JP4774333B2 - Sealing method for joints of precast concrete members - Google Patents

Description

  The present invention belongs to a technical field of a joint sealing method for preventing grout from leaking from a joint portion of the joint portion when jointing precast concrete members by a grout filling method.

  Conventionally, in the precast construction method, when joining precast concrete members with a grout filling method, a packer is installed along the outer peripheral edge of the joint in order to prevent the grout from leaking from the joint of the joint. A joint sealing method (hereinafter referred to as a packer plan) to be performed and a joint sealing method (hereinafter referred to as a grout plan) for filling a grout solidified material along the outer peripheral edge of the joint portion are widely known.

In the packer plan, usually, the packer is installed along the outer peripheral edge of the joint portion to close the outer periphery of the joint portion, and then the grout is filled in the joint portion of the precast concrete member. After the grout has hardened, the packer is removed, the packer paste is cleansed, and the packer installation trace is filled with mortar.
The grout plan is usually carried out by a procedure of filling grout into the joint portion of the precast concrete member after filling the grout solidified material along the outer peripheral edge of the joint and sufficiently curing it (for example, Patent Document 1). FIG. 6).

The packer proposal has a problem that it has many construction procedures, takes time, and has poor workability and economy. In addition, there is a problem that the work cannot be performed because the packer paste does not fix during rainfall. Further, due to the elastic deformation of the packer, there is a risk of returning to the position before correction after the precast concrete beam has been rebuilt (built). In addition, since the packer is disposable, there is a problem that it becomes an industrial waste.
Although the grout plan has few construction procedures, it usually has to be cured by stuffing the grout solid material by the day before the grout filling operation, and it takes a work period and is not economical. In addition, like the packer plan, there is a problem that it is affected by the weather, such as being unable to grout when it rains, and further requiring anti-freezing curing of the grout in cold regions. In addition, it was necessary to unload and supply grout material to each floor, and workability was poor.

  Therefore, in recent years, a dry method that does not depend on the weather using a mold has been adopted in contrast to the wet method that depends on the weather such as the packer plan and the grout plan (see, for example, Patent Documents 1 and 2).

In the technique according to Patent Document 1, a rubber packing is attached to the outer periphery of the joint part, and on the outer side, four steel frame pieces are assembled using welding, hinges or bolts and nuts. (See FIGS. 1 to 5 of the document 1).
In the technology according to Patent Document 2, four linear seal frames are provided at one end of each seal frame so that a push bolt that moves back and forth facing the end face can be adjusted. A mold frame assembled in a cross-beam shape by sandwiching the end portion of the other seal frame that does not have a push bolt between the opposite end surface and the opposite end face is installed on the outer periphery of the joint portion without any gap.

  Since the techniques according to Patent Documents 1 and 2 are both implemented by a dry method, there is an advantage that the techniques can be implemented without being influenced by the weather or the like. Also, there are few construction procedures and there is no need to unload the mortar material.

Japanese Utility Model Publication No. 5-83195 JP-A-6-43143

  The technique according to Patent Document 1 has no means for adjusting the size of the formwork, and it is doubtful whether it can be positioned and fixed precisely at the joint between the precast concrete members. Furthermore, it is considered impossible to prevent the outflow of the grout by pressing the rubber packing at a pressure larger than the grout filling pressure. Moreover, in order to cope with precast concrete members having different diameters, a new form must be manufactured, and there is no flexibility and it is uneconomical.

  Since the technique according to Patent Document 2 can adjust the size of the mold, the problem according to Patent Document 1 does not occur. However, the provision of the adjusting means has a problem that the number of members is large, the work of positioning and fixing at a predetermined position is troublesome and workability is poor. Moreover, although it can respond to the precast concrete member from which a diameter differs to some extent, there exists a problem that it cannot respond | correspond at all to a different shape precast concrete member, if it puts an extreme, cylindrical precast concrete member.

  The object of the present invention is to use a tube body that can be easily and reliably positioned on the outer periphery of the joint portion of the joint portion of the precast concrete member, so that the work can be performed without being influenced by the weather, and the outside of the grout. It is possible to reliably prevent leakage of steel, as well as to flexibly cope with the joining of precast concrete members with different diameters and precast concrete members with shapes other than rectangular shapes such as cylindrical shapes. Another object of the present invention is to provide a joint sealing method at a joint portion of a precast concrete member having excellent flexibility.

