JP2684352B2 - How to build underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground structure of a ready-made underground structure under a road or rail so as to cross the road or rail.

[0002]

2. Description of the Related Art Conventionally, as a method of constructing an underpass or a waterway that crosses a road or under a rail, excavating a starting shaft and a reaching shaft of appropriate depth on both sides of the road or under the rail, As shown in FIG. 10, a rectangular pipe b is formed by mounting an elongated plate c over the entire length on one surface in contact with the ground a, and fixing the tip end of the elongated plate c integrally to the tip end portion thereof. After using this rectangular pipe b in a parallel state from the starting shaft to the reaching shaft along the outer peripheral cross section of the planned underground structure d, the ready-made underground structure is constructed with these parallel pipes. The underground structure is buried in the ground by connecting it to the rear end and propelling it from the starting shaft, advancing the pipe roof with the elongated plate c left underground and excavating the earth and sand in the underground structure. Is being done.

In such an underground structure burying method,
There are two methods to press the underground structure into the ground: pressing the underground structure with a propulsion jack and pulling it from the landing side of the underground structure. Determined by resistance. Contact resistance between elongated plate and square pipe, contact resistance between inner surface of pipe roof and ground, contact resistance between bottom surface of underground structure and ground, contact resistance between elongated plate and underground structure, underground structure If a blade tip is provided at the tip of the object, the cutting resistance by that blade tip. Therefore, the reaction force wall for supporting the reaction force generated by pressing or pulling requires a proof stress equal to or more than the sum of the above-mentioned resistance forces, and such contact resistance force is further increased as the underground structure becomes larger. The larger the soil is, the larger the soil.

[0004]

Therefore, according to the conventional underground structure burying method described above, since the resistance force is increased in total, the structure of the reaction wall becomes large and a large-scale auxiliary construction method is required. It has to be adopted, resulting in a long construction period as well as a great construction cost, and
There was a problem that it took much time and labor to remove the reaction wall after burying the underground structure. The present invention provides a method for constructing an underground structure aiming at solving such problems.

[0005]

In order to achieve the above object, in the method of constructing an underground structure according to the present invention, an edge cutting plate also serving as a traction member is fixed only to the tip of the edge cutting plate on the surface in contact with the ground. A plurality of hollow rectangular pipes placed in a state are buried in parallel from the start side to the arrival side at least on the side wall and upper floor position of the planned underground structure to form a group of rectangular pipes arranged in a gate shape. Then, on the starting side, the ready-made underground structures were brought into contact with the rear ends of these hollow rectangular pipe rows via the first jack, and the rear ends of all edge plates were erected at the rear of the ready-made underground structures. Insert the movable reaction force receiving wall member and connect its end to the towing jack, and at the arrival side, fix the tip of each edge cutting plate from the hollow rectangular pipe to support it on the arrival side ground, and then cut the edge. No. 1 above, leaving the plate
The hollow rectangular pipes are sequentially pushed and moved forward by the jacks, and then the first jacks are contracted, and the traction jacks are used in accordance with the contraction amount, and the reaction force is supported by the reaction force receiving wall member. By moving the plate, the ready-made underground structure is advanced together with the movable reaction force receiving wall member, and the pressing of the first jack and the advance of the ready-made underground structure are repeated to replace the ready-made underground structure with the pipe. It is characterized by doing.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Since an edge cutting plate placed on a surface of a pipe having a rectangular cross section which is in contact with the ground has its tip fixed to the tip of the pipe, the edge cutting plate is referred to as a pipe. It can be press-fitted integrally into the ground, and after multiple pipes are press-fitted in parallel to at least the side wall and upper floor of the planned underground structure, the end of the edge plate is unfixed from the hollow rectangular pipe. When the first jack is extended while being supported by the side ground, and the prefabricated underground structure is in contact with the rear end of the hollow rectangular pipe array through the first jack, the prefabricated underground structure serves as a reaction force receiver. The row of hollow rectangular pipes smoothly advances while slidingly contacting the lower surface of the edging plate. After advancing for a certain length, the first jack is contracted.

On the other hand, the rear ends of all the edge cutting plates are inserted through a movable reaction force receiving wall member which is erected on the starting side at the rear of the ready-made underground structure, and the ends thereof are connected to the tow jack. When the edge cutting plate is pulled by this towing jack according to the contraction amount of the first jack with the reaction force receiving wall member supporting the reaction force, the edge cutting plate causes the tip of the edge cutting plate to be supported by the ground on the arrival side. Therefore, the movable reaction force receiving wall member relatively moves forward by the towing of the towing jack to advance the ready-made underground structure. After advancing a ready-made underground structure of a certain length, the first jack is extended again to advance the hollow rectangular pipe row, then the first jack is contracted, and the towing jack is operated according to the contraction amount. By this, the ready-made underground structure is advanced, and this is repeated to replace the hollow rectangular pipe array with the ready-made underground structure. Further, the above-mentioned ready-made underground structure is composed of a plurality of divided ready-made underground structures, a second jack is interposed between each of the divided ready-made underground structures, and the jacks on the pipe side are sequentially operated so that the ready-made underground structure is divided. If the object is pushed and moved forward, the propulsion and burying work of the ready-made underground structure can be performed more easily and accurately.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
When constructing a ready-made underground structure 2 across the rail 1 under the rail 1, first, one side of the rail 1 is a starting side 3 and a hollow rectangular pipe having a quadrangular cross section toward the arrival side 4 on the other side. 5
Press in horizontally. On the outer surface of the hollow rectangular pipe 5 which is in contact with the ground 6, as shown in FIGS. 2 and 3, an edge cutting plate 7 made of a strip steel plate having substantially the same plane as the hollow rectangular pipe 5 is placed. Only the tip of the edge cutting plate 7 is fixed to the tip of the hollow rectangular pipe by welding 20 or the like.

