JP2006192841A - Vibration compaction apparatus for concrete in closed space and vibration compaction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration compaction apparatus widely applicable to concrete placing for closed spaces having a variety of largeness, not to mention that it contributes labor saving, and to provide a vibration compaction method. <P>SOLUTION: The vibration compaction apparatus 10 which is equipped with a concrete placing pipe 11 whose upper end part is connected to a concrete placing hose 4 and whose lower end part is inserted in the closed space A of a steel shell structure 1; a plurality of telescopic support arms 14 whose base end parts are attached, in the upper end side of this concrete placing pipe 11, to the axis so that it can be swayed around the axis; and vibrator main bodies 15 which are installed in the tip parts of the support arms, through cables 22, so as to hang down and inserted in the closed space A through the insert openings 3 that have beforehand been formed in the steel shell structure 1 is inserted in the closed space A, and, while monitoring the packing height with two sensors 28 fitted to the vibrator main bodies 15, the vibration compaction apparatus 10 is raised each by a predetermined distance, and the pouring of concrete C and the application of vibration by the vibrator main bodies 15 are conducted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vibration compaction device for vibration compaction of concrete filled in a closed space of a structure, and a vibration compaction method for concrete in a closed space performed using the vibration compaction device.

  For example, the floor slab and side wall of the submerged box have a composite structure in which concrete is cast in a closed space of a steel shell structure formed of a steel plate. And in manufacturing such a floor slab and a side wall, since concrete is filled in the closed space which cannot be visually observed from the outside, how to perform the filling surely and efficiently becomes an important subject. Therefore, for example, in the construction method described in Patent Document 1, medium-flowing concrete with a slump flow of 30 to 55 cm is selected as concrete, and a vibrator is inserted into the closed space, and the concrete is put into the closed space while being vibrated by the vibrator. I try to fill it.

  By the way, the enclosed space in the steel shell structure used as the floor slab and side wall of the submerged box is quite large (for example, 3m square and 1m in height). In order to apply vibration to concrete in the space, it is necessary to prepare multiple vibrators and operate each vibrator at the same time. It was.

For example, Patent Literature 2 discloses a compacting device in which a turning frame is attached to a tip pipe connected to the tip of a concrete placing hose so as to be turnable, and a plurality of vibrators are supported on the turn frame. Therefore, it is conceivable to use such a compacting device for placing concrete in the enclosed space.
JP 2000-355010 A JP-A-7-54337

  However, in order to apply the compacting device described in Patent Document 2 to a closed space, an insertion port for inserting a vibrator is previously formed in a structure (steel shell structure or the like) having a closed space. It is necessary to keep. In this case, since the size and shape of the closed space are not necessarily uniform, the positions of the insertion holes previously drilled in the structure are also difficult. However, since the position of the vibrator is constant in the compacting device, a dedicated compacting device must be prepared each time the position of the insertion port on the structure side is changed, which is costly. An increase is inevitable.

  The present invention has been made in view of the above-described technical background, and the subject of the present invention is not only contributing to labor saving, but can be generally used for placing concrete in closed spaces of various sizes. It is an object of the present invention to provide a vibration compaction apparatus that can perform vibration compaction efficiently and reliably by operating the vibration compaction apparatus.

  In order to solve the above-described problems, a concrete vibration compaction apparatus in a closed space according to the present invention includes a concrete placing pipe having an upper end connected to a concrete placing hose and a lower end inserted into the closed space of the structure. A plurality of extendable support arms having a base end pivotally attached to an upper end side of the concrete placing pipe so as to be swingable around the axis, and suspended from a distal end portion of the support arm; A vibrator main body (vibrating portion) inserted into a closed space through an insertion port formed in advance in the body, expansion / contraction restriction means for restricting expansion / contraction of the support arm, and oscillation regulation means for regulating oscillation of the support arm. It is characterized by having.

  The concrete vibration compaction apparatus in the closed space configured as described above includes a plurality of vibrator main bodies, so that vibration compaction can be performed at multiple points at a time. Moreover, the position of the rod-shaped vibrator main body can be adjusted according to the insertion opening previously provided in the structure by swinging and extending and contracting each support arm.

