in which a collector 9 is mounted for depositing the inner surface of the lining of the composition, reducing the coefficient of friction of concrete against the formwork and sealing the inner surface of the lining, an airtight shield-diaphragm 10 with a spacer pneumatic cover 11 for locking and creating in the front part of the hermetic cavity, the packing device 12 for passing the pipes of the slurry pipeline, water supply system and the concrete pipeline, the compressor 13 and the air duct 14, In addition, the excavation pit 15 is marked, Orn wall 16 with an aperture 17, the shell 18, ground 19, a water pump 20, a concrete pump 21, conduits 22 and 23, the slurry pipeline 24, .otvodnye blocks 25, flexible control gi.26 m and drums 27,

The construction of the structure is carried out as follows.

Prior to the start of the main works by any known methods, the excavation pit 15 is dug to the depth to the lower oTT-ieT structure. In the end part of the pit, the working chamber was erected with

the stop wall 16, in which the opening 17 is arranged, in area and configuration corresponding to the cross section of the structure. In the trench, the movable part of the equipment is mounted (shield, formwork) so that the central part of the formwork comes in contact with the retaining wall 16, the open part of the formwork is covered with temporary, necessary MER in a very early period of penetration of the inventory casing 18 and sprinkled the front part of the shield with the ground 19 Aperture 17 installs a shield-diaphragm 10, and a water pump 20 and

concrete pump 21 with flexible, for example polyethylene, pipelines 22 and 23, connecting nozzle devices 4 and the internal cavity of the formwork

0 6. From the intake (receiving) devices 5 to the place of deposition of the soil, the slurry pipe 24 is conducted. Through the channels 7 and by-pass units 25, flexible rods are passed.

5 shield I, and wind them on the drums 27 with brake devices.

At this preparatory stage, the construction of the structure is considered completed,

0 After checking the operability of all components and assemblies of the equipment, they start to perform basic work. By supplying pressurized water to the nozzle devices 4, the soil is washed away and, through the receiving devices 5, transports it to the deposition site via the pulp line 24. At the same time in the formwork 8 between its shields and temporary shell 18 through the pipeline

Q 23 injects the concrete mixture, and in a closed space bounded by formwork pitites and a sealed diaphragm 10 installed in the opening of the thrust wall 16, a compressor 13

 through the duct 14 serves compressed air. At the same time, the diaphragm 10 is held due to the frictional forces of the pneumatic balloon 11 against the walls of the opening in the supporting wall 16. The air pressure in the pneumatic balloon is created so that these forces are sufficient to keep the daofragm in the opening. After filling the formwork with a concrete mixture and reaching the design pressure of the mixture created by the concrete with certain tension forces and controlling the direction of movement of the shield, the center moves forward more and more into the ground.

five

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five

The lack of strength of concrete in the early stages of its hardening is compensated by the air pressure in the structure.

The length of penetration, without changing the sealing shield of the orifice plate, is determined by the penetration length, the strength of the concrete of the lining of which can itself 5 without creating backpressure of the air, to absorb external loads on the trim. The length of the entire penetration without rearrangement of the process equipment (concrete pump, water pump, compressor, etc.) is determined by the technical possibilities of this equipment. With the length of the structure that has reached these values, new equipment stands, new places for the deposition of soil and

49162

upholding water. The length of the entire structure erected by the proposed method and equipment is unlimited. The design direction of the movement of the shield (straight-line or curvilinear, if necessary) is provided by changing the values of the braking forces of the drums from which the flexible control ropes are wound, while simultaneously disconnecting the hydraulic scouring system in one or two sectors of the working space.

After completion of work on the

15, the equipment is dismantled, and in channels formed in the body of concrete. Finishes, if necessary, rods or bundles of reinforcement are laid and tensioned, and then channels 2Q are injected with mortar.

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J 2 91725

FIG. 2

Editor I.Nikolaychuk

Order 4211/32 Circulation 470 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, F-ZZ-, Raushsk nab. 4/5

Production and printing company, Uzhgorod, Projecto st., 4

FI.3

Compiled by V. Cherkashenin

Tehred M. Hodani; Proofreader A. Obruchar

Claims (1)

METHOD FOR CONSTRUCTING UNDERGROUND CONSTRUCTION, including hydromechanized excavation in the face, divided into sector chambers, moving the shield, erecting the lining by pumping 'concrete mixture into a closed formwork space, characterized in that, in order to increase the speed of penetration and the effectiveness of controlling the direction of movement of the shield, hydromechanized soil development is carried out in sector chambers, while at the same time the concrete mixture is pumped into a closed formwork space and compressed air is fed into closed space limited by a sealed diaphragm and shield. Figure 1 (L N3 C © cx to