JP2005240400A - Precast concrete member joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining method for easily and smoothly joining precast concrete members to each other. <P>SOLUTION: The joining method for joining the precast concrete members to each other comprises a step of adhering one adhesive face 7a of a two-sided adhesive tape 6 to a joint face 11 of one precast concrete member 1 to paste the two-sided adhesive tape thereto and a step of adhering the other adhesive face 7b of the pasted two-sided adhesive tape 6 to a joint face 11 of the other precast concrete member 1 to join the precast concrete members 1 to each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for joining precast concrete members for joining together precast concrete members used to construct a structure.

  Prefabricated concrete members, so-called precast concrete members, are used in many applications such as ground buildings and structures, underground tunnels, underground pipes and the like. This precast concrete member is used to construct a predetermined structure by joining and integrating each other's joint surfaces on site. For example, when constructing a shield tunnel, an arc-shaped concrete segment is prepared. Then, these are connected in the circumferential direction to form a unit-length annular assembly, and the assembly is sequentially added in the axial direction to construct a shield tunnel lining body as a structure. In the step of configuring the segment assembly and the step of connecting the segment assemblies, the precast concrete members are joined together.

  As a method of joining concrete structural members with sufficient joining strength, joining two members with a steel material such as a wire and joining them by tensioning them, forming a so-called bolt box near the joining surface, There is a method of fastening the embedded metal fittings with bolts or the like. When joining concrete members by such a method, both positioning work and joining work must be performed simultaneously. Therefore, in order to perform the joining operation in a stable state as much as possible, provisional joining is performed by providing a fitting-type joint or applying a resin adhesive to the joining surface.

  However, in the conventional simple joining method as described above, in the method of providing a fitting-type joint, a complicated structure must be provided in the vicinity of the joint. On the other hand, when an adhesive is used, since it is necessary to apply the adhesive immediately before the joining operation, there are cases where the construction time becomes long or the joining cannot be performed at an appropriate timing after the application. In addition, since the adhesive is applied on site, the workability is poor and it is difficult to apply the adhesive with a uniform thickness, so that a good bonded state may not be obtained.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a joining method capable of easily and smoothly joining precast concrete members.

  The joining method of the precast concrete member of Claim 1 is a joining method for joining precast concrete members, Comprising: One adhesive surface of a double-sided adhesive tape is closely_contact | adhered to the joining surface of one precast concrete member. A step of affixing the double-sided pressure-sensitive adhesive tape; and a step of adhering the other pressure-sensitive adhesive surface of the affixed double-sided pressure-sensitive adhesive tape and the joint surface of the other precast concrete member to join the precast concrete members to each other. To do.

  In the first aspect of the present invention, an adhesive layer having a predetermined thickness is prepared in advance by a double-sided adhesive tape, and a precast concrete member (for example, a box culvert, an arch culvert, a U-shaped block (a U-shaped flume) is prepared. , U-shaped water channels, etc.) Adhesive layer of a certain thickness is formed on the joint surface by simply sticking one adhesive surface of the double-sided adhesive tape to the joint surface between each other and applying the double-sided adhesive tape. . Next, the pre-cast concrete members are bonded to each other through the adhesive layer by bringing the other pressure-sensitive adhesive surface of the attached double-sided pressure-sensitive adhesive tape into close contact with the bonding surface of the other pre-cast concrete member.

  The double-sided pressure-sensitive adhesive tape is a sheet-like one having two surfaces that are adhesive surfaces, and usually has a structure in which an adhesive layer is formed on both sides of a base material, but may also have a structure with a single layer of adhesive. . Each pressure-sensitive adhesive surface of the double-sided pressure-sensitive adhesive tape is coated with a release sheet having a surface property that makes it difficult to adhere to the adhesive layer, so that any surface can be formed simply by peeling off the release sheet on the side to be bonded immediately before use. Can be affixed to. The base material of the double-sided pressure-sensitive adhesive tape, the material and thickness of the adhesive layer, and the like can be appropriately set according to the application.