  In the present invention, it is desirable that the plurality of support arms be radially arranged around a swing fulcrum set equally arranged in the circumferential direction of the concrete placement pipe, whereby the concrete placement The support arm can be extended in multiple directions around the axis around the tube, and the vibrator main body can be inserted into a wide range of insertion ports. In this case, four support arms are provided, and each support arm can be swung within a range of 90 degrees, so that it can be inserted into an insertion port in a range of approximately 360 degrees around the concrete placing pipe. A vibrator main body can be inserted.

  Further, the vibration compaction method of concrete in the closed space performed using the above-described vibration compaction device is based on a signal from a sensor that detects the filling height of the concrete in the closed space. And controlling the operation of the vibrator body while controlling the insertion height of the vibration compaction device into the closed space.

  In the concrete vibration compaction method in the closed space thus performed, the insertion height of the vibration compaction device into the closed space is controlled based on a signal from a sensor for detecting the concrete filling height. By controlling the operation of the vibrator body, vibration compaction can be centrally managed. In this case, a sensor for detecting the filling height of the concrete may be attached to each vibrator body. In this case, in addition to saving the trouble of separately installing the sensor in the closed space, the sensor can be reused. It becomes possible.

  According to the vibration compaction apparatus for concrete in a closed space according to the present invention, since a plurality of vibrator compactions can be performed at once by a plurality of vibrator bodies, labor saving can be achieved. In addition, since the position of the vibrator main body can be adjusted in accordance with the insertion opening provided in advance in the structure, it can be used in general for closed spaces of various sizes and shapes.

  Further, according to the vibration compaction method for concrete in a closed space according to the present invention, vibration compaction can be centrally managed based on a signal from a sensor that detects the concrete filling height. The concrete can be reliably filled and compacted, and the reliability of the construction method is remarkably improved.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  1 to 3 show the overall structure of a concrete vibration compaction apparatus in a closed space according to one embodiment of the present invention. In these figures, reference numeral 1 denotes a steel shell structure (structural body) for a sinking box having a closed space A therein, and a concrete casting placement port 2 is provided near the center of the upper plate 1a. An insertion port 3 for inserting a vibrator main body 15 to be described later is previously drilled in the vicinity of the four corners of the same upper plate 1a. The vibration compaction device 10 has an upper end connected to the concrete placement hose 4 and a lower end side inserted into the closed space A through the placement port 2 and a concrete placement tube 11 around the concrete placement tube 11. Four support arms 14 that are radially arranged and whose base end portions are axially attached using a pin 13 to a pair of upper and lower flange plates 12 that are fitted to the upper end side of the concrete placing pipe 11, and each support arm 14. And a vibrator main body 15 that is inserted into the closed space A through the insertion port 3.

  Each support arm 14 is extended from a handle member 17 fixed to an upper end portion of the concrete placing pipe (hereinafter simply referred to as a placing pipe) 11 to a hanging metal fitting 16 provided at an intermediate portion in the longitudinal direction. By hanging the stay wire 18, a posture substantially orthogonal to the axis of the placing tube 11 is maintained. That is, each support arm 14 swings about the pin 13 in a plane orthogonal to the axis of the placing tube 11, and the tip position of each support arm 14, that is, the droop of the vibrator main body 15, according to this swing. The installation position is displaced in the circumferential direction around the placement tube 11. Each support arm 14 is also composed of two hollow frames 19 and 20 that are stretchably coupled, and one hollow frame (fixed frame) 19 having a larger hollow cross section is driven using the pin 13. It is pivotally attached to a flange plate 12 integral with the tube 11 and supported by the placing tube 11 using the stay wire 18. The other hollow frame (movable frame) 20 of the support arm 14 is slidably fitted into the fixed frame 19, and according to the expansion and contraction of the movable frame 20 with respect to the fixed frame 19, the tip position of the support arm 14, that is, The vertically extending position of the vibrator main body 15 is displaced in the radial direction around the placing tube 11. The means for adjusting the expansion / contraction amount of the support arm 14 and restricting the expansion / contraction will be described in detail later.

