48results about How to "Improve vibration quality" patented technology

The invention belongs to the field of vibration and noise reduction, and particularly relates to a constraint damping device capable of increasing the structure damping and achieving a good vibration and noise reduction function. A constraint damping noise reduction plate comprises a connecting plate and a constraint plate, wherein a connecting plate splicing rib and a constraint plate splicing rib are correspondingly arranged at spliced parts of the connecting plate and the constraint plate respectively; at least one of the connecting plate splicing rib and the constraint plate splicing rib is provided with a positioning groove in the mutually matched side face; an elastic isolating strip made of an elastic material is also arranged between the connecting plate splicing rib and the constraint plate splicing rib; the elastic isolating strip is partially embedded into the positioning groove; the connecting plate and the constraint plate are connected through an elastic isolating strip splicing buckle; the elastic isolating strip and a damping layer keep the connecting plate and the constraint plate elastically isolated. The constraint damping noise reduction plate is simple in structure and convenient to use, and can better block own vibration transfer, so as to achieve a better vibration and noise reduction effect.

The invention relates to a rail accessory, in particular to a deflection-resisting rail spacing device which comprises anti-bending binding beams and clamping components. The anti-bending binding beams are located below two steel rails on the same line and located between each two adjacent fasteners in the longitudinal direction of the steel rails, and the clamping components clamp and fix the two steel rails at steel rail webs or rail bottoms and at least partially fixed on the anti-bending binding beams. Transverse stiffness of the steel rails is enhanced while bending moment generated by the opposite rail bottoms when outside disturbing force is acted on rail heads of the steel rail can be offset effectively, shimmy of the steel rails during working can be controlled effectively, and the deflection-resisting rail spacing device is outstanding in advantage of overquick wear prevention of the steel rails and obvious in effect. In addition, the deflection-resisting rail spacing device is capable of effectively improving comfortability during train running and achieving excellent noise reduction performance, has the advantages of simple and compact structure, high utilization rate of rail space, excellent vibration reduction and noise reduction performances, economy, practicality, high applicability and the like, and quite wide in market application prospect.

The invention relates to a garden tool having at least one working blade for performing a cutting operation. The garden tool includes a user control part for user activation of the garden tool. A drive unit generates a working motion of the at least one working blade which has a blade region for a linear and / or oscillating working motion of the at least one driven working blade An electronic unit acts upon the drive unit with at least control and / or regulating signals, and an operating voltage unit furnishes an electrical energy supply to the electronic unit. It is proposed that the drive unit includes at least one excitation actuator having a volume of excitation-active material, which actuator is electrically supplied in operation by the operating voltage unit and is controlled or regulated by the electronic unit.

The invention discloses a method for beyond-limit arch replacing construction during preliminary bracing of a large-section loess tunnel. The method includes the steps of firstly, conducting radial grouting reinforcement on an arch wall, wherein radial grouting reinforcement is conducted on an arch replacing required section where arch replacing is required in the constructed loess tunnel from back to front; and secondly, conducting arch replacing construction, wherein a reinforced preliminary bracing structure in the arch replacing required section is detached, and preliminary bracing construction is conducted on the arch replacing required section synchronously in the detaching process. The method is simple in step, reasonable in design, simple in construction and good in use effect; theradial grouting reinforcement is conducted on the arch wall to reinforce the arch wall of a tunnel hole first, so the structural stability of the tunnel in the arch replacing process is ensured; segmented reinforcing is conducted on the preliminary bracing structure of the tunnel through a plurality of sleeve arch units for a reinforced sleeve arch in the arch replacing required section, so detaching is convenient; and moreover, the sleeve arch units are complementary and together improve the supporting force, so the adverse effects on the structural stability of the tunnel in the detaching process of each sleeve arch unit can be effectively reduced, and the safety and reliability of the arch replacing construction process are ensured.

