JP2018126928A - Wash-out method for precast concrete product and wash-out system for precast concrete product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wash-out method for a precast concrete product and a wash-out system for the precast concrete product, in a wash-out operation for the precast concrete product, capable of reducing a load on an operator and capable of improving productivity.SOLUTION: Provided is a wash-out method comprising a wash-out step where a construction joint surface 8a of a precast concrete product 8 is washed out with high pressure water jetted from a wash-out device 10 to exposure an aggregate. In the wash-out step, the wash-out device 10 is automatically moved while retaining prescribed intervals to the construction joint surface 8a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a precast concrete product washing method and a precast concrete product washing system.

  Precast concrete products are used as floor slabs and main girders in bridges and the like. A plurality of precast concrete floor slabs are provided side by side on the main girder, and cast-in-place concrete is placed at these intervals to be integrated with other adjacent precast concrete floor slabs.

  In the precast concrete floor slab, the casting surface in contact with the cast-in-place concrete is roughened in order to maintain predetermined adhesion strength with the cast-in-place concrete. Usually, the roughening finish is performed by washing out water at a high pressure with a high washer or the like.

  In the conventional washing method, water is jetted by gripping the grip of the high washer with the hand of the worker, so that the worker will always receive the reaction force from the high washer until washing of the joint surface is completed. This puts a heavy burden on the workers. In addition, since the conventional washing method is performed by human power, there is a problem in that washing is not uniformly performed on the joint surface. Furthermore, precast concrete floor slabs used for bridges, etc. have a longer joint surface extension than concrete blocks, and the reinforcing bars for embedding in cast-in-place concrete protrude from the joint surface. Since the washing work is extremely difficult to perform, it takes a long time to complete the washing work, and the productivity is hindered.

  Conventionally, the technique disclosed by patent document 1 or 2 is proposed regarding the roughening finishing of the concrete surface.

  The method for producing a concrete block disclosed in Patent Document 1 is a block body in which at least a surface layer is a block body formed by pressing and compacting a concrete material in which aggregate is mixed with cement, and the surface layer is in an uncured state. Pressurize and spray a liquid mixture of liquid and gas on the surface of the surface to wash away the cement that has buried the aggregate from the surface layer and expose a portion of the aggregate on the surface to make the surface uneven. Form on the makeup face. Thereby, it is supposed that the manufacturing method of the concrete block disclosed by patent document 1 can suppress the fall of the production efficiency at the time of manufacturing the concrete block which has an uneven | corrugated decorative surface on the surface by a washing-out construction method.

  However, the method for producing a concrete block disclosed in Patent Document 1 is only applied to a concrete block used for a pavement board, and is not applied to a precast concrete product used for a bridge or the like. It is not performed in order to maintain adhesion with the concrete cast on the washing surface. In addition, the method for producing a concrete block disclosed in Patent Document 1 has a problem in that it takes time to wash out because a mixed fluid of liquid and gas is injected under pressure.

  The surface finishing method disclosed in Patent Document 2 is a surface finishing method in which cement is used as a main binder and a gap is provided between the aggregates to maintain water permeability, and the aggregate weight loss is 40% or less. The one having a compressive strength of 200 kgf / cm @ 2 or more manufactured using the above aggregate is used. A high pressure water stream is sprayed on the surface of the concrete block substantially uniformly to the surface of the concrete block to such an extent that the binder on the surface cannot be visually observed or a part of the aggregate is crushed by using a high pressure water jet device. Expose aggregate. According to the surface finishing method disclosed in Patent Document 2, even when the compressive strength of concrete is high, the cosmetic aggregate is efficiently exposed by washing out with high-pressure water, and thereby the surface of the water-permeable block can be colored. ing.

  However, the surface finishing method disclosed in Patent Document 2 is such that the block itself is transported by a transport means, and cannot be applied to a precast concrete product having a long span used for a bridge or the like. In addition, the surface finishing method disclosed in Patent Document 2 is used only for colorizing blocks, and in order to spray high-pressure water to such an extent that a part of the aggregate is crushed, There was a risk of taking time.

