72 results about "Contraction joint" patented technology

The invention belongs to the technical field of building terraces, and particularly relates to a paint terrace shrinkage joint repairing device and a repairing method thereof.The repairing method includes the steps that intelligent recognition of crack features is achieved through a multi-modal sensing network, feature fusion is conducted on multi-source data through a convolutional neural network algorithm, structural cracks and surface cracks are automatically distinguished, and a repairing result is obtained. Obtaining a detection map; based on the detection map, comprehensively considering crack parameters, environmental conditions and construction period requirements, and automatically generating an optimal repairing scheme; the self-adaptive mixing system is driven to complete dynamic modulation of the repairing material; high-precision filling operation is executed through the intelligent mechanical arm; a full-periodicity performance evaluation model is constructed through an Internet of Things monitoring terminal, a repairing result is monitored, an intelligent mechanical arm is adopted, a path is re-planned in real time through an RRT algorithm, and Z-shaped layered filling is executed, so that the filling fullness is improved.

The invention relates to the technical field of pavement material mechanical property testing, and discloses a pavement material deformation adaptability fatigue testing machine, which comprises a servo drive and control system, a mechanical transmission system and a structure support and reference system, the servo drive and control system comprises a servo motor, a PLC, a servo driver and an analog quantity output module, the PLC is electrically connected with the analog quantity output module, the analog quantity output module is electrically connected with the servo driver, and the servo driver is electrically connected with the servo motor. The load coverage range is wide, the test requirements of pavement material test pieces with different strengths are met, the requirements of various mechanical property tests on loads are met, the loading modes are flexible and diversified, single loading such as horizontal stretching, stretching containing vertical deformation and fatigue stretching circulation can be achieved, and the test efficiency is improved. The device can be combined with MMLS3 small acceleration loading equipment to realize composite loading of tire cyclic load and test piece deformation, and composite working conditions of the seamless expansion joint in actual service are accurately simulated.

The application provides a telescopic joint device for energy-saving glass of curtain wall, and relates to the technical field of building, which comprises an outer frame structure, a horizontal clamping groove seat, a buffer device one, a corner telescopic joint mechanism, a vertical clamping groove seat and a buffer device two. The application has the characteristics of reasonable and simple structure, low production cost, convenient installation and complete functions. The outer frame structure is stably connected through a specific connecting structure, can provide stable support for the whole device, and guarantees the reliability of the device base frame. The elastic effect of the buffer device can effectively buffer the force generated when the curtain wall expands and contracts, and the limiting structure can guarantee the stability of the buffering process, improving the buffering effect and service life of the device. The telescopic joint mechanism arranged at the corner position can adapt to the complex expansion and deformation at the corner through the synergistic effect of the buffer connecting mechanism and the connecting device, avoid stress concentration, and ensure the safety of the corner position.

This invention discloses a waterproof structure and its construction method for building engineering, relating to the field of waterproofing technology for expansion joints in building engineering. The invention includes an elastic shell, with a transmission structure symmetrically and uniformly arranged around its center point within the inner cavity of the elastic shell. A connecting structure is slidably connected to the outer surface of the transmission structure, and splicing structures are symmetrically arranged on both sides of the connecting structure. A sliding snap-fit ​​structure is fixedly connected to the lower part of the outer surface of the elastic shell. A sealing shell is snap-fitted to one side of the elastic shell via the splicing structure. Through the snap-fit ​​structure and sliding ball bearing assembly, the sliding friction between the sliding frame and the snap-fit ​​block is converted into rolling friction, significantly reducing the splicing sliding resistance, decreasing the difficulty and intensity of manual assembly, and making the sliding assembly of the elastic shell and its inner cavity components smoother and more precise. This effectively improves the splicing efficiency of the waterproof structure. Through the snap-fit ​​cooperation between the connecting pin and the positioning groove of the transmission frame, rapid and precise docking of each section of the waterproof structure is achieved, ensuring the integrity and regularity of the overall structure.

The utility model discloses a profiled steel plate and concrete outer wall high low span position expansion joint anti -permeation node, including profiled steel plate outer wall, it sets at the topmost, fixed steel sheet, fixed steel sheet and profiled steel plate outer wall fixed connection, and fixed steel sheet includes first upper U shape part, first lower U shape part and first vertical part, and the lower side of fixed steel sheet is connected with the adjusting steel sheet, and the reinforcing steel plate is rectangular, and the connecting steel plate is arranged between the reinforcing steel plate and the adjusting steel plate, and the lower side of reinforcing steel plate is fixedly connected with the concrete parapet. The utility model discloses through the first lower U shape part of fixed steel sheet and the second upper U shape part of adjusting steel sheet and connects the joint, forms the non - rigid connection structure, effectively absorbs building settlement and temperature deformation stress, solves the joint cracking leakage problem caused by traditional rigid fixed.

