70results about How to "Facilitate mechanized construction" patented technology

The invention relates to the technical field of railway tunnel construction, specifically a digging method of IV and V-class surrounding rock railway tunnel with large cross section, aiming to solve the problems of the existing railway tunnel digging method including narrow operation space, low work efficiency, inflexible construction method, instable construction progress, high deformation potential of surrounding rock, and inconvenient operation. The method comprises performing leading support, digging arc-shaped pilot tunnel and preserving core soil; staggeredly digging left/right side walls of middle sidestep and preserving core soil; staggeredly digging left/right side walls of lower sidestep and preserving core soil; sequentially digging upper, middle and lower sidesteps and preserving core soil; and digging inverted arch and carrying out preliminary support. The invention has large construction space and high work efficiency, and can perform multi-job parallel operation. When the geologic conditions are changed, the invention can be flexibly and timely converted to other construction method. Preservation of core soil and left/right staggeredly digging are helpful to the stability of the digging working face. When the surrounding rock has large deformation, the invention can adjust closure time as soon as possible under the prerequisite of assuring safety and meeting requirements of clearance cross section.

The invention discloses a draining and salt-removing method for a newly-ploughed salinized farmland, comprising the following steps of: making a simple farmland concealed pipe by utilizing a building PVC (Poly Vinyl Chloride) sewer pipe, uniformly drilling holes with the diameter of 3mm on the wall of a 100mm plastic sewer pipe by the punching rate of 75 percent, coating two to three layers of crude chemical fiber outside the wall of the pipe, and strapping with plastic ropes; digging several rows of concealed pipe ditches in the newly-ploughed salinized farmland, wherein the depth of the concealed pipe ditches is 1.5-2.0m, the bottom width is 30cm and the specification of the side slope is 1:0.5; paving plastic weaved cloth with the width of 40cm at the bottoms of the ditches, paving sand gravel with the thickness of 15cm on the plastic weaved cloth, paving a coated concealed pipe, paving and spreading sand gravel with the thickness of 15-20cm at the surrounding and the upper part of the concealed pipe, paving the plastic weaved cloth with the width of 40cm on the sand gravel and refilling. The invention mainly solves the technical problem of draining by the concealed pipe in the newly-ploughed salinized farmland in aired regions and has a wide application value on the aspects of prevention and control of salinization and secondary salinizaiton of farmland in the dried regions, reformation and utilization of the farmland in the dried regions as well as prevention and control of desertification.

The invention provides interior wall plastering mortar, which is prepared by mixing the following components in part by weight: 30 to 35 parts of ordinary Portland cement, 4 to 5 parts of hydrated lime, 5 to 10 parts of light aggregate, 50 to 60 parts of heavy aggregate, and 1.0 part of C-type composite auxiliary, wherein the light aggregate is an inorganic vitrified hollow cellular material of which the fineness is lower than 100 meshes; the heavy aggregate is ordinary river sand; and the C-type composite auxiliary is sold by Guangzhou Hecheng Trading Company. The construction method for the interior wall plastering mortar comprises the following steps: diluting the light energy-saving interior wall plastering mortar with water accounting for 30 to 50 percent of the weight of the mortar; and mechanically or manually stirring the diluted mortar until the mortar is mixed uniformly to achieve the viscosity suitable for mechanical spraying or manual construction. Therefore, the mortar can be sprayed mechanically or constructed manually. The interior wall plastering mortar has light weight and energy conservation, can prevent hollowness, cracking and falling off by being matched with a light wall body, can effectively reduce cracking of the mortar, ensures the quality of construction work, has the advantages of heat insulation and noise reduction, low cost of unit area, good grain composition, good peaceability, mechanical construction contribution and simple process.

The invention discloses high-performance lithium slag pump concrete. The proportion of mixture of the concrete is cement:water:mineral powder:fly ash:lithium slag:sand:gravel:synergist: additive being (340-520):(165-200):(0-50):(0-50):(40-150):(700-850):(1,000-1,100):(2-3.5):(7-12) according to the component unit of kg/m<3>. By means of selection of the raw materials and design of proportioning, the high-performance lithium slag concrete which is good in working performance, mechanical performance and durability and can be used for pumping is obtained.

The invention discloses a shallow mud foundation treatment method. The method includes: zoning a site to be treated; laying drain boards in a soft soil layer from top to bottom by a floating raft; connecting the ends and middle of the drain boards to a tube drainage system through tube plate connectors; connecting the upper end of the tube drainage system to a vacuum unit; laying woven fabric, geogrid, nonwoven geotextile and seal film on a mud surface from top to bottom; performing vacuum preloading and unloading after requirements are met. The shallow mud foundation treatment method has the advantages that construction period is shortened greatly, vacuum transmission is effective, using sand cushions is avoided, and deformation of the drain boards is reduced greatly.