  In the present embodiment, the pins 13 that are the swing fulcrum of each support arm 14 are set equally (at intervals of 90 degrees) in the circumferential direction of the placement tube 11, and the swing of each support arm 14 is also set. The range is set to a range of about 90 degrees with the pin 13 as a fulcrum. The means for setting the swing range of the support arm 14 and restricting the swing will be described in detail later. As a result, the movable range of the tip of each support arm 14 (arm tip) is shown in FIG. 4 with dotted hatching, and the arc trajectory and swing of the arm tip at the shortened end and the extended end of the movable frame 20 are shown. A sector area S surrounded by a center line passing through the fulcrum (pin 13) is formed. In this case, the fan-shaped regions S are set for the four support arms 14 respectively, and therefore, a range of approximately 360 degrees around the placing tube 11 is movable within the arm tip, that is, the vibrator main body 15 can be suspended. It becomes a range. Here, the blank portion between the fan-shaped regions S shown in FIG. 4 is a range where the arm tip does not reach (non-movable range), but the placement tube for the placement port 2 of the steel shell structure 1 By appropriately changing the insertion position (rotation angle) of 11, this non-movable range also becomes the movable range of the arm tip. As a result, the entire circumferential range (360 ° range) surrounding the placing tube 11 is a range in which the vibrator body 15 can be suspended, and no matter where the insertion port 3 is drilled, the support arm 14 can be The vibrator body 15 can be inserted into the insertion port 3 by appropriately adjusting the swing angle and the amount of expansion / contraction.

  On the other hand, the vibrator device 21 including each vibrator main body 15 includes a flexible protective hose 22 that covers a cable connected to the vibrator main body 15, and a power source that connects the cable in the protective hose 22 and the inverter 23. It comprises a cable 24, a switch 25 interposed at the connection point of the cable, and a vibrator control device 26 that controls the operation of the vibrator main body 15 through the inverter 23. In this embodiment, the protective hose 22 connected to each vibrator main body 15 is detachably supported by a plurality of hose fixing devices 27 described later provided on the lower surface of each support arm 14, and the hose fixing device 27 By changing the fixing position of the protective hose 22, the hanging height of the vibrator main body 15 from the support arm 14 can be arbitrarily changed. The protective hose 22 of each vibrator main body 15 is guided around the placing tube 11 by the hose fixing device 27 at the other end, and is pulled out to the inverter 23 side in a bundled state.

  In the present embodiment, two vibrators 28 (28a, 28b) that detect the filling height of the concrete into the closed space A are attached to each vibrator body 15 at a predetermined interval. The sensor 28 is composed of a vibration device including piezoelectric ceramics, and has a function of detecting contact with concrete from a change in peak output when the concrete contacts with this. Each sensor 28 is connected to a signal processing device 30 via a cable 29, and the signal processing device 30 is connected to the vibrator control device 26. A system including the sensor 28 and the signal processing device 30 is commercially available from Akebono Brake Industry Co., Ltd. under the name “Jutetender”. In the present embodiment, of the two sensors 28, one sensor 28 a is attached to the distal end side of the vibrator body 15, and the other sensor 28 b is attached to a substantially intermediate position of the vibrator body 15. Each cable 29 is drawn out to the signal processing device 30 side using a hose fixing device 27 under the support arm 14 that supports the vibrator main body 15.

  Here, the means for adjusting the expansion / contraction amount of each support arm 14 and restricting the expansion / contraction (extension restriction means) is formed so as to penetrate the side surface of the distal end portion of the fixed frame 19 as shown in FIG. One engagement hole 31, a plurality of positioning holes 32 arranged in the longitudinal direction on the side surface of the movable frame 20 and penetrating at a predetermined pitch can be fastened through the engagement holes 31 and the positioning holes 32. Bolts and nuts 33. In this expansion and contraction restricting means, one of the plurality of positioning holes 32 formed in the movable frame 20 is selected, and this is aligned with the engagement hole 31 of the fixed frame 19, and in this state, through both holes 31 and 32. If the bolts and nuts 33 are tightened, the position of the movable arm 20 is fixed with respect to the fixed arm 19, and the expansion / contraction amount (full length) of the support arm 14 is adjusted.

