JP2732439B2 - Joint construction method for precast structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint construction method for installing a precast structure on a floor.

[0002]

2. Description of the Related Art A precast structure used for a pillar, a wall or the like is constructed by embedding a plurality of sleeve joints and a plurality of reinforcing bars in concrete. The sleeve joint has an internal space for filling grout and has a lower end opening to the lower surface of the concrete. The rebar has a lower end connected to the upper end of the sleeve joint and an upper end protruding from the concrete. In the internal space of each sleeve joint,
One end of a horizontally extending communication hole is continuous, and the other end of the communication hole is open to the side surface of the concrete.

[0003] The precast structure is installed on a floor surface on which a reinforcing bar projects upward. In this installation state, in the internal space of the sleeve joint of the precast structure,
Reinforcing bars projecting from the floor are accommodated, and joint spaces are formed between the lower surface of the precast structure and the floor. The joint space is surrounded by a mold placed on the floor surface, and grout is injected from at least one of the communication holes to fill the interior space of the sleeve joint and the joint space with grout.

Conventionally, the form surrounding the joint space has been formed of a metal angle material. This angle lumber is
One flat plate portion is fixed to the floor surface with nails or screws while the other flat plate portion is in contact with the side surface of the precast structure.

[0005]

When the metal angle member is used as a mold, there are the following drawbacks. First, due to the unevenness of the floor surface and the distortion of the angle material itself, the sealing between them is insufficient, and there is a possibility that the grout will leak from between the two when grout is injected. Second, the work of fixing the angle material to the floor surface with nails and screws before grout filling and the work of removing the angle material by removing the nails and screws after grout hardening have been troublesome.

[0006]

In order to solve the above-mentioned problems, in the invention of claim 1, a mold is formed of wood, and a plurality of the communication holes which are opened at positions circumferentially separated from the precast structure are provided. It is characterized in that rods are inserted, these rods are projected horizontally from the side surfaces of the precast structure, and wedges are driven between these rods and the formwork to fix the formwork to the floor surface. According to the second aspect of the present invention, the cross section of the precast structure has a rectangular shape, and the planar shape of the mold has a rectangular shape corresponding to the rectangular shape. At least one opening is provided on the side surface, and at least one rod and wedge are provided on each side surface. The invention according to claim 3 is characterized in that the rod has a through-hole extending in the axial direction and has a pipe shape. Claim 4
In the invention, the wedge has a horizontal lower surface in contact with the formwork, a slope, and a horizontal upper surface connected to the slope, and the rod is positioned on the horizontal upper surface of the wedge by the wedge driving. It is characterized by.

[0007]

According to the first aspect of the present invention, when a wedge is struck between the rod and the formwork and the formwork is pressed against the floor surface, the formwork is made of wood, which corresponds to the unevenness of the floor surface. The formwork is adhered to the floor. As a result, the sealing property of the joint space is improved, and when the grout is filled in the joint space, it is possible to suppress or prevent leakage from between the two. In addition, before filling the grout, the mold can be fixed by driving the wedge. After the grout is hardened, the mold can be removed simply by hitting and removing the rod or the wedge, thereby improving workability. According to the second aspect of the present invention, it is possible to improve the sealing property of the joint space by making each part of the formwork along the four side surfaces of the precast structure having a rectangular cross section adhere to the floor surface by using wedges. it can. According to the third aspect of the present invention, since the rod inserted into the communication hole has a through hole, grout can be injected from this through hole, and when grout is filled from another communication hole, Then, it can be confirmed that the grout filling in the sleeve joint has reached a predetermined height due to the leakage of the grout material from the through hole.
According to the fourth aspect, the rod is positioned on the horizontal upper surface connected to the slope by the wedge driving, so that the state in which the form is pressed against the floor can be stably maintained.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a pillar precast structure 10 is composed of a plurality of (12 in this embodiment) sleeve joints 12 extending vertically and a plurality of vertically extending sleeve joints 12 connected to the sleeve joint 12. Reinforcing bar 13
And are buried. As shown in FIG. 3, the precast structure 10 has a square cross section,
Sleeve joints 12 are disposed at approximately equal intervals along the four sides.

As shown in FIG. 1, each sleeve joint 12 is disposed at the lower end of the precast structure 10. The lower end of the sleeve joint 12 is open to the lower surface of the precast structure 10. In this embodiment, the sleeve joint 1
The lower end surface of 2 is flush with the lower surface of the precast structure, but may be located higher than this. The sleeve joint 12 has an internal space 12a filled with grout as described later. A connection port 12b is formed on the peripheral wall of the sleeve joint 12 at a predetermined distance above the lower end, and a connection port 12c is formed to be continuous with the upper end of the internal space 12a.

