JP3981345B2 - Precast assembly underdrain block method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a precast assembly culvert block construction method constructed by a side wall member and a top plate member of a novel structure made of large precast concrete capable of easily assembling a large culvert.
[0002]
[Prior art]
Traditionally, large culverts have been built on site by reinforced concrete. Therefore, the work such as the formwork at the site is complicated, and there is a problem in workability. In order to solve this problem, the present applicant has proposed a number of simple methods for assembling and constructing stacked blocks having a reduced size (Patent Document 1).
In addition, there is known a method of temporarily fixing a screw-in reinforcing bar by screwing a reinforcing bar projecting from a concrete body when connecting a quadrant type box culvert top plate member or side wall member (patent) Reference 2).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-229412 [Patent Document 2]
[Patent Document 1] Japanese Patent Laid-Open No. 2002-348934
The method of Patent Document 1 has no problem with a box culvert that is not too large, but if it is large, there is a problem with the alignment and size adjustment of the reinforcing bars inserted into the block, and in particular, complete waterproofing between the blocks during flood control work Processing was very expensive. In addition, Patent Document 2 provides a space between the inner wall and the outer wall having different heights of the side wall member, and places the top plate member between the upper ends of the inner wall, and fixes and stretches the fixed plate member. Concrete is filled between the inner wall and the outer wall, and the purpose is to make the precast concrete lightweight. However, the hollow part between the inner wall and the outer wall of the side wall member may be damaged during transportation. There was a problem. Further, Patent Document 3 is composed of a top wall portion having a flat surface and both side wall portions, and a joint portion with the top wall portion placed on the upper end of both side wall portions is formed in a mountain shape, and a convex insert joint However, this portion is bonded with a resin adhesive or mortar and has low strength.
In the case of Patent Document 2, it is a method of temporarily fixing a two-part or four-part box culvert, and a tension by a conventional PC steel bar using a screw-in reinforcing bar that is coupled to a screw reinforcing bar previously projected on the concrete body. It is a fixing method that uses threaded reinforcing bars instead of metal fittings.
[0005]
[Problems to be solved by the invention]
The present invention improves the complexity of construction of such a conventional precast underlay block method and the drawbacks of accuracy in the field, and can adjust the thickness of the earth covering by tightening and fixing a plurality of PC steel bars. The thickness of the member can be reduced, and the weight of the entire culvert block can be reduced.
The object of the present invention is to apply compressive stress due to prestressing force to finish the thickness of the side wall member and the top plate member thinly, change the shape of the concave part as a meat stealing part, and fill the concave part of each member on the same surface The purpose is to provide a precast assembly culvert block method that is formed and shortens construction on site and has excellent strength.
Another object of the present invention is to insert a plurality of tension PC steel bars vertically and horizontally to connect the side wall member and the top plate member, and in particular, reduce the amount of on-site cast concrete used for the foundation bottom and reduce the weight. It is to provide a short-term precast assembly culvert block method that can be constructed at low cost.
In particular, the present invention provides a precast assembly culvert block method capable of exhibiting the same strength as the conventional one even if the whole is lightened by incorporating several tension PC steel bars.
[0006]
The said subject of this invention can be achieved by the following structures.
Placed on this upper end in a state of standing upright at a predetermined interval between the side wall member that is made of precast concrete and that has a leg portion extending inward at the bottom and the leg portion that protrudes from the pair of side wall members. In the assembly culvert block method in which a plurality of side wall members and a top plate member form an enclosure and a plurality of them are connected to each other, a compressive stress due to a prestressing force acts on the lateral direction of the top plate member. And a leg plate that opposes the top plate member formed in a concave cross section formed by burying a through PC steel rod to be embedded in a thick part and penetrating a through hole through which the vertical PC steel rod is inserted through the front and rear surfaces A through-hole for inserting a horizontal PC steel rod for connecting the through-holes is drilled in the thick part of the leg, and a through-hole for penetrating the vertical PC steel rod through the lower front and rear surfaces is drilled. The outer side which embeds the tension PC steel bar connected with the top plate member Prepared side wall and the member, the formed recesses in, and a side wall member and these said top plate member Te assembled to form a frame, said top plate member, the transverse through PC steel rod into the through hole of the wall member The vertical cast PC bar is inserted and tightened, and the top plate member and the side wall member are tensioned with the PC steel bar, and the whole is completely integrated by tightening the joints.
