JPH08326357A - Molding method for pc pipe and connecting part structure for unit pc pipe - Google Patents

Abstract

PURPOSE: To provide a PC pipe which can be easily conveyed and installed by protruding a PC steel rod from an end part of a unit concrete PC pipe formed into a short length one and connecting the unit PC pipes together to the predetermined length via a joint in a field. CONSTITUTION: Cylindrical concrete PC pipes (unit pipes) 1, 2 in which PC steel rods 6, 7 are buried are formed so as to be provided with comparatively short, length, while recess parts 4, from which the PC steel rods 6, 7 are protruded, are arranged on their end faces. In a joint pipe 3, recess parts 5a, 5b, 5c, from which joint PC steel rods 9, 12, are protruded, are arranged. Then, a plurality of unit PC pipes 1, 2, 3 are conveyed to a field, the PC steel rods 6, 7, 9, 12 are connected to each other by means of couplers 10, fixing nuts 11, and the like, prestress is introduced, and the unit PC pipes are sequently jointed to the predetermined length. If diameters of the unit pipe 1, 2 are equal to each other, a different joint pipe 3 is used for connection. In this way, the concrete PC pipe can be easily installed even in a place into which a long object is difficult to be conveyed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of molding a PC tube composed of a plurality of unit PC tubes molded in a cylindrical shape, and a joint structure of the unit PC tubes.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
Posts that are erected for power transmission or wireless (Fig. 6)
In the reference), a steel pipe concrete pillar or a concrete pillar formed by filling concrete into a steel pipe, or a steel pillar is used.

However, since the steel pipe concrete pillars or concrete pillars are molded to a length of several meters and are extremely bulky, it is necessary to carry them by a large vehicle to the site, and especially when carrying them into urban areas, people need to carry them. There were issues such as having to pay close attention to traffic. Further, since the size and shape are standardized and the length is almost fixed, there is a problem that the length cannot be changed at all.

The present invention has been made to solve the above problems, and can easily mold a PC pipe of a required length,
Moreover, it is an object of the present invention to provide a method of molding a PC tube and a structure of a joint portion of the unit PC tube, which enables easy molding of the PC tube and joining of the unit PC tubes.

[0005]

According to a first aspect of the present invention, there is provided a method for forming a PC pipe, wherein a plurality of unit PC pipes are inserted into concrete of the unit PC pipes in the axial direction thereof. It is characterized in that a plurality of PC steel rods are installed while being connected to each other.

According to a second aspect of the present invention, there is provided a joint structure for a PC pipe, comprising two unit PCs having different diameters to be joined.
A joint PC pipe having a joint end face having the same diameter as one unit PC pipe at one end and a joint end face having the same diameter as the other unit PC pipe at the other end is installed between the pipes, and the joint P pipe
It is configured by joining a plurality of PC steel rods, which are respectively inserted into the concrete of the C pipe and the unit PC pipe, into each other.

According to a third aspect of the present invention, there is provided a joint structure for PC pipes according to the second aspect, which is the joint structure for PC pipes according to the second aspect. Insert each of the PC steel rods of
The steel rod is joined by a coupler installed in a recess formed in the joint end surface of the joint PC pipe.

According to a fourth aspect of the present invention, there is provided a joint structure for a PC pipe according to the first aspect of the present invention, wherein the unit PC pipe is formed into a cylindrical shape, and It is configured by forming a plurality of holes, through which PC steel rods are inserted, in concrete in the direction of the material axis.

According to a fifth aspect of the present invention, there is provided a joint structure for a PC pipe according to the second or third aspect, wherein the unit PC pipe is formed into a cylindrical shape. ,
In addition, it is configured by forming a plurality of holes, through which PC steel rods are inserted, in the surrounding concrete in the material axis direction.

[0010]

1 to 8 show an embodiment of a method of molding a PC pipe and a joint structure of a unit PC pipe according to the present invention,
In the drawing, reference numeral 1 is a unit PC tube which is stacked in a plurality of stages while being joined to each other and constitutes a lower large-diameter portion a of the PC tube, 2
Is a unit PC that is stacked above the lower large diameter portion a while being stacked in a plurality of stages to form the upper small diameter portion b of the PC pipe.
The pipe 3 is installed between the lower large-diameter portion a and the upper small-diameter portion b, and constitutes a cross-section changing portion c between the lower large-diameter portion a and the upper small-diameter portion b. Tube ”) (see FIGS. 1 and 6).

