JPH0454766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method and apparatus for pouring slurry made of concrete or mortar.

(Prior Art) Conventionally, for casting slurry made of concrete or mortar, slurry casting is carried out in which slurry is supplied from one end and flows out from the other end through an on-off valve provided at the other end. A construction pipe is used, and the slurry is supplied to the construction pipe by introducing the slurry from one end of the construction pipe or via a hose connected to the one end.

By the way, the slurry is used to prevent separation of the slurry due to high-speed free fall inside the vertically erected casting pipe, and when pouring the slurry into water, water is poured into the casting pipe. In order to prevent deterioration of the slurry due to entry of slurry, it is desirable that the slurry be discharged outside the casting pipe while filling the casting pipe and maintaining this state.

(Object of the Invention) The object of the present invention is to provide a method for reliably performing slurry casting by filling a slurry casting pipe with slurry and discharging the slurry outside the casting pipe while maintaining this filling. The goal is to provide equipment.

(Structure of the Invention) The slurry casting method according to the present invention includes measuring the pressure exerted by the slurry on the inner surface of the slurry casting pipe in the vicinity of the other end of the slurry casting pipe having one end to which the slurry is supplied. The slurry is cast while filling the inside of the slurry casting pipe with the slurry by adjusting the opening degree of the other end of the slurry casting pipe based on the measured value.

Further, the slurry casting device according to the present invention includes a slurry casting pipe having one end capable of receiving slurry and the other end provided with an on-off valve, and a slurry casting pipe having a slurry casting pipe in the vicinity of the other end of the slurry casting pipe. The present invention is characterized by comprising a pressure measuring device having a pressure receiving means arranged on the inner wall of the pouring pipe, and an opening degree adjuster for the opening/closing valve.

In the slurry casting device according to the present invention, the pressure receiving means is arranged on the inner wall of the slurry casting pipe at a location outside the vicinity of the other end and between the vicinity of the other end and the one end. It is characterized by

(Operations and Effects of the Invention) When the vertically erected slurry casting pipe is filled with slurry to a predetermined height, the pressure exerted by the slurry on the inner surface near the other end of the slurry casting pipe is The value can be known in advance by calculation or experiment.

Therefore, the fluctuation of the pressure value on the inner surface, that is, the measured value is read, and when the measured value is negative based on the pressure value, the on-off valve is closed or its opening degree is reduced, and when it is positive, the on-off valve is closed or the opening degree is reduced. By increasing the opening degree of the on-off valve and adjusting the opening degree of the other end of the pouring pipe, slurry can be discharged into the pouring pipe while filling the slurry pouring pipe with slurry and maintaining this state. Moreover, this slurry pouring can be carried out reliably.

Moreover, according to the apparatus of the present invention, the pressure exerted by the slurry supplied to the slurry casting pipe on the inner surface at the other end of the slurry casting pipe is sensed via the pressure receiving means, The flow rate of the slurry is measured by a pressure measuring device including:
It is controlled by the operation of the opening degree regulator.

Furthermore, by arranging the pressure receiving means between the vicinity of the other end of the slurry casting pipe and its one end, it is possible to eliminate the cause of fluctuations in the pressure value near the other end of the slurry casting pipe. For example, it is possible to know the approximate location of voids (bubbles) in a slurry.

EMBODIMENTS OF THE INVENTION The features of the invention will become clearer from the following description of illustrative embodiments for pouring a slurry of concrete or mortar into water.

Referring to FIGS. 1 and 2, there is shown an apparatus 10 for carrying out the slurry casting method according to the present invention.

The slurry casting device 10 includes a slurry casting pipe (hereinafter simply referred to as a casting pipe) 12 having a circular cross-sectional shape.

The casting pipe 12 is suspended via a crane C in a trench B constructed by excavating the ground while filling it with stabilizing liquid A, and its one end (upper end) 12a is above the level of stabilizing liquid A. is located above, and the other end (lower end) 12b is close to the bottom of the slot B.

A slurry supply source 14 such as a concrete pump or a mortar pump is installed at the upper end 12a of the casting pipe to supply slurry S into the casting pipe 12.
A slurry transport hose 16 extending from is connected,
Further, a pouring pipe 1 for slurry S is provided at the lower end portion 12b.
An on-off valve 18 is provided for adjusting the amount of discharge to the outside. Instead of the illustrated example in which the casting pipe 12 is configured with a pipe with both ends open, the casting pipe 12 is configured with a tremie (not shown), and the slurry is supplied by injecting the slurry from the upper end of the tremie. You can also do that.

