Fiber dispersing device suitable for ECC cast-in-place construction

Abstract

The utility model discloses a fiber dispersing device suitable for ECC cast-in-place construction. The fiber dispersing device comprises a feed port, the cylindrical pipeline is connected with the material inlet; the fiber scattering fan is arranged in the cylindrical pipeline; the rectangular pipeline is connected with the cylindrical pipeline; the circular pipeline is connected with the rectangular pipeline; the ventilation device is arranged in the circular pipeline; the sieve plate is arranged between the circular pipeline and the rectangular pipeline; the fiber dispersion screen is arranged in the circular pipeline; the discharging frame is connected with the circular pipeline; the upper and lower pipe wall rolling belts are arranged on the inner wall of the rectangular pipeline; the rolling crawler belt is arranged in the rectangular pipeline, and the rolling crawler belt is matched with the upper pipe wall rolling belt and the lower pipe wall rolling belt. The device has the advantages of improving the fiber dispersion degree and dispersion efficiency and ensuring the fiber integrity.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical manufacturing and fiber dispersion device technical field, specifically, relate to a kind of fiber dispersion device suitable for ECC cast-in-place construction. BACKGROUND

[0002] At present, with the continuous increase of infrastructure construction scale in China, the requirement of concrete structure is continuously improved. However, the existing concrete material has the problems of large brittleness and easy cracking, which seriously affects the service life of infrastructure and causes economic loss. In order to meet the high requirements of infrastructure development, fiber reinforced concrete emerges as the times require, among which the more typical one is engineered cementitious composite (ECC). ECC usually adopts Portland cement, ultra-fine quartz sand and fiber, which is designed, adjusted and optimized by the basic principles of fracture mechanics and micro mechanics, and can realize strain hardening behavior under the fiber content of about 2% of the composite material volume fraction, and the ultimate tensile strain can reach 3%-6%. Compared with ordinary concrete, the toughness, durability and fatigue resistance of ECC are greatly improved.

[0003] The improvement of ECC performance depends largely on the dispersion degree of fiber. The fibers that are not completely dispersed are easy to form clusters during stirring, which damages the stirring instrument and causes defects in the ECC, becoming stress defect points and affecting the overall mechanical properties of the material. At present, there are few devices for fiber dispersion, and most of the fiber is dispersed and put by manual in the construction process, which has large difference in dispersion effect and wastes a lot of manpower.

[0004] Based on the above, the following technical problems exist:

[0005] For fiber dispersion, manual dispersion and fiber placement are used in the construction process, which has large difference in dispersion effect and wastes a lot of manpower. CONTENT OF UTILITY MODEL

[0006] The main purpose of the utility model is to provide a fiber dispersion device suitable for ECC cast-in-place construction, to solve the technical problem of manual dispersion and fiber placement in the construction process in the prior art for fiber dispersion, which has large difference in dispersion effect and wastes a lot of manpower.

[0007] In order to achieve the above purpose, according to one aspect of the utility model, a fiber dispersion device suitable for ECC cast-in-place construction is provided, which comprises:

[0008] a feeding port;

[0009] a cylindrical pipeline connected with the feeding port;

[0010] A fiber dispersing fan is arranged in the cylindrical pipe;

[0011] A rectangular pipe is connected with the cylindrical pipe;

[0012] A circular pipe is connected with the rectangular pipe;

[0013] A ventilation device is arranged in the circular pipe;

[0014] A sieve plate is arranged between the circular pipe and the rectangular pipe;

[0015] A fiber dispersing sieve is arranged in the circular pipe;

[0016] A discharge rack is connected with the circular pipe;

[0017] An up-and-down pipe wall rolling belt is arranged on the inner wall of the rectangular pipe;

[0018] A rolling belt is arranged in the rectangular pipe, which cooperates with the up-and-down pipe wall rolling belt.

[0019] Preferably, the feeding port, the cylindrical pipe and the fiber dispersing fan constitute a mechanical dispersing module, the fiber dispersing fans are arranged in pairs in up-and-down arrangement, the fiber dispersing fan comprises a middle shaft arranged at the position of the axis of the cylindrical pipe, the middle shaft is connected with a motor fixed in the cylindrical pipe through a support frame, and the middle shaft is fixed with fan blades at equal intervals.

