41results about How to "Avoid grouting" patented technology

The invention discloses a buckling control support with the end provided with a staggered pyramid type energy consumption unit. The buckling control support is characterized by being composed of an end restraint section, energy consumption sections and a supporting flat section. The two ends of the buckling control support are connected with beams, column components or nodes through bolts to form a whole, so as to achieve the objective of improving lateral stiffness resistance of the components. The buckling control support with the end provided with the staggered pyramid type energy consumption unit maintains elasticity under the effect of a small earthquake; when the effect of a medium earthquake or a large earthquake occurs, the buckling control support enters a yielding phase, and the effect of a damper can be achieved due to the good hysteresis energy consumption performance of the buckling control support. Compared with a conventional buckling restraint support, according to the buckling control support, the processes of adding a sleeve outside a core energy consumption component in the conventional manufacturing process and performing grouting and the like are avoided in manufacturing process, and the buckling control support is convenient to manufacture. The support can be prefabricated in a factory, the component quality is guaranteed, the site construction operation workload is reduced, and the buckling control support saves energy and is environmentally friendly.

The invention relates to a bridge composite beam structure, in particular to a corrugated steel ventral shield preflex composite beam and a construction method thereof. The corrugated steel ventral shield preflex composite beam consists of an I-shaped girder provided with a corrugated steel ventral shield, and reinforced concrete boards coated outside the margin plates of the upper and the lower wings of the I-shaped girder. The corrugated steel ventral shield preflex composite beam can be applied to urban interchange engineering and high-speed railway bridge engineering. As the rigidity of the longitudinal bridge direction of the corrugated steel ventral shield is very small, which can not absorb preflex force when preflexing the girder, the loss of prestress of the structure under shrinkage and creep effects can be reduced; the excellent shear resistance bearing capacity of the corrugated steel ventral shield avoids cracks of the ventral shield, and the durableness of the structure is good; moreover, the invention also provides the construction method of the corrugated steel ventral shield preflex composite beam.

The invention relates to the field of mine filling body testing devices, and provides a molding device used for preparing mine milltailings filling check blocks and a check block preparation method. The molding device comprises a box-shaped frame, an isolation baffle, a water permeable bottom plate and a forming mold. The side walls of the box-shaped frame are detachable. The side walls of the box-shaped frame are provided with isolation baffle positioning grooves, and the bottom of the box-shaped frame is provided with bottom plate insertion groove holes and bottom plate positioning grooves. The isolation baffle is detachably connected with the box-shaped frame through the isolation baffle positioning grooves, and the bottom end of the isolation baffle is attached to the upper surface of the water permeable bottom plate. The water permeable bottom plate is detachably connected with the box-shaped frame through the bottom plate insertion groove holes and the bottom plate positioning grooves. According to the molding device, the man-made interference in the pouring process of filling slurry is reduced to the maximum extent, the regularity of the check blocks are improved, the testing method is simple and easy to be standardized, the precision of filling check block strength tests is effectively improved, and the molding device is suitable for manufacturing all kinds of mine filling check blocks, especially the preparation of high-requirement and standard check blocks with coarse aggregate slurry, high-concentration slurry, different dewatering conditions and the like.

The invention belongs to the technical field of foundation pit engineering, and discloses an anchoring type supporting system based on horizontal anchor cables and counter-force piles and a construction method thereof. The supporting system is composed of supporting piles, the counter-force piles, a supporting pile crown beam, a counter-force pile crown beam and the horizontal anchor cables, wherein the supporting piles are constructed on the side wall of a foundation pit, the supporting pile crown beam is poured on the tops of the supporting piles, the counter-force piles are constructed on a foundation pit outside soil body, the counter-force pile crown beam is poured on the tops of the counter-force piles, and the supporting piles and the counter-force piles are connected into a whole through the horizontal anchor cables penetrating through the supporting pile crown beam and the counter-force pile crown beam. According to the anchoring type supporting system based on horizontal anchor cables and counter-force piles and the construction method thereof, the rigidity and the overturning resistance of single-row supporting piles can be improved, deformation of the foundation pit is effectively controlled, and the defects that a traditional cantilever pile structure is low in overall rigidity and cannot meet the deformation control requirement easily are overcome; and meanwhile, the technical problems that underground pipelines around the foundation pit are complex, land use is limited, and conventional oblique anchor cables cannot be adopted are solved by using the horizontal inhaul cables, and a new thought and a new method are provided for a municipal foundation pit supporting structure.

