JP2001164896A - Water stop method for concrete placing joint in direct concrete placing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a water leakage from a concrete placing joint in a direct concrete placing method and stop water reliably. SOLUTION: A projection 10 is protruded from an end form 9 at the prescribed position of the concrete placing joint 8 to form an injection groove 11 of a water stop material 21, an injection pipe 12 is arranged toward the injection groove 11 through the end form 9 and the projection 10, and a rod 20 is inserted into the injection pipe 12. When concrete 7 is placed, the tip section 9c of the injection pipe 12 is blocked by the rod 20. When the water stop material 21 is injected, the rod 20 is retreated to form an injection hole 14 at the tip section 9c of the injection pipe 12, and the water stop material 21 is injected into the injection groove 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stopping water at a concrete joint in a direct-cast concrete method, and more particularly, to reliably prevent water from leaking from a joint due to a trouble during concrete casting. The present invention relates to a method for stopping water at a concrete joint in a direct-casting concrete method.

[0002]

2. Description of the Related Art Normally, a direct-casting concrete method is a continuous casting method, so that there is no concrete joint portion. However, the excavator was unable to excavate during concrete placement,
If the trouble such as blockage in the wife form due to the decrease in the fluidity of concrete occurs and the trouble is repaired for a long time (4 hours or more), the fluidity of the concrete decreases and it is difficult to cast well. Therefore, concrete in concrete pumps and pipes is temporarily disposed of. Therefore, a joint is formed in the concrete, and water is leaked from the joint.

[0003] As a countermeasure for preventing water leakage, after the concrete is hardened, the inner formwork installed at the time of concrete casting is removed.
After adhering the waterproof material to the joint, the inner formwork is installed again.

[0004]

As described above, when a trouble occurs and a concrete splicing portion occurs, the inner mold is removed and water-stopping material is attached as a measure for stopping water at the splicing portion. This requires a great deal of labor and exerts a great influence on the process. In addition, there is a danger that a cold joint is generated due to a decrease in the water stoppage of the joint.

[0005] Therefore, when the direct-casting concrete method is carried out, it is possible to secure the water stoppage of the concrete joint at the time of normal operation and at the time of trouble, to prevent water leakage from the joint, and
A technical problem to be solved arises in order to obtain a method of stopping water at a concrete joint in a direct-cast concrete method that eliminates the danger of generating a cold joint, and the present invention solves this problem. The purpose is to:

[0006]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and comprises assembling an inner mold inside a tail plate of an excavator, and combining the tail plate with the inner mold. A concrete casting method in which after the concrete is poured in, the reaction force is applied to the inner formwork by a propulsion jack, and simultaneously with the propulsion of the excavator, the concrete poured in through the wife form by the press jack is pressed. In the method for stopping water at a concrete joint part in the method, a projection part is protruded from the end form at a predetermined position of the concrete joint part to form an injection groove for a water stopping material, and further, the injection groove is formed. An injection pipe is provided by penetrating the end mold and the projection toward the injection pipe, and a rod is inserted into the injection pipe, and the tip of the injection pipe is used by the rod when casting concrete. It is blocked and the lock is To form a pouring hole at the tip of the pouring pipe, and to inject the water-stopping material into the pouring groove. Is a method for stopping water at a concrete splicing portion in a direct-cast concrete method in which the press jack is reduced and the spout form is peeled off from the concrete after the concrete is self-supported. The groove allows the ring material to protrude into the concrete from the end form, attaches a jack to the face side of the end form, further fixes one end of the jack to the injection pipe, and A method for stopping water at a concrete splicing portion in a direct-casting concrete method in which a tip portion of a concrete material is fixed to the ring material and the jack is extended to move the ring material into the end form. Do Than it is.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. FIG. 1A shows a longitudinal side view of a tunnel T showing a construction state of direct-cast concrete. In the direct concrete method, the cutter head 3 of the shield excavator 1 having a circular cross section is installed toward the face F, the ground is excavated with the cutter head 3, and the inside of the tail plate 2 of the shield excavator 1 is set inside. Are assembled, concrete 7 is poured between the inner form 6 and the tail plate 2, and then a reaction force is applied to the inner form 6 by the propulsion jack 4 of the shield excavator 1. At the same time, the shield excavator 1 is propelled, and at the same time, the concrete 7 placed by the press jack 5 through the wand form 9 is pressed, and finally the concrete 7 is continuously cured while curing the concrete 7. The tunnel T is constructed by casting. FIG. 1B is a cross-sectional view of the upper half of the center line of the tunnel T.
Indicates the location of installation.

[0008] It is to be noted that a connecting portion 8 which will not be continuously cast will be described later.
Requires measures to prevent water leakage. Therefore, the normal jointing section 8 reduces the concrete placing work time from 8:00 to 17
The time is set from 17:00 to 2 o'clock to ensure continuous casting, so that one place is provided per day, or two
If the construction can be performed for 4 hours, the water stopping performance of the joint 8 can be further improved by providing one portion per week. Further, even when a cold joint is likely to occur due to a trouble or the like, it is necessary to ensure the waterproofness of the joint 8. An injection groove 11 for injecting the waterproof material 21 is formed in the concrete 7 in the joint portion 8. The injection groove 11 is formed by projecting a part of the end mold 9 horizontally in a ring shape to form a projection 10 or by attaching another steel material or the like to the end mold 9 in a ring shape. 10 is formed or performed.

