JPH07127253A - Execution method for joint grouting in mass concrete block - Google Patents

Abstract

PURPOSE:To facilitate the filling up of a filler into a place or a section requiring concentrative filling in the case of filling up the filler into each joint between blocks in a mass concrete structure which is divided into a plurality of blocks where concrete is placed. CONSTITUTION:A route for feeding a filler such as cement milk or the like is connected from a mixer to mix a filler to a grout pump 9 to enlarge the feed pressure of the filler, and further connected in series to a supply pipe 10, a supply header 11, a return pipe 14 and the mixer 8 for composing a circulating route. On the other hand, a plurality of riser pipes 12, 12... are branched from the supply header 11, and a plurality of outlets 1, 1... with a solenoid valve is severally provided in the riser pipes 12, 12.... The discharge port of the outlet is exposed to a joint grouting zone 2, and freely opened and closed from its outside through the control of the solenoid valve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for joint grouting in a mass concrete block, and more particularly to a construction method for joint grouting in a mass concrete block used for a mass concrete structure such as a concrete dam. .

[0002]

2. Description of the Related Art In mass concrete structures such as concrete dams and large bridge piers, the structure is divided into a plurality of blocks in order to suppress the occurrence of cracks caused by the heat of hydration of cement, and concrete is poured into each block. Are installed to construct a concrete structure. After that, the temperature of each concrete block is lowered to cause volume contraction, and a seam, that is, a minute gap is formed between the concrete blocks adjacent to each other.

On the other hand, on the joint grouting zone surface, a large number of outlets are arranged at regular intervals through a feeding pipe and a riser pipe embedded in concrete, and the discharge port is exposed on the joint surface. ing. Then, by injecting a filler such as cement milk having a predetermined concentration into the joint at a predetermined pressure from the plurality of outlets, the filler is filled in the joint and the adjacent concrete blocks are integrated with each other. Measured.

[0004]

As described above, the conventional construction method uses a plurality of outlets arranged at substantially equal intervals on the surface of the joint grouting zone by applying a constant pressure.
Fill the entire seam between blocks with a filling material such as cement milk. Therefore, when a partially insufficiently filled part or section occurs, it is difficult to intensively fill the part or section.

[0005] Therefore, there is a technical problem to be solved in order to be able to fill the entire seam with a predetermined filler by enabling the intensive injection of the filler from any place. The present invention aims to solve the problems.

[0006]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above-mentioned object, and a grout groove is provided at an upper part and a drain is provided at a lower part on the joint grouting zone surface of a mass concrete structure, and In a joint grouting method for discharging cement milk or the like from a large number of outlets arranged in a riser pipe through a feed pipe and the like and a riser pipe, mass concrete in which the outlet or the riser pipe is provided with an externally controllable switch Construction method of joint grouting in block, and on the joint grouting zone surface of the mass concrete structure, a grout groove is provided in the upper part and a drain is provided in the lower part, and it is arranged on the riser pipe through a feed pipe etc. and a riser pipe. Joint groutin that discharges cement milk from many outlets In method, there is provided a method of constructing the seam grouting in the mass concrete blocks provided by dividing said drain and grout groove.

[0007]

A large number of outlets are arranged on the surface of the joint grouting zone of the concrete structure through the feed pipe and the riser pipe. According to the first aspect of the invention, a switch such as an electromagnetic valve capable of externally controlling the opening / closing of the outlet of the outlet is attached to the outlet. Thus, from the outlet, as in the conventional case, a filler such as cement milk can be injected by a uniform pressing force over the entire joint between concrete blocks, and to a place or a compartment that needs to be intensively filled. By operating the switch of the outlet from the outside, the filling material can be filled in the outlet unit.

Further, a switch such as an electromagnetic valve which can be opened / closed from outside is provided at both ends or one end of the riser pipe. Thus, by operating the switch for the compartment that needs to be intensively filled, the filling material can be filled from the outlet of the riser pipe unit. next,
According to the second aspect of the present invention, by dividing the drain and the grout groove into a plurality of parts, it is possible to press-fit the filling material from the drain or the grout groove into a section that needs to be intensively filled.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. First, an outlet 1 with an electromagnetic valve according to the present invention will be described with reference to FIG. In the figure, reference numeral 2 denotes a joint grouting block formed by concrete pouring, and the upper and lower ends of the joint grouting zone 2 are provided with a grout groove 3 and a drain 4, respectively, and are respectively provided. Recess boxes 5, 5, 5, 5 are attached to both ends of the. Further, the recess boxes 5 and 5 provided at both ends of the grout groove 3 are connected to a discharge device (not shown) via a valve 6 and a pressure gauge 7, respectively.
Further, one of the recess boxes 5 and 5 provided at both ends of the drain 4 is connected to a discharge device (not shown) via the valve 6 and the pressure gauge 7 as described above. . Next, the feeding path of the filler such as cement milk will be described. The filler mixed by the mixer 8 is pressurized by the grout pump 9 and sent to the supply pipe 10. Then, the filling material is the valve 6
And supplied to the supply header 11 via the pressure gauge 7,
Furthermore, from the supply header 11 to a plurality of riser pipes 12,
12 ... is branched and delivered. Also, the riser pipe 12,
The remaining filling material delivered to 12 returns to the mixer 8 via the return header 13, the valve 6, the pressure gauge 7 and the return pipe 14 to form a circulation path and a pressure adjusting path for feeding the filling material. Has been done.

