JP5524014B2 - Method of continuously laying two or more precast concrete structures through an ascending slope - Google Patents

Description

  The present invention relates to a method for continuously laying precast concrete structures such as underdrains such as joint grooves provided for water and sewage pipes, electric power lines, underground passages, etc., and L-shaped retaining walls, etc., through an ascending slope.

  For example, as a method of constructing a common ditch (or underdrain) for water supply and sewerage, electric power wiring, various underpasses, etc. directly under an urban trunk road, the ground is first excavated and earthed and precast. A transfer path that extends from the loading point of the box box (pre-cast box culverts such as culverts and fume pipes) to the specified transfer point, and pulls the box box that has been loaded into the underground space with a winch or the like (also referred to as horizontal pulling). However, a method of joining a box and constructing a culvert by transferring it to a predetermined laying position and repeating this step in sequence has been developed and has many achievements.

  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, a protrusion (die steel or a composite of die steel and concrete) mounted on the lower surface of the box is placed directly, and the frictional resistance during the transfer is reduced by the rotation, rolling, etc. of the steel ball. The box is transported to a predetermined laying position in the above posture.

  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 above-described method of constructing a culvert 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. 1-8 can be mentioned.

  These disclosed technologies include a basic invention relating to the above-described series of horizontal drawing methods, an invention for ensuring the attitude of a steel ball that rolls due to the gradient of the transfer path, the invention relating to a grout filling method, and a transfer path. This invention relates to an invention that prescribes the space factor of steel balls in the concave groove material that constitutes the invention, an invention that provides a turntable in the middle of the transfer path, and changes the transfer direction of the box, etc. Is a wide variety.

  By applying the horizontal pulling method described above, the construction of underdrains such as common trenches, etc. under the main roads in urban areas where shortening of the construction period is the highest priority, is as short as possible and safe and efficient. It is done. However, as one of the measures for further shortening the construction period, instead of transferring the boxes one by one, two or more boxes are connected and the connected boxes are connected at once. The present inventors have come up with the idea of a method of transferring to a laying position.

  And the present inventors raised the problem which may arise when connecting and transferring two or more boxes (precast concrete structure), and came to the technical idea which can solve the problem.

  Here, the above-described problem will be described with reference to FIG. The problems raised by the present inventors are, for example, when the transfer path has an ascending slope part, for example, a linearity transition from the flat part to the ascending slope part (illustration example), a linearity transitioning from the descending slope part to the ascending slope part, etc. In the case of the so-called trough crossing, two or more precast concrete structures, K and K, are connected by a tension material T or the like, so that the thickness of the entire box in the traveling direction (one box When the thickness of the kite is t, two of these are connected and the total thickness becomes 2t). As a result, when the box in front of the traveling direction enters this upward slope portion, There is an extremely high possibility of interference with the ascending slope, and this is a problem that the box cannot be transferred due to this interference.

  Thus, it is often assumed that the transfer path has an ascending slope, so-called a valley crossing, and in the case of a so-called mountain crossing that is opposite to the above-described valley crossing, two or more Even if the precast concrete structure is connected and transferred, the above-mentioned problem in this valley crossing transfer path is not possible in view of the problem that the precast concrete structure exceeding the mountain cannot interfere with the transfer path. It is easy to understand that the versatility of the horizontal drawing method described above is further expanded by providing a method for continuously laying two or more precast concrete structures capable of eliminating the above-mentioned problem.

Japanese Patent No. 2879021 JP 2007-332599 A JP 2007-262848 A JP 2005-90226 A JP 2004-225529 A JP 2002-194705 A JP 2002-161573 A JP 2002-88889 A

  The present invention has been made in view of the above-described problems, and even when the transfer path leading to the laying position has an uphill portion in the middle, the precast concrete structure to be transferred and the uphill portion 2 or more precast concrete structures can be transported in an articulated posture without interfering with each other, so that the construction period can be further shortened. The purpose is to provide a method for continuous laying.