  The method for joining precast concrete members according to claim 2 is characterized in that after the joining step using the double-sided adhesive tape according to claim 1, a main joining step for further joining the precast concrete members to each other is performed. .

  In invention of Claim 2, in the state which joined the precast concrete members with the double-sided adhesive tape, a strong joining structure is constructed | assembled by further joining precast concrete members further.

  The method for joining precast concrete members according to claim 3 is the invention according to claim 1 or claim 2, wherein an end plate is provided on the joining surface, and a double-sided adhesive tape is affixed to the surface of the end plate. It is characterized by that.

  In the invention according to claim 3, since the end plate is provided on the joining surface, the surface of the end plate becomes at least a part of the joining surface, and a part of the joining surface is formed by the material of the end plate.

  In the method for joining precast concrete members according to claim 4, in the invention according to any one of claims 1 to 3, irregularities having shapes that engage with each other at the time of joining are formed on the joining surfaces that are joined together. The double-sided pressure-sensitive adhesive tape is arranged on the unevenness.

  In the invention according to the fourth aspect, the area of the joint surface increases and the concaves and convexes engage with each other. Moreover, the effect | action which pressurizes an adhesive agent at the time of joining works.

  According to the method for joining precast concrete members according to claim 1, in joining the precast concrete members, an adhesive layer having a uniform thickness is formed between the joining surfaces by a simple work process, and the precast concrete members are thereby formed. Concrete members can be joined together.

Hereinafter, a process of constructing a shield tunnel construction body, which is the first embodiment of the present invention, will be described with reference to the drawings of FIGS. 1 to 4D.
As shown in FIG. 1 to FIG. 3, the shield tunnel wearer has five arc-shaped segments 1a, 1b, 1c, 1d, and 1e (precast concrete members, hereinafter 1 when there is no need to specify). A plurality of segment assemblies 2 assembled in a ring shape are sequentially arranged in the axial direction.

  Each of these segments 1 is integrally connected in the circumferential direction by tensioning a PC steel material 4a provided through a duct 3a embedded in the circumferential direction. Further, the segment assemblies 2 are to tension the PC steel material 4b provided by inserting the duct 3b embedded in the axial direction into the predetermined segment 1 of the segments 1 constituting each segment assembly 2. Are integrally coupled in the axial direction. The ducts 3a and 3b are made of a flexible tube made of synthetic resin such as polyethylene or steel, and are embedded in the wide segments 1a, 1b, 1c, and 1d, respectively.

  The ducts 3a and 3b extending in the circumferential direction or the axial direction are opened on the inner surface side of a predetermined one of the segments 1, and the end portions of the PC steel materials 4a and 4b are fixed to these openings 10 respectively. A fixing tool 5 is provided for this purpose. Therefore, in the operation of integrating the segments 1 in the circumferential direction or the axial direction, the operator enters the inside with the segment assembly assembled or the segment assemblies connected together, and the PC steel material is inserted into the ducts 3a and 3b. 4a and 4b are inserted, tension is introduced by the jack 5a, and the fixing device 5 is fixed by a wedge or the like.

Hereinafter, the construction process of the shield tunnel construction body as described above will be described.
First, a double-sided pressure-sensitive adhesive tape 6 as shown in FIG. 3 is prepared. In this embodiment, the double-sided pressure-sensitive adhesive tape 6 is composed of a single-layer adhesive layer 7 and a release sheet 8 (see FIG. 3A) as shown in FIG. The structure which provided the adhesive bond layer 7 on both surfaces of the base material 9 as shown to b) may be sufficient. In this embodiment, the thickness of the double-sided pressure-sensitive adhesive tape 6, that is, the initial thickness of the adhesive layer 7 is about 1 to 2 mm, but the properties of the joint surface, the required joint strength, the type of adhesive, etc. It is set appropriately according to. As the adhesive, for example, an acrylic foam type is used, and an adhesive force is exerted by applying a pressing force of about 5 g / cm ² between the joint surfaces. Such a double-sided pressure-sensitive adhesive tape 6 is a roll in which the pressure-sensitive adhesive surfaces 7a and 7b on both sides are covered with the release sheet 8 or, as shown in FIG. It is prepared in the state.

