JPH0353433B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a device for supporting the propulsive reaction force on the starting side of an underground structure when building an underground structure by crossing under a road or rail. It is something.

(Conventional technology) Conventionally, as a method of constructing an underground passage that crosses under a road or under rail, a starting shaft and a reaching shaft of a predetermined depth are excavated on both sides of the road or under the rail. After rectangular pipes are laid in parallel along the cross section of the planned underground structure toward the shaft, ready-made underground structures are followed at the rear end of these pipe groups and propelled from the starting shaft. A method is being used in which the underground structure is replaced with an underground structure while being sent to the reaching shaft side.

(Problems to be Solved by the Invention) However, in order to implement such a method, a reaction wall is required on the starting side to support the reaction force that propels the underground structure, and the conventional method described above requires A starting shaft of a predetermined depth is excavated and the shaft wall is used as a reaction wall, but if an underground structure has to be built in an embankment or in a shallow underground area from the ground surface, the propulsion reaction force The problem is that it is extremely difficult to form a reaction wall that supports the

An object of the present invention is to provide a propulsion reaction force support device for an underground structure that can solve these problems.

(Means for Solving the Problems) In order to achieve the above object, the propulsion reaction force support device for an underground structure of the present invention is designed to improve the underground structure 2 as shown in the drawings corresponding to the embodiment. A plurality of rectangular pipes 5, 5...5 are buried in parallel in advance on the outer periphery of the location so that the edge cutting plates 7 placed on the outer surfaces of the pipes are in contact with the ground 6, and the rear end of this group of rectangular pipes is In the underground structure propulsion reaction force support device for displacing the rectangular pipe 5 and the underground structure 2 while pressing the underground structure 2 with the propulsion jack 13 from the starting side to the destination side, the propulsion jack 13 is supported by a reaction force receiving wall member 9 erected on the starting side, and the reaction force receiving wall member 9 and the rear end of the edge cutting plate 7 are connected. 7 are integrally connected to each other.

(Function) The reaction force receiving wall member 9 is connected to the edge cutting plate 7 of the rectangular pipe 5 buried in the ground 6, and the tip sides of the edge cutting plate 7 are integrally connected to each other and supported by the ground 6. Therefore, when the propulsion jack 13 is operated during propulsion of the underground structure 2, the reaction force necessary for propulsion of the underground structure 2 acts on the reaction force receiving wall member 9, but the acting force is It is received by the ground 6 via the plate 7,
The underground structure 2 will be propelled along the edge cutting plate 7.

(Embodiment) To explain an embodiment of the present invention with reference to the drawings, when constructing an underground structure 2 below a rail 1 across the rail 1, first, one side of the rail 1 is set as the starting side 3 and the other side is A rectangular pipe 5 having a square cross section is horizontally press-fitted toward the reaching side 4.

The outer surface of the rectangular pipe 5 in contact with the ground 6 has a fifth
As shown in the figure and FIG. 6, an edge cutting plate 7 made of a band-shaped steel plate having substantially the same planar shape as this square pipe 5 is mounted, and only the tip of this edge cutting plate 7 is attached to the tip of the square pipe 5. It is fixed by welding 20 or the like.

The square pipe 5 is press-fitted into the ground 6 by inserting an auger (not shown) into the ground 6 and excavating the ground 6, and one square pipe 5 is buried between the starting side 3 and the reaching side 4. Then, on the engaging protrusions 5a and 5b provided on both sides of this square pipe 5,
The next rectangular pipe 5 to be press-fitted is buried while being engaged with the engaging protrusion 5a or 5b protruding from the opposite side surface, and this operation is repeated to form a plurality of rectangular pipes as shown in FIGS. 3 and 4. The pipes 5, 5, . . . 5 form a group of rectangular pipes arranged in a gate shape over the top and both sides of the planned underground passage.

After the square pipe group is buried in the ground 6 between the starting side 3 and the destination side 4 in this way, the reaction force receiving wall member 9 is erected on the foundation material 8 fixed to the ground surface of the starting side 3. This reaction force receiving wall member 9 may be fixed to the base material 8 or may be attached movably in the press-fitting direction.

