JPH02171496A - Axial reinforcement joint for directly placed concrete lining method and press ring therewith - Google Patents

Abstract

PURPOSE:To make improvements in operation efficiency by connecting a press ring to an axial reinforcement joint, consisting of an inner cylinder and an outer cylinder being engaged with the former and an engaged tooth group allowing movements of one direction alone, via a step part in a press ring through hole. CONSTITUTION:An axial reinforcement joint 17 is attached to a screw part 16a of an axial reinforcing bar 16 via an internal thread 20 after inserting an embedded gable form 15. Next, an outer cylinder 19 is connected to a step part 14a of a through hole 14 and a press ring 9 to an end face of the outer cylinder 19, respectively, through the embedded gable form 15, and then fresh concrete is filled up therein. In succession, a form 15 is moved up to a position of 15A via the press ring together with a ring 22 of an inner cylinder 18 and the joint 17 being engaged with an engaged tooth group allowing movements in one direction alone. Afterward, the press ring 9 is pulled out in the state that the form 15 is checked of its reverse movement by the outer cylinder 19 via the reinforcing bar 16. With this constitution, operation efficiency is thus improvable.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to direct cast concrete lining methods (E, C, L,
This invention relates to an axial reinforcing bar joint for use in construction methods) and a press ring for using the same.

(Prior art) In recent years, E, C,
The L. construction method is attracting attention, and its outline is as shown in Figure 6.
First, the reinforcing bars 2 and the inner formwork 3 are assembled inside the inner formwork, fresh concrete 4 is placed between the inner formwork 3 and the tail plate la, and then the thrust of the shield jack 5 is applied to the inner formwork 3. At the same time, the thrust force of the press jack 6 is applied to the fresh concrete 4 immediately after pouring via the press ring 7 which is the end formwork, and the shield machine 1 is propelled while filling the fresh concrete 4 into the tail voids formed sequentially. Depending on the situation, a concrete lining W will be constructed behind it.

(Problems to be Solved by the Invention) In the E, C, L construction method using the conventional press ring 7, the fresh concrete 4 pressurized and consolidated by the press jack 6 is moved forward in the tail play) 1a. The press ring 7 is moved forward in order to move on to the next process before the solidification has fully progressed, as it is subject to soil water pressure that occurs in the ground and has its own resilience due to being compacted. That is, if the shield machine 1 is pulled out in the direction of movement, the fresh concrete 4 will be moved and deformed and flow out to the front side.
It is necessary to wait for assimilation of the fresh concrete 4 without pulling out the press ring 7 until the strength of the directly poured fresh concrete 4 reaches a certain level. This was a hindering factor.

The present invention has been made with the main purpose of solving the above-mentioned problems, and provides an axial reinforcing bar joint for direct pouring concrete lining method that allows the next process to proceed without waiting for the solidification of fresh concrete, and the same. The purpose is to provide press rings for use with.

(Means for Solving the Problems) In order to achieve the above object, an axial reinforcing bar joint for direct cast concrete lining construction method according to the present invention is an axial reinforcing bar joint used in the shield construction method, and each end face A short cylindrical body with an internal thread into which the threaded part formed at the end of the axial reinforcing bar is screwed.A ring groove is formed on the outer circumferential surface of the short cylindrical body, and the ring groove is elastically deformable in the radial direction. An inner cylinder having a ring fitted thereon, and a cylindrical body of a required length that is externally fitted onto the inner cylinder so as to be freely displaceable in the central axis direction, and the ring is engaged with the inner circumferential surface of the cylinder in a stepwise manner. It consists of an outer cylinder in which a group of locking teeth with a corrugated cross section are carved to allow movement in only one direction along the central axis of the inner cylinder.

When using the above-mentioned axial reinforcing bar joint, a press ring according to the present invention is used, and this press ring is constructed as follows. That is, it is formed into a ring body, and through holes extending in the direction of the central axis are provided at predetermined intervals in the circumferential direction on the end face of the ring body, and a stepped portion is formed in the middle of the through hole in the longitudinal direction, and each part is formed in the through hole. There are two configurations: one with and without a predetermined size.

