JP2008308816A - Construction method for precast concrete slab and precast concrete slab and smoothing plate used in the construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for replacing a PCa slab in a runway and an apron in an airport and eliminating a step caused when constructing a new PCa slab adjacent to the existing or already replaced PCa slab temporarily by a simple configuration. <P>SOLUTION: In this construction method for precast concrete slab, when height of an end part of the adjacent and temporarily constructed precast concrete slab 20A is smaller than height of an end part of the existing or already replaced precast concrete slab 20 and the step H occurs, the smoothing plate 40 having one end part having thickness being equivalent to that of the step and the other end part having a tapered part 44 whose thickness is gradually reduced is formed, and the smoothing plate 40 is fixed on an upper face of the end part of the temporarily constructed precast concrete slab 20A to eliminate the step H. Furthermore, when constructing the temporarily constructed precast concrete slab 20A actually, the smoothing plate 40 is first removed and then this precast concrete slab is actually constructed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a precast concrete plate construction method and a precast concrete plate and a gluing plate used in the construction method, and in particular, replacement of a precast concrete plate laid on an airport runway, an apron, or an automobile road. The present invention relates to a construction method in work and a precast concrete plate and a sliding plate used in the construction method.

  2. Description of the Related Art Conventionally, on airport runways, aprons, or automobile roads, a construction method in which a precast concrete plate (hereinafter referred to as a PCa plate) is continuously laid on a constructed roadbed has been widely used. Since the PCa plate is produced in advance in a factory or the like, the manufacturing accuracy is high and the on-site work period can be shortened.

  There are various methods for connecting the PCa plates laid on the roadbed, but a method of connecting with a cotter type joint device is known. The cotter-type joint device is composed of a receiving metal fitting and an insertion fitting that can be attached to and detached from the opposite receiving metal fittings, and the receiving metal fitting has a C-shaped slot on the upper surface, and the groove A screw portion for screwing a bolt is provided at the bottom of the hole. The receiving metal fittings are embedded at predetermined intervals on the upper surface of the end portion of the PCa plate, and an opening recess is provided on the upper surface of the receiving metal fittings.

  Then, the receiving metal fittings provided at the respective end portions of the adjacent PCa plates are opposed to each other, and a cotter having a H sectional shape in plan view, which is an insertion fitting, is vertically inserted into a slot that is combined with the H shape in a plan view. Then, the PCa plates are connected to each other. Further, by inserting a bolt into the bolt hole opened in the cotter and screwing it into the screw portion at the bottom of the slot, the cotter is fixed to the slot of both receiving brackets, and adjacent PCa plates Are configured to be securely and firmly connected (see, for example, Patent Document 1 and Patent Document 2).

  Here, when renovating the runway or apron of the airport, work is done at night when there are no airplanes. For this reason, the entire runway and apron area cannot be repaired at once, the existing pavement in a limited area is removed little by little, a new PCa version is laid, and the plane arrives and departs the next morning. It must be restored to a ready state.

  However, even in a limited area, after removing the existing pavement, installing a new PCa plate, and completing all the construction work such as height adjustment and grout injection is limited at night. It is impossible in the given time. For this reason, once a new PCa plate is installed, it is temporarily constructed in a state where the airplane can be arrived and departed, and at the time of the next day's work, the PCa plate of the area temporarily constructed the previous day is actually constructed.

  FIG. 17 is a flowchart showing a procedure up to provisional construction among the repair work in the conventional airport pavement. PCa plates are connected by a cotter-type joint device, and the existing pavement in the area to be temporarily constructed on the day is removed from the work areas continuously laid (step 101). After the existing pavement is removed, in order to lay a new PCa plate on the exposed roadbed, first a roadbed filler is filled (step 102), and a vinyl sheet is laid thereon (step 103).

  Next, a new PCa plate is temporarily installed, but the PCa plate that has already been installed or has been replaced, such as where the PCa plate has not yet been replaced, or where the PCa plate has already been replaced and this construction has been completed. When a new PCa plate is temporarily installed adjacent to the PCa plate, the end height of the existing paved or replaced PCa plate is aligned with the height of the end of the temporarily installed PCa plate to define the level difference between the two PCa plates. Must be within value. If there is a level difference exceeding the specified value, there is a risk that the aircraft will be impacted at the level difference part or the PCa plate may be damaged, such as chipping, when the aircraft moves and travels due to airplane arrivals and departures. .

  For this reason, the installation height of the PCa plate on the temporary side is calculated, and before the PCa plate is temporarily installed so that the step between the two PCa plates is within the specified value, a polystyrene foam, a blue sheet, a flameproof sheet, etc. Are installed (step 104), and a new PCa plate is temporarily suspended on each of them by a crane (step 105).

  As described above, in order to temporarily install a new PCa plate with a step difference between adjacent PCa plates within a specified value and prevent lateral displacement of the temporarily installed PCa plate, a cotter is temporarily inserted into the cotter-type joint device of both PCa plates. Connection is made (step 106), and a lid is placed on the metal fitting of the cotter type joint device to cover the opening (step 107). Further, temporary marking such as a line is performed (step 108), and the temporary construction in the area is completed.

  FIG. 18 is a flowchart showing a procedure in the main construction among the repair work in the conventional airport pavement. In order to perform the PCa plate in the area temporarily provisioned the day before, it is necessary to remove the polystyrene foam, the blue sheet, the flameproof sheet, and the like that are installed to eliminate the level difference during the temporary construction. For this reason, first, the cover of the cotter joint device is removed and the opening is opened (step 111). After removing the cotter of the cotter joint device (step 112), one temporary PCa plate is placed. It is lifted with a crane and temporarily removed (step 113).

  Subsequently, the polystyrene foam, blue sheet, flameproof sheet and the like installed for height adjustment during temporary construction are removed (step 114). Then, the temporarily removed PCa plates are suspended and re-installed one by one with a crane (step 115), the height of the temporary PCa plate is adjusted using height adjusting bolts, etc. Is set within a specified value (step 116).