Furthermore, as shown in FIG. 3, along the outer periphery of the rectangular pipe group protruding toward the starting side 3, a connecting frame 10 is disposed continuously in the shape of a front gate made of H-beam steel or the like. The rear ends of the edge cutting plates 7 of each square pipe 5 are fixed together by appropriate means such as welding, and the connecting frame 10 and the reaction force receiving wall member 9 are connected with a connecting member 11 such as an anchor. . On the other hand, reaching side 4
After cutting off the welds 20 at the tips of the edge cutting plates 7 from the tips of all the square pipes 5 protruding from the edge to release the fixation of the edge cutting plates 7 to the square pipes 5, as shown in FIG. A gate-shaped anchoring frame 12 made of reinforced concrete or steel is erected along the outer periphery of the anchoring frame 12 and is closely attached to and supported by the end surface of the ground where the planned underground structure is to be buried.
The tips of the parts are fixed together by welding, etc.

Further, a plurality of propulsion jacks 13 are attached to the reaction force receiving surface of the reaction force receiving wall member 9, and the propulsion jacks 1
3 and the rear end face of the underground structure 2 to be buried
4 should be interposed.

Further, an intermediate jack frame 15 (see FIG. 7) having approximately the same cross-sectional dimensions as the underground structure 2 is interposed between the tip surface of the underground structure 2 and the rear end of the rectangular pipe group, and the outer circumferential surface of the frame 15 is The edge cutting plate 7 of each rectangular pipe 5 is movable while being brought into sliding contact with the frame 15, and an intermediate jack 16 corresponding to the rear end of each rectangular pipe 5 is disposed within the intermediate jack frame 15.

Note that the intermediate jacks 16 may be directly connected between each rectangular pipe 5 and the underground structure 2 without disposing such an intermediate jack frame 15.

With this configuration, the intermediate jack frame 15
By sequentially operating the inner jacks 16 to push each rectangular pipe 5 a certain distance, the tips of these rectangular pipes 5 protrude toward the reaching side 4.

After all the rectangular pipes 5 are pushed forward a certain length, if the propulsion jack 13 is activated on the starting side 3, the underground structure 2 is press-fitted into the ground 6 via the push frame 14, and while the jack 16 is contracted, the propulsion jack 13 is operated. The jack frame 15 also moves forward. When the propulsion jack 13 is extended and the underground structure 2 is press-fitted by a certain length, the propulsion jack 13 is contracted, and the next press frame 14 is interposed as if to add it, and the underground structure 2 is press-fitted again. .

In this way, if the underground structure 2 is propelled by the pressure of the propulsion jack 13, it will be received by the reaction force receiving wall member 9, and the reaction force receiving wall member 9 will move rearward due to the acting force. However, this reaction force receiving wall member 9 is connected to the rear end of the edge cutting plate 7 of each square pipe 5 via a connecting member 11, and furthermore, the front end of the edge cutting plate 7 is connected to the rear end of the edge cutting plate 7 on the reaching side 4. Since it is connected to the anchoring frame 12 that is pressed against the end surface of the ground 6, the reaction force receiving wall is The member 9 reliably receives the reaction force while standing at a certain position.

The group of rectangular pipes protrudes to the destination side 4 by a certain length by the pressure of the intermediate jack 16, but the protruding portion is removed as appropriate.

Further, the underground structure 2 is press-fitted into the ground 6 while its outer peripheral surface is in sliding contact with the inner surface of the edge cutting plate 7 and guided, and the earth and sand in the underground structure 2 is moved to the starting side 3 by appropriate means. excavated and eliminated.

In this way, when the press-fitting of one underground structure 2 is completed by extruding the rectangular pipe group and press-fitting the subsequent underground structure 2 into the rectangular pipe group, the next underground structure 2 is added and press-fitted in the same manner as above. This operation is then repeated to replace the square pipe group with the underground structure, and an underground passage consisting of a series of underground structures is constructed between the departure side 3 and the arrival side 4.

FIG. 8 shows another embodiment of the present invention, in which edge cutting plates 17 are fixed only to the tips of the square pipes 5 on the inner surface of each square pipe 5, as shown in FIGS. 9 and 10. Square pipes 5 are also arranged in parallel at the bottom of the planned underground structure.

