JP2012092517A - Method of transferring and laying precast concrete structure while changing transfer direction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laying method capable of easily changing the direction of a precast concrete structure to be transferred into an arbitrary direction requested at a bend point part even when a transfer path to a laying position has a bend point part at the right angle or the like or when it is difficult to install a turntable or the like.SOLUTION: The transfer path includes a first rail unit RU1 and a separate second rail unit RU2 comprising two or more recessed groove rails R2 provided together. A box culvert 1 (precast concrete structure) is transferred through the first rail unit RU1 and stopped and lifted at a crossing position CS1 with the second rail unit RU2, a carrying plate 3 is installed to the recessed groove rails R2 constituting the second rail unit RU2 under the box culvert 1, and the box culvert 1 is lowered, mounted on the carrying plate 3 and transferred through the second rail unit. The posture of the box culvert 1 during transfer in the first and second rail units RU1,RU2 is maintained in the same state.

Description

  The present invention relates to a method for transferring and laying precast concrete structures such as underdrains such as joint grooves provided for water and sewer pipes, power lines, underground passages, etc., and L-shaped retaining walls while changing the transfer direction. is there.

  For example, as a method of constructing a common ditch (or underdrain) for water supply and sewerage, electric power wiring, various underground passages, etc. directly under an urban trunk road, currently the ground is excavated in advance and earthed, precast concrete A transfer path that extends from the point where the structure (precast box culvert such as a culvert or fume pipe) is carried to the specified laying point is constructed, and the box carried to the underground space is pulled by a winch (both laterally pulled) In other words, a method has been developed to build a culvert by joining boxes to each other while transporting them to a predetermined laying position and repeating these steps one after another.

  More specifically, the transfer path is made of, for example, a concrete base, and a concave groove material having a U-shaped cross section or a C-shaped steel plate is placed in the base above the opening. It is embedded in a posture facing the surface, and a large number of steel balls are accommodated inside the mold steel. On this steel ball, ridges (mold steel or composite of mold steel and concrete) mounted on the lower surface of the box are directly placed, and the frictional resistance at the time of transfer is reduced by rotation, rolling, etc. of the steel ball. In this posture, the box is transferred to a predetermined laying position.

  Also, for example, a grout filling hole is provided in the bottom plate of the box, and a grout or the like is formed in the space between the bottom plate of the box in the laying position and the transfer path, the gap between the steel balls constituting the transfer path, or the like. By filling and curing, the box and the base constituting the transfer path are integrated, and the box is installed.

  Boxes that are sequentially transferred and installed at the laying position are integrally connected to each other, thereby constructing a culvert having a predetermined vertical alignment and length.

  The method for constructing the undercarriage described above is also called a so-called horizontal pulling method (or box bearing horizontal pulling method), and many related techniques made by the present applicant have been disclosed, for example, disclosed in Patent Documents 1 and 2 Can be mentioned.

  By the way, in the box bearing lateral pulling method described above, at the so-called fold point where the conveyance direction is bent at a right angle or at an arbitrary inclination, the width s1 of the rail Ra is set to the fold point CS as shown in FIG. 11 (width: s2 rail Rb) and gradually changing the travel direction of box K at this break point CS (travel direction: Q1), or as shown in FIG. The precast concrete structure (box K) is entered from the rail Ra onto the turntable T using the turntable T disposed in the box, and the turntable T is rotated as desired (P direction). A method of changing the traveling direction of (a traveling direction: Q2) is common. In particular, Patent Document 3 discloses the latter technique, that is, a technique for changing the traveling direction of a box using a turntable in the box bearing lateral pulling method.

  However, as shown in FIG. 10, in the method of increasing the width of the rail at the break point and gradually changing the traveling direction of the box, it is unavoidable that the radius of rotation of the rail at the break point increases. The rail width in this region becomes too large for a breakpoint at a right angle or an angle close to the right angle, and a situation in which the rail cannot be constructed may occur. In particular, this problem becomes prominent when the bent portion is in a narrow place.

  On the other hand, as shown in FIG. 11, in the method of changing the traveling direction of the box using the turntable disposed at the break point, the surrounding structure or the like is installed when the turntable is installed or rotated. Since it is essential to secure a space that does not interfere, there are multiple fold points in the process of carrying the box, or in conditions where fold points are narrow and a turntable cannot be installed. Its application becomes impossible.

JP 2007-332599 A JP 2007-262848 A JP 2002-161573 A

  The present invention has been made in view of the above-mentioned problems, and when the transfer path leading to the laying position has a fold point portion at a right angle or an angle close to it, the fold point portion is in a narrow place. Even when it is difficult to install a turntable, etc., it is possible to easily change the direction of the precast concrete structure to be transferred in any direction required at the break point, and to transfer the precast concrete structure to the laying position. An object of the present invention is to provide a method for transferring and laying a precast concrete structure while changing the transfer direction, which can be laid sequentially.

  In order to achieve the above object, a method for transferring and laying a precast concrete structure while changing the transfer direction according to the present invention includes a base floor, a concave groove rail disposed on the base floor, When the ridge attached to the lower surface of the precast concrete structure is accommodated in the grooved rail of the transfer path composed of a large number of rolling elements arranged in the In the method for transferring and laying the precast concrete structure to the laying position while the ridges are guided on the rolling elements, the transfer path is separately provided with a first rail unit composed of two or more recessed groove rails. And a second rail unit comprising two or more grooved rails provided side by side, and each grooved rail of one rail unit. The two rail units intersect each other so as to intersect with all the recessed groove rails of the other rail unit, and the precast concrete structure is transferred through the first rail unit to intersect with the second rail unit. Stop and lift at the position, install a transport plate on each of the two or more grooved rails constituting the second rail unit under the lifted precast concrete structure, lower the precast concrete structure and It is placed and fixed on the transport plate, and the pre-cast concrete structure is transported through the second rail unit while the transport plate is guided on the rolling elements in the concave groove rail of the second rail unit. Maintain the same posture of the precast concrete structure during transfer in the first and second rail units It is what is.