JP2015-226984A JP 2001-269920 A

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to reduce the burden on workers in washing out precast concrete products, and to improve productivity. It is an object of the present invention to provide a precast concrete product washing method and a precast concrete product washing system that can be improved.

  The precast concrete product washing method according to the first invention includes a washing step of washing the joint surface of the precast concrete product with high-pressure water sprayed from a washing device, and exposing the aggregate, wherein the washing step Then, the washing device is automatically moved while maintaining a predetermined interval with respect to the joining surface.

  In the washing method of the precast concrete product according to the second invention, in the first invention, in the washing step, the washing device is in a state where a supply device for supplying water to the washing device is fixed at a predetermined place. Is automatically moved.

  The precast concrete product washing method according to the third invention is the first invention or the second invention, wherein in the washing step, the plurality of nozzles in the washing device are arranged at different angles, and the plurality of nozzles are arranged. The water is washed out by jetting water at a high pressure.

  The precast concrete product washing method according to a fourth aspect of the present invention is the method according to any one of the first to third aspects, wherein in the washing step, the washing device that moves in a predetermined section is connected to the end side of the section. It is made to move away from the said stopper by making it contact with the stopper provided in this.

  The precast concrete product washing method according to a fifth aspect of the present invention is the method according to any one of the first to fourth aspects, wherein in the washing step, the washing is performed by a carriage that moves a rail provided along the joint surface. The exit device is moved.

  A washing system for a precast concrete product according to a sixth aspect of the present invention includes a washing device for washing the precast concrete product by spraying water at a high pressure, and the washing device has a predetermined interval with respect to the joint surface of the precast concrete product. It moves automatically while keeping

  According to the 1st invention-the 6th invention, it becomes possible to reduce a worker's burden in washing-out work of a precast concrete product, and it becomes possible to improve productivity.

It is a figure which shows the precast concrete product washed out by the washing | cleaning system of the precast concrete product to which this invention is applied. It is a top view which shows the washing | cleaning system of the precast concrete product to which this invention is applied. It is a side view which expands and shows the washing apparatus in the washing system of the precast concrete product to which this invention is applied. It is a figure which shows the modification of the fixing | fixed part in the washing | cleaning system of the precast concrete product to which this invention is applied. It is a front view which expands and shows the state which the washing | cleaning apparatus in the washing | cleaning system of the precast concrete product to which this invention is applied located in the edge part of a rail. It is a figure which shows the state which wash | cleans a T girder as a precast concrete product using the washing system of the precast concrete product to which this invention is applied. It is a figure which shows the state which wash | cleans a hollow girder as a precast concrete product using the washing | cleaning system of the precast concrete product to which this invention is applied. It is a top view which shows the modification 1 in the washing | cleaning system of the precast concrete product to which this invention is applied. It is a side view which shows the modification 2 in the washing | cleaning system of the precast concrete product to which this invention is applied. It is a side view which shows the modification 3 in the washing | cleaning system of the precast concrete product to which this invention is applied.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a precast concrete product system and a precast concrete product washing method to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a bridge 7 in which a precast concrete product 8 washed out by a precast concrete product washing system 1 to which the present invention is applied is used.

  The precast concrete product 8 is a precast concrete floor slab manufactured at a factory and used as a floor slab of the bridge 7, for example. A plurality of precast concrete products 8 are provided toward the bridge axis direction of the bridge 7 and are placed on the main girder 71. Two adjacent precast concrete products 8 are provided at intervals, and cast-in-place concrete 9 is placed at these intervals to join each other. In the precast concrete product 8, a reinforcing bar 81 is protruded from a joint surface 8 a to which the cast-in-place concrete 9 is contacted, and the protruded reinforcing bar 81 is embedded in the cast-in-place concrete 9.

