50 results about "Segregation in concrete" patented technology

The utility model discloses a concrete conveying pipeline capable of preventing segregation, and relates to the technical field of concrete transportation. The concrete conveying pipeline capable of preventing segregation comprises a pipe body, the pipe body is laid on the ground through a damping support, the pipe body comprises an inner pipe and an outer pipe, the inner pipe is embedded in the outer pipe, positioning plates are installed between the inner pipe and the outer pipe in a supporting mode, and liquid bins are formed between the adjacent positioning plates. The surface of the pipe body is further wrapped with a pipe sleeve, and the pipe sleeve is fixed through a damping support. In order to overcome the defect that concrete is prone to segregation due to environmental influence when conveyed by a pipeline, hot water or cooling liquid can be added into the liquid bin according to the environmental temperature, the proper temperature of the concrete in the pipeline is kept, and the problem of concrete segregation caused by high temperature or low temperature is avoided.

The utility model discloses large-flow concrete segregation rate test equipment, which comprises a rack, a sieve shaker and a jumping table, the rack comprises a base, a sliding trolley and a lead screw lifting mechanism, the sieve shaker and the jumping table are respectively arranged on the base, the sliding trolley is arranged in a track of the base, the lead screw lifting mechanism is arranged on the sliding trolley, a clamping mechanism is arranged on the lead screw lifting mechanism, and the jumping table is arranged on the clamping mechanism. The jumping table is provided with a detection cylinder, the detection cylinder comprises a plurality of stacked cylinder bodies, the clamping mechanism is used for clamping the cylinder bodies, the cylinder bodies are provided with driving devices and turning plate assemblies, the turning plate assemblies are located in the cylinder bodies, the driving devices are located outside the cylinder bodies, and the driving devices are connected with the turning plate assemblies. When a concrete sample is screened, each section of the cylinder body of the detection cylinder can be automatically closed by virtue of the turning plate assembly, so that the screw rod lifting mechanism can conveniently move the cylinder body to the vibration screening machine through the clamping mechanism, and in the process, the turning plate assembly can prevent the concrete sample from leaking from the cylinder body.

The invention relates to the technical field of concrete construction, and discloses a pouring construction method for a pipe jacking construction working well, which comprises a bottom plate, a motor is arranged in the middle of the upper surface of the bottom plate, a threaded rod is fixedly arranged at the output end of the motor, and a plurality of fixing rods are in threaded connection with the bottom end of the outer wall of the threaded rod. A scraping block is arranged at one end of the fixing rod, a first spring is arranged on the upper surface of the fixing rod, a buffer block is arranged at the top end of the first spring, a rotating shaft is arranged at one end of the buffer block, and supporting blocks are rotationally connected to the two ends of the rotating shaft. Concrete segregation is avoided through cooperation of the buffer blocks and the springs, and the pouring quality and structural strength of the working well are improved; after pouring, the motor drives the scraping block to clean the groove dividing barrel, manual cleaning difficulty is lowered, and the service life of the device is prolonged; and a stable structure and a buffering and cleaning mechanism reduce potential safety hazards and guarantee the safety of personnel and equipment. The problems of concrete segregation and difficult device cleaning are solved.

A discharging pipeline unit and a wellhead mixing station concrete discharging system comprise a plurality of connecting pipes in butt joint, and further comprise a collecting hopper, an elbow and a hose, the collecting hopper is installed at the upper end of the connecting pipe located at the uppermost end, the elbow is installed at the lower end of the connecting pipe located at the lowermost end, and the hose is in butt joint with the elbow; and at least one connecting pipe is provided with a bending part. The bending part is arranged on the connecting pipe, and the elbow is arranged at the lower end of the connecting pipe at the lowermost end, so that the falling resistance of concrete is increased, the falling speed of the concrete is slowed down, and concrete segregation caused by free falling of the concrete in the longitudinal connecting pipe can be prevented.