[0007]
An object of the present invention is to precast a pair of side wall members having leg portions extending inwardly in a U-shape and a top plate member placed on the upper end in a state where the side wall members are upright with the same predetermined width. In the assembly culvert block, which is made of concrete and formed by connecting the side wall member and the top plate member, and laying the reinforcing bar around the foundation bottom between the leg portions of the side wall member and casting it in the concrete, in the longitudinal direction Through-holes (T1, T2) through which the tensioned PC steel bar (B2) connected to the lower side wall member is inserted into the support part extended downward on both sides, and the PC steel bar (B1) passing through in parallel is tensioned. ) And a through hole (T3) through which a vertical PC steel rod (B3) perpendicular to this is inserted, and compressive stress due to prestressing force acts on the horizontal PC steel rod (B1). A top plate member having a concave cross section, and the top A tension PC steel bar (B4, B5) with a connecting coupler at the tip is embedded at a position facing the through-holes (T1, T2) of the support part of the plate member. A through hole (S1) through which the rod (B6) is inserted is drilled, and a through hole (S2) through which the PC steel rod (B7) is inserted is drilled through the leg portion that is extended in a U-shape, and the outer surface portion is formed. A side wall member having recesses formed therein, and transporting the top plate member and the side wall member, and the top plate is formed on the upper end of both side wall members vertically erected at a predetermined position of the foundation bottom plate at the site. Connecting couplers for tension PC steel bars (B4, B5) in which the lower ends of the tension PC steel bars (B2) inserted in the through holes (T1, T2) of the top plate members are embedded in the side wall members. Tightened and tightened, and a predetermined interval with the leg-shaped U-shaped overhanging portions of the pair of side wall members on both sides inside Of the side wall member arranged oppositely on the foundation bottom plate, passing through the PC steel rod (B7) through the two through holes (S2) of the opposing leg, and fastening and fixing the other. A longitudinal PC steel rod (B6) of a predetermined length that penetrates the plurality of side wall members is inserted into the through hole (S1) at the bottom, and tightened and fastened to integrate each of the side wall members. This can be achieved by constructing a thin foundation floor by placing reinforcing bars on the wall and placing concrete between the legs.
[0008]
The above-mentioned problem of the present invention is that the side wall member, which is produced by precast concrete and has a U-shaped leg portion projecting inwardly from the bottom, and the leg portion projecting from the pair of side wall members face each other, and stands upright at a predetermined interval. In the assembly culvert block method comprising a top plate member placed on the upper end, and a plurality of side wall members and the top plate member forming an enclosure and connecting a plurality of them , a pre-plate is formed in the lateral direction of the top plate member. A top plate formed into a concave cross section formed by embedding a transverse PC steel rod that applies compressive stress due to stress force in the thick part and penetrating through holes through the longitudinal PC steel rod through the front and rear surfaces A through-hole for inserting a transverse PC steel rod for connecting the member and the leg portion facing each other is drilled in the thick portion of the leg portion, and the vertical PC steel rod is inserted through the lower front and rear surfaces. Tensile PC steel that has a through hole and is connected to the top plate member A side wall member in which a concave portion is formed on the outer surface, and the top plate member and the side wall member are assembled to form a frame, and the top plate member and the side wall member A PC steel bar and a vertical PC steel bar are inserted into the through-holes of the steel plate and tightened by tightening, and the top plate member and the side wall member are tensioned with the PC steel rod, and are erected on the foundation bottom face at predetermined intervals. After assembling reinforcing bars in the space between the U-shaped leg portions of the side wall members and placing concrete in between the leg portions and confirming a predetermined concrete strength, the PC of the leg portions of both side wall members The above-mentioned problem can be achieved by a precast assembling culvert block method in which a steel bar is tightened and tightened to form a strong and completely integrated assembly culvert block.
[0009]
In addition, the precast assembly underlay block method of the present invention can generate a prestressing force in advance on the top plate member having a concave cross-section, and can apply a compressive stress, and it is economically inexpensive by changing the concave part of the meat stealing part. It is a structurally reliable construction method.
[0010]
Furthermore, since the thickness of the concrete cast formed on the foundation bottom can be strongly tensioned by a plurality of through PC steel rods that penetrate and adhere to the legs of the side wall member, the thickness of the concrete cast on the site is reduced. Can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a precast underdrain block method according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic explanatory view showing an assembled state of a side wall member and a top plate member on a basic bottom plate of the precast assembly undercut block method of the present invention. FIG. 2 shows a top plate member used in the precast assembly underdrain block method of the present invention. FIG. 3 is a perspective view of a side wall member used in the precast assembly underdrain block method of the present invention. FIG. 4 is an explanatory view of the arrangement of PC steel bars by the precast assembly underdrain block method of the present invention. FIG. 5 is an explanatory view of the arrangement of PC steel bars showing another embodiment of the precast assembly underdrain block method of the present invention. FIG. 6 is an explanatory view of an embodiment of a connecting structure of PC steel bars of the present invention top plate member and side wall member. FIG. 7 is a completed view of the precast assembly underdrain block method of the present invention.
