JPH01322096A - Working method for underground structure and propelling device for roof cylindrical body - Google Patents

Abstract

PURPOSE:To enable a simple and quick work by connecting a propelling device for a roof cylindrical body fixed with a small jack within a short cylinder to the back of the roof cylinder, and advancing an underground structure as a reaction member located aft of the propelling device. CONSTITUTION:A small jack 12 projectable afterward is fixed within a short cylinder connectable to a roof cylindrical body 6 and having the same diameter as the body 6, thereby forming a propeller device 20. Then, a sheet pile 2 is erected and a pressing machine is installed in a built-up start pile 3. The cylindrical body 6 is pressed toward a target pile 4 and a plurality of the bodies 6 are arranged in sequence. Thereafter, the device 20 is fitted to the rear end of the body 6 and an underground structure 9 is located aft. Furthermore, a jack 12 is extended with a reaction force from the structure 9 and each cylindrical body 6 is pushed to advance in sequence, except for a friction cutter 7. Upon propelling each of the bodies 6, the jack 12 is made to contract and a traction jack 28 is extended to propel the structure 9. The aforesaid process is repeated to carry out a work.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to the construction of a large-scale underground structure that obstructs upper traffic during the construction of a large underground structure in a transverse direction under the ground of railways, roads, etc. This article relates to methods and equipment for constructing underground structures that can be constructed without any construction work.

[Conventional technology] In order to excavate a large underground structure in a transverse direction under the ground of railways, roads, etc., protection works to support the upper traffic are required, and steel pipes, etc. are arranged horizontally in parallel. One example is the provision of a vibrator roof.

However, if a pipe roof is formed as a separate construction work and the underground structure is constructed by excavating the inside of the pipe roof, or if the underground structure is excavated under the pipe roof, this vibration roof may exist. The more you do this, the thicker the soil will become. Moreover, the protection work for constructing the bib roof is separate work from the main work for burying the underground structure, which increases the construction cost and construction period.

Therefore, the inventors invented a method for constructing underground structures as shown in Figures 15 to 17, and filed a patent application for
No. 8 (Japanese Unexamined Patent Publication No. 19312/1983), etc.

The method of implementing this underground structure will be explained, thus clarifying the purpose of the invention.

As shown in FIG. 15, an earth retaining steel sheet pile 2 is driven beside the railway upper traffic 1, a starting shaft 3 and a reaching shaft 4 are constructed, and a press-in machine 5 is installed in the starting shaft 3. With this, the roof cylinder 6 is press-fitted toward the reaching hole 4.

FIG. 18 is a front view of the roof cylinder 6, which is a steel pipe with a rectangular cross section, and has hook-shaped joints 6a and 6b formed continuously in the longitudinal direction on the side surfaces, and a friction cutter 7 made of a flat plate on the top surface. is installed.

Further, the press-fitting machine 5 has an extrusion mechanism using a shank or the like for the cylindrical body 6, and an internal excavation mechanism for the cylindrical body 6 using an auger or the like.

In addition, the roof cylinder 6 can be connected sequentially in the length direction to embed the required length, and the joint 6a.

They are arranged in parallel while being continuous in the lateral direction via 6b.

This arrangement can be selected from various ways, such as a single letter shape, a concave shape, and a rectangular chevron shape.

Next, as shown in FIG. 16, a reaction wall 8,
An underground structure 9 made of a concrete box is set up, a propulsion jack 10 is provided between the reaction wall 8 and the underground structure 9, a cutting edge 11 is provided at the tip of the underground structure 9, and the tip of the underground structure 9 is A small jack 12 is interposed between the roof cylinder 6 and the roof cylinder 6.

In the figure, 13 is a support member for the roof cylinder 6, 14 is a stopper member for the friction counter 7, and these are provided on the side of the starting shaft 3.
On the other hand, a pedestal 15 is provided on the reaching shaft 4 side.

