JPH0547829Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is a system in which a large number of precast concrete members (hereinafter referred to as Pca members) are arranged side by side to cross under railroad tracks or roads. Laterally tighten each Pca member in the sub-base crossing structure or other underground structure to be constructed.
This relates to the anti-corrosion structure of PC steel materials.

[Conventional technology]

Conventionally, as an underground structure that crosses under a roadbed such as a railway track, an underground structure disclosed in Japanese Patent Application Laid-Open No. 61-95199 has been known. In other words, in the case of this underground structure, Figure 13 and Figure 1
As shown in Figure 4, the ceiling of the underground structure consists of a large number of Pca members extending in the longitudinal direction and an upper steel box girder 7 placed adjacent to the sides of the Pca members 1 at both left and right ends.
The left and right side walls are composed of a large number of Pca members 8 located below the upper steel box girder 7 and a lower steel box girder 9 located at the lowest stage.

At the top and bottom of the cross-section of each Pca member 1 in the ceiling, there are horizontal tightening holes 3 for penetrating the horizontal tightening PC steel material 28 necessary for integrating each Pca member 1 together.
are provided at intervals in the longitudinal direction of the Pca members, and also on the inner wall side and the outer wall side of the cross section of each Pca member 8 on the side wall portion. Horizontal tightening holes 11 for penetrating the Pca member are provided at intervals in the longitudinal direction of the Pca member.

After the horizontal tightening PC steel materials 28 and 29 made of unbonded PC steel strands are inserted into the ceiling and side walls, mortar 12 is filled in the joint gaps between the Pca members and between the Pca members and the steel box girder. At the same time, the mortar 12 also infiltrates between the horizontal tightening hole and the PC steel material, and after the mortar 12 reaches a predetermined strength, an anchor plate 13 and an anchor plate are installed at the ends of the horizontal tightening PC steel materials 28 and 29. The fixture 14 is set, first the horizontal tightening PC steel material 28 on the ceiling is tensioned and fixed, then the horizontal tightening PC on the left and right side walls is tightened and fixed.
The steel material 29 is tensioned and fixed.

In the case of an underground structure having Pca members that are laterally tightened as described above, the mortar 12 filled in the joint gaps also infiltrates between the side tightening holes and the PC steel material, but mortar has poor fluidity and side tightening hole and
Since the gap between the prestressing steel and the prestressing steel is narrow and long, it is not possible to fill the entire gap with mortar. Therefore, the rust prevention of horizontally tightened PC steel materials is incomplete.

As a countermeasure for this, many PCAs placed in parallel
After inserting a continuous steel sheath across the horizontal tightening hole in the member, insert a prestressing steel material into the steel sheath, and then apply a hardenable liquid such as cement milk between the steel sheath and the prestressing steel material. It is possible to inject and fill the grouting material.

[The problem that the idea attempts to solve]

However, because the conventional steel sheath has high rigidity, it cannot be bent to a small radius, and there is no large underground space on the side of the Pca members arranged in parallel, so it cannot be bent continuously across each Pca member. It is not possible to insert the steel sheath.

This idea allows a sheath to be easily inserted across the side tightening holes of each PCA member in an underground structure having a large number of PCA members arranged in parallel, and prevents the side tightening PC steel material inserted into the sheath from rusting. The purpose of this study is to provide a rust-proof structure for horizontally tightened PC steel materials in underground structures.

[Means to solve the problem]

In order to achieve the above object, in the anti-corrosion structure of horizontally tightened PC steel materials in underground structures of this invention, a bellows-shaped flexible sheath 4 having a large number of annular irregularities is provided with an outer periphery of the flexible sheath 4. A plurality of rubber seal cylinders 16 in contact with the outer surface are fitted at intervals in the longitudinal direction of the flexible sheath, and the seal cylinders 16 are fitted at intervals in the longitudinal direction of the flexible sheath.
is airtightly fixed to the flexible sheath 4, and a rubber seal cylinder 16 is attached to the flexible sheath 4.
Each precast concrete member 1 in an underground structure 2 having a large number of precast concrete members 1 arranged in parallel is provided with a ventilation hole 24 and a bellows-shaped flexible sheath 15 with a seal tube. across horizontal tightening hole 3,
The bellows-shaped flexible sheath 15 with a seal tube is inserted through the bellows-shaped flexible sheath 15 with a seal tube.
Due to the air pressure inside the rubber seal tube 16 at
The rubber seal cylinder 16 is brought into close contact with the hole wall of the horizontal tightening hole 3, a curable filler 27 is filled between the adjacent seal cylinders 16, and the bellows-like flexible sheath 4 and the horizontal A liquid grout material 6 is injected and filled between the prestressed PC steel material 5 and the prestressed PC steel material 5.