The invention discloses a loess tunnel foundation base reinforcing structure and method based on high pressure jet grouting piles. The structure comprises the multiple rows of high pressure jet grouting piles for reinforcing soil on the lower portion of a tunnel, and each high pressure jet grouting pile passes through a tunnel invert structure and a collapsible loess stratum from top to bottom andthen extends into a non collapsible loess stratum. The method comprises the following steps of firstly, tunnel excavating and preliminary bracing; secondly, second lining construction; and thirdly, foundation base reinforcing. The structure is reasonable in design, easy and convenient to construct and good in use effect. The multiple rows of high pressure jet grouting piles are adopted for carrying out foundation base reinforcing on a loess tunnel, a loess tunnel foundation base can be simply and rapidly effectively reinforced, the tunnel foundation base settling volume can be effectively controlled, meanwhile, the upper surface of a secondary lining inverted arch is adjusted to the horizontal plane, a construction platform is provided for the high pressure jet grouting piles, the loess tunnel foundation base reinforcing process can be further quickened, the high pressure jet grouting piles and the tunnel invert structure are fastened and connected into a whole, and the loess tunnel foundation base reinforcing effect can be further improved.

The invention relates to the field of seabed immersed tunnel construction, in particular to a cooling method of mass concrete vibration. The method includes: a first air cooler is mounted on a top plate reinforcement cage, second air coolers are respectively mounted on two outer wall form boards, and the first air cooler and the second air coolers are communicated into a reinforcement cage form board through hoses. The method has the advantages that the air coolers are respectively mounted on the top plate reinforcement cage and the two outer walls, the air coolers are connected with the corrugated hoses communicated into the reinforcement cage, cold air is conveyed to lower vibration environment temperature, a cool vibration environment is provided to vibration workers, and vibration quality is increased; the method is simple in equipment, convenient in equipment mounting and demounting and high in cooling efficiency; meanwhile, the mounting positions of the air coolers are reasonable and effectively, the communicating positions of the corrugated hoses conveying the cold air are evenly distributed along the length of the reinforcement cage, evenly cooling inside the reinforcement cage is achieved, and smooth construction is guaranteed.

The invention discloses a large-section loess tunnel supporting system and a supporting construction method. The large-section loess tunnel supporting system comprises a tunnel forepoling structure, atunnel initial supporting structure and a tunnel secondary lining. The upper surface of an inverted arch secondary lining in the tunnel secondary lining is a horizontal plane, and an inverted arch backfill layer is arranged on the horizontal plane. The supporting construction method comprises the following steps of firstly digging a tunnel and conducting initial supporting; and secondly constructing the secondary lining and backfilling the inverted arch. The large-section loess tunnel supporting system is reasonable in design, easy and convenient to construct, high in construction efficiencyand good in use effect, the tunnel forepoling structure, the tunnel initial supporting structure and the tunnel secondary lining constitute a combined supporting system to stably and reliably supportthe large-section loess tunnel, the upper surface of the inverted arch of the secondary lining is adjusted to be a horizontal plane, the construction process of the inverted arch of the tunnel can beeffectively simplified, and the rigidity of the inverted arch of the tunnel is greatly improved; in this way, the construction efficiency of the tunnel secondary lining is improved, the ring sealingtime of the tunnel secondary lining is shortened, the integrity of the tunnel secondary lining is higher, and the overall force bearing effect is better.

The invention discloses a construction method of a loess tunnel entrance section through a landslide mass. The method comprises the following steps that 1, an entrance soil layer is pre-reinforced; 2,a tunnel entrance is constructed; 3, excavation and initial support construction is conducted on the reinforced tunnel section; 4, a reinforced tunnel section base is reinforced; 5, the reinforced tunnel section is subjected to secondary lining construction; 6, excavation and initial support construction is conducted on a rear side tunnel section; and 7, the rear side tunnel section is subjectedto secondary lining construction. The method is reasonable in design, simple and convenient to construct and good in use effect, cement-soil mixed piles are adopted for pre-reinforcement before excavation, a construction process of the tunnel entrance section through the landslide mass is guaranteed to be safe and reliable, meanwhile, the tunnel entrance section is excavated by adopting a three-step excavation method, the reinforced tunnel section base is reinforced, an excavation process of the tunnel entrance section through the landslide mass can be guaranteed to be safe and reliable, in addition, the influence on the stability of a soil layer on the circumferential side of the tunnel entrance is small, and the stability of the excavated and formed tunnel entrance can be effectively improved.