  The method of transferring and laying a precast concrete structure while changing the transfer direction according to the present invention, particularly when the transfer path has a fold point at a right angle or an angle close thereto, or when this fold point is in a narrow place In this case, while maintaining the transfer posture of the precast concrete structure in the same state, the transfer direction can be easily changed without using a large-scale device such as a turntable, and the transfer can be continued at a predetermined laying position. It is a method that can be transferred and installed.

  Here, the “precast concrete structure” is a general term for precast concrete structures (concrete structure, RC structure, SRC structure, etc.), and is used for water and water pipes, power wiring, underground passages, and the like. Such as common grooves (cross-sectional shape is rectangular, square, circular, elliptical, etc.), L-shaped, U-shaped, gate-shaped retaining walls, and the like. In addition to laying a precast concrete structure at a desired position, “laying” refers to laying a plurality of precast concrete structures adjacent to each other at a desired position, and It includes constructing a culvert or retaining wall with a predetermined extension by connecting. For example, a culvert formed by connecting a plurality of precast concrete structures (Hakodate) is mainly constructed in the ground such as directly under an arterial road in an urban area. Therefore, when transporting the precast concrete structure, an underground space is constructed by an appropriate method. At that time, a precast concrete structure carrying point (for example, a suspension point from the ground, from the ground to the underground space via a ramp). A transfer path that leads from the starting point of this ramp to the laying position of each precast concrete structure is established at the same time. It is only necessary that the transfer path be completely constructed before the first precast concrete structure is transferred to the laying position, and the transfer of the precast concrete structure is not necessarily started until the transfer path is completed. There is no need to

  Also, the construction method of the underground space is arbitrary, and the underground space may be pre-constructed using an excavator that is applied in the shield method or propulsion method, or the ground part is temporarily occupied, and the excavation method is used. The underground space (transfer space) may be formed by excavating the ground and constructing earth retaining on the excavation wall surface formed by excavating the ground. In the case of applying the open-cut method, it is preferable that a temporary roadbed is formed above the transfer space, and this temporary roadbed is used for a ground traffic road or the like in parallel with the construction of the precast concrete structure.

  Here, the formed transfer path is composed of a base path, a groove-shaped rail disposed in the base path, and a large number of rolling elements arranged in the rail.

  The foundation road is a concrete foundation including, for example, RC structure. In the completed form of the precast concrete structure, a plurality of precast concrete structures interconnected with the foundation road are integrated through mortar or the like. Is. However, when the foundation road and the precast concrete structure do not need to be integrated with mortar or the like, such an integrated construction is unnecessary.

  The groove-shaped rail is, for example, an H-shaped steel or C-shaped steel having a U-shaped cross section embedded in the above-mentioned base road with the opening facing upward. Rails are arranged at predetermined intervals, and two ridges are provided at similar positions on the bottom surface of the bottom plate of the precast concrete structure at positions corresponding to the two rails. The corresponding ridge is accommodated in the groove groove rail, and the precast concrete structure is transferred while being guided by the groove groove rail. For example, each of the two ridges attached to the bottom surface of the bottom plate of the precast concrete structure has a plurality of protrusions made of steel molds, etc., arranged in a straight line intermittently in addition to the form made of one elongated steel mold. The form which is made and is made into a protrusion may be sufficient.

  Here, “two or more recessed groove rails provided side by side” means that two or more recessed groove rails are arranged in parallel at a predetermined interval. Form in which the grooves are arranged in parallel and form in which the three groove grooves are arranged in parallel (the distance between the center groove groove and the left and right groove grooves may be the same or different). The form etc. which four or more ditch | groove rails were arrange | positioned in parallel can be mentioned.

  Furthermore, a large number of rolling elements are arranged in the groove-shaped rail. Here, the rolling element is made of a steel ball such as a ball bearing, and the steel ball may be freely laid in the groove groove rail without gaps, or may be distributed and arranged. In order to achieve effective rolling of the steel balls, it is preferable that the steel balls are arranged apart from each other. Further, a holding layer made of sand, adhesive mat, net or the like for holding the steel ball may be arranged in the groove. Such a configuration in which the steel ball is held by the holding layer is particularly suitable for a linear part in which the steel ball rolls in the absence of the holding layer, such as a descending slope part or an ascending slope part.

  Also, in order to ensure that the precast concrete structure is transported without derailing the rail, the rolling elements are accommodated in the interior of the precast concrete structure without protruding from the groove and attached to the lower surface of the bottom plate of the precast concrete structure. It is preferable that a part of the projected ridge enters the concave groove, and its end face directly contacts the rolling element in the concave groove.

  The precast concrete structure is transferred while being pulled by a pulling means such as a winch or a chill hole on the transfer path having the above-described configuration, or is pushed by an extrusion means such as an extruder from the rear of the precast concrete structure. The transfer means is appropriately selected depending on the alignment (vertical alignment, planar alignment) of the transfer path. A general horizontal pulling method is to pull a precast concrete structure from the front by a pulling means. For example, when a precast concrete structure is transported on a complicated linear transfer path, it is pulled from the front. In such cases, it is effective to extrude the precast concrete structure from the rear using the extrusion means. obtain. As one form of the extruder, it is composed of a main body capable of self-propelling on the transfer path and a hydraulic cylinder mechanism attached to the main body. The main body is fixed to the base path, The hydraulic cylinder mechanism is operated while applying a reaction force to the base path, and the rod is extended forward to extrude the precast concrete structure, and then the main body is fixed to the base path and the main body is moved forward after the rod is received. The process proceeds to the vicinity of the precast concrete structure that has been transferred to the front, and thereafter, the precast concrete structure is transferred while repeating this operation. In descending slopes, it is possible to guarantee the movement of the precast concrete structure in the descending slope by using the winch to lower the precast concrete structure while stretching the wire.

