JPH0415360B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to pipes for pipe roofs used when constructing underground structures across roads, under rail tracks, etc., and to methods for burying underground structures using the pipes. It is something.

(Prior art) Conventionally, as a method of constructing an underground passage that crosses under a road or under the rails, a starting shaft and a reaching shaft of appropriate depth are excavated on both sides of the road or under the rails, as shown in Fig. 11. As shown in Figure 2, this is done by using a rectangular pipe b, which is made by replacing the entire length of a long thin plate c on one side in contact with the ground a, and fixing the tip of the long thin plate c integrally to the tip of the long thin plate c. After rectangular pipes b are placed in parallel from the starting shaft to the destination shaft along the outer circumferential cross section of the planned underground structure d,
A ready-made underground structure is followed by the rear end of the pipe roof made of these parallel pipes and propelled from the starting shaft, and while the elongated plate c remains underground, the pipe roof is advanced and the earth and sand inside the underground structure are removed. Underground structures are buried underground by excavating them.

In such underground structure methods, there are two methods for press-fitting the underground structure into the ground: a method of pushing the underground structure with a propulsion jack, and a method of towing the underground structure from the buried side. The traction force and traction force are mainly determined by the following resistance forces.

Contact resistance force between the elongated plate and the rectangular pipe Contact resistance between the inner surface of the pipe roof and the ground Contact resistance between the bottom of underground structures, etc. and the ground Contact resistance force between the elongated plate and the underground structure.

Therefore, the reaction wall for supporting the reaction force generated by pressing or pulling must have a proof force greater than the above contact resistance force, and such contact resistance force increases as the underground structure becomes larger. , and the more the ground is clayey, the larger it becomes.

(Problem to be solved by the invention) For this reason, according to the conventional method for burying underground structures, the structure of the reaction wall increases in size due to the total increase in the contact resistance forces described above. It becomes necessary to adopt auxiliary construction methods, which not only requires a large construction cost but also prolongs the construction period, and requires a lot of time and effort to remove the reaction wall after the underground structure is buried. There were other problems.

The object of the present invention is to provide a pipe for a pipe roof and a method for burying the pipe in an underground structure, which can solve these problems.

(Means for Solving the Problems) In order to achieve the above object, the pipe roof pipe of the present invention is a rectangular pipe with a rectangular cross section, and a long thin plate is provided over the entire length on two opposite sides of the pipe in contact with the ground. The tip of the elongated plate and the tip of the rectangular pipe are fixed together, and a rolling material or an anti-friction agent is interposed between the elongated plate and the rectangular pipe. The method for burying an underground structure using this pipe for roofing is to place a long thin plate over its entire length on two opposite sides that contact the ground, and to place the tip of the long thin plate at the tip. An underground structure in which a plurality of rectangular pipes are fixed and are formed by interposing a rolling material or a lubricant between the elongated plates and the rectangular pipes, and the elongated plates are buried in the outer periphery of the buried position of the underground structure. The process of forming a pipe roof by press-fitting and burying the pipes in parallel so that they are located on the inner and outer peripheral surfaces of the pipes, and unfastening the tips of the elongated plates on which the square pipes are placed and each square pipe that forms the pipe roof. At the same time, there is a step of fixing at least the rear end of the elongated plate on the outside surface of the underground structure to the ground, etc., and a step of bringing the front end surface of the underground structure into contact with the rear end surface of the pipe roof, and fixing the outer peripheral surface of the underground structure to the pipe roof. The underground structure is press-fitted into the ground along the inner surface of the outer elongated plate placed on each square pipe, and the pipe roof is pushed forward with the elongated plate remaining, and the earth and sand that invades the inside of the underground structure is excavated and removed. The method is characterized in that a pipe roof and an underground structure are replaced by a step of replacing the pipe roof with the underground structure.

(Function) The rectangular pipe with a rectangular cross section that forms the pipe roof has elongated plates placed along its entire length on two opposite sides of the inner and outer peripheral surfaces of the underground structure that contact the ground. Due to the pressure from the underground structure that is subsequently propelled, the rectangular pipe moves forward while slidingly contacting the opposing surfaces of the inner and outer elongated plates that are left underground without touching the ground, and the elongated plate and the rectangular pipe move forward. Since a rolling material or an anti-friction material is interposed between the two, the sliding friction force is significantly reduced. Therefore, the contact resistance force is smaller than that of contact with the ground, and the outer circumferential surface of the underground structure is also propelled using these outer elongated plates as a guide, so the contact resistance force between the two is reduced.