The invention discloses a tunnel portal section pre-reinforcement and excavation construction method based on partition blasting. The construction method comprises the following steps of 1, precipitation pre-reinforcement; 2, earth surface pre-reinforcement, and specifically, reinforcing the surface of a backfill section in a construction tunnel portal section through adopting a cement soil stirring pile; and 3, tunnel excavation construction, and specifically, carrying out excavation construction from rear to front in a plurality of excavation sections, wherein the process comprises the following steps of surveying and setting out, performing drilling and blasting construction, excavating an upper portal body, excavating a middle portal body and excavating a lower portal body. The construction method is reasonable in design, simple and convenient in construction and good in use effect; the underground water level is reduced through precipitation pre-reinforcement, and then surroundingrock is effectively reinforced; after the backfill section is subjected to surface pre-reinforcement through using the cement soil stirring pile, a three-step synchronous excavation mode is used forcarrying out partition blasting excavation, so that it is ensured that the tunnel excavation process is safe and reliable and a tunnel structure is stable.

The invention discloses a tunnel construction method for passing through the boundary stratum of earth and stone. The tunnel construction method comprises the following steps: I, excavation of a reartunnel segment and initial supporting construction; II, excavation of a middle tunnel segment and initial supporting construction; III, excavation of a front tunnel segment and initial supporting construction, wherein the rear tunnel segment, the middle tunnel segment and the front tunnel segment are all three-step synchronous excavated tunnel segments; and in the process of excavation from rear to front, constructing the secondary lining of the tunnel on the inner side of the initial supporting structure of the constructed tunnel from rear to front. The tunnel construction method has the advantages of reasonable design, simple construction and good use effect. The tunnel construction method selects an appropriate drilling and blasting method according to the position relationship betweenthe earth and stone interface and a tunnel hole, adopts a three-step synchronous excavation way to carry out blasting excavation, can ensure the safe and reliable excavation process of the tunnel passing through the boundary stratum of earth and stone, and can ensure the stable structure of the tunnel. Moreover, in the excavation process, the initial supporting structure and the secondary lining of the tunnel are adopted to provide stable and reliable supporting for the large-section tunnel.

The invention discloses a through landslide body loess tunnel construction method. The through landslide body loess tunnel construction method comprises the following steps of constructing a tunnel entrance section and a tunnel exit section simultaneously; and respectively constructing an inclined shaft auxiliary construction inlet section and an inclined shaft auxiliary construction outlet section through a tunnel inclined shaft when the tunnel entrance section and the tunnel exit section are constructed. The through landslide body loess tunnel construction method is reasonable in design, convenient to construct and good in using effect; the loess strata in the construction area where the tunnel entrance section is positioned is subjected to reinforcement treatment by using a cement soilmixing pile in advance before excavation, and the reinforcement length and the reinforcement depth are effectively limited; a loose soil body on a hole body of a tunnel hole is solidified in advance so as to ensure the safety and reliability of the construction process of a hole inlet section of the through landslide body loess tunnel; meanwhile, in the construction process of the tunnel by adopting a three-step excavation method, the construction process of track plates is completed synchronously, so that the construction process of the loess tunnel can be completed easily, conveniently and quickly; and the stability of an excavated and formed tunnel hole can be effectively improved.

