A fire resistant tunnel expansion joint system for installation between substrates of a tunnel. The system includes a fire protection barrier applied at a predetermined thickness to the substrates and a fire resistant tunnel expansion joint. The tunnel expansion joint includes a core and a fire retardant infused into the core. The core is configured to define a profile to facilitate the compression of the tunnel expansion joint when installed between the substrates. The fire protection barrier and the fire resistant tunnel expansion joint are each capable of withstanding exposure to a temperature of at least about 540° C. or greater for about five minutes.

Disclosed are a fireproof material, a fireproof plate, a fireproof wall structure for tunnels and a construction method. The fireproof material includes the following components in weight ratio: 20-35 parts of aluminosilicate; 10-25 parts of calcium carbonate; 5-15 parts of magnesium oxide; 5-15 parts of silica; 20-40 parts of a binder; and 5-10 parts of a curing agent, the binder includes at least one of lithium silicate, potassium silicate and sodium silicate in combination with at least one of quartz sand and industrial sugar; and the curing agent is at least one of lithium oxide and magnesium oxide. In the preparation, firstly forming the mixture of aluminosilicate, magnesium oxide and silica into particles at 900° C.-1250° C., and then mixing the particles with calcium carbonate, the binder and the curing agent, and then pouring same into a forming mold and heating and pressing to form the fireproof material.

The present invention disclose a tunnel profile element (10, 20A, 20) comprising a lightweight body constituted by foam glass panels sprayed with unbroken polyurea layer providing a fire resistant coating, and which is providing increased mechanical integrity of the tunnel profile element (10, 20A, 20).

The present invention disclose a tunnel profile element (10, 20A, 20) comprising a lightweight body constituted by foam glass panels sprayed with unbroken polyurea layer providing a fire resistant coating, and which is providing increased mechanical integrity of the tunnel profile element (10, 20A, 20).

The subject of the invention is based on an insulating element, in particular a strip or other insulating element, joined in particular by melting or welding, which is provided on at least one side with a combustible or thermally destructible and electrically conductive element. The invention also relates to a method of inspecting of welds and melting of insulating elements, in particular strips. The invention further provides a control system for welds and melting-down of insulating elements.

Disclosed are methods, compositions, and composition packages for spray-coating a membrane for waterproofing a concrete tunnel applications. After primer coating is applied onto a surface in the tunnel, the coating composition is sprayed to form a membrane, and then concrete is cast or sprayed against the membrane so that it can bond to the membrane. Coating compositions comprise two or more acrylate monomers, as well as initiator, accelerator, and optional additive. Preferably, the coating composition is established by using a two-part package, one part having initiator, the other part having accelerator, and each part containing the monomers and optional additives so that the two parts can be shipped to the application site and mixed in a 1:1 ratio during spraying. The waterproofing coating composition provides excellent bonding with concrete.

Disclosed are methods, compositions, and composition packages for spray-coating a membrane for waterproofing a concrete tunnel applications. After primer coating is applied onto a surface in the tunnel, the coating composition is sprayed to form a membrane, and then concrete is cast or sprayed against the membrane so that it can bond to the membrane. Coating compositions comprise two or more acrylate monomers, as well as initiator, accelerator, and optional additive. Preferably, the coating composition is established by using a two-part package, one part having initiator, the other part having accelerator, and each part containing the monomers and optional additives so that the two parts can be shipped to the application site and mixed in a 1:1 ratio during spraying. The waterproofing coating composition provides excellent bonding with concrete.

A shield method includes the steps: providing a first cylindrical frame 31 at a position where an entrance 12 is to be formed in an inner surface of an earth retaining wall 11 of a shaft 1; excavating a horizontal hole 5 in the underground by a shield machine 2, and sequentially adding and building, in the excavation direction, a plurality of segments 4 on an inner diameter side of the horizontal hole 5 while forming the entrance 12 in the shaft 1; temporarily stopping water from a gap between the entrance 12 and the shield machine 2, and removing excavated soil and pieces 6 that enter the first cylindrical frame 31 as the entrance 12 is formed; and coupling a second cylindrical frame 32 having a sealing member 35 attached thereto to an inner open end of the first cylindrical frame 31.

The invention relates to a tunnel lining composed of at least two concrete elements (10) each having at least one protective element (20) connected to the concrete element, wherein the protective element (20) has a protective portion which has a first side which faces the concrete element (10) and on which there is provided at least one connecting element (17) for producing a retaining connection between the protective portion and the concrete element (10), wherein the protective portion consists of at least one plastic, wherein the protective element (20) has at least one protective element seal (30) which is connected to the protective portion (20), wherein the connection to the protective portion (20) is gas-tight and liquid-tight, wherein a joint (40) is present between the at least two concrete elements (10) arranged to form the tunnel lining (300), wherein the joint (40) is sealed in a gas-tight and liquid-tight manner with respect to the tunnel interior (100) by at least one protective element seal (30) having a sealing action (first sealing action), and wherein the tunnel lining (300) is provided with drainage (C) into the tunnel interior (100).

A preparation method of an expansive polymer grouting material for treating high-pressure large-flow-rate karst water inrush includes: 1) adding a crosslinking agent to acrylic acid; then adding a polymer water-absorbent resin comonomer and performing a polymerization reaction to obtain a precursor; 2) adding an initiator to the precursor obtained in step 1), heating the mixture, performing a reaction to obtain a hydrogel, and grinding the hydrogel to obtain a primary polymer water-absorbent resin; 3) spraying a surface crosslinking agent onto a surface of the primary polymer water-absorbent resin obtained in step 2), and drying the product; and 4) preparing a suspension from an inorganic water conducting agent, spraying the suspension onto the product obtained in step 3), and performing drying to obtain the expansive polymer grouting material.