JPH09221769A - Elevation adjuster and concrete secondary product with adjuster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify how to mount even a concrete secondary product which is thick and large by inserting a bolt whose tip is worked so as to shape up basically a sphere surface into a basically truncated cone-shaped cotter and engaging a universal adjuster with an inner screw with a male screw area of the bolt. SOLUTION: A male screw area 4 is threaded between the head 1 of a bolt 5 and the end of the bolt 5 where the tip 2 of the end 3 is worked substantially like a sphere surface. This bolt 5 is inserted into a cotter 6 with a through hole which is shaped up basically like a truncated cone. An universal adjuster 8 with an inner screw is engaged with the male screw area 4 of the bolt 5, thereby forming an elevation adjuster A. When it is used, the bolt 5 is inserted into a hole in a base plate of a concrete secondary product, thereby fitting the end of the cotter 6 on the side of a smaller outside diameter and engaging the universal adjuster 8 with the bolt 5 from the bottom side. It is, therefore, possible to inhibit the deviation of a central position between the bolt 5 and the hole and inhibit the slanting of their mutual central shafts only by dropping the cotter 6 into the hole of the concrete secondary product with self-weight and fitting them thereinto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a height adjusting fitting for laying a concrete secondary product and a concrete secondary product with a height adjusting fitting. More specifically, it is particularly easy to attach the concrete secondary product, and it is possible to lay the concrete secondary product accurately and easily, and it is possible to shorten the construction period and reduce the cost. The present invention relates to a height adjusting metal fitting for laying a concrete secondary product and a concrete secondary product with a height adjusting metal fitting.

[0002]

2. Description of the Related Art Conventionally, concrete secondary products manufactured in factories such as concrete box culverts, retaining wall blocks, U-shaped waterway blocks, L-shaped waterway blocks, road gutter blocks, etc. A concrete secondary product with a length is sequentially hung on the laying surface using a truck crane, etc., and in the suspended state, it is moved in the front-rear direction to align the front and rear surfaces. After interposing an inclusion between the bottom surface and the slope or height adjustment, a filler such as mortar is injected between the laying surface and the bottom surface of the concrete secondary product to lay the concrete secondary product on the laying surface. It was fixed on top.

However, in the above-mentioned work, there are many cases where a few workers handle a heavy object in a narrow and deep pit, and the workability is poor.

Further, since it is not possible to secure a sufficient space between the laying surface and the bottom surface of the concrete secondary product, it is difficult to inject the filler so as to spread over the entire bottom surface of the concrete secondary product. As a result, the vicinity of the central portion of the bottom surface of the secondary concrete product remained hollow, and when left in such a state, an unbalanced load was likely to act on the secondary concrete product.

As a solution to the above drawbacks,
As disclosed in 63-32211, a long nut is embedded in a concrete secondary product, a female screw is screwed into the long nut, and the gap between the laying surface and the bottom face of the concrete secondary product is rotated by rotating the female screw. There is a concrete secondary product with a height adjustment mechanism that can adjust However, in the concrete secondary product, various problems occur due to the need to bury long nuts in advance at the manufacturing stage in the factory. For example, there is a possibility that foreign matter such as earth and sand, wood chips, and pebbles will mix inside the long nut during the installation and installation of secondary concrete products.If such foreign matter mixes, the long nut and female screw will not mesh with each other. It becomes a defect, and as a result, it becomes difficult to adjust the height of the secondary concrete product.

In order to solve such a problem, the applicant of the present invention has previously proposed a height adjusting fitting shown in Japanese Patent Laid-Open No. 2-104829. As shown in FIG. 8, the height-adjusting metal fitting has an end on the side opposite to the head processed into a substantially spherical shape, and is inserted into a hole 32 formed in the bottom slab 31a of the secondary concrete product. A bolt 36, a nut 34 that is screwed into the bolt 36, a washer 33 that is inserted into the bolt 36, and a substantially plate-shaped adjustable metal fitting 37 having a female screw portion that is screwed into the male screw portion of the bolt 36. In use, the washer 33 and the nut 34 are fixed in this order to the upper surface of the hole 32 of the bottom slab 31a concentrically with the hole 32, and the adjustable metal fitting 37 is provided on the lower surface of the hole 32. It is characterized in that it is screwed into the bolt 36.