[Effect]

A large number of Pca members 1 having horizontal tightening holes 3 are arranged in parallel, and a bellows-shaped flexible sheath 15 with a seal tube is inserted across the horizontal tightening holes 3 of each Pca member 1, and then inserted into the sheath tube 16. Air is supplied to bring the sheath tubes 16 into close contact with the horizontal tightening holes 3, and a curable filler 27 is filled between adjacent sheath tubes 16, thereby forming a bellows-like flexible sheath 15 with a seal tube. Laterally tightened PC steel material 5 is inserted into the flexible sheath 4, and then laterally tightened with the bellows-shaped flexible sheath 4.
A liquid grout material 6 is injected and filled between the prestressing steel material 5 and the prestressing steel material 5 .

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

9 to 12 show a bellows-like flexible sheath 15 with a seal tube used in an embodiment of this invention, in which a bellows-like flexible sheath 4 made of hard polyethylene has many annular irregularities. A large number of rubber seal tubes 16 are fitted onto the outer periphery of the flexible sheath 4 at intervals in the longitudinal direction of the flexible sheath 4. A rubber balloon 18 is airtightly fixed to the sheath 4 with an adhesive or airtightly tied and fixed with a metal wire 17, and the outer periphery of one end of the flexible sheath 4 has a reduced diameter on the tip side.
The proximal opening of the flexible sheath 4 is fitted and fixed airtightly with an adhesive or airtightly fixed with a metal wire 19, and the other end of the flexible sheath 4 has an air supply hole 20. A cap 21 having a cap 21 is fitted and hermetically fixed with an adhesive or a metal wire 22.

The flexible sheath 4 is provided with a ventilation hole 24 inside the sheath tube 16, and one end of the air supply rubber hose 23 is fitted into the cap 21 and fixed with adhesive.
The other end of 3 is connected to a compressed air supply source such as a compressor via an on-off valve (not shown).

Next, the bellows-shaped flexible sheath 15 with the seal tube
This section explains the construction sequence when performing the horizontal tightening of an underground structure using a large number of PCA members using PCA members, and the rust prevention of horizontally tightened PC steel materials.

First, as shown in FIGS. 1 and 2, a large number of Pca members 1 are provided with horizontal tightening holes 3 at the upper and lower parts of the cross section, and an upper part disposed adjacent to the side surfaces of the Pca members 1 at both left and right ends. The ceiling section consisting of the steel box girder 7 is constructed in the same manner as in the conventional case, and is located below the upper steel box girder 7 and the horizontal tightening hole 11.
The side wall section is constructed in the same manner as in the conventional case, consisting of a large number of Pca members 8 and a lower steel box girder 9 located at the lowest stage.

A large diameter part 25 for guiding sheath insertion is provided at the end of the side tightening hole 3, 11 of each Pca member 1, 8 on the sheath insertion start side, and the Pca member 1, 8 and the upper steel box girder 7 are connected to the ground. When press-fitting inside, a closing plate 26 for closing the gap between the Pca members is fixed to the inside and outside of one of the adjacent Pca members or the upper steel box girder 7.

Next, as shown in FIG. 3, the bellows-shaped flexible sheath 15 with a seal tube is inserted into the through hole provided in the side plate of the upper steel box girder 7 on the Pca member side, and the upper steel box on both left and right sides. Insert across the horizontal tightening hole 3 of each Pca member 1 between the girders 7, and each Pca member 1
A rubber seal cylinder 16 is arranged in the longitudinal center of the horizontal tightening hole 3 in the lateral tightening hole 3 , and then compressed air is supplied from the rubber hose 23 through the flexible sheath 4 into each rubber seal cylinder 16 to increase the air pressure. By this, each rubber seal cylinder 16 is expanded and pressed into the horizontal tightening hole 3 of each Pca member 1.

Next, as shown in FIGS. 4 and 5, adjacent
A hardening filler 27 made of mortar is applied to one section of the joint gap between the Pca members 1 and the gap between the horizontal tightening hole 3 and the flexible sheath 4 that communicate with the joint gap from the longitudinal end of the joint gap. In addition, the hardening filler 27 is injected and filled into the gaps between the joint gaps of other sections and the horizontal tightening holes 3 and flexible sheaths 4 that communicate with these, one section at a time, and then the upper steel The curable filler 27 is also injected and filled into the joint gap between the box girder 7 and the Pca member 1 at the end, and the gap between the horizontal tightening hole 3 and the flexible sheath 4 communicating therewith.

After the curable filler 27 in each section has hardened, as shown in FIGS. 6 to 8, the air inside the rubber seal cylinder 16 is discharged to contract the rubber seal cylinder 16, and After cutting the end of the flexible sheath 4 protruding into the upper steel box girder 7, the horizontally tightened PC steel material 5 made of twisted PC steel wires is inserted into the flexible sheath 4, and then the upper steel box girder 7 is inserted into the flexible sheath 4. In the box girder 7, the anchor plate 13 is fitted to the horizontally tightened PC steel material 5, the horizontally tightened PC steel material 5 is tensioned and fixed by the fixing device 14, and then the flexible sheath 4 and the horizontally tightened PC steel material are fixed. 5, a liquid grout material 6 made of cement milk is injected and filled from an injection hole 30 provided in the anchor plate 13 and hardened.

In addition, the horizontal tightening and horizontal tightening PC of each Pca member 8, upper steel box girder 7, and lower steel box girder 9 in the side wall part
Corrosion protection for the steel material 10 is performed in the same manner as for the ceiling.

If the large diameter part 25 for guiding sheath insertion is provided at the end of the side fastening holes 3 and 11 on the side where sheath insertion starts, as in the embodiment described above, it is possible to prevent errors in the production of the Pca member or the installation error of the Pca member. next to each other
Even if the horizontal tightening hole of the Pca member is slightly eccentric, the flexible bellows sheath 4 can be inserted into each It can be inserted through the horizontal tightening hole without any problem.

When implementing this invention, the fixing device 14 may be of any known structure.
Further, as the bellows-shaped flexible sheath 4, one having a large number of independent annular irregularities may be used, or one having spiral irregularities may be used.

The rubber seal cylinder 16 may have a cylindrical intermediate portion. Further, a closure cap may be attached to the distal end of the flexible sheath 4 without attaching the rubber balloon 18.

[Effect of idea]

This idea is structured as described above, so
This produces the effects described below.

A large number of structures arranged in parallel in underground structure 2
Since the flexible sheath 4 in the bellows-shaped flexible sheath 15 with rubber seal tube inserted across the horizontal tightening hole 3 of the Pca member 1 is bellows-shaped, the bellows-shaped flexible sheath 4 can be easily used in a narrow underground space. The flexible sheath 4 can be inserted continuously across the horizontal fastening holes 3 of a large number of Pca members 1 arranged in parallel without any trouble, and since the bellows-shaped flexible sheath 4 is easily deformed, Even if the horizontal tightening hole 3 of the matching Pca member 1 is slightly eccentric, it can be easily inserted through the horizontal tightening hole 3, and the continuous flexible sheath 4 and the horizontal tightening PC steel material 5 inserted therein can be easily inserted. Since the liquid grout material 6 is injected and hardened between the flexible sheath 4 and the flexible sheath 4, the entire horizontally tightened PC steel material 5 inside the flexible sheath 4 can be reliably rust-proofed. By this, the horizontally tightened PC steel material 5 can be protected.