  In the laying method of the present invention, the transfer path through which the precast concrete structure is transferred includes the first rail unit composed of two or more recessed groove rails provided additionally and the two or more recessed groove rails provided separately. At least the second rail unit, and each groove unit of one rail unit intersects all the groove grooves of the other rail unit so that both rail units are in the above-mentioned intersection position (folding). Intersect at point).

  Here, the first rail unit and the second rail unit may intersect at a right angle, may intersect at an angle close to a right angle of about 80 degrees, or may be slightly changed by about 20 degrees. The crossing may be performed in any manner, and any crossing angle can be handled.

  When the precast concrete structure is transferred through the first rail unit and reaches the crossing position with the second rail unit, the transfer is stopped.

  Next, with the posture of the precast concrete structure in the stopped state fixed (without changing the angle of the precast concrete structure, for example), for example, the precast concrete structure is lifted upward while synchronizing a plurality of jacks.

  When the precast concrete structure is lifted to a certain height, the conveying plate is disposed on each of the two or more grooved rails constituting the second rail unit below the precast concrete structure.

  In the form in which the second groove unit comprises the second rail unit, two conveying plates corresponding to the respective groove grooves are applied and positioned in the groove rails under the precast concrete structure. Become.

  After positioning the transport plate in the grooved rail under the precast concrete structure, the precast concrete structure is placed on the transport plate by jacking down, etc., and fixed to these, then the transport plate is attached to the second rail unit. The precast concrete structure is transferred through the second rail unit while being guided on the rolling elements in the grooved rail. As described above, since the transport plate is for transporting the precast concrete structure on the transport plate, it is formed of, for example, a steel material having a high Young's modulus or rigidity, a fiber reinforced resin material such as CFRP or GFRP, or the like. Is preferred.

  In this way, when changing the transfer direction of the precast concrete structure from the first rail unit to the second rail unit intersecting with the first rail unit, the precast concrete structure is moved at the intersection of both rail units. Lift, place the transport plate in two or more grooved rails that constitute the second rail unit, lower the precast concrete structure on it, fix it, and transfer the precast concrete structure through the second rail unit Therefore, there is no need for a large-scale turntable, and there is no problem that the turning angle is limited as in the case of depending only on the width of the groove rail shown in FIG. The direction can be changed very easily.

  In addition, since it is such a direction change form, the attitude | position of the precast concrete structure when the 1st rail unit is transferred, and the attitude | position of the precast concrete structure when the 2nd rail unit are transferred are changed. There is nothing to do. That is, “the precast concrete structure is maintained in the same state” as used herein is a structure in which the precast concrete structure has a hollow such as a box, and the hollow axis is the first. When the precast concrete structure is transported through both the first and second rail units when the longitudinal direction of the first rail unit coincides with the longitudinal direction of the first rail unit, the hollow axis of each of the first and second rail units is the longitudinal length of the first rail unit. It means that it corresponds to the direction, and movement in the vertical direction when jacking up or jacking down is not included in the “post-cast concrete structure posture” here. For example, the precast concrete structure is made to have the first and second pre-cast concrete structures by setting the posture of the pre-cast concrete structure when the first rail unit is transported to the posture when it is finally laid. The posture until the rail unit is transferred and finally laid is maintained in the completely same posture.

  For example, the intermediate position of the second rail unit or its end point position is the laying position of the precast concrete structure, and after the precast concrete structure is transferred to this laying position, the transfer is stopped, The precast concrete structure can be jacked up while the jack is synchronized, the conveying plate can be removed from under the precast concrete structure, and the precast concrete structure can be jacked down to complete the laying.

  The transfer path further includes a third rail unit including two or more grooved rails provided side by side so that each of the grooved rails intersects all the grooved rails of the second rail unit. Both rail units intersect, the precast concrete structure is transported through the first rail unit and the second rail unit, stopped at the crossing position with the third rail unit, lifted, and transport plate Is removed from the bottom of the precast concrete structure, the precast concrete structure is lowered, and the protrusion on the lower surface is accommodated in the groove rail of the third rail unit, and the protrusion is in the groove groove of the third rail unit. The precast concrete structure is transferred through the third rail unit while being guided on the rolling elements of Second, the attitude of the precast concrete structure during the transport in the third rail unit may have a form which is maintained in the same state.

  In this embodiment of the laying method, in addition to the first rail unit and the second rail unit intersecting at a predetermined angle, the second rail unit and a separate third rail unit intersect at a predetermined angle. In this transfer path, the transfer is performed without changing the posture of the precast concrete structure with respect to the rails in the same manner as described above over the first rail unit to the third rail unit.

  The direction change from the first rail unit to the second rail unit is as described above, and then the precast concrete structure is transferred to the crossing position with the third rail unit through the second rail unit. Stop the transfer, lift it up by jacking up, etc. This time, remove the transport plate from under the precast concrete structure, then lower it down by jacking down, etc. It is accommodated in the grooved rail. By pulling the precast concrete structure in this state, each protrusion is transported through the third rail unit while being guided on the rolling elements in the corresponding grooved rail of the third rail unit. It is.

  In this mode, for example, the middle position of the third rail unit or the end position thereof is the laying position of the precast concrete structure, and the transfer is stopped after the precast concrete structure is transferred to this laying position. The laying can be completed by fixing the precast concrete structure at the stop position.