  Then, the grout material is poured into the lower part of the temporary PCa plate (step 117), and after curing for a predetermined time (step 118), the cotter is inserted into the cotter-type joint device of the adjacent PCa plate and the main connection is made. (Step 119), a cover is installed on the metal fitting of the cotter joint device to cover the opening (Step 120). Further, the equipment is cleaned up and cleaned (step 121), and the main construction in the area is completed. In addition, when carrying out the main construction in the area, the work days are shortened by carrying out temporary construction in another area at the same time.

  Thus, in the past, in order to eliminate the steps between adjacent PCa plates and the existing pavement, polystyrene foam, blue sheets, etc. were installed in advance under the temporary PCa plate. In order to remove the expanded polystyrene, etc., it was necessary to remove the PCa plate temporarily, resulting in a problem that the operation time of the crane was increased and the construction cost was increased. In addition, although this polystyrene foam can be reused originally, it is forbidden to be reused according to the rules of construction work, etc., and is therefore discarded for each temporary construction. Therefore, there are problems in terms of resource conservation and environmental protection.

In addition, as a method of eliminating the level difference between roads and concrete slabs during temporary construction, during the period from asphalt foundation pavement construction to asphalt finish pavement construction, a slope with a rubber mat is temporarily installed at the level difference between the asphalt foundation pavement surface and the side groove. When a box culvert is constructed, a retaining wall is created on the ground, the inner ground of the retaining wall is excavated to a predetermined depth, and a bracket is attached near the upper end of the retaining wall. By installing the upper slab of the box culvert on this bracket, the construction method (for example, patent) Reference 4) is known.
JP 2001-152403 A JP 2001-214694 A JP-A-9-13307 JP 2002-138561 A

  The inventions described in Patent Document 1 and Patent Document 2 enable rapid construction of concrete pavement in a wide range of places such as airport runways and aprons, and lay PCa plates together with a cotter-type joint device. A configuration for coupling is disclosed. Since the bolt is inserted into the cotter and screwed into the receiving metal fitting, the cotter can be prevented from loosening or coming out, and the PCa plate can be firmly connected. However, a construction method for refurbishing an existing runway or apron is not disclosed.

  In the invention described in Patent Document 3, a rubber mat is temporarily provided to eliminate the level difference, but it cannot withstand moving traveling of a heavy object such as an airport runway or an apron.

  The invention described in Patent Document 4 performs temporary lining so that no step is generated during temporary lining, but the purpose and application are completely different, such as excavating the ground below the temporarily installed upper slab.

  Therefore, when a new PCa plate is temporarily installed adjacent to an existing or replaced PCa plate in the construction method for replacing a PCa plate continuously laid on an airport runway, apron, or automobile road, etc. The technical problem to be solved in order to reduce the construction cost by shortening the operation time of the crane and reducing the operation time of the crane will occur. The present invention aims to solve this problem.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a construction method in which an existing pavement continuously laid on a constructed roadbed is sequentially replaced with a new PCa plate. When the new PCa plate is temporarily installed adjacent to the existing or replaced PCa plate, the end height of the temporary PCa plate is higher than the end height of the existing or replaced PCa plate. When the step is low and the step is generated, one end portion has a thickness corresponding to the step, and the other end portion forms a sliding plate having a taper portion where the thickness gradually decreases, and one end portion of the sliding plate And the end of the temporary PCa plate are matched to a predetermined state, the sliding plate is fixed to the upper surface of the end of the temporary PCa plate to eliminate the step, and the temporary PCa plate is When installing, after removing the sliding plate Providing construction methods of PCa plate, characterized by the construction of PCa version temporary.

  According to this configuration, when the height of the end of the temporary PCa plate is lower than that of the existing paved or replaced PCa plate, a thickness corresponding to the step is generated. By fixing the sliding plate to the upper surface of the end portion of the temporary PCa plate, the step of the PCa plate in the temporary construction can be eliminated. And when carrying out the main construction of the temporary PCa plate, after removing the sliding plate, the main construction is performed by adjusting the height or injecting grout.

  According to a second aspect of the present invention, an L-shaped bracket is inserted into a gap between an end portion of the existing paved or replaced PCa plate and an end portion of the temporary PCa plate, and the L-shaped bracket The other side is brought into contact with the upper surface of one end portion of the above-mentioned sliding plate, and further, wedge means is driven between one side of the L-shaped bracket and the end portion of the existing or replaced PCa plate, 2. A PCa plate construction method according to claim 1, wherein a plate is fixed to the upper surface of the end portion of the temporary PCa plate.

  According to this configuration, one side of the L-shaped metal fitting is inserted into the gap between the existing paved or replaced PCa plate and the temporary PCa plate, and the wedge means is driven into this gap, so that The side strongly presses the upper surface of one end portion of the sliding plate, and the sliding plate is fixed to the upper surface of the end portion of the temporary PCa plate.

  The invention according to claim 3 is characterized in that the adjacent PCa plates are connected by a joint device composed of a receiving metal fitting and an insertion fitting that is detachable across the opposed metal fittings, It has a slot for inserting the insertion fitting and a screw part for screwing the bolt provided at the bottom of the slot, and is provided on the bottom surface of the opening recess provided at a predetermined interval on the upper surface of the end of the PCa plate. The groove is exposed to embed the metal fitting, and on the other hand, a bottom of one end portion of the sliding plate is formed with a convex portion that can be fitted into an opening concave portion of the PCa plate, and the sliding On the upper surface of the attaching plate, there are formed a bolt insertion hole penetrating the central portion of the convex portion of the bottom surface, and a counterbore hole in which a head portion of the bolt inserted into the bolt insertion hole is buried, and the sliding plate The other end of the taper has a taper that gradually decreases in thickness toward the other end. And fitting the convex portion of the sliding plate to the opening concave portion of the temporary PCa plate, the end portion of the PCa plate and the one end portion of the sliding plate are positioned in a predetermined state, and The sliding plate is fixed to the upper surface of the end portion of the temporary PCa plate by inserting a bolt into the bolt insertion hole of the sliding plate and screwing it into the screw portion of the bottom of the slot. A PCa plate and a sliding plate used in the construction method according to claim 1 are provided.

