JP3585567B2 - Concrete product construction method, concrete product and embedded insert - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a concrete product construction method particularly suitable for construction of a large-sized concrete product such as a U-shaped block, an L-shaped retaining wall, a box culvert, etc., a concrete product suitable for carrying out the construction method, and an embedded insert. Things.
[0002]
[Prior art]
Conventionally, the most common method of constructing a concrete product is as follows. First, excavate the soil where the concrete product is to be constructed, and construct the foundation concrete. Next, mortar (empty cement and sand) is laid on the foundation concrete, and concrete products are suspended on it. In this case, even if there is a slight level error, the concrete product must be moved up and down. A wedge or a level adjusting plate is placed under the concrete product, and the level is adjusted by increasing or decreasing the wedge or the level adjusting plate while looking at a level meter, a water thread, or the like. The concrete product is fixed by the hardening of the mortar laid after construction.
[0003]
[Problems to be solved by the invention]
The conventional concrete product construction method is to adjust the level using a wedge or a level adjustment plate, so the basic concrete is essential, and the level adjustment also involves moving the heavy product up and down many times. Therefore, it was complicated and the accuracy was not so good. Furthermore, since the wedge or plate operation for level adjustment is performed from the side of the concrete product, a large work space is required on the side and a large amount of excavation is required.
[0004]
The present invention provides a level adjustment of a concrete product and a filling of a hardening material for fixing the concrete product from above or inside the concrete product, so that the level can be easily and accurately adjusted, and a large work space is provided on a side portion. This eliminates the need for excavation to reduce excavation costs, and also eliminates the need for foundation concrete, thereby improving construction efficiency, reducing construction costs, and realizing safety during heavy construction.
[0005]
[Means for Solving the Problems]
The present invention provides a step of providing a through bolt hole having a thread on an inner surface in at least three places of a bottom plate portion of a concrete product, and screwing a level adjusting bolt having a hollow inside the through bolt hole and having a rotating mechanism at an upper portion. Attaching the concrete product at a predetermined position, rotating the level adjustment bolt by an upper rotating mechanism to adjust the level, and injecting a hardening material from a cavity in the level adjustment bolt to concrete product. A method of constructing a concrete product, characterized by having a step of filling the back side of the concrete product and fixing the concrete product, and a sleeve having a thread inside the bottom plate portion of the concrete product through the bottom plate portion, and A concrete product characterized in that a plate-shaped pedestal is buried by contacting the lower part so as to close the hole of the sleeve, and a thread is formed inside. And a plate-shaped pedestal having a rising cylindrical portion inserted into the sleeve from below and having an insertion hole formed in a lower portion of a cylindrical wall of the rising cylindrical portion. is there.
[0006]
[Action]
In the present invention, the operation of fixing the concrete product with the level adjustment of the concrete product and the hardening material is performed from above or inside the concrete product, and it is not necessary to perform the operation from the side of the concrete product. The amount of excavation can be greatly reduced without the need for a side work space. Since the level is adjusted by rotating the bolt, the level can be adjusted accurately and easily. If a pedestal is used below the level adjustment bolt, foundation concrete is not required, and only the ground work, for example, to the extent that gravel is compacted, may be used. Since the bolt has a cavity inside and uses this cavity as an inlet for the hardening material, there is no need to provide an additional hole for injection, which is reasonable.
[0007]
Factory production of a concrete product having a bottom plate portion of a concrete product, a sleeve having a screw thread penetrating through the bottom plate portion, and a lower portion of the concrete product having a plate-shaped pedestal buried by contacting so as to close a hole of the sleeve. This is installed at a predetermined position on the site, a level adjusting bolt is screwed into the sleeve from above, and the level is adjusted by rotating the bolt and pushing down the pedestal, and the hardening material is injected from the cavity in the adjusting bolt. By hardening the concrete product, the above-mentioned method of the present invention can be easily carried out.