  Thus, since the precast concrete structure can be transferred from the first rail unit through the second rail unit to the third rail unit while changing its direction, a separate fourth rail unit is temporarily installed in the third rail unit. In the case of crossing the rail unit, the transfer plate is used in the same way as when changing the direction from the first rail unit to the second rail unit, and further, the third rail unit to the fourth rail unit are used. What is necessary is just to move a precast concrete structure after aiming at the direction change.

  As described above, in the transfer method of the present invention, it is possible to easily transfer the precast concrete structure to the laying position while changing the direction of the precast concrete structure along the plurality of rail units having different extending directions, and the conveyance used. Since the plate can be diverted as necessary, the construction cost can be reduced as compared with the case of using a turntable or the like.

  In another embodiment of the method for transferring and laying a precast concrete structure while changing the transfer direction according to the present invention, the transfer path is a first rail composed of two or more recessed groove rails provided side by side. And a second rail unit comprising two or more separately provided grooved rails, and each grooved rail of one rail unit is all of the grooved rails of the other rail unit. Both rail units intersect so as to intersect with each other, and a precast concrete structure is placed on a transport plate accommodated in each of two or more concave groove rails constituting the first rail unit, It is transported through the first rail unit while being fixed to the transport plate, stopped at the crossing position with the second rail unit, and precast concrete. The transport plate is lifted, the transport plate is removed from under the precast concrete structure, the precast concrete structure is lowered, and the protrusion on the lower surface is accommodated in the grooved rail of the second rail unit. The precast concrete structure is transferred through the second rail unit while being guided on the rolling elements in the grooved rails of the two rail units, and the precast concrete is transferred in the first and second rail units. The posture of the structure is maintained in the same state.

  In the embodiment of this laying method, when the precast concrete structure is transferred through the first rail unit, the precast concrete structure is transferred in a posture placed on the transfer plate, and the first rail unit and the second rail unit are moved. When the precast concrete structure is jacked up at the intersection and lifted, the transport plate is removed from under the precast concrete structure, and when it is jacked down, the precast concrete structure, for example, into the two concave groove rails of the second rail unit In this laying method, two ridges on the lower surface are accommodated, and when the precast concrete structure is transferred to the second rail unit, the ridge is guided by the grooved rail.

  In this transfer mode, the transfer path further includes a third rail unit composed of two or more recessed groove rails provided side by side, and each recessed groove rail includes all the recessed groove rails of the second rail unit. The two rail units intersect with each other so that the precast concrete structure is transported through the first rail unit and the second rail unit and stopped at the intersection with the third rail unit. Lift up and place two or more transport plates in the area below the raised precast concrete structure in the two or more grooved rails that constitute the third rail unit, and lower the precast concrete structure to lower the two or more transports. Placed on the plate and fixed, while the conveying plate is guided on the rolling element in the grooved rail of the third rail unit The recast concrete structure is transferred through the third rail unit, and the posture of the precast concrete structure during the transfer in the first, second, and third rail units is maintained in the same state. There is also.

  Also, in any embodiment of the laying method described above, among the transport plates used, the precast concrete structure is placed at a position corresponding to each of the plurality of protrusions when placed on the transport plate. It is preferable that concave grooves into which the respective protrusions are fitted are formed, and the protrusions are fitted and fixed onto the concave grooves.

  Although the fixing form of the precast concrete structure to the conveying plate is arbitrary, the conveying plate is fixed by fitting the protrusions on the bottom surface of the bottom plate of the precast concrete structure into the concave groove provided on the conveying plate and fixing both. And the relative displacement between the precast concrete structure and the precast concrete structure extending from the first rail unit to the second rail unit, and in some cases from the first rail unit to the third rail unit. A fixed posture can be secured.

  In addition, regarding the planar angle of the concave groove formed on the conveying plate, for example, when this is made to correspond to the first rail unit and the second rail unit orthogonal to each other, the planar angle of the concave groove is the conveying plate. For example, in the case of corresponding to the first rail unit and the second rail unit intersecting at 60 degrees, the planar angle of the groove is What is necessary is just to form in a 40 degree direction with respect to the longitudinal direction of a conveyance board, and the ditch | groove according to the crossing angle of each rail unit is formed in a conveyance board.

  In addition, when the precast concrete structure is placed on two or more transport plates, the two or more transport plates are connected to each other with a connecting member made of steel or the like, thereby transferring the precast concrete structure. It is preferable because all the conveying plates can move on the grooved rail at the same timing without being displaced relative to the precast concrete structure.

  Moreover, it is preferable that the lower surface of the end portion of the transport plate is provided with a buffer region formed in a taper shape or a curved shape, and by applying the transport plate of this form, the bottom of the precast concrete structure that is lifted When installing the conveyor plate on the rolling element in the grooved rail, the conveyor plate can be installed while sliding on the rolling element in order from the buffer area, and the tip of the conveyor plate interferes with the inside of the recessed groove rail. Therefore, there is no problem that the smooth insertion is hindered or the carrier plate is damaged due to interference.

  Furthermore, when the rail unit is composed of three grooved rails, the first combination of the two grooved rails and the second combination of the two grooved rails are different between the grooved rails. A separate precast concrete structure having a width and corresponding to the width between the groove grooves of each combination may be conveyed.

  This is a laying method corresponding to a case where, for example, a plurality of types of precast concrete structures having different scales are transferred after the first and second rail units are formed. Due to the difference in the scale of the precast concrete structure, for example, the width of the precast concrete structure in the direction orthogonal to the transfer direction, the distance between the two ridges under the bottom slab is different in order to stably transfer each. It will be different between things. In order to transport a plurality of types of precast concrete structures having different intervals between the protrusions through the common rail unit, three or more recessed groove rails each having a combination of recessed groove rails having different intervals are provided for each rail unit. It is necessary to have. For example, if three rows of groove rails are provided in order from the left at 1 m and 1.5 m intervals, the distance between the center groove rail and the right groove rail is 1.5 m, and the left groove rail The distance between the right groove groove and the right groove groove is 2.5 m, so that at least two types of groove groove rails having different distances can be combined.

