JP2012007351A - Concrete filling detector and concrete filling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete filling detector and a concrete filling device by which a concrete filling state can be detected accurately and in a reliable manner in pouring concrete in a gap between the inner wall surface of a tunnel and a formwork, even with a simple and low-cost structure.SOLUTION: A concrete filling detector comprises a cylindrical hollow member 100 (120) disposed with the tip projecting from a formwork 20 to the side of a concrete poured section, and a concrete filling sensor 200 installed on the outside of a hollow member tip (120A) side. The inside and outside of the formwork 20 are communicated through a hollow section 128 in the cylindrical hollow member 100 (120).

Description

  The present invention relates to a technique for detecting a filling state of concrete when placing. Moreover, it is related with the technique which lays concrete using the said technique.

  For example, as one of the tunnel lining methods, a centle (movable formwork made of steel that can be foldable) installed movably in an excavated tunnel is used, and the gap between the tunnel inner wall surface and the centle is used. Place lining concrete, and after placing the lining concrete, move the centle sequentially to the place adjacent to the place where the lining concrete is placed, and cover the gap between the tunnel inner wall surface and the centle. There has been known a method in which concrete is repeatedly placed (see FIGS. 5 and 6).

  However, in the tunnel lining method as described above, when lining concrete is placed in the gap between the tunnel inner wall surface and the formwork (centre), the gap cannot be satisfactorily filled with concrete. There is a fear.

  If the concrete is insufficiently filled, the thickness of the concrete will be unbalanced and the strength will be reduced, so the concrete will be filled well with the above gap to ensure a uniform thickness with little variation. Is essential.

  However, since the gap is on the outer periphery of the formwork (centre) when viewed from the tunnel passage side, it is filled with concrete, so whether or not the concrete can be satisfactorily filled by visual observation or the like. There is a fact that it cannot be confirmed.

  It should be noted that filling concrete that has been hardened to some extent so that it may be replenished afterwards in an insufficient filling location is between the concrete placed first and the concrete replenished later. Since the boundary surface is formed on the surface, it is easy to become a starting point for cracks, peeling, etc., so it should be avoided to place concrete several times on the same location. It is necessary to be able to fill concrete well.

  For this reason, for example, in Patent Document 1, a concrete state measurement sensor is arranged along the inner wall surface of the arch portion of the tunnel, and the gap between the inner wall surface of the tunnel and the formwork is arranged. It describes what can measure the filling state of concrete during concrete placement.

JP 2002-207021 A

  As shown in FIG. 5, the technique described in Patent Document 1 is a method for attaching a relatively expensive concrete state measuring sensor to a tunnel inner wall surface. Since it cannot remove, cost will increase. In particular, when the tunnel length is long, the cost is enormous.

  Further, as illustrated in FIG. 6, the concrete 3 is sprayed relatively thinly on the surface of the natural ground 2 side in order to suppress cracking or collapse of the surface of the natural ground 2 side. And the waterproof sheet 4 is arrange | positioned in the tunnel 1 side of the shotcrete 3 in order to suppress the permeation of the water into the tunnel 1 from the natural mountain 2 side.

  Since the surface of the shotcrete 3 has some unevenness corresponding to the surface of the natural ground 2, the concrete filled in the gap 5 is filled so as to follow the unevenness when placing the concrete. At that time, the waterproof sheet 4 is disposed with a relatively large looseness (allowance, slack, slack, etc.) so that the waterproof sheet 4 is not torn and for ease of construction. is there.

  For this reason, when the gap 5 is filled with concrete, the waterproof sheet 4 is partially overlapped with each other due to wrinkles or bending, and the concrete state measuring sensor as shown in FIG. 5 is used. In some cases, troubles such as disconnection and short circuit may occur.

  Further, as shown in FIG. 6, the concrete is filled from the concrete supply pipe 30 into the gap 5, but the peephole is formed from the unplaced portion of the concrete in the longitudinal direction of the tunnel (that is, the direction substantially perpendicular to the plane of FIG. 6). For example, an operator visually confirms the situation.

  However, this method requires visual confirmation in a situation where the work environment is not good, such as work in a high place and a narrow place. However, since skill of workers is also required, there is a situation that efficient concrete placement work cannot be performed.