  According to this configuration, adjacent PCa plates are connected by the joint device, and an integrated concrete plate is formed. The joint device is composed of a receiving metal fitting and an insertion fitting that is detachable between the opposed receiving metal fittings, and if the convex portion of the sliding plate is fitted into the opening concave portion of the temporary PCa plate, the fitting device is rubbed. One end portion of the plate and the end portion of the temporary PCa plate are positioned in a predetermined state, and further, the bolt is inserted into the bolt insertion hole of the sliding plate and screwed to the screw portion of the receiving bracket, A sliding plate is fixed to the upper surface of the end portion of the temporary PCa plate.

  According to a fourth aspect of the present invention, a plurality of recesses are provided at predetermined intervals on the upper surface in the vicinity of the end of the PCa plate. Forming a portion and fitting the convex portion of the sliding plate into the concave portion of the PCa plate so that the end portion of the PCa plate and the one end portion of the sliding plate can be positioned in a predetermined state. A PCa plate and a sliding plate used in the construction method according to claim 1 are provided.

  According to this configuration, when the convex portion of the sliding plate is fitted into the concave portion of the temporary PCa plate, the one end portion of the sliding plate and the end portion of the temporary PCa plate are positioned in a predetermined state.

  According to a fifth aspect of the present invention, in the upper surface of the sliding plate, a bolt insertion hole that penetrates the center of the convex portion of the bottom surface, and a spot facing in which a head portion of the bolt that is inserted into the bolt insertion hole is buried. A hole is formed, and the concave portion of the PCa plate is provided with a bolt insertion hole serving as a vertical hole for air blow-off at a position corresponding to the bolt insertion hole provided in the convex portion of the sliding plate, and the bolt insertion hole 5. A PCa plate and a sliding plate according to claim 4, wherein a nut is embedded in the inside.

  According to this configuration, when the convex portion of the sliding plate is fitted into the concave portion of the PCa plate, one end portion of the sliding plate and the end portion of the temporary PCa plate are positioned in a predetermined state, and the sliding plate By inserting a bolt into a bolt insertion hole that also serves as a vertical hole for air blow-off provided in the convex portion of the plate, and screwing the bolt into a nut embedded in the concave portion of the PCa plate, the sliding plate becomes a temporary PCa Fixed to the upper surface of the end of the plate.

  According to a sixth aspect of the present invention, there is provided a bolt insertion hole penetrating a central portion of the convex portion of the bottom surface and a spot facing in which a head portion of a bolt inserted into the bolt insertion hole is buried in the upper surface of the sliding plate. 5. The bolt screwed insert is embedded in the concave portion of the PCa plate in a position corresponding to the bolt insertion hole provided in the convex portion of the sliding plate. A PCa plate and a sliding plate are provided.

  According to this configuration, when the convex portion of the sliding plate is fitted into the concave portion of the PCa plate, one end portion of the sliding plate and the end portion of the temporary PCa plate are positioned in a predetermined state, and the sliding plate The sliding plate is fixed to the upper surface of the end portion of the temporary PCa plate by inserting the bolt into the bolt insertion hole provided in the convex portion of the plate and screwing the bolt into the insert embedded in the concave portion of the PCa plate. The

  According to a seventh aspect of the present invention, a horizontal hole for air blow-off is formed on an end side surface of the PCa plate so as to face an end side surface of an adjacent PCa plate. 5. An insertion portion to be inserted into a gap between adjacent PCa plates is suspended, and a horizontal joint insertion hole is provided at a position corresponding to the horizontal hole in the insertion portion. The described PCa plate and rubbed plate are provided.

  According to this configuration, the insertion portion suspended from one end of the sliding plate is inserted into the gap between the existing or replaced PCa plate and the temporary PCa plate, and the convex portion of the sliding plate is inserted into the PCa plate. When fitted into the recess, one end of the sliding plate and the end of the temporary PCa plate are positioned in a predetermined state. Further, the horizontal hole for air blow-off provided in the PCa plate is matched with the horizontal joint insertion hole provided in the insertion portion, and the horizontal joint penetrates from the horizontal hole of one PCa plate to the horizontal hole of the other PCa plate. As a result, the sliding plate is fixed to the upper surface of the end portion of the temporary PCa plate.

  The invention according to claim 8 is characterized in that the sliding plate is divided into a plurality of sheets with respect to the length of the PCa plate. 7. A PCa plate and a sliding plate as described in 7 are provided.

  According to this configuration, the sliding plate is divided into a plurality of sheets with respect to the length of the PCa plate, so that transportation and installation work is easy.

  In the construction method in which the existing pavement is sequentially replaced with a new PCa plate, the height of the end of the temporary PCa plate is lower than that of the existing or replaced PCa plate. In this case, the step of the PCa plate at the time of temporary installation can be eliminated by fixing a sliding plate having a thickness corresponding to the step to the upper surface of the end portion of the temporary PCa plate. As a method of fixing the sliding plate, for example, by inserting one side of an L-shaped bracket into a gap between adjacent PCa plates and driving wedge means, the other side of the L-shaped bracket is one end of the sliding plate. Since the upper surface of the part is strongly pressed, the sliding plate can be easily fixed with a simple configuration.

  Alternatively, in the case of a configuration in which adjacent PCa plates are connected to each other by a joint device constituted by a receiving metal fitting and an insertion fitting that is detachable between the opposed metal fittings, a convex portion provided on the sliding plate Is fitted into the opening recess of the receiving metal fitting so that one end portion of the sliding plate and the end portion of the temporary PCa plate are positioned in a predetermined state, and further, a bolt is inserted into the screw portion of the receiving metal fitting. By screwing, the sliding plate can be fixed to the upper surface of the end portion of the temporary PCa plate.

