JP2003064996A - Vibration method for placing concrete for tunnel and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily, safely and efficiently perform vibration working. SOLUTION: In a process for placing concrete 16 for lining in a tunnel 14 by using a form 12, after the concrete 16 is placed between the form 12 and a tunnel inner wall face 46, a vibration tool 24 rotation-controlled and supported in a guide part 20 of the inside of the form 12 is protruded to the outside of the form 12 to be inserted in the placed concrete 16, vibration is given to the concrete 16 with the vibration tool 24, after it is compacted, the vibration tool 24 is housed in the inside of the form 12, and the edge face of the vibration tool 24 is the same plane as the outer peripheral face of the form 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when placing concrete for lining, mainly for secondary lining in a tunnel, vibrates the concrete placed between the formwork and the inner wall surface of the tunnel. The present invention relates to a vibration method and a device therefor. In the present specification, "casting" means filling mud-like concrete that has not been cured by curing between the formwork and the inner wall surface of the tunnel.

[0002]

2. Description of the Related Art Originally, when placing concrete for secondary lining in a tunnel, the formwork for placing the concrete was folded forward and conveyed after the concrete was placed.
It was carried out by a mobile formwork where it was unfolded and installed, and concrete was placed at that location.

After placing the concrete in the formwork at a predetermined position in the tunnel, the concrete is placed through a concrete conveying pipe from openable and closable inspection windows at predetermined places provided in the formwork.

At this time, in order to improve the strength and durability of the concrete after curing and hardening, a vibrating tool is projected from the same or another inspection window and inserted into the placed concrete. The placed concrete was compacted to remove air bubbles mixed in the concrete.

Most of the vibrating tools have a vibrating portion at the tip of the power cord. Therefore, an operator directly grasps the cord, opens the inspection window, and projects it. Lean out from the inspection window and insert the vibrating part into the placed concrete, move the vibrating part back and forth, left and right and up and down (wielding), and give vibration to the placed concrete by vibrating the vibrating part, After the vibration work was completed, it was stored from the inspection window.

The above-mentioned work is performed manually by the worker.

Further, the applicant of the present application has previously applied for a vibrating method and a vibrating device described in Japanese Patent Laid-Open No. 10-8898 for automatically vibrating the concrete being poured.

In this example, a concrete sensor is provided in the vicinity of the entrance / exit of the vibrating tool provided on the formwork, and the vibrating tool is provided to be extendable from the entrance / exit, and the concrete sensor detects the concrete placement amount. , Projecting from the entrance and exit of the vibrator, vibrating, and storing.

[0009]

Conventionally, when an operator performs a vibrating work of concrete placed by a vibrating tool for improving the strength and durability of the concrete, the operator manually forms the vibrating part of the vibrating tool. Since it was projected from each inspection window of the frame and moved in the front-back, left-right, and up-down directions, the placing concrete was vibrated by the vibration of the vibrating part, and it was stored from the inspection window after the completion of the vibrating work. Is long
The problem was that workability was extremely poor.

In addition, it is necessary for the worker to lean out from the inspection window during the vibrating work, if necessary, and it is dangerous. Therefore, the work must be performed carefully, which is safe and in a short time. Not only could work not be performed, but it was also a factor in delaying the construction period.

Further, when concrete is placed up to the vicinity of the inspection window during vibration work, the vibrating tool is stored from the inspection window during this work, the inspection window is closed, and the inspection window is moved to another inspection window. However, it is necessary to open this inspection window and project the vibrating tool to vibrate near the inspection window where the concrete was placed. The vibration near the inspection window during vibrating work must be performed from the same location. Therefore, the problem was that the work efficiency was not good.

Further, in the vibrating method and the vibrating device disclosed in Japanese Patent Laid-Open No. 10-8898, which automatically vibrates the cast concrete by the vibrating tool, the work load on the operator can be drastically reduced. However, not only the cost rises, but also the structure becomes complicated and maintenance is very troublesome.

