JPH07217001A - Precast structure - Google Patents

Abstract

PURPOSE:To simplify a charging work of a grouting material into joints of a precast structure and reduce the construction time, on joining respective precast structures together. CONSTITUTION:Precast structures 1A, 1B are constituted of a plurality of joints 12 and reinforcements 13 buried in concrete 11. A grout injection path 30 opened to the side face of the concrete 11 is connected to the Joints 12 (i) positioned at the initial end. Adjacent two joints 12 are connected to each other through a connection path 20. This path 20 is used for the path of grouting material 60. Air vent passes 40 opened to the side face of concrete 11 are connected to the upper ends of all joints 12. The filling condition of grouting material 60 into the inside space 12a of the joints 12 is confirmed with spillover of the grouting material from the openings of air vent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast structure in which a plurality of joints and reinforcing bars connected to the joints are embedded in concrete.

[0002]

2. Description of the Related Art For the purpose of facilitating work at construction sites,
Conventionally, a method of using a so-called precast structure such as a pillar, a beam, or a wall manufactured in advance in a factory or the like and assembling it on site has been adopted. Such a precast structure is constructed by embedding a plurality of reinforcing bars and joints in concrete. Taking the case of a pillar as an example, the joint has a lower end opening to the lower end surface of concrete and a lower end of a reinforcing bar connected to the upper end. The upper end of this reinforcing bar projects from the upper end surface of the concrete.

When the precast structures as described above are connected to each other, a reinforcing bar protruding from the upper end surface of one (lower) precast structure is inserted into the joint of the other (upper) precast structure. Then, these precast structures are aligned with each other through a laying mortar, and in this state, the joint is filled with grouting material such as mortar or cement paste, and the precast structures are connected by hardening of the grouting material.

The grout material is injected from the side surface of the precast structure. That is, each joint is provided with a connection port at the lower end and the upper end, respectively, the connection port at the lower end is connected to one end of the grout injection passage, and the connection port at the upper end has one end of the air vent passage. It is connected. The other ends of the grout injection passage and the air vent passage are opened to the side surface of the concrete. Then, the grout material is injected from the grout injection passage into the inner space of the joint for each joint, and the injection of the grout material is stopped when it is confirmed that the grout material is discharged from the opening of the air vent passage.

[0005]

However, in the above-mentioned precast structure, since it is necessary to individually inject the grout material into the plurality of joints, there is a problem that the grout material filling operation is complicated and takes time. there were.
Therefore, an object of the present invention is to provide a precast structure that can simplify the filling work of grout material and can shorten the time for the filling work.

[0006]

In order to achieve the above object, in the invention of claim 1, concrete and a plurality of tubular joints and reinforcing bars embedded in the concrete are provided, and one end side of the joint is one end surface of the concrete. Precast structure in which the inner space is used as a grout filling space, one end of the reinforcing bar is connected to the other end of the tubular joint, and the other end of the reinforcing bar projects from the other end surface of the concrete The body is provided with a communication passage that connects the joints to each other. The invention of claim 2 is characterized in that the communication passage is formed in concrete. In the invention of claim 3, the communication passage is
It consists of a pair of auxiliary passages formed in concrete and a pipe that connects these auxiliary passages. The pair of auxiliary passages are connected to two joints each having one end, and the other end is opened to the side surface of the concrete. Both ends of the pipe are connected to the other end openings. In the invention of claim 4, a plurality of the communication passages are provided independently of each other, and the plurality of joints are connected in series by connecting the adjacent joints to each other. In the invention of claim 5, among the plurality of joints communicated by the communication passage, the joint located at the start end of the joint has two connection ports connected to the internal space at the lower portion, and at the end of the joint. The joint located at the bottom has one connection port connected to the internal space, the joint located at the middle has two connection ports connected to the internal space at the bottom, and the connection of the joint located at the beginning of the connection. One of the ports is connected with a grout injection passage opening on the side of the concrete, the connection ports of adjacent joints are connected by the communication passage, and further, the upper part of all joints is connected to the internal space. Connection ports are provided, and air vent passages that open to the side surface of the concrete are connected to these upper connection ports, respectively. In the invention of claim 6, the joint has one connection opening in the upper portion and one connection opening in the lower portion, and the connection opening at the lower portion of the connection located at the start end of the connection has a concrete side surface. An open grout injection passage is connected, and an air vent passage open to the side surface of concrete is connected to the connection port at the top of the joint located at the end of the above-mentioned connection. The connection port on the upper side of the joint and the connection port on the lower side of the other joint on the terminal side are connected by the communication passage.