  In this way, when temporarily installing a new PCa plate, the step can be easily eliminated by a sliding plate without installing a polystyrene foam or the like, and support for moving travel after temporary installation can be achieved. Absent. On the other hand, when the new PCa plate is fully constructed, the sliding plate can be easily removed, so there is no need to temporarily remove the temporary PCa plate, shortening the operation time of the crane and reducing the construction cost. be able to. Moreover, in the conventional construction method, the polystyrene foam was disposed of after a single use. However, the sliding plate according to the present invention can be reused from the viewpoints of resource conservation and environmental protection. It is an invention that exhibits extremely high effects.

Hereinafter, a snowmelt roadbed structure and a snowmelt roadbed construction method according to the present invention will be described with reference to preferred embodiments. Occurs when a new PCa plate is temporarily installed adjacent to an existing or replaced PCa plate in a construction method for replacing a PCa plate continuously laid on an airport runway, apron, or automobile road. In order to eliminate the step to be done with a simple configuration without installing polystyrene foam, etc., and to achieve the purpose of shortening the operation time of the crane and reducing the construction cost,
In the construction method to replace the existing pavement continuously laid on the created roadbed with a new PCa plate in sequence,
When a new PCa plate is temporarily installed adjacent to an existing or replaced PCa plate, the end height of the temporary PCa plate is higher than the end height of the existing or replaced PCa plate. If it ’s low and steps,
One end portion has a thickness corresponding to the step, and the other end portion forms a sliding plate having a tapered portion where the thickness gradually decreases,
Matching one end of the sliding plate and the end of the temporary PCa plate to a predetermined state, fixing the sliding plate to the upper surface of the end of the temporary PCa plate to eliminate the step,
Furthermore, when the temporary PCa plate was fully constructed, the temporary PCa plate was fully constructed after removing the sliding plate.

  FIG. 1 is a plan view showing an airport taxiway 10 as an example of a PCa plate (precast concrete plate) construction method according to the present invention. The guide path 10 is formed by continuously laying a plurality of PCa plates 20 on a constructed roadbed.

  As mentioned above, when refurbishing the airport taxiway 10, work is done at night when no airplanes arrive and depart, but the existing pavement 20 in a limited area is removed little by little and a new PCa version is temporarily installed. Then, at the night of the following day, the PCa plate of the area temporarily set the previous day will be installed. In this embodiment, for example, the repair work has already been completed, and some of the existing areas 11 are left as they are, and the PCa plates 20 in the remaining repair areas 12 are sequentially replaced with new PCa plates. Explain the construction method.

  In this embodiment, the area to be temporarily constructed is replaced by about five PCa plates 20 at a time (overnight), for example, as indicated by the hatched area, and the remaining area is the second or later (next day) The temporary construction or the main construction will be carried out sequentially after the night of

  FIG. 2 is a partial plan view showing PCa plates 20 laid continuously, and FIG. 3 is a partial cross-sectional view showing a cotter-type joint device. The end portions 21 on the four sides of the PCa plate 20 and the end portions 21 on the four sides of the adjacent PCa plate 20 have a gap 22 having a predetermined width, which is determined by a cotter joint device 30 provided at a predetermined interval. It is connected.

  The detailed description of the cotter type joint device 30 is described in the above-mentioned Patent Document 2. However, if the configuration is briefly described, a receiving metal fitting 32 having a slot 31 opened in a C shape in plan view, A cotter 33 having an H-shape in a cross-sectional view in plan view, which is an insertion fitting that can be attached to and detached from a slot formed between the slots 31 of the receiving bracket 32 facing each other.

  The receiving bracket 32 is provided with a threaded portion 34 for screwing a bolt, and a rod-shaped anchor 35 is extended on the back surface, and the receiving bracket 32 is provided at a predetermined interval on the end portion 21 of the PCa plate 20. Buried. The receiving metal fitting 32 is embedded so as to be slightly recessed from the upper surface 23 of the PCa plate 20, and an opening recess 24 is formed on the upper surface of the receiving metal fitting 32. A bolt hole 37 is opened in the flange portion 36 of the cotter 33.

  The PCa plates 20 adjacent to each other with a gap 22 having a predetermined width are inserted with a cotter 33 having an H shape in plan view in a slot having an H shape in plan view formed by the slot 31 of the receiving metal fitting 32 facing each other. Further, the bolt 38 is inserted into the bolt hole 37 of the cotter 33 and screwed into the screw portion 34 provided at the bottom of the slot 31 of the metal fitting 32 so that the cotter 33 receives both of them. It is fixed to the slot 31 of the metal fitting 32 and the adjacent PCa plates 20 are reliably and firmly connected to each other. In addition, although illustration is abbreviate | omitted, after connecting adjacent PCa plates 20, the lid | cover is attached to each said opening recessed part 24, and it covers.

  FIG. 4 is a flowchart showing a procedure up to the temporary construction in the construction method of the PCa plate according to the first embodiment of the present invention. As described above, when the existing pavement in the repair area 12 is sequentially replaced with a new PCa plate, a limited area is temporarily constructed once (overnight). First, the cotter of the cotter type joint device of the PCa plate in the temporary construction area is removed, and the existing pavement in the temporary construction area is sequentially removed (step 1). After the existing pavement is removed, in order to lay a new PCa plate on the exposed roadbed, first a roadbed filler is filled (step 2), and a vinyl sheet is laid thereon (step 3).

  Subsequently, new PCa plates are temporarily suspended by a crane (step 4), and in order to prevent lateral displacement of the temporarily installed PCa plates, cotters are inserted into the cotter-type joint devices of both PCa plates and temporarily connected. (Step 5). In the conventional construction method, before temporarily installing a new PCa plate, a polystyrene foam, a blue sheet, a flameproof sheet, etc. are installed in advance so that the step between the two PCa plates is within a specified value. In the present invention, a new PCa plate is installed on the laid vinyl sheet without installing polystyrene foam or the like.

  For this reason, as shown in FIG. 5 (a), the end height of the newly installed PCa plate 20A is lower than the end height of the existing PCa plate 20 after replacement or after replacement, A step H is generated. In order to eliminate this level difference H, in the present invention, as shown in FIG. 5 (b), a sliding plate 40, which will be described later, is installed on the upper surface of the end portion of the temporary PCa plate 20A where the level difference H has occurred (step). 6).