  The present invention has been made in view of such circumstances, and while placing the concrete in the gap between the inner wall surface of the tunnel and the formwork with a simple and inexpensive configuration, the filling state of the concrete is accurate. It is another object of the present invention to provide a concrete filling detection device and a concrete filling device that can detect with high reliability.

The concrete filling detection device according to the present invention is:
A cylindrical hollow member whose tip protrudes from the mold to the concrete placement part side;
A concrete filling sensor attached to the outside of the hollow member tip side;
Comprising
The inside and outside of the mold are communicated with each other through a hollow portion of the cylindrical hollow member.

  The communication between the inside and the outside of the mold is made by, for example, the air hole 122, the side opening 125, the communication passage 126, the center opening 128, and the like. It is possible to visually check the concrete filling, and further to perform the concrete filling from the outside of the formwork.

  In the present invention, a side opening is formed at a position different from the concrete filling sensor in a circumferential direction, and the side opening is communicated with the hollow portion. It can be.

  In the present invention, a concrete supply pipe inserted into the hollow portion may be connected to the side opening.

  In the present invention, an air passage communicating with the hollow portion may be provided separately from the side opening.

  In the present invention, it is possible to adjust the amount of protrusion from the mold at the tip of the cylindrical hollow member to the concrete placing part side.

  In the present invention, wirings of the concrete filling sensor may be led out to the outside through the hollow portion.

  The mold may be an arch-shaped mold used for placing tunnel lining concrete.

The concrete filling apparatus according to the present invention includes:
A cylindrical hollow member whose tip protrudes from the mold to the concrete placement part side;
A concrete filling sensor attached to the outside of the hollow member tip side;
Comprising
Concrete is filled from the outside of the formwork into the concrete placing portion through the hollow portion of the cylindrical hollow member while confirming the concrete filling state by the concrete filling sensor.

  In the concrete filling apparatus according to the present invention, a side opening is formed at a position different from the concrete filling sensor in the circumferential direction, and the side opening is communicated with the hollow portion. In addition, a concrete supply pipe inserted through the hollow portion may be connected to the side opening.

  According to the present invention, the concrete filling state can be detected with high accuracy and reliability when placing concrete in the gap between the inner wall surface of the tunnel and the formwork with a simple and inexpensive configuration. It is possible to provide a concrete filling detection device and a concrete filling device that can perform the above-described operation.

It is sectional drawing which shows schematically the concrete filling detection system in the tunnel which concerns on one Embodiment of this invention. It is a fragmentary sectional view which shows the structure of the test | inspection pin used for the concrete filling detection system which concerns on embodiment same as the above in a partial cross section. It is a fragmentary sectional view which expands and shows the structure of the front-end | tip part of the test | inspection pin which concerns on embodiment same as the above in a partial cross section. It is a figure which shows another example of the example of arrangement | positioning of a concrete supply pipe | tube and an inspection pin. It is a figure for demonstrating an example of the system which stuck the conventional concrete state measurement sensor on the tunnel arch part, and detected the concrete filling state at the time of placement. It is sectional drawing which shows an example of the conventional placement method of tunnel lining concrete.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the accompanying drawings. The present invention is not limited to the embodiments described below.

  FIG. 1 is a cross-sectional view schematically showing a use state of a lining concrete filling detection system (apparatus) in a tunnel according to an embodiment of the present invention, and FIGS. 2 and 3 are used in the filling detection system. It is sectional drawing which shows the structure of the test | inspection pin 100 in a partial cross section.

  The concrete filling detection device (system) according to the present embodiment is used when placing tunnel-filled concrete. As shown in FIG. 1, the tunnel 1 is excavated in the present embodiment as in the prior art. A sprayed concrete 3 and a waterproof sheet 4 are disposed on the surface of the natural ground 2.

  In the present embodiment, a centle (steel mobile formwork) 21 that is movably installed in the tunnel 1 is disposed as in the prior art, and the inner wall surface (waterproof sheet 4) of the tunnel 1 is arranged. Concrete is filled in the space 5 between the mold 21 via the concrete supply pipe 30.

Here, in this embodiment, an inspection pin 100 as shown in FIG. 2 is used.
As shown in FIG. 1, the inspection pin 100 penetrates the mold 20, is radially projected toward the ground 2, and is extended in the gap 5 until it almost reaches the tunnel inner wall surface (waterproof sheet 4). A plurality are arranged.