The invention discloses a construction method of a water-rich loess tunnel capable of passing through a loess gulley. The water-rich loess tunnel comprises a tunnel entrance entering section, a gulleyshallow-buried tunnel section and a front side tunnel section, wherein the gulley shallow-buried tunnel section is connected between the tunnel entrance entering section and the front side tunnel section; the construction method comprises the following steps: 1, constructing the tunnel entrance entering section; 2, constructing the gulley shallow-buried tunnel section; and 3, constructing the front side tunnel section. The construction method is simple in step, reasonable in design, simple and convenient in construction and excellent in using effect; the reasonable look-ahead reinforcing method and the tunnel base reinforcing method are selected to reinforce the tunnel soil mass according to different stratums of the tunnel entrance entering section, the gulley shallow-buried tunnel section and the front side tunnel section, the excavation process of the water-rich large-cross-section loess tunnel can be effectively ensured to be safe and reliable, and the stability of the dug formedtunnel can be effectively improved.

A vibrating assembly having a rotating member, according to the present invention, has: a main body portion; and a vibrating body which is coupled to the main body portion and a vibrating body support unit and vibrates, wherein the vibrating body support unit has a rotating member rotatably provided on the vibrating body or the main body portion for supporting the vibrating body and has first and second connecting members which are rotatably connected to the upper and lower sides of the rotating member, with respect to the rotating center of same, and to the main body portion or the vibrating body, respectively such that the vibrating body can be supported in accordance with the main body portion, thereby, when the vibrating body vibrates in accordance with the main body portion, offsetting, by means of the rotating of the rotating member, the change in coupling positions of the first and second connecting members and the vibrating body due to the vibration.

The invention discloses a construction method of a soil-stone boundary tunnel passing through loess valleys. The construction method comprises the following steps of 1, precipitation pre-reinforcement; 2, excavation construction of a rear side tunnel section; 3, excavation construction of a middle tunnel section; and 4, excavation construction of a front side tunnel section, wherein the middle tunnel section and the front side tunnel section are three-step synchronous excavation tunnel sections; and in the excavation process from back to front in the step 2, the step 3 and the step 4, primarysupport is synchronously carried out on the excavated tunnel from back to front, and secondary lining of the tunnel is constructed on the inner side of the constructed and formed tunnel primary support structure from back to front. The construction method is reasonable in design, simple and convenient to construct and good in use effect, the underground water level is reduced through precipitationpre-reinforcement, surrounding rock is effectively reinforced, then blasting excavation is carried out in a three-step excavation mode, so that the excavation process of the soil-stone boundary tunnel passing through the loess valleys can be ensured to be safe and reliable, and the stability of the tunnel structure can be ensured.

The invention discloses a liquid mass double-tuned shock absorber, which comprises a base, a top cover, a rubber-metal composite part and a ball screw inerter component. The inerter component comprises a screw bolt, and one end of the screw bolt penetrates a center hole of the top cover to extend upwards while the other end is positioned in a step hole of the base. A ball screw portion of the screw bolt is provided with a screw nut through a ball, a rotating flywheel and a rolling bearing externally sleeve the screw nut, the inner periphery of the rolling bearing and a convex shoulder of the rotating flywheel are positioned through a convex shoulder of the screw nut, and the outer periphery of the rolling bearing is mounted in the step hole of the base. The ball screw inerter component isdesigned in the rubber-metal composite part to form a parallel support effect along with the same, the compact structure is realized, and the ball screw inerter component has an excellent performanceof low-frequency vibration absorption and overcomes the defect of the poor performance of a rubber shock absorber in low-frequency vibration absorption.

