JPH0882102A - Fixture of safety fence post installed in construction of reinforced concrete structure - Google Patents

Abstract

PURPOSE: To protect peripheral concrete from being contaminated and damaged by fixing temporarily an insertion pipe fixture with reinforcements, threading the insertion pipe with the fixture and applying a large rotary power to the insertion pipe in the extracting direction and canceling the bonding between the outer peripheral surface and the concrete. CONSTITUTION: A female screw threaded with a male screw of the lower end of an insertion pipe is installed to the inner peripheral surface of a peripheral wall 5a of a bottomed short cylindrical body 5. A pair of temporary fixing plates 7 are welded with a base plate 5b. A nut 8 is fixedly mounted to the bottom side of the central part of the base plate 5b where a fixing bolt 9 is threaded with the nut 8. The paired temporary fixing plates 7 are fixedly mounted to the shaft center of the bottomed short cylindrical body 5 at its symmetrical position. A nut 11, which is designed to be definitely pressed on the top of reinforcements R, is welded with the tip of the fixing bolt 9. When a safety fence is to be removed, a large revolving force is instantaneously added to the insertion pipe in the extraction direction. If the insertion pipe is slightly rotated, the close contact between the outer peripheral surface and the concrete is canceled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a post for a safety fence in which almost the lower half of the structure is embedded in concrete that is placed on the floor of a reinforced concrete structure and is provided at the periphery of the structure during construction. The present invention relates to a fixture for fixing the.

[0002]

2. Description of the Related Art In the construction of a reinforced concrete structure, an opening may be temporarily provided in a portion to be a floor during the construction. For example, FIG. 11 and FIG.
As shown in FIG. 2, an opening A is temporarily provided in a portion of the floor F where the elevator apparatus is constructed, and a beam B is provided in a portion of the floor F facing the opening A. Such an opening A is always provided during the construction of this type of structure. Therefore, since it is extremely dangerous if the opening A is provided in connection with the floor F, a safety fence S is provided around the opening A. Note that, in FIGS. 11 and 12, W indicates a wall portion provided so as to be connected to the opening A.

In this safety fence S, columns 31 are erected at a predetermined interval on a floor portion F facing the opening A, and rods 32 are horizontally fixed to each column 31. The support 31 is fixed to a portion of the floor F facing the opening A in the following manner. That is, the insertion pipe 34 is fixed to the uppermost reinforcing bar R located at the above-mentioned portion of the floor F by the iron wire 33 called a number wire (FIG. 15), and the concrete C is poured in this state ( 16), the portion excluding the upper end portion of the insertion pipe 34 is embedded in the concrete C, and the lower end portion of the support column 31 is inserted into the insertion pipe 34 to fix the support column 31. In addition, in FIG.15 and FIG.16, G shows the formwork used when the concrete C is poured.

After constructing a structure (for example, an elevator device) in the opening A, the safety fence S is removed. Here, the above-mentioned insertion pipe 34 has a floor portion F at its upper end portion.
Since it protrudes from the above, it is necessary to process it at the same time when the safety fence S is removed. Conventionally, the concrete C around the insertion pipe 34 is removed (FIG. 17), and in this state, the upper end of the insertion pipe 34 is melt-cut by a gas burner (FIG. 18), and then the insertion pipe 34 is inserted. Concrete C was buried again in the hole 35 from which the concrete C had been removed to melt the pipe 34 (FIG. 19).

As described above, in the conventional structure using the insertion pipe 34, the concrete C around the insertion pipe 34 is removed, the upper end of the insertion pipe 34 is melted, and the removed concrete C is repaired. Each work is required. As described above, the installation of the safety fence S and the removal thereof are unrelated to the construction of the main body of the structure, which requires a great deal of cost. In particular, the work of melting the insertion pipe 34 with a gas burner is extremely troublesome and takes a lot of time, and there is a problem that the surrounding concrete is burned and discolored due to the heat insulation. Since many insertion pipes are buried to construct one reinforced concrete structure, the cost required for fusing them is great.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a fixture for fixing a support post for a safety fence provided on the periphery of a reinforced concrete structure during the construction of the reinforced concrete structure. The task is to make it easy to remove the entry pipe.

[0007]

According to the present invention for solving the above-mentioned problems, a lower half portion is substantially embedded in concrete poured into a reinforced concrete structure, and a peripheral portion thereof is provided during construction of the structure. A fixture for fixing a safety fence support provided, for connecting the insertion pipe for inserting the lower end of the safety fence support and the insertion pipe separably via a connecting means. The insert pipe connecting tool, and the concrete is placed by temporarily fixing the insert pipe connecting tool connecting the insert pipes to the member constituting the structure by the temporary fixing means. All of the pipe connectors and the lower end portion of the insertion pipe are embedded in the concrete, and only the insertion pipe can be separated from the insertion pipe connector and extracted.