The invention discloses an anti-segregation device for a discharge port of an airport pavement concrete mixing station in an alpine plateau region, and relates to the technical field of concrete.The anti-segregation device is characterized in that a spiral discharge rod is rotationally connected into a conveying cylinder, an opening is formed in the side wall of one end of the conveying cylinder and communicated with a communicating bin, and a discharge port is formed in the side wall of the other end of the conveying cylinder and provided with a discharge vibration frame; the discharging vibration frame is connected with the conveying cylinder through a vibration assembly, a partition is arranged on the discharging vibration frame, a heat preservation layer is arranged on the outer side of the conveying cylinder, and heating wires are arranged in the heat preservation layer on the outer side of the conveying cylinder and the partition. Concrete can be stirred to a certain degree through rotation of a spiral discharging rod, the probability of segregation is reduced, heating wires are arranged in a heat preservation layer and a partition on the outer side of a conveying cylinder, the temperature of the concrete can be increased, the influence of plateau cold and cold on concrete segregation is avoided, a discharging vibration frame is arranged at a discharging port, and the discharging vibration frame is connected through a vibration assembly and vibrates, so that the concrete segregation probability is reduced. The aggregate is mixed with water, so that the possibility of segregation is reduced.

The invention provides a mid-partition wall pouring method, which belongs to the technical field of tunnel construction, and comprises the following steps of: binding reinforcing steel bars and positioning a trolley: taking a concrete pouring beam reserved at a vault position during secondary lining construction as a reference to assist in positioning a trolley template, and binding and lapping the reinforcing steel bars entering a site according to design requirements; erecting a trolley template; the pump pipe is connected to the pouring window at the rearmost end of the first layer, when the liquid level of the concrete rises to 250-300 mm away from the current pouring window, pouring is paused, the pump pipe is switched to the previous pouring window of the current pouring window of the same layer, and pouring continues; after the pouring window is switched every time, the just-completed pouring area is vibrated immediately, the window is closed, and first-layer pouring is completed; the process is repeated to complete layered pouring in sequence; and sealing and pouring the top. The problems that in the pouring process, concrete disintegration and bleeding are likely to occur, cold joints and bubbles are difficult to discharge, and trolley positioning is difficult during secondary lining construction can be solved.

The invention discloses a belt conveyor tunnel narrow-body dense-rib high-body wall double-pipe anti-segregation pouring device and method.The belt conveyor tunnel narrow-body dense-rib high-body wall double-pipe anti-segregation pouring device comprises a double-pipe sectional type material distribution module, an equal-distance pre-buried type guide module, a flow control module and an anti-disturbance auxiliary assembly, and a material distribution pipe of the double-pipe sectional type material distribution module is formed by detachably connecting a plurality of pipe sections; a casing pipe of the equidistant pre-embedded guide module provides an underneath passing channel for the material distribution pipe, the flow control module can independently adjust the concrete flow of the material distribution pipe, and the anti-disturbance auxiliary assembly limits transverse swing of the material distribution pipe. The technical effects that concrete segregation is effectively prevented, the pouring quality and efficiency are improved, and construction safety and convenience are ensured are achieved.

The present application relates to concrete conveying technical field, especially to a kind of concrete self-slip conveying slow descending device design method, comprising: obtaining the real coarse aggregate sample of concrete to be conveyed and concrete mix proportion;Numerical modeling: the physical modeling of different types of slow descending device is carried out to obtain slow descending device numerical model;Based on the real coarse aggregate sample, construct coarse aggregate numerical model;Parameter calibration: the contact mechanics characteristic parameters between coarse aggregate, mortar particle and steel pipe wall are calibrated using physical experiment and numerical simulation combined calibration method;Slow descending device design: based on the contact mechanics characteristic parameters obtained by calibration and actual construction demand, the type of slow descending device is selected, and the parameters of slow descending device are determined, and the design of slow descending device is completed.The present application determines the best slow descending device type of concrete to be conveyed by comparing and analyzing the efficiency difference of different types of slow descending device, so as to adapt to the concrete conveying operation of hundred-meter high-fall condition, effectively control the balance of concrete segregation and pipe wall wear.