  The means for fixing the sliding plate 40 will be described in detail later. Further, for convenience of explanation, the existing or replaced PCa plate 20 and the newly installed PCa plate 20A are described with different reference numerals, but they are identical in structure. It is. Hereinafter, unless otherwise specified, it is simply expressed as PCa version 20.

  After the level difference H is eliminated or reduced to a specified value by installing the sliding plate, a cover is installed on the metal fitting of the cotter type joint device to cover the opening (step 7). Further, temporary marking such as a line is performed (step 8), and the temporary construction in the area is completed.

  FIG. 6 is a flowchart showing a procedure in the main construction among the repair work of the PCa plate according to the first embodiment of the present invention. In order to perform the construction of the PCa plate in the area that was temporarily constructed before the previous day, first remove the sliding plate installed on the temporary PCa plate (Step 11), and remove the cover of the cotter joint fitting bracket. Open the opening (step 12).

  Subsequently, the height of the temporary PCa plate is adjusted using a height adjustment bolt or the like, and the step with the existing or exchanged PCa plate is adjusted within a specified value (step 13). Then, the grout material is poured into the lower part of the temporary PCa plate (step 14), and after curing for a predetermined time (step 15), the ends of the adjacent PCa plates are again connected to each other with a cotter joint device. (Step 16), a cover is placed on the metal fitting of the cotter joint device to cover the opening (Step 17). Furthermore, the equipment is cleaned up and cleaned (step 18), and the construction in the area is completed.

  FIG. 7 is a plan view showing an example of the sliding plate 40 according to the first embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along line AA of FIG. One end portion of the sliding plate 40 has a thickness corresponding to the step H, and a convex portion 41 that can be fitted into the opening concave portion 24 of the PCa plate 20 is formed on the bottom surface of the one end portion. On the upper surface of the plate 40, there are formed a bolt insertion hole 42 that penetrates the center of the convex portion 41 on the bottom surface, and a counterbore hole 43 in which the head of the bolt inserted into the bolt insertion hole 42 is buried, A taper portion 44 whose thickness gradually decreases toward the other end portion is formed at the other end portion of the sliding plate 40.

  FIG. 9 is a plan view showing an installation state of the sliding plate 40, and FIG. 10 is a sectional view taken along line BB of FIG. As described above with reference to FIG. 5, in order to eliminate the step H when the new PCa plate 20A is temporarily installed adjacent to the existing or exchanged PCa plate 20, the upper surface of the end portion of the temporary PCa plate 20A is provided. The sliding plate 40 is installed. First, a cotter 33 having an H shape in plan view is inserted from above into a slot having an H shape in plan view formed by the slots 31 of the receiving metal fittings 32 facing each other. The cotter joint device 30 is temporarily connected.

  Next, the convex portion 41 of the sliding plate 40 is fitted into the opening recess 24 of the temporary PCa plate 20A so that the end portion of the temporary PCa plate 20A and the end portion of the sliding plate 40 are in a predetermined state. (In this case, both ends are substantially flush with each other), and after confirming that the level difference between the ends of both PCa plates 20 and 20A is within a specified value, the sliding plate 40 Bolts 38 are inserted into the bolt insertion holes 42 and the bolt holes 37 of the cotter 33, and the ends of the bolts 38 are screwed into the screw portions 34 of the metal fittings 32, whereby the sliding plate 40 is attached to the temporary PCa plate 20A. Fixed to the upper surface of the end.

  In this way, the sliding plates 40 are sequentially arranged and fixed on all the steps of the existing or replaced PCa plate 20 and the PCa plate 20A newly installed temporarily adjacent to the temporary installation area on the 1st. By doing this, it is possible to eliminate all the steps H between the existing or replaced PCa plate 20 and the temporary PCa plate 20A.

  When the temporary construction of the PCa plate 20A is performed in the work process after the next day, the bolt 38 fixing the sliding plate 40 is loosened as described in the flowchart of FIG. The sliding plate 40 is removed from the upper surface of the end of the PCa plate 20A, and the cover of the cotter-type joint device 30 of the existing or replaced PCa plate 20 is removed to open the opening.

  Then, the height of the temporary PCa plate 20A is adjusted using a jack or the like, and the level difference with the existing or replaced PCa plate 20 is adjusted to be within a specified value, and then the lower part of the temporary PCa plate 20A is moved to the lower part. Inject grout material. After curing for a predetermined time, the cotter is placed in a slot in the H-shape in plan view formed by the slots 31 facing each other in the receiving metal 32 provided at the ends of the adjacent PCa plates 20 and 20A. 33 is inserted, a bolt 38 is inserted into the bolt hole 37 of the cotter 33, the bolt 38 is screwed to the screw portion 34 of the metal fitting 32, and the cotter-type joint device 30 is fully connected. And if a cover is installed in the metal fitting 32 of the cotter type joint device 30 to cover the opening, the main construction of the PCa plate 20 in the area is completed.

  Example 1 mentioned above is a construction method when the PCa plates 20 laid in the existing area 11 of the airport taxiway 10 are connected to each other by the cotter type joint device 30, but in Example 2, A construction method in the case where the PCa plates 20 laid in the existing area 11 are connected by a joint of another type different from the cotter joint device such as bolt fastening will be described.

  The construction method of Example 2 is almost the same as that of Example 1 except that the PCa plate 20 is connected by a joint of another type, and the existing pavement in a limited area at night when there is no arrival and departure of an airplane. 20 is removed little by little, and a new PCa plate is temporarily constructed, and the PCa plate in the area where the temporary construction was performed the previous day is applied at night on the next day.