[0008]

According to the present invention, the insertion pipe connecting tool connected to the insertion pipe is temporarily fixed to the member constituting the structure by the temporary fixing means, and when concrete is placed in this state, the entire insertion pipe connecting tool and The lower end of the bayonet pipe is buried in concrete. The lower end of the safety fence post is inserted and fixed into the insertion pipe whose lower end is embedded in concrete. To remove the insertion pipe when removing the safety fence, apply a rotational force in a specified direction to the insertion pipe and rotate it slightly to release the adhesion between the outer peripheral surface of the insertion pipe and concrete. To be done. After that, the insertion pipe connected to the insertion pipe connecting device via the connecting means is separated from the insertion pipe connecting device and pulled out. Note that the plug-in pipe connector remains embedded in the concrete.

[0009]

EXAMPLES The present invention will be described in detail below with reference to examples. FIG. 1 is an exploded perspective view of a fixture for a safety fence post according to the present invention, FIG. 2 is a side sectional view of the fixture, FIG. 3 is a front view of the same, and FIG. FIG. 6 is a side sectional view showing a state in which this fixing tool is temporarily fixed to the reinforcing bar R, and FIG.
FIG. 4 is a front sectional view of the same. First, FIGS.
The fixture according to the present invention will be described with reference to, and then the method of using the fixture will be described. The fixture according to the present invention includes a male pipe 1 provided on the outer peripheral surface of the lower end portion thereof, and a male pipe 1 provided on the outer peripheral surface of the male pipe 1 and the male pipe 1 which is temporarily fixed to the reinforcing bar constituting the floor of the reinforced concrete structure. And an insertion pipe connecting tool D for connecting with each other. An insertion hole 3 for inserting the turning rod 2 (see FIG. 7) is provided in the upper end portion of the insertion pipe P, and the insertion hole 3
Two sets of butterfly bolts 4 which are one-to-one set are screwed at predetermined intervals along the axial direction of the insertion pipe P at portions where the phases differ by 90 °. The butterfly bolt 4 is for fixing the lower end portion of the pillar 31 of the safety fence S inserted into the insertion pipe P.

In the insertion pipe connector D, a female screw 6 to be screwed with the male screw 1 at the lower end of the insertion pipe P is provided on the inner peripheral surface of the peripheral wall portion 5a of the bottomed short cylindrical body 5 and its bottom plate. Part 5b
A pair of temporary fixing plates 7 are fixed to each other by welding, and a nut 8 is fixed to the bottom surface side of the central portion of the bottom plate portion 5b.
A fixing bolt 9 is screwed onto the nut 8. The pair of temporary fixing plates 7 are provided with a reinforcing bar insertion groove 7a for inserting the reinforcing bar R, and the reinforcing bar insertion groove 7a is
The width gradually increases from the back side toward the opening side in order to facilitate the insertion of the. The pair of temporary fixing plates 7 are
The bottomed short cylindrical body 5 is fixed at a symmetrical position with respect to the axis of the cylindrical body 5, and a fixing bolt 9 is arranged therebetween. Further, at the tip of the fixing bolt 9 protruding from the bottom plate portion 5b of the bottomed short cylindrical body 5 toward the bottom surface side, a pressing member (a nut in the embodiment) for ensuring pressing against the upper surface portion of the reinforcing bar R is performed. 11) which is fixed by welding. Further, an L-shaped anchor member 12 is fixed to a portion of the peripheral wall portion 5a of the bottomed short cylindrical body 5 located on the side opposite to the opening side of the reinforcing bar insertion groove 7a, and is directed toward the bottom surface side of the bottom plate portion 5b. Has been extended.

Next, a description will be given of the case where the support 31 of the safety fence S provided around the opening A is fixed by using the above-mentioned fixture. First, the insertion pipe connector D is temporarily fixed to the uppermost horizontal reinforcing bar R arranged in the portion of the floor F facing the opening A. That is, with the reinforcing bars R inserted in the reinforcing bar insertion grooves 7a of the pair of temporary fixing plates 7 constituting the insertion pipe connector D, the fixing bolt 9 is rotated to press the pressing member 11 fixed to the lower end thereof. Is pressed against the upper surface of the reinforcing bar R (FIGS. 4 to 6). As a result, the insertion pipe connector D is temporarily fixed to the reinforcing bar R, and as shown in FIG. 5, since the fixing bolt 9 is arranged between the pair of temporary fixing plates 7, the insertion pipe connection device D The tool D is stably and temporarily fixed to the reinforcing bar R.