This invention provides a system and construction method for treating arching defects in the pavement of operating tunnels located in underlying karst strata. The tunnel lining is pre-reinforced by installing an arc-shaped I-beam internal support frame. The height and tension of the I-beam internal support frame are adjusted using longitudinal steel beams. After pre-reinforcement, the concrete pavement layer and the underlying broken rock layer are excavated, and the middle section of the tunnel invert is poured. The surrounding rock pressure is transferred to the middle invert via the supporting steel frame. The surrounding rock at the arch foot is then excavated, and concrete is poured to form a closed structure, transferring the tunnel's surrounding rock pressure to the invert. After the closed invert is constructed, the concrete lining is reinforced using a combination of "W-shaped steel strip + anchor grouting + sprayed steel fiber concrete" to solve problems such as cracking, heave, deformation, and voiding in the operating tunnel. Grooves are cut at the transverse expansion joints where water seepage occurs, and channel steel is pre-embedded in the grooves as a water guiding channel to promptly drain seepage water from the pavement into the drainage ditches on both sides.

The utility model discloses a kind of seamless expansion joint drainage structures, solve the problem of water seepage falling and setting instability in prior art seamless expansion joint structure, expansion joint sets up drainage conduit and accesses bridge drainage main pipe to form expansion joint drainage structure system, with beneficial effect, specific scheme is as follows:a kind of seamless expansion joint drainage structure, including the end side concrete piece located at the length direction end side of each bridge beam body, end side concrete piece is bonded with bridge beam body, nut seat is set in end side concrete piece, nut seat is set along the width direction of bridge beam body, end side concrete piece on the both sides of expansion joint supports waterstop, waterstop is communicated with bridge drainage main pipe by water guide pipe, elastic expansion component straddles expansion joint and its both sides are respectively placed on the upper surface of corresponding side end side concrete piece, elastic expansion component respectively press sets the both sides of waterstop at corresponding side end side concrete piece, first fastener detachably connects elastic expansion component and nut seat, elastic sealing layer is laid between elastic expansion component and bridge deck pavement layer.

The utility model relates to the technical field of bridge expansion joints, and discloses a vibration reduction type bridge expansion joint device which comprises a concrete bridge deck slab, asphalt pavement layers and a filling layer, the asphalt pavement layers and the filling layer are arranged on the concrete bridge deck slab, and the filling layer is arranged between the asphalt pavement layers. A filling layer is arranged on the concrete bridge deck slab, high-strength resin concrete is arranged in the filling layer, an expansion joint gap is formed in the butt joint position of the concrete bridge deck slab, a joint crossing plate is arranged on the expansion joint gap, an extruded sheet is arranged on the joint crossing plate, and the extruded sheet divides the high-strength resin concrete into two sections. The device has the advantages of simple structure, high construction efficiency and long-acting durability.

The invention discloses a mounting structure and a mounting method of a concrete-free low-noise telescopic device, and belongs to the field of bridge expansion joints, the mounting structure comprises a telescopic groove, an L-shaped embedded steel plate is mounted in the telescopic groove, the mounting structure further comprises a pre-assembly part, the pre-assembly part comprises a leveling plate and two symmetrically-arranged telescopic parts, and the leveling plate is connected with the two telescopic parts. The two telescopic pieces are both detachably connected with the leveling plate, the space between the two telescopic pieces is further filled with noise reduction filler, by improving the mounting structure and the mounting method, the relative position of the two comb plates is more accurate, noise is reduced, and the problems that in the prior art, deviation is likely to be generated between the relative position of the bridge expansion joint comb plates and a design value, and noise is reduced are solved. And noise is easy to generate.