  Next, as shown in FIG. 4A, a double-sided adhesive tape 6 is affixed to a predetermined location on the end face 11 on the face side of the segment assembly 3 that has already been installed. The pasting operation is simpler and shorter than the case of applying an adhesive because the double-sided pressure-sensitive adhesive tape 6 is simply cut to a required length or shape and the pressure-sensitive adhesive surface 7a is exposed. In the state where the double-sided adhesive tape 6 is attached to one segment 1, the other adhesive surface 7b is covered with the release sheet 8, so that foreign matters such as dust can be prevented from adhering during work or standby. The The new segment assembly 2 is assembled in advance, and the PC steel 4a is arranged in the circumferential direction to give tension.

  Next, as shown in FIG. 4B, the release sheet 8 is peeled off, and as shown in FIG. 4C, the new segment assembly 2 is directed toward the existing segment assembly 2 using a work machine such as a jack of a shield machine. Press. Thereby, as shown to FIG. 4D, the segment assemblies 2 are temporarily joined.

  Next, in order to perform main joining while introducing axial prestress to the segment assembly 2, two of the four PC steel members 4b arranged in the axial direction are tensioned using the jack 5a, and then fixed. It fixes to each cylinder part 5b of the tool 5 with the wedge etc. which are not shown in figure. Thereby, the segment assemblies 2 are firmly joined in the axial direction. Such an operation is performed by an operator entering the segment assembly 2 while the segment assembly 2 is pressed against the existing segment assembly 2 using a work machine such as a jack of a shield machine. At this time, the joining surfaces of the segments 1 of the segment assembly 2 are joined via the double-sided adhesive tape 6, and the displacement of the joining surfaces of the segments 1 is prevented by the fixing force in the shear direction. Therefore, the work of joining the segment assembly 2 can be reliably performed with good workability.

  5A to 5C show a modification of the above embodiment. In this embodiment, an end plate 12 made of a material such as a metal such as steel may be provided on the joint surface 11 and the double-sided adhesive tape 6 may be attached to the surface of the end plate 12. In this case, if the anchor bars 13 are attached to the end plate 12 by welding or the like and embedded in the concrete, the strength can be ensured. In this embodiment, the surface of the end plate 12 is a metal surface, and can be finished in advance so as to have an appropriate surface roughness so that the adhesive is easily adhered. Further, the properties of the joint surface 11 can be adjusted by performing a surface treatment such as plating. Further, for example, a thermosetting resin type adhesive that is cured by energizing and heating the adhesive layer 7 through the end plate 12 to exert an adhesive force can be used. The end plate 12 can be disposed on the entire surface excluding the portion of the duct 3b, but may be disposed only on a necessary portion.

  6A to 6C show another embodiment in which the present invention is used for joining the segment assemblies 2. In this embodiment, a so-called bolt box 14 is formed at a corner of each segment 1. The so-called bolt box 14 is a space for housing metal fittings, bolts, nuts and the like for bolting the segments 1 together. On the joint surface 11 between the segment assemblies 2, that is, the end surface 11 in the axial direction of each segment 1, a groove (unevenness) 15 a extending in the circumferential direction as shown in FIG. 15b are formed, and these are fitted to each other when the segment assembly 2 is abutted.

  In this embodiment, the double-sided pressure-sensitive adhesive tape 6 is disposed on the abutting surface of the groove 15a and the protrusion 15b. By doing in this way, since the adhesive layer 7 fills the sealed space formed by the groove 15a and the ridge 15b, the force to pressurize the adhesive layer 7 is increased, and the higher adhesive force is achieved. Can be demonstrated. Further, since the adhesive layer 7 fills the sealed space, the sealing function is improved. Such unevenness is useful for positioning at the time of installation, prevention of lateral displacement after installation, and also for improving the fixing action by increasing the adhesion area. The shape, size, position, and number of irregularities can be used as appropriate. In this embodiment, the sealing function between the joint surfaces 11 is ensured by arranging the double-sided pressure-sensitive adhesive tape 6 over the entire circumference excluding the bolt box 14.