  By forming in each rail unit in advance three or more grooved rails corresponding to multiple types of precast concrete structures to be transferred, for example, precast concrete structures of different scales can be used while using a common rail unit. One precast concrete structure composed of objects or two or more precast concrete structures can be constructed.

  As can be understood from the above description, according to the method of transferring the precast concrete structure while changing the transfer direction of the present invention, the precast concrete structure can be used even in a narrow work space where a turntable or the like cannot be installed. It is possible to transfer and lay down to a predetermined laying position easily and smoothly while changing the transfer direction to a desired one.

In the method of transferring and laying a precast concrete structure while changing the transfer direction of the present invention, it is a diagram illustrating a state in which the precast concrete structure is pulled by being guided by a grooved rail. (A) is the schematic diagram explaining one Embodiment of the transfer path which consists of a 1st rail unit and a 2nd rail unit, (b) is a 1st rail unit, a 2nd rail unit, and 3rd. It is the schematic diagram explaining one Embodiment of the transfer path which consists of a rail unit. FIG. 2B is a diagram illustrating a method of transferring and laying a precast concrete structure while changing the transfer direction according to the present invention, taking the transfer path of FIG. 2B, and the precast concrete structure is transferred through the first rail unit. It is a figure explaining the state stopped by the crossing position of a 1st rail unit and a 2nd rail unit. FIG. 4 is a diagram illustrating a state in which a precast concrete structure is jacked up at an intersection position following FIG. 3. It is the figure explaining the conveyance board arrange | positioned in the ditch | groove rail which comprises the 2nd rail unit below the jacked-up precast concrete structure. It is the figure explaining the state by which the conveyance plates distribute | arranged to the two ditch | groove rails are mutually connected with the connection material. FIG. 5 is a diagram illustrating a state in which the precast concrete structure is transferred via the second rail unit following FIG. 4. Following the crossing position of the second rail unit and the third rail unit following FIG. 7, the precast concrete structure is transferred to the third rail unit and another precast concrete structure already laid at the laying position. It is the figure explaining the state which is going to be connected. (A), (b) is the schematic diagram explaining other embodiment of the transfer path. It is the schematic diagram explaining the conveyance method of the conventional precast concrete structure, Comprising: It is the figure explaining the method of enlarging the width | variety of a rail at a fold point part and changing the advancing direction of a precast concrete structure gradually. It is the schematic diagram explaining the conveyance method of the conventional precast concrete structure, Comprising: It is the figure explaining the method of applying the turntable and changing the advancing direction of a precast concrete structure.

  Embodiments of the present invention will be described below with reference to the drawings. The illustrated example is a case where a box is taken up as a precast concrete structure. However, the precast concrete structure other than the box such as an L-type, U-type, and a gate-type retaining wall is applied to the laying method of the present invention. Of course, it may be a target. The transfer space shown in the figure is a relatively narrow space, and is intended for construction sites of underdrains that do not have sufficient space for installing a turntable or the like at the position where the rail unit intersects. Of course, the construction method of the present invention can be applied to a construction site having a sufficient space for installing a table or the like, and it is not necessary to install a turntable or the like regardless of the size of the construction site. This is a common merit in that significant cost savings can be realized.

  FIG. 1 illustrates a state in which a box (precast concrete structure) is pulled by being guided by a concave groove rail in the method of transferring and laying a precast concrete structure while changing the transfer direction of the present invention. FIG. 2a is a schematic diagram illustrating an embodiment of a transfer path including a first rail unit and a second rail unit, and FIG. 2b is a diagram illustrating the first rail unit, the second rail unit, and the second rail unit. It is the schematic diagram explaining one Embodiment of the transfer path which consists of a 3rd rail unit.

  The precast box 1 is an RC box, a steel box, a composite box made of steel and RC, and the bottom plate is provided with an injection hole 12. When transported to a predetermined laying position, mortar and the like are filled from the inside of the box 1, and the space between the lower transfer path R and the box 1 is filled and cured, and both are integrated. It can be planned.

  The transfer path R is constructed in a transfer space IK formed by excavating the ground and excavating the excavated wall surface, for example. The box 1 is suspended in the transfer space IK, the wire 21 pulled by the pulling means 2 such as a winch is connected to the box 1, and the box 1 is transferred in the traveling direction (X direction) along the transfer path R. can do. It is also possible to attach a traction jig to the injection hole 12 provided in the bottom plate, wind the end of the wire 21 around the jig, and pull it with a winch or the like.

  Here, the transfer path R is, for example, a concrete base path R1, a concave groove-shaped rail R2 made of C-type steel, H-type steel or the like embedded in the base path R1, and a concave groove of the rail R2. It is comprised from many rolling elements R3 ... which consist of the steel ball etc. which were accommodated.

  The rolling element R3 may be directly accommodated in the concave groove of the rail R2, or a holding layer (not shown) such as sand sand, adhesive mat, or net is arranged in the concave groove, Then, it may be accommodated in the concave groove in a posture in which the positioning is performed.

  On the bottom surface of the bottom plate of the box 1, there are provided ridges 11, 11 made of cast steel abutting on the rolling elements R3,... In the two adjacent rails R, R. The protrusions 11 and 11 can move under the frictional resistance reduced as much as possible by the rotation.

