JPH0791858B2 - Concrete member with height adjustment mechanism and construction method of concrete member - Google Patents

Description

TECHNICAL FIELD The present invention relates to a concrete member with a height adjusting mechanism and a method of constructing a concrete member. More specifically, the construction can be done easily and reliably, and the construction period can be shortened.
The present invention relates to a concrete member with a height adjusting mechanism capable of cost reduction and a construction method for the concrete member.

[Prior Art] Conventionally, concrete box culverts, retaining wall blocks, U-shaped waterway blocks, L-shaped waterway blocks, road gutter blocks, and other concrete products manufactured in factories (hereinafter referred to as concrete members) Is
A concrete member with a certain length is hung on the foundation using a sequential truck crane, etc., and in the suspended state, it is moved in the front-rear direction to align the front and rear surfaces, and the foundation and the ground contact bottom of the concrete member. After intervening an intervening material to adjust the slope and height, concrete was poured between the installation bottom of the concrete member and the foundation to fix the concrete member on the foundation.

However, the above work requires a small number of workers to work in a deep digging hole, which is inferior in workability and may cause personal injury if teamwork is lacking.

In addition, it is difficult to inject the concrete so that it spreads throughout the member bottom slab portion, that is, the center of the bottom slab portion of the concrete member remains hollow, and if left in such a state, an unbalanced load will be applied to the concrete member. The accident was easy to occur when it happened.

In order to solve the above drawbacks, as shown in FIG. 6, a long nut (12) is embedded in a concrete member (11), and a female screw (13) is screwed into the long nut (12). By rotating the female screw (13), the laying surface and the concrete member (1
A concrete member with a height adjustment mechanism that can adjust the height with the bottom of 1) has been proposed (Jitsuko Sho 63-322).
No. 11 bulletin). According to the publication, the height of the concrete member with respect to the laying surface can be freely adjusted, and mortar or the like is injected from a through hole (not shown) into the gap between the laying surface and the bottom surface of the concrete member so that the mortar is hollow. It is stated that the parts disappear and the concrete member has perfect swirl and no rattling. It is also stated that the work efficiency can be remarkably improved because the height can be adjusted on site and the work can be performed safely.

[Problems to be Solved by the Invention] However, in the concrete member according to Japanese Utility Model Publication No. 63-32211, it is necessary to previously embed a long nut in the member at the manufacturing stage. Therefore, there are various problems as described below.

When installing concrete members, it is often prudent for foreign matter such as earth and sand, wood chips, and pebbles to enter the interior of the long nut. Therefore, the height of the concrete member cannot be adjusted.

Since the height adjusting long nut is embedded in the concrete member, it can no longer be taken out after the member has been put in place. for that reason,
There is a risk that rust and corrosion change will occur inside the concrete member from an early stage after the member is installed, and the member body will be destroyed.

It is necessary to place concrete with the long nut attached to the formwork from the beginning, and it is in the correct position for the weight and pressure of the concrete and for the vibration of the vibrator used to increase the product strength. It is very difficult to keep long nuts. In addition, it is difficult to check whether the long nut is installed correctly, and if the long nut is installed diagonally, an unbalanced load is applied to the concrete member, and in the worst case, the member is unbalanced. It is highly conceivable that the person will fall and cause a personal injury.

Since long nuts and fresh concrete do not easily adhere,
It becomes difficult to place concrete uniformly around the long nut, and the accuracy of the product can be kept uniform.

Since a special form must be used, the capital investment for that is large, and the cost of the product itself is also greatly increased.

Also, the hexagonal wrench (14) is inserted into the hexagonal recess formed in the head of the female screw to rotate the female screw, but if the long nut and the female screw do not mesh smoothly, it is a little larger. When force is applied, the corners of the female screw are worn away or chipped, and the adjustment mechanism cannot be repaired or replaced only by the embedded method, and subsequent height adjustment becomes impossible.
Further, even if only the long nut has a defect, the entire product becomes unusable and must be discarded.

