JP5717437B2 - Grout pouring hole forming form - Google Patents

Description

  The present invention relates to a grout injection hole forming form for forming a grout injection (discharge) hole in a sleeve joint of a precast concrete structure used when a large structure made of reinforced concrete is constructed.

  In general, when constructing a reinforced concrete structure, a sleeve joint is used to connect long main reinforcing bars, and the reinforcing bars inserted from the openings at both ends of the sleeve joint are made of a grout such as high-fluidity non-shrink mortar. Injecting and connecting by grout solidification is performed. The grout is injected from the grout injection hole provided on one side of the sleeve joint toward the grout discharge port provided on the other side, but the work of injecting grout into dozens of sleeve joints at the construction site is heavy, Significantly affects the progress of construction.

  For example, a precast reinforced concrete structure used for walls, columns, etc. has a plurality of reinforcing bars connected to the upper ends of a plurality of sleeve joints, and the lower ends of the sleeve joints are configured to open to the bottom surface of the concrete structure. ing. The sleeve joint has a grout inlet formed at the lower end, a grout outlet formed at the upper end, and a size having a gap for filling the grout between the inserted reinforcing bars. Is formed.

  A grout injection (discharge) port of the sleeve joint communicates with a side surface of the precast reinforced concrete structure. The method of forming a communication hole that connects the grout inlet (discharge) port to the side surface of the precast reinforced concrete structure is a method of embedding a pipe pipe such as a PVC pipe or a tube body that expands and contracts by supplying and discharging fluid. There is a method used as a frame. Examples of a method for forming a grout injection (discharge) port using the tube body as a mold include a method for forming a grout pouring port forming tube mold and a reinforced concrete member disclosed in Japanese Patent Application Laid-Open No. 2008-231679.

  Since the tube form for forming a grout inlet / outlet described in the above publication is extracted after the concrete is hardened, the strength of the concrete does not decrease, and can be diverted to construction of other concrete members. Further, since the tube body has flexibility, there is an advantage that it is easy to form a grout pouring port inside the concrete member.

JP 2008-231679 A

However, the grout pouring port forming tube form described in the above publication has the following problems because it is a tube body that expands and contracts by supply and discharge of fluid.
<1> It is necessary to control the pressurization of the tube body.
<2> A reduced diameter portion is formed at one end of the tube body to connect to the inlet (discharge) port of the sleeve joint, and a check valve is provided at the other end to inject fluid and maintain pressure. Joint parts are required.
<3> Since the tube body expands by injecting fluid, after setting the tube body, check the pressurized state before placing concrete, and if the pressurized state is sweetened, I need to change my body.
<4> When the tube body is made of soft vinyl chloride, which is a material that does not easily adhere to concrete and is easy to peel off, it must be carefully taken because it is vulnerable to fire.
<5> A pump for injecting and discharging fluid to and from the tube body is required, and the work of injecting and discharging fluid to a large number of tubes becomes enormous. I need it.

  The present invention has been made in view of the present situation, and has a grout injection hole forming form that is easy to handle and excellent in workability, and that can form grout injection (discharge) holes of a predetermined shape. The purpose is to provide. Another object of the present invention is to provide a grout pouring hole forming form that can be used repeatedly and that is easy to manage without using an instrument or apparatus.

A grout pouring hole forming mold according to the present invention is a grout pouring hole forming mold communicated with a sleeve joint of a precast concrete structure, and is inserted into the pipe body that expands and contracts and the pipe body. , Ri Do from the mold core material having a larger outer diameter than the inner diameter of the pipe, that the one side of the outer peripheral surface of the inner peripheral surface or the mold core material of the pipe body was formed in an uneven shape Features. By forming the concavo-convex shape, the mold core can be easily pulled out.

  The uneven shape of the pipe body peripheral surface or the mold core outer peripheral surface may be any shape that allows a gap to be partially formed between the pipe body and the mold core material, for example, a large number of longitudinal depressions provided in the axial direction. It can be formed by a groove. The mold core material may be rigid or flexible, as long as it can hold a predetermined shape even when pressure is applied during concrete pouring. . In addition, when the tip of the mold core is formed in the insertion part having the same diameter as the grout injection port of the sleeve joint, the main part of the mold core and the insertion part are formed in the same size. can do.

According to the present invention, the following effects can be obtained by configuring the grout pouring hole forming mold with the pipe body having a simple structure and the mold core material inserted into the pipe body.
(1) It is expanded by inserting the core material for the mold into the pipe body, and it is contracted by pulling out the core material for the mold, so that it is easy to assemble and efficiently attach to and remove from the concrete body. It can be carried out.
(2) It can be used repeatedly.
(3) Assembly and separation of the grout pouring hole forming mold can be performed manually without the need for other devices and jigs.
(4) By inserting the insertion part of the core material for the mold into the inlet / outlet of the sleeve joint, it does not fall off even when placing concrete.
(5) In the case where the pipe body and the mold core are made of a flexible material, the pipe body and the mold core material can also be formed by a curved injection (discharge) hole.

