JP3680566B2 - CONCRETE STRUCTURE THROUGH HOLE MOLDING DEVICE AND CONCRETE STRUCTURE THROUGH HOLE MANUFACTURING METHOD - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a through-hole forming apparatus in which both end portions are held in openings of a pair of molds facing each other at a predetermined interval when manufacturing a concrete structure having a through-hole, and a through-hole manufacturing method using the same In particular, it is useful for the long-span precast segment method.
[0002]
[Prior art]
When the length of the through-hole is about 1 m or less, the through-hole is often formed by holding only the spiral sheath tube at both mold openings. A through hole having a length exceeding about 1 m is a rigid pipe made of steel, hard vinyl chloride or the like with a sheath tube as a through hole formed body, and is held by both mold openings. The device is known. In this apparatus, after the concrete material is solidified, the pipe is removed, and finishing operations for cutting and removing the sheath tube protruding from the opening are performed. This finishing operation is performed in the same manner in the production of through holes of 1 m or less.
[0003]
[Problems to be solved by the invention]
However, the above apparatus has the following problems. When only the spiral sheath tube is used, deformation of the through-hole formed by the pressure and weight of the concrete placement or weight is easily generated. In order to prevent this, the rigid pipe inserted into the sheath pipe becomes heavy in the case of a long-span through hole, and is not easy to handle and store manually at the concrete placement site. In addition, finishing operations such as cutting / removal of the sheath tube protruding from the opening of the through hole and polishing of its end face are inevitable. Furthermore, since there is an excess gap between the inner peripheral surface of the sheath tube and the outer peripheral surface of the rigid pipe, it is likely to drop into the outer peripheral surface of the sheath tube due to the pressure and weight of the concrete casting, and deformation such as dents is likely to occur. Since the pipe is held by the mold, the sheath tube is likely to be displaced in the radial direction of the mold opening, and it is difficult to remove the pipe. Thereby, it is not easy to select the outer diameter of the pipe suitable for the sheath tube, and it may be necessary to make a prior trial for placing concrete.
[0004]
Furthermore, in order to facilitate the insertion of the sheath tube into the mold opening, the outer diameter of the sheath tube is smaller than the diameter of the mold opening, so that leakage of the concrete material from the gap is inevitable. In particular, in the case of a long-span precast segment method, there is a concern that the manufactured segment may have insufficient strength near the opening of the through-hole due to discharge leakage, which may affect the function. In addition, finishing work such as peeling of the leaked concrete is essential.
[0005]
The present invention has been made in view of these problems, and provides a through-hole forming apparatus for a concrete structure and a through-hole manufacturing method using the same. The first problem is to reduce the weight and reduce the size of the apparatus. Remarkably facilitate handling, installation, removal, storage, etc. of the equipment, the second problem is to prevent deformation of the through-hole formation over the long span, and the third problem is the opening of the mold There is no leaking of concrete material from
[0006]
[Means for Solving the Problems]
The invention according to claim 1, which solves the above-mentioned problem, is a through-hole forming device used when manufacturing a concrete structure having a through-hole, and the device is flexible so that it can be expanded and contracted by fluid entry and exit. A pair of molds that are configured by a tube body and a flexible cylindrical body that is externally mounted on the tube body and has a predetermined shape as the hole forming body, with both ends of the device facing each other at a predetermined interval When both are held in the openings of the frame, the both ends are the tube bodies, and both openings of the cylindrical body of the device are respectively located inside the mold opening. Have means .
[0007]
As a result, the tube body of the device can be expanded and contracted in the radial direction and folded in the length direction by entering and exiting the fluid, and the tube body can be reduced in weight and reduced in size, and can be carried in, installed, held, removed, and stored. Is significantly easier. Furthermore, since the tube body that has been pressurized and expanded closely adheres to the substantially entire length of the inner peripheral surface of the cylindrical body having a predetermined shape, the tube body has a function as a rigid reinforcing body, and the hole forming body This prevents deformation and displacement. Furthermore, since the end portion of the apparatus held in the openings of both molds is a flexible tube body that is pressurized and expanded, there is no leakage of the concrete material from the openings. Furthermore, since the entire length of the cylindrical body is embedded in the mold, the finishing work for the opening of the concrete structure is not necessary.
[0008]
According to a second aspect of the invention, it comprises means and wherein the Oite to claim 1, the tube body is a rubber hose. From this, since the rubber elasticity that is fluid-pressed is added to the tube body that is in close contact with the inner peripheral surface of the cylindrical body having a predetermined shape, the tube body further enhances its function as a rigid reinforcing body. Become. Further, since the tube body is easily expanded due to rubber elasticity, it is easy to select a tube body that matches the diameter of the cylindrical body.