  FIG. 11: is a flowchart which shows the procedure to temporary construction among the construction methods of the PCa plate of Example 2 which concerns on this invention. As in the first embodiment, when the existing pavement in the repair area 12 is sequentially replaced with a new PCa plate, a limited area is temporarily constructed once (overnight). First, the existing pavement in the temporary construction area is removed (step 21). After the existing pavement is removed, in order to lay a new PCa plate on the exposed roadbed, first, a roadbed filler is filled (step 22), and a vinyl sheet is laid thereon (step 23).

  Subsequently, a new PCa plate is temporarily suspended by a crane one by one (step 24), and is rubbed on the upper surface of the end portion of the temporary PCa plate where a step H is generated with respect to the existing PCa plate. A board is installed (step 25). Then, the existing pavement and the temporary PCa plate are temporarily connected by a joint (step 26). Further, temporary marking such as a line is performed (step 27), and temporary construction in the area is completed.

  FIG. 12 is a flowchart showing a procedure in the main construction among the repair work of the PCa plate according to the second embodiment of the present invention. In order to perform the main construction of the PCa plate in the area temporarily constructed before the previous day, first, the sliding plate installed on the temporary PCa plate is removed (step 31), and the joint is temporarily removed (step 32).

  Subsequently, the height of the temporary PCa plate is adjusted using a height adjustment bolt or the like, and the step with the existing or replaced PCa plate is adjusted within a specified value (step 33). Then, the grout material is injected into the lower portion of the temporary PCa plate (step 34), and after curing for a predetermined time (step 35), the ends of the adjacent PCa plates are connected again with a joint (step 36) Further, the equipment is cleaned and cleaned (step 37), and the construction in the area is completed.

  FIG. 13 is an explanatory view showing a sliding plate 40A which is an example of the second embodiment according to the present invention. One end of the sliding plate 40A has a thickness corresponding to the step H, and no bolt hole is formed in the sliding plate 40A. Further, a tapered portion 44A whose thickness gradually decreases in the direction of the other end is formed on the other end of the sliding plate 40A.

  In the second embodiment, since the cotter joint device 30 is not provided on the PCa plate 20 laid in the existing area 11, the sliding plate 40 </ b> A cannot be fixed using the receiving metal fitting 32. For this reason, when eliminating the level difference between the temporary PCa plate 20A using the sliding plate 40A, the end of the temporary PCa plate 20A and the end of the sliding plate 40A are in a predetermined state (in this case, Both ends are positioned substantially flush), and one side 45Aa of the L-shaped bracket 45A is inserted into the gap 22 between the end of the existing PCa plate 20 and the end of the temporary PCa plate 20A, The other side 45Ab of the L-shaped bracket 45A is in contact with the upper surface of one end of the sliding plate 40A, and the wedge means is provided between one side 45Aa of the L-shaped bracket and the end of the existing PCa plate 20. By driving 46A, the other side 45Ab of the L-shaped bracket strongly presses the upper surface of one end of the sliding plate 40A, and the sliding plate 40A is fixed to the upper surface of the end of the temporary PCa plate 20A. The As the wedge means 46A, an air jack may be inserted and expanded in addition to a driving-type wedge.

  Both PCa plates 20 and 20A are provided with a plurality of air venting horizontal holes 47 facing each other at predetermined intervals, and vertical holes 48 communicating with the respective horizontal holes 47 are provided on the upper surface of the PCa plates 20 and 20A. Is open. When the PCa plate 20A is temporarily installed, a horizontal joint 49 is inserted in advance into one horizontal hole 47, air is blown from one vertical hole 48, the horizontal joint 49 is moved, and the horizontal joint 49 is moved to both sides. By passing through the horizontal hole 47, the lateral displacement of the temporary PCa plate 20A is prevented.

  In the work process after the next day, when the temporary PCa plate 20A is actually constructed, the construction is performed according to the procedure described in the flowchart of FIG.

  FIG. 14 is an explanatory view showing a sliding plate 40B which is another example of the second embodiment according to the present invention. One end portion of the sliding plate 40B has a thickness corresponding to the step H, and a tapered portion 44B whose thickness gradually decreases toward the other end portion is formed at the other end portion of the sliding plate 40B. In addition, a plurality of convex portions 41B are provided at predetermined intervals on the bottom surface of the sliding plate 40B, and a bolt insertion hole 42B penetrating the central portion of the convex portion 41B on the bottom surface is provided on the upper surface of the sliding plate 40B. A counterbore 43B is formed in which the head of the bolt inserted into the bolt insertion hole 42B is buried.

  On the other hand, on the upper surface of the PCa plate 20A, a plurality of concave portions 51B that can be fitted to the convex portions 41B are provided at positions corresponding to the convex portions 41B provided on the bottom surface of the sliding plate 40B. Has a bolt insertion hole 50B that also serves as a vertical hole for air blow-off at a position corresponding to the bolt insertion hole 42B of the sliding plate 40B, and a nut 52 is embedded in the lower end portion of the bolt insertion hole 50. .

  In the case where the step of the temporary PCa plate 20A is eliminated by using the sliding plate 40B, the temporary PCa plate can be obtained by fitting the convex portion 41B of the sliding plate 40B into the concave portion 51B of the PCa plate 20A. The end of 20A and one end of the sliding plate 40B are positioned in a predetermined state (in this case, both ends are substantially flush), the bolt insertion hole 42B of the sliding plate 40B and the bolt of the PCa plate 20A The sliding plate 40B is fixed to the upper surface of the end portion of the temporary PCa plate 20A by inserting the bolt 53B through the insertion hole 50 and screwing the bolt 53B into the nut 52B embedded in the PCa plate 20A.

  In this case as well, a temporary joint PCa is formed by inserting a horizontal joint 49 across the horizontal holes 47 through a plurality of air venting horizontal holes 47 provided facing both the PCa plates 20 and 20A. The lateral displacement of the plate 20A is prevented.

  In the work process after the next day, when the temporary PCa plate 20A is actually constructed, the construction is performed according to the procedure described in the flowchart of FIG.

