JP2010275765A - Automatic joint forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To validate the effect of a joint and to reduce post-work after placing concrete to speed up work and to improve safety. <P>SOLUTION: The automatic joint forming apparatus 1 including a joint forming means 2 and a restraining means 9, is attached to the rear end side face corresponding to an outlet of a molding form. The joint forming means 2 is formed by sticking a roller 5 to the tip of a shaft 3 and sticking a pinion 7 to a base end, and the pinion 7 is rotatably meshed with a rack 9a. The pinion 7 is driven by a hydraulic motor 8. The automatic joint forming apparatus 1 is thereby movably constituted orthogonally to the height direction with respect to the moving direction of the molding form indicated by an arrow mark. The restraining means 9 includes the rack 9a provided hanging at the rear end side face of the molding form, and the moving locus of the roller 5 is restrained on the rack 9a with which the pinion 7 is meshed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an automatic joint forming apparatus capable of automating the construction of a concrete joint in a slip form method.

  The slip form method is a method of introducing a concrete dropped into a concrete molding machine that travels at a low speed into a molding form installed in the machine, and molding a predetermined concrete structure when demolding. In road construction, etc., it is used when continuously forming long concrete structures such as drainage gutters, wall rails, slope pavements, concrete guard fences, concrete pavements, etc.

  In this kind of concrete structure, for example, in order to cope with shrinkage and expansion of the concrete plate due to temperature change, a part of the surface of the concrete is cut to concentrate the shrinkage, thereby preventing the occurrence of cracks in other parts.

  Conventionally, for example, the formation of shrink joints in concrete guard fences, after hardening of the cast concrete, part of the surface is cut, for example, every 10 m to concentrate the initial shrinkage, and cracks occur in other parts Was preventing.

  However, in such a prior art, first, since the placed concrete starts initial shrinkage with hardening, there is a problem in that the effectiveness is insecure even if a shrink joint is applied after hardening.

  Further, when forming joints by cutting with a cutter, there are many problems in terms of extension of construction period, occurrence of accidents, and economical efficiency because they often depend on manual operations of skilled workers.

JP 2000-110110 A

  The object of the present invention is to solve the above-mentioned problems and to make the effect of joints effective by forming joints in the concrete structure before hardening immediately after placing.

  Moreover, it aims at reducing the post-work after concrete placement by automating the joint construction, speeding up the work, and improving the safety.

In order to achieve the above object, an automatic joint forming apparatus according to the present invention is a joint forming apparatus attached to a molding form installed in a movable concrete molding machine, wherein the joint forming apparatus is constrained with joint forming means. And a joint groove is provided in the concrete immediately after demolding provided at the outlet of the molding mold, the joint forming means is movable, and its moving direction is relative to the moving direction of the molding mold. The restraining means restrains the movement of the joint forming means on a certain locus perpendicular to the height direction.
The automatic joint forming apparatus according to claim 1, wherein a locus of the joint forming means can be adjusted within a range of 90 ° to 45 ° with respect to a moving direction of the molding frame.
Further, in the automatic joint forming apparatus according to claim 1, the joint forming means rotates.
In the automatic joint forming apparatus according to claim 1, the joint forming means slides.
The automatic joint forming apparatus according to claim 3 is characterized in that a pinion is fixed to a base end portion of the joint forming means, and the restraining means includes a rack meshing with the pinion.
The automatic joint forming device according to claim 4 is characterized in that the restraining means comprises a rail, and a tire fixed to the base end portion of the joint forming means is slidably fitted to the rail.

  According to the present invention, since joints can be formed in the concrete structure immediately after placing and before hardening, warpage due to stress due to shrinkage and expansion of the concrete plate due to temperature change and temperature difference between the surface and the bottom of the concrete plate. The effect by the joint of reducing the stress etc. which arise by this can be validated.

  In addition, since the construction of joints can be automated, post-work after concrete placement can be reduced, work can be speeded up, and safety can be improved.

It is a perspective view which illustrates an embodiment of an automatic joint formation device by the present invention. It is a figure of the state which applied the automatic joint formation apparatus of FIG. 1 to the molding mold. It is a figure of the concrete molding machine which installed the molding form with which the automatic joint formation apparatus of FIG. 1 was applied. (A) is an end view showing the shape of a joint groove formed by the automatic joint forming apparatus according to the present invention, (B) is another end view, and (C) is still another end view. It is an end elevation which shows the process of forming a shrink joint by the automatic joint formation apparatus concerning this invention, (A) shows a placement process, (B) shows a joint cutting process, (C) shows a shrink process. It is an end view which shows the process of forming an expansion joint by the automatic joint formation apparatus concerning this invention, (A) is the installation process of the expansion joint embedded, (B) is a placing process, (C) is a joint cutting process. , (D) shows the expansion step.

  Next, the automatic joint forming apparatus according to the present invention will be described in more detail with reference to the drawings illustrating the embodiments. For convenience, portions having the same function are denoted by the same reference numerals and description thereof is omitted.

  1 to 3, the automatic joint forming apparatus 1 according to the present invention comprises joint forming means 2 and restraining means 9, and is attached to the side surface of the rear end corresponding to the outlet 14 of the molding form 13. As shown in FIG. 3, the molding mold 13 is installed on the side surface of the concrete molding machine 11 and moves together with the concrete molding machine 11 in the arrow direction (shown in FIG. 2). In the joint forming means 2, a roller 5 is fixed to the distal end portion of the shaft 3, and a pinion 7 is fixed to the proximal end portion, and the pinion 7 meshes with the rack 9a in a rotatable manner. The pinion 7 is driven by a hydraulic motor 8, whereby the automatic joint forming apparatus 1 is configured to be movable perpendicular to the height direction with respect to the moving direction of the molding form 13 indicated by the arrow. The hydraulic motor 8 is driven by a power source of the concrete molding machine 11. The roller 5 has a circumferential surface formed in a weight shape. The teeth of the pinion 7 are formed in a trapezoidal shape. The restraining means 9 is composed of the rack 9a described above, and the rack 9a is suspended from the side surface 13a of the rear end portion of the mold 13 and restrains the movement trajectory of the roller 5 on the rack 9a with which the pinion 7 meshes. .