  In addition, as shown in FIG. 5 to FIG. 7, means (swing restricting means) for setting the swing range of each support arm 14 and restricting the swing are provided on the pair of upper and lower flange plates 12. It comprises a pair of arc grooves 35 formed on the pitch circle centered on the pin 13 as a moving fulcrum and bolts and nuts 36 that can be fastened through the arc grooves 35. In this swing regulating means, the diameter of the pitch circle is set so that the bolt portions of the bolts and nuts 36 are always in contact with both side surfaces of the support arm 14, so that the bolts and nuts 36 are loosened. The bolt / nut 36 moves in the arc groove 35 following the swing of the support arm 14. In this case, the support arm 14 has a swing end where the bolt / nut 36 reaches the groove end of the arc groove 35. Here, the arc length of the arc groove 35 is set so that each support arm 14 can swing 90 degrees. Is set. On the other hand, the swing of the support arm 14 is restricted by tightening the bolt / nut 36, and therefore, the support arm 14 can be fixed at an arbitrary angular position in the range of 90 degrees. Yes.

  On the other hand, each hose fixing device 27 for detachably supporting each vibrator main body 15 has a U-shaped bracket 40 fixed to the lower surface of the swing arm 14, and screw portions 41a at both ends. 41a is inserted into a long hole 42 formed in the left and right side plates 40a of the bracket 40, a support shaft 41 bridged between the left and right side plates 40a, and a pulley 43 rotatably fitted to the support shaft 41, A presser nut screwed into the threaded portion 41a of the support shaft 41 and screwed into a screw hole 45 formed in the bottom plate 40b of the bracket 40 and a tightening nut 44 for tightening and fixing the support shaft 41 to the left and right side plates 40a of the bracket 40. The upper surface of the bolt 46 has a convex surface that matches the concave surface of the outer periphery of the pulley 43, and the lower end of the presser member 47 is connected to the tip of the presser bolt 46. The concave surface of the outer periphery of the pulley 43 is inverted. Jo of a concave and a receiving member 48 having a lower end. Note that the pressing member 47 and the receiving member 48 are formed of a vibration isolating material.

  In the hose fixing device 27 described above, when the tightening nut 44 is loosened, the support shaft 41 moves to the lower end side in the long hole 42, and as shown in FIG. 9A, the pulley 43, the receiving member 47, A large gap is formed between the two. The protective hose 22 connected to the vibrator main body 15 is extended through the gap between the pulley 43 formed in this way and the receiving member 48. In this state, the pulley 43 rotates freely. Therefore, the protective hose 22 can be pushed and pulled freely, and therefore the hanging height of the vibrator body 15 can be adjusted smoothly. On the other hand, when the presser bolt 46 is screwed from this state, as shown in FIG. 9B, the convex surface of the presser member 47 is fitted to the concave surface of the pulley 43, and the pulley 43 is moved according to the screwing of the presser bolt 46. The support shaft 41 moves up along the elongated hole 42. Finally, the protective hose 22 is sandwiched between the pulley 43 and the receiving member 48. In this state, if the fastening nut 44 is tightened and the support shaft 41 is fastened and fixed to the side plate 40a of the bracket 40, the protective hose is obtained. 22 is fixed in position, and the vibrator main body 15 comes to stably maintain a predetermined drooping height. The cable 29 connected to the sensor 28 attached to the vibrator body 15 is supported on the bottom plate 40 b of the bracket 40.

  Hereinafter, the vibration compaction method using the vibration compaction apparatus 10 configured as described above will be described with reference to FIGS. 10 and 11 as well.

  When the vibration compaction method is applied, the length of the support arm 14 and the swing angle thereof are set in advance in accordance with the positions of the placement port 2 and the insertion port 3 formed in the upper plate 1a of the steel shell structure 1. The bolts and nuts 33 constituting the expansion and contraction restricting means and the bolts and nuts 36 constituting the swing restricting means are respectively tightened to fix the support arm 14 so that the support arm 14 cannot be expanded and contracted. 14 position is fixed. In this construction, the concrete placement hose 4 is connected to the placement pipe 11 and then the vibration compaction device is connected to the arm of a concrete placement machine such as a distributor or a pump car via the concrete placement hose 4. 10 is supported. Then, the whole of the vibration compacting device 10 is lowered by the movement of the operation portion of the concrete placement machine, and the placement pipe 11 and the vibrator body 15 are moved from the corresponding placement port 2 and insertion port 3 to the steel shell. It is inserted into the closed space A in the structure 1.

