JP6085151B2 - Floor opening hole filling method and formwork used therefor - Google Patents

Description

The present invention relates to a floor opening portion filling method for filling an opening formed in a floor into an original flat floor surface, and a mold used for the method.

In RC structures (reinforced concrete structures), SRC structures (steel reinforced concrete structures), S structures (steel structures), etc., which have a multi-story concrete floor, for example, air conditioning ducts are placed on the concrete floor. Openings are formed for various purposes such as penetrating. When such an opening becomes unnecessary due to the renovation work, in order to make the floor portion usable, it may be necessary to fill the hole with a filler such as mortar concrete after the incision is made.

In this case, for example, the following construction is conventionally performed.
FIG. 4 shows a floor opening 100a to be constructed, and FIG. 4A shows a plan view and FIG. 4B shows a sectional side view. FIG. 5 and FIG. 6 are explanatory diagrams showing a construction procedure, in which the left side shows a plan view and the right side shows a sectional side view.

The opening 100a shown in FIG. 4 has a square shape in plan view, and the size is, for example, 350 mm long and about 400 mm wide in the plan view. This dimension naturally varies depending on the size of ducts, piping groups, cable racks and the like that have penetrated the floor. A floor slab 100 is provided around the opening 100a. The thickness of the floor slab 100 is about several tens of centimeters such as 150 mm and 200 mm.

To explain the construction procedure, in Step 1 shown in FIG. 5A, first, a scaffold is temporarily installed on the lower floor of the floor slab 100 or a moving scaffold is temporarily installed, and an operator approaches the lower surface of the floor slab 100 from below. Try to put it on. And the horizontal hole a1 is made in the floor slab 100 which formed the peripheral surface of the opening part 100a, a reinforcing bar is inserted in this, and the horizontal difference bar anchor 1 is constructed in the opening part 100a. Here, two differential anchors 1 are provided on each of the four surfaces forming the peripheral surface of the opening 100a, and are arranged so as to intersect vertically and horizontally at different heights.

In step 2 of FIG. 5B, an operator places a flat plate (concrete plywood for concrete formwork, commonly called “compane”) 2 having an appropriately small hole from the lower surface of the floor slab 100 so as to contact the upper part around the opening. The lower surface of the opening 100a is temporarily sealed. Another worker located on the floor horizontally places the two angle members 3 having the through-holes 3a on the upper surface of the slab 100, and positions them in a bridging manner between the opposite sides of the opening 100a.

Thereafter, each of a plurality of blunt iron wires (commonly called “number wires”) 4 is bent in a U shape, and two vertical lines are formed for each number wire formed in the panel 2 in advance as described above. An operator on the floor mainly performs the operation of inserting the through holes 2a in the direction, guiding the pair of end portions of each wire 4 upward, and inserting and passing through the adjacent through holes 3a of the angle member 3. In this state, a pair of end portions of each wire 4 is twisted and coupled to form an annular shape, and the panel 2 is pulled into the perforated angle member 3 side and brought into close contact with the lower surface of the floor slab 100. After this, the underfloor worker who supported the control panel 2 from under the floor is released.

In Step 3 shown in FIG. 6A, the mortar 5 is poured from above the opening 100a using the panel 2 as a lower mold. The lower surface of the mortar 5 is molded by the panel 2. The upper surface 5 a of the mortar 5 before solidification is leveled slightly lower than the upper surface of the floor slab 100. In this state, the mortar 5 is solidified.

In step 4 of FIG. 6B, the downstairs scaffolding is used again, the moving scaffolding is again installed, the underfloor worker and the abovefloor worker are arranged, each wire 4 is cut, the control panel 2 and the opening angle Remove material 3.
In step 5 of FIG. 6C, the portion of the wire 4 protruding from the upper and lower surfaces of the solidified mortar 5 is cut off. On the lower surface of the floor slab 100 below the floor, the wire 4 remains even if it is cut with nippers. The top surface 5 a of the mortar 5 is covered with the finishing mortar 6 and matched with the top surface of the floor slab 100.