The invention relates to a construction method adopting grouting to stop water in bare rock of an underground cavern and belongs to the technical field of civil construction. The construction method comprises six steps of determining a grouting range for a water seepage area of the underground cavern; determining parameters of grouting holes in the grouting range of the underground cavern; pre-burying a water seepage drainage pipe and a return pipe; spraying concrete in the grouting range; performing grouting in the grouting range with a method; ending grouting according to a standard. According to the construction method adopting grouting to stop water in the bare rock of the underground cavern, construction of the grouting holes and pre-burying of the drainage pipe before spraying of the concrete are sufficiently used, slide waste of the sprayed concrete material is reduced, combination of the sprayed concrete material with rock surface is increased, grouting is performed after concrete spraying according to the grouting ideas of grouting outer-ring holes firstly and then grouting inner-ring holes, grouting seepage-free holes firstly, then grouting small-seepage holes and finally grouting large-seepage holes, water seepage in the cavern is prevented effectively, repeated grouting to stop water is avoided, time is saved, and the construction progress is accelerated.

The invention discloses an underground excavation construction method for a large-span column-free underground station, and relates to the field of underground station underground excavation construction. The method comprises the steps that a longitudinal enclosure is constructed along the outer contour of an arched top plate of the underground station, and a left side pilot tunnel and a right side pilot tunnel are longitudinally constructed along the arch foot position of the top plate; a vertical enclosure is constructed in the supported side pilot tunnel, and a top beam is arranged at the top of the vertical enclosure; top plate arch feet and part of side wall structures are constructed in the side pilot tunnels, the arch feet and the top beam are anchored, and temporary cross braces are arranged between the side walls and the side pilot tunnels; advanced pre-grouting reinforcement is conducted on a soil body below the longitudinal enclosure, earthwork below the longitudinal enclosure is excavated section by section in the longitudinal direction, an arch top plate structure is constructed section by section, the arch top plate and arch feet are connected into a whole, and backfill grouting is conducted on the back of the top plate; after the arch crown structure is connected and reaches the design strength, a first underground layer soil body of the station is excavated, a side pilot tunnel primary support within the permanent structure range is broken, and a first underground layer middle plate and a side wall structure are constructed; and the remaining soil body is excavated layer by layer and the remaining station structure is constructed.

The invention discloses a buckling induction support with the ends provided with oblique spiral induction units. The buckling induction support comprises constraining sections, energy consumption sections and a supporting straight section. The energy consumption sections are arranged at the two ends of the supporting straight section and each composed of at least one oblique spiral induction unit in the axial direction of the support. Each oblique spiral induction unit is a space body formed by sequentially arranging m oblique spiral induction sub units in the oblique direction, and the section of each space body is a spiral line. Each oblique spiral induction sub unit is a space structure formed by folding two triangular plates in the plane. The elasticity of the buckling induction support is maintained under small earthquake action, enters a buckling stage under middle earthquake or large earthquake action, and can further achieve the effect of a damper through the good hysteric energy consumption performance of the buckling induction support. Compared with traditional buckling constraining supports, by adoption of the buckling induction support, the site construction operation workload is decreased, and energy saving and environmental protection are achieved.

The invention discloses a U-shaped steel-friction energy dissipation joint for a fabricated external hanging wallboard and an outer wall system. The U-shaped steel-friction energy dissipation joint for the fabricated external hanging wallboard comprises an upper joint body, the upper joint body comprises a first steel plate, the first steel plate is in a U shape, the first steel plate comprises two straight plates which are oppositely arranged, the end parts of the two straight plates are connected through an arc-shaped plate, a second steel plate is connected between the tops of the two straight plates, a third steel plate is arranged on the top of the second steel plate, a lower joint is arranged on the first steel plate, an I-shaped steel beam is connected between the first steel plateand the lower joint, a long round hole is formed in the second steel plate, a first bolt hole is formed in the third steel plate, a hole is formed in a lower flange of the I-shaped steel beam, and a first connecting piece penetrates through the long round hole, the first bolt hole and the hole to be connected with the second steel plate, the third steel plate and the I-shaped steel beam.