Disclosed is a large-span subway station underground excavation construction method for a hard rock stratum. The large-span subway station underground excavation construction method for the hard rock stratum is used for effectively reducing the excavation construction risk and improving the excavation construction efficiency. The large-span subway station underground excavation construction method for the hard rock stratum comprises the following steps that the arch portion middle of a station is divided into two steps to be excavated, a tunnel arch portion middle upper step is excavated, and an initial support arch cover of the tunnel arch portion middle is constructed; a tunnel arch portion middle lower step is excavated; a tunnel arch portion left side portion and a tunnel arch portion right side portion are excavated, feet-lock bolts are constructed at the arch foot positions, the initial support arch cover on the arch top is lengthened through connection, and construction of the initial support arch cover is accomplished; a rock mass arranged below the station is excavated in a slot broaching mode under the protection action of the initial support arch cover, nine portions including upper steps on the left portion, the middle portion and the right portion, middle steps on the left portion, the middle portion and the right portion and lower steps on the left portion, the middle portion and the right portion are excavated, and side wall initial supports of corresponding sections are constructed until the rock mass is excavated to the bottom; and a station body structure is sequentially constructed from bottom to top, and station construction is accomplished.

The light energy-saving heat insulating wall material is produced with light aggregate in 1.2-2.6 wt%, gelating material in 72-76 wt% and sand in 22-26 wt%, as well as water in 35-88 wt% of gelating material, bulking agent in 13 wt% of gelating material and water reducing agent in 1 wt% of gelating material. The light energy-saving heat insulating wall material has the advantages of saving in land, low power consumption, light weight, easy construction, high heat insulating performance, etc. and may be used in network structure building system and non-bearing wall building system.

The invention belongs to the technical field of agricultural irrigation and particularly relates to a water-saving irrigation pipeline and a construction method thereof. The water-saving irrigation pipeline comprises a spodosol packing layer which is arranged in a foundation trench and a composite flexible pipe which is fixedly arranged in the spodosol packing layer, wherein the composite flexible pipe comprises a flexible pipe base layer, a PVC (Polyvinyl Chloride) coated layer and a PE (Poly Ethylene) thin-film layer from outside to inside. The construction method comprises the steps of material selection, foundation trench excavation, spodosol slotting, pipe laying, pipeline inspection, water-immersion compacting and the like. According to the water-saving irrigation pipeline, the problems such as pipeline breakage, water exclusion and operation difficulty which are brought by the structure and construction problems in the prior art are solved; the water-saving irrigation pipeline has the advantages of water-saving property, energy-saving property, land-saving property, simplicity and practicability in construction, short construction period and the like, and can be popularized in a large area, so that a new way is provided for saving water for the agriculture in China.

The invention provides a design method for an agricultural drain concealed conduit with an externally coated filter material. The method is integrating a filter material layer and a drain concealed conduit, so as to form an integral finished product, wherein the filter material layer comprises a straw rope layer and a geotextile layer. The method comprises the following steps: winding a straw rope tightly on the outer wall of the drain concealed conduit, so as to form a straw coated layer; coating geotextile on the straw rope; and winding a nylon rope on the geotextile layer, so as to ensure that the geotextile and the part in the geotextile are integrated without loosing. The diameter of the straw rope is 2 to 3 cm; and the geotextile comprises cloth strips which are 20 cm in width. The invention has the advantages that the water seepage capability of the passage of the agricultural drain concealed conduit is improved; the drain effect of the agricultural drain concealed conduit is improved; the mechanized construction is more convenient; and the burying process of the agricultural drain concealed conduit is simplified.

The invention discloses a construction method for a weak surrounding rock section of a short-step super-large-section tunnel, and belongs to the technical field of tunnel construction. The construction method comprises the following steps that S1, a top arc-shaped pilot tunnel is excavated; s2, middle steps on the two sides are excavated left and right; s3, excavating lower steps on the left side and the right side; s4, core soil is excavated; and S5, tunnel bottom excavation and inverted arch supporting are carried out. The construction method is high in safety, fast in construction progress, short in construction period, stable in supporting structure, short in forming time of each whole ring, large in construction space, convenient for mechanical deslagging, fast in construction effect and capable of effectively shortening the closed ring forming time.

