Precast members, joint structures for precast members, and methods for manufacturing them.

Abstract

To provide: a precast member enabling producing joint structures of the precast member at low cost in a short construction period; a joint structure of the precast member; and a construction method thereof.SOLUTION: A precast member 1 (2) has joint surfaces 11 (21) at both ends in the extension direction, and formed with a vertical joint 4 in the joint surface 11 (21) through filling of a grout 3. The precast member includes: a protrusion 12 (22) continuously formed on at least right and left edges of each joint surface 11 (21) at both ends; and a regular sealing material 5 affixed adjacent to the protrusion 12 (22) on the at least one joint surface 11 (21) side.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a precast member in which a reinforced concrete member is precast, a joint structure of the precast member, and a method for producing the same.

Background Art

[0002] Structures and construction methods for assembling precast members in which reinforced concrete members are precast at a construction site are known. In this structure and construction method, in order to absorb manufacturing errors of the precast members and construction errors at the construction site, vertical joints are formed by leaving a gap between the joint surfaces of the precast members. Further, in the case of a reinforced concrete structure, in order to transmit the member cross-sectional stress, the reinforcing bars (main bars) of the precast members are joint-connected at the vertical joints. As this joint connection, when using a mechanical joint embedded on the joint surface side of one precast member, grout is filled into the joint parts of this mechanical joint and at the same time grout is also filled between the joint surfaces.

[0003] In this grout filling, it is necessary to install a stop frame for stopping the outflow of liquid grout around the vertical joint. As the stop frame, a frame member having a structure for connection with the precast member and capable of withstanding the filling pressure is used. Alternatively, there is also a method of packing solidified mortar from the outside of the vertical joint and curing it to form a stop frame.

[0004] Note that Patent Document 1 discloses a joint sealing method in which a tube body is inserted along the outer peripheral edge of the joint part of a precast concrete member without a gap.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the method using mortar as the retaining frame has the disadvantage of a longer construction period because the grout filling work cannot begin until the mortar hardens. In addition, the method using the frame members mentioned above has the disadvantage of higher construction costs due to the effort required to manufacture the frame members.

[0007] The purpose of this invention is to provide a precast member, a precast member joint structure, and a method for constructing the same, which enable the production of precast member joint structures in a short period of time and at low cost. [Means for solving the problem]

[0008] The precast member of this invention has joint surfaces at both ends in the extension direction, and a vertical joint is formed on the joint surface by grout filling, and is characterized by comprising: a protruding portion that extends vertically continuously from the joint surface on at least the left and right edges of each joint surface at both ends, and a pre-formed sealing material attached adjacent to the protruding portion on the grout filling area side on at least one of the joint surfaces.

[0009] With the above configuration, by butting the joint surfaces of adjacent precast members together, a sealing portion is formed between the joint surfaces to seal the grout, formed by the protrusions on the precast members themselves and the pre-formed sealing material attached adjacent to the protrusions. Therefore, there is no need to wait for the mortar to harden as in the conventional method, which shortens the construction period and reduces costs compared to using conventional frame members. Furthermore, even if the pre-formed sealing material tries to protrude outward due to the filling pressure of the grout, it is held in place by the protrusions. Even if the vertical joint spacing between precast members is somewhat wider than the design value and the pressing force on the pre-formed sealing material is reduced, the pre-formed sealing material is held in place by the protrusions, preventing leakage of the grout. Therefore, the allowable range of vertical joint width during the installation of the precast members is increased, and construction can be expedited.

[0010] In the above-described precast member, the protruding portion and the standard sealing material extend from the upper edge side of the joint surface, while a portion of this upper edge side may be a non-sealing portion for the grout. This makes it possible to adjust the grout filling speed while visually checking the grout filling state between the joint surfaces of adjacent precast members at the non-sealing portion. Furthermore, the non-sealing portion can also function as an air vent during grout filling.

[0011] In the precast member described above, the protruding portion and the standard sealing material may be interrupted at the lower end of one of the left and right edges to form a drainage opening. This allows rainwater that has seeped in before the grout is filled between the joint surfaces to be discharged through the drainage opening.