Further, in this example, since the contact area between the vibrating tool and the entrance / exit of the formwork was large, when the vibrating tool was pulled back from the casting concrete and stored in the formwork, the pouring concrete and the vibrating tool were Since the frictional resistance is increased and a large load is applied to the expansion / contraction mechanism of the vibrating tool, there has been a problem that the expansion / contraction mechanism is upsized.

In view of such drawbacks, it is an object of the present invention to provide a vibrating method and apparatus for vibrating concrete for tunnels, which enables easy, safe and efficient work. .

[0015]

According to the present invention, in a step of placing concrete for lining in a tunnel using a formwork, after placing concrete between the formwork and the tunnel inner wall surface. The vibrating tool, which was supported by controlling the rotation of the guide inside the form, was projected to the outside of the form and inserted into the placed concrete. The vibrating device vibrated the concrete to compact the concrete. After that, the vibrating tool is housed inside the formwork, and the tip end surface of the vibrating tool is made flush with the outer peripheral surface of the formwork, or the rotation control means of the vibrating tool in the guide portion is the vibrating tool. Was inserted into the outer peripheral edge of
A non-slip inner contact with the vibrating tool, and a control projection that contacts the guide portion when the vibrating tool vibrates on the outer side that does not contact the vibrating tool.
Alternatively, the first support plate and the second support plate are spaced apart from the guide portion by a predetermined distance.
A support plate is provided, and the length of the vibrating tool with respect to the mold is controlled by contacting both support plates of a control member fitted in the vibrating tool, or vibration of the mold. A guide tool with a tapered portion that widens toward the inside of the mold is arranged at the tool protruding portion, the contact area between the mold and the vibrating tool is reduced, friction resistance is reduced, and storability is improved. It is characterized by that.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A vibrating device for a cast concrete for a tunnel according to the present invention is a movable formwork for placing a concrete 16 for lining, mainly for a secondary lining in a tunnel 14. It is attached to the No. 12 and has the following configuration as shown in FIGS.

A vibrating tool entrance / exit 1 penetrating the form 12 to the outside.
A plurality of 8 are provided.

Form 12 corresponding to this vibrating tool entrance / exit 18
A vibrating tool 24 supported via a rotation control means 22 is attached to a guide portion 20 disposed inside the vibrating tool entrance 18 so that the vibrating tool 24 can freely enter and exit.

In this example, the vibrating tool 24 is the power cord 2.
A high-frequency vibrating portion 28 is provided at the tip of 6, and the high-frequency vibrating portion 28 serves as a protruding portion from the vibrating tool inlet / outlet 18.

The guide portion 20 is a pair of support columns 30 that form a space for the vibrating tool 24 to move in and out. Further, the middle portion of the support column 30 controls the protruding length of the vibrating tool 24 to guide and support it. The storage length of the vibrating tool 24 is controlled and guided and supported by the support plate 32 and the tip portion of the support column 30 that is separated from the first support plate 32 by a predetermined distance, and the tip surface of the stored vibrating tool 24 is fixed to the form 12 of the mold 12. The second support plate 34 is controlled and supported so as to be flush with the outer peripheral surface.

In this example, the rotation control means 22 of the vibrating tool 24 has a simple structure, and in order to facilitate maintenance, the vibrating tool 24 is fitted into the outer peripheral edge of the vibrating tool 24 separately from both sides. The non-slip member 36 is in contact with the inside of the vibrating tool 24, and the guide portion 2 is not in contact with the vibrating tool 24 when the vibrating tool 24 vibrates.
The control protrusions 38 that come into contact with the support columns 30 of 0 are arranged as annular control members.

The non-slip member 36 is a three-layer structure in which sandpaper is arranged inside, elastic material such as rubber is arranged in the middle portion, and steel plate is arranged outside, and the non-slip member 36 secures the control member to the vibrating tool 24. It becomes possible to fix it to.