Patent Document 1 discloses a technique for forming a formwork by fastening a panel with bolts and nuts in order to suppress the ejection of concrete and create a smooth casting surface when casting concrete. Further, Patent Document 2 discloses a technique in which a mortar is driven by supporting a floor frame panel from a floor slab on a lower floor by a support pile when placing the floor slab.

JP 2011-157778 A JP 2000-8610 A

The above-described floor opening hole filling method has the following problems.
That is, the portion of the number 4 that protrudes downward from the lower surface of the mortar 5 is cut out in the step 5, but it is impossible to cut the number 4 with the lower surface of the mortar 5 at this time. The part appears in the appearance part. For this reason, the appearance of the lower surface of the closed portion of the opening 100a is impaired. And since the cut part of this wire 4 appears on the upper surface of the mortar 5 in the same manner, it is necessary to look at the coating allowance of the finished mortar excessively, which is troublesome.

In addition, the weight of the mortar 5 placed in the opening 100a in step 3 is supported by the wire 4 via the control panel 2. However, when the construction procedure described above is used, the wire 4 is attached by the weight of the mortar 5. A phenomenon occurs in which the control panel 2 is lowered due to elongation. When this phenomenon occurs, the mortar 5 is pushed out from between the lower surface of the floor slab 100 and the panel 2 and protrudes outside the opening 100a and solidifies. The appearance on the lower surface side of the mortar 5 after removing the control panel 2 will be greatly impaired. It is practically difficult to solve this problem simply by increasing the number of wires 4 used because of the nature of the wires 4 and the work space. In the renovation work, it is almost difficult to support the control panel 2 by raising the support pile from the lower floor as in Patent Document 2.

  The present invention was devised to solve the above-described problems, and the formwork can be simplified by the work of the floor where the renovation work is performed and the work under the work, or the work where the work is done only in some cases. It is another object of the present invention to provide a construction method that is firmly installed and fills a floor opening and a formwork used therefor.

According to the present invention, a method of filling an opening portion opened in a floor with a mortar includes constructing a differential bar anchor with a horizontal reinforcing bar from the peripheral surface of the opening portion into the opening portion, and bridging the opening portion. In passing the beam material to and covering the opening with a flat plate from the lower side of the opening, between the through hole provided in the beam material and the through hole provided in the flat plate, than the thickness of the floor A short first screw rod, a first nut threaded into one end of the first threaded rod, and a first thread threaded into the other end of the first threaded rod. 2 nuts, a second screw rod screwed to the other thread of the first nut, and a third screw rod screwed to the other screw thread of the second nut, A screw tool whose length from the 1 nut to the second nut corresponds to the thickness filled with the mortar. Arranged to, preliminarily screwed by the third nut from the through-hole of the plate is protruded the second screw of the screw member, then, the flat plate in which the screw member is engaged butterflies of the opening The screw tool side is applied to the periphery of the opening so as to cover the opening from below, and is screwed upward to the flat plate applied to the periphery of the opening on the floor. The third screw rod of the screw tool is protruded from the through hole of the beam member, and a third nut is screwed to support the flat plate on the beam member, and then mortar is filled from above the opening. After the mortar is hardened, the second screw rod, the third screw rod and the nut are removed from the first nut from the second nut, the beam material and the flat plate are removed, and the floor opening is filled.

According to the present invention, the position of the control panel is stably maintained by connecting the control panel and the beam member via the screw tool including the first nut, the second nut, the first screw rod, the second screw rod, and the third screw rod. Therefore, it is possible to suppress leakage into the mortar from between the lower surface of the floor slab and the control panel.

In addition, since it is not necessary to use a conventional wire for holding the position of the panel, the wire does not impair the appearance of the lower surface side of the placing mortar or the like. And since the 1st nut, the 2nd nut, and the 1st screw rod are embedded in mortar and the 2nd screw rod and the 3rd screw rod are finally removed, it impairs the appearance of the undersurface side of the closed floor. There is no.

  Further, when the first nut and the second nut are used so that the female screw is positioned in the external portion, the hook member or the like can be screwed through the female screw when necessary. Moreover, the finishing process using a mortar only needs to cover the end surface of the first nut or the second nut.