[0009]
According to a third aspect of the present invention, in the first or second aspect , the cylindrical body is a spiral sheath tube. As a result, the tubular body is a thin-walled, lightweight, inexpensive, and easily available precast spiral sheath tube that is flexible and easy to handle, and retains its shape inside the mold and peels off the sheath tube and tube body. And the tube body can be easily inserted and removed. Thus, even when about 100 to 150 through-holes are formed in a concrete structure by a long-span precast segment method, the number of repeated reuses of the tube body is surely increased and the efficiency of the concrete placing work is improved.
[0010]
According to a fourth aspect of the present invention, in any one of the first to third aspects, the inner diameter of the opening of the cylindrical body located inside the mold opening is smaller than the inner diameter of the mold opening. Have Accordingly, the expanded tube body forms a through hole from the opening of the cylindrical body to the mold opening, and the through hole gradually expands in the opening direction. Thereby, since the opening part of the through-hole of an adjacent concrete structure is each large, it becomes prevention of the penetration defect of PC steel wire, a cable wire, etc. by the level | step difference produced between this opening part. Further, since one end of the tube body can be inserted into the opening of the existing concrete structure to newly adjoin the formwork, the manufacture of the concrete structure having a through hole in a place where there is no work gap is possible. It becomes possible.
[0011]
According to a fifth aspect of the present invention, there is provided a method for producing a through hole in a concrete structure using the apparatus according to any one of the first to fourth aspects, wherein both ends of the apparatus are installed on the predetermined formwork opening to inject fluid. And the step of forming the device by pressurizing and expanding the tube body and bringing it into intimate contact with the inner peripheral surface of the cylindrical body, and holding the device until the concrete material is poured into the mold and solidified, The tube body is contracted and removed by discharging the fluid, thereby forming the cylindrical body as the hole forming body, thereby preventing deformation of the hole forming body. Have By doing so, the above-described problems can be solved as in the inventions of the first to fourth aspects.
[0012]
According to a sixth aspect of the present invention, in the method for producing a through hole in a concrete structure using the apparatus according to any one of the first to fourth aspects, both ends of the apparatus are installed in the predetermined formwork opening to inject fluid. And forming the device by pressurizing and expanding the tube body and bringing it into close contact with the inner peripheral surfaces of the cylindrical body and the mold opening, and until the concrete material is poured into the mold and solidified. And holding the device, and then shrinking and removing the tube body by discharging the fluid, thereby forming the cylindrical body as the formation body of the hole, thereby forming a gap between the device and the formwork opening. Means for preventing the leakage of dew from the concrete material. In this way, it is possible to solve the same problems described above with the invention of claims 1 to 4, wherein.
[0013]
According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the apparatus according to the fourth aspect is provided, wherein the through hole is gradually expanded in the opening direction. In this way, the above-described problem can be solved as in the fourth aspect of the invention.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The tube body may be made of rubber or flexible resin having a thickness of 4 to 10 mm and capable of expanding and contracting. Depending on the applied pressure, a rubber hose in which reinforcing fibers are housed in a spiral shape is particularly effective. Metal fittings that can be pressurized and sealed are attached to both ends of the tube body, a pipe with an air supply / exhaust valve is attached to the metal fitting on one end side, and a sealing plug is provided on the metal fitting on the other end side. Moreover, it can replace with a sealing stopper and can be set as a hose coupling metal fitting. In addition to the valve, the pipe may be provided with a pressure gauge or an adjustment valve as necessary.
[0015]
The cylindrical body is made of a flexible steel plate, aluminum, hard corrugated cardboard, hard resin, etc., all having a thickness of 0.3 to 5 mm, and the shape thereof is a triangle, square, It has a required shape such as a circle or an ellipse, and the strength of the shape may be such that the shape can be maintained to such an extent that the tube body can be easily inserted. The cylindrical body may be removed from the molded through-hole, but preferably it is a thin, lightweight, inexpensive, flexible, shape-retaining, easily available, and precast spiral that can also be used on the peripheral wall of the hole A sheath tube is effective.
[0016]
In particular, the length of the cylindrical body only needs to be such that the positions of both openings of the cylindrical body are respectively located inside the openings of both molds. Preferably, when the positions are about 50 to 100 mm each from the opening of the formwork, it is good for ensuring straightness of the through hole.
