JP5443193B2 - Lattice body manufacturing method and concrete body construction method - Google Patents

Description

The present invention mainly relates to a method for manufacturing a lattice body embedded in a surface layer portion of a concrete body in order to prevent peeling of the surface layer portion of the concrete body , and a method for constructing the concrete body using the lattice body.

  Patent Document 1 discloses that a net-like concrete reinforcing material is previously embedded near the surface of the lining concrete in order to prevent the lining concrete of the tunnel from being peeled off. Further, Patent Document 2 has a proposal regarding a construction technique in the case where a grid-like or mesh-like fiber reinforced sheet is embedded in lining concrete.

Japanese Patent No. 3604315 JP 2009-138516 A

Although it is considered that the lining concrete peeling prevention technology by the concrete reinforcing material and the fiber reinforced sheet shown in Patent Literature 1 and Patent Literature 2 is basically effective, the following problems to be solved remain.
That is, in Patent Document 1, since the mesh body is manufactured, the adhesive is impregnated and the granular body is bonded, so that it takes time to manufacture. Moreover, although the adhered granular material ensures isolation from the mold, adjustment of the isolation is difficult. And in patent document 2, there exists a possibility that it may expose to the concrete surface and we are anxious about deterioration of a reinforcing material.
Furthermore, neither the concrete reinforcing material shown in Patent Document 1 nor the fiber reinforcing sheet shown in Patent Document 2 can be manufactured easily and inexpensively. Therefore, it takes time and effort, so the influence on construction cost and construction period cannot be ignored.

  In view of the above, it is necessary and effective to improve the above points in order to promote the spread of lining concrete as a truly effective technique using concrete reinforcing materials and fiber reinforced sheets of this type. In fact, improvement measures are being sought.

In view of the above circumstances, the present invention mainly provides an effective and appropriate manufacturing method for manufacturing an effective and appropriate lattice body that can prevent the surface layer portion of the concrete body from peeling off, and a method for constructing a concrete body using the lattice body. The purpose is to provide an effective and appropriate construction method.

The invention according to claim 1 manufactures a lattice body in which linear bodies intersect and are formed in a lattice shape, and an intersection coupling body projecting in an out-of-plane direction is provided at an intersecting portion of the linear bodies. And a jig having a vertical and horizontal groove for cross-disposing linear bodies in two directions and a recess for forming the cross-joint at the intersection of grooves in each direction. Used, the two-directional linear bodies were respectively arranged in the grooves, and the cross-joints in a fluid state were filled in the recesses and hardened to protrude the cross-joints in the out-of-plane direction. It is characterized in that it is formed in a state and linear bodies in two directions are coupled to each other by the intersection coupling body.

According to a second aspect of the present invention, there is provided a surface layer portion of a lattice body in which a linear body intersects and is formed in a lattice shape, and an intersection coupling body protruding in an out-of-plane direction is provided at an intersecting portion of the linear bodies. A method for constructing a concrete body embedded in a concrete body, wherein the lattice body is mounted on an inner surface of a mold for forming the concrete body in a state in which a tip of an intersection joint is in contact with the inner surface of the mold After that, the concrete is embedded in the surface layer of the concrete body by placing concrete in the formwork.

According to a third aspect of the invention, a method of constructing concrete bodies of the invention of claim 2, wherein the mounting of the grid with respect to the mold inner surface, double-sided adhesive tape adhered to the grid body to the mold inner surface It was made to contact | abut to the said inner surface of a formwork through.

A fourth aspect of the invention is a concrete body construction method according to the second or third aspect of the invention, in which the lattice body is attached to the inner surface of the formwork, and the lattice body is temporarily attached to the inner surface of the formwork. It is performed by temporarily fastening with a fastening member

According to a fifth aspect of the present invention, there is provided a surface layer portion of a lattice body in which a linear body intersects and is formed in a lattice shape, and an intersection coupling body protruding in an out-of-plane direction is provided at an intersecting portion of the linear bodies. A method for constructing a concrete body embedded in a concrete body, wherein a bracket is fixed to an end surface of an adjacent concrete body that has already been constructed, and the lattice body is supported by the bracket, and the surface layer of the concrete body to be constructed in the next stage After placing the formwork outside the lattice body and bringing the inner surface of the formwork into contact with the tip of the intersection of the lattice bodies, the concrete is cast into the formwork. By installing, the lattice body is embedded in the surface layer portion of the concrete body.