It is a perspective view for description of the grout pouring hole forming form concerning this invention. It is sectional drawing of the pipe body which comprises a formwork. It is sectional drawing which inserted the core material for type | molds into the pipe body. It is a transverse cross section of the state where the formwork concerning this invention was attached to the precast concrete structure. It is a partial expanded longitudinal section similarly. It is a partial cross section figure of the precast concrete structure in which the grout pouring hole was formed. It is a longitudinal cross-sectional view which shows 2nd Embodiment of a pipe body. It is sectional drawing of the state which inserted the core material for molds of other embodiment in the pipe body. FIG. 9A shows a method for fixing a grout pouring hole forming mold according to the present invention to a concrete mold, FIG. 9A is a cross-sectional view when pressing and fixing with a concrete mold, and FIG. 9B is a concrete mold. FIG. 9C is a cross-sectional view when screwing from the outside of the concrete formwork. It is sectional drawing in the case of curving and fixing a grout pouring hole formation formwork to a concrete formwork.

  Hereinafter, an embodiment illustrating a grout pouring hole forming mold according to the present invention will be described. As shown in FIG. 1, the grout pouring hole forming mold 1 includes a pipe body 10 and a mold core 20 inserted into the pipe body 10.

The pipe body 10 is a hollow pipe that is connected to an injection (discharge) port of a sleeve joint embedded in a precast concrete structure and forms a grout injection / discharge hole, and is formed of an elastic material that can expand and contract. Has been. Both ends of the pipe body 10 are opened, and expand by inserting the mold core 20 from one end, and contract by pulling out the inserted mold core 20 .

  The material of the pipe body 10 is not particularly limited as long as it can expand and contract, but it is preferably formed of rubber having excellent heat resistance and oil resistance, such as acrylonitrile butadiene rubber (NBR), fluorine rubber, and the like. The inner peripheral surface of the pipe body 10 is formed in a concavo-convex shape, and in the illustrated embodiment, a number of vertical concave grooves 11 are formed in the inner surface axial direction. Due to the vertical groove 11, the inner peripheral surface of the pipe body 10 is not in close contact with the outer peripheral surface of the inserted mold core member 20, and as shown in FIG. Will be formed. Since the grease applied to the outer peripheral surface of the mold core material 20 enters the gap formed by the vertical groove 11, the grease in the vertical groove 11 is removed when the mold core material 20 is slightly rotated during extraction. Can be pulled out easily.

  The pipe body 10 can be formed of rubber alone, but the pipe body expands and is configured by braiding fibers such as synthetic fibers at a certain angle with respect to the axial direction so as to have flexibility. be able to. When the pipe body 10 is used, it is preferable to apply a release agent to the outer peripheral surface in order to facilitate separation from the concrete.

  The mold core material 20 constituting the grout pouring hole forming mold 1 is a solid (solid) rod-shaped body as long as it has a certain hardness that is not crushed by pressurization during concrete pouring. Or a hollow pipe. The mold core 20 can be formed of a single material such as rubber or resin, or can be formed of a composite material having a reinforcing layer therein. The outer diameter of the mold core 20 is larger than the inner diameter of the pipe body 10, and is formed so as to expand the pipe body when inserted into the pipe body 10.

  The mold core 20 includes a main body portion 21 and an insertion portion 22 to be inserted into an injection (discharge) port of the sleeve joint, and the insertion portion 22 serves as a distal end portion on the side to be inserted into the pipe body 10. The insertion portion 22 is provided with a mark 23 indicating the insertion length to be inserted into the injection (discharge) port of the sleeve joint, so that the distal end portion of the insertion portion 21 can be easily inserted into the pipe body 10. A taper 24 is formed. Instead of the mark 23, the entire insertion portion 22 may be colored or provided with a pattern. In the illustrated embodiment, the main body portion 21 and the insertion portion 22 are formed to have the same diameter and the same shape.

  When inserting the mold core 20 into the pipe body 10, it is preferable to apply grease to the outer periphery of the mold core 20 and insert it so that the mold core 20 can be easily pulled out after the concrete is solidified. The grease applied to the outer periphery of the mold core 20 enters the longitudinally recessed groove 11 formed on the inner surface of the pipe body 10 when inserted. Therefore, when the mold core 20 is pulled out, it can be easily rotated. Can be pulled out. Moreover, when it is set as the core material 20 which has flexibility instead of a rigid rod-shaped body, even if it is long, it can be rotated in the curved state.