  FIG. 15 is an explanatory view showing a sliding plate 40C which is another example of the second embodiment according to the present invention. One end portion of the sliding plate 40C has a thickness corresponding to the step H, and a tapered portion 44C having a thickness gradually decreasing in the direction of the other end portion is formed at the other end portion of the sliding plate 40C. In addition, a plurality of convex portions 41C are provided at predetermined intervals on the bottom surface of the sliding plate 40C, and a bolt insertion hole 42C penetrating a central portion of the convex portion 41C on the bottom surface is provided on the upper surface of the sliding plate 40C. A counterbore 43C is formed in which the head of the bolt inserted into the bolt insertion hole 42C is buried.

  On the other hand, the upper surface of the PCa plate 20A is provided with a plurality of concave portions 51C that can be fitted into the convex portions 41C at positions corresponding to the convex portions 41C provided on the bottom surface of the sliding plate 40C. Is embedded with a bolt screw-in insert 52C at a position corresponding to the bolt insertion hole 42C of the sliding plate 40C.

  In the case where the step difference of the temporary PCa plate 20A is eliminated using the sliding plate 40C, the temporary PCa plate can be obtained by fitting the convex portion 41C of the sliding plate 40C into the concave portion 51C of the PCa plate 20A. The end of 20A and one end of the sliding plate 40C are positioned in a predetermined state (in this case, both ends are substantially flush), and the bolt 53C is inserted into the bolt insertion hole 42C of the sliding plate 40C. The bolt 53C is screwed into a bolt screwing insert 52C embedded in the PCa plate 20A, so that the sliding plate 40C is fixed to the upper surface of the end portion of the temporary PCa plate 20A.

  In this case as well, a temporary joint PCa is formed by inserting a horizontal joint 49 across the horizontal holes 47 through a plurality of air venting horizontal holes 47 provided facing both the PCa plates 20 and 20A. The lateral displacement of the plate 20A is prevented.

  In the work process after the next day, when the temporary PCa plate 20A is actually constructed, the construction is performed according to the procedure described in the flowchart of FIG.

  FIG. 16 is an explanatory view showing a sliding plate 40D which is another example of the second embodiment according to the present invention. The sliding plate 40D has a thickness corresponding to the step H, and an insertion portion 54D inserted into the gap 22 between the existing PCa plate 20 and the temporary PCa plate 20A is provided at one end of the sliding plate 40D. A tapered portion 44D is formed at the other end of the sliding plate 40D so that the thickness gradually decreases in the direction of the other end.

  Also in this case, both PCa plates 20 and 20A are provided with a plurality of air venting horizontal holes 47 facing each other at predetermined intervals, and vertical holes 48 communicating with the respective horizontal holes 47 are provided in the PCa plate 20. , 20A. A plurality of recesses 51D are provided on the upper surface of the PCa plate 20A at the opening of the vertical hole 48 closer to the end of the PCa plate 20A.

  The bottom surface of the sliding plate 40D is provided with a plurality of convex portions 41B that can be fitted into the concave portions 51D at positions corresponding to the concave portions 51D provided on the top surface of the PCa plate 20A. A horizontal joint insertion hole 55D is opened at a position corresponding to the horizontal hole 47 in the insertion portion 54D.

  In the case where the step of the temporary PCa plate 20A is eliminated by using the sliding plate 40D, the temporary PCa plate can be obtained by fitting the convex portion 41D of the sliding plate 40D into the concave portion 51D of the PCa plate 20A. The end portion of 20A and one end portion of the sliding plate 40D are positioned in a predetermined state (in this case, the insertion portion 54D can be inserted into the gap 22 between both end portions). Then, by inserting a horizontal joint 49 across the horizontal holes 47 through a plurality of air vent horizontal holes 47 provided opposite to both the PCa plates 20 and 20A, the sliding plate 40B is While being fixed to the upper surface of the end portion of the temporary PCa plate 20A, the lateral displacement of the temporary PCa plate 20A is prevented.

  In the second embodiment shown in FIG. 11 to FIG. 16, an existing PCa plate is provided by providing a receiving metal fitting 32 of the cotter joint device 30 in advance on the other end side of the temporary PCa plate 20A. After the replacement of the PCa plate 20 in the area adjacent to 20, the PCa plate 20 in the repair area 12 can be sequentially replaced with a new PCa plate 20A by the same construction method as in the first embodiment. .

  Here, the size and material of the sliding plates 40, 40A, 40B, 40C, and 40D can be arbitrarily set. However, in the experiment, in order to keep the step H within a specified value, the thickness is about 9 mm and the longitudinal direction × width. An iron plate having a direction of about 1500 mm × 200 mm was used. Of course, the thickness of the iron plate or the number of stacked sheets can be arbitrarily changed depending on the level of the step. In addition, the PCa plate 20 is divided into a plurality of sheets, so that it is easy for the operator to carry and the construction is easy.

  Therefore, the sliding plate 40 can be formed of, for example, a lightweight metal material or a synthetic resin such as a reinforced plastic as long as it can withstand a heavy weight traveling such as an airplane. In that case, the weight of the sliding plate 40 becomes lighter, the construction becomes easier, and the construction period can be shortened.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The top view which shows the runway of an airport in an example of the construction method of Example 1 which concerns on this invention. The partial top view which shows the laying state of the PCa plate which concerns on Example 1. FIG. 1 is a partial cutaway view of a cotter type joint device according to Embodiment 1. FIG. The flowchart in the temporary construction of the PCa plate which concerns on Example 1. FIG. Explanatory drawing which shows the level | step difference in the temporary construction of the PCa plate which concerns on Example 1. FIG. The flowchart in this construction of the PCa plate which concerns on Example 1. FIG. FIG. 3 is a plan view illustrating an example of a gluing plate according to the first embodiment. AA line sectional view of Drawing 7. Sectional drawing which shows the installation state of the sliding board which concerns on Example 1. FIG. BB sectional drawing of FIG. 10 is a flowchart for temporary construction of a PCa plate according to a second embodiment. The flowchart in this construction of the PCa plate which concerns on Example 2. FIG. Sectional drawing which shows an example of the gluing board which concerns on Example 2. FIG. Sectional drawing which shows another example of the gluing board which concerns on Example 2. FIG. Sectional drawing which shows another example of the gluing board which concerns on Example 2. FIG. Sectional drawing which shows another example of the gluing board which concerns on Example 2. FIG. The flowchart in the temporary construction of the conventional PCa version. The flowchart in this construction of the conventional PCa version.