The invention discloses a buckling inducing brace with the ends provided with annular screw-type induction units. The buckling inducing brace with the ends provided with the annular screw-type induction units comprises retraining sections and energy dissipation sections and further comprises a brace straight section. The energy dissipation sections are arranged at the two ends of the brace straight section. Each energy dissipation section is composed of at least one annular screw-type induction unit in the axial direction of the brace. Each annular screw-type induction unit is a space body with a regular polygon section, wherein the space body is formed in the manner that m annular screw-type induction subunits are annularly and sequentially arranged. Each annular screw-type induction subunit is a space body which is formed by two collinear triangular plates through folding. The buckling inducing brace with the ends provided with the annular screw-type induction units keeps elasticity under the action of a small earthquake; and under the action of an intermediate earthquake or a large earthquake, the buckling inducing brace enters a yielding stage, and the buckling inducing brace can achieve the effect of a damper through the good hysteretic energy dissipation capacity. Compared with a traditional buckling restraining brace, the buckling inducing brace with the ends provided with the annular screw-type induction units lightens the on-site construction workload, saves energy and is environmentally friendly.

The invention relates to a prefabricated assembled pier and a connecting method thereof, a main reinforcement is wrapped with a sleeve, one part of the sleeve is pre-buried in a pier column, the other part of the sleeve is inserted into a bearing platform along with the main reinforcement, a non-bonding section formed by the sleeve can enable strain of the main reinforcement to be evenly distributed in a section of area, the deformability of the main reinforcement is remarkably improved, and then the ductility of the pier column is improved; the sleeve crosses a new and old concrete interface of the pier column and the bearing platform, erosive substances can be blocked or the path length of the erosive substances to the main reinforcement is prolonged, and the corrosion resistance and durability of the structure are remarkably improved; a grouting corrugated pipe is pre-buried in a bearing platform, when the pier column is connected with the bearing platform, grouting is conducted in the grouting corrugated pipe firstly, concrete slurry is slightly higher than the top face of the bearing platform to form a bedding layer, when the pier column falls, the main reinforcement is inserted into the grouting corrugated pipe under guiding of a specific guiding device, and the bottom of the pier column is compactly connected with the bedding layer; the main reinforcement is compactly connected with concrete slurry in the grouting corrugated pipe, so that the slurry jacking process is avoided, the construction process is simplified, and the construction efficiency is improved.

The invention discloses an energy consumption type buckling induction support with the ends provided with changeable-length four-fold type induction units. The energy consumption type buckling induction support comprises constraint sections, energy consumption sections and a supporting straight section. The energy consumption sections are arranged at the two ends of the supporting straight section and each composed of at least one changeable-length four-fold type induction unit in the axial direction of the support. Each changeable-length four-fold type induction unit is a space body formed by sequentially arranging m identical changeable-length four-fold type sub units in the circumferential direction, and the section of the space body is a polygon. Each changeable-length four-fold type sub unit is a space body formed by folding four trapezoidal plates in the same plane. The energy consumption type buckling induction support keeps elasticity under the effect of a small earthquake and enters a yielding stage under the effect of a medium earthquake or a large earthquake, and the effect of a damper can be achieved by means of the good hysteretic energy consumption performance of the support; and compared with traditional buckling constraint supports, by adoption of the support, the workload of site construction operation is decreased, energy is saved, and the environment is protected.

The invention discloses a buckling induction support with the ends provided with annular Y-shaped induction units. The buckling induction support comprises constraining sections, energy consumption sections and a supporting straight section. The energy consumption sections are arranged at the two ends of the supporting straight section and each composed of at least one annular Y-shaped induction unit in the axial direction of the support. Each annular Y-shaped induction unit is a space body which is formed by sequentially arranging m annular Y-shaped sub units in the annular direction, and the section of the space body is a regular m polygon. Each annular Y-shaped sub unit is a space body formed by collinearly folding two triangular plates and two trapezoidal plates located in the same plane correspondingly in pair. The buckling induction support keeps elasticity under the effect of small earthquakes, enters a yielding stage under the effect of medium earthquakes or large earthquakes, and can achieve the effect of a damper by means of the good hysteretic energy consumption performance of the support. Compared with traditional buckling constraint supports, by adoption of the buckling induction support, the workload of site construction operation is decreased, energy is saved, and the environment is protected.