This utility model relates to an anti-segregation device for concrete pouring of foundation beam pile heads in highway engineering. The device comprises reinforcing bars I and II, inclined steel plates, and retaining steel plates I, II, and III. The inclined steel plates form a 45-degree angle with the horizontal plane, and their lower edges are arc-shaped discharge ports. The side of the inclined steel plate opposite the arc-shaped discharge port is connected to the bottom of retaining steel plate III along its width direction. The inclined steel plates are connected to the bottoms of retaining steel plates I and II along their length direction. One end of retaining steel plate III is connected to retaining steel plate I, and the other end is connected to retaining steel plate II. The edges of the arc-shaped discharge port are welded to reinforcing bars I and II one-to-one, and these reinforcing bars I and II are connected to the lower edges of the inclined steel plates at a 135-degree angle. This utility model has a simple composition, is easy to install, saves time and labor, and can prevent concrete segregation during foundation beam pile head pouring, ensuring the quality of foundation beam concrete pouring.

The utility model provides a device for slope concrete paving, including upper plane and lower plane, it is inclined panel between upper plane and lower plane, is equipped with the material collecting box, two first winches and two second winches on the upper plane, is equipped with the material removal car on one side of material collecting box, is equipped with the hopper on material collecting box, is equipped with the sliding paver on inclined panel, is equipped with the second receiving hopper of intercommunication in paver both ends. The whole structure transports concrete through the material removal car, can avoid the phenomenon of concrete segregation and chute blockage caused by chute transportation, also avoid the phenomenon of increasing equipment maintenance cost caused by the need of regular replacement or repair due to long -term use chute wear and deformation, have greater popularization value.

The application discloses an anti-segregation agent, a preparation method and application, and relates to the technical field of concrete admixtures. The anti-segregation agent comprises a dispersing agent, a thickening agent and a preservative. The dispersing agent comprises a copolymer obtained by reacting monomers under the action of an initiator. The monomers comprise unsaturated carboxylic acid monomers and first monomers. The first monomers comprise at least one of sulfonic acid monomers, organic silicon monomers, aromatic monomers and phosphate ester monomers. The anti-segregation agent has a wider adaptation range for concrete aggregates, a larger upper and lower limit range for the segregation state of concrete, a stronger adjustment capacity for concrete mixtures, a more flexible adding and using mode, and a lower production cost.

The invention discloses assembly type concrete structure convenient filling equipment, and belongs to the field of concrete filling. Crawler systems are symmetrically arranged at the bottom of the transfer bin; a feeding hole is formed in the top end of the transfer bin; a mounting opening is formed in the bottom wall of the transfer bin, a supporting plate is rotationally embedded in the mounting opening, discharging openings penetrating through the supporting plate are uniformly formed in the supporting plate, the discharging openings are obliquely formed, and a driving mechanism used for driving the supporting plate to rotate is arranged in the transfer bin; due to the fact that the multiple discharging openings are evenly formed in the surface of the supporting plate, the output power of the cement pump truck can be improved, the speed of inputting concrete into the transfer bin can be increased, large-area simultaneous filling can be achieved under the action of the discharging openings, the paving efficiency is improved, the moving frequency of the transfer bin is reduced, and the filling time is shortened; and the probability of concrete disintegration is reduced, the effect of improving efficiency is achieved, and in the rotating process of the supporting plate, horizontal power can be provided for concrete discharged out of the discharging opening.

This invention relates to a flexible tremie pipe for preventing segregation in concrete pouring, comprising at least two vertically connected tremie pipe units. Each tremie pipe unit includes a pipe body and a flange. The pipe body is a funnel-shaped structure made of flexible rubber material, with a circular upper cross-section and a flattened lower section. The inner walls on opposite sides are fitted together. The top opening has an outwardly folded annular flange of a certain width. The flange includes an upper flange and a lower flange. The upper flange presses against the top surface of the flange on the pipe body, and the lower flange fits onto the pipe body and is close to the bottom surface of the flange. The upper and lower flanges are connected by bolts, clamping and fixing the flange. The flanges of the upper and lower tremie pipe units are connected by rigging or a lifting rod. This invention allows concrete to flow in a constrained state, preventing segregation.