The hollow rectangular pipe 5 is press-fitted into the ground 6 by inserting an auger (not shown) therein.
When one hollow rectangular pipe 5 is buried between the starting side 3 and the reaching side 4 while excavating, the engaging projections 5a, 5b provided on both side surfaces of the hollow rectangular pipe 5 are Engaging ridges protruding from opposite side surfaces of the next hollow rectangular pipe to be press-fitted
It is buried while engaging 5a or 5b, and this work is repeated, and as shown in FIGS. 4 and 5, a plurality of hollow rectangular pipes 5 are arranged in parallel in a gate shape over the upper floor position and both sides of the planned underground structure. Forming a group of hollow rectangular pipes. In this way, the hollow rectangular pipes are connected to the ground 6 between the starting side 3 and the reaching side 4.
After being embedded inside, the reaction force receiving wall member 9 is erected on the base material 8 fixed to the ground surface of the starting side 3 so as to be movable forward.

Further, as shown in FIG. 4, a continuous front frame-shaped connecting frame 10 made of H-shaped steel or the like is arranged along the outer periphery of the hollow rectangular pipe group protruding toward the starting side 3, and this connecting frame is formed.
The rear end of the edge cutting plate 7 of each hollow rectangular pipe 5 is integrally fixed to 10 by an appropriate means such as welding, and the connecting frame 10 and the reaction force receiving wall member 9 are connected by a connecting member 11 such as an anchor. To do.

On the other hand, after the welding 20 at the tip of the edging plate 7 is separated from the tips of all the hollow rectangular pipes 5 projecting to the arrival side 4, the fixation of the hollow rectangular pipe 5 to the edging plate 7 is released, and then FIG. As shown in FIG. 5, a gate-shaped anchoring frame 12 made of reinforced concrete or steel, which is erected along the outer periphery of the edging plate 7, is closely adhered to and supported by the end face of the planned underground structure buried ground, and the anchoring frame is also supported. The tip of each edging plate 7 is integrally fixed to 12 by welding or the like.

A plurality of propulsion jacks 13 are attached to the reaction force receiving surface of the reaction force receiving wall member 9, and a pushing frame 14 is provided between the propulsion jacks 13 and the rear end surface of the prefabricated underground structure 2 to be buried. Make it intervene. Further, a jack frame 15 (see FIG. 6) having substantially the same cross-sectional outer size as the underground structure 2 is interposed between the front end surface of the ready-made underground structure 2 and the rear end of the hollow rectangular pipe group, and the outer peripheral surface side of the frame 15 The jack frame 15 is configured to be movable while slidingly contacting the edge cutting plate 7 of each hollow rectangular pipe 5.
A first jack 16 is provided inside the hollow rectangular pipe 5 corresponding to the rear end thereof.

The first jack 16 may be directly connected between each hollow rectangular pipe 5 and the prefabricated underground structure 2 without disposing such a jack frame 15. The ready-made underground structure 2 is a divided ready-made underground structure formed in a shape obtained by dividing the planned underground structure into a plurality of parts.

With this construction, when the jacks 16 in the jack frame 15 are sequentially actuated and extended, the hollow rectangular pipe 5 slides in contact with the edge cutting plate 7 using the edge cutting plate 7 as a guide. The tip portion projects to the arrival side 4. After pushing all hollow rectangular pipes 5 to a certain length, if the propulsion jack 13 is operated on the starting side 3, the ready-made underground structure 2
Is press-fitted into the ground 6 through the push frame 14, and the jack frame 15 is advanced while the jack 16 is contracted. 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 push frame 14 is additionally provided to intervene to press-fit the underground structure 2 again. .

Thus, when the underground structure 2 is moved forward by pressing the propulsion jack 13, the reaction force is received by the reaction force receiving wall member 9 and the reaction force thereof is applied to the reaction force receiving wall member. 9
Tries to move rearward, but the reaction force receiving wall member 9 is connected to the rear end of the edge cutting plate 7 of each hollow rectangular pipe 5 via a connecting member 11, and further, Since the front end is connected to the fixing frame 12 that is pressed against the end surface of the ground 6 on the arrival side 4, it is counteracted by the frictional force between the outer surface of the edge cutting plate 7 and the ground 6 and the pressure of the ground 6 against the fixing frame 12. Force receiving wall member 9
Securely receives the reaction force while standing upright at a certain position.