FIG. 2 shows the details of the injection pipe 12 for the water-stopping material 21 for stopping the water at the joint 8. The tip end of the injection tube 12 is disposed, for example, so as to penetrate the end form 9 and the ring-shaped projection 10 having a cross section of 5 cm and a height of 5 cm horizontally from the end form 9. The injection tube 12 is a hollow tube, and has a tapered portion 13 tapering toward the injection hole 14 in the projection 10. Furthermore, a flange 15 is provided at the rear end.
Is provided, and a nut 16 for attaching a rod 20 described later is fixed. The injection pipe 12 near the flange 15
An elbow 17 connected to the injection pipe 12 is provided at the upper part of the valve, and a valve 18 for adjusting the injection of the water stopping material 21 is provided at the upper part thereof.
Is provided. A drain pipe 19 and a valve 18 used for cleaning the injection pipe 12 are provided at a lower portion. The injection tube 12
The outer diameter of the injection mold 12 and the inner diameter of the injection mold 12 may be welded in order to support the injection mold 12 in order to support it. Is in contact with the screw 12a
It is good to form it.

Further, a rod 20 is disposed in the hollow of the injection pipe 12 at a predetermined distance from the inner diameter of the injection pipe 12. The outer diameter of the distal end of the rod 20 has a tapered portion 20c having the same shape as the inner diameter of the tapered portion 13 of the injection tube 12, and the injection hole 14 of the injection tube 12 is connected to the tapered portion 20c.
Be sure to stopper with. Also, the rear part of the rod 20 is screwed with the nut 16 of the injection pipe 12 and
A screw portion 20a having a movement length of 0 is provided, and a shaft portion 20b having a predetermined outer diameter is formed between the screw portion 20a and the tapered portion 20c. The rear end of the rod 20 is connected to the injection tube 1 with a wrench (not shown) or the like.
It is formed on a hexagon head so that it can move horizontally inside 2.

Next, a method of forming the injection groove 11 and an injection method of the water blocking material 21 will be described with reference to FIG. FIG. 3A shows the joint portion 8 of the concrete 7, the end form 9 is disposed between the tail plate 2 and the inner form 6, and the concrete 7 is cast. As described above, a ring-shaped projection 10 is provided on the concrete-side surface 9b of the end form 9 as described above. A concrete joint portion 8 is formed by the tip surface 9c of the projection 10 and the concrete-side surfaces 9b, 9b. At this time, the injection pipe 12 is provided so as to penetrate the end form 9 and the projection 10, and the injection hole 14 of the injection pipe 12 is plugged with the rod 20 to prevent the inflow of the concrete 7. Block.

Next, as shown in FIG. 3 (b), after a predetermined curing time has passed and the concrete 7 has become independent, the press jack 5 shown in FIG. The surface 9a on the press jack side of the formwork 9 is moved toward the face F, and the surface 9b on the concrete side and the tip end surface 9c of the projection 10 are horizontally peeled off from the concrete 7 by 3 cm. The ring-shaped injection groove 11 having a depth of 3 cm is formed therein. Thereafter, as shown in FIG. 3C, the screw portion 20a of the rod 20 in the injection tube 12 is formed.
Is turned back with a wrench to open the injection hole 14 at the end of the injection pipe 12, and the water stopping material 2 is inserted into the injection groove 11.
1 is pumped and injected by an injection pump (not shown).

The water-stopping material 21 is formed by using a water-swelling urethane compound and checking the state of injection from the lower part to the upper part. After the injection of the water stopping material 21, as shown in FIG. 3 (d), the injection pipe 12 is again plugged with the rod 20, and the valve 18 of the drain pipe 19 is opened. 12 is cleaned with water.

Next, a second embodiment will be described with reference to FIG. FIG. 4A is a cross-sectional view showing a state where the ring member 22 is protruded from the inside of the end form 9 toward the concrete 7. The ring member 22 is made of, for example, a steel material having a cross section of 5 cm square, and the injection pipes 12 are fixed to the inside of the ring member 22 at eight locations in the inner circumferential direction similarly to the first embodiment. Also, on the concrete-side surface 9b of the wife formwork 9,
A ring-shaped concave groove 9d in which the ring member 22 can be built is provided. In this case, the surface 2 on the concrete side of the ring material 22
2b is projected 3 cm into the concrete 7 and the injection groove 1
Form one. On the other hand, a center-hole type hydraulic jack 24 is attached to the face F side of the end form 9 with bolts (not shown) or the like, and one end of the hydraulic jack 24 is attached to a bracket 23 fixed to the injection pipe 12. Secure with bolts (not shown) or the like.