  In order to achieve the above object, a method of continuously laying two or more precast concrete structures according to the present invention through an ascending slope, the connected two or more precast concrete structures via at least a transfer path having an ascending slope portion. In the method of transferring to a laying position and continuously laying, the transfer path includes: a base path, a groove-shaped rail disposed in the base path, and a large number of rolling elements arranged in the rail. A method of continuously laying two or more precast concrete structures through an ascending slope, wherein the two or more connected precast concrete structures are transported on the rolling elements by traction means or extrusion means. The two or more precast concrete structures have a gap between each other and at least two places above and below the gap. When the precast concrete structure that is transported on the rolling elements in a posture connected via a gap adjusting material and enters the upward slope portion in the forward direction, the upper gap adjusting material is adjusted by adjusting at least the upper gap adjusting material. When the following precast concrete structure enters the ascending slope, the first attitude adjustment is performed so that the front precast concrete structure has the same inclination as that of the ascending slope. The second gap adjustment is performed by adjusting the lower gap adjusting material to narrow the lower gap, and performing the second posture adjustment in which the subsequent undercarriage is also in the same gradient as the upward gradient portion. The above-mentioned precast concrete structure is transferred to the ascending slope.

  The method of continuously laying two or more precast concrete structures according to the present invention through an ascending slope, particularly when the transport path has an ascending slope part, for example, a longitudinal section that transitions from a flat part to the ascending slope part in the middle thereof In a posture in which two or more precast concrete structures are connected to a transfer path having alignment, a transfer path having a vertical alignment that transitions from a descending gradient portion to the ascending gradient portion in the middle thereof It relates to a method of transferring and continuously laying.

  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. “Continuous laying” means that two or more precast concrete structures are laid continuously while adjoining each other and connected to each other as necessary to construct a predetermined extension of a culvert or retaining wall, etc. I mean. When this precast concrete structure is transferred, 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 excavation method, a temporary roadbed is formed above the transfer space, and the temporary roadbed is provided to a ground traffic road or the like in parallel with continuous laying of two or more precast concrete structures. Is preferred.

  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 base road is a concrete base including, for example, RC structure. In a completed form in which two or more precast concrete structures are continuously laid, the base road and the precast concrete structures connected to each other are mortar, etc. It is integrated via.

  In addition, the groove-shaped rail is, for example, a U-shaped cross section of the cross-section, or a C-shaped steel plate is embedded in the above-mentioned basement path with its opening facing upward, for example, Two rails are arranged at a predetermined interval, and the bottom plate bottom surface of the precast concrete structure to be transferred is transferred so as to be guided by the two rails.

  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-shaped rail without gaps, or may be distributed. However, in order to achieve effective rolling of the steel balls, the steel balls are preferably arranged apart from each other. Further, as disclosed in the above-mentioned publication, a holding layer such as an adhesive mat or a net for holding the steel ball may be disposed in the concave 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. However, when the steel balls are densely arranged in the concave groove, there is no possibility of rolling of the steel balls in the downward gradient portion and the upward gradient portion even if there is no such holding layer.

  In addition, when the rolling element protrudes upward from the concave groove, for example, the flat lower surface of the bottom plate of the precast concrete structure is directly placed and transferred on the rolling element. If it does not protrude from the groove, attach a protrusion or protrusion made of steel mold or the like to the bottom surface of the bottom plate of the precast concrete structure, and a part of it directly contacts the rolling element in the groove. It is good to keep in touch. However, since the precast concrete structure is transferred without derailing the rail, the latter form is preferably selected.

  Two or more connected precast concrete structures are transported while being pulled by a pulling means such as a winch on the transfer path having the above configuration, or are extruded 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 the continuous laying method of the present invention, two or more precast concrete structures are spaced apart from each other (having a play space with each other), and further, a gap adjusting material is provided at least at two locations above and below the gap. The above-mentioned rolling elements are transported in a posture that is connected to each other.

  Here, as an example of the gap adjusting material, a unit of a tension material such as two or more PC steel bars or PC steel wires and a connecting material such as a coupler that connects the tension materials can be given. For example, in a form in which both tendons extend from the opposing side surfaces of the precast concrete structures connected to each other into the gap and the ends of both tendons are joined by a joining material, Adjustments such as narrowing the gap can be achieved while attracting the two tendons together by rotational tightening or the like.

  “Two places above and below the gap” means any level in the upper region and any level in the lower region relative to the central level in the height direction of the precast concrete structure. In addition, two or more gap adjusting materials may be provided in the width direction of the precast concrete structure.

  For example, by adjusting only the upper gap adjusting material and narrowing the upper gap while leaving the lower gap adjusting material as it is, of the two precast concrete structures to be connected, the rear precast concrete structure Remains in a flat posture, and the posture is changed so that the front precast concrete structure is lifted diagonally.

