30 results about "Circular arch" patented technology

The invention discloses a double-layer three-center circular-arch-shaped subway station structure which comprises an arch-shaped top plate, two side walls connected with the two ends of the arch-shaped top plate respectively, a middle plate arranged between the two side walls and a bottom plate arranged at the bottoms of the two side walls, and the middle plate divides the subway station structure into an upper layer and a lower layer; the arch-shaped top plate is a three-centered circular arch-shaped top plate, two arches connected with the two side walls are tangent to the corresponding side walls respectively, and the rise span ratio of the arch-shaped top plate is 0.15-0.4. The problems that a rectangular subway station is poor in structural stability, low in space utilization rate, high in long-term maintenance cost and poor in attractiveness can be solved.

The utility model discloses a high-temperature cracking shaping tool for a ceramic-based composite sheet, relates to the technical field of ceramic-based composites, and can solve the problems that a shaping tool in the prior art cannot shape a product at one time and is troublesome to disassemble and assemble. The high-temperature cracking shaping tool for the ceramic-based composite sheet comprises an upper die and a lower die which are detachably connected, and the upper die comprises a cover plate and a first forming structure arranged at the bottom of the cover plate; the lower die comprises a base and a containing groove formed in the center of the top face of the base, and the bottom of the containing groove is provided with a second forming structure used for being matched with the first forming structure to enable the circular arch structure of the ceramic-based composite to be formed.

The utility model discloses an anti-loosening disc spring which is a chamfered-edge conical elastic gasket, commonly known as a chamfered-edge disc spring (13) and comprises a conical gasket, a ring top (12) is smaller than a ring bottom (14), the ring top (12) and the ring bottom (14) are circular, the circle center of the ring top (12) and the circle center of the ring bottom (14) are connected through a coaxial line (21), the diameter of the ring top (12) is larger than that of a screw rod (4), and the diameter of the ring bottom (14) is larger than that of the ring top (12). The shaft (21) is perpendicular to the collar top (12) and the collar bottom (14). The disc spring is characterized in that the round edge of the ring bottom (14) is provided with at least one chamfered round flaw arch door (24), or a guide chamfered arch door (25) is chamfered to form an asymmetric chamfered disc spring (26), and the disc spring creeps in one direction and is self-tightened and prevented from loosening during vibration. The axial section line of the outer conical surface (15) is in a straight line shape (23), or in an outward convex arc shape (19), or in an inward convex arc shape (20). The anti-loose disc spring (11) is simple in structure, easy to produce, low in cost, good in anti-loose performance, convenient to install and capable of being used repeatedly.

The application relates to the technical field of landscape bridges, and discloses a circular-rib arch bridge and an arch bridge construction method, which comprises arch bridge units, each of which comprises an arch bridge main frame and an arch ring assembly arranged above the arch bridge main frame; the arch bridge main frame comprises a first base, curved beam parts symmetrically arranged at two ends of the first base and cross beam parts, one end of each curved beam part is fixedly connected with the first base, the other end is connected with a cross beam part, a bridge deck is arranged between the two cross beam parts, and each cross beam part is provided with a second base for supporting the cross beam part at an end away from the curved beam part along a second direction; and the first base comprises two bearing platforms, and a main arch ring is arranged between the two bearing platforms; the arch ring assembly is symmetrically arranged at two ends of the main arch ring along a first direction, the arch ring assembly comprises a main circular arch and secondary circular arches arranged at two ends of the main circular arch along the first direction, the bottom end of the main circular arch is fixedly connected with the bearing platform, and one end of each secondary circular arch is hingedly connected with the main circular arch.

The present invention discloses a modeling method for a parametric model of a circular arch straight wall type top arch component, comprising the following steps: creating a model of the circular arch straight wall type top arch; defining input parameters of the model graphics and logical operation parameters between the input parameters, wherein the logical operation parameters are used to implement constraint relationships between geometric figures constituting the model; and defining model output quantities of the model, wherein the model output quantities include: model volume, top arch segment surface area, related support quantity, and excavation quantity. According to the above technical solution, the "family" function of Rev it software can be used to complete the creation of a parametric three-dimensional model of a circular arch straight wall type top arch component of an underground cavern. By secondary processing of the BIM model information, automatic statistics of related engineering quantities can be achieved, thereby solving the problems of low efficiency in family modeling of irregular cavern top arch types and low application of model information in Rev it software.