  In the embodiment shown in the figure, the concave and convex shape is formed by forming the vertical groove 11 on the inner peripheral surface of the pipe body 10, but when the pipe body 10 is short (for example, the length dimension is 20 to 40 cm), The uneven shape can be omitted. Moreover, the uneven shape of the inner peripheral surface of the pipe body 10 may be omitted, and the uneven shape may be formed on the outer peripheral surface of the mold core 20. The concave / convex shape of the outer peripheral surface of the mold core 20 can be formed by vertical concave grooves in the same manner as the inner peripheral surface of the pipe body 10.

  The material of the mold core 20 may be rigid or flexible, and is not particularly limited. However, in the case of a relatively long length (for example, a length dimension of 50 cm or more), It is preferable to have flexibility as long as it can maintain a predetermined shape even when pressure is applied when placing concrete. In the case of the mold core material having flexibility, it can be attached in a curved state and can be pulled out after the concrete is solidified.

  Next, the formation method of the grout pouring hole in the precast concrete structure using the said formwork 1 is demonstrated. FIG. 4 shows the assembled state of the sleeve joint 30 and the grout pouring hole forming form 1 before forming the precast concrete structure. A main rebar 31 is fixed to the upper portion of the sleeve joint 30, and the sleeve joint 30 is fixed to a rebar 32 arranged horizontally.

  The grout injection hole forming mold 1 is attached to the grout injection port 33 ((discharge port 33a) of the sleeve joint 30 to which the main reinforcing bar 31 is fixed. The mold core 20 is inserted into the pipe body 10 and assembled so that the insertion portion 22 at the tip projects from the mark 23. The assembly of the grout pouring hole forming mold 1 is performed by the pipe. Since the mold core 20 is simply inserted into the body 10, it can be assembled very easily.At this time, in order to make it easy to pull out the mold core 20 after the concrete is solidified, the outer periphery of the mold core 20 is greased. It is preferable to apply and insert.

  Further, the grout pouring hole forming form 1 may be stored in an assembled state or in a separated state before assembling. As shown in FIG. 5, the grout pouring hole forming mold 1 is attached by inserting and inserting the insertion portion 22 into the injection (discharge) port 33 (33 a) of the sleeve joint 30.

  The insertion portion 22 of the mold core 20 has a tapered tip, so that it can be easily inserted into the injection (discharge) port 33 (33a) and can be reliably inserted into the mark 23. The tip end surface of the pipe body 10 comes into contact with the injection port 33 ((discharge port 33a) of the sleeve joint 30. The mold core member 20 is made of a flexible material. If it is not necessarily straight, it can be easily inserted into the inlet 33 ((discharge port 33a) of the sleeve joint 30 and can be easily bent by being arranged in accordance with the arrangement of the sleeve joint 30. Can work.

  Next, when the installation of the grout pouring hole forming mold 1 is completed, the concrete may be placed in the concrete mold 35. At this time, in order to facilitate peeling after the concrete is solidified, it is preferable to apply a release material to the outer peripheral surface of the pipe body 10. The release material may be applied to the outer peripheral surface of the pipe body 10 before the grout pouring hole forming mold 1 is inserted into the inlet 33 ((the outlet 33a) of the sleeve joint 30. The finished concrete is cured and solidified for a predetermined period.

  Next, after the concrete is solidified, the grout pouring hole forming mold 1 is removed from the injection port 33 ((discharging port 33a) of the sleeve joint 30. The grout pouring hole forming mold 1 is removed by the mold core 20. When the vertical groove 11 is formed on the inner peripheral surface of the pipe body, it can enter into the vertical groove 11 on the inner peripheral surface of the pipe body 10. When the core material 20 is pulled out, the pipe body 10 remaining in the concrete structure is peeled off from the concrete by contracting to the original size, and can be taken out as it is. When the pipe body 10 is taken out, a grout injection hole 36 and a grout discharge hole 36a are formed as shown in FIG.

  FIG. 7 shows another embodiment of the concavo-convex shape of the inner peripheral surface of the pipe body 10. The pipe body 10A shown in FIG. 7A has an inner peripheral surface shape formed by projecting a large number of projections 12, and the pipe body 10B shown in FIG. 7B projects the band-like projections 13 in a spiral shape. The inner peripheral surface shape is shown. 7A and 7B, as in the first embodiment shown in FIGS. 1 to 3, the contact area with the outer peripheral surface of the mold core 20 may be reduced and tightly contacted. In addition, since the applied grease enters the gap, it can be easily pulled out by only slightly rotating the core material. In addition, the uneven shape of the inner peripheral surface of the pipe body 10 is. It is not limited to the said embodiment, What is necessary is just to form a space | gap, without the pipe body 10 and the core material 20 for mold | die partly adhering partially.