[0008]
An embedding insert consisting of a sleeve having a thread therein and a plate-shaped pedestal having a rising cylindrical portion inserted into the sleeve from below and having an insertion hole formed in a lower portion of a cylindrical wall of the rising cylindrical portion is made of concrete. When buried in the bottom plate portion of the product, the above concrete product of the present invention can be easily manufactured. If the sleeve is formed of an upper cylinder and a lower cylinder having a thread inside the upper cylinder and nested therein, since the total length is variable with the nest, bottom plates of various thicknesses can be formed by one standard. Can be used for
[0009]
【Example】
Hereinafter, the present invention will be described in detail with reference to the drawings showing examples. FIG. 1 is an explanatory view of the construction of the U-shaped block 1 of the present invention by the method of the present invention, FIG. 2 is a plan view of the U-shaped block 1, and FIG. FIG. 4 is a partial sectional view of the mold 22 of the U-shaped block 1 in a state where the embedded insert 2 is mounted, FIG. 5 is a side view showing a right half of the level adjusting bolt 11 in a longitudinal section, and FIG. FIG. 7 is a sectional view of the box culvert 30, and FIG. 8 is a sectional view of the L-shaped retaining wall 40.
[0010]
The U-shaped block 1 is an embodiment of the concrete product of the present invention. As shown in FIG. 2, as shown in FIG. A concave portion 21 is formed in the portion for easy repair. The insert 2 (through bolt hole) may be provided at any number of locations as long as the location is three or more.
[0011]
As shown in FIG. 4, the U-shaped block 1 is manufactured by attaching the embedded insert 2 to the formwork 22 and pouring concrete into the formwork 22, but the U-shaped block is usually turned upside down. It is manufactured in a state, and the upper surface (actually, the bottom surface) becomes the leveling surface 27. The embedding insert 2 has an upper tubular portion 3, a lower tubular portion 4 which is nested therein and has a thread 8 therein, and a rising tubular portion 6 inserted into the lower tubular portion 4 from below. A plate-shaped pedestal 5 having an insertion hole 7 formed in the lower part of the cylindrical wall of the rising cylindrical part 6. As a result, in the bottom plate portion 20 of the U-shaped block 1, a through-bolt hole having a thread is formed on the inner surface, and the plate-shaped pedestal 5 is buried under the hole. In addition, when pouring concrete into the formwork, in order to prevent the concrete from flowing into the insertion hole 7, the insertion hole is temporarily closed with an adhesive tape or the like. In the drawing, reference numeral 4a denotes an anchor protruding from the lower tubular portion 4 to resist the pulling force.
[0012]
The insert 2 is attached by fitting the upper tubular portion 3 to a set boss 9 attached to the formwork 22 with the bolt 10, the cushion material 15, and the nut 16. However, this is of course only an example, and it goes without saying that other mounting methods may be used.
[0013]
Since the upper tubular portion 3 and the lower tubular portion 4 of the insert 2 are nested as shown in FIG. 4 and the like, the entire length can be expanded and contracted, and the bottom plate portion having various thicknesses according to one type of standard. Can be used for
[0014]
After the U-shaped block 1 is produced in a factory, it is transported to the site, lifted by a crane or the like, lowered to a predetermined position, and installed. Then, the level adjustment bolt 11 is screwed from above the embedded insert 2 which is a through bolt hole. As shown in FIGS. 5 and 6, the level adjustment bolt 11 has a cavity 12 inside and a thread 14 formed on the outer periphery. The upper part is a hexagonal hole 13 (rotated with a hexagonal wrench) as a rotating mechanism, and the lower part is a circular cavity 14. Of course, all cavities may be hexagonal holes. When the level adjusting bolt 11 is further rotated with a hexagonal wrench, the lower end of the bolt contacts the rising cylindrical portion 6 of the pedestal 5 and pushes the pedestal 5 downward. Then, the U-shaped block 1 rises due to the reaction force of the ground work 25, and the level is adjusted by rotating the bolt 11 while measuring with a level measuring instrument or the like. Next, the injection port 24 of the hose 23 from the pumping device is connected to the through bolt hole, and a hardening material 26 such as mortar is injected. The hardening material 26 is filled from the cavity 12 of the level adjustment bolt 11 to the lower side of the bottom plate portion 20 of the U-shaped block 1 through the insertion hole 7 of the rising cylindrical portion 6 of the pedestal 5. The recess 21 above the through bolt hole is filled with mortar or the like and repaired.