Further, the concrete secondary product 31 using such a height adjusting fitting has a bottom slab 3 as shown in FIG.
A hole 32 for inserting a bolt is formed at an appropriate position of 1a, and a washer 33 and a nut 34 are fixed on the upper surface side of the hole 32 concentrically with the hole 32 in this order.
A substantially plate-shaped universal adjustment metal fitting 37 having a female screw portion is provided on the lower surface side of 2, and a bolt 36 having a lower end processed into a substantially spherical shape is screwed into the nut 34 and the universal adjustment metal fitting 37. And a through hole 20 for injecting a filler is formed at an appropriate position of the bottom slab portion 31a, and the top surface of the foundation concrete 22 which is a laying surface and the bottom slab portion of the concrete secondary product 31 are formed by the rotation of the bolt 36. The feature is that the distance from the bottom surface of 31a can be adjusted.

To use such a height adjusting fitting, the hole 3
The adjustable secondary metal fitting 37 is screwed onto the lower end portion of the bolt 36 protruding from the lower surface side of 2, and in this state the concrete secondary product 31 is placed on the base concrete 22 at a predetermined laying surface position. At this time, it is preferable to provide a liner plate 25 made of an iron plate or a stainless steel plate on the basic concrete 22 located below the lower end of the bolt 36. In the concrete secondary product 31, the lower end of the bolt 36 is the liner plate. It is placed so as to come on the plate 25. The lower end of the bolt 36 is processed into a substantially spherical shape as described above, and can be slid on the liner plate 25 satisfactorily, so that the concrete secondary product 31 can be easily aligned with the front, rear, left and right with a small force. It After the front, rear, left, and right positions are aligned, the height of the member is adjusted by rotating the bolt 36.

Finally, the space 21 secured between the upper surface of the foundation concrete 22 which is the laying surface and the bottom surface of the bottom slab 31a is filled with the filler injected from the through hole 20 to make a series of The work is completed.

In this way, the previously proposed height adjusting metal fittings and concrete secondary products with height adjusting metal fittings have the following effects that have not been obtained conventionally.

After the secondary concrete product is manufactured, the height adjusting metal fittings (bolts, nuts, washers, and universal adjusting metal fittings) can be attached, and since it is not necessary to use a special formwork, the manufacturing facility can be simplified.

Since it can be attached to the member after confirming the meshing, it is possible to prevent the occurrence of a member having a defect in the height adjusting portion.

When installing a concrete secondary product on site, it is possible to fix a nut and a free adjustment metal fitting, and foreign matter such as sand and pebbles intrudes into the nut to prevent the engagement with the bolt. It is possible to prevent and surely adjust the height.

Since the bolts and the like can be removed after the members are installed, the quality of the concrete secondary product can be kept in good condition for many years without causing rust or corrosion in the concrete secondary product. .

When manufacturing in a factory, since the structure is extremely simple, it is possible to mass-produce and supply highly accurate products quickly.

Since the equipment to be used is available at a very low cost, the manufacturing unit price can be kept low.

Since the lower end portion of the bolt is processed into a substantially spherical shape so that it can slide on the liner plate extremely smoothly, it can be easily and with a small force, and is extremely highly precise in comparison with the conventional embedded type. Can be aligned.

If the adjustable metal fitting is a hat-shaped metal fitting,
Since the lower end (the portion in contact with the liner plate) can be processed into a rounded pipe cross section to reduce the friction coefficient, the front, rear, left, and right can be aligned even without the bolts.

When a protrusion is provided on the surface of the plate-like portion of the adjustable metal fitting facing the washer, the metal fitting is firmly fixed to the concrete secondary product by crimping, so the metal fitting is attached to the concrete secondary product. The height can be adjusted immediately after that, and the construction period can be greatly shortened.