[0007]

According to the precast structure of the first aspect, when the grout material is injected into one joint, the grout material is also injected into the other joint through the communication passage. Therefore, it is not necessary to individually fill the plurality of joints with the grout material, and the grout material filling operation can be simplified and the working time can be shortened. According to the precast structure of the second aspect, since the communication passage is formed inside the concrete, it is possible to reliably fill the grout material without breaking the communication passage. According to the precast structure of claim 3, since the external pipe also forms a part of the communication passage, when the clogging of the grout material occurs, the pipe is removed or broken to fill the grout material from the pipe. be able to. According to the precast structure of the fourth aspect, since the joints are connected in series, the structure of the communication passage can be simplified. According to the precast structure of claim 5, since the lower portions of the joints are communicated with each other, the grout material is injected from one joint, but the air is exhausted and the grout material is checked for overflow for all the joints. Since it is performed, it is possible to reliably perform the work of filling the grout material. According to the precast structure of claim 6, the number of the air vent passages in the series of joints is one, and the completion of the filling of the grout material can be confirmed by confirming the overflow of the grout material from the air vent passages. Good. This is particularly effective when the grout material has a low viscosity.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows two precast structures 10 according to the first embodiment.
The connection work state of A and 10B is shown. These precast structures 10A and 10B have a substantially rectangular parallelepiped shape,
For example, it is used as a pillar. Since the precast structures 10A and 10B have the same structure, only the upper precast structure 10A will be described, and the lower precast structure 10B will be denoted by the same reference numeral and description thereof will be omitted.

The precast structure 10A comprises concrete 11 and, for example, 8 embedded in the concrete 11.
Tubular joints 12 and eight longitudinally extending rebars 1
3 and 3. The bottom end of the joint 12 is concrete 1
1 is opened at the lower end surface and the inner space thereof is provided as a grout filling space 12a. The lower end of the reinforcing bar 13 is the joint 1
2 is connected to the upper end side. In the present embodiment, a male screw is formed on the outer circumference of the reinforcing bar 13, and a female screw is formed on the inner circumference of the upper end portion of the joint 12, and the two are connected by screwing. This threaded connection is strengthened by tightening the lock nut 14. The upper end of the reinforcing bar projects from the upper end surface of the concrete 11. Only the protruding end 13a of the reinforcing bar 13 of the lower precast structure 10B is shown in FIG. Although not shown, the reinforcing bar is a deformed reinforcing bar having no screw, and penetrates an annular seal member mounted on the inner periphery of the upper end of the joint 12 to allow the grout filling space 12a.
You may connect so that it may face the upper half.

The eight joints 12 are connected in series by seven communicating passages 20 formed in the concrete 11 independently of each other. Here, the joint 12 will be described with reference numerals (i) to (viii) according to the order of this connection, that is, the order of grout filling described later. More specifically, the joint 12 (i) located at the beginning (first) of the series and the second to the seventh located at the middle of the series.
At the lower ends of the thirteenth joints 12 (ii) to (vii), there are two connection ports 12x, 12y communicating with the internal space 12, respectively.
Are formed. The connection ports 12x and 12y are joints 12.
90 ° or 180 ° apart from each other, depending on the position of the arrangement. Then, in the two adjacent joints 12, the connection port 12y of the joint 12 on the starting end side and the joint 12x on the terminating end side are communicated with each other by a communication passage 20 formed by a pipe made of a vinyl chloride resin embedded in the concrete 11. Note that the joint located at the end, that is, the eighth joint 12 in the above series
(Viii) has only one connection port 12x at the lower end and communicates with this connection port 12x and the connection port 12y of the seventh joint 12 (vii) via the communication passage 20.

Connection port 12 of the first joint 12 (i)
One end of a grout injection passage 30 formed by a vinyl chloride resin pipe embedded in the concrete 11 is connected to x. The other end of the grout injection passage 30 is open to the side surface of the concrete 11.

Each of the joints 12 is formed with a connection port 12z which is continuous with the upper end of the internal space 12a, and one end of an air vent passage 40 formed by a vinyl chloride resin pipe is connected to the connection port 12z. . The other end of the air vent passage 40 is open to the side surface of the concrete 11.

Next, the precast structures 10A and 10B
A method for connecting the two will be described in order.
First, as shown in FIG. 1, the lower precast structure 1
A mortar 50 of a predetermined thickness is laid on the upper end surface of the 0B concrete 11, and the upper precast structure 10 is laid on the mortar 50.
Place A. At this time, the lower precast structure 10
The protruding end portions 13a of the B reinforcing bars 13 are respectively inserted into the internal spaces 12a of the joints 12 of the upper precast structure 10A.

With the mortar 50 hardened and the lower end opening of the joint 12 of the upper precast structure 10A closed, a grout material 60 such as mortar or cement paste is injected from the grout injection passage 30.
Then, all the joints 12 are filled with the grout material 60 via the communication passage 20. Here, the air bleeding of the internal spaces 12a associated with the filling of the grout material 60 is performed through the air bleed passages 40 that are in communication with the internal spaces 12a of all the joints 12.