  In order to join the precast concrete product 8 to the cast-in-place concrete 9 with a predetermined adhesion strength, high-pressure water is jetted onto the joint surface 8a and washed out to such an extent that the aggregate is exposed. The precast concrete product 8 is manufactured by placing concrete on a formwork preliminarily coated with a retarder, etc., in order to perform washing out more easily, and has a surface facing the formwork coated with the retarder etc. The joint surface 8a is used.

  Although the precast concrete product 8 is formed in a substantially rectangular parallelepiped shape and illustrates a form in which the joining surface 8a is formed on the side surface, the joining surface 8a may be formed on the upper surface or the lower surface. Moreover, although the precast concrete product 8 has illustrated the form in which the inclination part 8b inclined in the height direction is formed in the joint surface 8a, it is formed substantially perpendicularly without being inclined in the height direction. It may be a thing.

  FIG. 2 is a plan view showing a precast concrete product washing system 1 to which the present invention is applied. FIG. 3 is an enlarged side view showing the washing apparatus 10 in the washing system 1 for precast concrete products to which the present invention is applied.

  The precast concrete product washing system 1 to which the present invention is applied is used to wash out the joint surface 8 a of the precast concrete product 8.

  The precast concrete product washing system 1 includes a washing device 10 for washing water by jetting water onto the joint surface 8 a of the precast concrete product 8 at a high pressure, and a supply device 20 for supplying water to the washing device 10.

  The washing device 10 includes a nozzle 11 that ejects water at a high pressure, a fixing portion 12 that fixes the nozzle 11 at a predetermined position, and a carriage 13 on which the fixing portion 12 is provided.

  The nozzle 11 is formed so as to extend in a rod shape, and jets water linearly from the tip portion 11a, and the tip portion 11a rotates at high speed in the circumferential direction of the shaft, thereby jetting water radially. . The nozzle 11 has a base end portion 11b opposite to the tip end portion 11a connected to the supply device 20 via a hose 11c, and has a valve 11d for adjusting the amount of water supplied from the supply device 20 on the base end portion 11b side. . The hose 11 c has a length sufficient to follow the movement of the nozzle 11 because the nozzle 11 moves in a predetermined section.

  Two nozzles 11 are provided in the fixed portion 12 and are arranged at different angles. The nozzle 11 is preferably arranged perpendicular to the joint surface 8 a of the precast concrete product 8. Two or more nozzles 11 may be provided on the fixing portion 12 or may be provided by one.

  The fixing portion 12 is made of two L-shaped angle steels, and the two L-shaped angle steels are erected on the carriage 13 while being separated from each other. The fixed portion 12 is arranged such that the flanges 12a and 12b of the two L-shaped angle steels are perpendicular to the joining surface 8a, and is formed by extending the flanges 12a and 12b in the height direction. Holes 121 and 122 are formed in two places, respectively.

  In the fixing portion 12, two long holes 121 in the flange 12a are respectively arranged on the center side in the height direction of the L-shaped angle steel, and two long holes 122 in the flange 12b are respectively ends in the height direction of the L-shaped angle steel. It is arranged on the part side. In the fixing portion 12, the arrangement height of the upper elongated hole 121 in the flange 12a is equal to or less than the arrangement height of the upper elongated hole 122 in the flange 12b, and the arrangement height of the lower elongated hole 121 in the flange 12a is the flange 12b. The height of the lower long hole 122 in FIG.

  In the fixing portion 12, the nozzle 11 is fixed to a predetermined height by fastening portions 123 such as bolts and screws provided in the long holes 121 and 122. In the fixing portion 12, the upper nozzle 11 is inclined and fixed downward, and the lower nozzle 11 is inclined and fixed upward.