On the other hand, the plurality of riser pipes 12, 12 ... Branched from the above-mentioned supply header 11 are arranged in the joint grouting zone 2 at substantially equal intervals and are buried in concrete. Further, the riser tubes 12, 12 respectively
The plurality of outlets 1 and 1 with electromagnetic valves of the present invention attached to ... are exposed from the surface of the joint grouting zone 2 only at the discharge port of the filler, and the outlets 1, 1 ... From the arrangement of 12 ... and the installation intervals of the outlets 1, 1 ... in the riser pipes 12, 12, the filling area per unit is about 4.0-4.5 m ^2.
It is arranged so that.

Thus, prior to the filling of the filling material,
The joint between the two blocks is hermetically sealed in a hollow state by inserting the grout stop 15 between all the peripheral portions of the surface of the main joint grouting zone 2 and the surface of the adjacent concrete block. After that, the filling material sent to the feed pipe at high pressure by the grout pump 9 is the intermediate valve 6,
6 and the circulation path and the like, the pressure is adjusted, and is discharged from the outlets 1 and 1 with electromagnetic valves at a constant pressure via the supply header 11, riser pipes 12, 12 ,. In that case, if a section that needs to be filled with filler material or a location or section that is insufficiently filled is found in advance by the measurement results of a seam gauge, etc.,
The valves of the outlets 1, 1 ... With electromagnetic valves are controlled to be opened and closed by an external control, and intensive filling is performed on the above-mentioned location or section. Incidentally, the riser pipe 1
The washer header 16 connecting the ends of the pipes 2, 12 ... Is provided so that the inside of the pipe can be washed when the filling material needs to be filled again. When it becomes impossible to inject the filler from both directions of the pipe 14, it is injected from the washing header 16 as the next best measure. Further, the recess boxes 5, 5, ... Provided above and below the joint grouting zone 2 are used not only for discharging the supernatant of the filler, air, etc., but also for injecting the filler in some cases. Sometimes.

Next, FIG. 2 shows another embodiment, and the same components as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. In the same figure, electromagnetic valves 6a, 6a ... Which can be opened / closed from the outside are provided at both end portions of the riser pipes 12a, 12a. Thus, by performing the opening / closing control of the electromagnetic valves 6a, 6a ... For the compartments requiring intensive filling with the filling material, the filling can be performed from the outlets 1a, 1a. it can.

In this embodiment, the electromagnetic valves 6a, 6a are
.. are attached to the respective end portions of the riser pipes 12a, 12a .. However, the present invention should not be limited to these.
Also, the outlets 1, 1 ... In FIG. 1 and the riser pipe 12 in FIG.
Although electromagnetic valves are used as the opening / closing means for both ends of a, 12a ..., However, the opening / closing means is not limited to this, and other means that can be controlled from the outside may be used.

FIG. 3 shows still another embodiment. The same components as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. In the figure, the grout grooves 3a, 3a ... And the drains 4a, 4a ... Are each divided into a plurality of parts. And the grout groove 3
a, 3a ... and drains 4a, 4a ... Recess boxes 5, 5 ... Are provided at both ends, and further, the recesses at one end of each of the grout grooves 3a, 3a ... And the drains 4a, 4a. The boxes 5, 5 ... Are connected to a discharge device (not shown) via valves 6, 6 ... And pressure gauges 7, 7.

Thus, for the compartments where it is necessary to intensively fill the filling material, drains 4a, 4 from the injection device instead of the discharge device through the recess boxes 5, 5 ,.
The filling material is press-fitted in units of a ... Or grout grooves 3a, 3a. 3 shows an example in which the divided grout grooves 3a, 3a ... And the drains 4a, 4a ... Are provided above and below the joint grouting zone 2 surface, but in the middle or in the vertical direction of the joint grouting zone 2 surface. It may be provided at any position in the direction. In addition, a method of attaching an electromagnetic valve or the like to the outlets 1, 1 ... Or the riser pipes 12a, 12a ... Described in FIGS. 1 and 2, and the grout groove 3 of FIG.
.. and drains 4a, 4a .. may be combined.

Therefore, the present invention can be variously modified without departing from the spirit of the present invention, and it is obvious that the present invention extends to the modified one.

[0017]

As described in detail in the above embodiment, the present invention is provided with a switch such as an electromagnetic valve that can be controlled from the outside at both end portions of the riser pipe or the outlet, or a drain and a grout groove. By dividing or the like, it is possible to intensively fill the place or section where the filling material needs to be filled.

Thus, it is an invention which enables high-quality construction by filling the entire seam with a predetermined filler.

[Brief description of drawings]

FIG. 1 is an explanatory front view showing an embodiment of a construction method for seam grouting according to the present invention.

FIG. 2 is an explanatory front view showing another embodiment of the construction method of the seam grouting.

FIG. 3 is a schematic front view showing still another embodiment of a seam grouting construction method.

[Explanation of symbols]

 1,1a Outlet 2nd joint grouting zone 3,3a Grout groove 4,4a Drain 5 Recess box 8 Mixer 9 Grout pump 10 Supply pipe 11 Supply header 12,12a Riser pipe

Claims (2)

[Claims] 1. A large number of outlets provided on the riser pipe through a feed pipe and a riser pipe while providing a grout groove in the upper part and a drain in the lower part on the joint grouting zone surface of the mass concrete structure. In the joint grouting method for discharging cement milk and the like from the above, a method for joint grouting in a mass concrete block is characterized in that the outlet or the riser pipe is provided with a switch that can be controlled from the outside. 2. A large number of outlets disposed on the riser pipe through a feed pipe and the like and a riser pipe while providing a grout groove in the upper part and a drain in the lower part on the joint grouting zone surface of the mass concrete structure. A method for joint grouting in a mass concrete block, characterized in that the drain and the grout groove are provided separately in a joint grouting method for discharging cement milk or the like from the above.