[0010] As shown in FIG.
One ends of polyvinyl chloride pipes 15 and 16 embedded in the concrete 11 are connected to the connection ports 12b and 12c. These pipes 15, 16 extend horizontally,
It is open on the side of the concrete 11. The internal spaces of these pipes 15, 16 are provided as a communication hole 15a and an air discharge port 16a, respectively. As shown in FIG. 3, among the four side surfaces 11a and 11c of the concrete 11 of the precast structure 10, four communication holes 15a are opened at equal intervals from each other.
On the other two side surfaces 11b and 11d, two communication holes 15a are opened apart from each other. As shown in FIGS. 1 and 2, the air discharge hole 16a is disposed right above the communication hole 15a.

The rebar 13 used in this embodiment is called a threaded rebar, and has a thread (not shown) on the outer peripheral surface. As shown in FIG. 1, the lower end of the reinforcing bar 13 is screwed into a screw hole 12 x at the upper end of the sleeve joint 12.
It is connected to the sleeve joint 12. The upper end (not shown) of the reinforcing bar 13 projects from the upper surface of the concrete 11 of the precast structure 10.

On the other hand, a plurality (12 in this embodiment) of reinforcing bars 21 project vertically upward from the floor surface 20 on which the precast structure 10 is installed. These reinforcing bars 21 are reinforcing bars extending from the column precast structure on the lower floor. By pouring concrete on the upper part of the column precast structure on the lower floor, the floor surface 20
Are formed.

Next, a joint construction method for installing the precast structure 10 on the floor 20 will be described. The precast structure 10 is placed on the floor 20 with a plurality of spacers (not shown) arranged between the lower end surface of the precast structure 10 and the floor 20. Thereby, the joint space 30 having a height corresponding to the spacer is formed. In order to secure the height of the joint space 30, a plurality of protrusions may be formed on the lower surface of the precast structure 10. Also,
In this installation state, the reinforcing bar 21 protruding from the floor surface 20 enters the internal space 12 a of the sleeve joint 12.

Next, as shown in FIG. 1, a wooden frame member 41 extending straight and having a rectangular cross section is placed on the floor surface 20 so as to contact the four side surfaces 11a to 11d of the precast structure 10. Thus, a rectangular mold 40 is formed as shown in FIG. The joint space 30 is enclosed and closed by the formwork 40. The frame members 41 are independent of each other and are not connected.

Around the time when the formwork 40 is installed, a polyvinyl chloride pipe 45 is inserted into the two communication holes 15a opened on the side surfaces 11b and 11d of the concrete 11, respectively.
(A rod having a through hole 45a),
Four communication holes 15 opened on each of the side surfaces 11a and 11c
The pipes 45 are inserted into two of the pipes a, and these pipes 45 are projected horizontally from the side surfaces 11a to 11d.

Next, a wooden wedge 46 is driven horizontally between each pipe 45 and the frame member 41. As shown in FIG. 2, the wedge 46 is provided on the horizontal lower surface 4 in contact with the horizontal upper surface of the frame member 41.
6a, a slope 46a intersecting with the lower surface 46a, and a horizontal upper surface 46c continuous with the slope 46a.
When the wedge 46 is driven, the wedge 46 is
Since b moves while being in contact with the pipe 45, a downward component force can be obtained, whereby the frame member 41 can be pressed against the floor surface 20. Since each frame member 41 is made of wood, it is bent by this pressing force, and even if the floor surface 2
Even if there is a swell (unevenness) at 0, it can adhere to the floor surface 20. In addition, since the side surface of the concrete 11 of the precast structure 10 is a relatively good flat surface, the frame member 41 can be brought into contact with no gap.
As a result, the joint space 30 can be reliably sealed.

In this embodiment, two pipes 45 and two wedges 46 are arranged on each frame member 41 and pressed with two points of force apart from each other, so that the frame member 41 can be pressed almost evenly. The adhesion between the floor 41 and the floor 41 can be further enhanced. In addition, since the formwork 40 is fixed by driving the wedge 46 as described above and an operation such as nailing is not required, the work of fixing the formwork 40 is simple.

Next, from one selected pipe 45,
Inject grout. As a result, the grout enters the joint space 30 via the internal space 12a of one sleeve joint 12 which is in communication with the pipe 45. When the grout filling of the joint space 30 is completed, the grout starts to be filled in the internal spaces 12a of all the sleeve joints 12.
When the grout reaches the height of the pipe 45 or the communication hole 15a which is not used for grout injection, leakage starts from the pipe 45 or the communication hole 15a. For this reason, the operator can confirm that the grout has been filled up to the predetermined height of the internal space 12a of the sleeve joint 12. This leakage of grout is stopped by plugging the pipe 45 or the communication hole 15a. When grouting is further continued, the grout eventually becomes the internal space 12a of the joint 12.
And leaks out from the air discharge hole 16a. The operator thereby confirms the completion of filling, ends the grout injection work, and plugs the air discharge hole 16a.