For this reason, even underground structures with large sections or long lengths can be buried smoothly using small-scale reaction walls, and underground structures can be easily buried on pipe roofs even in clayey soil. can be replaced with

(Embodiment) To explain an embodiment of the present invention with reference to the drawings, a relatively shallow starting shaft 2 and a reaching shaft 3 are excavated on both sides of a road or rail 1, etc. Next, a rectangular pipe 4 having a rectangular cross section is horizontally press-fitted from the starting shaft 2 side toward the reaching shaft 3 so as to penetrate therethrough.

This rectangular pipe 4 is formed so that the dimension between two opposing sides is slightly larger than the wall thickness of the underground structure 5 to be buried. Elongated plates 6 and 7 made of band-shaped steel plates having substantially the same planar shape as 4 are disposed, and only the tips of the elongated plates 6 and 7 are fixed to the tip of the rectangular pipe 4 by welding 21 or the like.

5 and 6 show a modification of the arrangement of the elongated plates 6, 7 with respect to the rectangular pipe 4, and there are particles such as sand or steel balls between the elongated plates 6, 7 and the rectangular pipe 4. The frictional force is reduced by interposing an anti-friction agent 8 made of a rotary material such as a circular rod such as a round steel rod or an oil agent.

FIGS. 7 and 8 show further examples of modified arrangement of the elongated plates 6 and 7 on the square pipe 4,
A lubricant 9 such as oil or bentonite is placed inside the square pipe 4.
A supply pipe 10 is provided, and the tip of the supply pipe 10 is passed through the rectangular pipe 4 at a proper place to connect the elongated plates 6, 7.
A lubricant 9 is supplied between the rectangular pipe 4 and the elongated plates 6 and 7 to reduce the frictional force between them.

This means of supplying the lubricant 9 between the rectangular pipe 4 and the elongated plates 6 and 7 is suitable when the elongated plates 6 and 7 buried in the side positions of the underground structure 5 are in a vertical position. .

If this supply of lubricant 9 and the anti-friction material 8 are used together, the frictional force can be further reduced.

In order to bury the hollow underground structure 5 using the rectangular pipe 4 having the elongated plate formed in this way,
First, the rectangular pipe 4 is pushed in from the starting shaft 2 toward the reaching shaft 3 while excavating the ground with an auger (not shown) inserted into the shaft.

One square pipe 4 is a starting shaft 2 and a reaching shaft 3
When buried between them, the engaging protrusions 4a and 4b provided on both sides of this square pipe 4 are replaced with the engaging protrusions 4a and 4b provided on the opposite side of the next square pipe 4 to be press-fitted. 4b while engaging with each other, and by repeating this process, as shown in Fig. 2, a plurality of rectangular pipes 4, 4...4 are buried in the upper part and both sides of the planned underground passage consisting of the underground structure 5 to be buried. A pipe roof is formed in parallel in a gate shape.

If a short square pipe 4 is used, once one square pipe has been press-fitted, the next square pipe is bolted to its rear end using a joint 11 protruding inside. It is only necessary to connect and press-fit the pipe by repeating this operation and bury it in a straight line between the starting shaft 2 and the reaching shaft 3. In this case, only the rectangular pipe at the front end has a long thin plate 6 at its tip. , 7 are fixed, and the elongated plates 6 and 7 disposed on the following rectangular pipes are not fixed, but are connected with their tip surfaces to the rear end surfaces of the preceding elongated plates 6 and 7 in a butt state. Just leave it there.

After the pipe roof is buried in the ground between the starting shaft 2 and the reaching shaft 3,
A reaction force receiving wall member 13 is erected on a base material 12 fixed to the bottom surface of the base member 12. This reaction force receiving wall member 13 may be fixed to the base material 12 or may be attached so as to be movable in the press-fitting direction.

Further, the rear end of the outer elongated plate 6 of each rectangular pipe 4 of the pipe roof protruding toward the starting plate 2 side is connected to a gate-shaped connecting frame 1 arranged along the outer peripheral surface of the elongated plate 6.
4 by appropriate means such as welding, and the connecting frame 14 and the reaction force receiving wall member 13 are connected by a connecting member 15 such as an anchor. Note that the connecting frame 14 may be appropriately fixed to the ground without using the connecting member 15 such as an anchor.
On the other hand, the tips of the inner and outer elongated plates 6 and 7 of the pipe roof protruding toward the reaching shaft 3 side are cut off to form a rectangular pipe 4.
After releasing the fixation of these elongated plates 6 and 7 to the outer elongated plate 6, a gate-shaped anchoring frame 16 made of reinforced concrete or steel, which is erected along the outer periphery of the outer elongated plate 6, is attached to the ground end surface of the reaching shaft 3. While closely supporting the fixing frame 16, the tips of the outer elongated plates 6 are integrally fixed to the fixing frame 16 by welding or the like.