The invention discloses a deep-buried loess tunnel deformation control construction structure based on a cover arch and a method. The structure comprises a tunnel primary support structure body for primary support of a tunnel and the reinforcement cover arch arranged on the inner side of the tunnel primary support structure body, wherein the tunnel primary support structure body and the reinforcement cover arch form a reinforced primary support structure body. The method comprises the following steps of 1, carrying out tunnel excavation and primary support; and 2, carrying out reinforcement arc arch construction. The structure and the method have the advantages of being reasonable in design, simple and convenient in construction and good in use effect, the reinforcement cover arch is adopted to reinforce the tunnel primary support structure body and form the reinforced primary support structure body, an isolation layer is arranged between the reinforcement arc arch and the tunnel primary support structure body, in addition, the reinforcement cover arch adopts a plurality of cover arch units to reinforce the tunnel primary support structure body in a segmented mode, so that the construction is simple and convenient, moreover, the reinforced primary support structure body formed by construction has certain self-adaptive capacity and can effectively adapt to the deformation condition of soil mass on the peripheral side of the tunnel, and therefore the deformation resistance of the reinforced primary support structure body can be effectively enhanced.

The invention discloses an intelligent vibrating method for a high-strength concrete member. Through a PLC system, the number and location distribution of vibrating rods of end tenons are set up and the rising, falling, starting and stopping of vibrating parts of side tenons are reasonably controlled to achieve precise positioning vibration of the end tenons and the side tenons while vibrating theconcrete member. The PLC control system can detect the vibration power of each vibrating rod at different vibrating positions in real time. If one vibrating rod works improperly, the vibrating rod isstopped, the position of the vibrating rod and the time of vibration are recorded, and after a frame is horizontally moved forward to a next vibrating position, the PLC system drives a cart to move to the upper portion of a non-vibrating position and activates a vibrating-compensation rod rightly above the portion for vibration compensation. The entire equipment is only needed to automatically move from one end of the concrete member to the other end along the direction of moving during the initial setting time, so that all parts of the concrete member are uniformly and densely vibrated, andsince each part is vibrated before initial setting, the overall vibrating quality is greatly improved.

The invention discloses a construction method of a shallow-buried tunnel in a loess gully. The construction method comprises the following steps: 1, grouting a sleeve valve pipe for advancing reinforcement: carrying out sleeve valve pipe grouting for reinforcement on a stratum in the construction area of the constructed shallow-buried tunnel; 2, carrying out tunnel excavation and preliminary bracing; and 3, constructing a second lining. The construction method is simple in step, reasonable in design, simple and convenient in construction and excellent in using effect; the sleeve valve pipe isadopted and a plurality of rows of grouting holes are adopted to grout the reinforced stratum for reinforcement; the range of the reinforced stratum is specifically limited; both the tunnel hole bodyand the tunnel base can be reinforced, and the reinforcement effect is reliable; the shallow-buried tunnel construction method is particularly suitable for advancing reinforcement and excavation construction of the shallow-buried tunnel section which is positioned in a loess gully and is adjacent to an earth and stone interface, and the earth's surface of the shallow-buried tunnel is a silting-upland layer. The construction method can effectively ensure safety and reliability of the excavation process of the shallow-buried tunnel in the loess gully, can effectively improve the stability of the excavated tunnel hole and can effectively improve the bearing force of the tunnel base.

The invention relates to a shearing type elastic sleeper compound shock absorber for shock absorption of a steel rail. The compound shock absorber comprises a concrete sleeper (1), a rubber shock absorber (2) and an integral ballast bed (3) of cast-in-place concrete of the rail. The concrete sleeper (1) is in an elliptical table shape. A ring of groove (101) is arranged at the outer edge on the top end surface of the concrete sleeper (1) and the middle section of the concrete sleeper (1) is inwardly sunk, thereby forming a ring of sunk area (102). The rubber shock absorber (2) is in a gumshoe shape, the bottom (201) of the gumshoe is elliptical and the ring (202) of the gumshoe is in an elliptical ring shape. A plurality of small cone-shaped tables (203) are arranged on the top end surface of the bottom (201) convexly. A ring of flange (204) is arranged in the middle section of the inner ring of the ring (202) and a plurality of vertical grooves (205) are arranged uniformly on the flange (204). The rubber shock absorber (2) is embedded into the integral ballast bed (3) of cast-in-place concrete of the rail and the concrete sleeper (1) is embedded into the gumshoe-shaped rubber shock absorber (2).