(Function) The outer cylinder presses and supports the filler end formwork with its end face in the movement permissible direction to restrict its positional movement, and is also pressed and moved in the movement permissible direction as necessary through the through hole of the press ring. It is operated and works together with the press ring to interlock and displace the filling gable form, and to put it in a reverse movement restricted state via the ring of the inner cylinder.

Due to the functions of the inner cylinder and outer cylinder, the fill-in gable formwork can handle the gable part of directly poured fresh concrete without any inconvenience in the E, C, L construction methods without the aid of a press ring. It becomes something that can be kept.

(Example) Hereinafter, specific examples of the present invention will be described in detail based on the drawings.

Figure 1 is a sectional view showing the surroundings of the press ring, and
The figure is a sectional view showing the vicinity of an axial reinforcing bar joint. Note that the same reference numerals are given to the parts that are substantially the same as those in the conventional art, and the description thereof will be omitted.

In the figure, reference numeral 8 denotes a ring body abutting the end of the inner formwork 3, which receives the thrust of the shield jack 5 and supports the press jack 6.

Reference numeral 9 denotes a press ring according to the present invention that is pressed by the press jack 6, and is entirely ring-shaped, and includes an outer ring body 11 that slides into contact with the inner circumferential surface of the tail plate la via a seal member IO; It consists of an inner ring body 13 that also slides into contact with the outer peripheral surface of the inner formwork 3 via a sealing member 12.

The inner ring body 13 has through holes 14 formed along the central axis direction of the inner ring weight 3 at appropriate intervals in the circumferential direction of the end surface thereof, and the through holes 14 have a stepped portion 14a midway in the longitudinal direction. Formed configuration. Each of the through holes 14
is for accommodating an axial reinforcing joint, which will be described later, and each part thereof is set to a certain size to perform the required function.

Reference numeral 15 designates fill-in gable molds arranged at regular intervals, the overall shape of which is a donut disk shape, and the through holes 15 of a constant diameter arranged in the same manner as the through holes 14 are formed on the radial surface thereof.
It forms a.

Further, reference numeral 16 denotes an axial reinforcing bar embedded in the fresh concrete 4 directly cast between the tail plate la and the inner formwork 3, and its total length is the same as that of the filler end formwork 15.
17 is an axial reinforcing bar joint according to the present invention, which is used to connect the axial reinforcing bars 16 to each other. , its structure is as follows. That is, it consists of an inner cylinder 18 and an outer cylinder 19, and the inner cylinder 18 is a short cylinder having an internal screw 20 into which the screw part 16a provided at the end of the axial reinforcing bar 16 is screwed from each end side. A ring groove 21 is formed on the outer peripheral surface of the ring groove 21, and a ring 22 formed to be elastically deformable in the radial direction is fitted into the ring groove 21 as shown in FIG. 18, the ring 22 is engaged with the inner circumferential surface of the cylinder in a stepwise manner so that the ring 22 can be moved in only one direction along the inner cylinder 18. A group of engagement teeth 23 with an acceptable cross-sectional waveform are carved.

FIG. 3 shows a modified example (state B in which the shielding machine 1 is displaced relative to the inner formwork 3), and in this way, the press ring 9° is shielded between the outer ring body 11 and the inner ring body 13. Freely displaced in the direction perpendicular to the axis. At this time, the filling gable formwork 15' may be modified as appropriate. The press jack 6 has a vertical and horizontal hinge structure that allows it to be used even in an inclined position due to the above displacement.

Next, an example of use of the axial reinforcing bar joint 17 and press ring 9 having the above configuration will be described. First, as shown in FIG. 5, the next axial reinforcing bars 16 are added to the axial reinforcing bars 16 of the existing concrete lining W, and the filling gable formwork 1 is added.
5 is placed by inserting the axial reinforcing bar 16 into the through hole 15a of the axial reinforcing bar 16, and then the threaded portion 1 of the axial reinforcing bar 16 is
The axial reinforcing bar joint 17 is screwed onto the 6a through its inner screw 20, and the press ring 9 is placed at a fixed position.
Thereafter, the inner formwork 3 is positioned to form a new section S enclosed on three sides by the tail play 1a, the inner formwork 3, and the existing concrete lining W.