As a means for solving the above-mentioned problems of the prior art, the joint sealing method in the joint portion of the precast concrete member according to the invention described in claim 1 is:
A joint sealing method at the joint of precast concrete members,
A tube body that can be expanded and contracted is wound along the outer peripheral surface of the joint portion, the joint portion outer periphery of the joint portion is closed, and a fluid material such as air is sucked from the tube body by a suction device such as a vacuum pump. By eliminating and shrinking the tube body, the outer periphery of the joint portion at the joint portion is tightly sealed without a gap with a pressure larger than the grout filling pressure.

  The invention described in claim 2 is the joint sealing method in the joint part of the precast concrete member described in claim 1, wherein the tube body does not bite into the joint part even if the fluid material such as air is sucked out. In addition, it is characterized in that it is formed of a member having a larger axial expansion / contraction ratio than the radial expansion / contraction ratio.

  According to a third aspect of the present invention, in the joint sealing method in the joint portion of the precast concrete member according to the first or second aspect, the tube body is formed by connecting an air tube body with a mechanical joint. And

The joint-sealing method at the joint portion of the precast concrete member according to claims 1 to 3 has the following effects.
1) The outer periphery of the joint at the joint of the precast concrete member is tightly sealed by tightening the outer periphery of the joint at the joint with a pressure larger than the grout filling pressure using a tube body that can be easily and reliably closed. Therefore, leakage to the outside of the grout can be surely prevented. In addition, additional filling of joints after grout filling is not necessary. Therefore, it is excellent in workability.
2) It is possible to flexibly cope with the joining of precast concrete members having different diameters and precast concrete members having a shape other than a square shape such as a cylindrical shape. Therefore, it is excellent in flexibility.
3) Since it is carried out by the so-called dry method, it can be carried out without being influenced by the weather, etc., additional joint filling after grout filling is unnecessary, construction procedures are few, and there is no need to unload the mortar material. Therefore, it is excellent in workability.
4) After performing grout filling work and confirming that the grout has hardened, it can be easily removed and diverted smoothly to grout filling work at other joints, reducing industrial waste. it can. Therefore, it is economical.

  The joint sealing method in the joint part of the precast concrete member which concerns on this invention is implemented as follows, in order to show | play the effect of the invention mentioned above.

  1 to 4 show an embodiment of the joint sealing method in the joint portion 10 of the precast concrete members 1 and 2 described in claim 1. In this joint sealing method, the tube body 3 that can be expanded and contracted is wound along the outer peripheral surface of the joint portion 10 to close the outer periphery of the joint portion X in the joint portion 10, and a suction device 9 such as a vacuum pump 9 is used. By sucking out a fluid material such as air from the tube body 3 and contracting the tube body 3, the outer periphery of the joint portion X in the joint portion 10 is tightly sealed with a pressure larger than the grout filling pressure. (Invention of Claim 1).

  The precast concrete members 1 and 2 according to the illustrated example are both implemented as column members, and the joint portion X includes a column base portion of the upper column member 1 and a column head portion of the lower column member 2. Formed in between. As for the internal structure of the precast concrete members 1 and 2 according to the illustrated example, as shown in FIG. 1, a plurality of column main bars 5 project from the upper surface of the lower column member 2, and the upper column member 1. This is implemented by a so-called skewered structure in which a main body sleeve joint 6 is provided at the column base. Of course, the embodiment is not limited to this, and although not shown in the drawings, a plurality of column main bars 5 project from the lower surface of the upper column member 1, and the sleeve joint 6 of the main bar is formed on the column head of the lower column member 1. The present invention can be similarly applied to a so-called reverse skewering structure provided with a. Incidentally, reference numeral 6a in the figure indicates a grout filling hole or an air vent hole.

  The tube body 3 is formed by a member having a large expansion / contraction ratio in the axial direction compared to the expansion / contraction ratio in the radial direction so as not to bite into the joint portion X even if the fluid material such as air is sucked out. (Invention of claim 2). Air is used for the fluid material according to the present embodiment, and the tube body 3 is implemented using the air tube body 3 accordingly. Of course, the fluid material is not limited to air, and the fluid material such as water can be similarly applied.