According to the method of manufacturing a lattice body of the present invention, the lattice is formed by intersecting linear bodies so as to form a lattice, and at the intersecting portions of the linear bodies, the intersection coupling body protruding in the out-of-plane direction is provided. The body can be manufactured easily and at a sufficiently low cost, and a sufficient cost reduction can be realized as compared with conventional concrete reinforcing materials and fiber reinforced sheets.

According to the concrete body construction method of the present invention, when the concrete body is constructed, the cross-section joined body is formed in a lattice shape by intersecting the linear bodies and protrudes in the out-of-plane direction at the intersection of the linear bodies. by attaching a mold inner surface being in contact with the tip portion of the cross-section conjugate grid made provided a mold inner surface, or from the end of the construction already concrete bodies supported by a bracket arrangement By doing so, it is possible to easily position the lattice body at an appropriate position, and it is possible to efficiently perform the construction of the concrete body.
In addition, when the lattice body is embedded in the concrete body, the cross-section joined body for connecting the linear bodies intersecting in both the vertical and horizontal directions is a spacer for defining the embedding depth in the concrete body. Therefore, when installing a concrete body, it can be easily attached to the formwork and positioned, and can be reliably embedded in the surface layer of the concrete body. Can be reliably prevented.

It is a figure which shows embodiment of the lattice body of this invention. It is a figure which shows embodiment of the manufacturing method of the lattice body of this invention. It is a figure which shows the concrete body which embed | buried the lattice body of this invention in the surface layer part. It is a figure which shows embodiment of the construction method of the concrete body of this invention. It is a figure which shows other embodiment of the construction method of the concrete body of this invention. It is a figure which shows the example of the temporary fixing member used in the construction method of the concrete body of this invention. It is a figure which shows the other example of a temporary fixing member equally. It is a figure which shows the further another example of a temporary fixing member equally. It is a figure which shows other embodiment of the construction method of the concrete body of this invention. It is a figure which shows other embodiment of the construction method of the concrete body of this invention.

An embodiment of the lattice of the present invention is shown in FIG.
The grid body 1 of the present embodiment is for preventing peeling of the surface layer portion of the tunnel lining concrete, and is formed by crossing the linear bodies 2 excellent in tensile strength vertically and horizontally to form intersections between them. By connecting the linear bodies 2 in both directions in a lattice shape by the body 3, and forming the intersection joint 3 in a state of projecting in one out-of-plane direction (the lower surface side in FIG. 1) of the lattice body 1. And the intersection coupling | bond_body 3 functions as a spacer and can prescribe | regulate the embedment position to the surface layer part of lining concrete naturally.

As a raw material of the linear body 2, metal fibers and various high-strength non-metallic fibers are used as in the conventional concrete reinforcing material shown in Patent Document 1 and the conventional fiber reinforcing sheet shown in Patent Document 2. (Glass fiber, aramid fiber, vinylon fiber, polyethylene fiber, etc.) can be used, and PET (polyethylene terephthalate) resin, which is a thermoplastic resin, is particularly suitable. Recycled PET resin is more preferable than newly produced PET. It is preferable because less energy is required for production, that is, it can contribute to reducing the environmental load by reducing CO ₂ emissions.
The wire diameter of the linear body 2 may be set as appropriate so as to obtain a desired strength according to the material, but any material can obtain a sufficient strength at 1 mmφ or less. The grid shape of the grid of the grid body 1 is not limited to a square but may be an appropriate polygon, and the grid size may also be appropriate. In order to prevent the aggregate from peeling off in the lining concrete, it is about 20mm x 20mm. Then, it is preferable because a part of the coarse aggregate comes out of the mesh due to the relation with the size of the coarse aggregate, so that the layer separation is eliminated.

The shape and dimensions of the intersection joint 3 may be appropriately designed as long as the linear bodies 2 in both directions can be reliably joined and can function as a spacer. For example, the diameter is about 2 mm and the height is about several mm. In particular, the protrusion dimension s (see FIG. 1C) to be secured as a spacer may be optimally set within a range of about 1 to 5 mm. In short, it is only necessary that the mortar can be reliably filled between the lattice body 1 and the mold 7 described later.
The material of the intersection joint 3 may be appropriate, but a thermoplastic resin is suitable when a manufacturing process as will be described later is assumed, and a recycled PET resin is particularly suitable as in the case of the linear body 2.