  In the present embodiment (first embodiment), first, the vibration compaction device 10 is moved until the tip of the vibrator main body 15 reaches a position close to the bottom plate 1b of the steel shell structure 1 as shown in FIG. In this state, the placement of concrete (here, the above-described medium-fluid concrete) C is started through the placing pipe 11. As a result, the concrete C flows from the vicinity of the center of the closed space A in which the placement pipe 11 is located to the periphery, and gradually rises in the state where the vicinity of the placement pipe 11 is set to a medium height. Finally, the vibrator C Concrete C reaches the position of the upper sensor 28b provided near the middle of the main body 15. Then, in response to the signal from the sensor 28b, the signal processing device 30 calculates the filling height, and the result is sent to the operator of the concrete placing machine and the vibrator control device 26, thereby the vibrator control device. The activation of the vibrator main body 15 by 26 is started (vibration is started). Then, the vibrator main body 15 vibrates for a predetermined time. As a result, the concrete C is gradually compacted, and the placement of the first-layer concrete C1 (FIG. 10) is completed.

  When the placement of the first-layer concrete C1 is completed, the vibration compaction device 10 is raised by the movement of the operation portion of the concrete placement machine, and is attached to the vibrator body 15 as shown in FIG. The lower sensor 28a is lifted and stopped at a position where it becomes the top edge of the first-layer concrete C1. During this time, the injection of the concrete C from the placing pipe 11 is continued, and the top end of the first-layer concrete C1 is slightly raised. After that, as shown in FIG. 11, the concrete C starts to be driven again through the placement pipe 11, and when the concrete C reaches the position of the upper sensor 28 b, the vibration by the vibrator main body 15 starts according to the above-described procedure. Is done. As a result, the newly placed concrete C is gradually compacted, and the placement of the second layer of concrete is completed. Thereafter, the above operation is repeated while raising the vibration compaction device 10 by a predetermined distance. Thus, the filling of the concrete into the closed space A is completed.

  Here, in the first embodiment, the sensors 28 (28a, 28b) are disposed at two locations, that is, the front end side of the vibrator main body 15 and the vicinity of the middle. Sensors 28 may be arranged at two locations on the side. FIG. 12 and FIG. 13 show an embodiment (second embodiment) of the vibration compaction method in this case. Here, for convenience, the lower sensor and the upper sensor are connected to the first embodiment and FIG. The same reference numerals 28a and 28b are assigned.

  The basic construction procedure of the second embodiment is the same as that of the first embodiment described above. First, as shown in FIG. 1, the tip of the vibrator main body 15 approaches the bottom plate 1 b of the steel shell structure 1. The vibration compaction device 10 is lowered until the position is reached, and in this state, the concrete C starts to be driven into the closed space A through the placement tube 11. Then, when it is confirmed that the concrete C has reached the position of the sensor 28a on the lower side of the vibrator main body 15, the vibration by the vibrator main body 15 is started, whereby the first concrete C1 (FIG. 12) is placed. finish.

  When the placement of the first-layer concrete C1 is completed, as shown in FIG. 12, the vibration compaction device 10 is fixed in position, and the concrete layer is lifted by the upper sensor 28b. When the position is reached, vibration by the vibrator 15 is started, and thereby the placement of the second-layer concrete C2 (FIG. 13) is completed. Thereafter, the vibration compaction device 10 is moved up to a position where the lower sensor 28a becomes the top end of the second-layer concrete C2, as shown in FIG. 13, due to the movement of the operation unit of the concrete placing machine. Then, when the concrete C reaches the position of the upper sensor 28b, vibration by the vibrator main body 15 is started, and thereby the placement of the third layer of concrete is finished. Thereafter, the above operation is repeated while raising the vibration compaction device 10 by a predetermined distance, whereby the concrete filling into the closed space A is completed.