7A to 7C are modifications of the above-described embodiment, and an end plate 12 made of steel or the like is arranged on the joint surface 11 as in the embodiment of FIGS. 5A to 5C. This end plate 12 may be used also as a fixing bracket for the bolt box 14, and is preferably disposed over the entire axial end surface (joint surface) 11 of each segment 1.
For example, the method of constructing a shield tunnel construction body using the segment 1 of the embodiment of FIGS. 5A to 7C and the effect of temporary bonding using the double-sided adhesive tape 6 are basically the same as those of the previous embodiment. It is the same.

  8A and 8B show another embodiment of the present invention, which is applied to the junction of a box culvert 16 for constructing a culvert. In this embodiment, the double-sided pressure-sensitive adhesive tape 6 is disposed between the joint surfaces 19 of two halved segments (precast concrete members) 16a and 16b that are divided into two vertically by a horizontal plane at the center of the left and right side walls 18. .

  In this embodiment, since a large force does not act on the joining surface 19 in the direction of shearing or pulling, this joining means can be minimized by using the double-sided pressure-sensitive adhesive tape 6 using a sufficiently strong adhesive. Or can be unnecessary. As the adhesive for the double-sided pressure-sensitive adhesive tape 6, an adhesive having a function of filling the gap between the surfaces is used, and the sealing property of the bonding surface 19 can be secured by sticking to the bonding surface 19 over the entire length in the axial direction. In this embodiment, the inner and outer corners of the joint surface 19 are chamfered, and the sealability can be further improved by arranging the joint material in the joint material filling groove 20 formed after joining. You may make it form the unevenness | corrugation of the shape which mutually fits in the joining surface 19 as employ | adopted in previous embodiment. Moreover, you may use together the positioning structure which consists of positioning members, such as a positioning pin, and the recess which attaches this.

  FIG. 9A and FIG. 9B show another embodiment of the present invention, which is an example used for the propulsion pipe 21 used for the propulsion method in which excavation is performed while pushing the propulsion rod into the ground laterally. is there. Originally, the propulsion pipe is manufactured as an integral cylinder, but as the diameter of the pipe tube increases, the divided pipes are integrated on site from the viewpoint of improving workability during transportation and construction. It became so. The outer surface of each half segment (precast concrete member) 22 constituting the propelling tube 21 is covered with a steel plate collar 23, and the strength is improved by arranging the bars or welding adjacent collars 23 to each other. I am letting. In addition, although illustration is abbreviate | omitted, for reinforcement, PC steel materials (wire) are inserted in the duct arrange | positioned in the circumferential direction, and the tension | tensile_strength is given by making the propulsion pipe circulate. Further, in order to transmit the shearing force in the axial direction to each other, the joining surface 24 is provided with a shearing force transmission mechanism including a shearing pin and a recess fitted therein.

In this embodiment, the process of joining the propelling pipe segments to form an integral propelling pipe is basically the same as the previous embodiment. The double-sided pressure-sensitive adhesive tape 6 to be affixed to the joint surface 25 is preferably formed with an opening for inserting a shear pin or a PC steel material in advance. Of course, you may use together with another joining method as needed.
In the embodiment of FIGS. 8A to 9B, it goes without saying that the double-sided pressure-sensitive adhesive tape 6 can be used for temporary bonding or main bonding in the axial direction.