It is a front view of a screw tool. It is a figure which shows the procedure which plugs up opening of the floor surface made from concrete. It is a figure which shows the procedure performed following the construction procedure shown in FIG. It is a figure which shows an example of opening of the floor made from concrete. It is a figure for demonstrating the construction procedure in the past. It is a figure explaining the procedure following the construction procedure shown in FIG.

Hereinafter, the floor opening portion filling method according to the present embodiment will be described.
FIG. 1 shows a screw tool 101 according to the present construction method, wherein A is an exploded front view and B is a front view in use.

The screw tool 101 is used for forming a mold, and includes a first screw rod 7, a second screw rod 8, a third screw rod 9, a first nut 10, and a second nut 11. In addition, the third nut 12 and four washers 13a, 13b, 13c, and 13d are used as accessories attached to the screw tool 101.

The first screw rod 7 is shorter than the thickness of the floor slab and shorter than the thickness of the mortar that is initially poured into the mold. This is a length in which the first nut 10 and the second nut 11 are screwed to both sides of the first screw rod 7 to about half, and the first nut 10, the second nut 11 and the first screw rod 7 are combined. However, when the thickness of the mortar that is initially poured into the mold is about the same length, about half of the threads that are not screwed into the first nut 10 and the second nut 11 remain. is there.

The first nut 10, the second nut 11, and the third nut 12 are not so-called “cap nuts”, and female threads are formed in the entire length range of the through holes.
If each threaded rod 7, 8, 9 is provided with a thread at a position where it is screwed with the first nut 10, the second nut 11, and the third nut 12, it does not necessarily form a male thread in its entire length range. May be.

Next, this construction method will be described.
Here, it is assumed that construction is performed to close the opening 100a shown in A and B in FIG. 4 by placing mortar.
FIG. 2 is an explanatory view showing the procedure of the present construction method, in which the right side shows a plan view and the left side shows a cross section in a side view. FIG. 3 is a diagram for explaining a construction procedure performed following the construction procedure shown in FIG. 2, in which the right side shows a plan view and the left side shows a cross section in a side view.

First, in Step 1 shown in FIG. 2, a scaffolding is temporarily installed on the lower floor of the floor slab 100 or a moving scaffold is temporarily installed so that the worker can approach the lower surface of the floor slab 100 from below. To do. Then, as shown in step 1 of the conventional example shown in FIG.
In step 2, an appropriate number (for example, two) of beam members 30 are horizontally placed on the upper surface of the floor slab 100 and placed by an operator on the floor in a bridging manner between the opposed peripheral surfaces of the opening 100a. As the beam material, it is preferable to use an angle material as in the conventional example described above.

Next, the screw tool 101 is assembled as shown in FIG. 1B. That is, the 1st nut 10 and the 2nd nut 11 are connected with the both ends of the 1st screw rod 7, and it is set as the length substantially the same as the thickness of the mortar poured in initially. At this time, the first nut 10 and the second nut 11 are partially threaded, and the unthreaded thread remains about half as the other thread. . Then, the second screw rod 8 and the third screw rod 9 are screwed into the remaining thread from both sides. The third screw rod 9 is passed through the through hole 3a of the beam member 30 disposed on the upper surface of the floor slab 100, and both sides of the through hole 3a are sandwiched between washers 13a and 13b and fastened with the third nut 1. .