[0020]

However, when using the height adjusting metal fitting disclosed in the above-mentioned Japanese Patent Laid-Open No. 2-104829, the bottom slab portion of the concrete secondary product is laid before laying the concrete secondary product. It is necessary to previously secure a washer and a nut to the upper surface of the formed hole in this order concentrically with the hole with an adhesive or the like. At this time, if the displacement of the center position of the washer, the nut or bolt and the hole and the inclination of the center axes are larger than the allowable value, the bolt is straightened to the center of the hole while being screwed with the nut. Can not be inserted into. As a result, if the adjustable metal fitting screwed on the side opposite to the head of the bolt is sandwiched between the laying surface by the weight of the concrete secondary product and adhered and fixed to the lower surface of the concrete secondary product. In the meantime, smooth movement of the bolt at the two threaded parts between the nut and the adjustable metal fitting and the bolt is obstructed, and the eccentric force generated during the rotation of the bolt causes the washer and the nut to come off. There is. Furthermore, if the center position of the bolt and the hole are misaligned and the inclination of the center axes is extremely large, the bolt may come into contact with the wall surface in the middle of the hole, making it difficult for the bolt to completely penetrate the hole. Such a situation occurs.

Such a problem is caused when the thickness of the bottom slab becomes large and long bolts must be used.
Especially noticeable.

In view of the above circumstances, it is an object of the present invention to provide a height adjusting metal fitting and a concrete secondary product with the height adjusting metal fitting, in which the drawbacks of the prior art are solved. That is, the object of the present invention is that the secondary concrete product with a large thickness can be easily attached and easily manufactured, and the height of the secondary concrete product can be reliably adjusted with a small force when laying. An object of the present invention is to provide a height-adjusting metal fitting capable of surely removing bolts after installation and a concrete secondary product with the height-adjusting metal fitting using the same.

[0023]

The height adjusting metal fitting of the present invention is a metal fitting used for height adjustment of a concrete secondary product, comprising: (a) a head and a tip opposite to the head. A bolt having an externally threaded portion engraved between it and an end processed into a substantially spherical shape, (b) a cotter with a through-hole having a substantially truncated cone shape that is inserted into the bolt, and (c) the bolt. It consists of a freely adjustable metal fitting with an internal thread having a female thread section to be screwed with a male thread section.In use, after inserting the cotter into the head side of the bolt, the bolt is attached to the bottom slab of the concrete secondary product. Inserted into the formed hole, the end of the cotter having a smaller outer diameter is fitted to the upper surface side of the hole of the bottom slab and is fixed concentrically with the hole, and the universal adjustment metal fitting is the hole. It is provided on the lower surface side of and is screwed to the bolt.

Also, (a) a bolt having a male thread portion formed between the head portion and an end portion on the opposite side of the head portion, the tip of which is processed into a substantially spherical shape, and (b) the bolt. The cotter with an inner screw having a substantially truncated cone shape that is screwed to the male screw part of (c), and (c) the adjustable screw metal fitting with an inner screw that has a female screw part that is screwed with the male screw part of the bolt. After screwing the cotter on the head side of the bolt, the bolt is inserted into a hole formed in the bottom slab of the concrete secondary product, and the end of the cotter having a smaller outer diameter is the bottom slab. Is fitted to the upper surface side of the hole and fixed concentrically with the hole, and the adjustable metal fitting is provided on the lower surface side of the hole and screwed to the bolt.

Further, in the concrete secondary product with height adjusting fitting of the present invention, holes for inserting bolts are formed at appropriate positions in the bottom slab, and through holes of substantially frustoconical shape are formed on the upper surface side of the holes. The smaller outer diameter end of the attached cotter is fitted, and a free adjustment metal fitting with an internal thread having a female thread portion is provided on the lower surface side of the hole, and the cotter is inserted through the universal adjustment metal fitting. Bolts are screwed together, and a through hole for injecting a filler is formed at an appropriate position of the bottom plate portion,
It is characterized in that the distance between the laying surface and the bottom surface of the secondary concrete product can be adjusted by rotating the bolt.

