891 results about "Shotcrete" patented technology

The invention provides a sprayed concrete hardening detection method and system, and relates to the technical field of material detection.The sprayed concrete hardening detection method comprises the steps that detection requirements are determined based on physical characteristics of sprayed concrete, and a progressive multi-frequency excitation sequence is established; after each time of multi-frequency excitation is completed, echo signals in the concrete are monitored in real time, and excitation parameters are dynamically adjusted according to the quality of the echo signals; the collected echo signals are preprocessed; performing multi-dimensional characteristic parameter extraction on the preprocessed echo signals, including time domain characteristics, frequency domain characteristics and energy domain characteristics, to form representative characteristic vectors; removing redundant features according to the feature vector, and calculating a hardening score by using residual features; and outputting a detection result and early warning information according to the hardening score. According to the method, the hardening state of the sprayed concrete can be accurately evaluated, so that reliable technical support is provided for engineering construction quality control.

The invention discloses a portal type integrated operation workstation capable of adapting to different underground cavern sections. The portal type integrated operation workstation comprises a frame supporting system, an intelligent control room, a moving walking system, an electrical system and a functional arm system. The frame supporting system comprises first longitudinal beams which are arranged in a left-right spaced mode, and a plurality of transverse telescopic joints are installed between the left first longitudinal beam and the right first longitudinal beam. A plurality of longitudinal shrinkage joints are mounted at the lower end of each first longitudinal beam, the lower ends of the longitudinal shrinkage joints are connected with a high-strength supporting frame, and a movable walking system is mounted at the bottom of the high-strength supporting frame; the functional arm system comprises a concrete spraying-arch mounting arm, an anchor rod mounting arm and a drilling arm which are arranged in a layered mode from top to bottom. According to the portal type integrated operation workstation capable of adapting to different underground cavern sections, the functions of drilling, anchor rod construction, grouting, net hanging, arch frame installation, spraying and mixing and the like are integrated, and meanwhile the size of equipment can be freely adjusted so that the portal type integrated operation workstation can adapt to the extra-large sections of different sizes.

The invention relates to the technical field of concrete construction, and discloses a method for reducing the concrete spraying rebound rate and a concrete wet spraying device.The method comprises the following steps that a fluid control model based on historical guniting data is established, the model is used for performing parameter matching on the concrete guniting volume and the spraying speed, the spraying pressure and the spraying temperature of the high-speed fluid; the real-time guniting volume of the concrete wet spraying equipment is collected; and according to the guniting volume and the control model, generating fluid jet control parameters matched with the guniting volume and the control model. And through an accurate fluid control model and a real-time feedback mechanism, the concrete spraying rebound rate is effectively reduced. And an automatic spraying parameter adjusting mechanism is adopted, so that the pressure, the angle and the spraying amount of the sprayed fluid are accurately adjusted according to real-time monitoring data, and the construction efficiency and the spraying consistency are improved. And through a high-precision rebound rate monitoring system, rebound data are automatically calculated and fed back, the spraying process is optimized, concrete waste is reduced, and the resource utilization rate is increased.

The invention discloses early-strength, low-resilience and high-durability sprayed concrete and a preparation method thereof. The sprayed concrete is prepared from the following components: cement, an early-strength hardening auxiliary cementing material, coarse aggregate, fine aggregate, water, an additive, a fluoride-free alkali-free high-concentration accelerator, a rheology modifier, fibers and the like. The preparation method of the sprayed concrete mainly comprises two aspects. The method comprises the following steps: (1) proportioning optimization; and (2) functional materials are applied. By optimizing the glue material amount, the water-glue ratio and the sand ratio and adopting the small-particle-size coarse aggregate, the concrete has good workability and homogeneity, the risk of pipe blocking in the pumping and spraying process is reduced, aggregate rebound in the jet flow process is reduced, and the spraying operation effect is optimized. By applying the high-concentration fluoride-free alkali-free accelerator and the early-strength hardening auxiliary cementing material, the early strength of the concrete can be effectively improved, the volume deformation is reduced, and the long-term mechanical property and durability are improved. The fiber and the rheological modifier are added, so that the rheological property of the sprayed concrete can be further effectively improved, and the rebound rate is reduced. Rapid setting of the sprayed concrete and cooperative improvement of mechanical properties and long-term performance are achieved by optimizing the mixing ratio and applying novel functional materials.