The operator visually confirms the overflow of the grout material 60 from the air vent passage 40 connected to each joint 12,
Stop the injection of grout material 60. The opening of the air vent passage 40 where the grout material 60 overflows is plugged. When the viscosity of the grout material 60 is low, the overflows occur almost at the same time. However, when the viscosity is high, the joint 12 (i) at the starting end overflows from the air vent passage 40 the earliest, and the joint 12 (viii) at the end end vents. Overflow from 40 is the slowest. As described above, by hardening the grout material 60 filled in the internal space 12a of the joint 12, the upper and lower rebars 13 are connected to each other via the joint 12, and thus the precast structure 10A,
10B will be connected.

According to the first embodiment described above, the grout material 60 can be filled into the inner spaces 12a of all the joints 12 by only injecting the grout material 60 from one grout injection passage 30. The filling work can be simplified and the working time can be shortened. Further, since the air vent passages 40 are provided in all the joints 12, it is possible to grasp the filling state of each joint 12 and perform reliable filling.

FIG. 3 and FIG. 4 show a connecting state of the precast structure according to the second embodiment of the present invention. In the second embodiment, the description will focus on the parts that are different from the first embodiment,
Descriptions of common configurations are omitted. All the joints 12 have one connection port 12x ′ that connects to the lower end of the internal space 12a and one connection port 12y ′ that connects to the upper end of the internal space 12b. First joint 12 (i)
The connection port 12x ′ at the lower end of is connected to the grout injection passage 30 described above. The connection port 12y ′ at the upper end of the eighth joint 12 (viii) is connected to the air vent passage 40. Between the two adjacent joints 12, the connection port 12y ′ at the upper end of the joint 12 on the start end side is connected to the joint 12 on the end end side.
Is connected to the connection port 12x ′ at the lower end of the via a communication passage 70. Therefore, the most different point from the first embodiment is that in this embodiment, no air vent passage is connected for each joint 12, and a single air vent passage 40 is provided in the series of joints 12.
Is only formed.

In the above structure, the grout injection passage 30
The grout material 60 injected from the first is the first joint 1
After filling the inner space 12a of No. 2 and this filling is completed,
Next, the inner space 12a of the second joint 12 is filled via the communication passage 70. In this way, the inner space 12a of the joint 12 is sequentially filled, and finally the eighth joint 13 is filled.
After filling the internal space 12a of (viii), it overflows from the air vent passage 40. The operator stops the injection work of the grout material 60 by confirming the overflow of the grout material 60 from the only air vent passage 40.

In the second embodiment, it is possible to confirm the overflow of the grout material 60 at one place, so that the workability can be further improved. In addition, in this embodiment, the path through which the grout material 60 flows is long, and therefore it is particularly effective when the viscosity of the grout material 60 is low. In addition, in the second embodiment, the grout injection passage 30
And the air vent passage 40 opens on one surface (left surface in FIG. 4) of the precast structure 10A,
Since the grout material injection work position and the overflow check position can be made equal, workability can be further improved. Moreover, if the side face where the grout injection passage 30 and the air vent passage 40 are opened is inside the building, it is possible to ensure the safety of the worker.

In the first and second embodiments described above, since the communication passages 20 and 70 are formed in the concrete, there is no risk of damage and the grout material filling operation can be ensured. 5 and 6 from another point of view.
The communication passages of different modes may be configured as shown in FIG. The third embodiment of FIG. 5 is similar in basic structure to the first embodiment.
The difference is that a communication passage 80 for communicating the adjacent joints 12 is composed of a pair of auxiliary passages 81 formed in the concrete 11 and a pipe 82 arranged outside the concrete 11 connecting the auxiliary passages 81. It is the point that is configured. One end of each auxiliary passage 81 is connected to the connection ports 12x and 12y at the lower end of the joint 12, and the other end is open to the side surface of the concrete 11. A pipe 82 is connected to the open ends of the pair of auxiliary passages 81. In this embodiment, the grout material will flow through the auxiliary passage 81 and the pipe 82. In this embodiment, when the grout material is clogged, the pipe 82 can be pulled out or broken to fill the grout material. The filling state of the grout material can be grasped by making this pipe transparent or translucent.