When the vibrating tool 24 is projected from the vibrating tool inlet / outlet 18, when the vibrating tool 24 is pushed out in the projecting direction (outside of the mold 12), the control member fitted in the vibrating tool 24 becomes
When the vibrating tool 24 is brought into contact with the first support plate 32 of the guide portion 20 and the protrusion thereof is controlled, and the vibrating tool 24 is stored from the vibrating tool inlet / outlet 18, the vibrating tool 24 is pulled in the storage direction (inside the mold 12). When returned, the control member fitted in the vibrating tool 24 is
The second support plate 34 of the guide portion 20 is brought into contact with the second support plate 34 to control storage further, and the tip end surface of the stored vibrating tool 24 can be made flush with the outer peripheral surface of the mold 12.

By bringing the vibrating tool 24 into contact with the support plates 32 and 34, the moving length (moving distance) of the vibrating tool 24 with respect to the mold 12 can be adjusted so that the vibrating tool can be moved in the conventional vibrating work manually by an operator. Can be greatly reduced for distance,
Workability can be further improved.

The first support plate 32 and the second support plate 32 of the guide portion 20
Since the length of the vibrating tool 24 with respect to the mold 12 is determined by the distance between the vibrating tool 24 and the supporting plate 34, when adjusting the moving length of the vibrating tool 24, the first supporting plate 32 and the second supporting plate 32 of the guide portion 20 are used.
It is necessary to make the distance between the support plate 34 and the support plate 34 adjustable.

When the vibrating tool 24 is stored, the tip end surface of the vibrating tool 24 is flush with the outer peripheral surface of the form 12,
Since the front end surface of the vibrating tool 24 closes the vibrating tool inlet / outlet 18 of the form 12, the penetration of the cast concrete 16 into the inside of the form 12 is prevented, and the finished surface of the cast concrete is flat with no steps. The condition can be maintained, and the concrete can be poured uniformly and with high quality.

When the vibrating tool 24 is vibrated so as to project from or be housed in the vibrating tool inlet / outlet 18, the vibrating tool 24 contacts the outer peripheral edge of the vibrating tool inlet / outlet 18 (form 12), so that the vibrating tool 24 rotates. Although it moves (see the arrow in FIG. 3), the control protrusion 38 causes the pair of columns 30 of the guide portion 20 to follow this rotation.
Since the rotation force of the vibrating tool 24 applied to the operator who holds the vibrating tool 24 is drastically reduced, the rotation of the vibrating tool 24 due to the vibration is transmitted to the power cord 26. The power cord 26 does not come off from the socket, and work is not hindered.

A guide 42 having a tapered portion 40 that widens toward the inside of the mold 12 is provided at the vibrating tool inlet / outlet 18.

Due to the taper portion 40 of the guide tool 42,
The contact area between the mold 12 and the vibrating tool 24 is reduced, the frictional resistance is reduced, the vibrating tool 24 is easily pulled back from the placed concrete 16, and the storability of the vibrating tool 24 is improved.

Further, the guide tool 42 is preferably made of an elastic material to prevent the cast concrete 16 from entering the inside of the mold 12.

Therefore, the high-frequency vibrating portion 28 of the vibrating tool 24 is
Are supported by three points of the guide tool 42, the first support plate 32 of the guide portion 20, and the second support plate 34.

Reference numeral 44 in the drawing denotes a chain for hooking a control member, which is the rotation control means 22, on the column 30 of the guide portion 20, and 46 denotes an inner wall surface of the tunnel.

A method of vibrating the concrete 16 for secondary lining placed between the frame 12 and the inner wall surface 46 of the tunnel through this apparatus will be described in detail below.

First, the mold 12 is moved to a predetermined position of the tunnel 14.

Next, an inspection window (not shown) at the concrete pouring place is opened, and a concrete discharge pipe (not shown) is projected from this inspection window, or concrete 16 is delivered from a dedicated concrete pouring port (not shown). Is placed between the formwork 12 and the tunnel inner wall surface 46.

Next, a predetermined location (one location or a plurality of locations)
The high frequency vibrating portion 28 of the vibrating tool 24 is projected from the vibrating tool inlet / outlet port 18 and inserted into the concrete 16 in which the high frequency vibrating portion 28 is placed.