  More specifically, as shown in FIG. 2, the inspection pin 100 includes a hollow cylindrical base end side tapered cylindrical portion 110 inserted through the flange 21 of the mold 20 and a base end side tapered cylindrical portion. 110 and a distal end side pipe 120 inserted through the hollow portion of 110.

  The proximal-side tapered cylindrical portion 110 is fitted into the inner opening of the flange 21 and is fixed to the flange 21 by the fixing bolt 22.

  Further, the distal end side pipe 120 is fitted into the hollow opening of the proximal end side tapered cylindrical portion 110 and is fixed to the distal end side pipe 120 by the fixing bolt 23.

  Accordingly, the proximal-side tapered cylindrical portion 110 is configured to be adjustable by changing the fixing position of the fixing bolt 22 with respect to the longitudinal direction of the flange portion 21 and the relative position with respect to the mold 20. .

  Further, the distal end side pipe 120 is configured such that the relative position with respect to the proximal end side tapered cylindrical portion 110 in the longitudinal direction can be adjusted by changing the fixing position of the fixing bolt 23.

  For this reason, the protrusion amount of the tip of the tip side pipe 120 from the mold 20 can be adjusted, and when the mold 20 is installed in the tunnel 1, by changing the fixing position of the fixing bolts 22 and 23, The inside of the gap 5 can be extended until the tip of the tip side pipe 120 (inspection pin 100) reaches the inner wall surface of the tunnel (waterproof sheet 4).

  Note that a lubricant such as grease can be applied between the proximal-side tapered cylindrical portion 110 and the flange 21 and between the proximal-side tapered cylindrical portion 110 and the distal-end pipe 120. Therefore, good sealing performance and sliding performance can be exhibited.

  As shown in FIG. 3, the distal end portion of the distal end side pipe 120 of the inspection pipe 100 according to the present embodiment includes a distal end portion 120A having a narrow distal end side, and a hollow pipe portion 120B attached to the proximal end side of the distal end portion 120, It is comprised including. The hollow pipe portion 120B corresponds to a cylindrical hollow member according to the present invention. The cylindrical cross-sectional shape is not limited to a circular shape, and may be a polygonal shape or an elliptical shape.

  The front end surface 121 of the front end portion 120A is provided with an air hole 122 and a bolt hole 123, and is engraved with a sensor housing portion 124 that is a recess for housing the concrete filling sensor 200 (FIG. 3 (see arrow a).

  The air hole 122 functions as an air passage according to the present invention, and penetrates the front end portion 120A to the central opening 128 of the hollow pipe portion 120B (corresponding to the hollow portion of the cylindrical hollow member according to the present invention). It is communicated to. The air hole 122 functions as an air outlet from the gap 5 when the gap 5 is filled with concrete. That is, in order to cope with a change in volume of the gap 5, the communication hole communicates the outside (the gap 5 side) and the inside (the tunnel 1 side) of the mold 20.

  Moreover, as shown to (A) of FIG. 3, the bolt 123 (A hexagon bolt, a hexagon socket head bolt, etc.) 123A is attached to the bolt hole 123 so that it may protrude from the front end surface 121. FIG. The protrusion of the bolt 123A can suppress the possibility that the air hole 122 is blocked by the waterproof sheet 4, and contributes to making the air hole 122 function as an air vent hole reliably.

  Here, a concrete filling sensor 200 capable of detecting whether or not concrete is filled in the vicinity of the sensor accommodating portion 124 is disposed. As the concrete filling sensor 200, for example, a vibration device is used. A concrete filling detection system can be used.

  As this type of device, a concrete filling detection system “Jutetender CIFD-3” manufactured by Akebono Brake Industry Co., Ltd. can be used (see Japanese Patent Application Laid-Open No. 2003-194615).

  It is possible to clearly distinguish whether there is air (concrete unfilled part), incomplete filling (bleeding water, etc.) or concrete (mortar) in the vicinity of the sensor. ing. Breeding is a phenomenon in which a material with high specific gravity (sand or cement) sinks down after concrete placement and light water (supernatant) rises to the surface. Light water (supernatant) is called bleeding water. .