[0017]
Furthermore, when the positions of both openings of the cylindrical body are about 50 to 100 mm from the openings of both molds and the diameter of the cylindrical body is about 10 to 20 mm smaller than the diameter of the mold openings, the through holes are formed. It is easy to gradually increase the diameter in the opening direction.
[0018]
When both spans are long spans, the length of the device can be increased by connecting multiple cylindrical bodies in series, and if necessary, connecting the tube bodies in series using hose fittings as well. Easy to do.
[0019]
When manufacturing a concrete structure having a through-hole, the step of forming a device for preventing deformation of the cylindrical body that forms the hole is an apparatus constituted by a cylindrical body that is sheathed on a tube body. each end portions of the opening of the pair of molds to face each other with a predetermined distance, is the tube body holding, the tube body is close contact expanded pressure to the inner peripheral surface of the opening. Next, in the step of forming the hole, the concrete material is poured and solidified in the mold. If necessary, the shape of the apparatus is maintained by a pressure gauge or a regulating valve, and after solidifying the concrete, the fluid is discharged and the tube body is reduced in diameter and removed.
[0020]
In particular, means for preventing leakage of concrete material from the opening of the formwork, means for gradually increasing the diameter of the through hole in the direction of the opening, and means for eliminating the work of finishing the opening of the through hole are provided on both sides of the cylindrical body. The tubular body described above, each having an opening positioned inside the mold opening, is externally mounted on a tube body, the tube body is installed on both mold opening, the tube body is pressurized and expanded, and the mold opening In addition, the tube bodies are held in close contact with the inner peripheral surfaces of the cylindrical bodies, and the tube bodies are held in both mold frame openings.
[0021]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a concrete structure in which through-holes are gradually enlarged in the opening direction. For forming through-holes in which a tube body 3 with a cylindrical body 2 is held in openings 41 and 42 of a pair of both molds. A side view is shown, including a cross-sectional view of the upper half of the device 1 in the longitudinal direction. The apertures 41 and 42 have a diameter of 90 mm. FIG. 2 which is a reference example shows the longitudinal direction of the through-hole forming apparatus 1 when the tubular body 2 sheathed on the tube body 3 is held in the opening 42 and the tube body 3 is held in the opening 41 facing each other. A side view including a half-sectional view is shown. FIG. 3 is a cross-sectional view of the upper half of the tube body 3 in the length direction. FIG. 4 is a radial cross-sectional view of the through-hole forming apparatus 1 in which a cylindrical tube body 3 expands and expands into a square cylindrical body 2. FIG. 5 is a front view for explaining the use of the concrete structure 6 having a width of 33 m and a length of 5 m by the precast segment construction method. Dozens of 90 mmφ openings 5 are illustrated as through holes into which PC steel wires, cable wires and the like are inserted.
[0022]
The cylindrical body 2 in FIG. 1 is a precast spiral sheath tube having a thickness of 0.3 mm, a diameter of 80 mmφ, and a length of 4.9 m.
[0023]
3 is a rubber hose with a thickness of 6 mm, an outer diameter of 68 mmφ, a length of 6.25 m, and metal fittings 31 and 32 at both ends. When the pressure is 0 kg / cm ² and the pressure is 2.0 kg / cm ² , the outer diameter can be 92 mmφ. The tube body 3 can be folded as shown in FIG. The metal fitting 31 includes a pipe 33 with a supply / exhaust valve (not shown), and the metal fitting 32 includes a sealing plug (not shown).
[0024]
The step of forming the device 1 of the through hole manufacturing method according to FIG. 1 is carried out by covering the tube body 3 so that both openings of the cylindrical body 2 are located inside the mold opening 41 and 42, respectively. Is installed in both mold opening 41 and 42. Next, 2 kg / cm ² of pressurized air is injected through the pipe 33 to pressurize and expand the tube body 3 so that the tube body 3 is brought into close contact with the inner peripheral surfaces of the both mold openings 41 and 42 and the cylindrical body 2. Is held in both mold openings 41 and 42 to form the apparatus 1.
[0025]
In the step of forming the hole-forming body, the concrete material is injected into the inside of the mold 4 and solidified, and then the air is discharged and the tube body 3 is contracted and removed, whereby the cylindrical body 2 is formed with the hole-forming body. Become.
[0026]
The deformation preventing effect of the cylindrical body 2 by the method of examples, the cylindrical body 2 an exterior tubing member 3 to 2.0 kg / cm ² performs air pressurization of the total length 200 mm, compressing the entire length of the tubular body After the pressure was gradually increased to 204 kg / cm ² in the radial direction with a testing machine, the pressure was released, and no deformation was visually observed in the diameter of the tubular body 2 after the tube body was removed.