Next, the turning rod 2 is inserted into the insertion hole 3 of the insertion pipe P.
The insertion pipe P is rotated by the turning rod 2, and the male screw 1 at the lower end of the insertion pipe P is screwed into the female screw 6 of the bottomed short cylindrical body 5. The pipe P is connected (FIG. 7). In this state, when concrete C is placed in the part that becomes the floor F, the plug connector D
And the lower end of the plug-in pipe P is the concrete C
It is embedded inside and is fixed in a state where the insertion pipe P projects from the floor surface of the floor portion F (FIG. 8). Plug-in pipe connector D
Since the anchor member 12 provided on the floor is embedded in the concrete C, the fixing strength of the insertion pipe P with respect to the floor F is large. Then, as shown in FIG. 11, the floor portion F
A large number of insertion pipes P are fixed to the portion facing the opening A at a predetermined interval, and the lower ends of the large number of support columns 31 forming the safety fence S are inserted into the respective insertion pipes P, The lower end of the column 31 is fixed to the insertion pipe P by the butterfly bolt 4.

Then, after constructing a structure such as an elevator device in the opening A, when removing the safety fence S, in order to pull out the insertion pipe P protruding from the floor surface of the floor portion F, To do so. That is, the insertion pipe P
When the turning rod 2 is inserted into the insertion hole 3 of No. 2 and the turning rod 2 momentarily applies a large rotational force in the extracting direction to the insertion pipe P, the insertion pipe P is slightly rotated. The close contact between the outer peripheral surface and the concrete C is released. After this, the insertion pipe P is smoothly rotated by a small rotational force, separated from the insertion pipe connector D, and extracted (FIG. 9). Then, concrete C is embedded in the hole 13 formed by extracting the insertion pipe P to close the hole 13 (FIG. 10). In this way, the insertion pipe P fixed to the floor portion F can be easily pulled out, and the insertion pipe connector D remains buried in the concrete C of the floor portion F.

Further, the above embodiment is an example of the reinforcing bar in which the temporary fixing symmetry of the plug-in pipe connector constitutes the reinforced concrete structure. This plug-in pipe connector is constructed or constructed of the reinforced concrete structure. Depending on the mode, it may be used by temporarily fixing it to a steel frame, a mold or the like. In the example shown in FIG. 13, an internal thread is provided on the inner peripheral surface of the ring body to form an insertion pipe connector D ′, and the insertion pipe connector D is attached to the steel frame 14 embedded in the floor of the concrete structure. 'Is temporarily fixed by welding W, and the female screw on the inner peripheral surface of the ring body,
This is an example in which a male screw provided on the outer peripheral surface of the lower end portion of the insertion pipe P is screwed to connect both. In addition, in the example shown in FIG. 14, the insertion pipe connector D ′ is fixed to the upper end of the leg body 15 by welding, and the leg body 15 is nailed to a formwork 16 for forming a floor portion (slab). This is an example of temporarily fixing with 17. In either case, concrete is placed in a state where the insertion pipe P is screwed to the insertion pipe connector D ′.

Further, in the above-mentioned embodiment, the example of fixing the support post for the safety fence provided around the opening of the floor portion of the reinforced concrete structure has been described. The fixture according to the present invention is the floor of the reinforced concrete structure. It can also be used when fixing a support post for a safety fence provided at a dangerous place such as a peripheral edge of a portion or an edge of another structure. Furthermore, the connecting means for connecting the insertion pipe to the insertion pipe connecting device in a separable manner is not limited to the "screw" as in the above-mentioned embodiment, and after the concrete is poured, Any structure may be used as long as the insertion pipe can be separated and pulled out from the insertion pipe connector embedded in the concrete.

[0016]

EFFECT OF THE INVENTION A fixture for a safety fence post according to the present invention is
An insertion pipe for inserting the lower end of the safety fence support,
And an insertion pipe connector for detachably connecting the insertion pipe via a connecting means, and the temporary fixing means configures the structure of the insertion pipe connector to which the insertion pipe is connected. Concrete is placed in a state where it is temporarily fixed to the member, the entire insert pipe connector and the lower end of the insert pipe are embedded in the concrete, and only the insert pipe is inserted from the insert pipe connector. Since it can be separated and extracted, the insertion pipe that constitutes the fixture can be extracted very easily, and at the time of extraction, there is no possibility of soiling or damaging the surrounding concrete. As a result, it is no longer necessary to melt the upper end of the insertion pipe with a gas burner as in the conventional case.
The cost of disposing the plug-in pipe when removing the safety fence is also reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a fixture for a support for a safety fence according to the present invention.