  Moreover, as the concrete filling sensor 200, a sensor using a strain gauge transducer can be employed. For example, a concrete filling sensor (model number: KZA-1A / -1B / -1C) manufactured by Tokyo Sokki Kenkyujo Co., Ltd. can be used.

  This is because when the sensor is in contact with fresh concrete, a voltage is applied to the electrode of the sensor to accumulate charges due to the movement of ions present in the free water inside the fresh concrete, and then the voltage application is stopped. By measuring the residual voltage during the discharge process, it is possible to distinguish and detect the presence of fresh concrete, bleeding water, air, and the like.

  Note that the wiring of the concrete filling sensor 200 can be safely externally connected to the outside through the cable hole 127 that passes through the tip 120A and communicates with the central opening 128 of the hollow pipe 120B (measurement device). Etc.).

  As described above, according to the present embodiment, the concrete filling sensor is provided in the sensor housing portion 124 of the distal end portion 120A of the inspection pipe 100 that extends through the gap 5 and reaches the natural ground 2 (such as the waterproof sheet 4). Since 200 is attached, it is possible to accurately detect whether or not concrete has been satisfactorily filled into the outermost peripheral side (near the waterproof sheet 4) of the gap 5 where space or the like is likely to be generated.

  In addition, a side opening 125 that opens toward the side is provided on the opposite side of the sensor housing portion 124 of the tip 120A of the inspection pipe 100 according to the present embodiment. Is connected to a communication passage 126 communicating with the central opening 128 of the hollow pipe portion 120B.

  For this reason, it is possible to discharge bleeding water, which is an unnecessary material, through the side opening 125, the communication passage 126, and the central opening 128, and that the filled concrete is discharged from here. By confirming, it is possible to confirm the filling of the concrete by visual inspection. Note that the same confirmation can be made through the air holes 122.

  In addition, after bleeding water is discharged | emitted, it is also possible to suppress the outflow of concrete etc. more than necessary by screwing the mechlet lid threaded by the outer periphery to the communicating path 126.

  Furthermore, in the present embodiment, a concrete supply pipe 300 as shown in FIG. 3 can be screwed and connected to the communication path 126.

  By connecting a concrete supply hose or the like from a concrete supply unit or the like to the base end side of the concrete supply pipe 300, the outermost peripheral side of the gap 5 where space or the like is likely to be generated through the side opening 125 ( It is also possible to fill concrete in the vicinity of the waterproof sheet 4).

  That is, for example, when concrete filling cannot be confirmed by the concrete filling sensor 200, the concrete is supplied through the side opening 125 because there is space or bleeding water in the vicinity of the concrete filling sensor 200. Thus, it is possible to fill the concrete while discharging air or bridging water through the air holes 122 or the like.

  In such a case, a check valve (one-way valve) that permits the supply of concrete and restricts the flow in the reverse direction is provided in the vicinity of the side opening 125 to prevent backflow and the like. It is possible to reliably fill the gap 5 with a predetermined pressure.

  In addition, the air hole 122 is not limited to a circular shape, and may be a shape in which concrete is not easily clogged, for example, an elliptical shape or a slit shape.

  Thus, in the present embodiment, when concrete is placed in the gap 5 between the inner wall surface of the tunnel and the formwork 20, the concrete filling state is determined by the concrete filling sensor 200 attached to the tip of the inspection pin 100. Since concrete can be placed while confirming in real time, it is not necessary to perform visual confirmation as in the prior art, so that concrete can be reliably and reliably filled into the gap by a small number of workers.

  And since this inspection pin 100 can be pulled out and reused, low-cost construction can be realized. In addition, since the taper is formed in the outer periphery of the base end side taper cylindrical part 110 of the test | inspection pin 100, extraction is easy.

  In addition, when trouble occurs in the concrete filling sensor 200, the substance flowing out through the side opening 125 (or the air hole 122), the communication passage 126, and the central opening 128 is observed depending on the situation. Therefore, since the concrete can be placed while visually checking the concrete filling state in real time, it is possible to provide a concrete filling system that can respond quickly to changes in the situation and is excellent in usability.

  Furthermore, according to the present embodiment, concrete can be filled through the side opening 125, the communication path 126, and the concrete supply pipe 300.