  The fixed portion 12 is fixed to the elongated holes 121 and 122 through the fastening portion 123 at a predetermined height, and the position of the fastening portion 123 is adjusted to adjust the position of the nozzle 11 relative to the joining surface 8a. It is possible to change the angle. The fixing portion 12 is not fixed so that the two nozzles 11 are at different angles, but may be fixed so that the two nozzles 11 are at the same angle, and are fixed so that they are horizontal to each other. It may be a thing.

  The fixed portion 12 is connected to two L-shaped angle steels erected on the carriage via a connecting portion 129 using a steel material such as L-shaped angle steel.

  FIG. 4 is a view showing a modified example of the fixing portion 12 in the precast concrete product washing system 1 to which the present invention is applied. As shown in FIG. 4, one steel material or the like extending in the height direction may be used for the fixing portion 12 without using two L-shaped angle steels. The fixing part 12 fixes the nozzle 11 to a predetermined height by the fastening part 123. At this time, the fixing portion 12 is attached so that the nozzle 11 can rotate around the fastening portion 123. Thereby, the fixing | fixed part 12 can change the angle of the nozzle 11 with respect to the joining surface 8a.

  As shown in FIG. 2, the carriage 13 runs on a rail 31 that extends along the joint surface 8 a of the precast concrete product 8.

  FIG. 5 is an enlarged front view showing a state in which the washing device 10 in the washing system 1 for precast concrete products to which the present invention is applied is positioned at the end 31 a of the rail 31.

  The carriage 13 has four wheels, and has a motor that drives these wheels and a battery that supplies electric power to the motor, so that the carriage 13 automatically moves on the rail 31. The rail 31 is made of, for example, two groove steels such as C-shaped steel, and is provided on the ground so that the open side faces upward, and has a dimension longer than the length of the joint surface 8 a of the precast concrete product 8. The rail 31 only needs to extend along the joining surface 8a. When the joining surface 8a is formed to extend linearly in a plan view, the rail 31 extends linearly along the joining surface 8a. However, when the joining surface 8a is curved in plan view, it may be formed so as to be curved along the joining surface 8a.

  The rail 31 is provided with stoppers 32 using concrete, wood, steel, etc. at both ends 31a. In addition, the rail 31 is not restricted to the form in which the stopper 32 is provided in both ends 31a, and the stopper 32 should just be provided in the outer side rather than the joint surface 8a in the moving direction of the washing | cleaning apparatus 10. FIG.

  In addition, although the rail 31 illustrated the form in which two C-shaped steel is used, one C-shaped steel may be used. Further, the rail 31 is not limited to C-shaped steel, and may be a steel material or the like extending in the vertical direction from the ground so as to sandwich the wheels in the carriage 13.

  The carriage 13 is provided with a control unit 41 that controls driving of the motor. The movement of the carriage 13 is controlled by the control unit 41, and the carriage 13 moves on the rail 31 at a constant speed. The control unit 41 is connected to two switch units 42 that project outward from both end portions in the moving direction of the carriage 13 via cables. For example, an elastic body such as a resin is used for the switch unit 42 and is supported by the support unit 4 for fixing the switch unit 42 at a predetermined position on the carriage 13.

  The control unit 41 automatically switches the carriage 13 after moving the carriage 13 so as to be separated from the stopper 32 by a predetermined distance by switching the moving direction of the carriage 13 when the switch unit 42 contacts the stopper 32. The movement is controlled to stop. Moreover, the control part 41 is controlled so that the water sprayed from the nozzle 11 also stops, when the movement of the trolley | bogie 13 stops. In addition, the predetermined distance here means a distance smaller than the distance from the stopper 32 to the precast concrete product 8.

  Note that the control unit 41 continues to move at a constant speed without stopping the movement of the carriage 13 even after the carriage 13 moves so as to be separated from the stopper 32 with which the switch section 42 contacts by a predetermined distance. It may be one that controls. At this time, the control unit 41 controls the carriage 13 so as to reciprocate on the rail 31.

  In addition, the control part 41 may control to stop the movement of the carriage 13 when the switch part 42 is brought into contact with the stopper 32.