Further, a hole for inserting a bolt is formed at an appropriate position of the bottom slab, and the end of the cotter with an inner screw having a generally frustoconical shape having a smaller outer diameter is fitted to the upper surface side of the hole. A freely adjustable metal fitting with an internal thread having a female thread portion is provided on the lower surface side of the hole, a bolt for screwing the cotter is screwed to the universal adjustment metal fitting, and the bottom plate portion is provided. A through hole for injecting the filler is formed at an appropriate position of
It is characterized in that the distance between the laying surface and the bottom surface of the secondary concrete product can be adjusted by rotating the bolt.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION A height adjusting fitting and a concrete secondary product with a height adjusting fitting using the same according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view showing an embodiment of the height adjusting metal fitting of the present invention, FIG. 2 is a perspective view showing a cotter with a through hole in FIG. 1, and FIG. 3 is a freely adjusting metal fitting with an internal screw in FIG. Hereinafter, referred to as a universal adjustable metal fitting), FIG. 4 is a perspective view showing another embodiment of the universal adjustable metal fitting, FIG. 5 is a sectional view showing a concrete secondary product with a height adjustable metal fitting, and FIG. 6 is the present invention. FIG. 7 is a front view showing another embodiment of the height adjusting fitting of FIG. 7, and FIG. 7 is a perspective view showing a cotter with an internal screw in FIG.

As shown in FIGS. 1 to 3, a height adjusting fitting A of the present invention comprises a head portion 1 and an end portion 3 on the opposite side of the head portion 1 whose tip 2 is processed into a substantially spherical shape. A bolt 5 having a male thread portion 4 engraved between them, a cotter 6 with a through-hole having a substantially truncated cone shape inserted into the bolt 5, and a male thread portion 4 of the bolt 5.
And a free-adjusting metal fitting 8 having a female screw portion 7 that is screwed together.

The head portion 1 is formed with a hexagonal turning portion 1a for facilitating the rotation of the bolt 5, and the outer diameter of the end portion 3 is larger than that of the male screw portion 4. The size is made smaller so that the adjustable metal fitting 8 can be easily screwed into the male screw portion 4.

The cotter 6 has a through hole 6b and is composed of an end portion 6a having a small outer diameter and an end portion 6c having a large outer diameter. The adjustable metal fitting 8 has a cylindrical portion 8a fitted into the hole 32 of the secondary concrete product 31 shown in FIG. 5 and a flange portion 8b in contact with the lower surface of the bottom slab portion 31a.
And the four protrusions 8c are provided on the front surface side of the flange portion 8b which is in contact with the lower surface of the bottom plate portion 31a.
Due to the cylindrical portion 8a, the bolt 5 is, as described later,
It is supported and prevents wobbling. The projection 8c is provided on the bottom plate portion 31 by the weight of the concrete secondary product 31 when the concrete secondary product 31 is placed on the laying surface.
It is designed so that when the bolt 5 is rotated, it is securely screwed into the free adjustment metal fitting 8. Although four protrusions are provided in the present embodiment, the present invention is not limited to this, and at least one protrusion may be provided. Further, the shape of the projection is not limited to the conical shape as in this embodiment, and for example, as shown in FIG. 4, a corner shape C of the universal adjustment metal fitting 18 is bent to the lower surface side of the bottom plate portion to form a triangular shape. It may be formed on the protrusion 18c.

The assembly structure of the height adjusting fitting is as follows.
As shown in FIG. 5, the smaller outer diameter end portion 6a of the cotter 6 is fitted to the upper surface side of the bolt insertion hole 32 provided in the bottom slab portion 31a of the concrete secondary product 31, and The bolt 5 is inserted from the end 6c having the larger outer diameter of the cotter 6 through a through hole 6b provided in the cotter 6. Further, a free adjustment metal fitting 8 having a female screw portion 7 is arranged on the lower surface side of the hole 32, and a bolt 5 is screwed into the free adjustment metal fitting 8.

Next, the work for laying the height adjusting fitting A will be described. As shown in FIGS. 1 and 5, first, before the height adjusting fitting A is installed on the bottom plate portion 31 a, the universal adjusting fitting 8 is removed and the cotter 6 is inserted into the bolt 5. Next, the bolt 5 is inserted into the upper surface side of the hole 2 provided in the bottom plate portion 31a from the end portion 3 thereof, and the end portion 6a having the smaller outer diameter of the cotter 6 is fitted into the hole 32 by its own weight. Then, the height adjusting fitting A is positioned and fixed. Not only can the central axis of the bolt 5 be substantially aligned with the central axis of the hole 32 by such a simple operation, the cotter 6 can be fitted in the hole 32 in a wedge shape, and further, in the direction in which the fitting is tightened, the entire cotter 6 can be fitted. Because its own weight is acting,
Even if the cotter 6 is not fixed to the hole 32 with an adhesive,
It is possible to secure the degree of fixation required for smooth subsequent work.

