JP2004225529A - Continuous laying method for precast concrete slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve efficiency and accuracy in constructing a pavement structure and a roof structure by assembling after efficiently and continuously carrying in a precast concrete slab member up to a prescribed position. <P>SOLUTION: A pavement surface of a pavement section of the prescribed extension is cut up to a base layer of the prescribed depth, and when continuously laying a precast concrete pavement slab 10 on the faired base layer, horizontally laying rails 20 are respectively arranged in the extending direction in both side positions of the pavement section. A friction reducing means of laying a spherical body all over is arranged on an upper surface of the horizontally laying rails 20. A suspension girder 31 is installed between the horizontally laying rails 20 so that a column part 30 is supported by the friction reducing means. A suspension girder 10 is made to travel in the extending direction according to rolling operation of the spherical body on the horizontally laying rails 20 in a state of suspending-holding the pavement slab 10 by the suspension girder 31, and the pavement slab 10 is moved up to a prescribed connecting position of the pavement section, and a part of pavement is constructed by successively connecting and integrating the mutual pavement slabs on the base layer from the innermost part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a method for continuously laying precast concrete slabs, and enables efficient and continuous laying of precast concrete slabs of the same shape such as concrete paving slabs and top slabs used for concrete roofs of facilities. The present invention relates to a method for continuously laying precast concrete slabs.

  The applicant has developed a horizontal drawing method using a bearing ball as a friction reducing means as a rational method of laying a precast concrete product such as a box culvert (see Patent Document 1).

  FIG. 7 is a schematic side view showing a horizontal pulling state of the box culvert as an example of the laying method. As shown in the figure, a horizontal pulling rail 103 is laid along a direction in which a box culvert 102 extends on a foundation concrete 101 constructed in an open tunnel 100. As the horizontal pulling rail 103, a narrow width H-shaped steel or the like whose most part is buried in the concrete 101 in a horizontal state as shown in FIG. 8 is used. One side of the embedded H-section steel web 103a serves as a rail surface, and a flange 103b with a slightly exposed end serves as a side wall. Further, on the rail surface, bearing balls 104 as spherical bodies for reducing friction are arranged so as to be appropriately dispersed. For example, a steel ball having a diameter of about 11 mm is used for the bearing ball 104. On these bearing balls 104, a box culvert 102 having a guide plate 105 made of a thick steel plate fixed to the bottom surface is mounted. The box culvert 102 is point-supported by a number of bearing balls 104 via a guide plate 105. As shown in FIG. 7, as the box culvert 102 is pulled in the direction of the arrow by a horizontal pulling device (not shown) such as a winch, the bearing balls 104 supporting the box culvert 102 roll. Thereby, the dynamic friction between the guide plate 105 and the rail 103 is greatly reduced. According to the experiment, the coefficient of kinetic friction is reduced to 1/4 as compared with the case of the horizontal drawing method such as warping. 7 and 8, the bearing ball 104 is shown enlarged for the sake of explanation.

Japanese Patent No. 2879021.

  The above-described box culvert is continuously laid to construct a pipe in a retaining space provided by cutting a road or the like, but similarly, precast is continuously laid over a predetermined construction section. There is a precast concrete paving slab as a concrete product. Conventionally, these precast concrete paving slabs are conventionally loaded on a 4-ton load truck, suspended from the end of the construction section on a roadbed in order by a traveling crane, and the paving slabs are connected by connecting bolts, and the whole is integrated. It is completed as a plate-shaped structure that has been formed, and finally, the supporting force is maintained by grouting the roadbed with the roadbed.

  Further, as a pavement repair method using the above-described pavement plate, there is a cutting replacement method. This cutting replacement method cuts the pavement damaged by rutting, etc. from the surface layer to a part of the base layer, lays the above-mentioned precast concrete paving slab continuously on the flat shaped base layer after cutting, and spreads In this method, pavement is repaired by further laying surface asphalt on the pavement slabs connected to each other in a state where the pavement is connected.

  On the other hand, as facilities for laying similar plate-shaped concrete slabs, there are known rainwater underground storage facilities and rainwater storage infiltration facilities constructed underground in urban areas as shown in FIG. Have been. As shown in this figure, this kind of underground rainwater storage facility 200 is provided with a storage space effectively in the underground with a predetermined cover when completed, and a park and a parking lot are provided on the ground 201. This rainwater underground storage facility 200 is an underground structure having a flat rectangular overall shape, and as shown in the figure, a plurality of columns of column walls 203 are arranged from a bottom slab 202, and adjacent column walls are arranged. A top plate slab 204 erected between 203 is covered with a buried soil 205, and a ground part 201 is provided.