The invention belongs to the technical field of concrete vibrating equipment, particularly relates to a vibrating device for iron tailing concrete, and aims to solve the problem that an existing vibrating device for the iron tailing concrete cannot effectively control the vibrating quality. The lower bracket is located below the upper staddle, four symmetrical supporting rods are fixedly connected to the side, opposite to the lower bracket, of the upper staddle, and a plurality of symmetrical hoisting frames are fixedly connected to the upper side of the upper staddle. According to the vibrating device for the iron tailing concrete disclosed by the invention, the uniformity of the vibration amplitude of the vibrating rod head in the concrete can be monitored when the vibrating rod head vibrates the concrete, and the vibrating rod head is pulled out from the concrete when the vibration amplitude is uniform, so that the uncertainty of manual operation is effectively avoided; concrete segregation caused by excessive vibration or concrete honeycombs and pitted surfaces caused by insufficient vibration are avoided, the forming quality of the concrete is guaranteed, and the building quality is improved.

The utility model belongs to the technical field of building construction, and particularly relates to a high formwork frame column limb type liftable guide pipe which comprises a first fixing frame, an electric hoist and two guide pipe bodies, and the electric hoist is fixedly installed on the top of the inner wall of the first fixing frame. The two fixing blocks are fixedly connected to the exteriors of the two catheter main bodies in a sleeving mode correspondingly; the connecting assembly is arranged outside the two catheter main bodies and is used for connecting the two catheter main bodies; and the four moving assemblies are arranged on the two sides of the two fixing blocks correspondingly and used for driving the eight connecting plates to move, through the arranged structure, spatial movement and modular splicing of the guide pipe body can be achieved, meanwhile, it is ensured that the guide pipe body is accurately centered and stabilized in the high-formwork frame column, and the guide pipe body can be conveniently assembled and disassembled. The problems of concrete segregation, impact damage and the like caused by shaking and deviation of a traditional guide pipe body are solved, and then workers can use the guide pipe conveniently.

The application provides a concrete water-retaining agent containing cycloaromatic amide and a preparation method and application thereof, raw materials are as follows: 70-80 parts of ethylene glycol monovinyl polyoxyethylene ether (EPEG), 4-6 parts of cycloaromatic amide, 400-500 parts of water, 50-60 parts of acrylic acid, 9-10 parts of acrylamide, 2-2.5 parts of oxidizing agent, 0.3-0.5 parts of chain transfer agent, 0.4-0.6 parts of reducing agent and 0.3-0.6 parts of catalyst. Compared with the prior art, the application synthesizes a polycarboxylic acid type concrete water-retaining agent containing cycloaromatic amide through an aqueous phase free radical polymerization reaction at normal temperature, the synthesis process is simple and easy to operate, the concrete segregation and bleeding problems can be solved, the workability of concrete can be improved, and the concrete slump and spread degree over time and early and late strength can be improved.

The invention discloses a concrete conveying system for a large-gradient long inclined shaft. The concrete conveying system comprises a ground concrete transport vehicle, a discharging device, an enamel chute, a transfer storage box, horizontal spiral concrete conveying equipment, an in-hole concrete transport vehicle and a control unit. The enamel chute is of a sectional structure and is composed of a plurality of hinged sections, and locking spherical hinges are arranged between the hinged sections and used for adapting to working conditions of different gradients. The lower end of the enamel chute is connected with the transfer storage box and connected with a feeding port of the horizontal spiral concrete conveying equipment, at least two material level detectors are arranged on the top of the transfer storage box in the length direction, and after detection signals are processed by the control unit, the variable frequency of the spiral conveying equipment is adjusted in real time. And the material level in the material storage box is maintained in a preset height interval of 1-1.6 m. The inclined shaft concrete conveying device can achieve efficient and stable conveying of inclined shaft concrete and has the advantages of being high in structural adaptability, continuous and uniform in feeding and capable of preventing concrete segregation and blockage.