On the inner wall near the lower end 12b of the casting pipe,
Pressure receiving means 20a forming a part of pressure measuring device 20
is located. The pressure receiving means 20a senses the pressure exerted by the slurry S supplied from the slurry supply source 14 through the upper end 12a of the casting pipe and filling the casting pipe 12. The sensed pressure is substantially equal to the pressure of the slurry S exerted on the inner surface of the casting tube 12 near the lower end 12b.

As shown in FIG. 3, the pressure receiving means 20a includes a diaphragm 24 disposed in a hole 22 bored in the casting pipe 12 and whose surface is in the same plane as the inner surface of the casting pipe 12, and a diaphragm 24 arranged in the hole 22. a plurality of strain gauges 2 fixed to the diaphragm 24 within a casing 26 fitted and connected to the diaphragm 24;
8. Casing 26
is fixed to the casting pipe 12 through a plurality of bolts 27 in a liquid-tight manner.

Strain in the diaphragm 24, which is elastically deformed by the pressure of the slurry S, is transmitted to the strain gauge 28. The strain gauge 28 has strain measurement means, strain-pressure conversion means,
It is electrically connected to peripheral equipment 20b (see FIGS. 1 and 2) consisting of pressure display means, etc.
The amount of strain is converted into a corresponding pressure value by the peripheral device 20b.

A pressure receiving means 20b similar to the pressure receiving means 20a can be arranged near the upper end 12a of the casting pipe. This pressure receiving means is electrically connected to the peripheral device 20b via a covered conductor 20e.
This pressure receiving means 20b is not limited to the vicinity of the upper end 12a, but may be located at a height above the pressure receiving means 20a arranged near the lower end 12b, and is usually located from the open end surface 12a of the upper end 12a. 1-2
It is placed at a height position below m.

The inner surface and upper end 12 near the lower end 12b of the casting pipe filled with slurry S to a predetermined height.
The pressure value at the inner surface near a can be known in advance by calculation or experiment.

Prior to casting the slurry, when the on-off valve 18 is opened, the stabilizing liquid A does not flow into the casting pipe 12 from the on-off valve, and the slurry does not fall freely inside the casting pipe 12. The measured value by the pressure receiving means 20a (hereinafter referred to as measured value α) is
The slurry S is supplied until the value (a) is reached when the chamber 2 is almost filled with the slurry. This value (a) is determined in advance by the method described above. Note that even in the case of pouring in the atmosphere rather than in water, the slurry is supplied into the pouring pipe until the measured value α becomes equal to the value (a).

After a predetermined amount of slurry S is supplied into the pouring pipe 12 and filled, the on-off valve 18 is opened and the slurry S is discharged. During pouring of slurry S, pouring pipe 1
The same amount of slurry as the discharged amount of slurry S is supplied into 2. In this way, the slurry S is poured while filling the pouring pipe 12 with the slurry S, and during this time, the measurement value α measured via the pressure receiving means 20a
remains almost at the expected value (a).

During pouring of the slurry S, the measured value α may be relatively significantly lower than the value (a). The reason for this is that voids are created in the slurry S in the pouring pipe 12,
When the weight of the slurry S in the casting pipe 12 decreases, it is conceivable that the stabilizing liquid A flows into the casting pipe 12 through the on-off valve 18.

If it is clear that the cause is the occurrence of a gap, the opening/closing valve 18 is completely closed or its opening degree is reduced, and this is maintained until the measured value α reaches the value (a). Furthermore, if it is clear that the inflow of stabilizing liquid A is the cause, the opening degree of the on-off valve 18 is reduced. The stabilizing liquid A that has flowed into the casting pipe 18 is pushed out of the casting pipe 18 through the on-off valve 18 by the continuously supplied slurry S. The measured value α increases approximately in proportion to the discharge amount of the stabilized liquid A that has flowed in. Measured value α is the above value
When (a) is shown, the opening degree of the on-off valve 18 is returned to the original level and the pouring is continued. Note that when the cause of the decrease in the measured value α is unknown, it is desirable to reduce the opening degree of the on-off valve 18.