  By the way, when the above-mentioned cutting replacement method is performed on a service road, it is desirable that a pavement section as long as possible can be repaired within a limited time such as at night. Therefore, there has been a problem how to accurately and quickly lay the precast concrete pavement slab on the cut base layer. At this time, various known techniques for connecting the precast concrete paving slabs have been proposed.However, the transporting machine reciprocates along the base layer portion in front, transports the precast concrete paving slabs to the connecting portion in the back, and sequentially connects. This is a complicated method, and the work is complicated, and when each precast concrete pavement slab is carried to an arbitrary location and laid, there is a problem in the connection accuracy because the positioning of the connection location is performed. .

  Also, precast concrete products with simplified shapes have been widely developed for top slabs of rainwater underground storage facilities and the like in order to streamline construction and the like. In particular, a precast concrete slab having the same shape is suspended from the ground with a crane or the like so as to cover a wide flat surface, and is installed. For this reason, in a rainwater underground storage facility with a large-scale storage space in a plane, it is necessary to use a large crane with a large lifting arm length to suspend the top plate slab, which reduces the efficiency of installation work. There is a problem of bad.

  Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technology, and to efficiently carry in a large-sized precast concrete slab such as a pavement slab and a top slab and to lay the precast concrete slab continuously. To provide a continuous laying method.

  In order to achieve the above object, the present invention cuts a pavement surface of a pavement section having a predetermined extension to a base layer having a predetermined depth, and continuously lays a precast concrete pavement plate on the shaped base layer. In the laying method, on each side of the pavement section, a lateral pulling rail is provided along the extending direction, and friction reducing means is provided by spreading a spherical body on the upper surface of the horizontal pulling rail, between the horizontal pulling rails, A hanging girder is erected so that its legs are supported by the friction reducing means, and the suspension girder is suspended from the paving slab by the hanging girder. The paving slab is moved to the predetermined connecting position of the pavement section by moving the paving slab to the predetermined connecting position of the pavement section, and the paving slab is lowered onto the base layer at the connecting position to separate the paving slabs from each other. And integrated by sequentially connecting from deeper characterized by constructing a portion of the pavement.

  In addition, a continuous precast concrete slab for continuously laying a precast concrete top plate slab on a plurality of column walls constructed in a space defined by an outer wall and constructing a roof structure covering the space above. In the laying method, a horizontal pulling rail is provided on the top end of the adjacent column wall, and a hanging girder is erected between the horizontal pulling rails so that its legs are supported by the friction reducing means. In a state where the top plate slab is hung on the girder, the hanging girder is transferred to a predetermined position with the rolling operation of the spherical body on the horizontal pulling rail, and the top plate slabs are arranged side by side above the underground space. Is covered.

  As described above, according to the present invention, in the target concrete structure, the precast concrete slab can be continuously carried into the area to be laid and accurately set at a predetermined position. This has the effect of significantly improving work efficiency.

  Hereinafter, embodiments of the method for continuously laying precast concrete slabs of the present invention will be described with reference to the accompanying drawings.

[Continuous pavement laying method]
In this embodiment, a pavement slab continuous laying method used for pavement repair work will be described. That is, in the pavement repair work, when the pavement is cut down to the base layer, a part of the base layer and the surface layer are replaced with a precast concrete pavement plate (hereinafter, simply referred to as a pavement plate), and when a new asphalt surface layer 5 is laid, A method for continuously laying the paving slab will be described with reference to FIGS. 1 and 2 as examples.
FIG. 1 and FIG. 2 each show a construction state in which, for example, pavement repair work is performed on a road 1 having a general width (about 6 m). As shown in FIG. 2A, when the surface layer 3 has irregularities 2 due to remarkable rutting, a part of the surface layer 3 and the base layer 4 are cut to a required depth determined by a road surface survey or the like. At this time, as shown in FIG. 1, the repairer divides the surface layer 3 and a part of the base layer 4 by a predetermined length (for example, 30 m) using a cutting machine such as a rotary cutter (not shown). Cutting to the depth, laying of the pavement plate 10 over the entire pavement section, and laying of a new asphalt surface layer 5 (FIG. 2D) are repeatedly performed in the extension direction.

  First, a configuration of a horizontal pulling rail 20 laid on shoulders on both sides of an existing road along a depth direction of the base layer 4 cut and shaped in the above-described range, and a suspension girder running along the horizontal pulling rail 20 Will be described with reference to FIGS. 1, 2 (c) and 3. FIG. As shown in FIG. 3, the horizontal pulling rail 20 is a member in which a large number of bearing balls 23 are spread on a rail surface having a channel steel section. A base plate 24 having a predetermined length in the direction is placed. A girder post 30 is provided upright at a substantially central position of the base plate 24. The girder post 30 is a pillar made of shaped steel, and a suspended girder 31 is installed between two girder posts 30 located across the road so as to be orthogonal to the direction in which the road extends. In this embodiment, the hanging girder 31 is made of an I-beam having a sufficient beam rigidity and high bending rigidity. The hanging girder 31 can move above the base layer 4 along the road extending direction (the direction of the white arrow) by moving the base plate 24 supporting the girder post 30 along the horizontal pulling rail 20. Further, as shown in FIG. 2C, the paving slabs 10 in a state where the two are connected via the hanging wires 32 are kept substantially horizontal at the three hanging point positions of the hanging girder 31. Hanged. In this way, the paving slab 10 is hung by the hanging girder 31 and, as shown in FIGS. Can be moved along the pavement section to be repaired smoothly along the extension direction of the road. At this time, instead of the winding winch 9, it is also possible to provide a drive unit (not shown) for running the girder post 30 on the side of the existing road for the self-running of the hanging girder 31.