Further, a plurality of propulsion jacks 17 are attached to the reaction force receiving surface of the reaction force receiving wall member 13, and a press frame 18 is interposed between the propulsion jacks 17 and the rear end surface of the underground structure 5 to be buried.

Furthermore, an intermediate jack frame 19 (see FIG. 9) having approximately the same cross-sectional external dimensions as the underground structure 5 is interposed between the tip surface of the underground structure 5 and the rear end of the pipe roof, and the inner and outer peripheral surfaces of the frame 19 are The inner and outer elongated plates 6, 7 of each rectangular pipe 4 are movable while being in sliding contact with each other, and an intermediate jack 20 is disposed within the intermediate jack frame 19, facing the rear end of each rectangular pipe 4.

Note that the intermediate jacks 20 may be directly connected between each rectangular pipe 4 and the underground structure 5 without disposing such an intermediate jack frame 19.

With this configuration, the intermediate jack frame 20
By sequentially operating the inner jacks and pushing each rectangular pipe 4 a certain length, each rectangular pipe 4 will be guided by the inner and outer elongated plates 6 and 7 that are fixed in contact with the ground, and will move along these elongated plates 6 and 7. The tips of these rectangular pipes 4 move forward while sliding in contact with each other, and reach the vertical shaft 3.
protrude to the side.

In this way, if the propulsion jack 17 is activated on the side of the starting shaft 2 where all the rectangular pipes 4 have been pushed forward for a certain length, the underground structure 5 will be press-fitted into the ground via the push frame 18, and the intermediate jack frame 19 will also be pushed into the jack 20. Move forward while contracting.

When the propulsion jack 17 is extended and the underground structure 5 is press-fitted by a certain length, the propulsion jack 17 is contracted and the next press frame 18 is inserted to add the next press-frame 18, and the underground structure 5 is press-fitted again. conduct.

In this way, when the underground structure 5 is moved forward by the pressure of the propulsion jack 17, the reaction force is received by the reaction force receiving wall member 13, and the reaction force receiving wall member 13 moves backward due to the acting force. However, this reaction force receiving wall member 13 is connected to the rear end of the outer elongated plate 6 of each rectangular pipe 4 via a connecting member 15, and the front end of the elongated plate 6 is connected to the reaching vertical shaft. A fixing frame 1 that is pressed against the ground end surface of the shaft 3 on the 3 side
6, the reaction force receiving wall member 13 is not supported by the rear wall surface of the starting shaft 2 due to the frictional force between the outer surface of the elongated plate 6 and the ground and the receiving force of the ground against the anchoring frame 16. The reaction force is also reliably received at a predetermined position. Therefore, the reaction force receiving wall member 13 can be moved back and forth, and the underground structure 5 can be press-fitted using only one press frame 18.

Further, the underground structure 5 follows the pipe roof and advances along the inner and outer elongated plates 6 and 7 with the peripheral wall interposed between the inner and outer elongated plates 6 and 7.
By interposing an anti-friction material 8 or supplying a lubricant 9 between each square pipe 4 and the elongated plates 6 and 7, the frictional resistance between the two is further reduced, and the extrusion of the square pipe 4 can be performed smoothly. Furthermore, since the inner surface of the inner elongated plate 7 is in contact with the ground, the frictional force with the ground is large, and therefore, the rectangular shape can be maintained even if the rear end is not fixed on the starting shaft 2 side. It does not move forward with pipe 4.

The protruding portion of the rectangular pipe 4 pushed out toward the arrival shaft 3 side by the intermediate jack 20 is appropriately cut off, and the earth and sand within the underground structure 5 is excavated and removed toward the starting shaft 2 side by appropriate means. .

At this time, the inner elongated plate 7 exposed on the inner peripheral surface of the underground structure 5 may be removed, or the outer elongated plate 6 may be removed.
Similarly, the rear end may be connected to the reaction force receiving wall member 13 on the starting shaft 2 side with an anchor or the like.

In this way, when the pipe roof is extruded and the subsequent underground structure 5 is press-fitted into the pipe roof, and one underground structure 5 is press-fitted, the next underground structure 5 is added and press-fitted in the same manner as above. This operation is repeated to replace the pipe roof and the underground structure, and an underground passage consisting of a series of underground structures is constructed between the departure shaft 2 and the arrival shaft 3.