The application relates to the technical field of composite thermal insulation formwork construction, and discloses a concrete pouring device based on composite thermal insulation formwork construction, which comprises a pouring mechanism and a material conveying pipe mechanism. The material conveying pipe mechanism comprises a material conveying inner pipe and an outer protective pipe, the outer protective pipe is fixedly installed outside the material conveying inner pipe, a cavity for injecting air is arranged between the material conveying inner pipe and the outer protective pipe, and a rubber hose is fixedly connected to the top end of the material conveying inner pipe. When the piston rod is pushed outwards, one end of the piston rod pushes the deceleration plate to overturn upwards, so that the deceleration plate is in a horizontal state. When more air is injected, the inclination angle of the deceleration plate tends to be horizontal, the contact area of the concrete and the deceleration plate is increased, the concrete falling on the deceleration plate is difficult to slide downwards quickly, and therefore the flow rate of the concrete is reduced to the maximum extent, and the segregation of the concrete is avoided.

This invention relates to a concrete placing system for pole production, comprising a gantry crane and a mixing plant, a conveying pipe, and a casting mold for composite poles. The composite pole is composed of a fiberglass skeleton and concrete. The system also includes a fixed plate, a placing cylinder, a buffer pipe, a rotating cylinder, a first movable plate, a second movable plate, a mixing component, and an arc-shaped plate. When the motor drives the rotating rod and ultimately rotates the rotating cylinder, the first and second mixing plates, through a connecting rod and rotation shaft design, not only perform circular motion but also reciprocate at small angles, with the gap between them changing. This causes the width of the flow channel between the mixing plates to constantly change, completely breaking the fixed flow field inside the concrete, effectively preventing concrete segregation, maintaining its workability and uniformity, and ensuring that the concrete is in optimal condition before casting, thereby significantly improving the overall mechanical properties and structural homogeneity of the final pole product.

The application discloses a vibrating production device for concrete prefabricated part processing and relates to the technical field of concrete prefabricated parts.The vibrating production device comprises a vibrating mechanism, translation sliding blocks installed on the two sides of the bottom of the vibrating mechanism, a formwork fixing mechanism arranged at the bottom of the vibrating mechanism, clamping sliding plates arranged on the two sides of the formwork fixing mechanism, a vibrating sliding disc, a longitudinal threaded sleeve fixedly installed on the top of the vibrating sliding disc, electric telescopic rods fixedly installed around the bottom of the vibrating sliding disc, support base plates fixedly installed at the bottom of the electric telescopic rods, and connecting ropes fixedly installed around the bottom of the support base plates.When the lifting frequency of the light foam disc and the detection rod is reduced, it is indicated that the air bubbles in the concrete have been discharged, at this time, the vibrating rod can be pulled out, the concrete in other areas is vibrated, the concrete is prevented from being vibrated excessively, and the segregation of the concrete is prevented from appearing, so that the quality of the formed concrete is affected.

The utility model relates to a vertical conveying slow descending device for high-vertical-distance concrete pouring, which comprises a feeding section, a second conveying section, a third conveying section, a fourth conveying section, a fourth conveying section and a fifth conveying section, wherein the feeding section comprises a feeding pipeline and a first flange plate arranged at the upper end of the feeding pipeline; a top plate of the primary buffer area is divided into a left part and a right part, the left part of the top plate is provided with a through hole communicated with the feeding section, a bottom plate is divided into a left part and a right part, and the right part of the bottom plate is provided with a through hole; the upper end of the buffer section is communicated with the right part of the bottom plate of the primary buffer area; a top plate of the secondary buffer area is divided into a left part and a right part, the right part of the top plate is provided with a through hole communicated with the lower end of the buffer section, and a bottom plate is divided into a left part and a right part, and a through hole is formed in the left part of the bottom plate; the upper end of the discharging section is communicated with the left part of the bottom plate of the secondary buffer area, and the discharging section comprises a discharging pipeline and a second flange plate; the concrete pipe is connected to the upper end of the feeding section and the lower end of the discharging section. According to the utility model, the concrete workability in vertical conveying can be improved, concrete segregation is avoided, and the concrete construction quality is improved.