The invention discloses a low-shrinkage high-toughness sprayed concrete material as well as a preparation method and application thereof, and the low-shrinkage high-toughness sprayed concrete material is prepared from the following materials in parts by mass: 400 to 440 parts of cement, 50 to 70 parts of coal ash, 20 to 40 parts of silica fume, 170 to 190 parts of water, 850 to 880 parts of fine aggregate, 770 to 810 parts of coarse aggregate, 30 to 50 parts of accelerator and 3.2 to 6.0 parts of water reducing agent. Hybrid fibers: 30 to 50 parts of steel fibers and 0.9 to 2.7 parts of organic fibers. The low-shrinkage high-toughness sprayed concrete material provided by the invention can ensure high compressive strength and toughness, also has good durability and stability, effectively improves the construction quality of tunnel engineering, and has very excellent market prospects.

The invention relates to the technical field of hydraulically-driven industrial control, and particularly discloses a self-adaptive control method and system for a hydraulically-driven guniting manipulator, which are characterized in that a pressure fluctuation signal, a flow change signal and a mechanical arm displacement signal of a hydraulic system are collected in real time, and a frequency domain decomposition processing technology is combined to realize self-adaptive control of the hydraulically-driven guniting manipulator. Separating the composite signal into a low-frequency characteristic signal reflecting load change and a high-frequency characteristic signal reflecting pressure impact; for a low-frequency signal, a dynamic weight adjustment strategy is adopted to generate a load compensation control quantity; for high-frequency signals, pressure oscillation is suppressed through differential order adjustable phase compensation processing; and finally, inputting the two paths of control characteristic values into a driving control model of the guniting manipulator, and generating an adjusting instruction of the hydraulic actuating mechanism.

The invention discloses wet shotcrete for tunnel engineering as well as preparation and application methods thereof, and belongs to the technical field of wet shotcrete. The wet spraying concrete for tunnel engineering is characterized by being prepared from the following components in parts by weight: 410 to 440 parts of cement, 850 to 980 parts of medium sand, 780 to 860 parts of coarse aggregate, 195 to 215 parts of water, 35 to 45 parts of coated modified porous aggregate, 9 to 13 parts of water reducing agent and 12 to 25 parts of accelerator. The porous aggregate is subjected to coating modification treatment, so that in the preparation and production process of the wet-sprayed concrete for tunnel engineering, the state of the concrete is not influenced, but in the concrete spraying process, due to the fact that the porous aggregate subjected to coating modification and a film coated by the porous aggregate are damaged under the action of pumping and pumping pressure, the wet-sprayed concrete for tunnel engineering is not influenced. The porous aggregate is exposed, and the porous aggregate can adsorb free water in the concrete due to the characteristics of porosity and extremely easy water absorption of the porous aggregate, so that the concrete becomes viscous during spraying, and the rebound rate of the concrete is reduced.

The invention particularly discloses a time-space design method for a railway tunnel active support rock anchoring and shotcreting synergistic effect considering a time-space effect, and relates to the technical field of civil engineering. The method comprises the steps that firstly, expression characteristics of the load time effect, the material time effect, the tunnel face space effect and the rock anchor bearing arch space effect of active supporting are determined, a space-time effect characterization method is established, and then a tunnel active supporting rock anchor and shotcrete synergistic effect space-time calculation model is constructed; then determining calculation parameters of a rock anchor bearing arch and a sprayed concrete layer, and constructing a surrounding rock pressure calculation method and a safety evaluation method considering the advance support effect; and finally, according to a calculation result of the tunnel active support rock anchoring and shotcreting synergistic effect space-time calculation model, safety is judged, and design parameters of a pre-stressed anchor rod and shotcreting concrete are determined. The method can simply, quickly and accurately calculate the internal force distribution and safety of the tunnel rock anchor bearing arch and the sprayed concrete layer under different time, geological conditions and support design parameters, and has good engineering value.