At this time, the vibrating tool 24 is moved in the projecting direction (form 12
Of the first support plate 3 of the guide portion 20 when the control member, which is the rotation control means 22 inserted into the vibrating tool 24, is pushed out.
2 is abutted and further protrusion is controlled.

Next, the high frequency vibrating portion 28 of the vibrating tool 24 is vibrated for a predetermined time.

At this time, when the vibrating tool 24 is vibrated to be projected or housed from the vibrating tool inlet / outlet 18, the vibrating tool 24 comes into contact with the outer peripheral edge of the vibrating tool inlet / outlet 18 (vibrating tool projecting portion of the form 12). , Vibrating tool 24 (high-frequency vibrating section 2
8) rotates, but with this rotation, the control projection 38 comes into contact with the pair of support columns 30 of the guide portion 20, and the rotation is controlled,
The turning force of the vibrating tool 24 applied to the operator is drastically reduced, and the vibrating tool 2
The rotation caused by the vibration of No. 4 is not transmitted to the power cord 26, and the power cord 26 does not come out of the socket, which does not hinder the work.

Next, the high-frequency vibrating portion 28 of the vibrating tool 24 is stored from the vibrating tool inlet / outlet 18.

At this time, the vibrating tool 24 is housed in the storage direction (form 12).
(Inside), the control member, which is the rotation control means 22 inserted into the vibrating tool 24, moves to the second support plate 3 of the guide portion 20.
It is possible to bring the tip end surface of the stored vibrating tool 24 into the same plane as the outer peripheral surface of the mold 12 while abutting against the outer peripheral surface of the mold 4 and controlling the further storage.

Therefore, the finished surface of the cast concrete can be made flat without any step, and the concrete can be poured uniformly and with high quality.

In addition to this, the front end surface of the vibrating tool 24 has the form 1
Since the second vibrating tool entrance / exit 18 is closed, it is possible to prevent the concrete 16 that has been placed from entering the inside of the form 12, and it is possible to eliminate the conventional opening / closing operation of the inspection window for moving the vibrating tool in and out. .

Further, the tapered portion 40 of the guide tool 42 reduces the contact area between the mold 12 and the vibrating tool 24,
Friction resistance is reduced, the vibrating tool 24 is easily pulled back from the pouring concrete 16, and the storability of the vibrating tool 24 is improved.

Even when concrete is placed up to the vicinity of the vibrating tool entrance / exit 18, the vibrating tool 2 is inserted into the vibrating tool entrance / exit 18.
Since 4 is in the inserted state, the vibrating tool 24 can be vibrated as it is, and the pouring concrete near the vibrating tool inlet / outlet 18 can also be vibrated, and the working efficiency is significantly improved.

Next, after the pouring of a predetermined amount of concrete 16 is completed, the concrete carrying-out pipe from the inspection window is stored, the inspection window is closed, or the dedicated concrete pouring port is closed.

At this time, the same vibrating tool 24 is again placed in accordance with the amount of the concrete 16 that has been placed.
The concrete 16 that has been placed can be vibrated more reliably by inserting it inside and vibrating it.

By the contact of the control member, which is the rotation control means 22 fitted into the vibrating tool 24, to both the support plates 32 and 34 of the guide portion 20, the length (movement) of the vibrating tool 24 with respect to the mold 12 (movement). (Distance) can be significantly shortened with respect to the total moving distance of the vibrating tool in the conventional vibrating work manually performed by the worker, so that the worker needs to lean out of the formwork and perform the vibrating work. Instead, the vibrating tool 24 may be moved in and out through the vibrating tool inlet / outlet port 18 of the form 12, and the work can be performed easily and safely.