[0020] Preferably, the rectangular pipe, the up-and-down pipe wall rolling belt, the rolling belt and the sieve plate constitute a rolling dispersing module connected with the lower end of the mechanical dispersing module.

[0021] Preferably, the up-and-down inner walls of the rectangular pipe are provided with the up-and-down pipe wall rolling belts, and a plurality of protrusions are uniformly arranged on the up-and-down pipe wall rolling belts and the rolling belt.

[0022] Preferably, the rolling belt reciprocates, and when the rolling belt reciprocates, the protrusions of the rolling belt and the up-and-down pipe wall rolling belt form dynamic cross interference in the plane of the motion track.

[0023] Preferably, the circular pipe, the ventilation device and a plurality of fiber dispersing sieves constitute a high-pressure screening module, and the ventilation device is arranged between the sieve plate and the fiber dispersing sieve close to the sieve plate.

[0024] Preferably, the fiber dispersing fan comprises an upper fiber dispersing fan and a lower fiber dispersing fan, the rotating directions of the fan blades of the upper fiber dispersing fan and the lower fiber dispersing fan are arranged in opposite directions, the fan blades of the upper fiber dispersing fan are made of steel, and the fan blades of the lower fiber dispersing fan are made of silica gel.

[0025] Preferably, the convex of the rolling dispersion module is a semi-circular structure and a bionic sharkskin texture structure, and the distance between the convex of the upper and lower pipe wall rolling belt and the convex of the rolling track ranges from 1 to 3 mm.

[0026] Preferably, the air supply device in the circular pipeline adopts a Venturi tube or a flat nozzle.

[0027] Preferably, the mesh diameter of the fiber dispersion net gradually decreases along the airflow direction, and the circular pipeline and the fiber dispersion net are embedded with conductive materials which are grounded.

[0028] The technical scheme of the utility model has the following technical effects:

[0029] Through the three-stage dispersion mechanism of mechanical dispersion, rolling dispersion and high-pressure screening, the static friction between fibers can be effectively overcome, and uniform dispersion of fibers can be realized. The upper and lower fiber dispersion fans in the mechanical dispersion module are designed with different materials and rotating speeds to realize preliminary dispersion and fine dispersion of fiber bundles, respectively. The rolling dispersion module further separates fiber bundles through friction and shear force between the convexes to ensure loose fiber structure. The high-pressure screening module realizes step-by-step dispersion of fibers by using high-speed airflow and step-by-step reduced mesh diameters, avoids fiber damage and agglomeration, and has the technical effects of improving fiber dispersion degree and dispersion efficiency.

[0030] By controlling the rotating speed of the steel fan blade, the rolling track speed and the airflow speed, fiber breakage caused by mechanical shearing or airflow impact can be avoided. The conductive materials are embedded in the circular pipeline and the fiber dispersion screen and grounded to prevent fiber from re-agglomerating due to electrostatic action, thereby ensuring the integrity of the fibers.

[0031] The technical effects of improving construction efficiency and quality, high automation, reducing manual operation, improving fiber dispersion efficiency and reducing labor cost are achieved. Uniformly dispersed fibers can effectively improve the mechanical properties and durability of ECC and prolong the service life of infrastructure. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the present application, serve to explain the present application. The present application is shown in the drawings as follows:

[0033] Figure 1 Fig. 1 shows a structure schematic diagram of a fiber dispersion device suitable for ECC cast-in-place construction according to the present application;

[0034] Figure 2 Fig. 2 shows a side view of the fiber dispersion device suitable for ECC cast-in-place construction in Fig. 1; and Figure 1 Fig. 3 shows a side view of the fiber dispersion device suitable for ECC cast-in-place construction in Fig. 1.

[0035] Figure 3 A front view of a fiber dispersion device suitable for ECC cast-in-place construction in Figure 1 is shown.

[0036] Figure 4 A side view of a rolling dispersion module of a fiber dispersion device suitable for ECC cast-in-place construction in Figure 1 is shown.

[0037] Figure 5 A front view of a rolling dispersion module of a fiber dispersion device suitable for ECC cast-in-place construction in Figure 1 is shown.