  In the method of transferring and laying a precast concrete structure while changing the transfer direction of the present invention, the transfer direction of the box is changed by a predetermined angle between the transfer start position ST and the final laying position FI. The box is transported along a transfer path having a fold point portion, and the fold point portion is in a narrow place, and a rail widening portion is provided as shown in FIGS. It is a construction method whose main feature is to realize the transfer of a box without having to be provided.

  2a and 2b show an embodiment relating to the planar alignment of the transfer path.

  The transfer path shown in FIG. 2a is a two-way rail unit (first rail unit RU1, second rail unit RU2) orthogonal to the obstacle OB1 (existing building, equipment, etc.) in the transfer space IK. In this case, there is a box laying position FI at the end point of the second rail unit RU2, and a plurality of boxes 1,... Here, the two grooved rails R2 and R2 constituting the first rail unit RU1 intersect with all the grooved rails R2 and R2 of the second rail unit RU2 so that both rail units RU1 and RU2 Crossed.

  As shown in FIG. 1, the box 1 is transferred (Y1 direction) along the two rails R, R extending horizontally in a plan view from the transfer start position ST that is the starting point of the first rail unit RU1. At the crossing position CS1 where the first rail unit RU1 and the second rail unit RU2 intersect at right angles, the transfer of the box 1 is stopped once, and then the transfer direction is changed 90 degrees to change the second rail unit RU2. The box 1 is transferred along (Y2 direction).

  On the other hand, in the transfer path shown in FIG. 2b, the first rail unit RU1 and the second rail unit orthogonal to each other at the intersection position CS1 so as to avoid the two obstacles OB1 and OB2 in the transfer space IK. RU2, and a transfer path composed of a second rail unit RU2 and a third rail unit RU3 that are orthogonal to each other at the intersection position CS2, and the box laying position FI is at the end point of the third rail unit RU3. Here, a plurality of boxes 1,... Are connected, and the underdrain 10 is constructed.

  As in the case of the transfer path in FIG. 2a, the box 1 is transferred along the second rail unit RU2 (Y2 direction), and the box 1 is stopped once at the intersection position CS2, and then the transfer direction. Is turned 90 degrees, and the box 1 is transferred along the third rail unit RU3 (Y3 direction). 2a and 2b, since the initial posture and the final installation posture of the box 1 are maintained in the transfer process in any of the transfer forms of the transfer routes of FIGS. 2a and 2b, The initial posture of the box 1 at the transfer start position ST is 90 degrees different.

  As is clear from FIGS. 2a and 2b, in any transfer path, the width of the rail is relatively increased at the crossing position of the rail unit serving as the break point, or a turntable is provided at this crossing position. There is no means to change direction.

  As described above, this transfer space is a relatively narrow place, there are obstacles as shown in the figure, and there is no room for providing a turntable or the like.

  Therefore, taking up the transfer path in the form shown in FIG. 2b, in the extremely narrow transfer space, the transfer is performed while changing the direction of the box 1 through each rail unit, and the culvert is constructed by laying at the laying position. The construction flow will be described in detail with reference to FIGS.

  At the transfer start position ST, the two ridges 11, 11 of the box 1 are loosely fitted into the corresponding concave groove rails R 2, R 2, and are pulled by the wires 21, 21 as shown in FIG. It is transferred along the rail unit RU1 (transfer of the box 1 indicated by a two-dot chain line in the Y1 direction).

  Then, when the box 1 reaches the crossing position CS1 of the first rail unit RU1 and the second rail unit RU2 orthogonal to each other, it is stopped once. Note that the axial direction L1 of the box 1 when it is transferred by the first rail unit RU1 coincides with the extending direction (or the transfer direction Y1) of the first rail unit RU1, and this axis As will be described later, the center direction L1 is maintained both when the box 1 is transported through the second rail unit RU2 and when it is transported through the third rail unit RU3. The axial direction: L1 is provided, and the box 1 is laid.

  When the box 1 is stopped at the intersection position CS1, a plurality of hydraulic jacks J,... Are arranged using the gap between the bottom of the bottom plate and the base path R1, and these hydraulic jacks J,. As shown in FIG. 4, the box 1 is jacked up to a predetermined height via a hydraulic tuning pump (not shown) (Z1 direction).

  When the box 1 is jacked up by the hydraulic jacks J,..., The two groove grooves R2, R2 constituting the second rail unit RU2 below the box 1 are shown in FIG. The conveyance plate 3 is installed.

  The conveying plate 3 is composed of a main member 31 made of H-shaped steel and concave grooves 32 and 32 into which the two protrusions 11 and 11 are fitted when the jacked down box 1 is placed. The groove 32 is formed by cutting a part of the H-shaped steel and reinforcing it with another plate.

  Further, the transport plate 3 includes a buffer region 31a having a tapered lower end flange. The transport plate 3 slides on the rolling element R3 in order from the buffer region 31a. By disposing on the rolling element R3 in the lower grooved rail R2 (in the Z2 direction), the tip of the conveying plate 3 interferes with the inside of the grooved rail, and the smooth insertion is hindered or interfered. The problem that the transport plate is damaged does not occur.

  When the conveying plates 3 and 3 are inserted into the two concave groove rails R2 and R2, as shown in FIG. 6, the upper flanges of these ends are fixed with bolts 5 with a connecting material 4 made of L-shaped steel. Thus, a transfer means that does not cause a relative deviation from each other is formed. In addition, you may arrange | position the conveyance plates 3 and 3 connected beforehand by the connecting material 4 in the two groove grooves R2 and R2 at a time.

  When the conveying plates 3 and 3 are inserted into the two concave groove rails R2 and R2 constituting the second rail unit RU2 under the jack 1 that is jacked up, the protrusions 11 and 11 of the box 1 are recessed. The box 1 is jacked down on the conveying plates 3 and 3 while being fitted in the grooves 32 and 32, and the conveying plate 3 and the protrusions 11 are fixed with a fixing jig such as a clamp (not shown).