[0012]
The precast underlay block construction method of the present invention will be described based on the embodiments shown in the drawings.
For the production of the precast concrete top plate member 1, based on the design of the top plate member 1 having a concave cross section, two long PC steel bars B1 which are laterally tightened along the longitudinal direction at the thick portion are embedded. A nut is screwed onto both ends of the steel rod and compressed and tightened. A plurality of through-holes T1, T2 of a tension PC steel bar B2, which is a tension joint, are formed in the top plate member 1 along the side surface of the support portion 1a. This number may be three, but four are formed in the drawing. A through hole T3 penetrating in the vertical direction along the side surface is formed perpendicular to the through holes T1 and T2.
[0013]
On the other hand, the side wall member 2 has a U-shaped leg portion projecting inward at the bottom, and the support portions 1a and 1a of the top plate member 1 are placed on the upper end so as to face the through holes T1 and T2. PC steel bars B4 and B5 are embedded, and an intermediate coupler 3 is screwed onto the threaded portion of the tip. The PC steel bar B4 is embedded along the longitudinal direction of the side wall member 2 from the upper end to the bottom. Further, a through hole S1 is formed through the vertical PC steel bar B6 for vertical fastening perpendicular to the PC steel bars B4 and B5 of the side wall member 2, and the thick part of the leg 2a of the side wall member 2 is provided. Are provided with two through holes S2 through which the PC steel rod B7 for lateral fastening is inserted at corresponding positions along the projecting direction.
[0014]
Precast manufacturing of the top plate member 1 having the through holes T1, T2, and T3 through which the PC steel rods are embedded and compressed in advance and the through holes S1 and S2 are similarly inserted. And transported to the assembly site. A resin is applied to the surface of the PC steel bar to be embedded to give rust prevention. (See Figure 6)
[0015]
An in-situ foundation bottom slab 4 laid with a level adjusting embedded rail or the like for positioning the leg 2a of the side wall member 2 at the construction site is formed. The leg portions 2a of the left and right side wall members 2 are made to face each other, and the bottom surfaces of the leg portions 2a are aligned and planted on the embedded rails of the on-site striking foundation bottom plate 4. Although this site-foundation foundation bottom slab 4 is not necessary in the case of ground or the like where flatness is maintained, the surface of the ground is usually uneven. The member 2 is constructed.
A plurality of the side wall members 2 are arranged adjacent to the front and rear surfaces of the side wall members 2 and to closely stand to form a side wall. A PC steel rod B6 is inserted through a through hole S1 formed in the lower portion of each side wall member 2 adjacent to the side wall formed on both sides, and both ends are fastened with nuts and fixed, and provided on the leg portions 2a on both sides. A PC steel rod B7 is inserted into the through hole S2 and is compressed and fixed.
[0016]
On the upper surfaces of the left and right side wall members 2, 2, the PC steel rod B 4, which is placed with the concave portion 1 b of the top plate member 1 having a concave cross section facing upward, is embedded in the upper end surface of the side wall member 2, Tensioned PC steel bars B2 and B3 are inserted into the through holes T1 and T2 of B5 and the top plate member 1 and tightened with nuts, and fixed to the bottom of the through hole T2 of the top plate member 1 and the through hole S2 of the side wall member 2. Insert vertical PC steel bars B1 and B6 for vertical fastening and fix them. At this time, the steel plate B2 and B4 are connected to the connecting portion of the top plate member 1 and the side wall member 2 with the intermediate coupler 3 interposed therebetween, and assembled. This coupling method can be coupled by the method shown in FIG.
The surface of the PC steel bars B4 and B5 of the side wall member 2 may be greased. The intermediate coupler 3 is screwed to the end, the top plate member 1 is placed thereon, the through holes are aligned, and the PC steel rod B2 is screwed into the intermediate coupler 3 to be tensioned.
In this way, the PC steel bars B1, B4, B5 are buried in the through holes in advance at the manufacturing site and compressed, and are connected using the intermediate coupler 3 at the assembly site.