The present application relates to a kind of in-service large-span continuous box girder spanning type wide connection structure and its construction method.The structure includes: connecting main piece, including several groove pieces, top plate and several solid blocks;And connecting secondary piece, including several wedge-shaped solid blocks, and box type piece matched with another end of several wedge-shaped solid blocks;When existing old bridge and wide new bridge occur displacement or produce deflection difference, the connecting main piece occurs vertical rotation along the center axis of spherical hinge, wedge-shaped solid block and connecting main piece occur relative displacement, so that connecting main piece and connecting secondary piece occur limited displacement.The construction method includes the following steps: installing new bridge pavement, old bridge pavement;Install support;Assemble connecting main piece, connecting secondary piece and respectively install in wide new bridge and existing old bridge.Compared with prior art, the present application eliminates the problem of traditional expansion joint that may exist at the joint position, improves the comfort of vehicle driving.

The utility model relates to a device for controlling the thickness of virtual laying of cement soil, which belongs to the technical field of road laying and comprises a base, a vertical rod, a graduated scale, an indicating rod and a clamping mechanism. The vertical rod is vertically fixed on the base, a mounting groove is formed in the vertical rod in the vertical direction, and a graduated scale is arranged in the mounting groove; the indicating rod is provided with a limiting hole matched with the vertical rod, the indicating rod is provided with a contraction joint which enables the limiting hole to be communicated with the outside, and the side wall of the contraction joint is provided with a locking hole. The clamping mechanism comprises a locking rod, a cam and a deflector rod, the locking rod is slidably sleeved with the locking hole, one end of the locking rod is fixedly connected with a first limiting block, the other end of the locking rod is hinged to the cam, and the deflector rod is fixedly connected to the cam. The utility model effectively solves the problems that the existing device for controlling the false laying thickness of the cement soil rubs the scales on the scale rod when the indicating rod is adjusted in a sliding manner, so that the scales are lost and become fuzzy, the position adjustment of the indicating rod generates an error, and the construction quality is influenced.

The present application relates to a kind of highway reconstruction and expansion half-width alternate traffic quick replacement bridge expansion joint construction method, comprising the following steps: cutting joint on the both sides of original expansion joint structure is constructed;Original expansion joint structure is removed;Installation pouring formwork system;Setting up temporary installation stable hanger, hoist new expansion joint structure;Pouring steel fiber concrete at the end of main beam.The beneficial effects of the present application are: the strip-shaped protective box wraps the cutting operation surface therein, and delivers cooling water through the water inlet hole, and the water outlet hole extracts the sewage containing dust, so as to avoid dust pollution generated by cutting operation, and the structure is simple and reliable, can be completed by modifying existing cutting mechanical equipment, and the construction cost is lower;New expansion joint structure can be assembled in place first, and then hoisted to the installation position by temporary stable hanger, which can effectively improve the on-site operation efficiency compared with step-by-step installation, and ensure the installation positioning accuracy.

The application relates to the technical field of traffic pavements, in particular to a bridge deck buffer expansion joint device and a construction method, which comprises a sliding layer arranged at the bottom between two bridge decks, an elastic glue arranged above the sliding layer, concrete blocks and a middle beam arranged above the elastic glue in sequence, embedded steel bars and anchoring steel bars arranged on the left and right sides of the concrete blocks respectively, side beams arranged on the left and right of the middle beam, a sealing water stop belt arranged between the side beams and the middle beam, one end of the sealing water stop belt connected with the side beam, the other end of the sealing water stop belt connected with the middle beam, and the anchoring steel bars welded and fixed with the side beams. The damping device, the elastic glue material and the damping pad and other components are used in the expansion joint, the structural vibration amplitude is effectively reduced, the stability of the bridge is improved, the structural vibration caused by the wind load and the vehicles is reduced, and the safety of the bridge is improved.

The application discloses a kind of bridge expansion joint position bumping phenomenon's quick handling construction method. Including step 1) measuring elevation: the elevation of the steel of bridge expansion joint two sides and the elevation of two sides asphalt surface are measured respectively, and the repair height of anchoring area is calculated;Step 2) base cleaning: the surface of the anchoring area (2) to be repaired is polished and cleaned;Step 3) formwork is set on the two sides of expansion joint, and movable angle steel is installed according to the repair height obtained in step 1);Step 4) deploy fast hard mortar;Step 5) the mortar is smoothed on the surface of the anchoring area (2) to be repaired, and is cured;Step 6) remove formwork;Step 7) restore traffic.The application not only can improve the bumping phenomenon on the two sides of expansion joint, improve driving safety and comfort, but also can repair the local damaged concrete of expansion joint anchoring area, prolong the service life of expansion joint.