  The supply device 20 includes a high pressure machine 21 that sends water to the nozzle 11 of the washing device 10 at a high pressure, and a water storage tank 22 that stores water to be supplied to the high pressure machine 21. The supply device 20 has a high-pressure machine 21 and a water storage tank 22 fixed to the ground.

  Next, the washing method of the precast concrete product to which this invention is applied is demonstrated.

  The washing method of the precast concrete product to which the present invention is applied includes a washing step of washing the joint surface 8a of the precast concrete product 8 with high-pressure water sprayed from the washing device 10 to expose the aggregate.

  In the washing process, first, in the factory where the precast concrete product 8 is manufactured, a plurality of (2 in the drawing) are arranged so that the precast concrete product 8 is arranged on the gantry 89 along the linearly extending rail 31. I) Line up.

  In the washing process, the two nozzles 11 are fixed to the long holes 121 and 122 in the flanges 12a and 12b via the fastening portions 123 so as to be arranged vertically. In the washing step, the upper nozzle 11 is tilted and fixed downward, and the lower nozzle is tilted and fixed upward. At this time, in the washing step, it is desirable to fix the upper nozzle 11 so as to be substantially perpendicular to the inclined portion 8b.

  In the washing step, the water stored in the water storage tank 22 is supplied via the high pressure machine 21 to the nozzle 11 of the washing device 10 installed on the one end 31 a side of the rail 31. At this time, in the washing step, the amount of water ejected from the nozzle 11 is adjusted by adjusting the valve 11 d of the nozzle 11.

  In the washing process, the washing device 10 installed on the one end 31 a side of the rail 31 is automatically moved toward the other end 31 a side of the rail 31. In the washing process, water 13 is sprayed from the nozzle 11 at a high pressure while maintaining a predetermined distance with respect to the joining surface 8a of the precast concrete product 8, and the carriage 13 moves along the rail 31 provided along the joining surface 8a. To automatically move the washing device 10. At this time, in the washing process, the control unit 41 controls the carriage 13 to move at a constant speed. In the washing process, the supply device 20 that supplies water to the washing device 10 is fixed in a predetermined place.

  In the washing step, water is jetted at a high pressure from two nozzles 11 arranged at different angles to wash out the joint surface 8a to expose the aggregate. At this time, in the washing step, the tip 11a of the nozzle 11 rotates at high speed, so that water is ejected radially from the nozzle 11 to wash out the joining surface 8a and wash away the cement content of the joining surface 8a. Then, the aggregate is exposed.

  In the washing process, the washing device 10 is moved from the one end 31a side of the rail 31 to the other end 31a, and the switch portion 42 is brought into contact with the stopper 32 provided on the other end 31a side of the rail 31. . In the washing step, by bringing the switch portion 42 into contact with the stopper 32, the washing device 10 is moved by a predetermined distance in a direction away from the stopper 32 (toward the one end portion 31a), and thereafter Stop moving. In the washing step, when the movement of the washing device 10 is stopped, the water sprayed from the nozzle 11 is also stopped, and washing of the precast concrete product 8 is completed.

  In the precast concrete product washing method to which the present invention is applied, water is sprayed from the nozzle 11 at a high pressure while maintaining a predetermined distance from the joint surface 8a of the precast concrete product 8, along the joint surface 8a. The washing device 10 is automatically moved by the carriage 13 that moves the provided rail 31. Thereby, according to the washing | cleaning method of the precast concrete product to which this invention is applied, it becomes possible to wash out the precast concrete product 8 without a worker's hand, and, as a result, reduces the burden on a worker. It is also possible to prevent occupational accidents caused by workers.

  In the washing method of the precast concrete product to which the present invention is applied, it is possible to uniformly wash out the joining surface 8a by spraying water from the nozzle 11 at a high pressure while maintaining a predetermined interval. It becomes possible to improve.