[0038] Wherein, the above drawings include the following reference signs:

[0039] Inlet 1; cylindrical pipe 2; fiber dispersion fan 3; rectangular pipe 4; upper and lower pipe wall rolling belt 5; rolling track 6; sieve plate 7; circular pipe 8; air vent device 9; fiber dispersion sieve 10; discharge rack 11. DETAILED DESCRIPTION

[0040] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0041] As shown in Figures 1 to 5 , the present application provides a fiber dispersion device suitable for ECC cast-in-place construction, comprising: an inlet 1; a cylindrical pipe 2 connected with the inlet 1; a fiber dispersion fan 3 arranged in the cylindrical pipe 2; a rectangular pipe 4 connected with the cylindrical pipe 2; a circular pipe 8 connected with the rectangular pipe 4; an air vent device 9 arranged in the circular pipe 8; a sieve plate 7 arranged between the circular pipe 8 and the rectangular pipe 4; a fiber dispersion sieve 10 arranged in the circular pipe 8; a discharge rack 11 connected with the circular pipe 8; an upper and lower pipe wall rolling belt 5 arranged on the inner wall of the rectangular pipe 4; a rolling track 6 arranged in the rectangular pipe 4, and the rolling track 6 is matched with the upper and lower pipe wall rolling belt 5.

[0042] In this embodiment, the feeding port 1 is used for the input of the agglomerated PE fibers; the cylindrical pipeline 2 is used for supporting and fixing the fiber dispersing fan 3 and forming the fiber dispersing space, the cylindrical pipeline 2 is connected with the feeding port 1, and the agglomerated PE fibers enter the cylindrical pipeline 2 from the feeding port 1; the fiber dispersing fan 3 is arranged in the cylindrical pipeline 2, and the fiber dispersing fan 3 is used for dispersing the agglomerated PE fibers entering the cylindrical pipeline 2; the feeding port 1, the cylindrical pipeline 2 and the fiber dispersing fan 3 constitute a mechanical dispersing module, the fiber dispersing fan 3 is arranged in pairs in an up-down arrangement, the fiber dispersing fan 3 includes a middle shaft, the middle shaft is arranged at the axis position of the cylindrical pipeline 2, the middle shaft is connected with a motor, the motor is fixed in the cylindrical pipeline 2 through a support frame, a plurality of fan blades are fixed on the middle shaft at equal intervals, the fiber dispersing fan 3 includes an upper dispersing fan and a lower dispersing fan, the rotating directions of the fan blades of the upper dispersing fan and the lower dispersing fan are oppositely arranged, the fan blades of the upper dispersing fan are made of steel, and the fan blades of the lower dispersing fan are made of silica gel.

[0043] Specifically, the mechanical dispersing module includes the feeding port 1, the cylindrical pipeline 2 and two fiber dispersing fans 3, the two fiber dispersing fans 3 are arranged in an up-down arrangement and are each composed of a middle shaft and a plurality of fan blades, the middle shaft is installed at the axis of the cylindrical pipeline 2 and is connected with a motor, the middle shaft is driven to rotate by the motor, and then the two fiber dispersing fans 3 are rotated, thereby realizing the dispersing of the agglomerated PE fibers in the cylindrical pipeline 2. Among them, the fan blades are fixed on the shaft at equal intervals, the fan blades point to the inside of the pipeline, the upper and lower fiber dispersing fans 3 can be made of different materials, which are steel blades and silica gel blades respectively, the rotating speed of the steel blades is controlled at 500-750 rpm to realize the preliminary dispersion of the fiber bundles, and the rotating speed of the silica gel blades is controlled at more than 1000 rpm to realize the fine dispersion of the fibers. The rotating directions of the fan blades of the upper and lower fiber dispersing fans 3 are opposite, the diameter of the feeding port 1 is 100 mm, the diameter of the cylindrical pipeline 2 is 200 mm, and the diameter length of the cylindrical pipeline 2 is 500 mm. The two fiber dispersing fans 3 are arranged in an up-down arrangement and are each composed of a middle shaft and eight fan blades. The rotating speed of the upper fiber dispersing fan 3 is 600 rpm. The rotating speed of the lower fiber dispersing fan 3 is 1200 rpm. The rotating directions of the fan blades of the upper and lower fiber dispersing fans 3 are opposite, the middle shaft of the lower dispersing fan is sleeved in the middle shaft of the upper dispersing fan, and the power is provided by two motors, and the rotating direction and the rotating speed can be adjusted.