The application discloses a bare concrete prefabricated bridge expansion joint device, which comprises a left structure and a right structure, wherein the left structure and the right structure are the same in structure and are mirror image arranged, box top plates and box bottom plates are oppositely arranged on the left structure, a box rear plate connected with the box bottom plate is arranged on one side of the box top plate away from the right structure, a side beam steel connected with the box top plate is arranged on the upper portion of the other side, a box front plate connected with the box bottom plate is arranged on the lower portion, and a reinforcing rib and a special-shaped rib are arranged in the left structure. The reinforcing rib and the special-shaped rib can ensure the strength of the bridge expansion joint, the structure is simple, firm and durable, the thermal expansion and cold contraction deformation of the highway bridge caused by the change of the environmental temperature can be solved, and the application is widely used in various highway bridges.

This invention discloses a seamless expansion joint compound suitable for medium expansion and contraction and its preparation method, comprising 22-28 parts polyurethane and 100 parts aggregate and rubber particles. By adjusting the proportion of rubber particles, it can accommodate seamless expansion joints with medium expansion and contraction of 50mm-80mm and tensile deformation rate of 5%-8%. In this invention, polyurethane provides excellent elastic recovery and adhesion, rubber particles contribute high toughness and damping properties, and aggregates of specific particle sizes provide skeletal support and compressive strength. The three components work synergistically, enabling the compound to flexibly absorb stress and prevent cracking under medium expansion and contraction, while rigidly resisting traffic loads and preventing rutting and permanent deformation. By adjusting the proportions of the three components, the elastic modulus of the seamless expansion joint compound can be precisely controlled, placing it between that of highly elastic pure polyurethane and rigid cement-based materials, thereby achieving better modulus matching with adjacent pavement structures, reducing stress concentration at joints, and extending service life.

The invention discloses a stone arch bridge main arch ring rib type cover arch reinforcing method, relates to the related field of stone arch bridge reinforcing and reconstruction, and aims at improving the bearing capacity of a bridge and enhancing the safety and durability of the bridge through a comprehensive reinforcing system combining main arch ring arch foot local increased section reinforcing, web arch cover arch reinforcing, carbon fiber grid reinforcing and bridge floor system reconstruction. The durability of the structure is improved. The reinforcing method comprises the following steps that S1, section increasing reinforcing treatment is conducted on the arch feet of the main arch ring locally; s2, a web arch close to the pier is reinforced by adopting a cover arch method; s3, other web arch rings are reinforced by adopting a carbon fiber grid hanging treatment method; s4, reinforcing the web arch ring of the bridge abutment by adopting a carbon fiber grid hanging treatment method; s5, the bridge deck pavement above the plane where the bottom face of the original guardrail outrigger is located is chiseled away; and S6, bridge deck pavement and rebuilding, bridge deck guardrail replacement and expansion joint addition.

A concrete expansion joint insert includes a body having a length between a first end and a second end, a thickness between a first side and a second side, and a height between a first edge and a second edge. The body includes a first portion having the thickness, the length, and a first amount of the height. The body includes a second portion having the thickness, the length and a second amount of the height. The first portion of the body is predisposed to be separable from the second portion of the body. A separation support member is situated within the first portion along a substantial portion of the length.

The application discloses a processing method for a comb tooth type expansion joint jointing position in bridge overlay, and comprises the following steps: (S1) milling a milling jointing road section on the surface of a bridge deck pavement structure layer on both sides of the comb tooth type expansion joint, including a bonding material overlay area and an asphalt concrete overlay area; (S2) performing asphalt concrete overlay on the asphalt material overlay area and the bridge deck pavement structure layer to form a general overlay road section; (S3) finely cutting the interface between the asphalt concrete overlay area and the bonding material overlay area; (S4) adding bonding material in the bonding material overlay area, and the bonding material can be compacted by a field construction machine. The method uses newly developed bonding material to replace asphalt concrete material, solves the problems that the comb tooth type expansion joint jointing position is prone to edge biting and has poor durability when using asphalt concrete, avoids secondary excavation treatment of the bridge expansion joint, reduces the influence on traffic during construction, and has simple process and low cost.

The utility model discloses a direct-touch type ground splicing structure, and relates to the field of ground stone installation, the direct-touch type ground splicing structure comprises a fine aggregate concrete layer, a thick daub bonding layer and stone plates which are sequentially laid on a reinforced concrete floor layer from bottom to top, and expansion joint strips are arranged between the stone plates; an expansion joint strip is arranged on the surface of the stone plate, an auxiliary assembly used for auxiliary positioning is arranged outside the expansion joint strip, an arc groove is formed in one side of the surface of the stone plate, and arc plates matched with the arc groove are fixedly connected to the two sides of the expansion joint strip correspondingly. When the supporting plate is located in the positioning piece, the supporting plate is opened through the elastic force of the torsional spring and abuts against the inner wall of the positioning piece, the expansion joint strip is clamped, the position of the expansion joint strip is more stable, and position deviation caused after the expansion joint strip is impacted can be prevented.