  Although the tube body 3 which concerns on the example of illustration is implemented by the bellows shape, it is not limited to this, You may implement by the expansion-contraction anisotropic member from which an expansion-contraction rate differs in a radial direction and an axial direction. Further, the air tube body 3 according to the illustrated example is formed by connecting the air tube body 3 as shown in FIG. 4 with a mechanical joint 4 to form an annular shape (the invention according to claim 3). Of course, a plurality of air tube bodies 3 can be used and connected in series by a mechanical joint 4 according to the outer diameter of the joint 10 and the length of the air tube body 3 to be used. Incidentally, reference numeral 7 in FIG. 2 indicates a suction port provided for sucking air, reference numeral 8 indicates a connection tube having one end connected to the suction port 7, and reference numeral 9 indicates The vacuum pump connected to the other end of the connection tube 8 is shown. By the way, although the vacuum pipe 9 is used as the suction device 9 in the present embodiment, the present invention is not limited to this, and the suction device 9 can be similarly implemented with a cleaner or the like. When water is used as the fluid material, a water absorber is used as the suction device 9.

  In the joint sealing method according to the present invention, first, the bellows-shaped air tube body 3 is annularly formed on the outer periphery of the joint portion X formed in the joint portion 10 of the precast concrete column members 1 and 2 using the mechanical joint 4. To form and position. The air tube body 3 is previously formed in a floating ring shape to which air is supplied to some extent, and is positioned on the outer periphery of the joint portion X using the contraction force. In addition, when the contraction force is weak, or when water is used as the fluid material, the tube body 3 is positioned by installing a gantry or supporting by an operator as necessary. Of course, it can be implemented.

  Next, the air inside the air tube body 3 is sucked out by the vacuum pump 9 so that the air tube body 3 is particularly contracted in the axial direction, and the inner surface firmly closes the outer periphery of the joint portion X. At the same time, tighten and seal with a pressure greater than the grout filling pressure. Therefore, it is possible to reliably prevent leakage of the grout filling the joint portion X and the sleeve joint 6 to the outside.

  Since the air tube body 3 can be flexibly deformed according to the size and shape of the (column) members 1 and 2, a precast concrete member having a different diameter or a precast concrete member having a shape other than a square shape such as a columnar shape is used. It is possible to flexibly cope with the joining.

  The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and design modifications and application variations that are usually made by those skilled in the art are within the scope of the technical idea of the invention. Note that it includes the range. For example, in this embodiment, the present invention is applied to the joining of the precast concrete column members 1 and 2, but the present invention can be similarly applied to the joining of the precast concrete beam members. 5A to 5C, the shape of the column beam joint portion in the columns 1, 2 or the beam 11 is slightly different from the columns 1, 2 or the beam 11 (about 10 cm in the illustrated example). ) By carrying out in the protruding form, the present invention can be similarly applied to the connection between the column and the beam.

It is the elevation sectional view showing the joint sealing method in the joined part of a precast concrete member. It is the perspective view which showed the joint sealing method in the junction part of a precast concrete member. It is the front view which showed the joint sealing method in the junction part of a precast concrete member. It is the front view which showed the air tube body used for the joint sealing method in the junction part of a precast concrete member. AC is the front view which showed the variation of the joint-sealing method in the junction part of a precast concrete member roughly, respectively.

Explanation of symbols

1 Precast concrete members (column members)
2 Precast concrete members (column members)
3 Tube body 4 Mechanical joint 5 Main bar (column main bar)
6 Sleeve joint 6a Grout filling hole (air vent hole)
7 Suction port 8 Connection tube 9 Suction device 10 Joint 11 Beam X Joint

Claims (3)

A joint sealing method at the joint of precast concrete members,
A tube body that can be expanded and contracted is wound along the outer peripheral surface of the joint portion, the joint portion outer periphery of the joint portion is closed, and a fluid material such as air is sucked from the tube body by a suction device such as a vacuum pump. A joint sealing method for a joint portion of a precast concrete member, wherein the tube body is contracted by excluding it, and the joint portion outer periphery of the joint portion is tightly sealed with a pressure larger than a grout filling pressure without gaps.   The tube body is formed of a member having a large axial expansion / contraction ratio compared to the radial expansion / contraction ratio so as not to bite into the joint even if the fluid material such as air is sucked out. The joint-sealing method in the junction part of the precast concrete member of Claim 1.   The said tube body connects a tube body with a mechanical joint, and forms it cyclically | annularly, The jointing method in the junction part of the precast concrete member of Claim 1 or 2 characterized by the above-mentioned.

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