Further, the cotter 6 and the hole 3 of the bottom plate portion 31a.
2 is not completely fixed and is slidable, and the cotter 6 and the bolt 5 have more allowance for relative movement between the nut and the bolt than in the conventional case. So, even if the bottom slab 31 of the concrete secondary product 31
Even when the parallelism of the upper and lower surfaces of a and the perpendicularity of the hole 32 with respect to these are not sufficiently ensured, the cotter 6 and the bolt 5 are properly positioned with respect to the hole 32 in the process of inserting the bolt 5. Is automatically adjusted,
The bolt cannot be penetrated into the hole as in the past,
Alternatively, it is possible to prevent the occurrence of an inconvenient situation such as an excessive eccentric force being applied.

In the above-mentioned work procedure, the cotter 6 was inserted into the bolt 5 immediately before the height adjusting metal fitting A was installed on the bottom plate portion 31a. However, in the processing stage, the male screw portion 4 is attached to the lower end portion of the bolt 5 in advance. Before the cutting, the cotter 6 is inserted into the bolt 5, and then the male screw portion 4 is cut at the lower end of the bolt 5, and the outer diameter of the male screw portion 4 is changed to the diameter of the through hole 6b of the cotter 6. It is preferable to make it larger so that the cotter 6 does not come out of the bolt 5. That is, by integrating the bolt 5 and the cotter 6 at the processing stage, it is possible to simplify the work of managing the number of parts on site and eliminate the complexity of mounting the cotter 6 on the bolt 5. You can also do it. Moreover, even in the work of inserting the bolt 5 downward from the upper surface side of the hole 32 of the bottom slab 31a and installing it in the hole 32, the cotter 6 does not fall out from the bolt 5, and the work at the site to prevent the cotter 6 from coming off. The workability is good because the care and labor required by the operator are completely unnecessary. This is particularly important for laying work in narrow and deep trenches where the working environment is poor.

Then, the cylindrical portion 8a is fitted into the hole 32 while the free adjusting metal fitting 5 is screwed onto the male screw portion 4 on the end portion 3 side of the bolt 5 protruding from the lower surface side of the hole 32. In this state, the concrete secondary product 31 is added to the foundation concrete 22.
Place it on the specified laying surface. At this time, it is preferable to provide a liner plate 25 made of an iron plate or a stainless plate on the basic concrete 22 located below the end portion 3 of the bolt 5, and the concrete secondary product 31
Is placed so that the end 3 of the bolt 5 is on the liner plate 25. The tip 2 of the bolt 5 is processed into a substantially spherical shape as described above, and the liner plate 25
The upper part can be slid well, which makes it possible to easily position the secondary concrete product 31 in the front, rear, left and right with a small force. By forming a self-lubricating material such as a fluororesin on the liner plate 25, the frictional resistance is further reduced. The height of the concrete secondary product 31 is adjusted by rotating the bolt 5 after the front, rear, left, and right positions are aligned. In this case, the head 1 side of the bolt 5 is also a truncated cone-shaped cotter. 6, the cotter 6 and the bolt 5 have a relatively large degree of freedom with respect to the hole 32, and at the end 3 side of the bolt 5, the cylindrical portion 8a of the adjustable metal fitting 5 has the hole 3
Since it is supported inside 2, the bolt 5 rotates smoothly, and an excessive eccentric force does not act. Then, finally, in the space 21 secured between the upper surface of the foundation concrete 22 serving as the laying surface and the bottom surface of the bottom slab 31a,
A series of operations are completed by filling a filler such as mortar injected through the through holes 20.

