A pulsation-free wet spraying machine resolves the issue of pulsing during pumping of a concrete spraying machine. The wet spraying machine includes a frame, a pumping mechanism, a swing mechanism and a hydraulic system, wherein the pumping mechanism includes a hopper, a material chamber, a concrete feeding mechanism, an auxiliary feeding mechanism and a distribution valve, the hopper is disposed above the material chamber, the concrete feeding mechanism and the auxiliary feeding mechanism each include a hydraulic cylinder, a concrete piston and a concrete cylinder, the concrete cylinder of the concrete feeding mechanism and an auxiliary concrete cylinder of the auxiliary feeding mechanism are both connected with the material chamber, a discharge port is disposed on the material chamber, sealing between the distribution valve and the discharge port is provided by a sealing ring, the distribution valve is disposed inside the material chamber, a front friction plate and a rear friction plate are further disposed inside the material chamber, the swing mechanism includes a swing hydraulic cylinder, a mandrel, a swing arm and a swing hydraulic cylinder base, and the mandrel drives the distribution valve to swing. In addition, The pulsation-free wet spraying machine stably feeds a material, has a compact structure, and is wear-resistant.

A pulsation-free wet spraying machine resolves the issue of pulsing during pumping of a concrete spraying machine The wet spraying machine includes a frame, a pumping mechanism, a swing mechanism and a hydraulic system, wherein the pumping mechanism includes a hopper, a material chamber, a concrete feeding mechanism, an auxiliary feeding mechanism and a distribution valve. The hopper of the pumping mechanism is disposed above the material chamber. The distribution valve is disposed inside the material chamber, the concrete feeding mechanism and the auxiliary feeding mechanism both include a hydraulic cylinder, a concrete piston and a concrete cylinder, a discharge pipe is a three-way pipe fixed at a side surface of the material chamber, an auxiliary discharge pipe of the discharge pipe is connected with an auxiliary concrete cylinder, and a through hole is disposed on the auxiliary concrete cylinder. The swing mechanism includes a swing hydraulic cylinder, a swing arm and a swing hydraulic cylinder base, an auxiliary piston rod of the auxiliary feeding mechanism passes through a mandrel to push an auxiliary concrete piston to move inside the auxiliary concrete cylinder. In addition, the pulsation-free wet spraying machine stably feeds a material, has a compact structure, and is wear-resistant.

The frost-resistant assembled initial support structure of the tunnel for supporting a surrounding rock includes a bearing layer, an elastic compressible structure and an inflatable airbag. A gap space is formed between the bearing layer and the surrounding rock, and the inflatable airbag and the elastic compressible structure are provided in the gap space; and the inflatable airbag after being inflated and the elastic compressible structure jointly fill up the gap space. A construction method includes providing the bearing layer in the tunnel, and forming the gap space between the bearing layer and the surrounding rock; providing the inflatable airbag and the elastic compressible structure in the gap space; and inflating the inflatable airbag and filling up the gap space with the inflatable airbag and the elastic compressible structure.

The present invention provides for a compressible grout mix for filling an annular gap between a tunnel rock wall surface and a tunnel liner of a tunnel in a rock formation subject to time dependent deformation after excavation and a method of filling the annular gap between a tunnel rock wall surface and a funnel liner of a tunnel in a rock formation subject to time dependent deformation after excavation utilizing the compressible grout mix for resilient absorption of forces in the hardened state of the compressible grout mix exerted by the time dependent deformation of the rock wall surface into the tunnel opening. The method includes: a. providing a compressible grout mix comprising hydraulic binding agent, bentonite clay, polymer foam particles, water, and one or more additives selected from water-reducing admixture and/or setting retarding admixture, aggregate materials, anti-wash agents and air, b. placing the compressible grout mix in the annular gap between the tunnel wall rock surface and the tunnel liner, and c. allowing the compressible grout mix to set, wherein the compressible grout mix in the hardened state has a compressible ratio greater than the anticipated time dependent deformation.

Disclosed is a mixing and guniting device of a new type for a TBM, wherein the device comprises a concrete inlet pipe (1), a four-way pipe (15), a nozzle (4), an agitator motor (5), a longitudinal swing oil cylinder (6), a flow mixer, a lateral swing oil cylinder (16), a telescopic oil cylinder (7) connected to a big arm, and a controller, one end of the telescopic oil cylinder (7) being provided with a connection plate (12), the four-way pipe (15) being fixed on the upper part of the connecting plate (12), two interfaces in the upper part of the four-way pipe (15) being respectively provided with an air inlet pipe (2) and an accelerator inlet pipe, a measuring sensor connected to the controller being provided in the air inlet pipe (2), two interfaces in the lower part of the four-way pipe (15) being respectively provided with bent pipes (8), the other ends of the bent pipes (8) being in communication with the flow mixer, the nozzle (4) being provided in the upper part of the flow mixer, the concrete inlet pipe (1) being provided in the lower part of the flow mixer, and the concrete inlet pipe (1) being in communication with the nozzle (4) and the bent pipe (8) via the flow mixer. The mixing and guniting device can adjust the distance and the angle between the nozzle and a sprayed face intelligently and in real time according to the air flow, so as to ensure a suitable distance at which the rebound rate is lowest and the best angle at which the nozzle is always perpendicular to the sprayed face, such that the rebound rate is effectively reduced with less loss of concrete, energy conservation and environmental protection.