[0012] The above-mentioned precast member comprises at least a foundation beam section and a footing section extending laterally from the lower part of the foundation beam section, with reinforcing bars protruding from one joint surface of the foundation beam section, and a mechanical joint may be embedded on the other joint surface side of the foundation beam section to connect reinforcing bars protruding from the joint surface of an adjacent precast member.

[0013] In the above-mentioned precast member, the protrusion extends outward through the footing portion on the lower side of one of the left and right edges, the lower end of the standard sealant located on that one edge side extends laterally outward adjacent to the lateral protrusion, and the lower end of the standard sealant located on the other edge side of the left and right edges also extends laterally outward, and the outer ends between these laterally extended standard sealants may be used as drainage openings.

[0014] Furthermore, the joint structure for precast members of this invention is a joint structure for precast members in which a vertical joint is formed by filling the mutually opposing joint surfaces of one adjacent precast member and the other precast member with grout, and the standard sealing material is pressed against the joint surfaces by butting them together.

[0015] With the above configuration, the grout filling the joint surface is sealed by the protrusions provided by the precast member itself and the standard sealing material attached adjacent to the protrusions. Therefore, in the production of this joint structure, mortar hardening is unnecessary, and conventional frame members are also unnecessary.

[0016] Furthermore, the method for creating a joint structure for precast members according to this invention is a method for creating a joint structure by joining the above-mentioned precast members together, The process involves butting the joint surfaces of adjacent precast members together with the above-mentioned standard sealant in place, and pressing the standard sealant against them. The step of filling the gap between the above-mentioned joint surfaces with grout, It is characterized by including.

[0017] With this method, by butting the joint surfaces of adjacent precast members together, the standard sealing material is pressed against them, forming a sealing section between the joint surfaces that can seal the grout. Therefore, there is no need to wait for the mortar to harden as in the conventional method, which shortens the construction period and reduces costs compared to using conventional frame members.

[0018] Furthermore, the method for creating a joint structure for precast members according to this invention is a method for creating a joint structure by joining precast members having the above-mentioned drainage holes together, The process involves butting the joint surfaces of adjacent precast members together with the above-mentioned standard sealant in place, and pressing the standard sealant against them. The step of filling the gap between the above-mentioned joint surfaces with grout, After the grout comes out of the drain hole, the step of plugging the drain hole, which is characterized by including.

[0019] In such a method, after the grout comes out of the drain hole, the drain hole is plugged, so that rainwater that has infiltrated at the stage before filling the grout between the joint surfaces can be discharged from the drain hole, and only the grout can be filled between the joint surfaces.

[0020] In the manufacturing method, a precast member with the fixed sealing material already pasted may be transported to the construction site where the precast member is installed. According to this, the operation of pasting the fixed sealing material at the construction site becomes unnecessary, and the construction can be speeded up.

Effect of the Invention

[0021] According to the present invention, the joint structure of the precast member can be manufactured at a low cost, and the construction period can be shortened.

Brief Description of the Drawings

[0022] [Figure 1] FIG. (A) is a perspective explanatory view showing the joint structure of the precast member of the embodiment, FIG. (B) is a cross-sectional explanatory view showing the vertical joint portion, and FIG. (C) is an enlarged explanatory view showing the vertical joint portion. [Figure 2] It is a perspective explanatory view showing the precast member of the embodiment. [Figure 3] It is a perspective explanatory view showing the precast member and the mechanical joint of the embodiment. [Figure 4] It is a perspective explanatory view showing the manufacturing method of the joint structure of the precast member of the embodiment. [Figure 5] It is a perspective explanatory view showing the manufacturing method of the joint structure of the precast member of the embodiment. [Figure 6] It is an explanatory view showing the non-sealed portion of the precast member of the embodiment.

Mode for Carrying Out the Invention

[0023] Hereinafter, an embodiment according to one aspect of this invention will be described based on the attached drawings. As shown in Figures 1(A), 1(B), and 1(C), the joint structure 100 of the precast members in this embodiment is a structure in which grout 3 is filled between the mutually opposing joint surfaces 11, 21 of one precast member 1 and the other precast member 2 to form a vertical joint 4.