Next, after the filling work is completed, the bolt 5 is rotated and pulled out. At this time, since the male thread portion is not formed in the end portion 3 of the bolt 5, the filling material does not clog the male thread portion and the bolt does not stop rotating, and the bolt 5 is reliably rotated and pulled out. be able to.

In FIG. 5, reference numeral 23 is a basic stone
Reference numeral 24 represents the foundation ground. Foundation concrete 22
The type and thickness of the foundation stones 23 may be appropriately selected according to the type of the secondary concrete product 1 and the situation of the foundation.

Next, another embodiment of the height adjusting fitting of the present invention will be described. As shown in FIGS. 6 to 7, the height adjusting metal fitting B of this embodiment is different from the height adjusting metal fitting A in that the male screw portion 14 engraved between the head portion 11 and the end portion 13 is long. And the cotter is an internally-screwed cotter 16 having a female screw portion 17 that is screwed into the male screw portion 14. In this embodiment, when the height adjusting metal fitting B is laid, the cotter 16 is screwed in advance to the male screw portion 14 on the head 11 side so that the bolt 15 can be installed in the hole of the concrete secondary product. It can be performed more easily than the height adjustment fitting A.

The bolt may be left inserted in the concrete secondary product without being pulled out. In this case, the bolt functions as a kind of anchor bolt so that the concrete secondary product can be more firmly fixed at a predetermined position. Can be fixed.

The present invention is applicable to all concrete secondary products such as box culverts, gutter blocks for roads, large waterways, etc. in addition to the retaining wall blocks of concrete secondary products shown as examples. Various improvements and changes are conceivable within the scope of the gist.

[0042]

As described above, according to the height adjusting fitting and the concrete secondary product with the height adjusting fitting of the present invention, the following effects can be obtained.

By just dropping the cotter into the hole of the concrete secondary product by its own weight and fitting it, the deviation of the center position between the bolt and the hole and the inclination of the center axes can be suppressed to be small, and the proper fixing degree can be obtained. Therefore, the installation work is easy.

Even when the parallelism of the upper and lower surfaces of the bottom slab of the secondary concrete product and the perpendicularity of the holes to these are not sufficiently ensured, the cotter and the bolt can be freely positioned with respect to the holes. Since the height is high, the positions of the cotter and the bolt with respect to the hole are properly adjusted when inserting and tightening the bolt, so it is impossible to completely penetrate the bolt into the hole as in the past, or excessive eccentric force is generated when tightening the bolt. It is possible to prevent the occurrence of situations such as acting.

Further, in the processing stage, if the cotter is integrated with the bolt or the cotter and the bolt are screwed in advance so that the cotter does not fall out, the number of parts can be reduced on site. In addition to simplifying the work of managing the bolts, the complexity of having to attach a cotter to the bolts can be eliminated.In addition, insert the bolts downward from the top side of the holes in the bottom slab and install them in the holes. Since the cotter does not fall off from the bolt during work, the workability required to prevent the cotter from falling off is completely eliminated, and good workability can be obtained.

Further, since the male thread portion is not engraved at the end portion of the bolt, the bolt can be easily rotated and pulled out even after the laying work and the filler is solidified around the end portion. .

Further, since the cylindrical portion of the adjustable metal fitting is fitted into the hole of the concrete secondary product and supports the lower portion of the bolt, the front and rear and left and right of the concrete secondary product in the laying work can be aligned. Also, the wobbling of the bolt is prevented. As a result, the height of the concrete secondary product can be reliably adjusted by the rotation of the bolt.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a height adjusting fitting of the present invention.

FIG. 2 is a perspective view showing a cotter with a through hole in FIG.

FIG. 3 is a perspective view showing a freely adjustable metal fitting with an internal screw in FIG. 1.

FIG. 4 is a perspective view showing another embodiment of the adjustable metal fitting.

FIG. 5 is a cross-sectional view showing a concrete secondary product with a height adjusting fitting.

FIG. 6 is a front view showing another embodiment of the height adjusting fitting of the present invention.

7 is a perspective view showing a cotter with an internal screw in FIG.

FIG. 8 is a cross-sectional view showing a conventional height adjustment fitting.