FIG. 2 shows an embodiment of a method for manufacturing the lattice body 1 in the case where a thermoplastic resin is used as the intersection joint 3.
In this case, as shown to (a), it has the vertical and horizontal groove | channel 4a for cross-disposing the linear body 2 of both directions, and the recessed part 4b for forming the cross | intersection coupling body 3 in the cross | intersection part of the groove | channel 4a. A jig 4 having the same is used.
And after arrange | positioning the linear body 2 in the groove | channel 4a of both directions as shown in (b) at the crossing state, respectively, as shown in (c), the thermoplastic resin of a heat-melting state is filled into the recessed part 4b from the nozzle 5 as shown in (c). Then, by hardening and molding so as to surround the entire intersection by natural cooling or forced cooling, the linear bodies 2 in both directions are naturally joined in a lattice shape, and at the same time, the intersection joint 3 having a desired dimension as a spacer is formed. Is done.
In addition, the protrusion dimension of the cross | joint part coupling body 3 can change variously according to the kind use conditions etc. of the concrete body to embed. In the manufacturing method of the present invention, the projecting dimension of the intersection joint 3 can be changed by changing the depth of the recess 4 b of the jig 4. In this case, a plurality of jigs 4 having different depths of the recesses 4b may be manufactured and the jigs 4 themselves may be changed for each depth of the recesses 4b. The depth is adjusted by filling the bottom of the recess 4b with a filling material, or a mold with only the recess 4b having a different depth is manufactured separately, and the recess is opened in the jig 4. The depth may be adjusted by exchanging the recessed mold frame in a form that fits into the mold hole. In this way, the protruding dimension of the cross-coupled body 3 can be easily changed.

The lattice 1 having the above-described structure can be manufactured at a sufficiently low cost according to the above manufacturing process, and the cost can be sufficiently reduced as compared with the conventional concrete reinforcing materials and fiber reinforced sheets disclosed in Patent Documents 1 and 2. It can be realized.
In addition, since the intersection joint 3 for joining the linear bodies 2 in both directions functions as a spacer at the same time, it is possible to easily perform mounting work and positioning work on the formwork during construction of the lining concrete.

An embodiment of a construction method in the case of constructing tunnel lining concrete (concrete body) using the lattice body 1 will be described below.
As shown in FIG. 3, when the lining concrete 6 is handed over by one casting length (for example, about 10 m), each of the lattice bodies is in a certain width range (for example, a range of 50 cm) on both sides of the joint portion. 1 will be buried.

For this purpose, as shown in FIG. 4, a double-sided adhesive tape 8 is attached to the inner surface (concrete placement side) of a mold 7 (centre skin plate) for constructing the lining concrete 6, and the double-sided adhesive tape 8. The tip of the intersection joint 3 of the lattice body 1 bent along the shape of the joint is brought into contact with the joint. The wife form 9 on the face side may be bound by a binding wire 10 or fixed by a U-shaped stapler 10 ′.
In this way, the projecting-side tip of the intersection joint 3 of the grid body 1 is indirectly brought into contact with the double-sided adhesive tape 8 so that the mold frame 7 is disposed at a predetermined position, thereby positioning the grid body 1. Since the lining concrete 6 is placed and removed from the mold, and the double-sided adhesive tape 8 is peeled off, the grid 1 is protruded from the surface layer portion of the lining concrete 6 by the projected dimension of the intersection joint 3. It can be buried at a considerable depth.

Further, instead of or in addition to attaching the grid body 1 with the double-sided adhesive tape 8 as described above, the grid body 1 may be temporarily fixed to the inner surface of the mold 7 with an appropriate temporary fixing member. .
For example, as shown in FIG. 5 to FIG. 6, a small hole 7 a for passing the leg portion 11 b through the mold frame 7 is used by using a temporary fixing member 11 including a disc-shaped pressing plate 11 a and a leg portion 11 b by a leaf spring. It is conceivable that the temporary fastening member 11 is mounted in a state in which the tip of the protruding portion of the crossing joint 3 of the lattice body 1 is in contact with the inner surface of the mold 7. In this case, the holding plate 11a is embedded in the lining concrete 6 together with the grid body 1, but the leg portion 11b is removed by cutting after demolding or as shown in FIG. 6 (c). You may make it extract before 6 hardens | cures completely.