  Then, when the precast concrete structure forward in the traveling direction enters the ascending slope part, the upper gap adjusting material is adjusted to narrow the upper gap, and the front precast concrete structure has the same slope as the ascending slope. The first posture adjustment to the posture is attempted, and then, when the subsequent precast concrete structure enters the ascending slope portion, the lower gap adjustment material is adjusted to similarly narrow the lower gap, The second posture adjustment is performed so that the subsequent precast concrete structure also has the same gradient as the upward gradient. Here, “when entering” means both the timing before the precast concrete structure enters and the timing after the entry, and at least prevents the interference between the precast concrete structure and the uphill portion. The posture adjustment is executed at an appropriate timing.

  By sequentially performing such first and second posture adjustments, not only the precast concrete structure in the rear but also the precast concrete structure in the front in the traveling direction does not interfere with the ascending slope portion, and the ascending slope It can be entered and transferred.

  For example, when the above posture adjustment when three precast concrete structures are connected is outlined, the first posture adjustment is performed with respect to the precast concrete structure ahead in the traveling direction, and then the precast concrete structure ahead The second post-cast concrete structure is adjusted for the second precast concrete structure at an appropriate timing when the object travels the ascending slope portion, and then before and after the last precast concrete structure enters the ascending slope portion. At this time, the second attitude adjustment is performed on the last precast concrete structure. The same applies when four or more precast concrete structures are transported in an articulated posture.

  As described above, according to the method of continuously laying two or more precast concrete structures of the present invention through an ascending slope, the transfer path through which the two or more precast concrete structures to be connected are transported has an ascending slope portion. Even in this case, it is possible to safely and efficiently transfer the ascending slope and the precast concrete structure without causing interference. Therefore, it is possible to efficiently transfer a plurality of precast concrete structures at a time to a complicated longitudinal linear transfer path having an ascending slope, as compared with the conventional continuous laying method of precast concrete structures. The construction conditions can be remarkably wide, and the construction process can be remarkably shortened.

  In addition, a preferred embodiment of a method for continuously laying two or more precast concrete structures according to the present invention through an ascending slope is formed by the first posture adjustment prior to the first posture adjustment. A first gap holding material that holds the lower gap is interposed, and the first gap holding material is removed prior to the second posture adjustment.

  In addition, a preferred embodiment of a method for continuously laying two or more precast concrete structures according to the present invention through an ascending slope is formed by the first posture adjustment prior to the first posture adjustment. A first gap holding material that holds the lower gap and a second gap holding material that holds the upper gap are interposed, and prior to the second posture adjustment, the first gap The holding material and the second gap holding material are removed.

  In the embodiment of the continuous laying method described above, the first gap holding material is interposed in the lower gap in order to ensure the predetermined posture of the precast concrete structure after the posture adjustment for a predetermined time, In addition to this, the second gap holding material is interposed in the upper gap, and the intervening gap holding material is removed at a timing when the holding posture is desired to be released. These gap retaining materials may be attached in advance before or when the precast concrete structure is carried into the transfer path.

  Here, as these first and second gap maintaining materials, for example, an appropriate shaft material including a liner plate, a plate material, and a block material can be applied.

  Further, in a preferred embodiment of the method of continuously laying two or more precast concrete structures according to the present invention through an ascending slope, in the case where the two or more precast concrete structures connected are transferred by traction means, At least the precast concrete structure at the rear of the traveling direction is towed with the position below the center of gravity as the towed point.

  As this embodiment, a through-hole penetrating through the wall of the precast concrete structure is provided at a position lower than the center of gravity of the precast concrete structure ahead in the traveling direction. The form which is inserted in this through-hole and is fixed to the tow point below the wall surface of the precast concrete structure behind the traveling direction or the center of gravity inside the wall can be mentioned. In this way, two or more connected precast concrete structures are pulled by a winch or the like with the position below the center of gravity of the precast concrete structure behind the traveling direction as a towed point, so that the precast concrete at the time of traction transfer It has been confirmed by the present inventors that a stable posture of the structure is guaranteed. In addition, even if it is a form where two or more connected precast concrete structures are towed with the position below the center of gravity of the precast concrete structure ahead in the traveling direction as a towed point, the precast concrete structure at the time of towing transfer Can ensure a stable posture.