  FIG. 4 shows the shape of a joint groove formed by the automatic joint forming apparatus 1 according to the present invention. When the automatic joint forming apparatus 1 is composed of the roller 5, joint grooves 10a having a three-section cross section are formed (FIG. 4 (A)). When the roller has a trapezoidal peripheral surface (FIG. 4B), a joint groove 10c having a trapezoidal cross section is formed (FIG. 4C).

  The case where a shrink joint is formed will be described with reference to FIG. Concrete introduced from a concrete feeder such as a concrete mixer truck (not shown) into the molding frame 13 via the hopper 15 is compacted by applying appropriate vibrations by a vibrator (not shown) in the molding mold 13. The mold is removed from the outlet 14 opened at the rear part of the mold 13. 17 shows the concrete structure demolded on the roadbed (or embankment material) 18 (FIG. 5 (A)). Since the concrete structure 17 immediately after being demolded is not yet cured, the joint is formed by the automatic joint forming apparatus 1 according to the present invention in this uncured state.

  For example, when forming joints every 10 m, after the concrete placing process (FIG. 4A), a joint cutting process in which the concrete molding machine 11 is temporarily stopped every 10 m and the roller 5 is moved in the meantime. Perform (FIG. 5B). In this case, the locus of the joint forming means 2 is 90 ° with respect to the moving direction of the mold 13.

  Thus, when the joint groove contracts after a predetermined time has elapsed, the contracted joint is completed (FIG. 5C).

  Next, the case where an expansion joint is formed will be described with reference to FIG. The road bed 18 is provided with an embedded expansion joint 21 having anchor muscles 20 in advance (FIG. 6A). The concrete structure 17 is placed on the buried expansion joint 21 in the manner described above (FIG. 6B). Next, for example, a joint cutting process is performed every 20 m. In the case of an expanded joint, the joint forming means includes, for example, a pair of rollers 5a and 5b and a removing portion 6 connected between the rollers 5a and 5b. The removal unit 6 moves together with the rollers 5a and 5b (FIG. 6C). Thus, when the predetermined time elapses, the expansion joint 22 is completed (FIG. 6D).

  The automatic joint forming apparatus according to the present invention is not limited to the above embodiment. For example, the operation of the automatic joint forming apparatus 1 can be performed while the concrete molding machine 11, that is, the molding form 13 is moving. This movement is slow due to the placement of concrete, but the movement locus of the joint forming means 2 in this case is an oblique direction or a curve locus in relation to the movement speed of the mold 13, Alternatively, various trajectories of the intermediate points can be made like patterns. For example, if the starting point of the joint forming means 2 is set at an intermediate position of the restraining means 9 and moved up and down in accordance with the demolding state of the concrete, a horizontally long wave pattern joint is formed. Can do.

  Further, the joint forming means 2 for forming the joint groove may be moved not only by rotating itself as in the illustrated example but also by sliding. In this case, the appearance of the joint is good in the order of high-speed reverse rotation, high-speed forward rotation, natural rotation by friction, and press-cut cutting by sliding, and the cost is advantageous in the above order.

  In the case of sliding, for example, the restraining means 9 is composed of a rail, and a tire (not shown) fixed to the base end portion of the joint forming means 2 is slidably fitted to the rail.

  The drive source of the joint forming means 2 is arbitrary, and for example, an electric motor or a hydraulic cylinder can be applied. Also, sliding by pressing may be used.

  The peripheral surface shape of the roller 5 can be arbitrarily designed according to the purpose of the joint.

  The automatic joint forming apparatus according to the present invention can be widely used for concrete joint construction in the slip-form method.

DESCRIPTION OF SYMBOLS 1 Automatic joint formation apparatus 2 Joint formation means 3 Axis 5 Roller 6 Removal part 7 Pinion 8 Hydraulic motor 9 Restraining means 9a Rack 10a Joint groove 10b Joint groove 10c Joint groove 11 Concrete molding machine 13 Molding form 14 Exit 15 Hopper 17 Concrete structure Material 18 Subbase 19 Contraction joint 20 Anchor muscle 21 Embedded expansion joint 22 Expansion joint

Claims (6)

A joint forming apparatus attached to a molding form installed in a movable concrete molding machine, wherein the joint forming apparatus includes joint forming means and restraining means, and is provided at an outlet of the molding form. A joint groove is added to the concrete immediately after demolding,
The joint forming means is movable, the moving direction thereof is orthogonal to the height direction with respect to the moving direction of the molding frame,
The automatic joint forming apparatus, wherein the restraining means restrains movement of the joint forming means on a fixed locus.   2. The automatic joint forming apparatus according to claim 1, wherein a locus of the joint forming means can be adjusted in a range of 90 to 45 degrees with respect to a moving direction of the molding frame.   2. The automatic joint forming apparatus according to claim 1, wherein the joint forming means rotates.   2. The automatic joint forming apparatus according to claim 1, wherein said joint forming means slides.   4. The automatic joint forming apparatus according to claim 3, wherein a pinion is fixed to a base end portion of the joint forming means, and the restraining means comprises a rack meshing with the pinion.   5. The automatic joint forming apparatus according to claim 4, wherein the restraining means comprises a rail, and a tire fixed to the base end portion of the joint forming means is slidably fitted to the rail.

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