The utility model belongs to the field of bridges, and particularly relates to a bridge expansion joint structure which comprises a first supporting plate and a second supporting plate which are oppositely arranged, a gap is arranged between the first supporting plate and the second supporting plate, a first vertical partition plate is arranged below the first supporting plate, and a second vertical partition plate is arranged below the second supporting plate. A first protruding strip is arranged above the first supporting plate, a second protruding strip is arranged above the second supporting plate, and an L-shaped folding connecting plate is arranged between the first protruding strip and the second protruding strip. The L-shaped folding connecting plates are arranged on the interval gaps, so that the reliability of the structure is guaranteed, and even if thermal expansion and cold contraction occur, absorption can be conducted through the L-shaped folding connecting plates.

The utility model discloses a concrete wall crack shrinkage plugging device, which relates to the technical field of crack plugging and comprises an X-axis shrinkage mechanism, two ends of the X-axis shrinkage mechanism are fixedly connected with Y-axis shrinkage mechanisms, the surface of the X-axis shrinkage mechanism is provided with a Z-axis shrinkage mechanism, the X-axis shrinkage mechanism comprises an X-axis shrinkage piece, and the X-axis shrinkage piece is provided with a Z-axis shrinkage mechanism. The two ends of the X-axis contraction piece are fixedly connected with first assembling pieces, one side of the X-axis contraction piece is fixedly connected with a first rotating piece, and the surface of the first rotating piece is rotationally connected with a first fastening piece. Through the arrangement of the Y-axis contraction mechanism, when contraction joint filling is carried out on a concrete wall, the second fastening piece is rotated to enable the Y-axis contraction piece to contract, pressure in the Y-axis direction is applied to the building wall, and meanwhile the X-axis contraction mechanism and the Z-axis contraction mechanism are matched, so that the device has three-direction contraction force; therefore, the paint can adapt to wall cracks in different cracking directions, and is higher in applicability.

The present application relates to the technical field of slope stability, and particularly relates to a contraction joint cutting device for channel slope protection technology and a construction method thereof, which reflects concrete strength fluctuation according to a feed speed difference value and a cutting pressure, adjusts a cutting depth and an initial rotating speed according to the feed speed difference value; determines whether the channel slope protection has a concave-convex surface according to changes in the feed pressure and actual rotating speed; determines a concave-convex surface type according to a current feed pressure and a historical feed pressure, and adjusts the cutting depth according to the concave-convex surface type; determines whether a joint slot edge produces edge collapse according to an extracted curvature radius of the joint slot; determines whether the joint slot of the contraction joint is in channel slope protection convex surface edge collapse according to an initial detection period, determines whether the moving speed and the rotating speed of the cutting device are matched, and reduces the initial moving speed or the initial detection period of the cutting device. The present application enhances the anti-deformation ability and stability of the channel slope protection structure through accurate cutting of the contraction joint, and prevents slope landslide or frost heaving damage.

This invention discloses a rapid concrete cutting device for road and bridge expansion joints, relating to the field of concrete cutting technology. The technical solution includes a base plate, two housings, a rotating shaft, a vertical plate, a position adjustment component, and a cutting component. The two housings are fixedly connected to the top of the base plate, the rotating shaft is rotatably connected to the two housings, the vertical plate is fixedly connected to the top of the base plate, the position adjustment component is connected between the vertical plate and the rotating shaft, and the cutting component is connected to the position adjustment component. The beneficial effects of this invention are: by setting up a limiting component including a limiting slider and a locking element, when the cutting component encounters a hard material and generates a reaction force causing a reversal tendency, the trigger element contacts the locked limiting slider, restricting the upward movement of the limiting slider, thereby rigidly blocking the transmission of the reversing torque and preventing the reaction force from directly acting on the hydraulic system of the position adjustment component, effectively preventing damage to the driving component from rigid impact.