  Furthermore, in a preferred embodiment of the method for continuously laying two or more precast concrete structures according to the present invention through an ascending slope, each of the two or more precast concrete structures connected to each other is located in a lower end region in front of the traveling direction. A slope portion is provided, which serves as a means for preventing interference between the precast concrete structure and the upward slope portion.

  As described above, by adjusting the posture of the precast concrete structure ahead of the traveling direction by the first posture adjustment, the interference between the precast concrete structure and the ascending slope is suppressed. In order to ensure prevention with a higher probability, tapered and curved gradient portions are provided in the lower end region in the forward direction of each connected precast concrete structure.

  In addition to the slope portion of the lower end region described above, or as a separate form, a cushioning material and a cushioning material having deformation absorbability are arranged in the lower end region in front of the traveling direction, and a precast concrete structure Even if the object and the ascending slope interfere with each other, the shock at the time of interference may be absorbed by the buffer material or the like.

  As can be understood from the above description, according to the method of continuously laying two or more precast concrete structures of the present invention through an ascending slope, the transfer path through which the precast concrete structure is transferred has a longitudinal section having an ascending slope portion. Even in the case of having a linear shape, two or more precast concrete structures can be transported safely and efficiently at a time without interfering with the ascending slope. It is possible to realize continuous laying construction in a place having a road in as short a construction period as possible.

It is the schematic diagram explaining the situation where two connected precast box culverts are pulled by the pulling means in the method of continuously laying two or more precast concrete structures of the present invention through an ascending slope. (A) Adjusts the precast box culvert ahead of the traveling direction to the same gradient as that of the ascending gradient part before entering the ascending gradient part in the transfer path having a vertical alignment from the flat part to the ascending gradient part. FIG. 6B is a schematic diagram for explaining a situation (first posture adjustment), and FIG. 5B is a diagram illustrating the subsequent precast box culvert when the subsequent precast box culvert enters the upward gradient portion. It is the schematic diagram explaining the condition (2nd attitude | position adjustment) adjusted to the attitude | position of the same gradient. (A), (b) is a figure corresponding to Drawing 2a and b, respectively, and is a figure explaining the situation where the 1st and 2nd gap maintenance material is layered between two precast box culverts. It is. It is the mimetic diagram explaining the situation where two connected precast box culverts are pulled by traction means using other embodiments of a precast box culvert. It is a schematic diagram explaining the situation where the precast box culvert is integrated with the base road at the laying position while providing ground traffic above the transfer space in which the precast box culvert is transferred. It is a figure explaining the transfer method of the conventional precast box culvert, and the pipe body ahead of the traveling direction interferes with the ascending slope part when entering the ascending slope part from the flat part in a posture in which two tubular bodies are connected. It is the schematic diagram explaining the situation which is doing.

  Embodiments of the present invention will be described below with reference to the drawings. In the illustrated example, a precast box culvert is taken up as a precast concrete structure. However, a precast concrete structure other than a box culvert such as an L-type, U-type, or a gate-type retaining wall is used in the laying method of the present invention. Of course, it may be applied. In addition, the illustrated example describes a method of transferring two precast box culverts in a concatenated posture. Of course, three or more precast box culverts may be transferred in a contiguous posture. That is. Moreover, although the example of illustration demonstrates the condition where the connected precast box culvert is transferred the transfer area from a flat part to an up-slope part, a transfer path is a transfer area from a down-slope part to an up-slope part. Of course, the construction method of the present invention can also be applied to a case where two or more precast box culverts are transported in a posture where they are connected in this transport section. Further, the precast box culvert to be transferred is not limited to the configuration and form of the illustrated example, and its internal structure is arbitrary. For example, two or more precast box culverts are stacked to form one unit. It may be configured so that two or more units are transported in a posture connected in the transport direction and integrated with the foundation path at the laying position. Furthermore, in addition to the open-cut method, the shield method and the propulsion method may be applied to construct the transfer space.

  FIG. 1 is a schematic diagram illustrating a situation where two connected precast box culverts are pulled by a traction means in a method of continuously laying two or more precast concrete structures according to the present invention through an ascending slope. FIG. 2 shows that in the order of a and b, in the transfer path having a vertical alignment from the flat portion to the upward gradient portion, the precast box culvert ahead of the traveling direction is the same as the upward gradient portion before entering the upward gradient portion. Schematic diagram explaining the situation (first posture adjustment) adjusted to the attitude of the gradient, and then, when the subsequent precast box culvert enters the ascending gradient section, the subsequent precast box culvert is also an ascending gradient section. The schematic diagram explaining the condition (2nd attitude | position adjustment) currently adjusted to the attitude | position of the same gradient is shown.