Extend the small jack 12 and use the underground structure 9 as a reaction force to remove the roof cylinder 6 while leaving the friction cutter 7.
When the books are pushed one by one and the cylinder 6 moves forward,
The small jack 12 is retracted, and the propulsion jack 10 is then extended to excavate the underground structure 9. In the figure, reference numeral 16 indicates a strut interposed between the propulsion jaw 10 and the underground structure 9.

In this way, the advancement of the roof cylinder 6 and the underground structure 9
While repeating this process alternately, the roof cylinders 6 that have come out into the reaching hole 4 are sequentially removed.

When the tip of the underground structure 9 reaches the reaching shaft 4, the cutting edge 11 and the like are removed and back-filling grout 1~ is performed as appropriate to complete the construction.

The underground structure 9 is made of precast concrete 1.
The boxes may be successively lowered into the starting shaft 3 and connected, or the required length may be increased by pouring concrete within the starting shaft 3.

In addition, regarding the method of propelling the underground structure 9, a reaction wall and a center hole type traction jack are installed on the reaching shaft 4 side, and a traction member made of P and C steel wires with one end fixed to the underground structure 9 is used. It is also possible to pull the underground structure 9 from the reaching shaft 4 side by pulling it with a towing jack.

Furthermore, the roof cylinder 6 does not necessarily have to be long enough to penetrate the reaching shaft 4 and be press-fitted into the ground from the beginning, but the short roof cylinder 6 may be advanced sequentially together with the underground structure 9. good.

(Problems to be Solved by the Invention) The method for implementing underground structures shown in FIGS. 15 to 17 is as follows:
Since the protection work for the underground structure to be dug underground is carried out at the same time as the digging of the underground structure without having to be carried out in advance, the work can be carried out safely and reliably at a low cost, and the overlay can also be carried out shallowly.

By the way, the small jack for propelling the roof cylinder was attached to the underground structure side. For example, in the above-mentioned Japanese Patent Laid-Open No. 55-19312, a holding frame is provided, and a small jack is provided within this holding frame.

On the other hand, when the roof cylindrical body is pressed into the ground with a press-fitting machine, it is not possible to close the end because the earth and sand inside the cylinder is discharged on the starting shaft side, but since it is propelled with a small jack, this is the case. A blockage point must be provided at the end of the cylinder where the small jack comes into contact.

In this way, it is extremely difficult to install small jacks on the underground structure side one by one to match the roof cylinders, and to close off the ends of each roof cylinder in order to secure a place to press with the small jacks. It took a lot of time and effort.

The object of the present invention is to solve the above-mentioned disadvantages of the conventional example, and to provide a method for constructing an underground structure and a roof cylinder, which can easily and quickly install a small jack for propelling the roof cylinder, thereby streamlining construction. The objective is to provide a propulsion device.

[Means to solve the problem]

In order to achieve the above object, the present invention has the roof cylinders horizontally press-fitted into the ground from the starting shaft and arranged in parallel, and the rear end of the roof cylinders remaining in the starting shaft having the same diameter as the roof cylinder. Then, a roof cylindrical propulsion device in which a small jack is fixed in a short cylindrical body connectable to the rear end of the roof cylindrical body so as to be able to protrude to the rear of the short cylindrical body is connected, and this roof cylindrical propulsion device is connected. An underground structure is installed at the rear, and the underground structure is used as a reaction force to push the roof cylinder forward using a small jack inside the short cylinder.
The main idea is to excavate the underground structure using conventional construction methods.

[Function] According to the present invention, a small jack can be centered by simply connecting the short cylinder to the end of the roof cylinder by welding or the like, and by extending this small jack, the underground structure can be used as a reaction force to release the roof cylinder. I can push my body forward.

(Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

First, the roof cylindrical propulsion device 20 of the present invention is shown in FIGS.
Explaining FIG. 14, 6 in the figure is a cylinder for the roof, and it is inserted into a short cylinder 21 having the same diameter as the cylinder 6 so that it can be welded to the cylinder 6, and can protrude rearward therefrom. A small jack 12 was fixed. Pore I and fastening can be considered as the fixing method, but in this embodiment, the pressure wall 22 to which one end of the small jack 12 is connected is placed parallel to the opening surface of the short cylinder 21.
The rear surface is surrounded in the orthogonal direction by a supporting frame 23, so that the small jack 12 can be stored in and taken out freely.