  Next, as shown in FIG. 7, the box 1 is pulled by the pulling means via the wires 21 and 21.

  When the box 1 is pulled, the box 1 is transferred along the grooved rails R2 and R2 constituting the second rail unit RU2 while the conveying plates 3 and 3 slide on the rolling elements R3 (Y2). direction).

  As shown in the figure, the axial direction L1 of the box 1 transported by the second rail unit RU2 is coincident with the axial direction L1 of the box 1 when the first rail unit RU1 is transferred. Yes. That is, during the transfer in the first rail unit RU1, jack-up and jack-down at the crossing position, and further in the second rail unit RU2, the posture of the box 1 is maintained in the same state, and its direction is changed halfway. Never happen.

  When the box 1 reaches the intersecting position CS2 of the second rail unit RU2 and the third rail unit RU3 that are orthogonal to each other, it is stopped once.

  And although illustration is omitted, the box 1 is jacked up at the intersection position CS2, and the transport plates 3 and 3 that have transferred the box 1 with the second rail unit RU2 are removed from under the box 1, The box 1 is jacked down, and the protrusions 11 and 11 are loosely fitted into the recessed rails R2 and R2 constituting the third rail unit RU3.

  In the present embodiment, the end position of the third rail unit RU3 is the culvert laying position, and as shown in FIG. 8, the interior of the boxes 1,... Already laid at the laying position and connected to each other. The traction means is temporarily fixed to the box 1, the box 1 is pulled through the wire 21 and transferred along the third rail unit RU3, and is laid at the laying position and connected to the other box 1. It is. At the laying position, mortar or the like is injected from the inside through an injection hole 12 formed in the bottom plate of the box 1, and this is a space between the box 1 and the base path R1, between the grooved rail R2. The filling path R and the box 1 can be integrated by filling the space between the rolling elements R3,.

  A predetermined length of culvert is constructed by connecting a predetermined number of boxes 1 at the laying position.

  Similarly to the first and second rail units RU1 and RU2, the axial direction of each box 1 constituting the undercarriage is also in the L1 direction, and by applying the laying method according to the present invention, the transfer start position is By adjusting the orientation of the box 1 so that it is in the axial direction when it is finally laid, the initial position of the box 1 is maintained while transferring the transfer path having the break point. It can be transferred to the laying position.

  Moreover, even when the rail units are orthogonal, the transfer direction of the box 1 can be smoothly changed while eliminating the need to install an expensive turntable or the like. In addition, as is clear from each figure, the transfer direction can be changed without using a turntable or the like while maintaining the initial position of the box. Even so, the change of direction is guaranteed.

  9a and 9b are schematic views illustrating another embodiment of the transfer path.

  In the transfer path shown in FIG. 9a, the first rail unit RU1 and the second rail unit RU2 intersect at an inclination angle of θ of 90 degrees or more: θ1, and the second rail unit RU2 and the third rail unit RU3 are similarly 90. After the crossing at an inclination angle of θ or more: θ2, the third rail unit RU3 intersects with a separate fourth rail unit RU4 at the crossing position CS3 at an inclination angle: θ3, and the end position of the fourth rail unit RU4 is laid It is a transfer path of the form where the underdrain 10 is constructed here.

  In this way, the number of rail units constituting the transfer path is arbitrary, the intersection angle is also arbitrary, and the laying method of the present invention can be applied to any combination of rail units. It is possible to transfer to the laying position while changing the transfer direction as desired while maintaining the initial box posture.

  On the other hand, the transfer path shown in FIG. 9b includes three rails Rf, Rs, and Rt in which the first rail unit RU1, the second rail unit RU2, and the third rail unit RU3 that are orthogonal to each other are provided. The interval between the rail Rf and the rail Rs is t1, and the interval between the rail Rf and the rail Rt is t2.

  As described above, each rail unit includes at least three concave groove rails having at least two different widths between rails, so that a rail unit having two types of boxes having different scales (widths) ( It is possible to transport using different rail combinations).

  For example, as shown in the drawing, a relatively wide box 1 is transferred in the Q3 direction from the first rail unit RU1 to the third rail unit RU3, and a laying position that is an end point position of the third rail unit RU3. The underdrain 10 is constructed by connecting to each other.

  On the other hand, the second rail unit RU2 transfers a separate relatively small box 1 'to the end position of the fourth rail unit RU4 consisting of only two rails Rf and Rs via the intersection position CS2. Q4 direction), a separate underdrain 10 'can be constructed by connecting each other.

  In this way, each rail unit has three or more grooved rails, so it is possible to transfer various boxes with different scales using a common rail unit, and narrow transfer. Even in a situation where the transfer path has a break in the space and two or more types of culverts consisting of different types of boxes have to be constructed, they are transferred while changing the direction of transfer of various boxes. Two or more underdrains can be constructed.

  In addition, although illustration is abbreviate | omitted, a conveyance board is provided under the box when the box is transported through the first rail unit, and the box is jacked up at the crossing position with the second rail unit. When the transport plate is removed, the second rail unit moves the box while the box ridges are directly guided on the rolling elements in the grooved rail, and the crossing position with the third rail unit. When the box is jacked up, the transport plate is placed in the grooved rail that forms the third rail unit under the box, and the box placed on the transport plate is used as the third rail unit. The method of transferring to the laying position along may be used. Also in this case, the posture of the box from the transfer start position to the laying position is maintained.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