The invention relates to the technical field of concrete materials, and discloses rapidly-reinforced high-performance sprayed concrete for an existing tunnel lining and a preparation method of the rapidly-reinforced high-performance sprayed concrete. The sprayed concrete is prepared from the following raw materials in parts by weight: 300 to 350 parts of low-calcium high belite sulphoaluminate cement, 80 to 100 parts of superfine slag powder, 3 to 8 parts of a trigger type activating agent, 5 to 15 parts of slow-release particles, 2 to 5 parts of nanogel, 800 to 900 parts of fine aggregate, 800 to 900 parts of coarse aggregate, 30 to 50 parts of copper-plated steel fiber, 0.8 to 1.2 parts of polypropylene fiber, 30 to 40 parts of a viscosity-adjusting accelerator, 10 to 20 parts of a water reducing agent and 160 to 180 parts of water. The sprayed concrete is high in compressive strength and good in durability, the double threats of chemical corrosion and chloride ion permeation / steel bar corrosion are cooperatively solved, and the requirement for rapid reinforcement of tunnels and underground engineering is met.

The invention relates to the technical field of concrete preparation, in particular to a modified imitation steel fiber toughened sprayed concrete material and a preparation process thereof.The modified imitation steel fiber toughened sprayed concrete material is prepared from, by weight, 400-420 kg / m < 3 > of cement, 175-190 kg / m < 3 > of water, 820-840 kg / m < 3 > of coarse aggregate, 890-910 kg / m < 3 > of fine aggregate, 32-40 kg / m < 3 > of silicon powder, 6.5-7 kg / m < 3 > of water reducing agent, 25-30 kg / m < 3 > of accelerator and 3-5 kg / m < 3 > of modified imitation steel fiber; the modified imitated steel fiber is formed by mixing sulfonated polypropylene imitated steel fiber and carboxylated polypropylene imitated steel fiber according to the mass ratio of 1: (1.2-1.8). The modified steel-imitating fiber is prepared by sulfonating and carboxylating the polypropylene steel-imitating fiber and reasonably compounding, and is applied to a sprayed concrete material, so that the adhesive property of the sprayed concrete can be obviously improved, the rebound rate of the sprayed concrete can be obviously reduced, and the mechanical property of the sprayed concrete can be effectively improved.

The invention discloses solid waste-based fiber reinforced sprayed concrete and a preparation method thereof, and belongs to the technical field of concrete. The sprayed concrete is prepared from the solid waste-based cementing material, the fine aggregate, the basalt fiber, the water reducing agent, the accelerator and the water, the slag, the carbide slag, the fly ash and the cement serve as the solid waste-based cementing material, part of the cement is replaced by the fly ash and the slag, the slag can make up for the deficiency of the activity of the fly ash in the early stage, the early strength is rapidly improved, and the early strength is improved. The rebound rate is reduced; the fly ash further densifies the matrix in the later period by means of continuous pozzolanic reaction, so that the durability is enhanced; the basalt fibers, the accelerator and the water reducing agent are mixed, the hydration process is optimized, and the synergistic enhancement effect of the fibers and a matrix is achieved, so that the generation of early cracks and the development of later cracks are inhibited, and finally the sprayed concrete with high strength, high toughness and low shrinkage is obtained.

The invention belongs to the technical field of tunnel supporting, and discloses a supporting structure of a long-distance deeply-buried TBM inclined shaft water-rich complex rock stratum and a working method.The supporting structure comprises graded yielding control anchor rods, anchor cables, a steel bar row, a steel bar net and a sprayed concrete layer, and the steel bar row, the steel bar net and the sprayed concrete layer are sequentially arranged on the tunnel surrounding rock surface from outside to inside; the graded yielding control anchor rod comprises a rod body, an outer ring, a yielding sleeve and an inner ring. In an initial state, the rear end of the rod body presses the inner ring on the rear port of the inner cavity of the yielding sleeve through a nut; the front end of the yielding sleeve extends into the drill hole and tightly presses the outer ring on the surrounding rock on the outer side of the drill hole; primary yielding friction fit is formed between the inner ring and an inner cavity of the yielding sleeve; and the front end of the yielding sleeve is in secondary yielding friction fit with the outer ring. The method has the advantages that the bearing capacity of the surrounding rock is fully exerted, and passive support is converted into active support; the graded yielding control anchor rods and the anchor cables are jointly supported, and the supporting structure is good in integrity and high in strength.