The invention discloses a large-section tunnel excavation and support construction method for crossing a soil-rock boundary stratum. The method comprises the following steps of first, upper middle step excavation and initial support construction, specifically, carrying out upper step excavation and initial support construction on a construction tunnel by a plurality of excavation sections from rear to front, and when any excavation section is subjected to upper step excavation and initial support construction, the process comprises the following steps of measuring pay-off, drilling and blasting construction, excavation and initial support of an upper cave, and excavation and initial support of a middle cave; second, lower step excavation and initial support construction; and third, carrying out secondary lining construction. The method is reasonable in design, simple and convenient to construct and good in use effect, the upper blasting area in the upper step and the middle blasting area on the middle step are separately subjected to blasting zone division, the arrangement position of each shot hole in each blasting zone is defined, the collapse of a tunnel face or the collapse ofa vault caused by large vibration generated by blasting when one-time loading of the large section is excessive can be effectively prevented, the safety and reliability of the tunnel excavation process are ensured, and the stability of the tunnel structure is ensured.

The invention discloses a tunnel construction method for crossing the earth-rock boundary layer, which comprises the following steps: 1. Excavation of the rear tunnel section and initial support construction; 2. Excavation of the middle tunnel section and initial support construction; 3. Front side The excavation and initial support construction of the tunnel section; the rear tunnel section, the middle tunnel section and the front tunnel section are all three-step synchronous excavation tunnel sections; during the excavation process from the back to the front, the construction is formed from the back to the front Construction of the secondary lining of the tunnel is carried out on the inner side of the primary support structure of the tunnel. The invention is reasonable in design, easy in construction and good in use effect. According to the positional relationship between the soil-rock interface and the tunnel hole, a suitable drilling and blasting method is selected, and three-step synchronous excavation is used for blasting excavation, which can ensure the tunnel's tunnel crossing the soil-rock boundary. The excavation process is safe and reliable, and can ensure the stability of the tunnel structure; and during the excavation process, the tunnel primary support structure and the secondary lining of the tunnel are used to provide stable and reliable support for the large-section tunnel.

The invention relates to a construction method of spraying prefabricated T beams, comprising the steps of: 1) preparation of pedestal; 2) binding and installation of steel bars; 3) making of formwork; 4) installation of formwork; 5) pouring concrete; 6) vibrating concrete; 7) Formwork removal; 8) Concrete maintenance; 9) Wastewater recycling. The beneficial effects of the present invention are: the present invention arranges horizontal jacks on both sides of the T-beam pedestal as push-out demoulding devices, and the end molds are connected and fixed with the pedestal through anchor bolts, which can improve the integrity and stability of the T-beam formwork; The top platform and electric hoist are set above the T-beam formwork, which can not only temporarily fix and position the steel cage, but also drive the vibrating rod to vibrate the concrete at different parts, improving the quality of concrete vibrating; The sprinkler bracket is equipped with a swinging sprinkler head on the top, sprinkler bracket side frames are installed on both sides, and a hidden sprinkler head is installed inside the T-beam pedestal, which can spray the T-beam in an all-round way for health preservation.

Disclosed is an open-type elastic shorter tie vibration damping track structure. An efficient and fluent exhausting and water draining channel is provided for elastic vibration damping parts. The vibration damping property is improved and the service life is prolonged. The technical problem affecting the application and popularization of an elastic shorter tie vibration damping track in the long term is solved. The open-type elastic shorter tie vibration damping track structure comprises a monolithic track bed and the elastic vibration damping parts arranged at intervals in the extending direction of a line. Each elastic vibration damping part is composed of a shorter tie, an elastic covering sleeve and an elastic cushion layer. The outer side wall of each shorter tie is sleeved with the corresponding elastic cover sleeve, the elastic cushion layers are arranged between the bottom faces of the shorter ties and the bottom faces of the elastic covering sleeves, and the elastic vibration damping parts are embedded into an embedded groove formed at the time of casting the monolithic track bed in situ. The cross section of each shorter tie is in a variable cross-section shape in the length direction, and the outer side ends of the embedded groove and the elastic covering sleeves are provided with openings parallel and level to the transverse side face of the monolithic track bed.