DESCRIPTION OF SYMBOLS 1,1 '... Hako (precast concrete structure), 2 ... Traction means (winch), 21 ... Wire, 3 ... Conveying plate, 31 ... Main body, 31a ... Buffer area, 32 ... Groove, 4 ... Tying material, 10, 10 '... underdrain, R, Rf, Rs, Rt ... transfer path, R1 ... base road, R2 ... concave groove rail, R3 ... rolling element (steel ball), RU1 ... first rail unit, RU2 ... second Rail unit, RU3 ... third rail unit, RU4 ... fourth rail unit, CS1, CS2, CS3 ... crossing position, ST ... transfer start position, FI ... laying position, OB1, OB2 ... obstacle, J ... jack , IK ... Transfer space, L1 ... Axial direction of box

Claims (8)

A bottom surface of the precast concrete structure in the concave groove rail of the transfer path composed of a base floor, a concave groove rail arranged on the base floor, and a number of rolling elements arranged in the concave rail. In the method of transferring and laying the precast concrete structure to the laying position while the ridges are accommodated and the ridges are guided on the rolling elements when the precast concrete structure is pulled or extruded,
The transfer path includes at least a first rail unit composed of two or more recessed groove rails provided side by side, and a second rail unit formed of two or more recessed groove rails provided separately, and Both rail units intersect so that each groove rail of one rail unit intersects all the groove rails of the other rail unit,
The precast concrete structure is transported through the first rail unit, stopped at the intersection with the second rail unit, and lifted.
A transport plate is installed on each of the two or more grooved rails constituting the second rail unit below the raised precast concrete structure;
The precast concrete structure is lowered and placed and fixed on two or more transport plates, and the transport plate is guided on the rolling elements in the grooved rail of the second rail unit, and the precast concrete structure is moved to the second transport unit. It is transported through the rail unit,
A method of transferring and laying a precast concrete structure while changing the transfer direction, wherein the posture of the precast concrete structure during the transfer in the first and second rail units is maintained in the same state. The transfer path further includes a third rail unit composed of two or more concave groove rails provided side by side, and each of the concave groove rails intersects all the concave groove rails of the second rail unit. Rail unit is crossed,
Transport the precast concrete structure through the first rail unit and the second rail unit, stop at the crossing position with the third rail unit, and lift;
The transport plate is removed from under the precast concrete structure, the precast concrete structure is lowered, and the protrusion on the lower surface is accommodated in the groove groove of the third rail unit, and the protrusion is the groove in the third rail unit. The precast concrete structure is transferred through the third rail unit while being guided on the rolling elements in the rail,
The precast concrete structure is transferred while changing the transfer direction according to claim 1, wherein the posture of the precast concrete structure during the transfer in the first, second, and third rail units is maintained in the same state. How to lay. A bottom surface of the precast concrete structure in the concave groove rail of the transfer path composed of a base floor, a concave groove rail arranged on the base floor, and a number of rolling elements arranged in the concave rail. In the method of transferring and laying the precast concrete structure to the laying position while the ridges are accommodated and the ridges are guided on the rolling elements when the precast concrete structure is pulled or extruded,
The transfer path includes at least a first rail unit composed of two or more recessed groove rails provided side by side, and a second rail unit formed of two or more recessed groove rails provided separately, and Both rail units intersect so that each groove rail of one rail unit intersects all the groove rails of the other rail unit,
A precast concrete structure is placed on the transport plate accommodated in each of the two or more concave groove rails constituting the first rail unit, and is transported through the first rail unit in a state of being fixed to the transport plate. Stop at the intersection with the second rail unit and lift the precast concrete structure,
The transport plate is removed from under the precast concrete structure, the precast concrete structure is lowered, and the protrusion on the lower surface is accommodated in the groove groove of the second rail unit, and the protrusion is the groove in the second rail unit. The precast concrete structure is transferred through the second rail unit while being guided on the rolling elements in the rail,
A method of transferring and laying a precast concrete structure while changing the transfer direction, wherein the posture of the precast concrete structure during the transfer in the first and second rail units is maintained in the same state. The transfer path further includes a third rail unit composed of two or more concave groove rails provided side by side, and each of the concave groove rails intersects all the concave groove rails of the second rail unit. Rail unit is crossed,
Transport the precast concrete structure through the first rail unit and the second rail unit, stop at the crossing position with the third rail unit, and lift;
Each of the two or more grooved rails constituting the third rail unit, the conveying plate is disposed in a region under the raised precast concrete structure,
The precast concrete structure is lowered and placed and fixed on two or more transport plates, and the precast concrete structure is moved to the third rail unit while being guided on the rolling elements in the grooved rail of the third rail unit. It is transported through the rail unit,
The precast concrete structure is transferred while changing the transfer direction according to claim 3, wherein the posture of the precast concrete structure during the transfer in the first, second and third rail units is maintained in the same state. How to lay.   A concave groove into which the ridge is fitted is formed at a position corresponding to the ridge when the precast concrete structure is placed on the conveyance plate, and the ridge is formed on the groove. The method for transferring and laying a precast concrete structure while changing the transfer direction according to any one of claims 1 to 4, wherein the is fitted and fixed.   A method for transferring and laying a precast concrete structure while changing the transfer direction according to any one of claims 1 to 5, wherein two or more transfer plates are connected to each other by a connecting material.   The lower surface of the end portion of the transport plate is provided with a buffer area formed in a taper shape or a curved shape, and while the transport plate is slid on the rolling elements in order from the buffer region, it is under the raised precast concrete structure. The method for transferring and laying a precast concrete structure while changing the transfer direction according to any one of claims 1 to 6, wherein the conveying plate is disposed on a rolling element in a grooved rail.   When the rail unit is composed of three concave groove rails, the first combination of the two concave groove rails and the second combination of the two concave groove rails have different widths between the concave groove rails. A separate precast concrete structure corresponding to the width between the groove grooves of each combination is provided and precast while changing the transfer direction according to any one of claims 1 to 7. A method of transferring and laying concrete structures.

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