Furthermore, the lower end of the female screw that protrudes from the long nut is in direct contact with the laying surface, so to speak, it is close to a point contact, so if the laying surface is soft, the lower end of the female screw will sink. Height adjustment becomes impossible. Moreover, only the height direction can be adjusted, and the front, rear, left, and right cannot be adjusted.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a concrete member and a construction method thereof, in which the drawbacks of the above-mentioned prior art are eliminated. That is, the object of the present invention is to
A concrete member with a height adjusting mechanism that is easy to manufacture, can surely adjust the height, and is low cost, and a concrete whose position can be adjusted not only in the height direction but also in the front, back, left and right by using the member. It is intended to provide a construction method for members.

[Means for Solving the Problem] In the concrete member with a height adjusting mechanism of the present invention, holes for inserting bolts are formed at appropriate positions in the bottom slab, and washers and nuts are provided on the upper surface and the lower surface of the holes. It is fixed concentrically with the hole in this order, bolts are screwed into both nuts, and a through hole for injecting a filler is formed at an appropriate position of the bottom plate portion. The feature is that the height of the laying surface and the bottom surface of the concrete member can be adjusted by rotation. Further, the method for constructing a concrete member of the present invention is such that the concrete member is lowered onto the laying surface so that the lower end of the bolt is located on the liner plate placed on the laying surface, and the concrete member is slid back and forth and right and left. The position of the concrete member is adjusted, the height of the concrete member is adjusted by rotating the bolt, and the filling material is injected through a through hole formed at an appropriate position of the bottom slab portion of the concrete member.

[Example] Next, a concrete member of the present invention and a construction method thereof will be described with reference to the drawings.

FIG. 1 is a sectional explanatory view of an embodiment of a concrete member with a height adjusting mechanism of the present invention, and FIG. 2 is an enlarged sectional explanatory view of a height adjusting mechanism.

In FIG. 1, (1) is a concrete member, and holes (2) for inserting bolts are formed at appropriate positions (preferably a plurality of positions including four corners of the bottom plate part) of the bottom plate part (1a) of the member (1). ) (Not shown in FIG. 1; see FIG. 2) are formed. The holes (2) may be uniformly formed in the factory, or in some cases, may be formed in the field by a drill or the like depending on the situation. The size of the hole (2) is preferably slightly larger than the outer diameter of the bolt described later.

A washer (3) and a nut (4) are fixed to the upper surface and the lower surface of the bolt insertion hole (2) in this order. The fixing may be performed using an adhesive or the like, and the method is not particularly limited in the present invention. Also,
This fixing may be performed in the factory after manufacturing the concrete member, or may be performed on site. If it sticks on site, be sure to prevent foreign matter such as sand or pebbles from entering the nut (4) during transportation or when installing the member (1) and the bolt will not engage with the nut (4). You can Moreover, since the nut (4) can be attached to the concrete member (1) after confirming the engagement between the bolt and the nut, the height can be surely adjusted, and the height adjusting member is not defective. It can prevent the occurrence. The washer (3) and the nut (4) are fixed to the concrete member (1) so as to be concentric with the hole (2).

A bolt (5) that meshes with the nut (4) is screwed onto the nut (4). The height of the concrete member (1) is adjusted by rotating the bolt (5). Bolt (5)
Can be removed after fixing the concrete member.
This makes it possible to prevent rust and corrosion change from occurring in the member.

A through hole (6) for injecting a filler (7) such as mortar is formed at an appropriate position of the bottom slab (1a) of the concrete member (1). After arranging the concrete member (1) at a desired location and adjusting the height and the like, the filler (7) is injected from the through hole (6) to fix the concrete member (1).

When injecting the filler (7), the concrete member (1)
It is necessary to prevent the filler (7) from flowing out by closing the front and rear gaps with a mold or slightly hard concrete.