  The precast box culvert 1 is a precast RC culvert, a steel culvert, a culvert composed of steel and RC, etc., and a gap connecting both above and below the center level line CL. The connecting members 2 and 2 (gap adjusting materials) for adjustment are provided in the vicinity of each corner. It should be noted that the installation positions and radixes of the upper and lower connecting members 2 and 2 are not limited to the illustrated examples.

  The connecting member 2 is composed of a tension member 21 such as a PC steel rod inserted through a through-hole established in the precast box culvert 1, and an adjusting member 22 such as a coupler connecting the tension members 21 and 21. For example, the tendon 21 is fixed in the wall of the precast box culvert 1 with a wedge fastening material (not shown). Here, as a specific internal configuration of the adjusting member 22 made of a coupler or the like, the forms shown in enlarged views a and b in FIG. 1 can be exemplified. The form shown in the enlarged view a is a form in which the tension members 21 and 21 extend inside the coupler 22 and both are fixed to the coupler 22 via nuts 23 and 23. On the other hand, in the form shown in the enlarged view b, the tension members 21 and 21 extend and come into contact with the inside of the coupler 22, both are fixed to the coupler 22 with nuts 23 and 23, and both contact points are protected by the pipe 24. It is a form to do.

  In the illustrated example, each precast box culvert 1 has four adjustment members 22,..., And any adjustment member 22 is adjusted when adjusting the gap S between the precast box culverts 1, 1 connected to each other. In the embodiment, the length adjustment (gap adjustment) of the tension member 21 may be performed, but the adjustment member 22 is provided only in one of the precast box culverts 1 to be connected. May be.

  By adjusting the lengths of the connecting members 2 and 2 provided above and below the center level line CL with the adjusting members 22 and 22, the upper gap S2 and the lower gap S1 can be adjusted as desired. Can do.

  The bottom plate of the precast box culvert 1 is provided with, for example, a plurality of injection holes 12, 12. When the precast box culvert 1 is transferred to a predetermined laying position, the mortar is formed from the inside of the precast box culvert 1. Etc., and the mortar or the like is filled and cured in the space between the transport path R below and the precast box culvert 1 so that both can be integrated.

  Among the two precast box culverts 1 and 1 connected to each other, a through hole 14 through which the tension material 31 is inserted is provided at a position lower than the center of gravity of the precast box culvert 1 in the forward direction (X direction). A tension member 31 is fixed to a towed point KP below the center of gravity of the precast box culvert 1 in the rearward direction (X direction) through the through hole 14, and the tension member 31 is pulled by a pulling means 3 such as a winch. By being pulled, it is transferred on the two transfer paths R and R.

  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 precast box culvert 1 is suspended in the transfer space IK from, for example, two precast box culverts 1 and 1 are sequentially placed on the transfer paths R and R, both are connected, and the tension member 31 is moved forward in the traveling direction. After connecting to the precast box culvert 1, the transfer is started.

  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 an adhesive mat or a net is arranged in the concave groove, and the positioning is performed by the holding layer. You may accommodate in a ditch | groove with the attitude | position made.

  On the bottom surface of the bottom plate of the precast box culvert 1, there are provided legs 11 and 11 made of cast steel or the like that abuts on the rolling elements R3,... In the two rails R, R. By rolling or rotating the rolling element R3, The legs 11, 11 can move under the frictional resistance reduced as much as possible.

  In the continuous laying method of the present invention, the transfer path R has at least an ascending slope portion, and the precast box culvert 1 to be transported is smoothly transported without interfering with the ascending slope portion. It is characterized by that.

  2A and 2B, the transfer path R has a section composed of a flat portion Ra and an ascending slope portion Rb, and the precast box culvert 1 is transported from the flat portion Ra to the ascending slope portion Rb. The attitude adjustment of No. 1 will be described. In addition to this longitudinal alignment, the transfer path R is a section in which a transition from a descending slope part to an ascending slope part, a transition from a descending slope part to a flat part, and a transition part from a flat part to an ascending slope, Etc., the construction method or the transfer method of the present invention can be applied.