The panel 2 is applied to the opening 100a from below the floor slab 100 so that the lower surface of the opening 100a is sealed, and the second screw rod 8 is passed through the through hole 2a of the panel 2. The through-hole 2a is a hole that has been opened in advance for the position of the second screw rod 8. Further, a beam member 31 (an angle member is used as in the upper portion) is arranged from the lower side of the panel 2 and fastened with a third nut. Washers 13c and 13d are arranged with the panel 2 and the beam 31 interposed therebetween. As a result, the panel 2 is supported by the beam member 30 through the screw tool 101.
Here, if step 1 ′ shown in FIG. 3C is performed between step 1 and step 2, the work can be carried out more efficiently. That is, since the thickness of the slab 100 is often known in advance, in order to omit the assembly at the position of the opening 100a as a setup in advance, the through hole 2a that is opened in advance to allow the second screw rod 8 of the panel 2 to pass therethrough. Each time, a second screw rod 8 in which a washer 13d and a third nut 12 are screwed from one end is passed through, and a washer 13c and a first nut 10 as a long nut are connected to the panel 2 from the other end of the second screw rod 8. The first nut 10 is fixed so that the first nut 10 stands upright perpendicularly to the control panel 2. Thereafter, the first screw rod is hinged to the first nut 10, and then the second nut 11 is hinged to the other end of the first screw rod 7, and the distance between the upper surface of the panel and the upper end of the second nut 11 is set to the mold frame. Adjust the length to be almost the same as the thickness of the mortar poured in the initial stage. And the 3rd screw rod 9 is hinged so that the 2nd nut 11 may not rotate, and the screw tool is formed. The workability is improved by setting this in advance in a work place that is not local. This set is pressed from the lower surface of the opening 100a so that the worker under the floor contacts the lower surface of the opening 100a with the screw tool facing upward (a in FIG. 3C). After pressing this set from the lower surface of the opening 100a, on the floor, after confirming that the upper end of the second nut 11 is at a mortar thickness level that is initially poured, the third nut 11 is turned on by fitting the female screw of the second nut 11. After the screw rod 9 is screwed and installed, the washer 13b is placed on the upper end of the second nut 11 and then passed through the through hole 3a of the beam member 30, and the washer 13a and the third nut 12 are inserted from above the through hole 3a. The panel 2 is screwed onto the third screw rod 9 and is firmly lifted and fixed by the beam member 30.
The alignment of the beam member 30 which is the angle member 3 can be automatically performed, and the work on the floor can be performed very smoothly by the hinged attachment of the washer 13a and the third nut 12 via the beam member 30.

In step 3, the mortar 5 is placed in the opening 100 a and the initial pouring is performed until reaching the lower surface of the upper beam member 30.
In Step 4, after the mortar 5 is hardened, the third nut 12, the washers 13c and 13d, the panel 2 and the beam member 31 are removed from the second screw rod 8 on the lower surface side of the floor slab 100, and the second screw rod 8 is removed. 1 Remove from the nut 10. Further, on the upper surface side of the floor slab 100, the third nut 12, washers 13 a and 13 b and the beam member 30 are removed from the third screw rod 9 and the third screw rod 9 is removed from the second nut 11.

The first nut 10, the first screw rod 7, and the second nut 11 are embedded in the mortar 5. Therefore, the lower end surface of the first nut 10 is exposed to the outer surface of the mortar 5 at a depth position corresponding to the thickness of the washer 13c. Further, the upper end surface of the second nut 11 is exposed on the outer surface of the mortar 5 at a depth corresponding to the thickness of the washer 13b. On the upper and lower surfaces of the mortar 5, the marks of the washers 13 b and 13 c are formed as recessed portions 5 b at the exposed portions of the first nut 10 and the second nut 11. And the 1st nut 10 and the 2nd nut 11 will be in the state which the end surface shape can be seen through this recessed part 5b.

In step 5, finishing mortar 7 is supplied to the recessed portion 5b existing at the exposed portion of the first nut 10 and the second nut 11 as necessary to hide the portion. Alternatively, the recessed portion 5b may be left as it is without performing any processing. If it does in this way, the 1st nut 10 can utilize a hanging hook etc. for screwing to this female screw.