The invention relates to the technical field of highway bridge construction materials, and discloses a water-based reduced asphalt ultrathin wear-resistant layer material and a construction method, and the water-based reduced asphalt ultrathin wear-resistant layer material is applied to an anti-cracking batten seam surface layer part at the rear part of an expansion joint device; the concrete comprises the following components in parts by weight: 60-65 parts of cement, 20-30 parts of high-performance water-based reduced asphalt, 2-5 parts of fibers, 10-20 parts of coarse aggregate, 10-20 parts of fine aggregate and 5-10 parts of filler. The water-based reduced asphalt ultrathin wear-resistant layer material disclosed by the invention is filled in a strip seam around an anti-cracking plate, so that the flexibility of the material is improved, and pit seams formed by separation from a steel plate are avoided.

The present invention discloses a novel method and device for processing expansion joints between columns, which is used for pouring at least two adjacent concrete columns, and includes: a plurality of steel molds, which are tightly arranged around the outside of the steel skeleton of the concrete column to be poured; a partition, which is arranged between two adjacent steel skeletons; a fixing assembly, which is used to fix the steel molds and the partitions and form a pouring space that is closed on all sides between the steel molds and the partitions. The present invention arranges partitions in the preset expansion gaps between the concrete columns, and then uses the fixing assembly to fasten the same partition to multiple steel molds around the outside of the steel skeleton, thereby enclosing a pouring space. At this time, under the mutual positioning effect of the steel skeleton and the steel mold, concrete is poured into the pouring space, which ensures that the positioning of the steel molds and the partitions is not affected, deformation is not likely to occur, and the size of the expansion joints between the columns is better reduced, reducing space waste.

The utility model provides a matching type expansion joint structure which at least comprises a first concrete plate and a second concrete plate which are adjacently arranged, a connecting assembly is arranged between the first concrete plate and the second concrete plate, and the connecting assembly comprises a corner protection assembly, a shear-resistant anchoring assembly and a force transmission assembly. The corner protection assembly is used for protecting contact corners of the first concrete plate and the second concrete plate; when the first concrete plate and the second concrete plate contract, the corner protection assemblies are fixed to the first concrete plate and the second concrete plate respectively after being separated, and an expansion joint is formed between the first concrete plate and the second concrete plate. The expansion joint structure is easy to install, the corner protection assembly is anchored in the concrete plate through the shear-resistant anchoring assembly, the fragile edge of the expansion joint of the concrete plate is protected, and the expansion joint structure has the remarkable advantages of internal stress release and load transmission of the concrete plate.

A concrete surface beautification and / or restoration method enables the use, or incorporation, of cracks in the surface of an existing or newly formed concrete slab as part of the beautification / restoration process. Initially, temporary marking lines are imparted in an artistic manner upon an upper surface of the concrete, intentionally extending from ends of, or otherwise intersecting with, the existing cracks and optionally existing concrete surface expansion joints and relief cuts, to subsequently create an aesthetically-pleasing natural random surface pattern, such as a natural stone appearance. Specialized chipping hammer bits may be employed to cut, chip and / or route along both the existing cracks and the temporary marking lines to create an even, generally uniform carved visual appearance (e.g., replicating the look of a natural stone surface).

The utility model discloses a concrete expansion joint soft cutting device which comprises a trunk canal left side plate and a trunk canal right side plate, transverse plates are fixedly connected above the trunk canal left side plate and the trunk canal right side plate, an upper blocking plate is fixedly welded between the two transverse plates, and a rib plate is fixedly welded in a gap area between the trunk canal left side plate and the trunk canal right side plate. The trunk canal left side plate and the trunk canal right side plate are matched with the evenly-distributed rib plates to form a complete stress whole, and the structural strength and the deformation resistance are improved; the conical embedded end and the main body are integrally formed, the production process is simplified, and stable connection of the device and a pouring base layer is ensured.

The utility model provides a positioning seam-reserving leveling device for improving the paving quality of marble, which comprises a positioning pin which comprises a holding part positioned at the top end, a threaded section positioned at the middle section, a positioning section positioned at the lower end and a limiting rod positioned at the bottom end from top to bottom; the adjusting ring is arranged on the peripheral side of the threaded section in a sleeving manner through threads; wherein; the limiting rod is horizontally arranged, and the limiting rod and the positioning section are distributed in an inverted T shape; the diameter of the limiting rod is smaller than the width of a marble reserved gap; the diameter of the positioning section is matched with the width of the marble reserved gap; the lower surface of the adjusting ring is horizontal, and the diameter of the adjusting ring is larger than the width of the marble reserved gap. According to the utility model, a 2mm expansion joint is accurately reserved, and the marble paving quality is improved.