The invention discloses a low-rebound rate and low-dust concrete nozzle device in anchor spray shoring engineering and relates to the technical field of the anchor spray shoring engineering. The effects of reducing the rebound rate and reducing dust can be achieved. The concrete nozzle device consists of a pulp-feeding pipe, a stirring and mixing pipe, a stabilizing pipe and a spray nozzle, wherein the pulp-feeding pipe is connected with the stirring and mixing pipe; the stirring and mixing pipe is designed to be divided into two parts; one part is a rotating surface with the inclination angle of 45 degrees; the other part is a stirring rod; a steel sleeve area is arranged in the place between the stirring and mixing pipe and an outer sleeve; a valve is arranged at the spray nozzle and consists of a valve head and a valve plate; the valve plate is arc.

Low-rebound rate and low-dust concrete nozzle device in anchor spray shoring engineering

The invention provides a pipe-jacking tunnel section optimization method. The pipe-jacking tunnel section optimization method comprises the following steps: firstly, pre-tunnelling is performed to enable an excavated tunnel to naturally deform, and the actual crown settlement value of a soil layer is monitored and taken as reference for follow-up judgment; crown settlement in the section shape which is the same as the excavated tunnel is calculated according to given parameters of the soil layer, the calculated value and the actual measurement value are compared, the given parameters of the soil layer conforms to the reality if the calculated value and the actual measurement value are consistent, and on the basis, inversion calculation of the overexcavation range is performed; different overexcavation section shapes are designed, crown settlements corresponding to the different overexcavation section shapes are searched repeatedly till the situation that the soil layer subjected to crown settlement is exactly right in contact with the top of a pipe-jacking pipeline without an additional clamping force, and the corresponding section subjected to overexcavation is taken as the optimal section; and crown settlements are continually monitored, the parameters of the soil layer are continually modified, and the appropriate overexcavation section shape is continually selected in the tunnelling process to ensure favorable gaps on the left and right and above pipe jacking to remove the up-and-down clamping function of the soil layer.

Pipe-jacking tunnel section optimization method

The invention belongs to the technical field of urban tunnel underground excavation construction, and particularly relates to a shallow-buried collapsible loess tunnel core soil and glass fiber anchorrod reinforcing construction method. Advanced core soil is reinforced by utilizing glass fiber grouted anchor rods, the compressive and shearing resistance ability of the advanced core soil is improved, extruding deformation of a soil body in front of a tunnel face is restricted, a reinforcing area formed by the glass fiber grouted anchor rods and advanced grouting small guiding pipes has the function of water resistance, the consolidation settlement speed of upper collapsible loess is slowed down, meanwhile, the glass fiber grouted anchor rods are easy to cut, and tunnel tunneling excavationis not affected. The core soil is reserved to exert reverse thrust to restrict strain release of stress of the front soil body, in addition, the advanced grouting small guiding pipes can form a supporting arch ring on the upper part, and collapse of soil blocks is reduced.

Shallow-buried collapsible loess tunnel core soil and glass fiber anchor rod reinforcing construction method

The invention provides a novel anchor rod with high-strength steel wires and a grouting pipe in surrounded matching and a high shear resistant capacity, and belongs to the field of anchoring engineering. The anchor rod is a supporting and protecting device and mainly used for geology which has complicated geological conditions and is easy to enable the anchor rod to laterally deform. The anchor rod disclosed by the invention consists of the grouting pipe, a conical anchor head, an expansion pipe, a bowl-shaped tray, a nut and the high-strength steel wires, wherein the conical anchor head is arranged at the head of the anchor rod, the anchor rod is fixed to the high-strength steel wires together, and the high-strength steel wires closely and orderly surround the grouting pipe so as to be matched with the expansion pipe and the grouting pipe, so that the shear resistant capacity of the grouting pipe is ensured.

Novel anchor rod with high-strength steel wire and grouting pipe in surrounded matching and high shear resistant capacity

The invention discloses a tunnel uneven settlement-based train derailment accident scenario construction method. The method comprises the following steps of: S1) establishing a basic model of subway tunnel uneven settlement according to variables causing tunnel foundation uneven settlement; S2) acquiring an uneven settlement volume and inclined deformation data of a tunnel foundation, and carrying out concentrated analysis on the acquired data information by combining current conditions of a subway tunnel, so as to obtain a rail deformation or settlement volume; S3) amplifying the rail deformation or settlement volume, and acting the amplified rail deformation or settlement volume on a high-speed subway train to obtain a train instability and derailment model; and S4) virtualizing above accident scenario and carrying out animation display. According to the method, an emergency preparation strategy is provided for the safe operation services after the opening of subways in cities, so that the train derailment accidents caused by the tunnel uneven settlement can be previously displayed and then convenience is brought to intensify the rescue preparation.