  In the washing method of the precast concrete product to which the present invention is applied, the washing device 10 is automatically moved in a state where the supply device 20 for supplying water to the washing device 10 is fixed at a predetermined place. For this reason, according to the washing | cleaning method of a precast concrete product, the weight of the washing | cleaning apparatus 10 which moves on the rail 31 by fixing the high-pressure machine 21 which has a predetermined weight, and the water storage tank 22 to a predetermined place. Can be made lighter, and the cart can be driven by a smaller motor. Thus, according to the washing method of the precast concrete product to which the present invention is applied, since the carriage 13 is driven by a smaller motor, a large motor is not required, so that washing can be performed at a lower cost. Become.

  In the washing method of the precast concrete product to which the present invention is applied, the washing device 10 is moved by the carriage 13 that moves on the rail 31 in which the C-shaped steel is used. At this time, in the washing method of the precast concrete product to which the present invention is applied, since the open side of the C-shaped steel is provided so as to face upward, the wheel of the carriage 13 moves while being sandwiched between the flanges of the C-shaped steel. Therefore, it is possible to inject water from the nozzle 11 at a high pressure while maintaining a predetermined distance from the joining surface 8a without causing the carriage 13 to run away.

  In the precast concrete product washing method to which the present invention is applied, the plurality of nozzles 11 in the washing apparatus 10 are arranged at different angles, and water is injected from the plurality of nozzles 11 at a high pressure to wash out the joining surface 8a. . For this reason, according to the washing method of the precast concrete product to which the present invention is applied, the upper nozzle 11 disposed to be inclined downward is disposed substantially perpendicular to the inclined portion 8b of the joining surface 8a. Accordingly, it is possible to efficiently wash out the joining surface 8a.

  Further, in the washing method of the precast concrete product to which the present invention is applied, the upper side of the rebar 81 protruding in a substantially horizontal direction by jetting water at a high pressure from two nozzles 11 arranged at different angles, and Water is jetted from both sides of the lower side, so that it is possible to surely wash out the surroundings of the reinforcing bar 81 without washing away the cement around the reinforcing bar 81.

  In the washing method of the precast concrete product to which the present invention described above is applied, the washing device 10 is moved only one way, and the washing is performed as an example. However, the washing device 10 moves back and forth. It may be washed out. For example, although the precast concrete product 8 is washed out by jetting water from the washing device 10 at a high pressure, when the inexpensive high pressure machine 21 supplies the nozzle 11, the washing is carried out with the water pressure being low. There is a possibility that the cement content may remain on the joint surface 8a without completely washing out the cement content on the joint surface 8a. When cast-in-place concrete 9 is cast with cement remaining on the joint surface 8a, sufficient adhesion strength between the precast concrete product 8 and cast-in-place concrete 9 cannot be ensured.

  In such a case, in the washing method of the precast concrete product to which the present invention is applied, the joining surface 8a is washed out in the outward path, and the cement remaining on the joining surface 8a is washed away in the returning path, so that the joining surface is washed out. 8a will be washed out. Thus, in the washing method of the precast concrete product to which the present invention is applied, even if the water pressure sprayed from the washing device 10 is small, the washing device 10 is reciprocated on the rail, thereby It becomes possible to wash out the joint surface 8a. That is, in the washing method of the precast concrete product to which the present invention is applied, it is possible to wash out the joint surface 8a even with an inexpensive high-pressure machine 21 with a low water pressure to be jetted. Since an expensive high-pressure machine 21 having a large water pressure is not required, washing out can be performed at a lower cost.

  FIG. 6 is a diagram showing a state in which a T-girder is washed out as a precast concrete product 8 by using the precast concrete product washing system 1 to which the present invention is applied.