  The configuration of the horizontal pulling rail 20 will be described with reference to FIG. 3, the inner surface of the web of the channel steel 21 becomes the rail surface 21a on the bearing plate 25 laid on the shoulder end 1d on both sides of the existing road, as shown in an enlarged manner in FIG. The bearing balls 23 as spherical bodies for reducing friction are arranged on the rail surface 21a so as to be appropriately dispersed on the rail surface 21a. In this embodiment, a steel ball having a diameter of about 11 mm is used for the bearing ball 23. On these bearing balls 23, as shown in FIG. 3, a base plate 24 made of a thick steel plate is mounted on the bottom surface of the girder post, and the base plate 24 is formed by a number of rolling points having a small friction coefficient. In a supported state.

  As shown in FIGS. 1 (a) and 2 (c), the pavement slab 10 is a reinforced concrete slab having a slight transverse gradient from the road center line 1c toward the road side 1b, and is symmetrical with respect to the road center line 1c. Two bolts (not shown) are connected so as to form a shape, and the entire width thereof is substantially equal to the width (6 m in this embodiment) of the pavement section. As shown in FIGS. 1 (a) and 1 (b), the paving slab 10 is suspended on the cut and shaped base layer 4 by a traveling crane 8 stopped at the pavement-completed section 5, and then the suspension girder. 31 is suspended via a suspension wire 32. At this time, the girder posts 30 of the suspension girder 31 are supported by the base plate 11 with low friction on the bearing balls 23, so that the suspension girder 31 suspending the pavement plate 10 extends on the horizontal pulling rail 20 to extend the road. You can move smoothly in the direction. In the present embodiment, as shown in FIG. 1A, a part of the hanging girder 31 has tension wires respectively drawn out from two winding winches 9 installed on the surface layer 3 at the back of the pavement section. W is attached, and the suspension girder 31 is entirely formed with the paving slab 10 as the girder post 30 slides on the horizontal pulling rail 20 in the direction of the winding winch 9 by the synchronous operation of the two winding winches 9. It is designed to be drawn to the back.

  A bolt penetration plate (not shown) is embedded in the notch 10 a at the peripheral edge of the pavement plate 10. The adjacent paving slabs 10 are bolted together via the bolt penetration plate. As a result, as shown in FIG. 1A, the paving slabs 10 sequentially brought in from the inner part of the pavement section to be repaired are bolted in the extending direction, and integrated as a plate structure.

  As for the paving slab 10, the paving slabs 10 laid in order from the back are accurately and sequentially connected with certainty. Further, a grout material such as mortar is filled in a gap portion vacant between the surface of the base layer 4 and a little, and the paving slab 10 is stably installed on the base layer 4. In this pavement repair method, a new asphalt surface layer 5 having a predetermined thickness is paved on the pavement plate 10 after the pavement plate 10 is sequentially laid and connected from the back over the entire length of the pavement section (see FIG. 2 (e)). Construction of the section is completed.

  As described above, the high-quality pavement repair can be performed very quickly since the highly rigid pavement plate 10 can be sequentially and accurately laid from the back in a predetermined pavement repair section.

[Continuous laying method of top slab]
Next, with reference to FIGS. 4 to 6, a continuous laying method of a top slab having a roof structure by covering a space with a slab having the same shape as a top slab will be described.
FIG. 4 is a state explanatory view showing a roof construction in which the top slab 204 of the rainwater underground storage facility 200 shown in FIG. 9 is continuously laid. A column wall 203 is erected at predetermined intervals in an underground space 208 defined by a mountain retaining wall and a permanent outer wall 207, and a horizontal pulling rail 20 is laid at a top position thereof. Further, a suspension girder 31 having a configuration similar to that described with reference to FIGS. 2C and 3 is provided between the adjacent horizontal pulling rails 20 via a girder post 30. Also in the present embodiment, the top plate slab 204 can be moved in the depth direction by suspending the top plate slab 204 with the hanging girder 31 and running on the horizontal pulling rail 20. In the space 208 defined at this time, as shown in FIG. 5, a plurality of pillar rows 203 are juxtaposed at equal intervals. Since the top plate slabs 204 covering the upper part of the space are all the same shape, the horizontal pulling rail 20, the girder post 30, and the hanging girder 31 are used by being rearranged in order on the adjacent column wall 203, so that only the depth direction is used. In addition, the top plate slabs 204 can be efficiently laid in adjacent rows.