After that, the concrete carrying-out pipe is projected from another inspection window, or concrete 16 is placed from the concrete placing port to a separate place, and similarly to the above, the projecting and placing of the vibrating instrument 24 from the vibrating instrument inlet / outlet 18 are performed. Concrete 16
Each operation of inserting into the inside, vibrating the vibrating tool 24, and storing the vibrating tool 24 from the vibrating tool inlet / outlet 18 is sequentially performed, and the tunnel 1
The concrete 16 is sequentially placed on the lower part on the side opposite to the excavating side, the lower part on the excavating side, the upper part on the opposite side to the excavating side, and the upper part on the excavating side, and the concrete 16 is vibrated.

In this example, the guide portion 20 is composed of a pair of columns 30, a first support plate 32 and a second support plate 34. Other structures can be freely adopted as long as the structure is flush with the outer peripheral surface of the.

Further, the rotation control means 22 is a control member in which the slip stopper 36 is arranged inside and the control projection 38 is arranged outside, but other structure capable of controlling the rotation of the vibrating tool 24 is not adopted. Be free.

Further, the length of the vibrating tool 24 coming in and going out is increased by abutting the guide member 20 of the control member, which is the rotation control means 22 fitted in the vibrating tool 24, against the first support plate 32 or the second support plate 34. Although the (moving distance) is controlled, it is free to adopt another structure capable of controlling the moving length of the vibrating tool 24.

Further, the vibrating tool inlet / outlet 18 provided in the form 12
Also, it is obvious that the number of the vibrating tools 24 attached to each vibrating tool entrance / exit 18 may be appropriately increased or decreased depending on the shape and size of the tunnel for lining the concrete.

Further, it is obvious that the vibrating method and the vibrating apparatus according to the present invention can be used for placing concrete in a tunnel having a substantially semicircular diameter, a circular shape, and other shapes.

[0055]

According to the vibration method and apparatus for pouring concrete for a tunnel according to the present invention, after pouring concrete between the formwork and the inner wall surface of the tunnel, the guide portion is rotated and supported. The vibrating tool that was made to project to the outside of the form,
It is inserted into the placed concrete, the concrete is compacted by the vibration of this vibrating tool, and the tip surface of the vibrating tool is made flush with the outer peripheral surface of the formwork when the vibrating tool is stored. It is possible to greatly reduce the total moving distance of the vibrating tool in manual vibration work.
It is sufficient to move the vibrating tool in and out of the mold, and the work can be performed easily and safely.

Further, since the front end surface of the vibrating tool closes the vibrating tool inlet / outlet of the mold when the vibrating tool is stored, it is possible to prevent the poured concrete from invading the inside of the mold, and the vibrating tool as in the conventional case. It is possible to eliminate the work of opening and closing the inspection window for moving in and out.

Further, even when concrete is placed up to the vicinity of the vibrating tool projecting portion, the vibrating tool can be vibrated as it is, and the placing concrete near the vibrating tool projecting portion can also be vibrated. Work efficiency is significantly improved.

Even when the vibrating vibrating tool is in contact with the outer peripheral edge of the vibrating tool projecting portion of the form, since the rotation of the vibrating tool is controlled, the turning force of the vibrating tool applied to the operator is drastically reduced. However, the rotation caused by the vibration of the vibrating tool is transmitted to the power cord, and the power cord does not come off the socket.
It does not hinder work.

Further, the rotation control means of the vibrating tool in the guide portion is fitted on the outer peripheral edge of the vibrating tool, and has a cleat inside the vibrating tool and in contact with the vibrating tool when the vibrating tool vibrates outside. By using the control members formed by arranging the control protrusions that come into contact with the guide portions, the structure becomes simple and the maintenance becomes extremely easy.

Further, the first support plate and the second support plate are arranged at a predetermined distance in the guide portion, and the shape of the vibrating tool is obtained by the contact of the control member fitted in the vibrating tool with both the support plates. By controlling the entrance / exit length (moving distance) with respect to the frame, the moving distance of the vibrating tool can be further shortened, and the workability can be further improved.

Further, by disposing a guide tool having a taper portion that widens toward the inside of the mold at the vibrator projecting portion of the mold, the contact area between the mold and the vibrator is reduced. It is possible to reduce frictional resistance and improve the storage of the vibrating tool.