The invention discloses a ceiling putty leveling troweling machine, which comprises a lifting motor, a chain wheel, a chain, a scraper driving motor, a troweling knife rail, an automatic lifting inductive switch, a vertical rod, a base and the like. The lifting motor and the vertical rod are mounted on the base, and an output shaft of the lifting motor is connected with a screw; a nut fixed to thevertical rod and the screw form a spiral transmission pair, and the vertical rod is connected with a steering gear compass; a travel switch is mounted on the vertical rod, and a support is connectedto the upper part of the vertical rod; an output shaft of the scraper driving motor is connected with a chain wheel rotary shaft, and the chain wheel is mounted on the chain wheel rotary shaft; the chain wheel rotary shaft is supported on a skeleton, the chain wheel rotary shaft drives the chain wheel to rotate, and the chain wheel drives the chain to rotate; and a plurality of troweling knives fixed to the chain rotate simultaneously, the multiple troweling knives stabilize traveling tracks of the troweling knives through the troweling knife rail, and the automatic lifting inductive switch capable of setting the height from the troweling knives to a ceiling is mounted on the skeleton. The ceiling putty leveling troweling machine is high in automation degree, free of pollution, easy to operate, small in energy consumption, capable of automatically ascending and descending, and high in efficiency.

The invention discloses an organic fiber PVC (Polyvinyl Chloride) multilayered composite flexible pipe and a preparation method thereof, aiming at solving the technical problems of a pipe for agricultural irrigation in the prior art that the corrosion resistance is poor, the toughness and the tensile strength are poor, the anti-cracking performance and the anti-freezing performance are poor, and the price is high. The organic fiber PVC multilayered composite flexible pipe comprises a pipe body, wherein a polyvinyl chloride plastic coating layer is arranged on the inner wall of the pipe body, and a composite plastic film layer is arranged on the plastic coating layer; the pipe body is made of the following raw materials in parts by weight: 28-33 parts of polyacrylonitrile fibers, 8-12 parts of liquid-state silica gel and 3-7 parts of liquid-state PVC stabilizing agent. The pipe has very remarkable advantages in the aspects of cracking strength, acid and alkali resistance, low-temperature resistance and cracking elongation and is a very ideal irrigation and water conveying pipe; mechanized construction is convenient to realize and the working efficiency is improved; the pipe is convenient to operate and maintain in a water conveying and irrigation process and is convenient to repair, and the reliable water supply is ensured.

The invention discloses a slide-resistant pile and geogrid combined damaged mountain repair method and structure, and belongs to the technical field of damaged mountain environmental government. A repaired mountain is formed through soil filling based on an original damaged mountain, a side slope and a sliding face exit after filling, multiple rows of slide-resistant piles are arranged on the middle and front portions of the side slope, reinforced concrete coupling beams are arranged at the tops of the slide-resistant piles, the slide-resistant piles are inserted into the lower portion of thesliding face of the side slope and embedded into stable original bed rock, and horizontally-laid geogrid reinforcing areas are arranged on the top of the filled mountain. By means of the structure andthe method, the slide-resistant piles and geogrids are combined to resist sliding to ensure overall stability of the mountain. A supporting structure which combines a support and reinforcement ribs and is easy to construct and high in slide resistance is formed on the side slope, and the overall side-resistant effect is achieved on the filled mountain.

The invention discloses a steep slope high-filling roadbed structure adopting a high-density EPS filler. The steep slope high-filling roadbed structure comprises short piles, cross beams, stand columns, an enlarged foundation, longitudinal connecting beams, a bearing plate, breast boards, a light filler, a sand cushion layer, a pavement slab, an anti-collision guardrail and side ditches. The self-weight and soil side pressure of a roadbed filling material are reduced, the utilization efficiency of a supporting structure material is improved, and therefore, the roadbed structure is more reasonable in stress, the structural stability of the roadbed structure is remarkably improved, the mass of the supporting structure of the roadbed structure is effectively reduced, and the problem of roadbed structure design mainly based on fill in a steep-slope high-fill roadbed is effectively solved to a certain extent. The steep slope high-filling roadbed structure is good in adaptability to mountainsteep slope terrains, safe and reliable in structure, moderate in construction difficulty and good in environmental and economic benefits, provides great convenience for mountainous engineering construction, and has popularization and application value in the technical field of highway engineering.

The invention provides a rotary-jet anchor cable composite foundation and belongs to the field of electric transmission line foundation engineering. The composite foundation comprises a top foundationand a pulling cable; an open hole is formed in the center of the top foundation; one end of the pulling cable is fixed to the open hole; the other end of the pulling cable extends towards the deep position of soil and is fixedly connected with an anchor head provided with a conical head; a rotary-jet pile formed through injection into the soil layer with a high-pressure jet grouting method is adopted between the anchor head and the bottom surface of the top foundation; and the anchor head, the pulling cable and the top foundation are combined into one by the aid of the rotary-jet pile. The composite foundation is simple and stable in structure, mechanical construction is adopted mainly, and construction operations can be reduced correspondingly, so that the construction difficulty and cost are reduced while the upwards-pulling requirement is met, and the influence on the environment is reduced.