[0017]
At this time, since the through PC steel bar B1 of the top plate member 1 is embedded, the longitudinal direction of the upper end is brought into close contact. On-site striking bottom slab 4 surrounded by legs 2a of side wall members 2 on both sides is knitted and reinforced with bottom plate reinforcing bars 5 to place ready-mixed concrete to form on-site bottom slab 6 (see FIG. 1). ). Thereafter, the PC steel rod B7 is inserted into the through hole S2 of the leg 2a of the side wall member 2 erected on both sides, and the side wall members 2 and 2 are tension-fixed.
[0018]
After the frame body assembly process of the side wall member 2 and the top plate member 1 in FIG. 1 is constructed in the same manner, the rebars are assembled into the recesses 2b of the side wall member 2 and the recesses 1b of the top plate member 1 and assembled. Similarly, the bottom plate rebar 5 is assembled in the portion surrounded by the leg 2a, and the concave portion 2b of the side wall member 2 is covered with the ready-mixed concrete receiving frame to form the outer plate.
On the other hand, an intermediate plate covering the assembled reinforcing bars disposed in the concave portion 1b of the top plate member 1 is disposed at a predetermined interval, and an opening is provided and fixed. Concrete is poured from the opening portion of the top plate member 1 of the frame body formed in this way and placed. The bottom plate reinforcing bars 5 are also constructed by placing concrete.
[0019]
Another embodiment will be described with reference to FIG.
In this embodiment, the concave portion is shallowly formed on the outer side surface of the side wall member 2 with a precast concrete block, the side wall is formed, and the concave portion is similarly provided on the peripheral surface of the top plate member 1, and is assembled and firmly coupled by the PC steel rod. be able to. In this way, the wall thickness is reduced to make it lighter.
[0020]
The side wall member 2 and the top plate member 1 used in the precast assembly undercut block method of the present invention are assembled by inserting a PC steel rod into the thick part of the recess and tensioning it. A number of PC steel bars are inserted through the side wall member 2 and the top plate member 1 to be tensioned. Even if it forms in this way and it does not embed a reinforcing bar in the recessed part 2a of the side wall member 2, the culvert block excellent in intensity | strength can be constructed | assembled.
[0021]
【The invention's effect】
The precast assembly underlay block method of the present invention is a precast concrete side wall member and a top plate member, which are tightened with a predetermined length of PC steel bar penetrating vertically and horizontally to generate a prestress force. Since the thickness can be reduced, the weight can be reduced. Moreover, since the thickness of the concrete of the foundation bottom can be reduced by the compression action of the PC steel bar at the leg portion of the side wall member, an inexpensive underdrain block can be constructed.
[0022]
In addition, the ground force of the structure can be reduced by reducing the weight of the entire large box culvert, and the construction cost can be reduced by reducing the foundation construction cost. In particular, since the vertical PC steel bar and the horizontal PC steel bar are inserted and fixed, the thickness of the side wall member and the top plate member can be reduced, and a culvert block can be constructed in a short period of time.
[0023]
Further, since the PC steel rods are assembled with the through holes of the respective PC steel bars facing each other at the time of assembling at the site, a culvert block according to the designer's wish can be formed.
Moreover, it is possible to inexpensively construct culvert blocks of various sizes and thicknesses using standardized side wall members and top plate members.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view showing an assembled state of a side wall member and a top plate member on a basic bottom plate of the precast assembly undercut block method of the present invention.
FIG. 2 is a top plate member used in the precast assembly culvert block method of the present invention.
FIG. 3 is a perspective view of a side wall member used in the precast assembly culvert block method of the present invention.
FIG. 4 is a schematic illustration of the arrangement of PC steel bars by the precast assembly underdrain block method of the present invention.
FIG. 5 is a schematic arrangement explanatory view of PC steel bars showing another embodiment of the precast assembly underdrain block method of the present invention.
FIG. 6 is a perspective view showing an embodiment of an intermediate coupling connecting method used in the present invention.
FIG. 7 is a completed view of the precast assembly culvert block method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Top plate member 2 Side wall member 3 Intermediate coupler 4 On-site foundation bottom plate 5 Reinforcing bar for bottom plate 6 On-site bottom plate 7 Assembling rebar B1-7 PC steel rod T1, T2, T3 Through hole S1, S2, S3 of side plate member Through hole

Claims (3)

Placed on this upper end in a state of standing upright at a predetermined interval, with the side wall member that is made of precast concrete in a U-shape with the leg part protruding inward at the bottom and the leg part that this pair of side wall member is extended In the assembly culvert block construction method, which is formed by connecting a plurality of side wall members and top plate members to form an enclosure.