[0024] The precast member 1 and precast member 2 described above have the same structure and have joint surfaces 11 and 21 at both ends in the extension direction of each. Furthermore, as shown in Figure 2, the precast member 1 has a foundation beam section 15, a footing section 16 that extends laterally from the lower part of the foundation beam section 15, and a parapet section 17 that rises from the upper surface of the foundation beam section 15. Similarly, the precast member 2 also has a foundation beam section 25, a footing section 26 that extends laterally from the lower part of the foundation beam section 25, and a parapet section 27 that rises from the upper surface of the foundation beam section 25.

[0025] In the foundation beam sections 15 and 25 of the precast members 1 and 2, four main reinforcement bars 15a and 25a are embedded in a predetermined arrangement, and these four main reinforcement bars 15a and 25a protrude from one of the joint surfaces 11 and 21 in the direction of extension of the precast members 1 and 2 for a predetermined length.

[0026] Furthermore, mechanical joints 18 and 28 are embedded in the other joint surfaces 11 and 21 of the foundation beam sections 15 and 25 of the precast members 1 and 2.

[0027] As shown in Figure 3, the mechanical joint 18 in the precast member 1 has four joint parts 18a into which the four main reinforcing bars 25a protruding from one joint surface 21 of the precast member 2 are inserted. The ends of the main reinforcing bars 15a in the foundation beam section 15 are located in each joint part 18a, and the space between the main reinforcing bars 15a and the end opening of the joint part 18a is sealed with a rubber plug. In addition, two resin pipes 18c are connected to each joint part 18a and extend vertically, and the upper ends of each resin pipe 18c are exposed on the upper surface of the foundation beam section 15.

[0028] One of the eight resin pipes 18c is used for introducing liquid grout 3, and the other seven are used for discharging the liquid grout 3. The liquid grout 3 introduced through the resin pipe 18c for introducing liquid grout is filled between the joint surfaces 11 and 21 and into the joint component 18a. That is, the main reinforcement bars 25a protruding from one joint surface 21 of the foundation beam section 25 of the precast member 2 are joined to the other main reinforcement bars 15a within the resin pipe 18c of the mechanical joint 18 of the other foundation beam section 15.

[0029] On a portion of the upper edge and the left and right edges of the joint surfaces 11 and 21 of the precast members 1 and 2, protruding portions 12 and 22 are formed, respectively, that are continuously formed in the horizontal and vertical directions and protrude from the joint surfaces 11 and 21. The amount of protrusion of the protruding portions 12 and 22 is, for example, about 10 mm. The design separation distance between the protruding portions 12 and 22 in the joint structure 100 of the precast members is, for example, about 8 mm. The inner corners of the protruding portions 12 and 22 (the corners on the joint surface 11 and 12 side) may be chamfered, or they may not be chamfered in order to improve the adhesion of the standard sealing material 5 described later.

[0030] On one side of the precast members 1 and 2 (for example, the side where the mechanical joint 18 is located), the joint surfaces 11 and 12 are affixed with a pre-formed sealant 5 adjacent to the protruding portions 12 and 22. Alternatively, the precast members 1 and 2 may be configured to have the pre-formed sealant 5 affixed to the joint surfaces 11 and 21 at both ends.

[0031] In the joint structure 100 of the precast member, the standard sealant 5 is pressed by the joint surfaces 11 and 21 and exists in a compressed state. The area where the protrusions 12 and 22 and the standard sealant 5 are located is a furring area with a width of approximately 30 mm and is not considered a structural element of the foundation beams 15 and 25. In other words, the joint surfaces 11 and 21 consist of a grout-filled area where grout is filled and a furring area located outside this grout-filled area.

[0032] For example, the cross-sectional shape of the pre-formed sealing material 5 in its unpressed state is rectangular, with a height of approximately 35 mm in the direction of pressing and a width of approximately 20 mm. The pre-formed sealing material 5 is made of, for example, EPDM (ethylene propylene diene rubber) foam. The grout 3 introduced between the joint surfaces 11 and 21 is sealed by the pre-formed sealing material 5.

[0033] Furthermore, on the lower side of one of the left and right edges (the side where the low wall sections 17 and 27 are not located), the protrusions 12 and 22 extend outward by passing horizontally along the lower side of the footing sections 16 and 26, and the lower end of the standard sealant 5 located on that side of the edge extends horizontally outward adjacent to the horizontal protrusions 12 and 22. The lower end of the standard sealant 5 on the other side of the left and right edges also extends horizontally outward, and the outer ends between these horizontally extended standard sealants serve as drainage openings 6.