In the above embodiment, the first threaded rod 7, the second threaded rod 8, and the third threaded rod 9 are all formed with male threads in the entire length range, but these threaded rods 7, 8, 9 are suitable. It is possible to form a latching surface for latching the mouth of a hand tool (such as a spanner or a monkey wrench) at any position. In this way, the screw rods 7, 8, 9 and the nuts 10, 11, 12 can be easily attached / detached with a hand tool when it is difficult to attach / detach the nuts 10, 11, 12 only by hand. Further, the lower beam 31 for supporting the control panel 2 can be omitted depending on circumstances.
In addition, the second screw rod 8, the third nut 12, the beam member 31, the panel 2, the first nut 10, the first screw rod 7, and the second nut 11 are assembled in advance as a set at a work site that is not on-site. If the arrangement is made, if the diagonal dimension of the opening 100a is large even with the addition of the necessary flat cover dimensions of the panel 2 and additional bolts, and the floor slab 100 formed around the opening 100a, A structure in which a hole-in anchor is inserted into the opened horizontal hole a1 and a female screw is installed therein, and the insertion end portion of the differential muscle anchor 1 inserted in the horizontal direction in the opening 100a is a male screw and is screwed to the hole-in anchor. If it is possible to detach and attach the differential muscle anchor 1, the operator on the floor holds one of the first screw rods 7 and tilts the set to dodge the diagonal of the opening. It is, it may be possible to contact the floor of the control panel 2 under the floor. In this case, a worker under the floor becomes unnecessary.

101 Screw 2 Flat plate
3 Angle material 5 Mortar 7 First screw rod 8 Second screw rod 9 Third screw rod 10 First nut 11 Second nuts 13a to 13d Washers 30, 31 Beam material

Claims (3)

In the method of filling the opening opened in the floor with mortar, construct a differential reinforcement anchor with a horizontal reinforcing bar from the peripheral surface of the opening into the opening, and bridge the opening to a beam material on the upper surface of the floor When the opening is covered with a flat plate from the lower side of the opening , a first shorter than the floor thickness is provided between the through hole provided in the beam member and the through hole provided in the flat plate. A first nut in which a part of the thread is screwed to one end of the first threaded rod; a second nut in which a part of the thread is threaded to the other end of the first threaded rod; A second screw rod threadedly engaged with the other thread of the first nut, and a third threaded rod threadedly engaged with the other thread of the second nut. A screw tool whose length up to the second nut corresponds to the thickness filled with the mortar is arranged. Te, preliminarily screwed by the third nut from the through-hole of the plate is protruded the second screw of the screw member, then, the flat plate in which the screw member is engaged butterfly below the opening From above, the screw tool side is applied to the periphery of the opening so as to cover the opening so as to cover the opening, and on the floor, the screw is screwed upward to a flat plate applied to the periphery of the opening. The third screw rod of the screw tool is protruded from the through hole of the beam member, the third nut is screwed together, the flat plate is supported by the beam member, mortar is filled from above the opening, After the mortar has hardened, the second screw rod, the third screw rod and the nut are removed from the first nut from the second nut, and the beam material and the flat plate are removed. If the diagonal dimension of the opening is large even with the necessary flat cover size of the flat plate and additional dimensions of bolts, the insertion end of the differential anchor that is inserted horizontally into the opening from the peripheral surface of the opening The part is made into a male screw, and a hole-in anchor is put in a horizontal hole that is opened to insert the differential muscle anchor, and the female screw is installed so that the differential muscle anchor can be attached and detached. The screw rod, the first nut, the first screw rod, and the second nut are screwed, and the flat plate is interposed between the third nut and the first nut that are screwed to the second screw rod. By assembling and setting up as a set in advance through a washer, the one set of the first screw rod is held from the floor and the set is tilted before wearing the differential anchor. By passing the mouth diagonal line, the flat plate is brought into contact with the floor from above the floor, and the third screw rod of the screw tool screwed upward to the flat plate applied around the opening is used as the beam member. Projecting from the through-hole, screwing a third nut to support the flat plate on the beam member, and then screwing the male screw at the insertion end into the female screw in the hole-in-anchor of the horizontal hole. 2. The floor opening hole filling method according to claim 1, wherein the difference bar anchor is installed and then mortar is filled from above the opening . An angle member that is in contact with the lower surface of the flat plate is arranged under the flat plate, and a nut is inserted into the second screw rod through a through hole provided in the angle member in addition to the through hole of the flat plate. The floor opening portion filling method according to claim 1, wherein the floor opening portion is filled with screws.