The invention discloses a construction method for a connecting beam of a super high-rise building. A construction platform is erected by using an on-site tower crane, and then a scaffolding board and a wooden formwork are used to close the construction platform, and the position of the connecting beam on the primary platform is determined according to The design plan is to build a full house of scaffolding. The layered and staged pouring process is used during pouring to effectively reduce the impact of the load of the connecting beam on the primary and secondary construction platforms, and at the same time improve the quality of concrete vibration. Finally, after the strength of the connecting beam meets the design requirements, the secondary and primary construction platforms can be gradually dismantled, and the tower crane can be used to transfer the materials to the position of the next connecting beam, and the construction of another connecting beam can be continued. This construction method has high safety factor, convenient construction period and short period, cost saving by repeated use of materials, and is green and environmentally friendly. The invention is used in the field of high-rise building construction.

The invention relates to a vibrator material used for a vibration motor of a mobile phone and a preparation method thereof; wherein, a tungsten-nickel-copper alloy with the purity of equal to or more than 99.9 wt percent is adopted as the vibrator material with the contents of 95 to 97 wt percent of tungsten, 2-3 wt percent of nickel and 1 to 2 wt percent of copper. The preparation method of the vibrator includes the procedures of material mixing, adhesive mixing in, alloy powder granulating, particle screening of alloy powder, pressure casting and forming, sintering, postprocessing and the like. Compared with the prior art, the invention has the advantages that the vibrator of the vibration motor of the mobile phone is produced by using the tungsten-nickel-copper alloy material with highspecific gravity and is characterized by high gravity, intensity and rigidity, small expansion coefficient and good corrosion and oxidation resistance; nicer vibration quality, running stability and service life can be acquired; simultaneously, the invention can effectively decrease the volume of the vibration motor of the mobile phone and reduce the cost. The preparation method is high in industrial automation degree and production efficiency, simple in technological operation and good in property of prepared finished product.

The invention relates to a shearing type elastic sleeper compound shock absorber for shock absorption of a steel rail. The compound shock absorber comprises a concrete sleeper (1), a rubber shock absorber (2) and an integral ballast bed (3) of cast-in-place concrete of the rail. The concrete sleeper (1) is in an elliptical table shape. A ring of groove (101) is arranged at the outer edge on the top end surface of the concrete sleeper (1) and the middle section of the concrete sleeper (1) is inwardly sunk, thereby forming a ring of sunk area (102). The rubber shock absorber (2) is in a gumshoe shape, the bottom (201) of the gumshoe is elliptical and the ring (202) of the gumshoe is in an elliptical ring shape. A plurality of small cone-shaped tables (203) is arranged on the top end surface of the bottom (201) convexly. A ring of flange (204) is arranged in the middle section of the inner ring of the ring (202) and a plurality of vertical grooves (205) is arranged uniformly on the flange (204). The rubber shock absorber (2) is embedded into the integral ballast bed (3) of cast-in-place concrete of the rail and the concrete sleeper (1) is embedded into the gumshoe-shaped rubber shock absorber (2). The invention can effectively absorbs the higher-mode vibration energy of the steel rail, so as to shorten the construction period of the shearing type elastic sleeper compound shock absorber.