The invention discloses a primary support early-age sprayed concrete safety assessment method under cyclic blasting load, and relates to the field of concrete reliability analysis, and the method comprises the following steps: determining geometric parameters of a to-be-protected tunnel, and establishing a tunnel finite element model; determining a blasting load by using a detonation wave theory, and applying the load to the model for finite element analysis to obtain residual deformation data of each extraction point; determining a blasting load influence range; monitoring the environment temperature time sequence data of the evaluation sub-section, and representing the hydration degree and the water content of the evaluation sub-section; according to the method, the mapping relation between the mechanical characteristic parameters and the hydration degree and the water content is established, the mechanical characteristic parameters of the concrete are calculated, the safety of the sprayed concrete is determined by comparing damage with a safety difference standard, and the scientificity of safety evaluation of the sprayed concrete is improved.

The present invention discloses a high-performance shotcrete and a preparation method thereof, belonging to the technical field of shotcrete. The concrete comprises the following components by weight: 430-450 parts of cement, 800-850 parts of coarse aggregate, 850-900 parts of fine aggregate, 170-180 parts of water, 4-5 parts of a water reducer, 34-41 parts of an early-strength accelerator, 4-8 parts of a solidifying and durable component, and 1.0-1.4 parts of polypropylene fiber. A corresponding preparation method is also provided. The present invention achieves high performance shotcrete by selecting an early-strength accelerator and a solidifying and durable component and optimizing the preparation method. This can effectively reduce rebound, promote rapid development of early strength, and fully guarantee the long-term durability of shotcrete. Its application in tunnel engineering can significantly improve the performance of shotcrete, thereby improving the quality of the engineering structure and fully guaranteeing the service safety of tunnel engineering, thus having broad prospects.

The invention discloses an alkali-free accelerator and a preparation method and application thereof in the technical field of concrete additives, and the alkali-free accelerator provided by the invention comprises the following components in percentage by mass: 40%-50% of aluminum sulfate, 10%-15% of magnesium sulfate, 0.2%-0.6% of diethanol amine, 0.5%-1% of catechol-4-ammonium sulfonate, 5%-10% of a stabilizer and the balance of water. The stabilizer comprises silicate dispersion liquid and silica sol. The alkali-free accelerator provided by the invention can be used for spraying concrete, the mixing amount of the alkali-free accelerator is generally 4-6% of the mass of cement, the alkali-free accelerator is good in rapid setting effect and has excellent early and later compressive strength, and meanwhile, the alkali-free accelerator has relatively excellent stability.

The invention discloses a construction method for prefabricating and assembling a seabed energy storage tank through prestress, and belongs to the technical field of structural engineering. The energy storage tank comprises a plurality of sub-spherical shell units and prestressed reinforcements. The construction method comprises factory prefabrication and field assembly processes of the plurality of sub-spherical shell units. The sub spherical shell units are made of common concrete or ultra-high performance concrete or ultra-high toughness concrete, PVC or metal corrugated pipes used for allowing prestressed steel bars to penetrate through are pre-buried in the shell framework, and anchorage device positioning grooves are reserved in the edges of the shell framework. A plurality of sub spherical shell units are sequentially spliced on site, high-strength prestressed steel bars are arranged in a pipeline in a penetrating mode and are tensioned in a segmented mode, anchorage devices are installed at the ends of the steel bars for fixing, and an overall spherical structure is formed. And sprayed concrete materials are applied to the joints and the positioning grooves for sealing, so that a closed energy storage spherical tank structure is formed. The method is suitable for an energy storage system in a deep sea high-pressure environment, and has the characteristics of simple and convenient construction process and good structural integrity and water tightness.

The invention discloses a soft rock waterproof layer construction method for a soft rock large-deformation section tunnel, and relates to the technical field of soft rock waterproof layer construction of the soft rock large-deformation section tunnel. The construction method of the soft rock waterproof layer for the tunnel at the large deformation section of the soft rock comprises the steps that a sprayed concrete layer is constructed, a full-ring-shaped steel arch frame is erected, system anchor rods are constructed, concrete is sprayed again after full-length grouting is conducted, and a primary supporting layer containing a grouting reinforcing ring is formed; locking anchor pipe grouting is carried out on the arch springing part to form a local reinforced waterproof bearing body; based on deformation monitoring data, dynamic judgment is carried out, and radial reinforcing grouting is carried out on the obvious deformation part; and after deformation is stable, a waterproof layer is laid, a secondary lining is poured, and a composite waterproof system is formed. The waterproof reliability and the structural durability of the soft rock waterproof layer of the tunnel at the large deformation section of the soft rock can be improved.