In this case, the rear end of the outer edge cutting plate 7 is connected to the reaction force receiving wall member 9 via the connecting frame 10 and the connecting member 11, as in the above embodiment, and the front end is connected to the fixing frame 12. However, the inner edge cutting board 1
7 has its rear end connected to the reaction force receiving wall member 9 by a connecting member via another connecting frame (not shown) arranged on the inner circumferential side of the underground structure 2, and each edge cutting plate 17 After the front end is released from the square pipe 5, it is connected to another fixing frame 18 arranged on the inner circumferential side of the square pipe group.

Furthermore, the thickness between the inner and outer surfaces of the rectangular pipe 5 is made thicker than the wall thickness of the underground structure 2, and when the underground structure 2 is press-fitted into the ground in the same manner as in the previous embodiment,
Edge cutting plates 7 are provided on the outer and inner circumferential surfaces of this underground structure 2,
17 is buried therein.

With this configuration, the frictional force and bearing pressure resistance force with the ground are increased through the inner and outer edge cutting plates 7, 17, and the reaction force support device can take a large reaction force.

In the above embodiment, each rectangular pipe 5 is pushed forward by the intermediate jack 16. It is also possible to directly connect the objects 2 and push them forward by the propelling jack 13.

(Effects of the Invention) As described above, according to the propulsion reaction force support device for an underground structure of the present invention, the starting side is In an underground structure propulsion reaction force support device for replacing a group of rectangular pipes and an underground structure while pressing the underground structure with a propulsion jack toward the destination side, the propulsion jack is erected on the starting side. The reaction force receiving wall member is supported by a reaction force receiving wall member, and the rear end of the edge cutting plate is connected to the rear end of the edge cutting plate, and the front ends of the edge cutting plates are integrally connected to each other on the reaching side. Therefore, even when the shaft wall cannot be used as a reaction wall, such as when an underground structure must be constructed in an embankment or shallow underground, it is possible to reduce the propulsion reaction force of the underground structure on a large scale. The underground structure can be reliably supported by the reaction force receiving wall member via the edge cutting plate buried in the ground without using any auxiliary means, and the underground structure can be smoothly propelled and buried.

[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 an enlarged cross-sectional view of the intermediate jack frame portion, and Fig. 3 is a simplified side view of the underground structure being press-fitted. FIG. 4 is a front view of the arrival side, FIG. 5 is a vertical cross-sectional side view of a part of the rectangular pipe, FIG. 6 is a vertical cross-sectional front view thereof, and FIG. 7 is a perspective view of the intermediate jack frame. FIG. 8 is a front view showing another embodiment of the present invention, FIG. 9 is a vertical side view showing another form of a rectangular pipe, and FIG. 10 is a vertical front view thereof. 2... Underground structure, 3... Starting side, 4... Arrival side, 5... Square pipe, 6... Ground, 7... Edge cut plate, 9... Reaction force receiving wall member, 10... Connecting frame, 1
1... Connecting material, 12... Fixing frame, 13... Propulsion jack.

Claims (1)

[Scope of Claims] 1. A plurality of rectangular pipes are buried in advance in parallel on the outer periphery of a planned burial position of an underground structure with the edge cutting plates placed on the outer surface of the pipes in contact with the ground. In the underground structure propulsion reaction force support device for replacing a rectangular pipe and an underground structure while pushing the underground structure with a propulsion jack from the starting side toward the destination side following the rear end of the pipe group, the above-mentioned The propulsion jack is supported by a reaction force receiving wall member erected on the starting side, and the reaction force receiving wall member and the rear end of the edge cutting plate are connected, and further, the front end of each edge cutting plate is connected on the reaching side. A propulsion reaction force support device for an underground structure, characterized in that the following are integrally connected to each other. 2. The underground structure according to claim 1, wherein the edge cutting plates are connected on the reaching side by fixing the tip of each edge cutting plate to a fixing frame that is received in the ground on the reaching side. Propulsion reaction force support device. 3. A patent characterized in that the thickness of the rectangular pipe is greater than the wall thickness of the underground structure, and an edge plate located on the inner peripheral surface side of the underground structure is disposed on the inner surface of the rectangular pipe. A propulsion reaction force support device for an underground structure according to claim 1 or 2.