  FIG. 8 shows another embodiment of the mold core 20. In the embodiment shown in FIGS. 1 to 3, the insertion portion 22 of the mold core 20 and the sleeve joint inlet 33 ((discharge outlet 33 a) are formed in the same size, but the embodiment shown in FIG. 8. The mold core material 20A has an outer diameter that is large enough to fit the distal end portion (insertion portion) of the mold core material 20 into the inlet 33 ((discharge port 33a) of the sleeve joint integrally with the pipe body 10. In the case of this embodiment, if the outer diameter of the pipe body 10 expanded by inserting the mold core material 20 becomes substantially the same as the inner diameter of the inlet 33 ((discharge outlet 33a) of the sleeve joint. In order to insert into the inlet 33 ((discharge port 33a) of the sleeve joint, first, only the tip of the pipe body 10 is inserted, and then the tip of the mold core member 20 is inserted into the inlet 33 ( What is necessary is just to push in (discharge port 33a).

  In this case, the distal end portion of the pipe body 10 is sandwiched between the injection port 33 ((discharge port 33a) and the mold core member 20, and can be securely inserted into the mold body of the first embodiment. Compared to the core material, the outer diameter of the main body is reduced, and the grout injection hole 36 and the grout discharge hole 36a can be made smaller accordingly, so that the grout filling amount can be reduced.

  In addition, like the said 2nd Embodiment, the insertion part of a core material for a mold is abbreviate | omitted, and it assembles so that the end surface of a pipe body and the end surface of the core material for a mold inserted in the said pipe body may become the same surface. Can do. Even when the tip of the pipe body and the tip of the mold core are integrally inserted, the end of the mold core is preferably tapered.

  FIG. 9 and subsequent figures show a method of fixing the rear end portion of the grout pouring hole forming mold 1 according to the present invention to a concrete mold. FIG. 9A shows a screw hole 37 provided at the rear end of the mold 1, that is, the end fixed to the concrete mold 35, and the concrete mold 35 is pressed so as to close the screw hole 37. And fix. The screw hole 37 is used for screwing a male screw of a jig for pulling out the mold core member 20. By screwing a drawing jig (not shown), it can be easily pulled out by connecting to the rear end surface of the mold core 20.

  9B, similarly to FIG. 9A, a screw hole 37 is provided at the rear end of the mold 1 and a T-shaped packing 38 having a protrusion to be inserted into the screw hole 37 is attached. The concrete mold 35 is pressed and fixed to the T-shaped packing. The T-shaped packing 38 can be formed of an elastic material such as rubber or resin, and can be reused. After removing the concrete formwork 35, the T-shaped packing 38 is taken out from the screw hole 37, and a drawing jig is attached to the screw hole 37 in the same manner as in FIG. Just pull out from.

  In FIG. 9C, the bolt 40 is inserted into the through hole 39 formed in the concrete mold 35 and the bolt 40 is screwed into the screw hole 37 to be fixed to the concrete mold 35. Also in this fixing method, as in FIG. 9B, after removing the concrete mold 35, a drawing jig is attached to the screw hole 37 and the mold core 20 is pulled out from the pipe body 10.

  FIG. 10 shows a method in which the grout pouring hole forming mold 1 is installed in a curved shape or a relatively long mold 1 is fixed to a concrete mold. As shown in the figure, when installing in a curved manner, it is difficult to press and fix the rear end surface with a concrete mold as shown in FIG. 9, so the rear end of the mold 1 is drilled in the concrete mold 35. It was made to fix by inserting in the provided through-hole 41. FIG. In the case of this fixing method, a screw hole 37 may be provided on the rear end surface of the mold core material. However, the rear end portion of the mold core material is protruded from the pipe body 10, and the protruding portion is gripped. You may make it pull out from the pipe body 10, rotating.

1: Grout pouring hole forming mold 10: Pipe body 11: Vertical groove 20: Mold core 21: Main body part 22: Insertion part 23: Mark 30: Sleeve joint 31: Main reinforcing bar 32: Arranged Reinforcing bar 33: injection port 33a: discharge port

Claims (3)

A grout pouring hole forming mold that communicates with a sleeve joint of a precast concrete structure, for a pipe body that expands and contracts, and a mold that is inserted into the pipe body and has an outer diameter larger than the inner diameter of the pipe body Ri Do and a core, the inner peripheral surface or grout Note exhaust hole forming mold frame either side of the outer peripheral surface, characterized in that formed on the concavo-convex shape of the mold for the core material of the pipe body. 2. The grout pouring hole forming form according to claim 1, wherein the concave and convex shape of the pipe inner peripheral surface or the mold core outer peripheral surface is formed by a number of longitudinal concave grooves provided in the axial direction. . The mold core for forming grout pouring holes according to claim 1 or 2 , wherein the mold core material is flexible .

Images