The invention relates to the technical field of preparation of new materials for coal mine tunnel construction, in particular to a mining ultrahigh-strength sprayed concrete active admixture and a preparation method of the mining ultrahigh-strength sprayed concrete active admixture. The prepared UHPC has excellent jet constructability, rapid hardening performance and long-term durability, realizes nearby high-valued utilization of coal mine solid waste, solves the problems of low strength, high rebound rate and long maintenance period of a traditional roadway spraying material, can replace traditional guniting concrete to be used for rapid support construction and repair of a coal mine roadway, and has a wide application prospect. And the method has remarkable technical economic benefits and social benefits.

The invention discloses an automatic spraying method for a tunnel roadway concrete support in the technical field of concrete support spraying, which comprises the following steps of: controlling a traveling chassis, a pumping mechanism, an arm support mechanism and an environment scanning mechanism through a traveling computer to realize automatic spraying of the concrete support of an excavation surface in a tunnel; a worker does not need to enter a tunnel to control the concrete wet spraying machine in a close range, threats of the severe environment to the health of the worker and potential safety hazards are thoroughly avoided, various parameters during concrete support spraying are adjusted according to the actual situation of an excavation face, and therefore the spraying process of concrete support is accurately controlled, and the construction efficiency is improved. The forming quality of the final concrete support is improved, reworking caused by manual errors is reduced, meanwhile, continuous operation without intermittency can be achieved, and the construction efficiency is improved.

This invention discloses a heat-insulating and heat-resistant shotcrete and its preparation method. This heat-insulating and heat-resistant shotcrete is composed of cement, modified silica mortar, modified heat-insulating ceramsite, fine aggregate, water, admixtures, and accelerators. In this invention, high-strength shale ceramsite with surface modification using hydrogel is introduced as a heat-insulating filler, significantly improving the dispersion and stability of lightweight aggregate in the mortar. It also possesses strong water absorption and slow-release capabilities and surface sealing functions, enabling it to provide pore insulation and internal curing through water storage and release in high-temperature environments. The addition of modified silica mortar, which effectively improves the high-temperature stability and density of the mortar hydration products, comprehensively enhances the homogeneity of the shotcrete mixture, the heat insulation performance of the hardened body, and the strength development and durability under high-temperature conditions. This effectively improves tunnel chamber temperature and extends the service life of the shotcrete under high-temperature conditions. The heat-insulating and heat-resistant shotcrete technology has a clear working mechanism, simple production process, and excellent performance. It is suitable for large-scale production and is of great significance for the high-quality construction of underground projects such as tunnels and mines in high-temperature and high-temperature water inrush environments.

The invention discloses a full-space active and passive reinforced supporting method for a deep roadway, and relates to the technical field of deep roadway supporting. The method comprises the following steps: S1, obtaining a roadway surrounding rock structure, ground stress and surrounding rock physical and mechanical parameters; s2, determining the ranges of a broken area, a plastic area and an elastic area of the surrounding rock of the deep roadway; s3, variable-diameter pressure relief drill holes are constructed to reduce the surrounding rock stress; s4, an anchor net is supported, and concrete is sprayed to block the surface of the surrounding rock; s5, grouting reinforcement is conducted, and anchor rod cables are installed; s6, a full-space concrete filled steel tube support is erected; and S7, a roadway bottom plate is poured, and concrete spraying is conducted on the surface of the surrounding rock so that the support can be embedded. According to the surrounding rock control method, active bearing of the roadway surrounding rock and passive supporting of the full-space support can be effectively coordinated, the cooperative bearing capacity of the deep roadway can be improved, and safety and stability of the deep roadway are guaranteed.

