CN101319978A - Fluidity Measuring Instrument for Fresh Concrete - Google Patents

Abstract

A novel measuring instrument for the mobility of mixing concrete relates to a concrete measuring instrument. Aimed at the detects of the existing detecting method for the working performance of the concrete, the invention provides the novel measuring instrument for the mobility of mixing concrete for meeting the demands of accurately, simply, conveniently and fast detecting the mobility of the concrete in an actual project. A round through hole is arranged on a wall at the lower side of the shell of the invention; the lower end of a rack is fixedly connected with the upper end of a screw; the lower end of the screw is connected with a piston by thread; a gear is engaged with the rack; the rack is matched with the slide hole of a backing plate; a slide pin is fixed on the outer wall of the shell; a sleeve is provided with a through coaxial slot; the upper end of the coaxial slot is provided with an upper horizontal slot; the lower end of the coaxial slot is provided with a lower horizontal slot. The novel measuring instrument has the beneficial effects that: the measuring instrument has a simple structure, is flexibly and conveniently used and can fast and accurately measure the mobility of the concrete; besides, the measured data can scientifically estimate the flow properties of the concrete.

Description

Fluidity Measuring Instrument for Fresh Concrete

technical field

The invention relates to a concrete fluidity measuring instrument.

Background technique

At present, there are many kinds of instruments for evaluating the fluidity of concrete, such as the most common slump method, which evaluates the workability of concrete by measuring the slump value and slump expansion of concrete, and the L-shaped flow meter method, Orimet flow meter method, V-shaped funnel method, U-shaped filling test, J-shaped flow meter test, VSI method and slump method and other detection methods. Analysis and comparison of the existing detection methods found that there are many deficiencies. For example, the slump test is not sensitive enough for high fluidity self-compacting concrete, which generally changes within the range of 24-29cm. For example, the VSI method lacks accurate standards and largely depends on the experience of the tester, which is highly subjective and difficult to control. The disadvantage of the V-shaped funnel for detecting the fluidity of concrete is that the concrete must be filled with the V-shaped funnel, and it takes time and effort to fill the concrete. The smoothness of the inner wall of the V-shaped funnel affects the flow rate of the concrete. Coarse aggregates with large particle sizes will easily cause "blockage" at the "bottleneck" of the V-shaped funnel, which will increase the value of the V-shaped funnel and affect the flow performance of concrete. Accuracy. Although there are many detection methods that can accurately measure the working performance of self-compacting concrete, they are complex in operation, long in the experimental period, high in cost, and are greatly affected by human error, so they are not suitable for application in actual engineering.

Contents of the invention

The purpose of the present invention is to provide a new concrete fluidity testing device to solve the problems of complex operation, long experiment period, high cost, large influence factors of human error, and unsuitability for application in actual engineering in the existing concrete fluidity testing device. Measuring instrument.

The present invention is made up of casing, upper cover, piston, rack, sealing ring, screw rod, washer, nut, handle, gear, gear shaft, bushing, backing plate, sleeve, slide pin and handle cover, the lower side of the casing There is a circular through hole on the wall, a fan-shaped groove is opened in the top of the shell, a fan-shaped tenon is provided on the backing plate, the backing plate is set in the top of the shell, the fan-shaped tenon on the backing plate matches the fan-shaped groove on the shell, There is a sliding hole in the center of the backing plate, the rack is set on the upper side of the shell, the piston is set on the lower side of the shell, the lower end of the rack is fixedly connected with the upper end of the screw, the lower end of the screw is threaded with the piston, and the sealing ring Set on the upper side of the piston, the gasket is set on the upper side of the sealing ring, the nut is set on the upper side of the gasket, the nut is screwed with the screw, the rack is equipped with a scale, the handle is fixed on the outer wall of the upper part of the shell, and the handle cover Cooperate with the handle, the inner wall of the handle is provided with a bushing, the gear shaft is embedded in the bushing of the handle, the gear is fixed on the gear shaft, the gear meshes with the rack, the rack matches the sliding hole of the backing plate, and the sliding pin It is fixed on the outer wall of the shell, and the sleeve is set on the shell. There is a transparent axial groove on the sleeve, an upper horizontal groove is opened on the upper end of the axial groove, and a lower horizontal groove is opened on the lower end of the axial groove. , the axial groove, the upper horizontal groove and the lower horizontal groove are connected, the sliding pin is respectively slidingly connected with the axial groove, the upper horizontal groove and the lower horizontal groove, and the upper cover is threadedly connected with the top outer wall of the shell.