Furthermore, the position where the gap is generated or the position of the liquid level of the inflowing stable liquid can be estimated based on the magnitude of the measured value (hereinafter referred to as measured value β) by the pressure receiving means 20d. That is, if the value of the measured value β when the measured value α indicates the value (a) is (b), then the measured value α is the value (a), and the measured value β is the value (b). and when the difference between the measured value α and the measured value β is equal to the difference between the value (a) and the value (b), the gap is generated above the position where the pressure receiving means 20d is arranged. It is expected that there will be. Further, the measured value α is lower than the value (a), the measured value β is lower than the value (b), and the difference between the measured value α and the measured value β is lower than the value (a) and the value (b). When the difference is less than the difference, it is expected that the gap or the liquid level will occur above the pressure receiving means 20a or be located between the pressure receiving means 20a and 20b. Furthermore, the measured value α is the value
When the measured value β is below (a) but maintains the value (b), the gap or the liquid level is almost equal to the pressure receiving means 2.
0a and the pressure receiving means 20b, or is expected to be located therebetween.

An example of the on-off valve 18 is shown in FIGS. 4 and 5.

The on-off valve 18 includes a rectangular base plate 30 forming a valve box and a pair of side plates 32 that are placed in contact with both sides of the base plate and fixed to each other via a plurality of bolts 31. Substrate 30 and side plate 3
The casting pipe 12 has holes 30a and 32a that are partially oval and circular in plan view, respectively.
A hole 32a in each side plate having a diameter equal to the diameter of
communicates with the hole 30a of the substrate defining the valve chamber, and the semicircular portions of the holes 30a, 32a are aligned.

The on-off valve 18 is attached to the casting pipe 12 by fixing one side plate 32 to a flange provided at the lower end 12b of the casting pipe via a plurality of bolts 33, and the circular hole 32a is inserted into the casting pipe. It is consistent with 12. Furthermore, a slurry guide pipe 34 having the same diameter as the casting pipe is connected to the opening/closing valve 18 on the side opposite to the casting pipe 12 . Slurry guide pipe 3
4 has a flange provided at its upper end portion fixed to the other side plate 32 via a plurality of bolts 36, and is aligned with the circular hole 32a of the side plate.

A plate-shaped valve body 38 is disposed in the hole 30a of the substrate and is movable in contact with the pair of side plates 32 and a wall defining the hole 30a. Further, the side wall of the semicircular portion defining the hole 30a constitutes a valve seat, and an arcuate member 40 made of an ultra-hard material is embedded in the valve seat with a portion thereof exposed.

The valve body 38 includes a semicircular first member 38a made of an ultra-hard material having a sharp tip that can come into contact with the arcuate member 40, and a tip portion to which the first member is fixed via a bolt 42. and a generally T-shaped second member 38b having a rear end projecting from the hole 30a.

The valve body 38 includes a cylinder tube 42a fixed to each side of the base plate 30 and a second member 3 of the valve body.
8b is driven by a reciprocating hydraulic jack 42 having a piston rod 42b pivotally connected to the piston 8b via a pin 44 about the pin. Valve body 38
The hole 32a in the side plate is opened in the illustrated state in which the piston rod 42b is advanced, and the hole 32a is closed in the state shown by the imaginary line in which the piston rod 42b is retracted. In addition, numerals 46 and 48 indicate the advancing side pressure liquid port and the retreating side pressure liquid port,
Further, reference numeral 50 indicates a sealing material arranged to maintain liquid tightness between the second member 38b of the valve body and the base plate 30 and the pair of side plates 32 that are in contact with the second member 38b.

The opening degree of the on-off valve 18 can be adjusted by an opening degree regulator 56 connected to the on-off valve 18 via an advance-side pressure fluid hose 52 and a retreat-side pressure fluid hose 54 and arranged on the ground.

Referring to FIG. 6, an advancing side pressure fluid hose 52 has one end connected to a connecting hose 58 that connects the advancing side pressure fluid ports 46 of the two hydraulic jacks 42 of the on-off valve, and the other end connected to a fluid reservoir 60. The retreating pressure fluid hose 54, which has one end connected to a connection hose 62 interconnecting the retreating pressure fluid ports 48 of both hydraulic jacks 42 and the other end connected to the fluid reservoir 60, has an opening adjuster 56. A solenoid valve 64 for changing the pressure fluid path is provided. In addition, the advancing side pressure fluid hose 52 includes
Further, a double acting cylinder 66 is provided between one end of the cylinder 66 and the solenoid valve 64, a hydraulic pump 68 is provided between the reservoir 60 and the solenoid valve 64, and a flow control valve 70 is provided between the solenoid valve 64 and the cylinder 66. It is provided.

