JPS58143062A - Partial fixation of unbond pc steel material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves placing concrete in a state in which unbonded PC steel materials are buried over multiple spans, and after hardening, tensioning the unbonded materials using solid concrete as a reaction force. In a method for constructing a concrete structure that introduces prestress into monolithic concrete, a method for fixing the middle t1 & 1 portions of the PC steel in the unbonded PC rope to the monolithic concrete is provided.

Generally, as a prestress introduction agent PC steel material using the post-tensioning method, a lubricant such as grease is applied to a part of the PC copper material of the PCwII4 horizontal wire or PC rope cape, and the surrounding area is covered with a synthetic grip such as polyethylene. In the case of using so-called unbonded PC steel coated with a bream sleeve, the anchoring of the PC steel to the monolithic concrete is carried out only at both ends.

Therefore, like the continuous beam shown in Fig. 1, in a concrete structure 1 in which a long unbonded PC steel material A is buried in multiple spans, the ore and the intermediate part of the PC steel material are integrated with a lubricant and a covering sleeve. Concours) Is it a place where he is cut off from C and can move freely?6. There is a possibility that the concentrated load W acts on some spans and the elongation of the rope concentrates on the large and narrow parts, and as a result, there is a possibility that the effect of introducing prestress in these parts will not be produced.

It seems that this problem can be solved by adding unbonded PC steel to concrete for each appropriate span, but,
The company is so lenient that no measures have been taken.

In consideration of the above-mentioned actual situation, the present invention is capable of fixing parts of the unbonded PC steel material to the tough body contacts, and when a concentrated load is applied, the amount of elongation of the PC steel material is concentrated at that part. This paper proposes a method for partially fixing unbonded PC steel materials that can prevent loss of the stress effect.

Embodiments of the present invention will be described below based on drawings.

No.j! - is made of PC steel materials such as PC stranded wire and PC #i rods, a lubricant such as grease applied to the eyelets, and a covering sleeve made of a synthetic resin material such as polyethylene thicken that corrugates these materials. Long unbonded PC configured
Multiple spans of w4 material A are integrated into a single concrete IJ-)
A concrete structure B, such as an unbonded beam, is shown buried in C and with concrete C as a reaction force.

The unbonded PC steel material A#c is provided with stoppers D... fixed to the PC steel material at various places in the middle threshold, such as for each span or for each multiple spans. is partially fixed to the noodle concrete C via stoppers D...

III Nutotsuba DFi, as shown in Figures 8, 4, and 5, II@s1, bearing plates 2 provided at both ends thereof, injection pipe ink, and injection foreshadowing rod. It has a vibrator 4, and the short W61 has two diametrical diameters, and can be connected to each other by welding. This connection is not limited to bath shaking; for example, it can be done using bolts and nuts 5 as shown in Figure 11! Of course, any means can be used for this purpose. Figure 7, Figure 7, (b) Medium, 7 is a seal installed to prevent concrete slag from entering.

Next, a method of fixing the PC material and the stopper D in the unbonded PC steel material will be explained.

First, at an arbitrary position in the middle of the unbonded PC steel material A, as shown in FIG. expose.

Next, as shown in Figure 6 (b), the exposed PC steel material 1
At the same time, fit a stopper in the hole, and insert a hoop 11 around the S of the unpond PC'g4 material A on both sides.
・(trans)b. In this case, if the inner diameter of the PC steel insertion hole formed in the bearing pressure plate 2... is equal to or slightly smaller than the outer diameter of the covering sleeve 8, the bearing pressure plate 2... It is also possible to hold the covering sleeve 8 and use the covering sleeve 18 as a packing, but in this example, an elastic string 12 such as a rubber belt is wrapped around a part of the sleeve 8, and the covering sleeve 18 is used from the outside. It is held in place by bearing plates 2... to prevent concrete slag from entering.

The above work may be performed after reinforcing the unbonded PCW4 material A at a predetermined position within the formwork, or may be performed in advance prior to reinforcing.

After that, as shown in Figure 6 (c), a single conch!
J-) Cast C. The ends of the injection pipe and the Ng pipe 4 are made to protrude from the surface of the concrete C.

After the concrete C has hardened and has been demolded, one end of the PC rope 10 in the unbonded PC rope A is fixed to the concrete C, and the other end of the PC rope 10 is fixed with the concrete C as a reaction force. Pull it with Jyatsuki etc! [>, and is fixed on the concrete C, and a predetermined prestress is introduced into the concrete sheet C.

After that, as shown in No. 11HK, from the injection pipe ink to the inside of the cylindrical part 1 of the stopper p, cement milk,
111, - Inject Sosei Resin Misaki's caking material S until it blows out from pipe 4, and then install stopper D and S inside 70.
PCg material 1 material color 0 located at '?'? No. h, and pipe 4 for injection vibro and 1iii is Hunter 4.
0 If there are places that stand out and get in the way, cut them off.

According to the above configuration, even if a concentrated 11 weight acts on -4 of the interconnection F structure 1, the stopper D located in the middle of the unbonded PC steel material A is integrated with the PC steel material 10, and the PC wire Since the movement of the material 10 with respect to the component concrete sheet C is prevented, and the free movement of the prestressing steel material 10 over the entire length is prevented, the amount of elongation of the prestressing steel material 10' can be prevented from being concentrated at nine locations due to the effect of concentrated electrical charge. Therefore, it is possible to prevent the prestress in this part from being released. The hoop 11 serves to disperse the stress of the concrete C8 in the vicinity of the bearing plate 2, thereby preventing the concrete C portion from being crushed.

Before, PC steel material 10 carried out after concrete C hardening
Taking into consideration the elongation of the PCY4 material 10 due to the application of tension to the PC4 steel material 10, lubricant 9Q was applied so that the exposed part of the PC steel material 10 coincides with the cylindrical portion 1 at the stretch where the elongation occurred. Covering sleeve 8
And lubricants! By appropriately setting the position and length of removal, a part of the cylinder s1 in the stopper D can be made as short as possible. In this case, as shown in FIG. 8, the stopper D is removed. Also, the exposed pcH
When iron or steel tape is wound spirally around material 1o and fixed with metal adhesive, the injected solidifying material S
By increasing the adhesion force with the solidifying material S by providing unevenness on the outer teeth of the PC steel material 10 and the inner surface of the stopper D, the length of the stopper 〇 can be increased. -It is possible to write ink.

9, stopper, mine! If it's a jōbushi, it's the foot shi, the first *m example, and it's not limited to the nine kabushi, the 9th button, the -1
(f) Various shapes can be adopted, such as a female wall, a rectangular cylindrical shape, etc., as shown in the figure.

Especially in the case of shapes as shown in ssm&Ls, (to)K,
It is convenient to apply to the intersection of unbonded PC rope material A**.

As described above based on each embodiment, according to the present invention, the covering stoop and the lubricant in the middle of the unbonded PC rope are discussed, and the injection pipe and the injection pipe for checking the injection hint are The stopper with its bearing surface against the concrete is fitted and in good condition, and prestressing is performed to seal the concrete and reeet after concrete pouring and hardening, and after that, a consolidating material is placed inside the front stopper. Since the stopper and the PC steel material located in the circular part are integrated by injection, the middle part of the PCkIi4 material is identified to the knitted concrete through the stopper, preventing free movement of the PC steel material over the entire length. be able to.

Therefore, when a concentrated load is applied to a part of the concrete structure, stretch marks of the PC steel can be prevented from being concentrated in this part, and the effect of introducing prestress can be reliably exerted.

In particular, when a two-sided stopper that can be connected to each other is used as a stopper, it is easy to fit the stopper onto the PC steel material, and good workability can be obtained.

[Brief explanation of the drawing]

Figure 1- is a schematic diagram for explaining the problems in the conventional structure, Figures 2 and 3 show examples of the present invention, Figure 2 is a concrete structure, and Figure 8 is an exploded perspective view. Figure 4 is a partly cutaway 111IITO diagram, 'Mb diagram is a local new song diagram, Figure 6 (A), (B), e →, ni) t (2) explains the procedure of Sadakata ITO Cross-sectional view, No. 7M). (middle) is a cross-sectional view of the cylindrical portion showing another example, Fig. 8 is a cross-sectional view showing another embodiment, and Fig. 9), (b). f→g! each indicates a different embodiment. FIG. A... Unbonded PC#I4 material, B... Concrete structure, C... Integral concrete, 2.
... Support plate, 6... Injection pipe, 4...
Confirmation pipe, 8... Covering sleeve, 9...
・Lubricant, 10...pc steel material. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 6 Figure 7

Claims (1)

[Claims] ■ Unbonded PC copper material spans multiple spans! U
A single piece of concrete is poured in a general condition, and after hardening,
In a method for constructing a concrete structure in which prestress is introduced into the integral concrete by tensioning the PC steel in the unbonded PC steel with the reaction force of the concrete, the middle part I of the unbonded PC steel
lc strange wrinkles I! The X9-pipe and lubricant were removed to expose a part of the PC sea bream material, and on this exposed PC refill, we added a corporate pipe and a Jl. In the law department wearing nine stoppers,
Prestress is introduced to the concrete (after the concrete is cast and hardened), and then the s#cm binder inside the stopper is injected to integrate the @limb stopper and the pcwI4 material located inside the 7Φ. A method for partially fixing unbonded PC rope material. ■ The stopper is of a two-sided structure that can be connected to each other.
A method for partially fixing unbonded PC rope according to item 0.