[0044] The rectangular pipe 4 is used for fixing and mounting the upper and lower pipe wall rolling belts 5 and the rolling track 6 and forming a rolling space. The mechanically dispersed modules enter the rectangular pipe 4 after being dispersed, and the rectangular pipe 4 is connected with the cylindrical pipe 2. The rectangular pipe 4, the upper and lower pipe wall rolling belts 5, the rolling track 6 and the sieve plate 7 constitute a rolling and dispersing module, the rolling and dispersing module is located below the mechanically dispersed module, and the sieve plate 7 is arranged between the circular pipe 8 and the rectangular pipe 4. The fiber dispersing screen 10 is used for gradually dispersing the PE fibers, and the fiber dispersing screen 10 is arranged in the circular pipe 8. The discharge rack 11 is used for stirring the dispersed fibers, and the discharge rack 11 is connected with the circular pipe 8. The upper and lower pipe wall rolling belts 5 are arranged on the inner wall of the rectangular pipe 4, the rolling track 6 is arranged in the rectangular pipe 4, the rolling track 6 cooperates with the upper and lower pipe wall rolling belts 5, the upper and lower inner walls of the rectangular pipe 4 are provided with the upper and lower pipe wall rolling belts 5, and a plurality of protrusions are uniformly arranged on the upper and lower pipe wall rolling belts 5 and the rolling track 6. The upper and lower pipe wall rolling belts 5 embedded in the pipe wall are stationary, the rolling track 6 reciprocates, power is provided by a motor, and the speed can be adjusted. The rolling track 6 is sleeved on a transmission device, and the transmission device is connected with the motor. The rolling track 6 reciprocates, when the rolling track 6 reciprocates, the protrusions of the rolling track 6 and the upper and lower pipe wall rolling belts 5 form dynamic cross interference in the motion track plane. The circular pipe 8, the ventilation device 9 and the plurality of fiber dispersing screens 10 constitute a high-pressure screening module, and the ventilation device 9 is arranged between the sieve plate 7 and the fiber dispersing screen 10 close to the sieve plate 7. The protrusions of the rolling and dispersing module are semicircular structures and bionic shark skin texture structures, the distance between the protrusions of the upper and lower pipe wall rolling belts 5 and the rolling track 6 ranges from 1 mm to 3 mm. The ventilation device 9 in the circular pipe 8 adopts a Venturi tube or a flat nozzle. The mesh diameters of the plurality of fiber dispersing screens gradually decrease along the airflow direction, and conductive materials are embedded in the circular pipe 8 and the fiber dispersing screens, and the conductive materials are grounded.

[0045] Specifically, when the fiber bundle passes through the crushing area, the upper and lower protrusions produce staggered shearing action with a relative speed difference of 0.1-0.3 m / s, and the fiber bundle surface bears 8-12 times of friction impact with alternating directions. The protrusions are designed with multi-texture of large surface roughness, which produces complex mechanical environment in bidirectional operation. The transverse shear force produced by staggered protrusions, the longitudinal tensile force formed by the phase difference of bidirectional movement, and the pulse compression load formed by the dynamic adjustment of the crushing belt spacing (0.5-2 mm) form a three-dimensional force field, which makes the static friction between fibers overcome, and the cohesion of the fiber bundle decreases by 60-70%. Single pass can make the dispersion degree of the fiber bundle reach more than 80%. The right side of the rectangular pipe 4 is provided with a sieve plate 7 for passing the fibers that have been preliminarily dispersed, to prevent the fibers that are still agglomerated from passing through. The protrusions in the crushing dispersion module are semicircular and are designed with bionic shark skin texture. The distance between the crushing track 6 and the top of the protrusions of the crushing belt should be controlled within 1-3 mm to ensure that enough friction force is generated between the protrusions to disperse the fibers. The movement speed of the crushing track 6 should be less than 0.5 m / s to prevent the fibers from further agglomeration due to the too fast speed of the track. A Venturi tube or a flat nozzle is used in the circular pipe 8 to concentrate the impact force of the airflow, and the airflow speed should be controlled at 40-60 m / s to avoid damage to the fibers. A plurality of fiber dispersion screens 10 are distributed in the circular pipe 8, and the pore size of the fiber dispersion screens 10 gradually decreases in the direction of the airflow, realizing the step-by-step dispersion of the fibers. The circular pipe 8 and the fiber dispersion screens 10 are embedded with conductive materials and grounded for preventing the fibers from re-agglomerating due to static electricity under the action of high-speed airflow. The cross-sectional size of the rectangular pipe 4 of the crushing dispersion module is 200 mm x 100 mm, the length is 1000 mm, the width of the upper and lower pipe walls crushing belt 5 is 100 mm, and the length is 2000 mm. The protrusions are semicircular, with a height of 5 mm, a diameter of 3 mm, and a spacing of 10 mm. The distance between the upper and lower pipe wall crushing belt 5 and the top of the protrusions of the crushing track 6 is 2 mm, the movement speed of the crushing track 6 is 0.3 m / s, and the pore size of the sieve plate 7 is 5 mm.