  First, as shown by the one-dot chain line in FIG. 2a, both the precast box culverts 1 and 1 are transported on the flat portion Ra in a posture having a lower gap S1 and an upper gap S2 having the same size. .

  Prior to the transition from the flat portion Ra to the ascending slope portion Rb, the length of the upper connecting member 2 is adjusted to be shorter (by tightening the PC steel rod into the coupler, the tension Q1 is applied to the connecting member 2 for adjusting the gap. The attitude of the precast box culvert 1 in the forward direction of travel is adjusted to an angle similar to the inclination angle of the upward gradient portion Rb: θ. By this posture adjustment, the lower gap S1 is left as it is, and the upper gap is a relatively short S2 '.

  The two precast box culverts 1 and 1 whose postures have been adjusted are pulled by the traction means, and then, as shown in FIG. 2b, when the subsequent precast box culvert 1 enters the ascending slope portion Rb, it is gradually lowered. The length of the connecting material 2 is adjusted (the tension Q2 is generated in the connecting material 2 by screwing the PC steel rod more into the coupler), and the subsequent precast box culvert 1 has the same gradient as the precast box culvert 1 in front. Adjust the posture. By this posture adjustment, the lower gap is the same gap S2 'as the upper gap S1'.

  In this way, when entering the ascending slope portion Rb, by adjusting the postures of the precast box culvert 1 ahead of the traveling direction and the subsequent precast box culvert 1 as desired, both the precast box culverts 1 and 1 are Both can enter the uphill portion Rb without causing any interference with the uphill portion Rb, and the subsequent transfer can be continued.

  FIGS. 3a and 3b are views corresponding to FIGS. 2a and 2b, respectively, in which the first and second gap holding members made of liner plates are interposed between two precast box culverts. FIG.

  In the upper gap S2, a relatively short second gap holding member 42 is attached in advance to one of the precast box culverts 1, and the lower gap S1 has a relatively long first first. Similarly, the gap retaining member 41 is previously attached to one of the precast box culverts 1.

  The first gap holding member 41 and the second gap holding member 42 can guarantee the lower gap S1 and the upper gap S1 ′ at the time of posture adjustment in FIG. It also means that the inclination angle θ of the precast box culvert 1 is guaranteed.

  Next, when the subsequent precast box culvert 1 enters the ascending slope portion Rb, the first gap holding material 41 is removed, and instead, the gap holding of the same length as the second gap holding material 42 is held. By interposing the material 41 ′ in the lower gap S 1 ′, the upper and lower gaps between the two precast box culverts 1, 1 transported through the ascending slope portion Rb can be ensured to the same degree.

  FIG. 4 is a schematic diagram for explaining a situation where two connected precast box culverts are pulled by the traction means using another embodiment of the precast box culvert.

  The precast box culvert 1A shown in the figure has a gradient portion 13 in the lower end region in the front of the traveling direction, and the gradient portion 13 can prevent interference between the precast box culvert 1 and the upward gradient portion Rb with a higher probability. Can be ensured. Although not shown in the figure, in addition to the gradient portion 13 or as a separate form, a cushioning material or a cushioning material is disposed in the lower end region in the front of the traveling direction, and the precast box culvert 1 Even if the ascending slope Rb interferes, the shock at the time of interference may be absorbed by the buffer material or the like.

  FIG. 5 is a schematic diagram for explaining a situation in which the precast box culvert is integrated with the basement road at the laying position while providing ground transportation above the transfer space in which the precast box culvert is transferred.

  As described above, the transfer space IK is formed by excavating the ground by the open-cut method and constructing the earth retaining D, and the transfer path R having the ascending slope portion is formed on the lower surface of the transfer space IK.

  For example, two or more precast box culverts 1,... Suspended from the ground to the loading position in the transfer space IK are connected at the loading point, and the two or more precast box culverts 1,. The transfer path R is transferred to the laying position via the ascending slope portion Rb located at the position.

  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 precast box culvert 1, and this is the space between the precast box culvert 1 and the base road R1, and the rolling between the rails R2. The transfer path R and the precast box culvert 1 can be integrated by filling the space between the moving bodies R3,.

  Two or more connected precast box culverts 1,... Are sequentially transferred and connected to each other to construct a culvert of a predetermined length.