A transverse PC steel bar that applies a compressive stress due to prestressing force in the lateral direction of the top plate member is embedded in the thick part, and a through-hole through which the vertical PC steel bar is inserted penetrates through the front and rear surfaces. A through hole through which the top plate member formed into a concave section and a transverse PC steel rod for connecting the opposing leg portion is inserted in the thick portion of the leg portion and penetrates the front and rear surfaces of the lower portion. A side wall member having a recess formed in an outer surface formed by embedding a tension PC steel rod that is formed by penetrating a through hole through which the vertical PC steel rod is inserted and connected to the top plate member;
Manufactures, and said side wall member and these said top plate member to form a Te assembly frame, said top plate member, inserting the transverse through PC steel bars, vertical through PC steel rod into the through hole of the wall member A precast assembling culvert block method characterized in that the top plate member and the side wall member are tensioned with a PC steel bar, and the whole is completely integrated by tightening. A pair of side wall members that have U-shaped leg portions projecting inward at the bottom, and a top plate member that is placed on the upper end in a state where the side wall members stand upright are made of precast concrete with the same predetermined width. In the assembly culvert block formed by connecting the member and the top plate member, and stroking the concrete on the foundation floor between the leg portions of the side wall member and placing it on the concrete site,
A through hole (through which a tensioned PC steel rod (B2) connected to a lower side wall member is inserted into a support portion extended downward on both sides in a tensioned manner and embedded in a PC steel rod (B1) that is passed through in parallel with the longitudinal direction. A plurality of T1 and T2) are drilled, and a through hole (T3) is inserted through the vertical PC steel rod (B3) perpendicular to this, and compression by prestressing force is performed by the horizontal PC steel rod (B1). A top plate member that is formed into a concave cross section by applying stress,
Tensile PC steel bars (B4, B5) provided with a connecting coupler at the tip are embedded in positions facing the through holes (T1, T2) of the support portion of the top plate member, and are vertically passed close to the bottom. A through hole (S1) through which the PC steel bar (B6) is inserted is drilled, and a through hole (S2) through which the PC steel bar (B7) is inserted is passed through the leg portion extending in a U-shape. A side wall member in which a concave portion is formed on the surface portion;
The top plate member and the side wall member are transported, and the top plate member is placed on the upper ends of both side wall members that are erected vertically at a predetermined position of the foundation bottom plate at the site. The lower end of the tension PC steel bar (B2) inserted through each of the through holes (T1, T2) is connected to the connecting coupler of the tension PC steel bar (B4, B5) embedded in the side wall member and tightened. Of the side wall member with the leg-shaped U-shaped overhanging portion facing inward and facing the base bottom plate at a predetermined interval, and passing through the two through-holes (S2) of the opposing leg portion through a PC steel rod ( B7) is inserted and tightened and fixed, and the vertical PC steel rod (B6) having a predetermined length penetrating through the plurality of side wall members is tensioned into the through hole (S1) at the bottom of the side wall members arranged in a continuous manner. and fastening allowed integrating said side wall member, the meditate when co tension rebar between the legs Precast assembled underdrain block method being characterized in that concrete and Da設build a thin underlying bottom plate of thickness between parts. Placed on this upper end in a state of standing upright at a predetermined interval, with the side wall member that is made of precast concrete in a U-shape with the leg part protruding inward at the bottom and the leg part that this pair of side wall member is extended In the assembly culvert block construction method, which is formed by connecting a plurality of side wall members and top plate members to form an enclosure.
A transverse PC steel bar that applies a compressive stress due to prestressing force in the lateral direction of the top plate member is embedded in the thick part, and a through-hole through which the vertical PC steel bar is inserted penetrates through the front and rear surfaces. A through hole through which the top plate member formed into a concave section and a transverse PC steel rod for connecting the opposing leg portion is inserted in the thick portion of the leg portion and penetrates the front and rear surfaces of the lower portion. A side wall member in which a through hole for inserting a vertical PC steel rod is formed, and a meat stealing portion of a concave portion is formed on an outer surface formed by embedding a tension PC steel rod connected to the top plate member;
The top plate member and the side wall member are assembled to form a frame body, and the top plate member and the side-by-side PC steel rod are inserted through the through holes of the side wall member, and the vertical PC steel rod is inserted. Tensioning tightens the top plate member and the side wall member with a PC steel rod, and the assembly rebar is stretched in the space between the bottom U-shaped legs of the side wall member, which stands upright at a predetermined interval on the foundation bottom. After turning round and putting concrete between the legs and confirming the specified concrete strength, tighten the PC steel bars on the legs of both side wall members and tighten the entire assembly undercut block firmly and completely. A precast assembly culvert block construction method characterized by forming.

Images