Furthermore, since the irregularities of the hardened grout material 6 fit into the irregularities of the bellows-shaped flexible sheath 4, the flexible sheath 4 and the grout material 6 can be integrated and strengthened. Since the elastic sheath 4 can be wound to a small radius, the bellows-like flexible sheath 4 can be easily carried into narrow spaces.
Furthermore, since the plurality of rubber seal tubes 16 are attached to the bellows-like flexible sheath 4, the curable filler 27 can be strongly and reliably filled between adjacent rubber seal tubes 16. .

[Brief explanation of the drawing]

Figures 1 to 12 show one embodiment of this invention, in which Figure 1 is a longitudinal sectional front view showing the state in which the members constituting the sub-base course crossing structure are press-fitted into the ground, and Figure 2 The figure is a vertical sectional front view showing an enlarged part of Figure 1, and Figure 3 is a set of bellows-shaped flexible sheaths with seal tubes inserted across a number of Pca members in the ceiling and the upper steel box girder. 4 is a vertical sectional front view showing a state in which the hardening filler is filled between the joint gap and the bellows-shaped flexible sheath and the horizontal tightening hole, and FIG. Fig. 6 is a vertical sectional front view showing a part of the underground structure after completing anti-corrosion treatment of horizontally tightened PC steel materials, and Fig. 7 is the vicinity of the anchor plate in Fig. 6. Figure 8 is an enlarged longitudinal sectional front view of
FIG. 3 is an enlarged longitudinal sectional front view showing the vicinity of the rubber seal cylinder in the figure. 9 to 12 show a bellows-shaped flexible sheath with a seal tube used in an embodiment of this invention, in which FIG. 9 is a partially cutaway vertical side view, and FIG. 10 is a distal end portion. FIG. 11 is an enlarged longitudinal sectional side view showing the intermediate portion, and FIG. 12 is an enlarged longitudinal sectional side view showing the proximal end portion. FIG. 13 is a longitudinal sectional front view showing a conventional under-roadbed crossing structure, and FIG. 14 is an enlarged longitudinal sectional front view showing a part of FIG. 13. In the figure, 1 is a precast concrete member, 2 is an underground structure, 3 is a horizontal tightening hole, 4 is a bellows-like flexible sheath, 5 is a horizontal tightening PC steel material, 6 is a grout material, and 7 is an upper steel box girder. , 8 is a Pca member, 9 is a lower steel box girder, 10 is a side tightening PC steel material, 11 is a side tightening hole, 13 is an anchor plate, 14 is a fixing device,
15 is a bellows-shaped flexible sheath with a seal tube, 16 is a rubber seal tube, 18 is a rubber balloon, 21 is a cap, 23 is a rubber hose for air supply, 25 is a large diameter part for guiding sheath insertion, 26 is a closing plate, 27 is a curable filler, and 30 is an injection hole.

Claims (1)

[Scope of utility model registration request] Bellows-shaped flexible sheath 4 having many annular irregularities
A plurality of rubber seal tubes 16 that are in contact with the outer surface of the flexible sheath 4 are fitted onto the outer periphery of the flexible sheath 4 at intervals in the longitudinal direction of the flexible sheath. A rubber seal cylinder 16 is fixed to the sheath 4 in an airtight manner and is attached to the flexible sheath 4.
Each precast concrete member 1 in an underground structure 2 having a large number of precast concrete members 1 arranged in parallel is provided with a ventilation hole 24 and a bellows-shaped flexible sheath 15 with a seal tube. across horizontal tightening hole 3,
The bellows-shaped flexible sheath 15 with a seal tube is inserted through the bellows-shaped flexible sheath 15 with a seal tube.
Due to the air pressure inside the rubber seal tube 16 at
The rubber seal cylinder 16 is brought into close contact with the hole wall of the horizontal tightening hole 3, a curable filler 27 is filled between the adjacent seal cylinders 16, and the bellows-like flexible sheath 4 and the horizontal A rust-proof structure of horizontally tightened PC steel materials in an underground structure in which liquid grout material 6 is injected and filled between the tightened PC steel materials 5.