Below the lower end of the bolt (5), a liner plate (8) made of an iron plate or a stainless plate is provided. The concrete member (1) is placed on the laying surface so that the lower end of the bolt (5) is on the liner plate (8). The lower end of the bolt (5) can slide well on the plate (8), which facilitates the front-rear and left-right alignment of the concrete member (1). After the front-rear and left-right positions are aligned, the height of the member is adjusted by rotating the bolt (5).

In FIGS. 1 to 5, (20) represents basic concrete, (21) basic rubble stone, and (22) basic ground. The types and thicknesses of the basic concrete (20) and the foundation stone (21) may be appropriately selected according to the type of concrete member and the condition of the foundation.

FIGS. 3 to 5 show another embodiment of the concrete member with a height adjusting mechanism of the present invention. FIG. 3 is a box culvert, FIG. 4 is a road gutter block, and FIG. It represents a waterway.

[Effects of the Invention] As described above, according to the present invention, the following effects can be achieved.

Height adjustment mechanism (bolts,
(Nuts and washers) can be attached, and there is no need to use a special formwork, which simplifies the manufacturing facility.

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

The nut can be fixed when installing concrete members on site, and foreign matter such as sand and pebbles can be prevented from entering the nut and obstructing the engagement with the bolt, and the height can be adjusted reliably. be able to.

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

When manufacturing in a factory, the structure is extremely simple, so high-precision products can be mass-produced and supplied quickly.

Since the equipment used can be obtained at an extremely low cost, the manufacturing unit price can be kept low.

Since the lower end of the bolt slides on the liner plate, the front, rear, left and right positioning can be performed very easily.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view of an example of a concrete member with a height adjusting mechanism of the present invention, FIG. 2 is an enlarged sectional explanatory view of a height adjusting mechanism, and FIGS. 3 to 5 are height adjusting mechanisms of the present invention. FIG. 6 is a cross-sectional explanatory view of another embodiment of the concrete member with a height adjusting mechanism, and FIG. 6 is a cross-sectional explanatory view of a height adjusting mechanism portion of a conventional concrete member with a height adjusting mechanism. (Main symbols in the drawing) (1): Concrete member (2): Bolt insertion hole (3): Washer (4): Nut (5): Bolt (6): Through hole

Claims (3)

[Claims] 1. A hole for inserting a bolt is formed at an appropriate position of the bottom plate portion, and washers and nuts are fixed to the upper surface and the lower surface of the hole in this order and concentrically with the hole. A bolt is screwed in and a through hole for injecting a filler is formed at an appropriate position of the bottom slab, and the height of the laying surface and the bottom surface of the concrete member can be adjusted by rotating the bolt. A concrete member with a height adjustment mechanism characterized by the following. 2. A concrete member comprising holes for inserting bolts formed at appropriate positions on the bottom slab, and washers and nuts fixed to the upper surface and the lower surface of the holes in this order concentrically with the holes. Screw the bolt down into the hole, lower the concrete member onto the laying surface so that the lower end of the bolt is located on the tiny plate placed on the laying surface, and slide the concrete member back and forth and left and right. Perform the alignment, adjust the height of the concrete member by rotating the bolt, and then fix the concrete member by injecting the filler from the through hole formed at the appropriate position of the bottom slab of the concrete member. Construction method for concrete members. 3. A washer and a nut are fixed to the upper surface and the lower surface of the concrete member, in which holes for inserting bolts are formed at appropriate positions on the bottom slab, concentrically with the holes in this order. Screw the bolt down onto the laying surface, lower the concrete member onto the laying surface so that the lower end of the bolt is located on the liner plate placed on the laying surface, and slide the concrete member forward, backward, left, and right to align. And adjusting the height of the concrete member by rotating the bolt, and then fixing the concrete member by injecting a filler from a through hole formed at an appropriate position of the bottom slab of the concrete member. Construction method for concrete members.