The small jack 12 inserted into the support frame 23 from the rear end opening 21a of the short cylindrical body 2 has its tip abutted against the pressing wall 22 and becomes fixed. In addition, in order to replace this small jack 12 for repair or the like, it can be taken out of the short cylinder body 21 by simply pulling it out from the supporting frame 23.

Furthermore, an eaves 24 may be attached to the rear end of the short cylindrical body 21 to extend the top plate of the cylindrical body 21.

In this embodiment, the eaves 24 is provided with a hanging side plate 25 on the side where it joins to the cylinder body 21. The eaves 24 is a flat plate, and the side plates 25 are welded so as to be perpendicular to this flat plate. However, since the short cylinder 21 has rounded corners like the roof cylinder 6, the eaves 24 and side plates cannot be attached as they are. 25 to the cylinder body 21
cannot be completely joined to the edges.

Therefore, an angle member 26 is provided at the upper corner of the short cylindrical body 21 to form a corner, and the shapes of the two ends are matched and welded.

In addition, as shown in FIG. 12, the length of the eaves 24 is longer than the protrusion length from the rear end opening 21a of the small jack 12 when it is fully extended, so that its tip can overlap the front end of the underground structure 9. . Further, as described above, the hanging side plate 25 is located on the side where the eaves 24 is joined to the cylinder body 21, and its width may be narrow. In the figure, reference numeral 26 denotes a pressing member provided on the side of the underground structure 9, which is opposed to the small jack 12.

Next, a construction method of the present invention using such a cylindrical roof propulsion device 20 will be explained.

Figures 1 to 10 are side views of each process showing one embodiment of the method for constructing an underground structure according to the present invention, and the same components as those in Figures 1 to 10 showing the conventional example are referred to the same reference. They are numbered.

As shown in Fig. 1, earth retaining steel sheet piles 2 are driven, and as shown in Fig. 2, a starting shaft 3 and a reaching shaft 4 are constructed.
It is the same as the conventional example in that a press-fitting machine 5 is installed inside, and the roof cylinders 6 as shown in FIG. 18 are press-fitted toward the reaching hole 4, and the roof cylinders 6 are arranged in parallel. It is.

Next, as shown in FIG. 3, a short cylindrical body 21 is welded to the rear end of the roof cylindrical body 6 exposed in the starting shaft 3, and the roof cylindrical body propulsion device 20 is attached.

As shown in FIG. 4, an underground structure 9 consisting of a concrete 1-box is located behind the cylindrical roof propulsion device 20 in the launch shaft 3.
At this time, if the short cylindrical body 21 of the propulsion device 20 has an eave 24, its rear end is deeply overlapped with the front end of the underground structure 9, and the hanging side plate 25 is joined to the front end of the underground structure 9. I'll do what I do. By doing this, the underground structure 9
The pressing member 26 at the front end is surrounded by the eaves 24 and side plates 25 to prevent dirt from entering.

In this embodiment, a reaction wall 27 and a center-hole type traction jack 28 are provided on the reaching shaft 4 side, and a traction member 29 made of a P, cm wire, etc., whose one end is fixed to the underground structure 9 is pulled by this traction jack 28. As a result, the underground structure 9 is pulled in from the reaching shaft 4 side, but as in the conventional example, a reaction wall and a propulsion jack may be provided in the starting shaft 3 to push out the underground structure 9. .

In addition, the blade 11 attached to the front end of the underground structure is the propulsion device 2.
0, and a supporting member 13 was provided inside it.

The underground structure 9 may be constructed by sequentially lowering precast concrete boxes into the starting shaft 3 and connecting them, or by pouring concrete 1- into the starting shaft 3 to form the required length. may be added.

As shown in FIG. 5, when the small jack 12 is extended and the underground structure 9 is used as a reaction force to push the roof cylinder 6 one by one while leaving the friction cutter 7, the cylinder 6 moves forward. For example, the small jack 12 is retracted, and the traction jack 28 is then extended to propel the underground structure 9.