At this time, as shown in FIG. 2, the outer cylinder 19 of the axial reinforcing bar joint 17 is accommodated in the through hole 14 so that the end face m on the side in the movement permissible direction is substantially aligned with the rear face n of the press ring 9. It will be in the same state. After that, fresh concrete 4 is poured directly through an appropriate supply port p, and the section S is filled with fresh concrete 4. Afterwards, the shield jack 5 is operated to extend, and at the same time, the press jack 6 is also extended. Make it work. As a result, the shield machine 1 moves forward, and the directly poured fresh concrete 4 fills up the pressing force of the press ring 9 and is applied via the gable formwork 15, and the fresh concrete 4 interferes with the tail void. It will be filled without any problem. Then, by the extension operation of the press jack 6, the filling gable formwork 15 is moved together with the outer cylinder 19 to the position indicated by the two-dot chain line 15A via the press ring 9, and the press jack 6 presses and supports the back of the filling gable form 15, and the fresh concrete is The end portion of the press ring 4 is held, but in this case, the press ring 9 is immediately pulled forward from this state to move on to the next step. At this time, the filling gable formwork 15 is under pressure from the fresh concrete 4, but the outer cylinder 19 prevents its backward movement via the axial reinforcing bars 16 at the end face m on the side in the movement permissible direction. This prevents the concrete 4 from moving and deforming and flowing forward. Thereafter, the same steps as described above are repeated, and the cross-sectional state of the concrete lining W thus formed is as shown in FIG. 5.

(Effects of the Invention) According to the axial reinforcing bar joint 17 and press ring 9 of the present invention as described above, the end portion of fresh concrete 4 directly cast in the ECL method is filled without relying on the press ring 9. It is now possible to support the killing gable formwork 15 alone, and therefore the press ring 9 can be moved forward without waiting for the directly poured fresh concrete 4 to harden, resulting in a dramatic improvement in work efficiency. It will be done.

Furthermore, since the axial reinforcing bar joint 17 connects the axial reinforcing bars 16 with screws, it has superior rigidity compared to conventional lap joints. It has been difficult to secure the seal between the hole and the axial reinforcing bar 2 inserted through it, but when using the axial reinforcing bar joint 17, it is relatively easy to ensure this. There is profit.

[Brief explanation of the drawing]

1 to 3 relate to the present invention; FIG. 1 is a partial sectional view around the press jack, FIG. 2 is a sectional view around the axial reinforcing bar joint, FIG. 3 is a view showing a modified example, and FIG. The figure is a sectional view taken along the line A-A in FIG. 2, FIG. 5 is a cross-sectional explanatory view showing the procedure for constructing a concrete lining, and FIG. 6 is a diagram of a conventional example. 14... Through hole, 1... Axial reinforcing bar, 16a - Axial reinforcing bar joint, 18 Outer cylinder, 20... Inner screw, 22... Ring, 23 4a... Step part, 16...・Threaded portion, 17... Inner cylinder, 19... 21... Ring groove, ... Locking tooth group, Patent Applicant

Claims (1)

[Claims] 1. Axial reinforcing bar joint used in shield construction method (
17), the internal screw (
A short cylindrical body with a ring groove (21) formed on its outer peripheral surface.
) and a ring (22) which is elastically deformable in the radial direction is fitted into the ring groove (21).
), the ring (22) is engaged with the inner circumferential surface of the cylinder in a stepwise manner, and the ring (22) is engaged with the inner peripheral surface of the cylinder in a stepwise manner, and A shaft for a direct cast concrete lining method, comprising an outer cylinder (19) carved with a group of locking teeth (23) with a corrugated cross section that allows movement in only one direction along the shaft. Directional reinforcing bar joints. 2. It is a ring body, and a through hole (14) extending in the central axis direction is provided at a predetermined interval in the circumferential direction on the end surface of the ring body, and this through hole (14) has a step part (14a) in the middle in the longitudinal direction. )
A press ring for use in an axial reinforcing bar joint for a direct cast concrete lining method, characterized in that the outer cylinder (19) is configured to be pressable.