FIG. 2 is a side sectional view of the fixture.

FIG. 3 is a front view of this fixture.

FIG. 4 is a side sectional view showing a state in which the fixing tool is temporarily fixed to a reinforcing bar R.

FIG. 5 is a front sectional view of the same.

FIG. 6 is a side sectional view showing a state in which the insertion pipe connector D is temporarily fixed to the reinforcing bar R.

FIG. 7 is a side sectional view showing a state in which an insertion pipe P is screwed into an insertion pipe connector D temporarily fixed to a reinforcing bar R.

FIG. 8 is a side sectional view showing a state in which a support post 31 for a safety fence is inserted into an insertion pipe P fixed to a floor portion F.

FIG. 9 is a side sectional view showing a state in which the insertion pipe P is pulled out when the safety fence S is removed.

FIG. 10 is a side sectional view showing a state in which concrete C is embedded in a hole 13 formed by pulling out the insertion pipe P.

FIG. 11 is a plan view showing an opening A provided in a floor portion F of a reinforced concrete structure.

FIG. 12 is a sectional view of the same.

FIG. 13 is a view showing a state in which an insertion pipe connector D ′ is temporarily fixed to a steel frame 14 by welding.

FIG. 14 is a view showing a state in which an insert pipe connector D ′ is temporarily fixed to a leg 15 temporarily fixed to a mold 16 by welding.

FIG. 15 is a side sectional view showing a state in which the insertion pipe 34 is fixed to the reinforcing bar R by the iron wire 33.

FIG. 16 is a side cross-sectional view showing a state in which most of the insertion pipe 34 is embedded in the concrete C cast on the floor F.

FIG. 17 is a view for cutting the upper end of the insertion pipe 34 by fusing.
It is a side surface sectional view in the state where concrete C of the circumference was removed.

FIG. 18 is a side sectional view showing a state in which an upper end portion of the insertion pipe 34 is melted and cut.

FIG. 19 is a side sectional view showing a state in which concrete C is embedded in a hole portion 35 in which the insertion pipe 34 is melted and cut.

[Explanation of symbols]

 A: Opening C: Concrete D, D ': Insert pipe connecting tool F: Floor P: Insert pipe R: Reinforcing bar (member that constitutes the structure) S: Safety fence 1: Male screw of insert pipe 5: Yes Short bottom cylindrical body 6: Female screw of bottomed short cylindrical body 7: Temporary fixing plate (temporary fixing means) 7a: Reinforcing bar insertion groove 9: Fixing bolt 12: Anchor member

Claims (4)

[Claims] 1. A fixture for fixing a safety fence support provided in a peripheral portion of a reinforced concrete structure, the lower half of which is substantially embedded in the concrete when the structure is being constructed. And a inserting pipe for inserting the lower end of the safety fence support and an inserting pipe connecting tool for separably connecting the inserting pipe through a connecting means. Concrete is placed in a state in which the plug-in pipe connecting tool connected to the plug-in pipe is temporarily fixed to a member constituting a structure, and the entire plug-in pipe connecting tool and the lower end portion of the plug-in pipe are A fixture for a post for a safety fence provided during construction of a reinforced concrete structure, which is embedded in concrete, and is capable of being separated and withdrawn only from the insert pipe connecting device. 2. The member for temporarily fixing the insertion pipe connector is a reinforcing bar, and the temporary fixing means has a reinforcing bar insertion groove, and is provided on a bottom surface of a main body of the insertion pipe connector. It consists of a pair of temporary fixing plates fixed at intervals and fixing bolts screwed to the bottom of the main body, and inserts a reinforcing bar into each reinforcing bar insertion groove of the pair of temporary fixing plates to fix it. The fixture for a safety fence post provided during construction of a reinforced concrete structure according to claim 1, wherein the insertion pipe connector is temporarily fixed to the reinforcing bar by pressing a bolt against the upper surface of the reinforcing bar. . 3. A connecting means for connecting the insertion pipe to the insertion pipe connecting device so that the insertion pipe can be separated from each other. The fixture for a safety fence post provided during construction of a reinforced concrete structure according to claim 1, characterized in that the fixture is formed of an internal thread formed on the inner peripheral surface of the insertion pipe connector. 4. The fixture for a safety fence post provided during construction of a reinforced concrete structure according to claim 1, wherein an anchor member is integrally provided on the plug connection tool.