  The precast concrete product washing system 1 to which the present invention is applied has been described by taking a precast concrete floor slab as an example of the precast concrete product 8, but as shown in FIG. It may be a digit. At this time, the precast concrete product washing system 1 injects water at a high pressure onto the joining surface 8 a formed on the side surface of the T-girder as the precast concrete product 8. The precast concrete product washing system 1 is arranged such that the two nozzles 11 are at different angles. At this time, the washing system 1 for precast concrete products joins the upper part of the T-girder extending in the substantially horizontal direction and the lower part extending in the substantially vertical direction by inclining the nozzle 11 disposed on the lower side upward. It is possible to efficiently wash out the vicinity of the part.

  FIG. 7 is a view showing a state where a hollow girder is washed out as a precast concrete product 8 by using the precast concrete product washing system 1 to which the present invention is applied.

  In addition, the washing system 1 of the precast concrete product to which this invention is applied may be a hollow girder formed as a precast concrete product 8 in a hollow shape having a square cross section as shown in FIG. At this time, the precast concrete product washing system 1 injects water at a high pressure onto the joining surface 8 a formed on the side surface of the hollow girder as the precast concrete product 8. In the precast concrete product washing system 1, the nozzle 11 is arranged so as to be substantially perpendicular to the inclined portion 8b even if the inclined portion 8b is formed on the joining surface 8a of the hollow girder. It becomes possible to wash out the inclined portion 8b efficiently.

  FIG. 8: is a top view which shows the modification 1 in the washing system 1 of the precast concrete product to which this invention is applied.

  As shown in FIG. 8, the precast concrete product washing system 1 to which the present invention is applied may have a plurality of sensed objects 131 provided along the joint surface 8 a of the precast concrete product 8. At this time, in the precast concrete product washing system 1 to which the present invention is applied, a sensor 43 for detecting the sensed object 131 by infrared rays or the like is provided on the carriage 13, and the sensor 43 is provided on the joining surface 8 a of the precast concrete product 8. By sensing the sensing object 131 provided along, the carriage 13 moves in a state of being maintained at a predetermined interval along the joint surface 8a of the precast concrete product 8 without running away. Thereby, the washing | cleaning system 1 of the precast concrete product to which this invention is applied can wash out the joint surface 8a uniformly, when water is injected at a high pressure. The sensor 43 may be embodied by being connected to the control unit 41, or may be embodied by being incorporated in the control unit 41.

  FIG. 9 is a diagram showing a second modification of the washing system 1 for precast concrete products to which the present invention is applied.

  In the precast concrete product washing system 1 to which the present invention is applied, as shown in FIG. 9, a fixing portion 12 for fixing the nozzle 11 is provided in a lifting device 19 that moves up and down in the height direction. For example, the lifting device 19 may raise or lower the height of the fixing portion 12 by injecting or discharging air, or may raise or lower the height of the fixing portion 12 by hydraulic pressure. Good.

  In the precast concrete product washing system 1 to which the present invention is applied, the lifting device 19 is provided, whereby the height of the washing device 10 that reciprocates in a predetermined section can be made different between the forward path and the backward path. For this reason, in the precast concrete product washing system 1 to which the present invention is applied, for example, when the precast concrete product 8 is stacked in a plurality of stages (two stages in the figure) in the height direction, the precast concrete product provided in the upper stage in the forward path It is possible to wash out the precast concrete product 8 provided in the lower stage on the return path. As described above, the precast concrete product washing system 1 to which the present invention is applied can wash out different precast concrete products 8 in the forward path and the return path. In addition, since the precast concrete product washing system 1 to which the present invention is applied can wash out the precast concrete product 8 stacked in a plurality of stages, the limited space of a factory or the like is effectively utilized. However, the washing out can be performed efficiently.

  FIG. 10 is a diagram showing a third modification of the washing system 1 for precast concrete products to which the present invention is applied.