[0034] Here, if the precast members 1 and 2 are equipped with a level adjustment mechanism, and concrete is poured into the gap between the lower surface of the precast members 1 and 2 and the level concrete, even if the protrusions 12 and 22 are not provided on the lower ends of the foundation beam sections 15 and 25 and the lower ends of the footing sections 16 and 26, the standard sealing material 5 that extends laterally on these lower ends will be supported by the concrete when pressure is applied during the filling of the grout 3, and the presence of the standard sealing material 5 prevents the concrete from seeping into the joint surfaces 11 and 21. Of course, the structure may also include protrusions 12 and 22 on the lower ends of the footing sections 16 and 26.

[0035] With the precast members 1, 2 and joint structure 100 described above, by butting the joint surfaces 11, 21 of adjacent precast members 1, 2 together, a sealing portion is formed between the joint surfaces 11, 21 that seals the grout 3, by the protrusions 12, 22 provided by the precast members 1, 2 themselves and the standard sealing material 5 located adjacent to the protrusions 12, 22. Therefore, there is no need to wait for the mortar to harden as in the conventional method, which shortens the construction period and reduces costs compared to using conventional frame members.

[0036] Furthermore, even if the pressure of the grout 3 causes the pre-formed sealant 5 to protrude outwards, it will be held in place by the protrusions 12 and 22. Even if the joint spacing between the precast members 1 and 2 is somewhat wider than the design value, resulting in lower pressure on the pre-formed sealant 5, the sealant 5 will still be held in place by the protrusions 12 and 22, preventing leakage of the grout 3. Therefore, the allowable range for the width of the vertical joints during the installation of the precast members 1 and 2 is increased, allowing for faster construction.

[0037] Next, a method for manufacturing the joint structure 100 of the precast members in this embodiment will be described. As shown in Figure 4, the joint surface 21 of the other precast member 2 is brought into contact with the joint surface 11 of one precast member 1 that has already been installed. Then, these joint surfaces 11 and 21 are brought together and the standard sealing material 5 is pressed into them. In this butt jointing operation, for example, the four main reinforcing bars 25a of the precast member 2, which has been lifted by a hoisting machine, are inserted into the joint parts 18a of the mechanical joint 18 of the precast member 1 that has already been installed.

[0038] Then, as shown in Figure 5, the connecting plate B1 is placed against the side surface of the foundation beam sections 15 and 25, and the connecting plate B1 is fixed to the foundation beam sections 15 and 25 with bolts or the like. In addition, at the portion of the upper surface of the foundation beam sections 15 and 25 that is separated from the parapet sections 17 and 27, the pre-formed sealing material 5, which is attached adjacent to the protruding parts 12 and 22 on the upper edge side, seals the liquid grout 3.

[0039] Next, liquid grout 3 is introduced between the joint surfaces 11 and 21. For the introduction of this liquid grout 3, a pipe is inserted into one of the eight resin pipes 18c designated for introducing liquid grout 3, and liquid grout 3 is sent out at a predetermined pressure from a hose connected to this pipe. Once the area between the joint surfaces 11 and 21 and the mechanical joint 18 are filled with liquid grout 3, the liquid grout 3 overflows from the other seven resin pipes 18c, and the injection of liquid grout 3 is completed.

[0040] Furthermore, when introducing liquid grout 3 between the joint surfaces 11 and 21, a plug (wooden piece, cloth, etc.) 61 is inserted into the drain port 6 after the grout 3 has come out. This allows rainwater that has seeped in before the grout 3 is filled between the joint surfaces 11 and 21 (for example, rainwater may enter from the non-sealed part 51 described later) to be discharged from the drain port 6, and only grout 3 can be filled between the joint surfaces. If the drain port 6 is not provided, the grout 3 filled between the joint surfaces will have a higher specific gravity than water, so it will accumulate at the bottom of the joint surface, and the water will overflow from the resin pipe 18c first. However, this would necessitate using a large amount of grout 3 to ensure that all the water is completely drained, potentially wasting grout 3.