The invention provides an anchor-plate-injection collaborative supporting method for active water sealing. The anchor-plate-injection collaborative supporting method is applied to various laneways penetrating through water-containing stratums, especially to construction of vertical shafts constructed through a freezing method. During freezing method construction, a freezing wall is formed firstly, a section height is excavated, an anchor rod is drilled and constructed after the section height is excavated, and if water exists after excavation, forced drainage needs to be carried out to enable the displacement to be larger than the water inflow so as to ensure that no accumulated water exists on a working face; the steel plates are fixed through anchor rods, so that grouting gaps are formed between the steel plates and the well wall; a gap between the bottom edge of the steel plate and the well side is blocked by a certain height through foam; grout is injected through a grouting pipe on the lower portion of the steel plate, and a primary supporting structure is formed after solidification; secondary and more supporting can be carried out immediately or after primary supporting of multiple section heights is formed, and a permanent supporting structure is formed. A traditional passive waterproof mode is broken through, and active water plugging can be achieved; the method adapts to various construction methods and stratums; the temporary support is essentially different from a traditional anchor-shotcrete net temporary support, and the construction efficiency is higher.

The invention discloses a strip mine thick-layer soft rock slope supporting method, and relates to the technical field of slope supporting. Comprising the following steps that according to strip mine thick-layer soft rock slope data, supporting structure size parameters are designed, surface sealing is conducted on a thick-layer soft rock slope, anchor rod arrangement holes are drilled, pre-stressed anchor rods are installed in the anchor rod arrangement holes and fixed through grouting, lattice beams are installed, and concrete is poured to form a thick-layer soft rock slope support; before supporting construction, the concrete is sprayed on the surface of the thick-layer soft rock slope to be supported to seal the surface of the broken rock stratum, the integrity of the broken rock stratum can be guaranteed, the drilling hole forming rate is increased, and therefore follow-up anchor rod installation is facilitated, and the supporting construction efficiency and quality are improved to a certain degree; and the anchor rods and the lattice beams are fixedly combined, and concrete is poured to form a reinforced concrete support, so that the contact between the formed support structure and the side slope is stable enough, the overall stability of the side slope can be further improved, and the support is not prone to being damaged due to side slope settlement.

The invention relates to the technical field of hydraulic concrete materials, and particularly discloses nano-modified anti-rebound full-hole slag sprayed concrete, which is prepared from the following raw materials in parts by weight: 665 parts of hole slag aggregate, 950 parts of hole slag sand, 396 to 436.5 parts of ordinary Portland cement, 225 parts of water, 10 parts of polycarboxylic acid type water reducing agent and 8.5 parts of accelerator, the hole slag aggregate is further modified by a nano admixture, and the nano admixture is composed of nano kaolin, nano silicon dioxide and a precise PCE solution. The springback-resistant shotcrete is prepared from the nano admixture modified hole slag aggregate, full-quantitative resource utilization of tunnel excavation hole slag is achieved, the problems of occupied area of piled slag and potential ecological pollution are effectively relieved, the cement consumption in the concrete is reduced, the construction cost is reduced, meanwhile, the springback rate of the shotcrete can be remarkably reduced, and the construction period is shortened. The compactness of the concrete is improved, and the compression resistance degree and the crack resistance of the concrete are enhanced.

The invention relates to the technical field of sprayed concrete, in particular to high-early-strength low-resilience sprayed concrete and a preparation method thereof, specifically, the sprayed concrete comprises the following raw materials: cement, gravel, sand, a water reducing agent, an admixture, water and an alkali-free accelerator, and the admixture is obtained by performing plasma enhanced mechanical force chemical treatment on silica fume and slag. According to the invention, the adopted admixture is the slag composite micro powder coated with the nano silica fume, so that the problems of agglomeration and non-uniform dispersion caused by directly adding the nano silica fume into the concrete are avoided. When being applied to sprayed concrete, the concrete modifier can improve the early-stage and later-stage compressive strength of the concrete and also can reduce the rebound rate of the sprayed concrete.

The invention relates to an intelligent leveling machine for tunnel sprayed concrete, and belongs to the technical field of concrete construction machines. Comprising a walking mechanism, a telescopic arm mechanism and a slicking mechanism. A platform is arranged on the walking mechanism, a turntable is arranged on the platform, and the telescopic arm mechanism is arranged on the turntable; the other end of the telescopic arm mechanism is provided with the slicking mechanism; the slicking mechanism comprises a scraper capable of linearly moving back and forth; the telescopic arm mechanism rotates around a hinge shaft to drive the slicking mechanism to ascend and descend. The turntable drives the telescopic arm mechanism to rotate. The machine is used for strickling the inner wall of the tunnel after concrete spraying, automatic construction can be achieved, and the working efficiency is improved. The slicking mechanism of the machine has a long transverse movement stroke through the movement of the scraper and the movement of the mounting plate.