The fourth embodiment of FIG. 6 is similar in basic structure to the second embodiment. A different point is that a communication passage 90 for communicating the adjacent joints 12 has a pair of auxiliary passages 91 and 92 formed in the concrete 11 and these auxiliary passages 9
It is composed of a pipe 93 arranged outside the concrete 11 for connecting 1, 92. One end of one auxiliary passage 91 has a connection port 1 at the upper end of the joint 12 on the starting end side.
2y 'and the other end is open to the side surface of the concrete 11. One end of the other auxiliary passage 92 is connected to the connection port 12x ′ at the lower end of the joint 12 on the terminal side, and the other end is open to the side surface of the concrete 11. Both ends of the pipe 93 are connected to the open ends of the pair of auxiliary passages 91 and 92. The advantage of using the pipe 93 is the same as that of the third embodiment.

The present invention is not limited to the above-mentioned embodiment, and various modes are possible. For example, in all the above examples,
Although all the joints of the precast structure are communicated in series, the joints may be divided into a plurality of groups independent of each other, and the joints may be communicated in each group. Further, only the joints of some groups may be communicated.

[0023]

As described above, according to the invention of claim 1, by injecting the grout material into one joint, the grout material is also injected into the other joints through the communication passage. As a result, it is possible to simplify the filling work of the grout material and shorten the working time. According to the invention of claim 2,
Since the communication passage is formed inside the concrete, it is possible to reliably fill the grout material without breaking the communication passage. According to the invention of claim 3, since the external pipe also forms a part of the communication passage, when the grout material is clogged, the grout material can be filled from the pipe by removing or breaking the pipe. it can. According to the invention of claim 4, since the joints are connected in series, the structure of the communication passage can be simplified. According to the invention of claim 5, the discharge of air and the confirmation of the overflow of the grout material are performed for all the joints, so that the grout material filling operation can be reliably performed. According to the invention of claim 6, it is possible to confirm the completion of the filling of the grout material at the plurality of joints by confirming the overflow of the grout material from one air vent passage.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a connecting work state of a precast structure according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line XX in FIG.

FIG. 3 is a vertical sectional view showing a connecting work state of a precast structure according to a second embodiment of the present invention.

4 is a cross-sectional view taken along the line YY in FIG.

FIG. 5 is a front view showing a connecting work state of a precast structure according to a third embodiment similar to the first embodiment of the present invention.

FIG. 6 is a front view showing a connecting work state of a precast structure according to a fourth embodiment similar to the second embodiment of the present invention.

[Explanation of symbols]

10A, 10B ... Precast structure 11 ... Concrete 12 ... Joint 12a ... Internal space 12x, 12y, 12z, 12x ', 12y' ... Connection port 13 ... Reinforcing bar 20 ... Communication passage 30 ... Grout injection passage 40 ... Air vent passage 60 ... Grout Material 70, 80, 90 ... Communication passage 81, 91, 92 ... Auxiliary passage 82, 93 ... Pipe

Claims (6)

[Claims] 1. A concrete, comprising a plurality of tubular joints and rebars embedded in the concrete, one end side of the joint being opened to one end face of the concrete, and the inner space thereof being used as a grout filling space, and one end of the rebar A part is connected to the other end side of the tubular joint, and the other end of the reinforcing bar is configured to project from the other end surface of the concrete, in a precast structure, characterized by comprising a communication passage connecting the joints to each other. Precast structure. 2. The precast structure according to claim 1, wherein the communication passage is formed in concrete. 3. The communication passage comprises a pair of auxiliary passages formed in concrete and a pipe connecting the auxiliary passages, and the pair of auxiliary passages are adjacent to each other at one end thereof.
The precast structure according to claim 1, wherein the precast structure is connected to each of the two joints, the other end of each pipe is opened on a side surface of the concrete, and both ends of the pipe are connected to the other end openings. 4. A plurality of the communication passages are provided independently of each other, and each communication passage communicates with an adjacent joint,
The precast structure according to claim 1, wherein a plurality of joints are connected in series. 5. Among the plurality of joints communicated by the communication passage, the joint located at the start end of the joint has two connection ports connected to the internal space at the lower portion, and is located at the end of the joint. The joint has one connection port connected to the internal space at the lower portion, and the joint located in the middle has two connection ports connected to the internal space at the lower portion, and the connection port of the joint located at the starting end of the connection is One is connected to the grout injection passage opening to the side surface of the concrete, the connection port of the adjacent joint is communicated by the communication passage, further,
The connection port which connects to the said internal space is provided in the upper part of all the joints, and the air vent passage which opens to the side surface of concrete is each connected to these upper connection ports. Precast structure of. 6. The joint has one connection opening at the top and one connection at the bottom, connecting to the internal space, and the connection opening at the bottom of the connection located at the starting end of the connection is open to the side surface of concrete. The grout injection passage is connected,
At the connection port at the top of the joint located at the end of the above series,
An air vent passage open to the side surface of concrete is connected, and in an adjacent joint, an upper connection port of one joint on the start end side and a lower connection port of the other joint on the end side are connected by the communication passage. The precast structure according to claim 4, wherein: