JP4044684B2 - Construction method of prestressed concrete single-layer latticed dome - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a technical field of a construction method in which a single-layer lattice dome is assembled by applying a prestressed concrete (hereinafter sometimes abbreviated as “PC”) crimping method.
[0002]
[Prior art]
Conventionally, a dome other than a shell dome or a membrane structure dome is usually constructed by a steel truss member or a steel lattice member as shown in FIGS.
[0003]
In addition, the construction method of the shell structure described in Japanese Patent Application Laid-Open No. 61-1749 is a construction method of building a shell structure by stacking pieces of precast concrete (hereinafter sometimes abbreviated as PCa). The PC steel piece is protruded from the notch provided on the side of the PCa piece, and the adjacent PCa pieces are tensioned with each other and introduced with prestress to be fixed.
[Problems to be solved by the present invention]
When the dome is constructed of a steel truss member or a steel lattice member, a very high accuracy is required for manufacturing the joint b of each member a as shown in FIG. Not only building construction, but also very high accuracy is required. Moreover, since the joining angles of the members such as the steel truss member and the steel lattice member are various and varied, the cost of the joining portion is increased and the joining work is troublesome.
[0004]
The construction method for stacking PCa pieces described in the above publication has attention to the technology of fixing and fixing PC steel by prestressing, but it is a technology that is clearly different from the assembly method of lattice dome after all. .
[0005]
An object of the present invention is to provide an assembly structure method for a single-layer lattice dome in which a PCa member and a PCa joint portion are joined and assembled using a PC crimping method.
[0006]
A further object of the present invention is to provide an assembly construction method for a single-layer latticed dome in which a plurality of PCa members having an arbitrary joining angle are joined and assembled by a PC crimping joining method via a joining portion (joint block) made of PCa. That is.
[0007]
[Means for Solving the Problems]
As a means for solving the above-mentioned problem, an assembling method of the single-layer latticed dome made of prestressed concrete according to the invention of claim 1 is:
Odd precast concrete member 1 in the assembled construction method of a single-layer latticed dome you build bonded via a precast concrete joints 2 located on the node (joint block),
Be previously embedded sheath 4 penetrating in the longitudinal direction of the member 1 to the fixing portion 3 with a bit on the end of the precast concrete parts 1 provided fixing portion 3 of the large diameter,
The joints 2 (joint blocks) at the node positions where the odd-numbered precast concrete members 1 are gathered in an asymmetric radial shape are formed as odd-numbered polygons having the same number of sides 2a as the number of the precast-concrete members 1. Inside, the same number of PC steel rods 7 are arranged so as to be aligned with the respective sheaths 4 embedded in the fixing portion 3 of the precast concrete member 1 so as to protrude long from the joining surface 2a of the side where the precast concrete member 1 is joined. Buried ,
The precast concrete member 1 joined to the joint surface 2a of each side of the joint 2 (joint block) located at the node is joined to the sheath 4 embedded in the fixing portion 3 to the joint surface 2a of the joint 2 (joint block). It is characterized in that the PC steel rod 7 that protrudes long from is passed, post tension is introduced into the PC steel rod 7, crimped and joined, and assembled.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
3 and 4, as a reference example conceptually shows the assembled configuration method configured prestressed concrete single layer latticed dome skeletal an even precast concrete member. That is, the PCa members 1... Forming the skeleton of the single-layer lattice dome are joined to each other via a precast concrete joint 2 (joint block, sometimes referred to as a PCa joint) located at a node . A single-layer latticed dome made of prestressed concrete is assembled by carrying out the crimping method.
[0012]
More specifically, as shown in FIGS. 5A and 5B, a fixing portion 3 having a slightly larger diameter is provided at the end portion of the precast concrete member 1, and a sheath 4 penetrating the fixing portion 3 in the longitudinal direction of the member. Are buried in advance.
[0013]
On the other hand, when the precast concrete joint 1 is an even number of precast concrete members 1, for example, when six PCa members 1... Are gathered radially with symmetry as shown in FIG. , Having at least the same number of sides as the precast concrete member 1, for example, formed in a regular hexagon, and penetrates the same number of sheaths 5... Buried in state.
[0014]
Then, the fixing portion 3 of the precast concrete member 1 is brought into contact with each side of the joint portion 2, the PC steel rod 6 is passed through both the sheaths 4 and 5, and post tension is introduced into the PC steel rod 6. Then fix and bond. That is, each precast concrete member 1 is assembled as shown in FIG. 4 and FIG.
[0015]