The invention discloses a high / ultra-high performance concrete full-automatic injection pump truck and a construction method, the high / ultra-high performance concrete full-automatic injection pump truck comprises a walking system, an efficient pumping and precise injection system, a hydraulic and intelligent central control system, a pre-injection pre-scanning system, a spraying-while-detecting system and a post-injection quality evaluation system, and the walking system is used for achieving movement and in-place of a pump truck; the efficient pumping and accurate spraying system is used for conveying and spraying concrete; the hydraulic and intelligent central control system is used for controlling the operation of the whole pump truck; the pre-spraying pre-scanning system is used for acquiring the three-dimensional form and defect information of a construction surface before construction; the spraying-while-detecting system is used for monitoring the concrete flow state and construction parameters in the spraying process in real time; the post-spraying quality evaluation system is used for carrying out nondestructive testing on the quality of a spraying layer after construction; according to the invention, full-process intelligent closed-loop control from construction surface scanning, path planning, real-time spraying adjustment to final quality evaluation is realized, and high quality, high efficiency and intelligence of concrete spraying construction are realized.

The invention discloses a CFD (computational fluid dynamics)-based TBM (tunnel boring machine) wet spraying primary lining constructability optimization method, and belongs to the technical field of tunnel construction. The method comprises the following steps: constructing a CFD geometric model comprising a jet nozzle, a tunnel ring surface and a closed computational domain, setting a multiphase flow model, viscosity parameters and a dynamic particle jet source, and simulating a concrete jet deposition process; representing partial liquid state behavior of sprayed concrete deposited on the wall surface based on the wall surface liquid film thickness, correcting a simulation result by synthesizing a scale factor after representing the actual spraying layer thickness, and introducing the scale factor to correct a simulation deviation; and the spraying angle, the spraying speed and the accelerator mixing amount are optimized in combination with the correction result, and optimal process parameters are generated and transmitted to a TBM control system to be executed. According to the method, physical experiments are replaced by virtual simulation, construction process visualization and result prediction are achieved, and the method is good in universality, high in simulation efficiency and suitable for efficient construction of the primary lining.

The invention relates to the technical field of underwater construction, in particular to a scouring repair and detection composite function robot for flow-state solidified soil, which comprises a cabin body, an underwater propelling device, a control device and a pouring device. The control device is provided with an attitude controller, the attitude controller is used for determining an attitude control signal according to the hydrodynamic torque and the guniting torque, and the attitude control signal is used for driving the underwater propelling device. According to the method, the hydrodynamic torque and the guniting torque are input to the attitude controller, the attitude controller calculates the total disturbance torque, then the antisymmetric matrix is calculated according to the disturbance torque, and the control parameters are output according to the antisymmetric matrix to adjust the propelling torque of the underwater propeller. The control parameters are calculated through the attitude controller according to the disturbance torque, so that the underwater propeller outputs the reverse propelling torque, the disturbance torque is counteracted to realize constant angular momentum, and attitude imbalance caused by interference of the robot during operation is prevented.

The invention discloses a high-water-pressure karst tunnel supporting structure and a construction method thereof, and relates to the technical field of tunnel supporting. The supporting structure comprises a primary supporting outer layer which is arranged on a rock wall on the surface of a wall body after tunnel excavation; the waterproof layer is arranged on the inner side of the initial-stage shotcrete-anchor support outer layer; the stress transfer layer is arranged on the inner side of the waterproof layer and comprises a first steel arch frame and a second steel arch frame, a plurality of supporting mechanisms and stress transfer mechanisms are arranged between the first steel arch frame and the second steel arch frame at intervals, and the supporting mechanisms and the stress transfer mechanisms are evenly distributed in the circumferential direction of the tunnel surrounding rock; the supporting structure has excellent waterproof performance and efficient stress coping capacity and can better adapt to dynamic deformation of surrounding rock.