Each of the unit PC tubes 1 and 2 is formed into a cylindrical shape by a so-called centrifugal molding method (see FIG. 2), and the unit PC tube 2 is a unit in order to reduce the weight of the upper small diameter portion b. The diameter is smaller than that of the PC pipe 1. Further, the lower end portion 3a of the joint pipe 3 is formed to have the same diameter as the single PC pipe 1, the upper end portion 3b is formed to have the same diameter as the single PC pipe 2, and the intermediate portion 3c thereof is formed to have a conical shape. (See Figure 1).

In the concrete around the unit PC pipes 1 and 2, a plurality of through holes 1a and 2a penetrating in the vertical direction are formed at predetermined intervals in the circumferential direction, and the lower ends of the through holes 1a and 2a. Recesses 4 having a larger diameter than the through holes 1a and 2a are formed in the portions at predetermined depths (see FIG. 1). In addition, through holes 3d penetrating in the vertical direction are formed in the concrete around the lower end 3a of the joint pipe 3 at predetermined intervals in the circumferential direction, and the through holes 3d are larger than the through holes 3d at both upper and lower ends. Recesses 5a and 5b having a diameter are formed at predetermined depths (see FIG. 4).

Reference numeral 6 is continuously inserted in the through hole 1a of each unit PC tube 1 in the vertical direction, and is connected to each other to integrally join a plurality of unit PC tubes 1 and to each other. PC to introduce prestress to PC tube 1
The steel rods 7 are continuously inserted vertically in the through holes 2a of each unit PC tube 2 and are connected to each other to integrally join a plurality of unit PC tubes 2 together,
PC steel rods 8 for introducing prestress to the unit PC pipe 2 are couplers mounted in the recesses 4 respectively and joining the PC steel rods 6 and the PC steel rods 7 together (Fig. 3 (a), ( b)).

Reference numeral 9 is the lower end 3a of the joint pipe 3.
Of the PC steel rod 6 with the lower end 9a inserted into each of the through holes 3d.
And the upper end 9b is connected to the recess 5a of the joint pipe 3.
Joint PC steel rod fixed inside to join the unit PC pipe 1 and the joint pipe 3, 10 is the recess 5b of the joint pipe 3
A coupler, which is installed inside and connects the upper end of the PC steel rod 6 and the lower end of the joint PC steel rod 9, 11 is screwed to the upper end of the joint PC steel rod 9 in the recess 5a of the joint pipe 3, A fixing nut for fixing the upper end of the joint PC steel rod 9 in the recess 5a (see FIGS. 1 and 4).

Reference numeral 12 is embedded in the concrete of the upper end portion 3b of the joint pipe 3 at predetermined intervals in the circumferential direction of the joint 3, and the upper end portion is connected to the PC steel rod 7 to joint with the unit PC pipe 2. A joint unbonded PC steel rod for joining the pipe 3 and a coupler 13 installed in the recess 5c of the joint pipe 3 for connecting the lower end of the PC steel rod 8 and the upper end of the joint PC steel rod 12 ( (See FIGS. 1 and 5).

The through holes 1a and 2a of the unit PC tubes 1 and 2 are filled with a grouting material such as mortar so that P
The C steel rod 6 and the unit PC pipe 1 and the PC steel rod 6 and the unit PC pipe 2 are integrated.

FIG. 7 shows the structure of the base portion of a PC pipe constructed as a radio tower or the like. In the figure, reference numeral 14 is assembled from a steel material such as H-section steel and installed at the lower end of the PC pipe. , A base frame for supporting the PC pipe, 15 is attached to the lower end of the base frame 14,
Level adjusting bolts 16 for adjusting the level of the PC are attached to the periphery of the base frame 14 and are connected to the PC steel rods 6 inserted into the through holes 1a of the unit PC pipes 1, respectively.
Fixing PC steel rods that fix the lower ends of the steel rods 6 to the base frame 14, respectively, and reference numeral 17 is a basic concrete that is cast on the lower end portions of the PC pipes and integrally embeds the base frame 14 and the like.

In such a structure, a plurality of units P
PC for each of C tube 1 and unit PC tube 2
In order to connect the steel rods 6 and 7 to construct the entire length of the PC pipe, first, a new unit PC pipe 1 is placed on the unit PC pipe 1 already connected by the PC steel rod 6, and both of them are penetrated. Match holes 1a. Next, a new PC steel rod 6 is inserted into the through hole 1a of the unit PC tube 1, and the tip portion of the PC steel rod 6 is connected to the upper end portion of the PC steel rod 6 which is already installed via the coupler 10. The coupler 10 is preliminarily attached to the upper end portion of the PC steel rod 6 already installed. Next, the fixing nut 11 is fastened to the upper end portion of the PC steel rod 6 to fix the newly installed unit PC pipe 6 on the already installed unit PC pipe 1, and to the unit PC pipe 6. Introduce prestress. Thereafter, in the same manner, a plurality of unit PC pipes 1 are connected by PC steel rods 6 and sequentially added to construct the entire length of the lower large diameter portion a.