The utility model discloses a cement concrete pouring device under a wave-shaped guardrail plate. Comprising a device frame, a pouring funnel, a feeding pipe, a discharging groove, an inserting piece, a wheel disc and a wheel disc lock catch. The device frame is formed by welding angle iron, the lower end of the handle is welded to the upper end of the device frame, the pouring funnel is installed in the device frame, the feeding pipe is welded to the bottom of the pouring funnel, and the discharging groove is installed at the middle slotting position of the feeding pipe in a hinged mode. A wheel disc and a wheel disc lock catch are installed on the side face of the feeding pipe, the wheel disc is driven to rotate through a wheel disc rotating handle so as to drive the discharging groove to achieve angle adjustment, after angle adjustment is completed, the wheel disc lock catch is driven to rotate by rotating a wheel disc lock catch handle to be clamped at the protruding position of the wheel disc, and limiting of the wheel disc is completed. The device is simple in structure, earth shoulder hardening pouring operation can be achieved under the condition that the wave-shaped guardrail plate is not dismantled, meanwhile, concrete disintegration caused by the too long discharging distance in the concrete pouring process can be avoided, and the construction quality is improved.

The invention discloses a concrete anti-segregation agent and a preparation method thereof, and belongs to the technical field of concrete admixtures. The anti-segregation agent comprises the following components in parts by mass: 40-60 parts of metakaolin, 15-25 parts of rice hull ash, 10-15 parts of limestone powder, 5-10 parts of a water-retaining and air-entraining component and 5-15 parts of a tackifying and strengthening component; during preparation, the three inorganic materials are mixed firstly, the water-retaining and air-entraining component is added for first mixing, and then the tackifying and strengthening component is added for second mixing. The anti-segregation agent disclosed by the invention can be used for treating segregation and bleeding of concrete, and the recommended mixing amount is 2.3-3.1 kg per cubic meter of concrete. The anti-segregation agent provided by the invention can quickly solve segregation and bleeding of concrete, improves the compressive strength and compactness (reduces the electric flux) of the concrete, and is easily available in raw materials, simple in process and suitable for industrial application.

The invention relates to the technical field of concrete conveying, in particular to a design method of a concrete self-sliding conveying descent control device, which comprises the following steps: acquiring a real coarse aggregate sample and a concrete mix proportion of to-be-conveyed concrete; numerical modeling: performing physical modeling on different types of descent control devices to obtain numerical models of the descent control devices; constructing a coarse aggregate numerical model based on the real coarse aggregate sample; parameter calibration: calibrating contact mechanical characteristic parameters among the coarse aggregate, the mortar particles and the steel pipe wall by adopting a physical experiment and numerical simulation combined calibration method; and the descent control device is designed, specifically, the type of the descent control device is selected based on the contact mechanical characteristic parameters obtained through calibration and actual construction requirements, parameters of the descent control device are determined, and design of the descent control device is completed. The optimal descent control device type of the to-be-conveyed concrete is determined by comparing and analyzing the efficiency difference of different types of descent control devices, so that the method can adapt to concrete conveying operation under the hectometer-level high-fall working condition, and balance between concrete segregation and pipe wall abrasion is effectively controlled.

This invention discloses a buffer feeding device for preventing segregation in concrete, relating to the field of concrete feeding technology. The invention includes a first buffer feeding mechanism and a second buffer feeding mechanism, both concentrically connected. The first buffer feeding mechanism has a feeding pipe eccentrically connected to its top, with an inlet pipe. A rotating buffer assembly is rotatably mounted inside the first feeding pipe, and the inlet pipe is configured to guide concrete to impact the rotating buffer assembly. The second buffer feeding mechanism has a second feeding pipe connected to the bottom of the first feeding pipe. A translational buffer assembly is slidably mounted inside the second feeding pipe via a guide rod, configured to guide and buffer the concrete flow through horizontal reciprocating motion. This invention, through the combined use of the rotating buffer assembly and the translational buffer assembly, forms a double buffer structure during the high-drop concrete conveying process, thereby greatly improving the buffering and anti-segregation effect for high-drop concrete.