Tunnel uneven settlement-based train derailment accident scenario construction method

The invention relates to the underground engineering loess tunnel safety construction field, and especially relates to the underground engineering loess tunnel ground surface settlement control construction process with strong pertinency and simple technology; settlement deformation monitor measurements are taken so as to realize dynamic monitor measurements in tunnel excavation construction, thus providing reliable data guarantee for safety construction; measurements like advanced support, steel arch centering support and timely concrete injection are taken so as to ensure tunnel surrounding rock composition stabilization; lime soil compaction piles are used for reinforcing the loess layer, and 37 lime soil is refilled, thus greatly improving construction security and composition stability; in construction, quicklime is used for chemical modification, thus optimizing loess property, improving loess intensity, and ensuring tunnel stabilization and safety.

Underground engineering loess tunnel ground surface settlement control construction process

The utility model provides an antiskid anchor rod with multiple stages of elastic pieces. The antiskid anchor rod is composed of a conical closed cap (1), a steel pipe (11), the elastic pieces (2), a stop-grouting plug (6), a tray (7) and a nut (8). The antiskid anchor rod is characterized in that the conical closed cap (1) is arranged on the head portion of the steel pipe and externally provided with threads, grouting holes (3) are formed in the steel pipe (11), hook holes (10) are formed in the steel pipe (11) and located between the grouting holes (3), and elastic hooks (5) on the elastic pieces (2) extend into the hook holes (10) so that the elastic pieces (2) can be firmly connected with the steel pipe (11); the elastic pieces (2) are provided with extrusion deformation joints (9) and grouting holes (3). The antiskid anchor rod with the multiple stages of elastic pieces can effectively solve the problem that an anchor rod slips off in sludge, drift sand and other unfavorable geologic bodies.

Antiskid anchor rod with multiple stages of elastic pieces

The utility model relates to a high-strength steel wire surrounding matching shear-resisting anchor rod, and belongs to the field of anchor engineering. The high-strength steel wire surrounding matching shear-resisting anchor rod is a shoring device and is mainly applied to geologies where conditions are complex, and transverse deformation of the anchor rod is easily caused. The high-strength steel wire surrounding matching shear-resisting anchor rod is composed of a slip casting pipe, a taper anchor head, an expansion pipe, a bowl-shaped tray, a nut and a high-strength steel wire; the taper anchor head is arranged at the head of a rod body, a slip casting hole is formed to be connected with the slip casting pipe, the slip casting pipe is surrounded by the high-strength steel wire, the rod body is sleeved with the expansion pipe with the diameter smaller than the diameter of the taper anchor head, an extrusion deformation joint is formed in the bottom end of the expansion pipe, and the bowl-shaped tray is a bowl-shaped disc arranged on a bowl-shaped disc body in a plugging mode. According to the high-strength steel wire surrounding matching shear-resisting anchor rod, the head is provided with the taper anchor head; in addition, the high-strength steel wire surrounding matching shear-resisting anchor rod and the high-strength steel wire are fixed together, the slip casting pipe is surrounded by the high-strength steel wire tightly and orderly, and the shear-resisting capacity of the slip casting pipe is guaranteed.

High-strength steel wire surrounding matching shear-resisting anchor rod

The utility model discloses a concrete spraying head device for supporting engineering. The concrete spraying head device for supporting engineering is composed of a grout inlet pipe, a stirring and mixing pipe, a stabilizing pipe and a nozzle, wherein the grout inlet pipe is connected with the stirring and mixing pipe, the stirring and mixing pipe is designed to be composed of two parts, one part of the stirring and mixing pipe is a rotary surface which inclines by 45 degrees, the other part of the stirring and mixing pipe is a stirring bar, a built-in steel sleeve area is arranged between the stirring and mixing pipe and an outer sleeve, a valve is arranged at the position of the nozzle and is composed of a valve head and a valve piece, and the valve piece is in an arc shape.

Concrete spraying head device for supporting engineering

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