[Brief description of drawings]

FIG. 1 is an enlarged front view of essential parts of a vibrating device for a concrete poured into a tunnel according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an enlarged plan view of rotation control means.

FIG. 4 is a plan view showing a guide tool, and FIG.

FIG. 5 is a front view showing concrete pouring and vibrating work.

[Explanation of symbols]

12 formwork 14 tunnels 16 concrete 18 Vibrator entrance 20 Information Department 22 Rotation control means 24 vibrating tool 32 First support plate 34 Second support plate 36 non-slip 38 Control protrusion 40 taper 42 Guide 46 Wall surface inside the tunnel

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Claims (8)

[Claims] 1. A formwork in the step of placing concrete (16) for lining in a tunnel (14) using the formwork (12).
After placing concrete (16) between (12) and the inner wall surface (46) of the tunnel, the vibrating tool (24) supported by rotating the guide (20) inside the formwork (12). Project outside the formwork (12) and insert it into the placed concrete (16).
The concrete (16) is vibrated by the
After compacting 6), the vibrating tool (24) is housed inside the mold (12), and the tip surface of the vibrating tool (24) is flush with the outer peripheral surface of the mold (12). Method for vibrating cast concrete for tunnels. 2. The inward sliding contact with the vibrating tool (24), wherein the rotation control means (22) of the vibrating tool (24) in the guide portion (20) is fitted into the outer peripheral edge of the vibrating tool (24). The control member has a stopper (36) and a control protrusion (38) which is not in contact with the vibrating tool (24) and contacts the guide section (20) when the vibrating tool (24) vibrates. The method for vibrating the concrete for tunneling according to claim 1. 3. A vibrating tool (24) in which a first supporting plate (32) and a second supporting plate (34) are arranged in the guide portion (20) at a predetermined distance.
The length in and out of the form (12) of the vibrating tool (24) is controlled by abutting the support members (32) and (34) of the control member fitted in the base plate. Method of concrete pouring for concrete tunnel. 4. The mold (12) is attached to the vibrating tool protruding portion of the mold (12).
A guide with a taper (40) that widens inward
2. The method according to claim 1, further comprising: (42) for reducing a contact area between the mold (12) and the vibrating tool (24), reducing frictional resistance, and improving storability. The method for vibrating a cast concrete for a tunnel according to claim 2 or claim 3. 5. Formwork for placing concrete (16)
Guide part (20) provided inside the vibrating tool entrance / exit (18) of (12)
In addition, the vibrator (24) is supported by being rotationally controlled, and can be freely moved in and out from the vibrator entrance (18) .When the vibrator (24) is stored, the tip end surface of the vibrator (24) is fixed to the form (12). ) A vibrating device for pouring concrete for tunnels, characterized in that it is flush with the outer peripheral surface. 6. A sliding control member (22) for the vibrating tool (24) in the guide section (20) is fitted to the outer peripheral edge of the vibrating tool (24) and slides inwardly in contact with the vibrating tool (24). The control member has a stopper (36) and a control protrusion (38) which is not in contact with the vibrating tool (24) and contacts the guide section (20) when the vibrating tool (24) vibrates. The vibrator for cast concrete for tunnel according to claim 5. 7. A vibrating tool (24) in which a first support plate (32) and a second support plate (34) are arranged in the guide portion (20) at a predetermined distance.
7. The length of the vibrating tool (24) moving in and out of the form (12) is controlled by abutting the support member (32), (34) fitted into the control member on the supporting member (32), (34). Vibrating equipment for concrete pouring for tunnels. 8. The formwork (1) is attached to the vibrating tool inlet / outlet (18) of the formwork (12).
2) A guide tool (42) having a taper part (40) that widens toward the inside is arranged to reduce the contact area between the formwork (12) and the vibrating tool (24) and reduce frictional resistance. The vibrating device for pouring concrete for a tunnel according to claim 5, 6 or 7, characterized in that the storability is improved.