This invention discloses a radiation-shielding aggregate, its preparation method, and a high-strength, crack-resistant, radiation-shielding concrete, belonging to the field of concrete technology. The process includes the following steps: S1. Mixing lead powder, iron ore powder, and barium cement evenly, adding hydrogen peroxide and water, granulating, and curing and heating at high temperature to obtain the aggregate core; S2. Immersing the aggregate core in a mixed solution of sodium alginate and boron fiber, then spraying it with a calcium chloride aqueous solution to obtain aggregate particles; S3. Mixing red mud and graphite powder evenly, calcining at 800-900℃, grinding and sieving, mixing evenly with an alkaline activator, adding water to obtain a slurry, then mixing the slurry with the aggregate particles, and molding to obtain the final product. The radiation-shielding aggregate of this invention can attenuate the radiation energy gradient, exhibiting excellent deceleration, weakening, and absorption effects on radiation rays. Simultaneously, the radiation-shielding aggregate of this invention has relatively low apparent density and high strength, which can prevent concrete segregation and improve the workability and mechanical properties of concrete.

A concrete pouring flow guide device solves the problem of concrete segregation caused during concrete pouring and adopts the technical scheme that the concrete pouring flow guide device comprises a flow guide pipe control part consisting of a supporting rack, a winch, a rope winding roller, a guide pulley and a control rope, and a pouring flow guide pipe part consisting of an inlet flow guide pipe, a middle flow guide pipe and an outlet flow guide pipe, the length of the flow guide pipe pouring part is controlled through the flow guide pipe control part to achieve concrete pouring. The device has the beneficial effects that the structure is simple, the use is convenient, the length of the pouring flow guide pipe part can be randomly changed along with the change of the concrete pouring depth, the specified distance between the concrete pouring opening position and the pouring surface is always kept, and the pouring quality is ensured.

The present application relates to a kind of by floating slurry layer thickness fast evaluation new pouring concrete segregation degree method, belong to concrete quality evaluation field, comprising: the close packing density of coarse aggregate is calculated;The total mass of coarse aggregate in single test piece is calculated;Limit segregation packing volume and limit segregation coarse aggregate height are calculated;The total thickness of concrete in test area is measured, and the thickness of limit segregation state mortar layer is calculated;Limit segregation ratio is defined;Select multiple point positions in test area to carry out actual measurement segregation ratio calculation, take average value to obtain final segregation index I;I is graded, and divided into two grades of qualified and unqualified grade.The present application breaks through the limitation of traditional qualitative evaluation, based on the close packing characteristics of coarse aggregate and the characteristics of test piece component, through multi-step logical deduction, the segregation degree is converted into the segregation index that can be accurately calculated, the subjectivity and ambiguity of naked eye observation are eliminated, the quantitative characterization of segregation state is realized, and the evaluation result is more objective and scientific.

The ditch paving equipment comprises a driving device, an operation device and a control device, the driving device comprises a chassis, an engine and a crawler belt assembly, the engine is installed on the chassis, and the engine is in transmission connection with the crawler belt assembly so as to drive the chassis to move or steer; the working device comprises a storage bin and a vibrator assembly, the storage bin and the vibrator are both installed on the chassis, the storage bin is used for storing concrete and is provided with a discharging port, and the vibrator is used for preventing the concrete in the storage bin from being separated and assisting the concrete to flow out from the discharging port; the control device is in communication connection with the engine and the track assembly. The chassis is driven to walk in the ditch through the crawler belt assembly, the action device is installed on the chassis and used for conducting paving operation in the ditch, and compared with existing ditch paving equipment pulled by a winch, the position of the fixing column does not need to be changed according to the bend of the ditch, and automatic turning can be achieved through differential change of the crawler belt assembly; and the paving efficiency of the ditch paving equipment is improved.