[0046] In this embodiment, the circular pipeline 8 is connected with the rectangular pipeline 4; the ventilation device 9 is arranged in the circular pipeline 8; specifically, the high-pressure screening module is located at the right side of the rolling dispersion module and is composed of the circular pipeline 8, the ventilation device 9 and a plurality of fiber dispersion screens 10. The circular pipeline 8 is used for passing in the high-speed airflow, when the ventilation device 9 is opened, the internal and external pressure difference is generated on the sieve plate 7, the rolled and dispersed fibers enter the high-pressure screening module through the sieve plate 7 and are further dispersed under the action of the airflow, the fiber dispersion screens 10 are arranged in the pipeline, and the step-by-step dispersion of the fibers is realized. The dispersed fibers are poured into the discharging frame 11 to start stirring. The high-pressure screening module: the diameter of the circular pipeline 8 is 150mm, the length is 500mm, the Venturi tube is used to concentrate the airflow impact force, the airflow speed is 50m / s. There are three fiber dispersion screens 10, the pore diameters are 3mm, 2mm and 1mm respectively, the pore diameters gradually decrease along the airflow direction, the copper wires are embedded in the circular pipeline 8 and the fiber dispersion screens 10 and are grounded and conductive.

[0047] Working principle:

[0048] The agglomerated PE fibers are poured into the mechanical dispersion module from the feeding port 1.

[0049] The motor is started to drive the fiber dispersion fan 3 to rotate. The steel fan blade of the upper fiber dispersion fan 3 rotates at a speed of 600rpm to preliminarily disperse the PE fibers. The silica gel fan blade of the lower fiber dispersion fan 3 rotates at a speed of 1200rpm to finely disperse the PE fibers.

[0050] The preliminarily dispersed PE fibers enter the rolling dispersion module. The rolling track 6 moves periodically and bidirectionally at a speed of 0.3m / s, the protrusions on the track 6 rub against the protrusions on the rolling belt 5 on the upper and lower walls of the rectangular pipeline 4, and the fiber bundles are repeatedly rolled to gradually separate the fiber bundles.

[0051] The preliminarily dispersed PE fibers enter the high-pressure screening module through the sieve plate 7. The high-pressure airflow is passed in from the circular pipeline 8 to drive the PE fibers to pass through the fiber dispersion screens 10. The fiber dispersion screens 10 step-by-step disperse the PE fibers to ensure that the fibers are uniformly dispersed.

[0052] The uniformly dispersed PE fibers are discharged from the outlet of the high-pressure screening module and are used for ECC cast-in-place construction.

[0053] From the above description, it can be seen that the above-described embodiments of the utility model realize the following technical effects:

[0054] Through three dispersion mechanisms of mechanical dispersion, rolling dispersion and high pressure screening, the static friction between fibers can be effectively overcome, and the uniform dispersion of fibers can be realized. The upper and lower fiber dispersion fans 3 in the mechanical dispersion module are designed with different materials and rotating speeds to realize the preliminary dispersion and fine dispersion of fiber bundles respectively. The rolling dispersion module further separates the fiber bundles through the friction and shear force between the protrusions to ensure the loose structure of the fibers. The high pressure screening module realizes the step-by-step dispersion of fibers by using high-speed airflow and step-by-step reduced screen mesh aperture, avoids fiber damage and agglomeration, and has the technical effects of improving the dispersion degree and dispersion efficiency of fibers.