The beneficial effects of the invention are: the measuring instrument is simple in structure, flexible and convenient to use, can quickly and accurately measure the fluidity of concrete, and the measured data can scientifically evaluate the fluidity of the concrete.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention, Fig. 2 is a main sectional view of the overall structure of the present invention, Fig. 3 is a sectional view of the handle 9 and a gear 10, Fig. 4 is a sectional view of A-A of Fig. 1 , Fig. 5 is a backing plate 13 and the shell 1 A schematic diagram of the connection structure.

Detailed ways

Specific Embodiment 1: (See Figures 1 to 5) This embodiment consists of a housing 1, an upper cover 2, a piston 3, a rack 4, a sealing ring 5, a screw 6, a gasket 7, a nut 8, a handle 9, and a gear 10 , gear shaft 11, shaft sleeve 12, backing plate 13, sleeve 14, slide pin 17 and handle cover 18, and the wall of the lower side of the shell 1 has a circular through hole 1-2, and the top of the shell 1 has a The fan-shaped groove 1-4, the backing plate 13 is provided with a fan-shaped tenon 13-2, the backing plate 13 is arranged in the top of the shell 1, the fan-shaped tenon 13-2 on the backing plate 13 is in line with the fan-shaped groove 1-4 on the shell 1 Cooperate, there is a slide hole 13-1 at the center of the backing plate 13, the rack 4 is arranged on the upper side of the casing 1, the piston 3 is arranged on the lower side of the casing 1, and the lower end of the rack 4 is fixed to the upper end of the screw rod 6 Connection, the lower end of the screw rod 6 is threaded with the piston 3, the sealing ring 5 is arranged on the upper side of the piston 3, the gasket 7 is arranged on the upper side of the sealing ring 5, the nut 8 is arranged on the upper side of the gasket 7, the nut 8 and the screw rod 6 screw connection, scale 4-1 is set on the rack 4, the handle 9 is fixed on the outer wall of the upper part of the casing 1, the handle cover 18 is matched with the handle 9, the inner wall of the handle 9 is provided with a shaft sleeve 12, and the gear shaft 11 is inlaid In the shaft sleeve 12 of the handle 9, the gear 10 is fixed on the gear shaft 11, the gear 10 meshes with the rack 4, the rack 4 matches the sliding hole 13-1 of the backing plate 13, and the sliding pin 17 is fixed on the bottom of the shell 1. On the outer wall, the sleeve 14 is sleeved on the casing 1, and the sleeve 14 is provided with a transparent axial groove 16, and an upper horizontal groove 20 is formed at the upper end of the axial groove 16, and a horizontal groove 20 is formed at the lower end of the axial groove 16. The lower horizontal groove 21, the axial groove 16, the upper horizontal groove 20 and the lower horizontal groove 21 are in communication, the sliding pin 17 is respectively slidably connected with the axial groove 16, the upper horizontal groove 20 and the lower horizontal groove 21, and the upper cover 2 is connected to the shell 1 The top outer wall threaded connection.

Embodiment 2: (see FIG. 1 and FIG. 2 ) In this embodiment, the bottom end of the housing 1 is an inverted cone 1-1. The setting of the inverted cone is convenient for use, and the others are the same as the first embodiment.

Specific embodiment three: (see FIG. 1 and FIG. 4 ) In this embodiment, a strip-shaped through-hole 1-3 is provided between every two rows of circular through-holes 1-2 on the lower wall of the housing 1 . The elongated through holes 1-3 are conducive to the suction of concrete, and the others are the same as in the second embodiment.

Specific Embodiment 4: (see FIGS. 1 to 5 ) In this embodiment, the casing 1 , the piston 3 , the rack 4 , the handle 9 and the sleeve 14 are all made of stainless steel. Others are the same as in the third embodiment.

Embodiment 5: (see FIG. 3 ) In this embodiment, one end of the gear shaft 11 is provided with a square groove 11 - 1 . The tool rotation gear 10 can be inserted into the square groove 11 - 1 . Others are the same as in the fourth embodiment.