  FIG. 6 is a partially enlarged view showing an installation state (see FIG. 5) of the suspension girder 31 for suspending the top plate slab 204 and the horizontal pulling rail 20 on which the girder post 30 supporting the suspension girder 31 runs. As shown in the figure, a bracket 203 a is formed integrally with the pillar wall at the top of the pillar row wall 203. The edges of the top plate slab 204 erected adjacent to both shoulders of the bracket 203a are supported. The horizontal pulling rail 20 is laid on the top end face of the column wall 203. In the present embodiment, a channel steel is used for the horizontal pulling rail 20. This channel is placed on the concrete top face with the web facing down, and a number of bearing balls 23 are arranged in the recesses of the channel. A girder post 30 is erected on each lateral pulling rail 20 so as to be supported by the bearing ball 23 of the lateral pulling rail 20. Suspended girder 31 is provided between the pillar rows so that both sides are supported by the girder post 30. Furthermore, a top slab 204 made of precast concrete is suspended via suspension wires 32 attached to two suspension points of the suspension girder 31. In this state, as shown in FIG. 5, the top slab 204 can be easily transported to the existing installation position by running the suspension girder 31 backward from the suspension position on the near side. Then, the suspension wire 32 may be extended and the supporting side of the top plate slab 204 may be placed on the shoulder of the bracket 203a.

  At this time, a drive mechanism (not shown) for running the suspension girder 31 is attached to both sides of the girder post 30, and a part of the running tire is grounded to the column wall bracket 203a so as to take a running reaction force. The post 30 may move on the bearing ball 23 in a low friction state.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall plan view and a vertical cross-sectional view showing an example in which the present invention is applied to a continuous laying method of a pavement slab as an embodiment of a continuous laying method of a precast concrete slab according to the present invention. The road cross-sectional view which showed typically the construction stage in the continuous laying method of the paving slab shown in FIG. FIG. 3 is an enlarged partial cross-sectional view illustrating the girder post illustrated in FIG. FIG. 1 is an overall plan view showing an example in which the present invention is applied to a continuous laying method of a top slab as an embodiment of a continuous laying method of a precast concrete slab according to the present invention. FIG. 5 is an overall cross-sectional view of the rainwater underground storage facility shown in FIG. 4 taken along the line VV. FIG. 6 is an enlarged partial cross-sectional view showing the top plate slab suspended by the horizontal pulling rail and the suspension girder shown in FIG. 5. The side view which showed an example of the duct laying construction by the box culvert horizontal drawing method. FIG. 8 is a partial front view showing an example of the friction reducing means in the pipe laying work shown in FIG. 7. The perspective view which cuts out and showed a part of the whole structure of the rainwater underground storage facility constructed by assembling the precast concrete member.

Explanation of reference numerals

3 Surface layer 4 Base layer 10 Precast concrete paving slab 20 Lateral pulling rail 23 Bearing ball 30 Girder post 31 Hanging girder

Claims (2)

  In a method for continuously laying a pavement made of precast concrete, a pavement surface of a pavement section having a predetermined length is cut to a base layer having a predetermined depth, and a pavement plate made of precast concrete is continuously laid on the shaped base layer. In each, a lateral pulling rail is provided along the extension direction, and a friction reducing means in which a spherical body is laid on the upper surface of the horizontal pulling rail is provided, and legs between the horizontal pulling rails are supported by the friction reducing means. A hanging girder is erected such that the hanging girder is suspended in the extending direction along with the rolling operation of the spherical body on the horizontal pulling rail in a state where the paving slab is hung on the hanging girder. Moving the pavement slab to a predetermined connection position of the pavement section, lowering the pavement slab on the base layer at the connection position, connecting the pavement slabs sequentially from the back of the same section and integrating them. Continuous laying method precast concrete panel, characterized in that to construct a portion of the instrumentation.   A method for continuously laying a precast concrete slab in which a top slab made of precast concrete is continuously laid on a plurality of column walls constructed in a space defined by an outer wall to construct a roof structure that covers above the space. In the above, a horizontal pulling rail is provided on the top end of the adjacent column wall, and a hanging girder is erected between the horizontal pulling rails so that its legs are supported by the friction reducing means. In a state where the top plate slab is suspended, the hanging girder is transferred to a predetermined position along with the rolling operation of the spherical body on the horizontal pulling rail, and the top plate slabs are arranged and covered above the underground space. A method for continuously laying precast concrete slabs, characterized in that:

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