[0055] By controlling the rotating speed of the steel fan blade, the speed of the rolling track 6 and the airflow speed, the fiber breakage caused by mechanical shearing or airflow impact can be avoided, the conductive material is embedded in the circular pipeline 8 and the fiber dispersion screen 10 and grounded to prevent the fiber from re-agglomeration due to static electricity, and the technical effect of ensuring the integrity of the fiber is achieved.

[0056] The technical effects of improving the construction efficiency and quality, high degree of automation, reducing manual operation, improving the fiber dispersion efficiency and reducing the labor cost are achieved. The uniformly dispersed fibers can effectively improve the mechanical properties and durability of the ECC and prolong the service life of the infrastructure.

[0057] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fiber dispersion device suitable for ECC cast-in-place construction, characterized in that, include: Feed inlet; A cylindrical pipe, wherein the cylindrical pipe is connected to the feed inlet; A fiber dispersing fan, wherein the fiber dispersing fan is disposed inside a cylindrical pipe; A rectangular pipe, which is connected to a cylindrical pipe; A circular pipe, which is connected to a rectangular pipe; A ventilation device, wherein the ventilation device is disposed in a circular pipe; A sieve plate, wherein the sieve plate is disposed between a circular pipe and a rectangular pipe; A fiber dispersion screen, wherein the fiber dispersion screen is disposed in a circular pipe; A discharge rack, which is connected to a circular pipe; Upper and lower pipe wall compaction strips are set on the inner wall of the rectangular pipe; A compacted track is installed in a rectangular pipe, and the compacted track cooperates with the compacted belts on the upper and lower pipe walls.

2. The fiber dispersion device for ECC cast-in-place construction as described in claim 1, characterized in that, The feed inlet, cylindrical pipe, and fiber dispersing fan constitute a mechanical dispersing module. The fiber dispersing fans are arranged in pairs, one above the other. Each fiber dispersing fan includes a central shaft, which is located on the axis of the cylindrical pipe. The central shaft is connected to a motor, which is fixed in the cylindrical pipe by a support frame. Fan blades are fixed at equal intervals on the central shaft.

3. The fiber dispersion device for ECC cast-in-place construction as described in claim 1, characterized in that, The rectangular pipe, the upper and lower pipe wall compaction belts, the compaction track and the screen plate constitute a compaction and dispersion module, which is connected to the lower end of the mechanical dispersing module.

4. The fiber dispersion device for ECC cast-in-place construction as described in claim 1, characterized in that, The upper and lower inner walls of the rectangular pipe are provided with upper and lower pipe wall rolling strips, and several protrusions are evenly provided on the upper and lower pipe wall rolling strips and rolling tracks.

5. The fiber dispersion device for ECC cast-in-place construction as described in claim 1, characterized in that, The rolling track reciprocates, and when the rolling track reciprocates, the protrusions of the rolling track and the rolling belts on the upper and lower pipe walls form a dynamic cross interference in the plane of the movement trajectory.

6. The fiber dispersion device for ECC cast-in-place construction as described in claim 1, characterized in that, The circular pipe, the ventilation device, and several fiber dispersing screens constitute a high-pressure screening module. The ventilation device is located between the screen plate and the fiber dispersing screens near the screen plate.

7. The fiber dispersion device for ECC cast-in-place construction as described in claim 1, characterized in that, The fiber dispersing fan includes an upper dispersing fan and a lower dispersing fan. The blades of the upper dispersing fan and the lower dispersing fan rotate in opposite directions. The blades of the upper dispersing fan are made of steel, and the blades of the lower dispersing fan are made of silicone.

8. The fiber dispersion device for ECC cast-in-place construction as described in claim 3, characterized in that, The protrusions of the compaction and dispersion module have a semi-circular structure and a biomimetic shark skin texture structure, and the distance between the protrusions of the upper and lower pipe wall compaction belts and the protrusions of the compaction track ranges from 1 to 3 mm.

9. The fiber dispersion device for ECC cast-in-place construction as described in claim 1, characterized in that, The ventilation device in the circular pipe is a Venturi tube or a flat nozzle.

10. The fiber dispersion device for ECC cast-in-place construction as described in claim 1, characterized in that, The mesh diameter of several fiber dispersion nets gradually decreases with the direction of airflow. Conductive material is embedded in the circular pipe and the fiber dispersion net, and the conductive material is grounded and conductive.

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