Alternatively, as shown in FIG. 7, a temporary fastening member 12 using bolts and nuts can also be suitably employed.
The temporary fastening member 12 includes a bolt 12a and a nut 12b having a flange portion and screwed into the bolt 12a. The outer diameter of the main body portion of the nut 12b is smaller than the size of the lattice mesh of the lattice body 1, and the size of the collar portion is larger than the size of the lattice mesh. A hole 7a that is larger than the bolt screw portion diameter and smaller than the nut main body portion outer diameter is formed in the mold frame 7, and the intersecting portion coupling body 3 of the lattice body 1 protrudes on the inner surface (concrete placement side) of the mold frame 7. It arrange | positions so that a front-end | tip may contact | abut. The bolt 12a that penetrates the hole 7a of the mold 7 and the main body portion of the nut 12b are screwed together through the main body portion of the nut 12b in the grid of the lattice body 1. By doing in this way, the lattice body 1 is temporarily fixed to the formwork 7 by the main body part and the collar part of the nut 12b. When the lining concrete 6 is placed, the bolts 12a are removed and the mold 7 is removed. The nut 12b is embedded in the lining concrete 6.

  Furthermore, as shown in FIG. 8, the lattice body 1 may be hooked on a pin 13 inserted into a recess formed on the inner surface of the mold 7 as a temporary fixing member. As the pin 13, one made of hard rubber or hard resin can be suitably employed, and after demolding, the base end of the pin 13 is exposed on the surface of the lining concrete 6 as shown in FIG. Just do it.

  In addition, the technique disclosed in Patent Document 2 can also be used. For example, the slits formed in the mold 7 can be fixed inside the mold 7 through the lattice 1, or can be a string such as a teg or a rope. It is also possible to arrange the lattice body 1 at an appropriate position with the tip of the intersection joint 3 being in contact with the inner surface of the mold 7 by fixing the wound around the mold 7 with the body. is there.

In addition, the grid body 1 is supported from the end surface of the lining concrete 6 that has already been applied to the end portion of the lining concrete 6 on the wellhead side.
That is, as shown in FIG. 9, after the inserts are driven at predetermined intervals in the end face length direction (circumferential direction) of the adjacent lining concrete 6 that has been installed, the lattice body 1 positioned on the end face is joined to the intersection joint body. 3 so that the tip of the protruding portion is in contact with the end face, and the upper side is pressed by one side of the angle-shaped bracket 14, and the bracket 14 is passed through a hole formed in the bracket and screwed into the insert. The grid body 1 and the bracket 14 are attached to the end surface of the already-worked lining concrete 6. Thereafter, the portion of the lattice 1 that will be located in the mold 7 is bent and fixed to the other side of the bracket 14 with a binding wire 10 or the like. Then, the lining concrete 6 is placed by placing the formwork 7 at a predetermined position in the next stage. Also in this method, since the leading end of the protruding portion 3 of the intersection joint 3 of the lattice body 1 is in contact with the mold 7 and is fixed by the bracket 14, the lattice body is positioned at the appropriate surface layer position of the next lining concrete 6. 1 can be buried.
Moreover, since such a construction method attaches the grid | lattice body 1 in a predetermined position beforehand including the lining concrete end surface already constructed before arrangement | positioning of the formwork 7, there exists the rebar assembled in the formwork 7 inside. This is suitable when there is no work space.
In this case, as shown in FIGS. 4 to 5, the end portion on the face side may be fixed to the inside of the wife form frame 9 by a binding wire 10 or a U-shaped stapler 10 ′. However, since the wife formwork 9 is for closing the lining concrete placement space after the formwork 7 is installed at a predetermined position, the installation work of the grid body 1 is performed from the lining concrete placement side. Is not easy. Therefore, the bracket 14 may be fixed to the reinforced concrete reinforcing bar so as to be in the direction opposite to the end portion on the wellhead side, the lattice body 1 may be fixed in advance thereto, and then the wife formwork 9 may be installed. .

As described above, in the lattice body of the present invention, the cross-section coupling body protruding in the out-of-plane direction functions as a spacer, and the tip thereof is directly or indirectly by a double-sided adhesive tape or various temporary fixing members. It can be attached to the inner surface of the formwork in contact with it, or it can be placed at an appropriate position by supporting it with brackets against the already-worked lining concrete. It is possible to embed in the surface layer of concrete easily and surely at an appropriate depth.
Therefore, according to the lattice body of the present invention, unlike the conventional fiber reinforced sheet shown in Patent Document 2, it does not float on the surface of the lining concrete, and can be reliably integrated with the lining concrete. Therefore, it is possible to reliably prevent the lining concrete surface layer from peeling off.