The tip of the injection tube 12 is connected to the ring material 2.
The ring member 22 is fixed through the injection pipe 12 by operating the jack 24 because the ring member 22 is fixed inside the ring member 22.
Can be moved horizontally. Therefore, the wife formwork 9
The inside of the passage of the injection tube 12 has a hole 9e for moving the injection tube 12 therein.

Next, as shown in FIG. 4 (b), the jack 24 is extended toward the face F, and the ring member 22 is inserted into the concave groove 9d of the end form 9 so that the concrete 7 is removed. Then, the injection groove 11 is formed. At this time, the surface 22a of the ring material 22 on the side of the end form is aligned with the groove 9d, and the surface 22b of the concrete side of the end form 9 is also aligned with the surface 9b of the end form. Thereafter, as in the first embodiment, the rod 20 in the injection pipe 12 is retracted, and the water stopping material 21 is injected into the injection groove 11 from the injection hole 14. FIG. 4D shows a positional relationship between the press jacks 5 and the center-hole type hydraulic jacks 24 in the circumferential direction.

The size and shape of the projecting portion of the end form shown in the above embodiment and the size and shape of the ring material should not be limited to these, but may be determined by the design of the concrete joint portion. It is changed as appropriate.

Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0019]

As described above, according to the first aspect of the present invention, the protrusions are projected from the end mold to form the injection groove for the water-stopping material. A concrete joint with a tenon structure can be formed. Further, since the injection pipe of the water-stopping material is provided so as to penetrate the end form and the protrusion, the water stoppage of the concrete splicing portion can be easily and quickly performed.

According to the second aspect of the present invention, since the injection mold is formed by reducing the press jack and at the same time, the end mold is peeled off from the concrete, the injection groove can be formed easily and quickly.

According to the third aspect of the present invention, since the injection groove is formed by projecting the ring material from the end mold, the concrete cross-sectional area of the concrete joint is reduced, and the injection is reliably performed in a shorter curing period. Grooves can be formed. In addition, the jack is attached to the wife formwork, it is combined with the ring material via the injection pipe, and the injection groove is formed by extending the jack, so that the formation of the injection groove by the ring material and the injection of the waterproof material by the injection pipe are efficient. Can do well. In this way, it is possible to reliably perform the water stoppage at the joint portion of the concrete, so that the quality of the concrete can be ensured, and the safety such as the danger of generating a cold joint does not occur. The range is expanded.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional side view of a tunnel showing an embodiment of the present invention and showing a construction state of direct-cast concrete. 1B is a sectional view showing the upper half of the tunnel center line in FIG.

FIG. 2 is a side sectional view of a joint portion and an injection pipe.

FIG. 3 (a) is a side sectional view showing an installed state of a wife mold and an injection tube. (B) A sectional side view showing the formation state of the injection groove. (C) Sectional drawing which shows the injection | pouring state of a water stop material. (D) Side sectional drawing which shows the completion state of injection | pouring of a water stopping material.

FIG. 4 (a) is a side sectional view showing another embodiment, showing an installation state of a wife formwork, a ring material and the like. (B) A sectional side view showing the formation state of the injection groove. (C) Sectional drawing which shows the injection | pouring state of a water stop material. (D) A partially cutaway sectional view showing the arrangement positions of a press jack and a hydraulic jack.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavator 2 Tail plate 4 Propulsion jack 5 Press jack 6 Inner formwork 7 Concrete 8 Connection part 9 Wife formwork 10 Projection part 11 Injection groove 12 Injection pipe 14 Injection hole 20 Rod 21 Waterproof material 22 Ring material 24 Jack F Face

Claims (3)

[Claims] 1. An inner mold is assembled inside a tail plate of an excavator, and concrete is cast between the tail plate and the inner mold. Then, a reaction force is applied to the inner mold by a propulsion jack. In the method of stopping water in a concrete splicing part in a direct-casting concrete method in which concrete is poured through a wife form by a press jack simultaneously with the propulsion of the excavator, the concrete splicing part is A projecting portion is projected from the end mold at a predetermined position to form an injection groove for the water stopping material, and further, an injection pipe is provided by penetrating the end mold and the projection toward the injection groove. A rod is inserted into the injection pipe, and the tip of the injection pipe is closed with the rod at the time of casting concrete, and the rod is retracted at the time of pouring the water-stopping material, and the tip of the injection pipe is inserted. An injection hole is formed in the injection groove, and the water stopping material is inserted into the injection groove. A method for stopping water at a concrete joint in a direct-cast concrete method, characterized by injecting water. 2. The straightening groove according to claim 1, wherein after the concrete is self-supported, the press jack is reduced and, at the same time, the end form is separated from the concrete. Water stoppage method for concrete joints in cast-in-place concrete method. 3. The pouring groove allows a ring material to protrude into the concrete from the end form, attaches a jack to the face side of the end form, and further fixes one end of the jack to the pouring pipe. 2. The method according to claim 1, wherein the tip of the injection tube is fixed to the ring material and the jack is extended to move the ring material into the end form. Water stoppage method for concrete joints in the direct concrete method.