In the above embodiments, the pipe roof is formed in the shape of a gate, but it may also be press-fitted in a straight line shape only at the upper floor position, or it may be press-fitted into the shape of the underground structure 5 as shown in FIG. Square pipes 4 may also be buried in parallel in a portion corresponding to the bottom wall.

Further, although the pushing work of the rectangular pipe 5 is carried out using an intermediate jack 20, it is possible to directly connect the underground structure 5 to the rear end of the pipe roof without using such an intermediate jack 20. It is also possible to push it forward using the jack 17.

(Effects of the Invention) As described above, according to the present invention, a rectangular pipe with a rectangular cross section forming a pipe roof has elongated plates on two opposite sides of the inner and outer peripheral surfaces of the underground structure on the sides that contact the ground. Since the rectangular pipe is placed on the pipe roof for a long time, the pressure from the underground structure that follows the pipe roof causes the rectangular pipe to be shaped into a rectangular pipe using the inner and outer elongated plates that are left in the ground without touching the ground as guides. The plate can be moved forward smoothly and accurately while sliding on the opposing surfaces of the plate.Furthermore, since the slender plate and the rectangular pipe are interposed with a rotary material or anti-friction agent, the rectangular pipe is easily moved against the elongated plate. It is possible to significantly reduce contact resistance force. Therefore, the contact resistance force is smaller than when it comes into contact with the ground, and the inner and outer circumferential surfaces of the underground structure are also propelled using these inner and outer elongated plates as guides, so the contact resistance force between the two is reduced and it is easy to install even on viscous ground. It is possible to construct underground structures.

Furthermore, the structure of the reaction wall can be formed on a small scale, eliminating the need for auxiliary construction methods, and even if the starting shaft is shallow, the specified reaction wall can be erected. This allows even underground structures with large cross sections or long lengths to be buried smoothly.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is a partially vertical simplified side view of the underground structure being press-fitted, Fig. 2 is a simplified longitudinal sectional front view of the press-fitted pipe roof, and Fig. 3 is a simplified longitudinal sectional view of the press-fitted pipe roof. 4 is a longitudinal sectional side view of a part of the square pipe, FIG. 4 is a longitudinal sectional front view thereof, and FIG. 5 is a longitudinal sectional side view of a part of the square pipe when anti-friction material is used.
Fig. 6 and its vertical front view, Fig. 7 is a longitudinal cross-sectional side view of a part of the rectangular pipe when lubricant is used, Fig. 8 is its vertical cross-sectional front view, Fig. 9 is a perspective view of the intermediate jack frame, FIG. 10 is a simplified longitudinal sectional front view showing a modified example of a pipe roof, and FIG. 11 is a simplified longitudinal sectional front view of a pipe roof constructed using a conventional construction method. 2... Starting shaft, 3... Arrival shaft, 4... Square pipe, 5... Underground structure, 6, 7... Long plate,
13... Reaction force receiving wall member, 17... Propulsion jack.

Claims (1)

[Scope of Claims] 1. In a square pipe with a rectangular cross section, a long thin plate is placed over the entire length on two opposite sides of the side in contact with the ground, and the tip of the long thin plate and the tip of the square pipe are fixed together. A pipe for a pipe roof, characterized in that a rolling material or an anti-friction agent is interposed between the elongated plate and the rectangular pipe. 2. The pipe for a pipe roof according to claim 1, characterized in that the lubricant, which is an anti-friction agent, is injected from an injection pipe arranged in the square pipe between the square pipe and the elongated plate. . 3. A long thin plate is placed over the entire length on two opposite sides of the side in contact with the ground, and the tip of the long thin plate is fixed to the tip, and there is a rolling material or anti-friction material between the long thin plate and the rectangular pipe. A plurality of rectangular pipes with a chemical agent interposed therein are placed so that their long plates are located on the inner and outer circumferential surfaces of the underground structure to be buried at the location where the hollow underground structure is buried, and penetrate the entire length of the underground structure. The process of press-fitting and burying the pipes in parallel in advance to form a pipe roof, and unfixing the tips of the elongated plates placed on the square pipes from each square pipe that formed the pipe roof, as well as at least the outer surface of the underground structure. The process of fixing the rear end of the elongated plate to the ground, etc., and bringing the front end surface of the underground structure into contact with the rear end surface of the pipe roof, and placing the outer peripheral surface of the underground structure on each rectangular pipe of the pipe roof. The pipe is constructed by a process of press-fitting the underground structure into the ground along the inner surface of the outer elongated plate and pushing the pipe roof forward while leaving the elongated plate in place, and a process of excavating and removing earth and sand that has entered the inside of the underground structure. A method for burying an underground structure using a pipe for a pipe roof, characterized in that the roof and the underground structure are replaced.