The hardening of the grout in the joint space 30 forms the joint, and the hardening of the grout in the sleeve joint 12 causes the reinforcing bar 21 projecting from the floor surface 20.
Is connected to the reinforcing bar 13 of the precast structure 10. When the grout has hardened, the pipe 45 is hit with a hammer to remove it from the communication hole 15a, and the wedge 45 and the frame member 41 are removed. Note that the wedge 45 may be first hit with a hammer and removed from between the pipe 45 and the frame member 41. This formwork 4
The work of removing the “0” is extremely simple because it does not require any work such as nail removal.

The present invention is not limited to the above embodiment, and various embodiments are possible. For example, in the above embodiment, pipes may be inserted into all the communication holes, and wedges may be driven between these pipes and the mold. In the above embodiment, grout may be injected from a communication hole into which a pipe is not inserted. A solid rod may be used instead of a pipe. In this case, grout is injected from the communication hole into which the rod is not inserted. Further, a solid rod and a pipe may be used in combination. In some of the sleeve joints, the communication holes may not be in communication. The precast structure may be a wall.

[0021]

As described above, according to the first aspect of the present invention, by using the wooden formwork, the rod and the wedge, the adhesion between the formwork and the floor surface can be improved, and the joint space can be reduced. The sealing property can be improved, and the leakage of grout from between them can be suppressed or prevented. Further, the work of fixing the mold before filling the grout into the joint space and the work of removing the mold after grout hardening can be simplified. According to the second aspect of the present invention, when a precast structure having a rectangular cross section is used, the adhesion of the formwork to the floor can be enhanced. According to the third aspect of the present invention, since the rod inserted into the communication hole has a through hole, grout can be injected from this through hole, and when grout is filled from another communication hole. Then, it can be confirmed that the grout filling in the sleeve joint has reached a predetermined height due to the leakage of the grout material from the through hole. According to the fourth aspect of the invention, the rod is positioned on the horizontal upper surface connected to the slope, so that the state in which the formwork is pressed against the floor surface can be stably maintained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a joint execution method of the present invention, in which a precast structure is installed on a floor surface and a joint space is immediately filled with grout.

FIG. 2 is a front view showing the same state.

FIG. 3 is a transverse sectional view taken along line III-III in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Precast structure 11 ... Concrete 12 ... Joint 12a ... Internal space 13 ... Reinforcing bar 15a ... Communication hole 20 ... Floor surface 21 ... Reinforcing bar 30 ... Joint space 40 ... Formwork 45 ... Pipe (rod) 45a ... Through hole 46 ... Wedge 46a: the lower surface of the wedge 46b: the slope of the wedge 46c: the upper surface of the wedge

Claims (4)

(57) [Claims] A plurality of sleeve joints and a plurality of rebars are buried in concrete, the sleeve joints have an inner space for grout filling, a lower end portion is opened on a lower surface of the concrete, and a lower end portion of the rebars is formed. Prepare a precast structure that is connected to the upper end of the sleeve joint, and further has a communication hole that extends horizontally and opens to the side of the concrete, and this precast structure is installed on the floor surface. , While accommodating a plurality of rebars projecting upward from the floor in the internal space of the sleeve joint of the precast structure,
A joint space is formed between the lower surface of the precast structure and the floor surface, the joint space is surrounded by a mold placed on the floor surface, and grout is injected from at least one of the communication holes to form a sleeve joint. A joint construction method for a precast structure in which grout is filled in an internal space and a joint space of the precast structure, wherein the form is formed of wood, and the plurality of communication holes which are opened at positions separated in a circumferential direction of the precast structure. A precast structure characterized by inserting rods, projecting these rods horizontally from the side of the precast structure, and driving a wedge between these rods and the formwork to fix the formwork to the floor. Joint construction method. 2. The cross section of the precast structure is rectangular, and the plane shape of the mold is correspondingly rectangular in shape, and the communication holes into which the rods are to be inserted are formed on each side surface of the precast structure. The joint construction method for a precast structure according to claim 1, wherein at least one opening is provided, and at least one of the rod and the wedge is disposed on each side. 3. The joint construction method for a precast structure according to claim 1, wherein the rod has a through hole extending in an axial direction and has a pipe shape. 4. The wedge has a horizontal lower surface in contact with a mold,
It has a slope and a horizontal upper surface connected to the slope,
The joint construction method for a precast structure according to claim 1, wherein the rod is positioned on a horizontal upper surface of the wedge by the wedge driving.