Disclosed is a mixing and guniting device of a new type for a TBM, wherein the device comprises a concrete inlet pipe (1), a four-way pipe (15), a nozzle (4), an agitator motor (5), a longitudinal swing oil cylinder (6), a flow mixer, a lateral swing oil cylinder (16), a telescopic oil cylinder (7) connected to a big arm, and a controller, one end of the telescopic oil cylinder (7) being provided with a connection plate (12), the four-way pipe (15) being fixed on the upper part of the connecting plate (12), two interfaces in the upper part of the four-way pipe (15) being respectively provided with an air inlet pipe (2) and an accelerator inlet pipe, a measuring sensor connected to the controller being provided in the air inlet pipe (2), two interfaces in the lower part of the four-way pipe (15) being respectively provided with bent pipes (8), the other ends of the bent pipes (8) being in communication with the flow mixer, the nozzle (4) being provided in the upper part of the flow mixer, the concrete inlet pipe (1) being provided in the lower part of the flow mixer, and the concrete inlet pipe (1) being in communication with the nozzle (4) and the bent pipe (8) via the flow mixer. The mixing and guniting device can adjust the distance and the angle between the nozzle and a sprayed face intelligently and in real time according to the air flow, so as to ensure a suitable distance at which the rebound rate is lowest and the best angle at which the nozzle is always perpendicular to the sprayed face, such that the rebound rate is effectively reduced with less loss of concrete, energy conservation and environmental protection.

The present invention provides for a compressible grout mix for filling an annular gap between a tunnel rock wall surface and a tunnel liner of a tunnel in a rock formation subject to time dependent deformation after excavation and a method of filling the annular gap between a tunnel rock wall surface and a funnel liner of a tunnel in a rock formation subject to time dependent deformation after excavation utilizing the compressible grout mix for resilient absorption of forces in the hardened state of the compressible grout mix exerted by the time dependent deformation of the rock wall surface into the tunnel opening. The method includes: a. providing a compressible grout mix comprising hydraulic binding agent, bentonite clay, polymer foam particles, water, and one or more additives selected from water-reducing admixture and/or setting retarding admixture, aggregate materials, anti-wash agents and air, b. placing the compressible grout mix in the annular gap between the tunnel wall rock surface and the tunnel liner, and c. allowing the compressible grout mix to set, wherein the compressible grout mix in the hardened state has a compressible ratio greater than the anticipated time dependent deformation.

The invention relates to a control fitting having a two-way cross-fitting, which has an inlet connecting piece, an outlet connecting piece and a passage connecting piece, and having a control element which is arranged in a guide connecting piece of the control fitting so as to be movable between an open position and a closed position, wherein the outlet connecting piece, in the open position of the control element, communicates with the inlet connecting piece and, in the closed position of the control element, is blocked relative to the inlet connecting piece and the passage connecting piece communicates with the inlet connecting piece both in the open position and in the closed position of the control element, and wherein the guide connecting piece has, on an end remote from the outlet connecting piece, an opening for receiving the control element.

A method for reinforcing a structure comprising the following steps: preparation of UHPFRC comprising a cement precursor mix, of water, a fluidizing agent and metal fibers, transporting the UHPFRC by pumping to a suitable spray nozzle, spraying the mix onto a surface of the structure by the addition of a compressed air stream in the spray nozzle.

The present invention relates to a loaded-to-frame detection equipment for backfill grouting of a shield tunnel, including an automatic loaded-to-frame transmission apparatus, a ground penetrating radar, and an intelligent backfill grouting processing and analysis software. The equipment is integrated by using software and hardware, and can implement real-time visual detection of a backfill grouting layer in a shield construction process. The loaded-to-frame automatic transmission apparatus mainly includes a track, a synchronous belt, a transmission mechanism, a servo machine, and a drive and reducer; and a new air-coupled radar detection apparatus is carried on the loaded-to-frame automatic transmission apparatus and is installed on a shield frame. With the shield performs tunneling, circular detection on a grouting body of the shield and visual layered display of the grouting body are implemented.