[0027]
[Action and effect of the invention]
As described above in detail, the apparatus for forming a large number of through holes and a method for manufacturing the through holes in a concrete structure having a long span in particular and the method for manufacturing the through holes are extremely easy to handle because the tube body is lightweight and can be folded. It becomes easy. Furthermore, since the flexible tube body that has been pressurized and expanded is integrated with the cylindrical body having a predetermined shape, it functions as a rigid reinforcing body, and thus prevents deformation of the cylindrical body as the hole forming body. . In particular, when an elastic tube body made of rubber that is pressurized and expanded is held in the opening of the formwork, the function is remarkable as an effect of preventing leakage of concrete material and preventing the leakage of the concrete material.
[0028]
In addition, the precast spiral sheath tube, which is thin, lightweight, and inexpensive, is flexible, so it is easy to handle, has good shape retention, and is easy to peel off from the tube body. And the durability of the tube body is improved. Further, when the positions of both openings of the cylindrical body as the formation body of the hole are located inside each opening between the two mold openings, the finishing operation of the opening portions at both ends of the through hole is eliminated. Furthermore, the through holes can be gradually expanded in the opening direction by means of an apparatus in which the inner diameter of the cylindrical body is smaller than the inner diameters of both mold opening.
[Brief description of the drawings]
FIG. 1 is a side view including a longitudinal sectional view of an apparatus in which a tube body according to the present embodiment is held in both mold frame openings.
FIG. 2 is a side view including a longitudinal sectional view of the apparatus in a case where the cylindrical body of the present reference example is held in one mold opening and the tube is held in an opposing mold opening.
FIG. 3 is an upper half cross-sectional view in the length direction of the tube body of the present embodiment.
FIG. 4 is a radial cross-sectional view of the apparatus when a tube-shaped tubular body is packaged.
FIG. 5 is a front view illustrating the use of a concrete structure by a precast segment method.
FIG. 6 is a schematic view in which the tube body of the present embodiment is folded and stored.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Apparatus 2 Cylindrical body 3 Tube body 31, 32 Metal fitting of both ends of tube body 4 Formwork 41, 42 Opening part of formwork 5 Opening part of through-hole

Claims (7)

  In a through-hole forming apparatus used when manufacturing a concrete structure having a through-hole, the apparatus includes a flexible tube body that can be expanded and contracted by entering and exiting a fluid, When both ends of the apparatus are held in openings of a pair of molds facing each other at a predetermined interval, the both ends of the apparatus are formed as a formed body. An apparatus for forming a through-hole in a concrete structure, wherein the portion is the tube body, and both openings of the cylindrical body of the apparatus are located inside the formwork openings. The apparatus for forming a through hole in a concrete structure according to claim 1, wherein the tube body is a rubber hose. 3. A through-hole forming apparatus for a concrete structure according to claim 1, wherein the cylindrical body is a spiral sheath tube. In claims 1 to 3, the through-hole forming device of concrete structures, wherein the inside diameter of the opening of the tubular body located inside between the mold opening is smaller than the inner diameter of the mold opening . In the through-hole manufacturing process of claims 1 to 4 concrete structure using the apparatus described, the both ends of the device and bridged predetermined the mold opening, the pressure inflating the tube body in the injection of fluid A step of forming the device by tightly contacting the inner peripheral surface of the cylindrical body, and holding the device until the concrete material is poured into the mold and solidifying, and then the tube body is discharged by discharging the fluid. A method for producing a through hole for a concrete structure, comprising: forming a cylindrical body by shrinking and removing the cylindrical body to prevent deformation of the hole forming body. In the through-hole manufacturing process of claims 1 to 4 concrete structure using the apparatus described, the both ends of the device and bridged predetermined the mold opening, the pressure inflating the tube body in the injection of fluid A step of forming the apparatus by closely contacting each inner surface of the cylindrical body and the opening of the mold, and holding the apparatus until the concrete material is injected into the mold and solidified, and then the fluid The tube body is shrunk and removed by discharging, and the cylindrical body is formed into the hole forming body, thereby preventing the leakage of the concrete material from the gap between the apparatus and the mold opening. A method for producing a through-hole in a concrete structure, characterized by comprising: 7. The method of manufacturing a through hole for a concrete structure according to claim 6, wherein the through hole is gradually enlarged in the opening direction by using the apparatus according to claim 4 .

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