Explanation of symbols

10 Taxiway 11 Existing area 12 Repair area 20 Precast concrete plate (PCa version)
20A Newly installed PCa plate 21 4 sides 22 gap 23 upper surface of PCa plate 24 open recess 30 cotter type joint device 31 groove hole 32 receiving metal fitting 33 (insertion metal fitting) cotter 34 screw part 35 anchor 36 flange 37 bolt hole 38 bolt 40 , 40A, 40B, 40C, 40d Sliding plate 41, 41B, 41C, 41D Convex part 42, 42B, 42C Bolt insertion hole 43, 43B, 43C Counterbore 44, 44A, 44B, 44C, 44D Taper part 45A L-shape 45Aa One side 45Ab Other side 46A Wedge means 47 Horizontal hole 48 Vertical hole 49 Horizontal joint 50B Bolt insertion hole 51B, 51C, 51D Recess 52B Nut 52C Insert 53B, 53C Bolt 54D Insertion part 55D Horizontal joint insertion hole

Claims (8)

In the construction method to replace the existing pavement continuously laid on the created roadbed with a new precast concrete plate,
When a new precast concrete plate is temporarily installed adjacent to an existing or replaced precast concrete plate, the end of the temporary precast concrete plate relative to the end height of the existing or replaced precast concrete plate If the height of the part is low and a step occurs,
One end portion has a thickness corresponding to the step, and the other end portion forms a sliding plate having a tapered portion where the thickness gradually decreases,
Matching one end of the sliding plate and the end of the temporary precast concrete plate to a predetermined state, fixing the sliding plate to the upper surface of the end of the temporary precast concrete plate to eliminate the step,
Furthermore, when the temporary precast concrete slab is fully constructed, the temporary precast concrete slab is fully constructed after the sliding plate is removed.   Insert one side of the L-shaped metal fitting into the gap between the end of the existing paved or replaced precast concrete plate and the end of the temporary precast concrete plate, and slide the other side of the L-shaped metal fitting into the gap. Abutting on the upper surface of one end of the attaching plate, and further, wedge means is driven between one side of the L-shaped bracket and the end of the existing or replaced precast concrete plate, and the sliding plate is attached to the temporary plate. The construction method for a precast concrete plate according to claim 1, wherein the precast concrete plate is fixed to an upper surface of an end portion of the precast concrete plate. The adjacent precast concrete plates are connected by a joint device composed of a receiving metal fitting and an insertion fitting that is detachable across the opposite receiving metal fittings,
The receiving metal fitting has a slot for inserting the insertion metal fitting and a screw part for screwing the bolt provided at the bottom of the slot, and is provided at a predetermined interval on the upper surface of the end portion of the precast concrete plate. The groove is exposed on the bottom surface of the recessed opening, and the metal fitting is embedded.
On the other hand, a convex portion that can be fitted into the opening concave portion of the precast concrete plate is formed on the bottom surface of one end portion of the sliding plate, and the central portion of the convex portion of the bottom surface is formed on the upper surface of the sliding plate. A bolt insertion hole that penetrates and a counterbore hole in which a head portion of the bolt inserted into the bolt insertion hole is buried are formed, and the thickness of the other end portion of the sliding plate gradually decreases toward the other end portion. A tapered portion is formed,
The convex portion of the sliding plate is fitted into the opening concave portion of the temporary precast concrete plate, the end portion of the precast concrete plate and the one end portion of the sliding plate are positioned in a predetermined state, and the sliding is further performed. It is formed so that the sliding plate can be fixed to the upper surface of the end of the temporary precast concrete plate by inserting a bolt into the bolt insertion hole of the plate and screwing it into the screw portion of the bottom of the slot. A precast concrete plate and a sliding plate used in the construction method according to claim 1. A plurality of recesses are provided at predetermined intervals on the upper surface near the end of the precast concrete plate,
On the other hand, on the bottom surface of the sliding plate, a plurality of convex portions that can be fitted into the concave portions of the precast concrete plate are formed,
The convex portion of the sliding plate is fitted into the concave portion of the precast concrete plate so that the end portion of the precast concrete plate and the one end portion of the sliding plate can be positioned in a predetermined state. A precast concrete plate and a sliding plate used in the construction method according to claim 1. On the upper surface of the sliding plate, a bolt insertion hole that penetrates the central portion of the convex portion of the bottom surface, and a counterbore hole in which the head of the bolt inserted into the bolt insertion hole is buried,
The concave portion of the precast concrete plate is provided with a bolt insertion hole serving as a vertical hole for air blow-off at a position corresponding to the bolt insertion hole provided in the convex portion of the sliding plate, and a nut in the bolt insertion hole. The precast concrete plate and the sliding plate according to claim 4, wherein: On the upper surface of the sliding plate, a bolt insertion hole that penetrates the central portion of the convex portion of the bottom surface, and a counterbore hole in which the head of the bolt inserted into the bolt insertion hole is buried,
5. The precast concrete plate according to claim 4, wherein a bolt screwing insert is embedded in a concave portion of the precast concrete plate at a position corresponding to a bolt insertion hole provided in a convex portion of the sliding plate. Slip board. On the side surface of the end portion of the precast concrete plate, a horizontal hole for air blow-off is formed facing each end side surface of the adjacent precast concrete plate,
At one end of the sliding plate, an insertion portion to be inserted into a gap with an adjacent precast concrete plate is suspended, and a horizontal joint insertion hole is provided in the insertion portion at a position corresponding to the horizontal hole. The precast concrete slab and the sliding plate according to claim 4, wherein   The precast concrete plate and the slide plate according to claim 3, 4, 5, 6, or 7, wherein the slide plate is divided into a plurality of sheets with respect to the length of the precast concrete plate.

Images