JPH0694792B2 - Method for pouring and filling grout between precast concrete members in underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is constructed so that a large number of precast concrete members (hereinafter referred to as Pca members) are arranged side by side so as to traverse under a railroad track or under a road. The present invention relates to a method for injecting and filling a curable grout material into a joint gap between adjacent Pca members in a sub-base structure or other underground structure.

[Conventional technology]

BACKGROUND ART Conventionally, as an underground structure that traverses under a roadbed such as a railroad track, an underground structure disclosed in JP-A-61-95199 is known. That is, in the case of this underground structure, as shown in FIG. 13 and FIG. 14, the ceiling portion of the underground structure is adjacent to a large number of Pca members 5 extending in the front-rear direction and the side faces of the Pca members 5 at the left and right ends. And the upper and lower steel box girders 9 arranged side by side, and the left and right side walls are a large number of Pca members 10 located below the upper steel box girder 9 and the lower steel box girder 11 located at the bottom. It is composed of and.

At the top and bottom of the cross section of each Pca member 5 on the ceiling,
Lateral fastening required to integrate the members 5 with each other, lateral fastening holes for penetrating the PC steel material 12 are provided at intervals in the longitudinal direction of the Pca member, and the inner wall side of the cross section of each Pca member 10 of the side wall portion. And also on the outer wall side, horizontal tightening holes 14 for penetrating the PC steel material 13 necessary for integrating each Pca member 10 with each other.
Are provided at intervals in the longitudinal direction of the Pca member.

After the laterally tightened PC steel materials 12 and 13 made of unbonded PC steel twisted wires are inserted into the ceiling portion and the side wall portion, hardening made of mortar is made in the joint gap between the Pca members and between the Pca member and the steel box girder. When the grout material 8 is injected and filled, the grout material 8 also enters between the lateral fastening holes and the lateral fastening PC steel material, and after the grout material 8 reaches a predetermined strength, the lateral fastening PC steel material 12 Anchor plate 15 and fixing tool 16 are set at the ends of 13 and 13, first the horizontal tightening PC steel material 12 on the ceiling is tightened and fixed, then the horizontal tightening PC steel material 13 on the left and right side walls is tightened and fixed. To be done.

[Problems to be Solved by the Invention]

However, when constructing the above-mentioned conventional underground structure, the curable grout material 8 is provided in the joint gap between the adjacent Pca members.
In the case of pouring and filling, the joint gaps communicate with each other through the lateral fastening holes, so when the grout material 8 is injected into one joint gap, the grout material passes through the lateral fastening holes and the adjacent joint gaps are inserted. It is difficult to completely inject and fill the grout material into the joint space because the injection pressure in the joint space to be injected decreases.

An object of the present invention is to provide a method for injecting and filling grout material between Pca members in an underground structure capable of completely injecting grout material into a joint gap.

[Means for solving problems]

In order to achieve the above object, in the grout material injection filling method between the Pca members in the underground structure of the present invention,
A large number of rubber seal cylinders 2 are fitted outside the sheath 1 whose both ends are closed at intervals in the sheath longitudinal direction, and both ends of each rubber seal cylinder 2 are airtightly fixed to the sheath 1. The sheath 1 is provided with a ventilation hole 3 inside each rubber seal tube 2 to form a sheath 4 with a seal tube, and the sheath 4 with a seal tube is provided with a large number of precast concrete members 5 arranged in parallel. The rubber seal cylinder 2 is inserted through the lateral fastening holes 7 of each precast concrete member 5 in the underground structure 6 that it has, and inside the lateral fastening holes 7 of each precast concrete member 5.
After arranging, the compressed air is supplied from the end portion of the sheath 1 into the rubber seal cylinder 2 through the inside of the sheath and the ventilation hole 3, and the rubber seal cylinder 2 is expanded by air pressure to horizontally tighten the side seal. The holes 7 are pressed into contact with each other, and then the joint gaps between the adjacent precast concrete members are sequentially filled with the curable grout material 8 one by one.

[Action]

A sheath 4 with a seal tube including a large number of rubber seal tubes 2 is inserted through the lateral fastening holes 7 of each Pca member 5 in an underground structure 6 having a large number of Pca members 5 arranged in parallel, After arranging the rubber seal cylinder 2 in the lateral tightening hole 7 of the Pca member 5, the inside of the sheath 1 and the sheath 1 are arranged.
Compressed air is supplied into the rubber seal tube 2 through the ventilation hole 3 and the rubber seal tube 2 is expanded by air pressure and brought into pressure contact with the lateral tightening hole 7, thereby connecting adjacent joint gaps. The gap between the lateral tightening hole 7 and the sheath 1 is blocked, and then the curable grout material 8 is sequentially placed one by one in the joint gap.
Inject and fill.

〔Example〕

 The present invention will now be described in detail with reference to the illustrated example.