Measurement method: first rotate the gear 10 to move the rack 4 downward and drive the piston 3 to move down to the bottom of the casing 1, and move the sleeve 14 to the lower end of the casing 1. At this time, the sliding pin 17 is at the bottom of the sleeve 14. In the upper horizontal groove 20, hold the handle 9 and insert the measuring instrument vertically into the concrete to be measured, then lift the sleeve 14 upwards so that the slide pin 17 is in the lower horizontal groove 21 of the sleeve 14, and turn the gear 10 to make the rack 4 Moving upwards, the rack 4 pulls the piston 3 to move up to generate negative pressure in the casing 1, and the concrete to be measured enters the casing through the hole on the wall of the casing 1, and then moves the sleeve 14 to move the sliding pin 17 into the upper horizontal groove of the sleeve 14 20, the hole on the wall of the housing 1 is sealed by the sleeve 14, and the gear 10 is rotated to move the rack 4 downward and drive the piston 3 to move down, compressing the concrete in the housing 1 until the piston 3 can no longer move down. When the scale 4-1 on the rack 4 shows the volume of the concrete in the shell 1, the ratio of the volume of the concrete in the shell 1 to the volume of the negative pressure zone formed in the shell 1 when the piston 3 rises to the upper limit position, that is, the measured fluidity of concrete.

Claims (5)

1, a kind of measurer for fluidity of newly mixed concrete, it is by shell (1), loam cake (2), piston (3), tooth bar (4), O-ring seal (5), screw rod (6), pad (7), nut (8), handle (9), gear (10), gear shaft (11), axle sleeve (12), backing plate (13), sleeve (14), sliding pin (17) and handle cover (18) are formed, it is characterized in that: have manhole (1-2) on the wall of shell (1) downside, have fan groove (1-4) in the top of shell (1), backing plate (13) is provided with fan-shaped tenon (13-2), backing plate (13) is arranged in the top of shell (1), fan-shaped tenon (13-2) on the backing plate (13) matches with fan groove (1-4) on the shell (1), the center of backing plate (13) has slide opening (13-1), tooth bar (4) is arranged on the upside in the shell (1), piston (3) is arranged on the downside in the shell (1), fixedly connected with the upper end of screw rod (6) in the lower end of tooth bar (4), the lower end of screw rod (6) is threaded with piston (3), O-ring seal (5) is arranged on the upside of piston (3), pad (7) is arranged on the upside of O-ring seal (5), nut (8) is arranged on the upside of pad (7), nut (8) spins with screw rod (6), tooth bar (4) is provided with scale (4-1), handle (9) is fixed on the outer wall on shell (1) top, handle cover (18) matches with handle (9), the inwall of handle (9) is provided with axle sleeve (12), gear shaft (11) is set in the axle sleeve (12) of handle (9), gear (10) is fixed on the gear shaft (11), gear (10) and tooth bar (4) engagement, tooth bar (4) matches with the slide opening (13-1) of backing plate (13), sliding pin (17) is fixed on the outer wall of shell (1), sleeve (14) is set on the shell (1), have penetrating axial groove (16) on the sleeve (14), have level trough (20) in the upper end of axial groove (16), have level trough (21) down in the lower end of axial groove (16), axial groove (16), last level trough (20) and following level trough (21) are connected, sliding pin (17) respectively with axial groove (16), last level trough (20) and following level trough (21) are slidingly connected, and loam cake (2) is connected with the top outer wall thread of shell (1).

2, measurer for fluidity of newly mixed concrete according to claim 1 is characterized in that: the bottom of shell (1) is inverted cone (1-1).

3, measurer for fluidity of newly mixed concrete according to claim 2 is characterized in that: have strip through hole (1-3) between per two row's manholes (1-2) on the wall of shell (1) downside.

4, measurer for fluidity of newly mixed concrete according to claim 3 is characterized in that: shell (1), piston (3), tooth bar (4), handle (9) and sleeve (14) are made by stainless steel material.

5, measurer for fluidity of newly mixed concrete according to claim 4 is characterized in that: an end of gear shaft (11) is provided with square groove (11-1).

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