[0041] In this embodiment, as shown in Figure 6, a portion of the pre-formed sealing material 5 provided on the upper edge protrusions 12 and 22 of the joint surfaces 11 and 21 is interrupted to form a non-seal portion 51 for the grout 3. This makes it possible to adjust the grout filling speed while visually checking the state of grout filling between the joint surfaces 11 and 21 of adjacent precast members 1 and 2 at the non-seal portion 51. The non-seal portion 51 also functions as an air vent during grout filling. If grout 3 overflows from the non-seal portion 51, the liquid grout 3 can be sealed by stuffing cloth or the like into the non-seal portion.

[0042] Furthermore, if the precast members 1 and 2, with the standard sealant 5 already attached to the joint surfaces 11 and 21, are transported to the construction site where the precast members 1 and 2 are to be installed, the work of attaching the standard sealant 5 at the construction site becomes unnecessary, thus speeding up the construction process.

[0043] In addition, in precast members that do not have the footing portions 16 and 26 described above, a drainage opening can be formed by cutting off the lower end of the standard sealing material 5 without extending it laterally.

[0044] Although embodiments of this invention have been described above with reference to the drawings, this invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as this invention, or within the equivalent scope. [Explanation of Symbols]

[0045] 1: Precast members 2: Precast members 3: Grout 4: Vertical joints 5: Standard sealing material 6: Drain outlet 61: Stopper 11: Joint surface 12:Protrusion 15:Foundation beam part 15a: Main reinforcement 16: Footing section 17: Waist wall section 18: Mechanical couplings 18a: Fittings 18c: Resin piping 21: Joint surface 22:Protrusion 25:Foundation beam part 25a: Main reinforcement 26: Footing section 27: Waist wall section 100: Joint structure B1: Connection plate

Claims

1. A precast member having joint surfaces at both ends in the extension direction, wherein a vertical joint is formed on the joint surfaces by grout filling, and comprising: a protruding portion that extends vertically and continuously from the joint surface at least on the left and right edges of each joint surface at both ends; and a pre-formed sealing material attached adjacent to the protruding portion on the grout filling area side on at least one of the joint surfaces.

2. A precast member according to claim 1, characterized in that the protruding portion and the standard sealing material extend to the upper edge side of the joint surface, while a portion of this upper edge side is a non-sealing portion for the grout.

3. A precast member according to claim 1 or claim 2, characterized in that the protruding portion and the standard sealing material are interrupted at the lower end of one of the left and right edges, thereby forming a drainage opening.

4. A precast member according to claim 1 or claim 2, comprising at least a foundation beam portion and a footing portion extending laterally from the lower part of the foundation beam portion, wherein reinforcing bars protrude from one joint surface of the foundation beam portion, and a mechanical joint is embedded on the other joint surface side of the foundation beam portion to connect reinforcing bars protruding from the joint surface of an adjacent precast member.

5. A precast member according to claim 4, wherein the protrusion extends outward through the footing portion on the lower side of one of the left and right edges, the lower end of the standard sealing material located on that one edge side extends laterally outward adjacent to the lateral protrusion, and the lower end of the standard sealing material located on the other edge side of the left and right edges also extends laterally outward, and the outer ends between these laterally extended standard sealing materials are provided as drainage openings.

6. A joint structure for precast members, wherein a vertical joint is formed by filling the joint surfaces of adjacent precast members with grout, using a precast member according to any one of claims 1 to 5, A joint structure for precast members, characterized in that the above-mentioned standard sealing material is pressed against the above-mentioned joint surfaces by butting them together.

7. A method for creating a joint structure by joining precast members according to claim 1, claim 2, or claim 4, The process involves butting the joint surfaces of adjacent precast members together with the above-mentioned standard sealant in place, and pressing the standard sealant against them. The step of filling the gap between the above-mentioned joint surfaces with grout, A method for manufacturing a joint structure for precast members, characterized by including [a specific element].

8. A method for creating a joint structure by joining precast members according to claim 3 or claim 5, The process involves butting the joint surfaces of adjacent precast members together with the above-mentioned standard sealant in place, and pressing the standard sealant against them. The step of filling the gap between the above-mentioned joint surfaces with grout, After the grout comes out of the drain port, the next step is to plug the drain port. A method for manufacturing a joint structure for precast members, characterized by including [a specific element].

9. A method for manufacturing a joint structure for a precast member according to claim 7 or claim 8, characterized in that the precast member with the standard sealant already attached is transported to the construction site where the precast member is to be installed.

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