  In each of the above embodiments, the sensor 28 (28a, 28b) for detecting the filling height of the concrete in the closed space A is attached to the vibrator main body 15. Therefore, it is necessary to separately provide the sensor in the closed space. In addition, the number of sensors used can be minimized, which is advantageous in terms of workability and cost.

  In addition, the closed space A targeted by the present invention means that it is closed to the extent that it cannot be operated while visually inspecting from the outside (open and cannot be operated), and even if a part thereof is opened, It is included in the enclosed space as referred to in the present invention. Of course, this closed space may be a closed space formed in a structure other than the above-described submerged steel shell structure 1. In each of the above embodiments, four support arms 14 for supporting the vibrator body 15 are provided. However, the number of the support arms 14 is arbitrary, and the number of support arms 14 may be two or three or more. May be. Furthermore, in each said embodiment, although the medium fluidity concrete was used as the concrete C struck into the closed space A, the kind of this concrete is also arbitrary and may be high fluidity concrete or ordinary concrete. .

It is a side view which shows the whole structure and usage condition of the vibration compaction apparatus in the closed space as one embodiment of this invention. It is a side view which expands and shows substantially half of this vibration compaction apparatus. It is a top view which shows the whole structure of this vibration compaction apparatus. It is a schematic diagram which shows the movable range of the support arm in this vibration compaction apparatus. It is a side view which shows the connection structure with respect to the installation pipe | tube of a support arm in this vibration compaction apparatus. It is a top view which shows the connection structure with respect to the placement pipe of the support arm shown in FIG. It is sectional drawing which shows the connection structure with respect to the installation pipe | tube of the support arm shown in FIG. It is a front view which shows the structure of the hose fixing device which supports the hose of the vibrator in this vibration compaction apparatus. It is a side view which shows the structure of the hose fixing device which supports the hose of the vibrator in this vibration compaction apparatus. It is a side view which shows 1st Embodiment of the vibration compaction construction method performed using this vibration compaction apparatus. It is a side view which shows the state in the middle of construction in 1st Embodiment. It is a side view which shows 2nd Embodiment of the vibration compaction method performed using this vibration compaction apparatus. It is a side view which shows the state in the middle of construction in 2nd Embodiment.

Explanation of symbols

1 Steel shell structure (structure)
2 Placing port 3 Inserting port 4 Concrete placing hose A Closed space 10 Vibration compaction device 11 Concrete placing pipe 14 Support arm 15 Vibrator body 19 Support arm fixed frame 20 Support arm movable frame 22 Vibrator body protection cable 27 Hose Fixing device 28 (28a, 28b) Sensor 29 Sensor cable 33 Bolt nut (expansion and contraction restricting means)
36 Bolts and nuts (rocking restricting means)

Claims (5)

  A concrete placement pipe whose upper end is connected to the concrete placement hose and whose lower end is inserted into the closed space of the structure, and a base end which can swing around its axis on the upper end side of the concrete placement pipe A plurality of extendable support arms on which a shaft is attached, a vibrator body that is suspended from the tip of the support arm and is inserted into a closed space through an insertion port formed in advance in the structure, and the support arm A vibration compaction device for concrete in a closed space, characterized by comprising expansion / contraction restriction means for restricting expansion / contraction of the support and rocking restriction means for restricting rocking of the support arm.   2. The vibration of concrete in a closed space according to claim 1, wherein the plurality of support arms are arranged radially about a rocking fulcrum set equally in the circumferential direction of the concrete placing pipe. Compaction device.   The vibration compaction device for concrete in a closed space according to claim 2, wherein four support arms are provided, and each support arm can swing within a range of approximately 90 degrees.   In the vibration compaction method of concrete in a closed space performed using the vibration compaction device according to any one of claims 1 to 3, a signal from a sensor that detects a filling height of concrete in the closed space is used. A vibration compaction method for concrete in a closed space, characterized by controlling the insertion height of the vibration compaction device into the closed space and controlling the operation of the vibrator body.   The vibration compaction method for concrete in a closed space according to claim 4, wherein a sensor for detecting a filling height of the concrete is attached to each vibrator body.

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