When the valve body of the solenoid valve 64 is actuated (toward the right in the figure), the pressure fluid passes through the pressure fluid hose 52, passes through the solenoid valve 64 and the flow rate control valve 70, and enters the cylinder 6.
6 into one side of the cylinder tube 66a. This causes the piston rod 66b to retreat toward the cylinder tube. During this time, the same amount of pressure fluid as the inflow pressure fluid is pushed out from the other side of the cylinder tube 66a, flows into the advance side of the cylinder tube 42a of the on-off valve 18 through the connection hose 58 and the advance side port 46, and is pushed out from the other side of the cylinder tube 66a. 4
2b, the valve body 38 is moved in the direction of increasing the opening degree. Due to the movement of the piston rod 42b, the cylinder tube 42 is
The pressure fluid pushed out from inside passes through the pressure fluid hose 54 and flows into the reservoir 60 via the electromagnetic valve 64.

In addition, by operating the valve body of the solenoid valve 64 in the opposite direction (to the left in the figure), the pressure fluid passing through the hydraulic pump 68 flows through the pressure fluid hose 54 after passing through the solenoid valve 64, and the pressure fluid flows through the connection hose 62. and the cylinder tube 4 of the on-off valve 18 via the port 48 on the backward side.
The piston rod 42b flows into the retreating side of the piston rod 42b.
is moved backward, thereby moving the valve body 38 in the direction of decreasing the opening degree. Pressure fluid pushed out from the cylinder tube 42a through the advance side port 46 by the movement of the piston rod 42b passes through the pressure fluid hose 52 and flows into the other side of the cylinder tube 66a of the cylinder 66, thereby pushing the piston rod 66b. The same amount of pressure fluid that flows into the other side is pushed out from one side of the cylinder tube 66a, passes through the flow control valve 70, the solenoid valve 64, the hydraulic hose 54, and flows into the reservoir 60.

According to this opening adjuster 56, the piston rod 66b of the cylinder 66 is interlocked with the piston rod 42b of the hydraulic jack 42, and the amount of movement of both piston rods is in a proportional relationship. piston rod 66b
By measuring the direction and amount of movement of
According to the amount of movement of the valve body 38, the degree of opening of the on-off valve 18 can be determined. In the illustrated example, a scale 72 is provided parallel to the direction of movement of the piston rod 66b, and a pointer 74 pointing to the scale is attached to the piston rod 66b.

During pouring of the slurry, the opening adjuster 56 adjusts the measured value α near the lower end of the pouring pipe 12 to the above-mentioned value.
The opening degree of the on-off valve 18 can be controlled so as to approach (a), and thereby the inside of the casting pipe 12 can be always filled with slurry.

[Brief explanation of the drawing]

1 and 2 are schematic longitudinal sectional views of the slurry pouring device according to the present invention when slurry is not being poured and when it is being poured, respectively, FIG. 3 is a longitudinal sectional view of the pressure receiving means, and FIG. 4 5 is a plan view of the on-off valve, FIG. 5 is a longitudinal sectional view taken along line 5--5 in FIG. 4, and FIG. 6 is an explanatory diagram of the operation of the opening degree adjuster of the on-off valve. 10: Slurry casting device, 12: Slurry casting pipe, 18: Opening/closing valve, 20: Pressure measuring device, 20a,
20b: Pressure receiving means, 56: Opening degree adjuster.

Claims (1)

[Claims] 1. Measurement of the pressure exerted by the slurry on the inner surface of the slurry casting pipe near the other end of the slurry casting pipe, which has one end to which a slurry made of concrete or mortar is supplied; Casting the slurry while filling the inside of the slurry casting pipe with the slurry by adjusting the opening degree of the other end of the slurry casting pipe based on the value.
Slurry pouring method. 2. A slurry casting pipe having one end capable of receiving a slurry made of concrete or mortar and the other end provided with an on-off valve, and a slurry casting pipe having an inner wall near the other end of the slurry casting pipe. A slurry pouring device comprising: a pressure measuring device having a pressure receiving means arranged therein; and an opening degree adjuster for the opening/closing valve. 3. A slurry casting pipe having one end capable of receiving a slurry made of concrete or mortar and the other end provided with an on-off valve, the vicinity of the other end of the slurry casting pipe, the vicinity of the other end, and the one end. A slurry casting device comprising: a pressure measuring device having a plurality of pressure receiving means disposed on the inner wall of the slurry casting pipe at a location between the slurry casting pipe and the opening/closing valve;