  In the precast concrete product washing system 1 to which the present invention is applied, rails 31 are provided on the upper surface of the precast concrete product 8, as shown in FIG. At this time, in the precast concrete product washing system 1 to which the present invention is applied, the overhanging member 128 that projects outward from the joint surface 8 a on both sides of the precast concrete product 8 is provided on the carriage 13 that moves on the rail 31. Provided. For example, the projecting member 128 is made of steel or the like, and the fixing portions 12 that fix the plurality of nozzles 11 are provided on both end sides. For this reason, the precast concrete product washing system 1 to which the present invention is applied can wash out the joint surfaces 8a on both sides of the precast concrete product 8 at the same time. As a result, the productivity can be greatly improved. It becomes.

  In addition, although the washing | cleaning system 1 of the precast concrete product to which this invention was applied illustrated the form in which the supply apparatus 20 was fixed to the ground in the form mentioned above, the supply apparatus 20 and the wash-out apparatus 10 and the joint surface 8a. It may move along. At this time, in the precast concrete product washing system 1 to which the present invention is applied, the length of the hose 11 c that supplies water from the feeding device 20 to the washing device 10 is increased to follow the movement of the washing device 10. There is no need, and the length can be shortened. As a result, it is possible to completely eliminate the possibility that the washing device 10 moving along the joining surface 8a is caught by the hose 11c, and can be moved smoothly.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

  Next, examples of the precast concrete washing method to which the present invention is applied will be described.

  In the present invention example, there are two nozzles, the water pressure ejected from each nozzle is 8 (MPa), the amount of water to be ejected is 6 (liters / minute), and the precast moves at 0.1 (m / second). Washing out was performed using the concrete product washing system 1. In the comparative example, the water pressure to be ejected was 11 (MPa), and the worker washed out alone by a high washer with the amount of water to be ejected being 23 (liters / minute).

  Table 1 shows the results of washing out precast concrete slabs having a joining surface having a length of 10 m and a height of 0.5 m in the present invention example and the comparative example.

  In the example of the present invention, the completion time of washing out was 1 minute and 40 seconds, whereas in the comparative example, it was 15 minutes, and the example of the present invention was washed out in about 10% of the time compared to the comparative example. It was confirmed that it was possible. From this, it was confirmed that in the example of the present invention, it was possible to reduce the burden on the worker in the washing operation of the precast concrete slab, and to improve the productivity.

1: Washing system 7: Bridge 8: Precast concrete product 8a: Joint surface 8b: Inclined portion 9: Cast-in-place concrete 10: Washing device 11: Nozzle 11a: Tip portion 11b: Base end portion 11c: Hose 11d: Valve 12: Fixed part 13: Carriage 19: Lifting device 20: Supply device 21: High pressure machine 22: Water storage tank 31: Rail 31a: End 32: Stopper 41: Control unit 42: Switch unit 43: Sensor 71: Main girder 81: Reinforcing bar 89: Stand 121: Long hole 122: Long hole 123: Fastening part 128: Overhang member 129: Connection part 131: Object to be sensed

Claims (6)

Washing out the joint surface of the precast concrete product with high-pressure water sprayed from the washing device, and having a washing process to expose the aggregate,
In the washing step, the washing device is automatically moved while maintaining a predetermined interval with respect to the joint surface. 2. The precast concrete product according to claim 1, wherein in the washing step, the washing device is automatically moved in a state where a supply device for supplying water to the washing device is fixed at a predetermined place. How to wash out 3. The precast concrete according to claim 1, wherein in the washing step, the plurality of nozzles in the washing device are arranged at different angles, and water is sprayed from the plurality of nozzles at a high pressure. How to wash out products. In the washing step, the washing device that moves in a predetermined section is moved away from the stopper by contacting a stopper provided on the end side of the section. The washing | cleaning method of the precast concrete product in any one of Claims 1-3. The precast concrete product according to any one of claims 1 to 4, wherein, in the washing step, the washing device is moved by a carriage that moves a rail provided along the joint surface. How to wash out Equipped with a washing device that sprays water on the precast concrete product at high pressure,
A washing system for a precast concrete product, wherein the washing device automatically moves with a predetermined distance from the joint surface of the precast concrete product.

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