9 to 12 show a sheath 4 with a sealing tube used in an embodiment of the present invention, in which the outer surface of the sheath 1 is formed on the outer circumference of the sheath 1 made of a rigid polyethylene bellows-like flexible sheath. A large number of rubber seal cylinders 2 that are in contact with each other are fitted at intervals in the lengthwise direction of the sheath, and both ends of the rubber seal cylinder 2 are airtightly fixed to the sheath 1 with an adhesive, or metal. The wire 17 is airtightly bound and fixed, and on the outer periphery of one end of the sheath 1,
The proximal end side opening of the rubber balloon 18 having a reduced diameter on the distal end side is fitted and airtightly fixed by an adhesive or airtightly fixed by a metal wire 19, and further the sheath 1
A cap 21 having an air supply hole 20 is fitted to the other end of the, and airtightly fixed by an adhesive, or a metal wire rod.
It is fixed airtight by 22.

The sheath 1 is provided with a vent hole 3 inside the seal tube 2, and the cap 21 is provided with an air supply rubber hose.
One end of 23 is fitted and fixed by an adhesive, and the other end of the rubber hose 23 is connected to a compressed air supply source such as a compressor via an on-off valve (not shown).

Next, the construction order when constructing an underground structure having a large number of Pca members using the sheath 4 with a sealing cylinder will be described.

First, as shown in FIG. 1 and FIG. 2, a large number of Pca members 5 having horizontal fastening holes 7 in the upper and lower portions of the cross section and the upper portions arranged adjacent to the side surfaces of the Pca members 5 at the left and right ends. The ceiling part consisting of the steel box girders 9 is constructed in the same manner as in the conventional case, and it is located under the upper steel box girders 9 and has a large number of Pca members 10 provided with horizontal tightening holes 14 and the maximum. The side wall composed of the lower steel box girder 11 located at the lower stage is constructed in the same manner as in the conventional case.

A large diameter portion 24 for guiding sheath insertion is provided at the end of the side tightening holes 7 and 14 of each Pca member 5 and 10 on the sheath insertion start side, and the Pca member 5 and 10 and the upper steel box girder 9 are grounded. When press-fitting into the inside, a closing plate 25 for closing the gap between the Pca members is fixed to the inside and the outside of one adjacent Pca member or the upper steel box girder 9.

Next, as shown in FIG. 3, the sheath 4 with the sealing tube is attached.
Is a through hole provided in the side plate on the Pca member side of the upper steel box girder 9 and each Pc between the left and right upper steel box girders 9.
a The rubber seal tube 2 is inserted through the lateral tightening hole 7 of the member 5 and in the longitudinal center portion of the lateral tightening hole 7 of each Pca member 5, and then compressed air is injected from the rubber hose 23 into the sheath 1. Through each of the rubber seal cylinders 2 to expand the rubber seal cylinders 2 by the air pressure to generate the respective Pca members 5.
It is pressed into the lateral tightening hole 7.

Next, as shown in FIGS. 4 and 5, 1 between the adjacent Pca members 5 partitioned by the adjacent rubber seal cylinders 2
The joint gap of the compartment and the gap between the lateral tightening hole 7 and the sheath 1 communicating with the joint are filled with a curable grout material 8 made of mortar by injection from the longitudinal end of the joint gap.
In addition, the curable grout material 8 is sequentially injected and filled into each of the joint gaps of the other compartments and the gaps between the lateral tightening holes 7 and the sheath 1 which communicate with the joint gaps, and the upper steel box girders 9 and the end portions are further filled. The curable grout material 8 is also injected and filled into the joint gap between the Pca members 5 and the gap between the lateral tightening hole 7 and the sheath 1 communicating with the joint gap.

After the curable grout material 8 in each section is hardened, the sixth
As shown in FIG. 8 to FIG. 8, the end of the sheath 1 that discharges air from the rubber seal tube 2 to contract the rubber seal tube 2 and projects into the upper steel box girder 9. After cutting, the horizontal tightening PC steel material made of PC steel stranded wire inside the sheath 1
26, then tighten horizontally in the upper steel box girder 9.
Anchor plate 15 is fitted to PC steel material 26 and horizontally tightened PC
The steel material 26 is tensioned and fixed by the fixing tool 16, and then a liquid grout material 27 made of cement milk is inserted between the sheath 1 and the laterally tightened PC steel material 26 from an injection hole 28 provided in the anchor plate 15. Inject and fill and cure.

In addition, even in the side wall part, as in the case of the ceiling part,
A hardening grout material 8 is injected and filled in the joint gap between each Pca member 10, the upper steel box girder 9, and the lower steel box girder 11, and lateral tightening is performed.
Lateral fastening with the PC steel material 29 and injection and filling of the grout material into the sheath material 1 are performed.