[0015]
In the above process, the level adjustment bolt 11 may be screwed to the embedded insert 2 before the U-shaped block 1 is installed so that the pedestal 5 is not pushed down.
[0016]
The present invention is not limited to the U-shaped block, but can be applied to other concrete products such as the box culvert 30 and the L-shaped retaining wall 40 as shown in FIGS.
[0017]
【The invention's effect】
In the construction method of the present invention, the work of adjusting the level of the concrete product and fixing the concrete product with the hardening material is performed from above or inside the concrete product, and it is not necessary to perform the work from the side of the concrete product. It is safe and does not require any side work space and can significantly reduce excavation volume. In addition, since the level is adjusted by rotating the bolt, the concrete product is quickly fixed to the exact level, so when paving with concrete or asphalt around the concrete product, the top of the concrete product is used as a ruler, The pavement can be easily finished. Since the hardened material at the bottom of the concrete product is injected, the conventional mortar is not required and can be filled without gaps.
[0018]
In the concrete product of the present invention, a through bolt hole is formed in the bottom plate in advance, and a pedestal is also embedded. Therefore, the pedestal is automatically set only by screwing a level adjustment bolt on site, which is extremely convenient.
[0019]
Since the embedding insert of the present invention is combined with the upper cylindrical portion and the lower cylindrical portion forming the through bolt holes, and the pedestal, the concrete product of the present invention can be easily manufactured only by attaching this to the formwork.
[Brief description of the drawings]
FIG. 1 is a sectional view of a U-shaped block 1 of an embodiment.
FIG. 2 is a plan view of the U-shaped block 1. FIG.
FIG. 3 is a sectional view of a through bolt hole portion of a bottom plate portion 20 of the U-shaped block 1.
FIG. 4 is a partial cross-sectional view of the mold 22 of the U-shaped block 1 in a state where the embedded insert 2 is attached.
FIG. 5 is a side view showing a right half of the level adjustment bolt 11 in a longitudinal section.
FIG. 6 is a top view of the level adjustment bolt 11;
7 is a sectional view of the box culvert 30. FIG.
8 is a sectional view of the L-shaped retaining wall 40. FIG.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 U-shaped block 2 embedded insert 3 upper cylinder 4 lower cylinder 5 pedestal 6 rising cylinder 7 insertion hole 8 screw 9 set boss 10 set boss support bolt 11 level adjustment bolt 12 cavity 13 hexagonal hole 14 screw Article 15 Set boss cushion material 16 Set boss support nut 20 U-shaped block bottom plate 21 Recess 22 Formwork 23 Hose 24 Inlet 25 Land work 26 Hardened material 27 Iron leveling surface 30 Box culvert 40 L-shaped retaining wall

Claims (4)

A step of providing through bolt holes having threads on the inner surface at at least three places of a bottom plate portion of the concrete product; and a step of screwing a level adjusting bolt having a cavity therein and a rotating mechanism at an upper part in the through bolt holes. Installing the concrete product in a predetermined position, rotating the level adjusting bolt by an upper rotating mechanism to adjust the level, injecting a hardening material from a cavity in the level adjusting bolt and filling the back side of the concrete product Method for fixing a concrete product by fixing the concrete product A bottom plate portion of the concrete product is provided with a sleeve having a thread therethrough penetrating through the bottom plate portion, and a plate-shaped pedestal is buried under the lower portion so as to close the hole of the sleeve. Concrete products It is characterized by comprising a sleeve having a thread inside, and a plate-shaped pedestal having a rising cylindrical portion inserted into the sleeve from below and having an insertion hole formed in a lower portion of a cylindrical wall of the rising cylindrical portion. Embedded insert 4. The embedding insert according to claim 3, wherein the sleeve comprises an upper tubular portion and a lower tubular portion which is telescopically fitted therein and has a thread therein.

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