The invention discloses a large-section tunnel excavation and support construction method for crossing a soil-rock boundary stratum. The method comprises the following steps of first, upper middle step excavation and initial support construction, specifically, carrying out upper step excavation and initial support construction on a construction tunnel by a plurality of excavation sections from rear to front, and when any excavation section is subjected to upper step excavation and initial support construction, the process comprises the following steps of measuring pay-off, drilling and blasting construction, excavation and initial support of an upper cave, and excavation and initial support of a middle cave; second, lower step excavation and initial support construction; and third, carrying out secondary lining construction. The method is reasonable in design, simple and convenient to construct and good in use effect, the upper blasting area in the upper step and the middle blasting area on the middle step are separately subjected to blasting zone division, the arrangement position of each shot hole in each blasting zone is defined, the collapse of a tunnel face or the collapse ofa vault caused by large vibration generated by blasting when one-time loading of the large section is excessive can be effectively prevented, the safety and reliability of the tunnel excavation process are ensured, and the stability of the tunnel structure is ensured.

The invention discloses a method for beyond-limit arch replacing construction during preliminary bracing of a large-section loess tunnel. The method includes the steps of firstly, conducting radial grouting reinforcement on an arch wall, wherein radial grouting reinforcement is conducted on an arch replacing required section where arch replacing is required in the constructed loess tunnel from back to front; and secondly, conducting arch replacing construction, wherein a reinforced preliminary bracing structure in the arch replacing required section is detached, and preliminary bracing construction is conducted on the arch replacing required section synchronously in the detaching process. The method is simple in step, reasonable in design, simple in construction and good in use effect; theradial grouting reinforcement is conducted on the arch wall to reinforce the arch wall of a tunnel hole first, so the structural stability of the tunnel in the arch replacing process is ensured; segmented reinforcing is conducted on the preliminary bracing structure of the tunnel through a plurality of sleeve arch units for a reinforced sleeve arch in the arch replacing required section, so detaching is convenient; and moreover, the sleeve arch units are complementary and together improve the supporting force, so the adverse effects on the structural stability of the tunnel in the detaching process of each sleeve arch unit can be effectively reduced, and the safety and reliability of the arch replacing construction process are ensured.

The invention discloses a multi-layer frame energy dissipation and shock absorption design method based on a substructure of a frame structure. The method comprises the steps that 1, an equivalent scale reduction model of the multi-layer frame structure is established; 2, designing parameters of an energy dissipation and shock absorption device based on a substructure on the basis of the equivalent scale reduction model of the multilayer frame structure; 3, in finite element software, the effectiveness of the designed energy dissipation and shock absorption device is simulated and verified; and 4, installing a monitoring system at the key node of the real structure, updating the model in the step 1 based on the post-earthquake data, and repeating the steps 2 and 3 to realize the rapid recovery of the post-earthquake building function. According to the method, control parameters based on a substructure are designed based on multi-objective optimization, model updating is achieved through post-earthquake data, the problem that control efficiency is reduced due to system errors, observation errors or insufficient observation information completeness can be avoided, and the control effect and robustness of the method are ensured.

The invention discloses a construction method for connecting beams of a super high-rise building. The method comprises the following steps that a field tower crane is used for erecting a primary construction platform in a matched mode, then a scaffold floor and a timber formwork are used for closing the primary construction platform, and then an all-round scaffold is erected at the position of oneconnecting beam on the primary platform according to a design scheme; when pouring is carried out, a layered fractional pouring procedure is used, the influence of loads of the connecting beam on theprimary construction platform and a secondary construction platform is effectively reduced, and the concrete vibrating quality is improved at the same time; and finally, after the strength of the connecting beam reaches the design requirement, the secondary construction platform and the primary construction platform can be dismantled step by step, the tower crane is continued to be used for transferring a material to the position of one next connecting beam, and the another connecting beam is continuously constructed. The construction method has the advantages that the safety coefficient is high, the construction is convenient, the period is short, and the material is recycled, so that the cost is saved, and the construction method is green and environment-friendly. The construction method is used in the field of high-rise building construction.