Next, the uppermost unit PC of the lower large diameter portion a
The joint PC pipe 3 is installed on the pipe 1, and the joint PC pipe 3 and the unit PC pipe 1 are jointed by the joint P.
It is connected by a C steel rod 9. Next, joint PC tube 3
A plurality of unit PC pipes 2 are sequentially installed on the above while being connected by PC steel rods 7 to construct an upper small diameter portion b.

[0020]

The effects of the present invention are set forth in Claims 1 and 5 of the present invention.
The method of molding a PC pipe as described in the item 1,
A PC pipe is formed by connecting a plurality of PC steel rods, which are respectively inserted in the axial direction of the unit PC pipe, in the concrete to form a PC pipe, and the unit PC pipe is formed into a cylindrical shape. In addition, since a plurality of holes, through which PC steel rods are inserted, are formed so as to pass through in the axial direction, the unit PC
The required number of PC pipes can be brought in to the site where the required number of PC pipes are installed, and by joining these unit PC pipes on site, the required length of PC pipes can be easily formed, and along with this, a long PC formed at the factory. It has the effect of eliminating the need to transport the pipe to the site.

Further, claim 2 and claim 3 according to the present invention
According to the joint structure of the PC pipes of the items 4 and 4, between the two unit PC pipes having different diameters to be joined, one end has a joint end face having the same diameter as one unit PC pipe, and the other end. The other unit P
A joint PC pipe having a joint end face with the same diameter as the C pipe is installed, and a plurality of PC steel rods respectively inserted into the concrete of the joint PC pipe and the unit PC pipe are joined to each other by joining the joint PC pipe. Since it is constructed by joining by means of a coupler installed in a recess formed in the end face, there is an effect that unit PC tubes having different diameters can be joined very easily and surely.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a joined state of a cross-section change portion of a PC pipe installed as a wireless tower or the like.

FIG. 2 is a plan view of a unit PC tube.

FIG. 3 is a vertical cross-sectional view showing a joined state of unit PC tubes.

FIG. 4 is a vertical cross-sectional view showing a joined state of a joint PC pipe and a unit PC pipe.

FIG. 5 is a vertical cross-sectional view showing a joined state of a joint PC pipe and a unit PC pipe.

FIG. 6 is a side view of a PC tube installed as a wireless tower or the like.

FIG. 7 is a vertical cross-sectional view showing a structure of a base portion of a PC tube installed as a wireless tower or the like.

FIG. 8 is a side view showing the entire length of a PC tube.

[Explanation of symbols]

a: lower large diameter part, b: upper small diameter part, 1, 2 unit PC
Pipes, 3 ... Joint pipes, 4 ... Recesses, 5a, 5b ... Recesses, 6, 7
… PC steel rod, 8… Coupler, 9… Joint PC steel rod,
10… Coupler, 11… Fixing nut, 12… Joint PC steel rod, 13… Coupler, 14… Foundation frame, 15… Level adjusting bolt, 16… Fixing PC steel rod, 17… Basic concrete.

Claims (5)

[Claims] 1. A PC pipe, wherein a plurality of unit PC pipes are installed while connecting a plurality of PC steel rods respectively inserted in the concrete of the unit PC pipes in the axial direction thereof. Molding method. 2. In a joint structure of unit PC pipes in which unit PC pipes having different diameters are joined in the material axis direction, one unit PC pipe is provided at one end between two unit PC pipes having different diameters to be joined. Has a joining end face of the same diameter as
A joint PC pipe having a joint end face having the same diameter as the pipe is installed, and a plurality of PC steel rods respectively inserted into the concrete of the joint PC pipe and the unit PC pipe are joined together. And unit PC pipe joint structure. 3. A plurality of PC steel rods are inserted into the concrete of the unit PC pipe and the joint PC pipe, respectively.
3. The unit PC pipe joint structure according to claim 2, wherein C steel rods are joined by a coupler installed in a recess formed in the joint end face of the joint PC pipe. 4. The unit PC tube is formed into a cylindrical shape, and
The method for molding a PC pipe according to claim 1, wherein a plurality of holes through which the PC steel rod is inserted are formed so as to penetrate therethrough in the material axis direction. 5. The unit PC tube is formed into a cylindrical shape, and
The joint structure of a unit PC pipe according to claim 2 or 3, wherein a plurality of holes through which a PC steel rod is inserted are formed so as to penetrate therethrough in the material axis direction.