The present invention discloses a method for reinforcing an H-shaped steel truss arch of a corrugated steel plate circular arc arch bridge, which relates to the technical field of traffic engineering construction, comprising the following steps: cold-bending multiple sections of H-shaped steel and extending them to form a semicircular arc-shaped H-shaped steel truss arch; lining an H-shaped steel truss arch in the middle of each circumferential plate width of the corrugated steel plate circular arc arch, with the two edges of the upper flange of the H-shaped steel truss arch completely contacting the two sides of the inner trough of the corrugated steel plate circular arc arch; A hard rubber pad is pasted between the gap formed by the contact between the upper flange and the trough on the inner side of the corrugated steel plate circular arc arch bridge; a lining steel plate is set on the corrugated steel plate circular arc arch seat at the arch foot of the H-shaped steel truss arch to support the arch foot of the H-shaped steel truss arch on the lining steel plate; a steel strip connecting belt is set along the transverse corrugation direction at the cross section of the arch crown, arch shoulder, and arch foot of the H-shaped steel truss arch to connect the multiple H-shaped steel truss arches under the arch of the corrugated steel plate circular arc arch bridge into one. The present invention forms a steel truss arch by lining the corrugated steel plate circular arc arch bridge with H-shaped steel, reinforces the corrugated steel circular arc arch bridge, makes it less likely to deform when subjected to radial compression, maintains or improves the load bearing capacity, and extends the service life of the corrugated steel plate arch bridge, with good results.

The application relates to the technical field of tunnel construction, and discloses a tunnel initial support shotcrete flatness adjusting device and a construction method, the device comprises a circular arch beam track, a moving assembly sliding along the circular arch beam track, and at least two arc-shaped baffles; the space between the arc-shaped baffles and the inner wall of the tunnel serves as a shotcrete operation space; the moving assembly is respectively provided with a supporting rod capable of driving the arc-shaped baffles to move and a concrete shotcreting arm facing the shotcrete operation space. Through the cooperation of the above components, the arc-shaped baffles can alternately adhere to the inner wall of the tunnel under the action of the supporting rods, concrete is shotcreting in the shotcrete operation space, the shape of the concrete is effectively limited, the concrete is initially set and formed in the shotcrete operation space, the shotcreting concrete has excellent flatness during the overall construction, and the construction efficiency is remarkably improved.

The invention relates to the technical field of tunnel engineering lining construction equipment, in particular to a device for grabbing a large-tonnage arc tube piece type prefabricated lining, which comprises a circular arch beam track arranged on a trolley and a servo trolley sliding along the circular arch beam track, the servo trolley comprises a trolley body and a grabbing mechanism, the grabbing mechanism comprises an arc-shaped flitch plate and a lead screw lifting machine which is arranged at the corner of the trolley body, independently controlled and hinged to the inner arc face of the arc-shaped flitch plate, the curvature of the plate face of the arc-shaped flitch plate is matched with the curvature of the inner wall of the arc prefabricated lining segment to be grabbed, and a hydraulic fixing pin is further arranged on the arc-shaped flitch plate. Large-area rigid contact type grabbing of the large-tonnage prefabricated lining segments is achieved through cooperation of the arc-shaped flitch plates and the hydraulic fixing pins, the prefabricated lining segments can be stably conveyed to the mounting position through cooperation of the circular arch beam track and the servo trolley, then the mounting position is finely adjusted through the lead screw lifting machine, and the working efficiency is greatly improved. The problems that in the prior art, when large-tonnage prefabricated lining segments are grabbed, the large-tonnage prefabricated lining segments shake easily, and the installation precision is uncontrollable are solved.

TITLE: METAL-TEXTILE TYPE BUILDING STRUCTURE One aspect of the invention relates to a metal building structure 1 comprising a mast 2 extending longitudinally along a principal vertical axis X and a framework 3 comprising: A first generally circular arch 4 coaxial with said mast 2; A plurality of framework elements 5 arranged around said mast 2, each framework element 5 extending radially between said mast 2 and said first arch 4, each framework element 5 comprising: A straight beam 6 perpendicular to said principal axis X and extending between said mast 2 and said first arch 4; A curved beam 7 arranged opposite said straight beam 6 and extending between said first arch 4 and an upper end 8 of said mast 2. Figure to be published with the abbreviation: Figure 2

This utility model provides a protective device for outdoor electrical cabinets, relating to the technical field of protective devices. It includes an electrical cabinet with two sets of openings (top and bottom). Supporting members are located at the four corners of the bottom of the cabinet, each member being a downward-opening semi-circular arch. Inner corner frames are provided at the internal corners of the cabinet, and outer corner frames are provided at the external corners. An opening frame is provided at the front opening of the cabinet. This utility model can prevent the electrical cabinet from becoming damp and deformed due to rainwater intrusion, as well as from being corroded, thus preventing it from affecting its quality and lifespan. It can also prevent prolonged exposure to sunlight, preventing damage to the electrical components inside the cabinet. This solves the problem of existing electrical cabinets lacking protective devices and being easily corroded.

The invention relates to a semicircular arched full-section roadway excavation device which is used for excavating a round-section roadway into a semicircular arched-section roadway. The semi-circular arch-shaped full-section roadway excavation device comprises a hob milling and excavating assembly which comprises a milling and excavating hob which extends transversely and can rotate, and the milling and excavating hob cuts arc-shaped side walls on the two sides of a round-section roadway into vertical side walls of the semi-circular arch-shaped section roadway; the gangue collecting assembly is arranged behind the hob milling and excavating assembly, extends forwards in the axial direction and is unfolded towards the outer side of the hob milling and excavating assembly, and the gangue collecting assembly collects gangue cut by the hob milling and excavating assembly to an arc-shaped bottom arch of the round-section roadway; and the bottoming and compacting assembly is arranged behind the gangue collecting assembly, the bottoming and compacting assembly is provided with a rolling element capable of continuously rolling, and the gangue in the arc-shaped bottom arch is compacted and flattened. The hob milling and excavating assembly excavates a circular roadway into a semicircular arch shape, the gangue collecting assembly and the bottoming and compacting assembly fill and level up an arc-shaped bottom arch of the roadway, and one-time forming of the semicircular arch-shaped section roadway is achieved.

The present invention relates to a hyperbolic steel corrugated plate shell concrete combined arch-type highway-railway overpass, the overpass including an arch ring arranged on a railway line, the arch ring being a steel plate concrete composite load-bearing arch ring structure composed of an arch ring steel plate frame and concrete poured on one side of the arch ring steel plate frame; the arch ring steel plate frame is formed by arranging and splicing a plurality of hyperbolic curved steel corrugated plate shells in a matrix, the arched sides of the steel corrugated plate shells being spliced ​​with a steel bar frame; the steel corrugated plate shells are formed by rolling a flat steel corrugated plate with upwardly extending plate teeth on both sides, and then bending the plate shells twice to form upwardly curved circular arch waves in the transverse direction, and to produce an arch deformation with the same curvature as the arch ring in the longitudinal direction. The overpass structure of the present invention has great compressive and bending rigidity and deformation resistance, without the need for an under-arch support, and has a simple construction process, a short construction period, and a low cost.

This disclosure relates generally to a payload separation system utilizing a circular arch connective mechanism for connecting and releasing a payload from a launch vehicle. The apparatus of the invention is particularly useful for spacecraft and other vehicular separation mechanisms.

This disclosure relates generally to a payload separation system utilizing a circular arch connective mechanism for connecting and releasing a payload from a launch vehicle. The apparatus of the invention is particularly useful for spacecraft and other vehicular separation mechanisms.

A multi-part last that can be disassembled in a gently manner, comprising a front portion (20), a rear portion (30), and a wedge portion (40), wherein the bottom of the front portion has a rearwardly extending projection (21), the bottom of which forms part of the bottom of the last (10), which ends in a rear support (22) having an end forming a first circular arch (23), and the front portion is partially open at the top, has a partially open and partially closed cavity (27) shaped in the form of a second circular arc (26), and the lower portion of the rear part has a front face resting on the circular arc of the rear support, and in addition the rear part has a locking projection (34) introduced into and terminating in said cavity, the front and upper faces of which are curved in said second circular arc, and a part of the last (10), when assembled, rests against the concave inner wall of the cavity, which is curved in accordance with the second circular arc, and the wedge part has a shape that fits in a cavity formed between sections (31, 32) forming the frontal surface of the rear part and sloping downwards from above, and sloping lower and upper wedge sections (28, 29), of the front part, wherein said circular arcs are concentric with each other and have their centers (O) at or below the line of the bottom of the last, and the assembled last can be removed from the front part by partial rotation of the rear part about the center after removal of the wedge.

The utility model relates to the technical field of circular arch greenhouses, in particular to a rainproof top windowing system of a circular arch greenhouse, which comprises a plurality of groups of first frameworks and a plurality of groups of second frameworks, and the plurality of groups of first frameworks are fixedly connected with the plurality of groups of second frameworks; covering films are arranged on the upper sides of the multiple first frameworks and the multiple second frameworks, a rain shelter is installed at the upper ends of the multiple first frameworks, stand columns are installed on the upper sides of the upper ends of the multiple second frameworks and the lower side of the rain shelter in a front-back symmetry mode, and a dustproof net is installed between the two stand columns. The upper ends of the first frameworks are fixedly connected with the upper ends of the second frameworks, the rain sheltering shed is installed on the first frameworks, and when the skylight on the top of the circular arch greenhouse formed by connecting the first frameworks and the second frameworks is punched, rainwater is folded through the rain sheltering shed and the dustproof net, so that the skylight on the top of the circular arch greenhouse is folded; rainwater drifting caused by opening of the skylight in rainy days is avoided, and opening of the top of the circular-arch greenhouse in rainy days is facilitated.

The invention belongs to the technical field of hydrogen mixing, and provides a natural gas and hydrogen mixing combustion system with a semicircular-section flute-shaped pipe and a working method of the natural gas and hydrogen mixing combustion system. Compared with a triangular structure, the hydrogen delivery pipe adopting a semicircular structure has the advantages that the semicircular arched structure has no fixed sharp separation point, and the flow separation point can smoothly move at the arched rear end along with the change of Reynolds number, so that vortex structures with different scales and diversified frequencies can be excited in a wider flow velocity range, and the flow velocity of the hydrogen delivery pipe is increased. The characteristics that a vortex street of a triangular structure is single in frequency and sensitive to flow velocity change are overcome, broadband mixing is achieved, extremely high mixing efficiency can be kept under various common transportation flow velocities of a natural gas pipeline, and the working condition adaptability is high.

This invention discloses a tunnel boring machine (TBM) and a device for excavating a tunnel with a quasi-circular arch and straight wall cross-section, as well as a construction method. The device includes a TBM main unit, a rock cutter with a rounded corner, a rear-mounted trailer, a muck removal system, and a cutting machine support system. The TBM main unit is installed at the front of the excavation device, and the cutting machine support system is installed at the rear. The TBM main unit and the cutting machine support system are connected via the rear-mounted trailer. The rock cutter with a rounded corner is mounted on the cutting machine support system and is used to cut the tunnel under the control of the cutting machine support system. The TBM main unit, the cutting machine support system, and the rear-mounted trailer all have muck removal systems installed inside. The construction method includes three processes: excavation, step switching, and muck removal. This invention offers high forming efficiency, a short construction cycle, and more flexible rock cutting capabilities, adapting to rocks of different areas and sizes. Furthermore, the excavation and step switching processes of the TBM main unit and the rock cutter with a rounded corner are independent and do not interfere with each other. The structure is simple and the cost is low.

The invention discloses a semicircular roadway roof deformation control supporting method under the three-soft and half-coal-rock condition, and belongs to the technical field of mine roadway supporting. The method comprises the following steps: carrying out roadway tunneling by adopting a straight-wall semicircular arch-shaped section; immediately implementing temporary support; a high-strength active supporting system is constructed, and horizontal channel steel combined anchor cables are additionally arranged at the base line position of a coal pillar side arch; anchor cable bundles are additionally arranged in the key area at intervals; lagging grouting is conducted on the broken surrounding rock, and a grouting reinforcing ring is formed; and spraying concrete, sealing and arranging a dynamic monitoring system. Through section optimization, active support, surrounding rock modification and dynamic regulation and control integrated cooperative control, the technical problems that the three-soft half coal rock roadway roof is large in deformation and prone to instability are solved, and the method has the advantages of being reliable in support, high in adaptability, good in economical efficiency and the like.

The application belongs to the technical field of tunnel construction, and particularly relates to a tunnel crossing active fault multi-arch anti-fault system. In the tunnel crossing active fault multi-arch anti-fault system, the tunnel assembly is limited by the transverse constraint hinge and cannot displace transversely in the overbreak space, but can only move up and down in the vertical plane of the overbreak space. The multi-arch structure at the bottom of the tunnel assembly comprises a semicircular arch frame and a plurality of sequentially connected circular arch frames. The cooperation of the semicircular arch frame and the circular arch frame can effectively support the tunnel assembly and play a certain buffering role to absorb and dissipate the fault displacement generated when the surrounding rocks on both sides of the active fault relatively displace, so that the actual fault displacement of the tunnel assembly is significantly lower than the actual fault displacement of the surrounding rocks on both sides of the active fault, thereby greatly reducing the influence of the fault displacement of the surrounding rocks on both sides of the active fault on the tunnel assembly and improving the stability and safety of the tunnel assembly.

The present invention provides a method for positioning and constructing a steel anchor box for a circular arch main tower of a cable-stayed bridge, comprising the following steps: S1, measuring the axial alignment and verticality of the main tower and determining the installation time period of the steel anchor box; S2, determining the installation positioning points of the segmental steel anchor box and laying them out; S3, re-measuring the installation positioning points determined in S2 and installing the segmental steel anchor box; S4, determining the cable guide anchor point and the cable guide outlet position point on the segmental steel anchor box, and setting the cable guide outlet IP layout mark point; S5, re-measuring the cable guide outlet IP layout mark point and installing the cable guide pre-embedded section; S6, installing a template on the main tower wall, connecting a cable guide transition connecting steel plate at the end of the cable guide pre-embedded section, and connecting the cable guide rear connecting section to the cable guide transition connecting steel plate; S7, repeating steps S2-S6. The present invention has the effect of improving the existing problems in the installation of steel anchor boxes in the main tower, such as the difficulty in positioning, the inaccurate installation, the box construction period, and the construction cost.

The invention relates to the technical field of coal mining and roadway advance support, and discloses a short-distance coal seam group mining underlying working face advance support process which comprises the following steps: step S01, active reinforcement support: before fully mechanized coal mining face stoping, a curved surface truss structure is adopted to carry out active reinforcement support in an advance pressure influence range of two crossheading; s02, core supporting is conducted, specifically, a curved surface truss structure is adopted for core supporting; s03, roadway supporting is conducted, specifically, the rectangular-section roadway is supported through a first supporting technology, and the straight-wall arc-arch-section roadway is supported through a second supporting technology; and step S04, monitoring and reinforcing mechanism: installing a mining anchor cable stress sensor in the forepoling area. The forepoling process for the underlying working face during mining of the short-distance coal seam group is convenient to operate, low in working intensity and high in working efficiency.

This disclosure relates generally to a payload separation system utilizing a circular arch connective mechanism for connecting and releasing a payload from a launch vehicle. The apparatus of the invention is particularly useful for spacecraft and other vehicular separation mechanisms.

A precast concrete corridor anti-seepage structure and construction method, the anti-seepage structure comprising a corridor formed by a plurality of precast single-frame corridor components spliced in sequence, each precast single-frame corridor component comprising a precast circular arch section and precast straight wall sections connected to the lower ends of both sides of the precast circular arch section; a longitudinal flat joint structure is provided at the joint positions of two adjacent precast single-frame corridor components, the longitudinal flat joint structure comprising longitudinal reserved notches provided on the outside of the joint positions of adjacent precast circular arch sections and adjacent precast straight wall sections, anti-seepage concrete poured on the longitudinal reserved notches, and an anti-seepage layer laid on the outside of the positions of the anti-seepage concrete; a transverse contact structure is provided at the joint position between the precast circular arch section and the precast straight wall section, a vertical drainage pipe is provided inside the precast straight wall section; a longitudinal upper groove and a longitudinal lower groove together form a longitudinal drainage trough, the upper end of the vertical drainage pipe is connected to the longitudinal drainage trough, and the lower end is connected to the drainage ditch in the corridor.

The utility model relates to the technical field of building construction, in particular to a tunnel lining trolley with an adjustable bracket, which comprises a main frame body and a base, and a supporting component and a walking component are arranged on the base. A template component is further arranged on the main frame body, the template component comprises a first template and a second template, a first hydraulic telescopic rod and a plugging block are further arranged below the first template, the face, facing the main body circular arch, of the plugging block is a deformation part, and the deformation part is made of a flexible rubber material; the first hydraulic telescopic rod is used for pushing the plugging block to move towards the main body circular arch, and then the deformation part abuts against the surface of the main body circular arch. According to the flue plate bracket plugging device, the plugging block is pushed by the first hydraulic telescopic rod, so that the deformation part is propped against the surface of the main body circular arch, and the fit clearance between the first template and the main body circular arch can be plugged, so that concrete grout is effectively prevented from leaking from the fit clearance between the first template and the main body circular arch during pouring construction, and the forming quality of a flue plate bracket is ensured.

This invention relates to a water jet tunneling method suitable for five-center circular arch tunnel structures, comprising the following steps: S1. Conducting a pre-experiment of jet cutting in the lower cutting zone of the tunnel face according to the tunnel design; S2. Measuring the cutting depth D under different jet parameters; S3. Determining the cutting parameters based on the cutting depth D, and designing a cutting path diagram based on the cutting parameters; S4. Performing cutting operations on the lower cutting zone according to the cutting path diagram; S5. Performing cutting operations on the upper cutting zone according to the cutting path diagram. This invention enables efficient, precise, safe, and reliable tunneling of five-center circular arch tunnel structures, and can improve construction quality, enhance adaptability, and reduce construction costs.

The utility model discloses a pipeline supporting device for gas engineering backfilling, and aims to solve the problems that in the prior art, when vehicles run above a pipeline and articles are temporarily stacked on the pipeline, direct pressure can be applied to the pipeline, the pipeline can be fatigued, cracks or fractures are further caused, the safety operation of the pipeline is seriously threatened, and the pipeline cannot be damaged. The existing buried gas pipeline protection facility has the problems of single design and insufficient protection efficiency. If the pipelines are damaged, heavy loss can be caused. Comprising a pair of trapezoidal supporting bases which are symmetrically arranged, a semicircular arch pressure relief cover which is detachably erected on the two trapezoidal supporting bases, and two parallel fixed transverse strips which are connected and embedded into the bottoms of the two trapezoidal supporting bases respectively, the pipeline supporting seat is detachably connected to the two fixed transverse strips; and the gas pipeline is fixed to the pipeline supporting seat through a steel wire rope. And the fixed transverse strip and the trapezoidal supporting base are connected to the bottom of the groove.

The invention provides a shaft system structure for a wind generating set and the wind generating set. The shafting structure for the wind generating set comprises an inner shaft, an outer shaft arranged on the outer side of the inner shaft, a first bearing and a second bearing, the first bearing and the second bearing are installed at the first end and the second end of the shafting structure respectively and arranged between the inner shaft and the outer shaft, and the first bearing and the second bearing are arranged in the axial direction of the inner shaft. The outer shaft comprises a first bearing supporting section located at the first end and used for supporting the first bearing, a second bearing supporting section located at the second end and used for supporting the second bearing, and a first connecting section located between the first bearing supporting section and the second bearing supporting section. Each of the outer wall face and the inner wall face of the first connecting section is not provided with an inclined arch but only provided with a circular arch. According to the shafting structure for the wind generating set, the rigidity can be improved.

The application provides a steel structure test section for a nuclear explosion shock wave simulation test system, which comprises, from left to right, a charging test section, a first test section, a first reducing section, a second test section, a second reducing section and a third test section; the first test section, the second test section and the third test section are all straight wall circular arch tubular structures; the right end of the charging test section is connected with the first test section through the first reducing section; the right end of the first test section is connected with the second test section through the second reducing section; and the right end of the second test section is connected with the third reducing section. The application can be combined into different structure states according to test requirements, meets more test requirements, improves energy utilization rate, and the test environment state is consistent with the actual situation of an underground tunnel; the combination of the test section can avoid repeated construction of the whole system, and reduce the test construction cost; the test section can build a test section explosion shock wave stitching technology, and energy density is improved.

The present invention discloses a b-shaped ecological beach protection block, which includes a horizontally placed b-shaped main body. The bottom of the main body is a rectangular bottom plate, and the upper part is a semi-circular arch located on one side of the rectangular bottom plate and extending along the entire width of the rectangular bottom plate. Two transverse tenons are provided on the front side of the rectangular bottom plate, and two transverse mortises corresponding to and adapted to the transverse tenons are provided on the rear side. A longitudinal tenon is provided on the left side of the rectangular bottom plate, and a longitudinal mortise adapted to the longitudinal tenon is provided on the right side. Two holes are provided on the rectangular bottom plate, and the two holes are respectively located inside and outside the semi-circular arch. The present invention also discloses a beach protection structure using the above b-shaped ecological beach protection block. Using the beach protection block disclosed by the present invention to form a river beach protection structure not only has good beach protection engineering effects, but also can fully reflect the ecological and environmental protection values.