FIG. 9 is a cross-sectional view showing a conventional concrete secondary product with a height adjusting fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Head part 2 Tip 3, 13 End part 4, 14 Male screw part 5, 15 Bolt 6 Cotter with through hole 6a, 6c End part 6b Through hole 7, 17 Female screw part 8 Adjustable metal fitting with internal screw 8a Cylindrical part 8b Flange 8c Protrusion 16 Inner threaded cotter 31 Concrete secondary product 31a Bottom slab 32 Holes A, B Height adjustment bracket

Claims (8)

[Claims] 1. A metal fitting used for height adjustment of a secondary concrete product, comprising: (a) a head and an opposite side of the head.
A bolt having a male screw portion engraved between the end and the end portion processed into a substantially spherical shape, (b) a cotter with a substantially truncated cone-shaped through hole that is inserted into the bolt, and (c) the bolt It consists of a freely adjustable metal fitting with an internal screw having a female screw part to be screwed with the male screw part of, and when the cotter is inserted into the head side of the bolt during use, the bolt is applied to the bottom plate part of the concrete secondary product. Is inserted into the hole formed in, the end of the cotter having the smaller outer diameter is fitted to the upper surface side of the hole of the bottom plate portion and fixed concentrically with the hole, and the universal adjustment metal fitting is A height adjusting fitting provided on the lower surface side of the hole and screwed into the bolt. 2. A metal fitting used for height adjustment of a secondary concrete product, comprising: (a) a head and an opposite side of the head.
A bolt having a male screw portion engraved between the end and the end portion processed into a substantially spherical shape, and (b) a cotter with an inner screw having a substantially truncated cone shape screwed into the male screw portion of the bolt, c) It is composed of a freely adjustable metal fitting with an internal thread having a female thread portion to be screwed with the male thread portion of the bolt, and in use, after the cotter is screwed to the head side of the bolt, the bolt is fixed to the concrete Insert into the hole formed in the bottom plate of the next product,
The end of the cotter having a smaller outer diameter is fitted to the upper surface side of the hole of the bottom plate portion and fixed concentrically with the hole, and the adjustable metal fitting is provided on the lower surface side of the hole. A height adjustment fitting characterized by being screwed onto a bolt. 3. The height adjusting metal fitting according to claim 1, wherein the adjustable metal fitting comprises a cylindrical portion fitted into the hole and a flange portion in contact with a lower surface of the bottom slab portion. 4. The height adjusting fitting according to claim 3, wherein at least one protrusion is provided on the front surface side of the flange portion that contacts the lower surface of the bottom plate portion. 5. A hole for inserting a bolt is formed at an appropriate position of the bottom plate portion, and an end of the cotter with a through hole having a substantially truncated cone shape having a smaller outer diameter is fitted to the upper surface side of the hole. Has been done,
A freely adjustable metal fitting with an internal thread having a female thread portion is provided on the lower surface side of the hole, a bolt for inserting the cotter is screwed into the freely adjustable metal fitting, and at an appropriate position of the bottom plate portion. A concrete secondary product with a height adjusting fitting, wherein a through hole for injecting a filler is formed, and a distance between a laying surface and a bottom surface of the concrete secondary product can be adjusted by rotating the bolt. 6. A hole for inserting a bolt is formed at an appropriate position of the bottom slab, and the end of the cotter with a generally frustoconical inner screw having a smaller outer diameter is fitted to the upper surface side of the hole. Has been done,
An inner threaded adjustable metal fitting having a female thread portion is provided on the lower surface side of the hole, a bolt for screwing the cotter is screwed into the universal adjustable metal fitting, and an appropriate position of the bottom plate portion. A through hole for injecting a filler is formed in, and the space between the laying surface and the bottom surface of the concrete secondary product can be adjusted by rotating the bolt, and the concrete secondary product with a height adjusting fitting is characterized. 7. The concrete secondary product with a height adjusting fitting according to claim 5, wherein the universal adjusting fitting comprises a cylindrical portion fitted into the hole and a flange portion in contact with a lower surface of the bottom slab portion. 8. The secondary concrete product with a height adjusting fitting according to claim 7, wherein at least one protrusion is provided on the front surface side of the flange portion which is in contact with the lower surface of the bottom slab portion.