Wherein instead of the PC steel bars 6, Ru possible der be assembled by joining crimped introduced post-tensioned through PC steel wire or strand.
[0016]
Further, in the above assembly method, mortar is injected into the gap between the contact surfaces of each precast concrete member 1 and the precast concrete joint 2 to fill the gap and absorb the manufacturing error of the joint 2 . relaxed accuracy requirements, Ru FIG improved construction accuracy.
[0017]
Next, as an embodiment of the invention described in claim 1, when odd-numbered precast concrete members 1 are gathered into the joints 2 (joint blocks) at the node positions radially and asymmetrically, for example, as shown in FIG. As illustrated in FIGS. 8A and 8B, the joining portion 2 in the case of joining the precast concrete members 1 has at least the same number of sides as the precast concrete members 1 perpendicular to the joining angles of the respective precast concrete members 1. The joint surface 2a is formed as an odd number of polygons, and the interior thereof is long from the joint surface 2a in an arrangement that coincides with the sheath 4 (see FIG. 5) of the fixing portion 3 of each precast concrete member 1 described above. The same number of protruding PC steel bars 7 are embedded together with the fixing bracket 8.
[0018]
And, with respect to the PC steel rod 7 on each side of the joint portion 2 (joint block) , the fixing portion 3 of each precast concrete member 1 to be joined is caused to relatively lean, and the PC steel rod 7 is passed through the sheath 4, Ru Nodea assemble established joined by introducing a post-tensioned in the same PC steel rod 7.
[0019]
[Effects of the present invention]
According to the assembly method of the prestressed concrete single-layer latticed dome according to the present invention, both the precast concrete member 1 and the joint 2 (joint block) are made of precast concrete, and the dry construction method can shorten the construction period. The joint 2 made of precast concrete can be manufactured in a wide variety of forms and structures at a relatively low cost. In addition, the mortar can be used to reduce the manufacturing accuracy of the precast concrete member 1 and the joint 2 and improve the construction accuracy. I can plan. In addition, since positioning and assembly can be performed regardless of manufacturing errors, construction accuracy is improved. And since it is the crimping | compression-bonding using the junction part 2 made from precast concrete, the joining of the several precast concrete member 1 which has the arbitrary joining angle which comprises a single layer lattice dome is possible easily.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a single-layer lattice dome.
FIG. 2 is an enlarged view of a portion A in FIG.
3 is a view to conceptual view as before bonding a reference example of the assembly construction method of a single-layer latticed dome constituted skeletal an even precast concrete.
4 is a view to conceptual diagram as after bonding a reference example of the assembly construction method of a single-layer latticed dome constructed by even precast concrete member.
[5] A, B is a plan view and a front view of an precast concrete member.
6A and 6B are a plan view and a front view showing a reference example of the joint shown in FIGS. 3 and 4. FIG.
FIG. 7 is a front view showing a reference example of an assembling method of a single-layer lattice dome constructed by an even number of precast concrete members .
[8] A, B is a plan view and a front view of an implementation form of the joint for use in the assembly construction method of a single-layer latticed dome of the present invention.
FIG. 9 is a front view showing an embodiment of a method for assembling a single-layer lattice dome according to the present invention.
[Explanation of symbols]
1 Precast concrete 2 Joint (joint block)
3 Fixing Section 4 Sheath 5 Sheath 6 PC Steel Bar 7 PC Steel Bar 8 Fixing Bracket

Claims (1)

Odd precast concrete parts, the precast concrete joint portion located at a node in the assembly construction method of a single-layer latticed dome you build bonded via the (joint block),
A fixing portion having a slightly larger diameter is provided at the end of the precast concrete member and a sheath penetrating in the longitudinal direction of the member is embedded in the fixing portion in advance.
The joints (joint blocks) at the node positions where the odd-numbered precast concrete members are gathered in an asymmetric radial shape are formed as odd-numbered polygons having the same number of sides as the number of the precast concrete members, The same number of PC steel bars in an arrangement corresponding to each sheath embedded in the fixing portion of the precast concrete member is embedded in a configuration that protrudes long from the joining surface of the side where the precast concrete member is joined ,
The precast concrete member to be joined to the joint surface of each side of the joint (joint block) located at the node is a PC steel rod that protrudes long from the joint surface of the joint (joint block) to the sheath embedded in the fixing part It was passed through, and wherein the assembled by joining crimped by introducing post tension to the PC steel bars, the assembly construction method of the prestressed concrete single layer latticed dome.

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