  FIGS. 10A and 10B show still another embodiment of the present invention. In the sewer system, the manhole structure is a rectangular box-shaped cylindrical portion extending upward from the underground sewer in the sewer system. This is applied to the process of joining the 25 side walls 26a, 26b. Also in this embodiment, the double-sided pressure-sensitive adhesive tape 6 can be used to form a temporary joining structure having a sealing property. In this case, as a method for the main joining, joining by bolts is usually employed. Of course, according to the case, joining itself with the double-sided adhesive tape 6 can be used as this joining structure. Moreover, although not shown, it cannot be overemphasized that it can use for joining of other junction parts, for example, a bottom wall or an upper board, and a side wall.

It is a figure explaining the joining method concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view which shows the structure of the shield tunnel mounting body constructed | assembled by the joining method of FIG. Similarly, it is a cross-sectional view. (A) thru | or (c) show the example of a double-sided adhesive tape. It is a figure which shows arrangement | positioning of the double-sided adhesive tape in the joining method of 1st Embodiment. It is a figure which shows the joining process in the joining method of 1st Embodiment. Similarly, it is a figure which shows the joining process in the joining method of 1st Embodiment. It is a figure which shows the joining state in the joining method of 1st Embodiment. It is a figure which shows arrangement | positioning of the double-sided adhesive tape in the joining method of the modification of 1st Embodiment. It is a figure which shows the joining process in the joining method of the modification of 1st Embodiment. It is a figure which shows the joining state in the joining method of the modification of 1st Embodiment. It is a figure which shows arrangement | positioning of the double-sided adhesive tape in the joining method of 2nd Embodiment. It is a figure which shows the joining process in the joining method of 2nd Embodiment. It is a figure which shows the joining state in the joining method of 2nd Embodiment. It is a figure which shows arrangement | positioning of the double-sided adhesive tape in the joining method of the modification of 2nd Embodiment. It is a figure which shows the joining process in the joining method of the modification of 2nd Embodiment. It is a figure which shows the joining state in the joining method of the modification of 2nd Embodiment. It is the (a) perspective view and the (b) sectional view showing the state before joining of the joining method of a 3rd embodiment of this invention. It is the (a) perspective view and the (b) sectional view showing the state after joining of the joining method of a 3rd embodiment of this invention. It is (a) perspective view which shows the state before joining of the joining method of the 4th Embodiment of this invention, (b) It is sectional drawing. It is the (a) perspective view and the (b) sectional view showing the state after joining of the joining method of a 4th embodiment of this invention. It is the (a) perspective view and the (b) sectional view showing the state before joining of the joining method of a 5th embodiment of this invention. It is the (a) perspective view and the (b) sectional view showing the state after joining of the joining method of a 5th embodiment of this invention.

Explanation of symbols

1, 1a, 1b, 1c, 1d, 1e Segment (concrete member)
6 Double-sided adhesive tape 7 Adhesive layer 7a Adhesive surface (first adhesive surface)
7b Adhesive surface (second adhesive surface)
11 End face (joint face)
12 End plate 15a Groove (unevenness)
15b Ridge (unevenness)
16a, 16b Half segment (concrete member)
19 Joint surface 22 Half segment (Precast concrete member)
24 joint surface

Claims (4)

A joining method for joining precast concrete members,
A step of adhering the double-sided pressure-sensitive adhesive tape by sticking one adhesive surface of the double-sided pressure-sensitive adhesive tape to the joint surface of the one precast concrete member;
A method of joining the precast concrete members, comprising the step of bringing the other adhesive surface of the affixed double-sided adhesive tape and the joint surface of the other precast concrete member into close contact with each other, and joining the precast concrete members to each other .   The joining method of the precast concrete member which performs the main joining process for further joining the said precast concrete members further after the joining process by the said double-sided adhesive tape of Claim 1.   The method for joining precast concrete members according to claim 1 or 2, wherein an end plate is provided on the joining surface, and the double-sided adhesive tape is affixed to a surface of the end plate.   4. The concave and convex portions that are engaged with each other at the time of bonding are formed on the bonding surfaces that are bonded to each other, and the double-sided pressure-sensitive adhesive tape is disposed on the concave and convex portions. A method for joining precast concrete members as described in 1.

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