When the roof cylindrical body 6 is pushed forward as described above, the small jacks 12 extend and the overlapping length between the eaves 24 and the underground structure 9 decreases, but the rear end of the eaves 24 still remains overlapping, and this The presence of the eaves 24 prevents external earth and sand from falling and entering the underground structure 9 and the short cylindrical body 21. In this case, a gap is created between the side plate 25 and the underground structure 9, but since the time the small jack 12 is extended is shorter than the time it is contracted, the earth and sand will not flow out from the gap. Quantity is hardly an issue.

In this way, the advancement of the roof cylinder 6 and the underground structure 9
While repeating this process alternately, the roof cylindrical body 6 that has come out into the reaching hole 4 is removed one by one.

Further, in this embodiment, an intermediate push jack 30 is arranged in the middle of the underground structure 9, and when the underground structure 9 is propelled, the push jack 30 pushes out the front object using the rear object as a reaction force. .

FIGS. 6 to 8 show the progress of the underground structure 9 by both such traction and extrusion.

When the cutting edge 11 reaches the reaching hole 4 as shown in FIG. Concrete was poured in the existing areas to complete the construction.

〔Effect of the invention〕

As described above, the underground structure enforcement method and roof cylindrical propulsion device of the present invention allow a small jack for propelling a roof cylindrical body to be installed easily and quickly, and the small jack can be left as is. Since it is possible to extrude the roof cylindrical body, the number of steps can be reduced and construction can be streamlined, reducing construction costs and construction time.

Furthermore, according to the third aspect of the present invention, it is possible to constantly close the gap that changes according to the expansion and contraction of the small jack, thereby effectively preventing the inflow of earth and sand.

[Brief explanation of the drawing]

Figures 1 to 10 are side views of each process showing one embodiment of the method for constructing an underground structure of the present invention, and Figure 11 is a vertical cross-sectional front view showing one embodiment of the roof cylindrical propulsion device of the present invention. Figure 12 is a cross-sectional plan view of the same as above, Figure 13 is a side view of the main parts of the same, Figure 1 is
Figure 4 is a perspective view of the same as above, Figures 15 to 17 are side views showing each step of the conventional construction method for underground structures, and Figure 18 is a front view of the roof cylinder. ■...Upper traffic 2...Earth retaining steel sheet pile 3...
・Starting hole 4... Arrival hole 5... Press-in machine
6... Roof cylinder 7... Friction cutter 8... Reaction wall 9... Underground structure 10.
...Propulsion jack 11...Blade tip 12...Small jack 13...Support material 14...Stopping member
15... pedestal 16... strut 1- 20... cylindrical body propulsion device for roof 21... short cylindrical body 21a... rear end opening 2
2... Pressing wall 23... Support frame 24...
Eave 25... Drooping side plate 26... Press member 27... Reaction wall 28... Traction jack 29... Traction member 30... Intermediate push jack

Claims (3)

[Claims] (1) Press the roof cylinders horizontally into the ground from the starting shaft and arrange them in parallel, and place a roof cylinder with the same diameter as the roof cylinder at the rear end of the roof cylinder remaining in the starting shaft. A roof cylindrical propulsion device is connected to a short cylindrical body that can be connected to the rear end, and a small jack is fixed to the short cylindrical body so as to be able to protrude to the rear, and an underground structure is installed behind the roof cylindrical propulsion device. A construction method for an underground structure, characterized in that the underground structure is used as a reaction force member to push the roof cylinder using a small jack inside the short cylinder, and the underground structure is excavated using conventional construction methods. . (2) A roof tube having the same diameter as the roof tube and having a small jack fixed in the short tube that can be connected to the rear end of the roof tube so as to be able to protrude to the rear of the short tube. Body propulsion device. (3) The method for implementing an underground structure according to claim 1 and the promotion of a roof cylinder according to claim 2, wherein the short cylinder has an eave that overlaps the front end of the underground structure at the rear end. Device.