  In addition, a temporary roadbed KR is installed above the transfer space IK, and the temporary roadbed KR is arbitrarily used on the ground in parallel with continuous laying of two or more precast box culverts 1,. It is preferable to be used for transportation.

  According to the above-described method for continuously laying two or more precast concrete structures of the present invention through an ascending slope, even when an ascending slope portion is present in the middle of the transfer path, two or more precast box culverts are provided. Since it is possible to transfer a plurality of units at once without interfering with the up-gradient part in a connected posture, horizontal pulling that further shortens the construction period for various vertical linear transfer paths The construction method can be realized.

  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 1,1A ... Precast box culvert (precast concrete structure), 11 ... Leg, 12 ... Injection hole, 13 ... Gradient part, 2 ... Connection material for gap adjustment (gap adjustment material), 21 ... Tensile material (PC steel rod) ), 22 ... Adjusting material (coupler), 3 ... Traction means (winch), 31 ... Tension material, 41 ... First gap holding material (holding material holding the lower gap), 42 ... Second gap holding material (Holding material that holds the upper gap), S ... gap, S1 ... lower gap, S2 ... upper gap, R ... transfer path, R1 ... base path, R2 ... concave rail, R3 ... rolling element ( Steel balls), Ra ... flat part, Rb ... up slope part, M ... mortar, IK ... transfer space, D ... earth retaining, KR ... temporary roadbed

Claims (8)

In the method of continuously laying two or more connected precast concrete structures to a laying position through at least a transfer path having an ascending slope portion, the transfer path is disposed on the base path and the base path And a plurality of rolling elements arranged in the rail, and the two or more precast concrete structures connected to each other are moved by the traction means or the pushing means. It is a method of continuously laying two or more precast concrete structures to be transported through an ascending slope,
The two or more precast concrete structures are transported on the rolling elements with a gap between each other and at least two positions above and below the gap and connected via a gap adjusting material,
When the precast concrete structure forward in the advancing direction enters the ascending slope part, at least the upper gap adjusting material is adjusted to narrow the upper gap, and the forward precast concrete structure is defined as the ascending slope part. Perform the first posture adjustment with the same gradient posture,
Next, when the subsequent precast concrete structure enters the uphill portion, the lower gap adjustment material is adjusted to narrow the lower gap, and the subsequent precast concrete structure is the same as the uphill portion. The two or more precast concrete structures are transported to the ascending slope of the two or more precast concrete structures connected to each other by performing the second attitude adjustment with a gradient attitude. A method of continuous laying through a gradient.   Prior to the first posture adjustment, a first gap holding material that holds the lower gap formed by the first posture adjustment is interposed, and prior to the second posture adjustment, the The method for continuously laying two or more precast concrete structures according to claim 1 through an ascending slope, wherein the first gap retaining material is removed.   Prior to the first posture adjustment, a first gap holding material that holds the lower gap formed by the first posture adjustment, and a second gap holding material that holds the upper gap. The two or more precast concrete structures according to claim 1, wherein the first gap holding material and the second gap holding material are removed prior to the second posture adjustment. A method of continuous laying through a gradient.   The two or more precast concrete structures connected to each other are transported by traction means, and at least the precast concrete structure at the rear in the traveling direction is towed with a position below the center of gravity as a tow point. A method of continuously laying two or more precast concrete structures according to any one of 1 to 3 through an ascending slope.   Each of the two or more precast concrete structures connected to each other has a slope portion in a lower end region in the front of the traveling direction, and this serves as an interference prevention means between the precast concrete structure and the uphill slope portion. A method for continuously laying two or more precast concrete structures according to claim 1 through an ascending slope.   The method for continuously laying two or more precast concrete structures according to any one of claims 1 to 5 through an ascending slope, wherein the transfer path has a vertical alignment that transitions from a flat part to the ascending slope part. .   6. The two or more precast concrete structures according to any one of claims 1 to 5, wherein the transfer path has a longitudinal linear shape that transitions from a descending slope part to the ascending slope part, and continuously lays through an ascending slope. Method. A transfer space is formed by earthing the excavation wall surface formed by excavating the ground, and the transfer path is arranged on the bottom surface of this transfer space,
The temporary roadbed can be installed above the transfer space, and the temporary roadbed is provided for arbitrary use on the ground in parallel with continuous laying of two or more precast concrete structures. A method of continuously laying two or more precast concrete structures as described above in an upward gradient.

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