In the case of the above-mentioned embodiment, the laterally tightened PC steel materials 26 and 29 can be covered with the grout material 27 injected and filled between them and the sheath 1 to prevent rust. The fixing device 16 may have a known arbitrary structure.

In the case of carrying out the present invention, the rubber seal cylinder 2 having a cylindrical intermediate portion may be used. Further, the closing cap may be attached without attaching the rubber balloon 18 to the distal end portion of the sheath 1.

[Effects of the Invention] Since the present invention is configured as described above, it has the effects described below.

The sheath 4 with the seal tube is used for a large number of Pca's arranged in parallel.
After inserting through the lateral fastening holes 7 of each Pca member 5 in the underground structure 6 having the member 5 and disposing the rubber seal cylinder 2 in the lateral fastening holes 7 of each Pca member 5, the inside of the sheath 1 and the sheath Rubber seal tube 2 through vent hole 3 of 1
Compressed air is supplied to the inside of the rubber seal cylinder 2 by air pressure.
Is expanded and brought into pressure contact with the lateral tightening hole 7, so that the gap between the lateral tightening hole 7 and the sheath 1, which communicate the adjacent joint gaps in the underground structure 6, can be blocked by a simple means.

In addition, in a state in which the gap between the lateral tightening hole 7 and the sheath 1 that communicates the adjacent joint gap is blocked, each adjacent Pca
Since the curable grout material 8 is sequentially injected and filled into the joint gaps between the members 5 one by one, the grout material 8 leaks from the joint gap to be injected through the gap between the lateral tightening holes 7 and the sheath 1. Can be prevented, so that the grout material 8 can be completely injected and filled into the joint gap.

[Brief description of drawings]

1 to 12 show an embodiment of the present invention, and FIG. 1 is a vertical sectional front view showing a state in which members constituting a substructure under a roadbed are press-fitted and installed in the ground. The figure is first
FIG. 4 is an enlarged vertical front view showing a part of the drawing, and FIG. 3 is a vertical front view showing a state in which a sheath with a sealing tube is inserted and set over a large number of Pca members in the ceiling and the upper steel box girder,
FIG. 6 is a vertical sectional front view showing a state in which a curable grout material is filled between the joint gaps and the sheath and the horizontal fastening holes, and FIG. 5 is a vertical sectional front view showing a part of FIG. 4 in an enlarged manner. Is a vertical sectional front view showing a part of the underground structure which has completed horizontal fastening and pouring and filling of grout material, FIG. 7 is a vertical sectional front view showing an enlarged part of FIG. 6, and FIG. 8 is FIG. FIG. 3 is a vertical cross-sectional front view showing the vicinity of the rubber seal cylinder in FIG. 9 to 12 show a sheath with a seal tube used in an embodiment of the present invention. FIG. 9 is a partially cutaway vertical side view, and FIG. 10 is an enlarged view of the tip side portion. FIG. 11 is an enlarged vertical side view showing an intermediate portion, and FIG. 12 is an enlarged vertical side view showing a base end side portion. FIG. 13 is a vertical sectional front view showing a conventional roadbed crossing structure, and FIG. 14 is an enlarged vertical sectional front view showing a part of FIG. In the figure, 1 is a sheath, 2 is a rubber seal tube, 3 is a vent hole, 4 is a sheath with a seal tube, 5 is a precast concrete member (Pca member), 6 is an underground structure, 7 is a horizontal fastening hole, and 8 is Curable grout, 9 is upper steel box girder, 10 is
Pca member, 11 is a lower steel box girder, 14 is a horizontal tightening hole, 15 is an anchor plate, 16 is a fixing tool, 23 is a rubber hose for air supply, 25
Is a closing plate, 26 is a horizontally tightened PC steel material, 27 is a grout material, 28 is an injection hole, and 29 is a horizontally tightened PC steel material.

Claims (1)

[Claims] 1. A large number of rubber seal cylinders 2 are fitted on the outside of a sheath 1 whose both ends are closed at intervals in the longitudinal direction of the sheath, and both ends of each rubber seal cylinder 2 are attached to the sheath 1. Against airtightness, the sheath 1 is provided with a vent hole 3 inside each rubber seal tube 2 to form a sheath 4 with a seal tube, and the sheath 4 with a seal tube is arranged in parallel. After inserting through the lateral fastening hole 7 of each precast concrete member 5 in the underground structure 6 having the precast concrete member 5, and after disposing the rubber seal cylinder 2 in the lateral fastening hole 7 of each precast concrete member 5, Compressed air is supplied into the rubber seal tube 2 from the end of the sheath 1 through the inside of the sheath and the ventilation hole 3 to expand the rubber seal tube 2 by air pressure. Is pressed against the Kiyoko fastening hole 7, then adjacent to the joint gap between the precast concrete part,
A method for injecting and filling grout material between precast concrete members in an underground structure in which the curable grout material 8 is sequentially injected and filled one by one.