  For this reason, according to the present embodiment, when the concrete filling sensor 200 detects that there is a space even though the filling has progressed to some extent, it can be visually confirmed and the side opening of the inspection pin 100 can be confirmed. Since the concrete can be immediately filled into the corresponding place via 125 etc., inefficient work such as concrete reworking can be avoided, increase in construction cost, extension of construction period, etc. are suppressed, Highly reliable construction can be provided.

  In other words, according to the present embodiment, when it becomes impossible to sufficiently fill the concrete during the concrete placement, it can be detected at an early stage and the concrete will be hardened. It is possible to take countermeasures as soon as possible, and thus contribute to the improvement of quality as a concrete structure.

In this embodiment, since the side opening 125 is provided on the back side of the concrete filling sensor 200, the concrete supplied from the side opening 125 even when the concrete is supplied from the side opening 125. By directly touching the concrete filling sensor 200, it is possible to avoid the possibility of erroneous detection of filling even when the gap 5 has not been filled yet. Yes.
For example, it is possible to arrange the concrete filling sensor 200 upward and the side openings 125 downward. In addition,

  However, the arrangement position of the side opening 125 is not limited to the back surface of the concrete filling sensor 200, and the side opening 125 may be provided at a position different from the concrete filling sensor 200 in the circumferential direction. is there.

  By the way, when using the inspection pin 100 according to the present embodiment, it is possible to omit the concrete supply pipe 30 shown in FIG. 1 and supply concrete from the inspection pin 100.

  Also in the present embodiment, in order to ensure filling of the concrete into the uppermost part of the tunnel 1 and the like, the longitudinal direction of the tunnel 1 is different from the cross section in FIG. 1, for example, as shown in FIG. Each element can also be arranged.

  Further, in the present embodiment, the placement of the lining concrete in the tunnel has been described as a representative, but the present invention is not limited to this, and in the placement of concrete in other concrete structures. Applicable.

  The embodiment described above is merely an example for explaining the present invention, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Tunnel 2 Ground mountain 3 Shotcrete 4 Waterproof sheet 5 Air gap 20 Formwork (centre)
DESCRIPTION OF SYMBOLS 21 Flange 22 Fixing bolt 23 Fixing bolt 30 Concrete supply pipe 100 Inspection pin 110 Base end side taper cylindrical part 120 End side pipe 120A End part 120B Hollow pipe part 121 End surface 122 Air hole 123 Bolt hole 123A Hexagon bolt etc. 124 Sensor housing part 125 Side opening part 126 Communication path 127 Cable hole 128 Central opening part 200 Concrete filling sensor 300 Concrete supply pipe

Claims (9)

A cylindrical hollow member whose tip protrudes from the mold to the concrete placement part side;
A concrete filling sensor attached to the outside of the hollow member tip side;
Comprising
A concrete filling detection apparatus, wherein an inner side and an outer side of a formwork communicate with each other through a hollow portion of the cylindrical hollow member.   The side opening is formed at a position different from the concrete filling sensor in a circumferential direction, and the side opening is communicated with the hollow portion. The concrete filling detection apparatus according to 1.   The concrete filling detection device according to claim 1 or 2, wherein a concrete supply pipe inserted through the hollow portion is connected to the side opening.   The concrete filling detection apparatus according to any one of claims 1 to 3, wherein an air passage communicating with the hollow portion is provided separately from the side opening.   The concrete filling detection device according to any one of claims 1 to 4, wherein an amount of protrusion of the cylindrical hollow member from the mold at the tip to the concrete placement portion side is adjustable. .   The concrete filling detection device according to claim 1, wherein wiring of the concrete filling sensor is led out through the hollow portion.   The concrete filling detection device according to any one of claims 1 to 6, wherein the formwork is an arch-like formwork used for placing tunnel lining concrete. A cylindrical hollow member whose tip protrudes from the mold to the concrete placement part side;
A concrete filling sensor attached to the outside of the hollow member tip side;
Comprising
A concrete filling apparatus, wherein concrete is filled from the outside of a formwork into a concrete placing portion through a hollow portion of the cylindrical hollow member while confirming a concrete filling state by the concrete filling sensor.   A side opening is formed at a position different from the concrete filling sensor in the circumferential direction, and the side opening is communicated with the hollow portion. The side opening is connected to the side opening. The concrete filling apparatus according to claim 8, wherein a concrete supply pipe inserted into the hollow portion is connected.

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