Although the embodiment of the present invention has been described above, the above embodiment is merely a preferred example, and the present invention is not limited to the above embodiment, and has an intersection joint that functions as a spacer. As long as it is, the lattice body of the present invention can be appropriately designed and applied.
For example, in the above-described embodiment, all the intersection coupling bodies are projected in one direction so that all of them function as spacers. However, this is not necessarily the case, and only some of the intersection coupling bodies are used as spacers. As long as it protrudes as much as possible, the other crossing joints may simply join the linear bodies.
Further, in the above embodiment, the intersection joint is protruded on one side of the lattice body. However, it is also conceivable that the intersection joint is protruded on both sides of the lattice body. Can be used without exception.

  In addition, the lattice body of the present invention is applicable not only to tunnel lining concrete but also to concrete bodies such as columns (side surfaces) and floor slabs (bottom surface). It is not limited to burial use.

  Furthermore, in the concrete body construction method described above, the construction method using the double-sided adhesive tape requires the use of a grid body having an intersection joint projecting in the out-of-plane direction. When the concrete body to be made is reinforced concrete, as shown in FIG. 10, the reinforcing bars 21 arranged at predetermined positions and the lattice body 1 are bound using temporary fixing members 20 having enlarged flat plates attached to both ends of the rod-like member. A construction method of fixing with the wire 10 is conceivable. In this case, as shown in FIG. 10, the cross-joint body may be brought into contact with the formwork 7, but since it is not always necessary to do so, the lattice body having the cross-joint body having almost no protrusion or the conventional structure Reinforcing sheets can be used. The same can be said for the construction method using the bracket 14.

DESCRIPTION OF SYMBOLS 1 Lattice body 2 Linear body 3 Intersection joined body 4 Jig 4a Groove 4b Recessed part 5 Nozzle 6 Covering concrete (concrete body)
7 Formwork (Centre skin plate)
7a Small hole 8 Double-sided adhesive tape 9 Wife form 10 Binding wire 10 'Stapler 11 Temporary fastening member 11a Holding plate 11b Leg 12 Temporary fastening member 12a Bolt 12b Nut 13 Pin (temporary fastening member)
14 Bracket 20 Temporary fastening member 21 Reinforcing bar

Claims (5)

A method for manufacturing a lattice body in which a linear body is formed in a lattice shape by intersecting with each other, and an intersecting portion coupling body protruding in an out-of-plane direction is provided at an intersecting portion of the linear bodies ,
Using a jig having vertical and horizontal grooves for cross-disposing linear bodies in two directions and having a recess for forming the cross-joint at the intersections of the grooves in each direction. The cross-shaped bodies are arranged in the grooves and filled with the fluidized cross-section joints in the recesses and hardened to form the cross-joints projecting in the out-of-plane direction. A method for manufacturing a lattice body, wherein linear bodies in two directions are coupled to each other by a partial coupling body. A concrete body is constructed in which a lattice body is formed in which a linear body intersects and is formed in a lattice shape, and a cross body is provided at the intersection of the linear bodies and protrudes out of the plane. A method for
By mounting the lattice body on the inner surface of the formwork for forming the concrete body in a state where the tip of the intersection joint is in contact with the inner surface of the formwork, and then placing the concrete in the formwork A method for constructing a concrete body, comprising embedding the lattice body integrally in a surface layer portion of the concrete body. A concrete body construction method according to claim 2 ,
A method for constructing a concrete body, characterized in that the mounting of the grid body on the inner surface of the formwork is brought into contact with the inner surface of the formwork through a double-sided adhesive tape that adheres the lattice body to the inner surface of the formwork. It is the construction method of the concrete body of Claim 2 or 3 ,
A concrete body construction method, wherein the grid body is attached to the inner surface of the mold by temporarily fastening the grid body to the inner surface of the mold with a temporary fixing member. A concrete body is constructed in which a lattice body is formed in which a linear body intersects and is formed in a lattice shape, and a cross body is provided at the intersection of the linear bodies and protrudes out of the plane. A method for
A bracket is fixed to an end face of an adjacent concrete body that has been constructed, and the lattice body is supported by the bracket and disposed at the position of the surface layer portion of the concrete body to be constructed in the next stage. The inner surface of the formwork is brought into contact with the tip of the joined portion of the crossing portion of the lattice body, and then the concrete body is placed in the formwork to integrate the lattice body with the surface layer portion of the concrete body. A concrete construction method characterized by being embedded in a concrete body.

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