The hollow rectangular pipe group is projected to the arrival side 4 for a certain length by the pressing of the intermediate jack 16, but the projecting portion is appropriately removed. The underground structure 2 is pressed into the ground 6 while the outer peripheral surface of the underground structure 2 is slidably contacted with the inner surface of the edging plate 7 and guided, and the earth and sand in the underground structure 2 is excavated to the starting side 3 by an appropriate means. Will be eliminated.

Thus, when the hollow rectangular pipe group is extruded and the underground structure 2 following the hollow rectangular pipe group is press-fitted to complete the press-fitting of one ready-made underground structure 2, as shown in FIG. Then, the next ready-made underground structure 2 is connected to the rear end surface of the ready-made underground structure 2 through a plurality of second jacks 17, and the rear end of the ready-made underground structure 2 is pushed by the pushing frame 14 at the starting side 3. To accept.

In this state, the first jack 16 in the jack frame 15 is sequentially extended to project the hollow rectangular pipe 5 toward the arrival side 4 using the edge cutting plate 7 as a guide in the same manner as described above. After pushing for a certain length, the second jack 17 is extended all at once, and the succeeding ready-made underground structure 2
The first ready-made underground structure 2 already press-fitted in a state where the reaction force is received on the side toward the arrival side 4 is the first jack.
Advance by the advance length of the hollow rectangular pipe group by 16.
Then, the propulsion jack 13 is operated on the starting side 3 to contract the second jack 17 while the succeeding prefabricated underground structure 2 is preceded via the pushing frame 14
It is press-fitted into the ground 6 for the forward length of.

As described above, the first jack 16 pushes forward the hollow rectangular pipe group, the second jack 17 advances the prefabricated underground structure 2, and the propulsion jack 13 press-fits the prefabricated underground structure 2. The prefabricated underground structure 2 is press-fitted into the ground by repeating the above procedure, and when the press-fitting of the prefabricated underground structure 2 is completed, the prefabricated underground structure 2 is again pressed.
To the next ready-made underground structure 2 via the second jack 17, and in the same manner as described above, the jacks on the arrival side 4 are sequentially operated toward the start-side jack to press the ready-made underground structure 2 to move forward. Let

By repeating this work, the ready-made underground structure 2 at the forefront reaches the arrival side 4, and when the hollow rectangular pipe group and the underground structure are replaced, the adjacent ready-made underground structure 2,
The second jack 17 interposed between the two is removed in order from the arrival side 4, and the ready-made underground structure 2, which is separated by this removal,
The jack 17 on the trailing side is operated between the two to bring the front end surface of the ready-made underground structure 2 on the front side into contact with the rear end surface of the ready-made underground structure 2 on the front side. This work is repeated up to the last ready-made underground structure to build an underground passage consisting of a series of underground structures between the starting side 3 and the reaching side 4.

As shown in FIG. 7, the second jack 17 interposed between each of the ready-made underground structures 2 and 2 has a front end of an intermediate box 18 having the same shape as the outer peripheral end surface of the ready-made underground structure 2. A plurality of rectangular frames 18a are attached with their front ends in contact with each other.
The rear ends of the plurality of jacks 17 may be brought into contact with the front end of the prefabricated underground structure 2 on the trailing side by interposing therebetween, and the prefabricated underground structure 2 may be pressed and advanced by the operation of the jacks 17. .

In this case, the pressing force of the plurality of jacks 17 acts as a uniform pressing force on the entire rear end of the preceding prefabricated underground structure 2 via the front end rectangular frame 18a of the intermediate box 18, and the accurate pressing is performed. And the number of jacks 17 used can be reduced. In addition, without performing the work of joining the ready-made underground structures 2 and 2 after removing the jack 17,
This intermediate box 18 can be used as a part of the ready-made underground structure 2.

In the above embodiment, the propulsion jack 13 is arranged on the starting side 3 to press the ready-made underground structure 2 by pressing, but a press-fitting method by towing may be adopted. That is, FIG. 8 shows the traction press-fitting method,
In the same manner as in the above-mentioned embodiment, the edge cutting plate 7 is mounted on the entire surface of the planned underpass between the starting side 3 and the reaching side 4 under the track, with the tip of the edge cutting plate 7 fixed to the surface in contact with the ground. After a plurality of hollow rectangular pipes 5 that are placed are press-fitted in parallel and embedded, a reaction wall 19 is attached to the ground end face of the reaching side 4 so that the outer peripheral end face of the hollow rectangular pipe group contacts the inner peripheral face of the hollow rectangular pipe group. Arrange.

Furthermore, on the ground between the starting side 3 and the reaching side 4,
The rear end face of the ready-made underground structure 2 into which the sheath tube 22 through which the wire rope 21 is inserted is embedded in parallel using an appropriate punching device, and the rear end portion of the wire rope 21 protruding on the starting side 3 should be press-fitted. While being inserted and fixed to the support plate 23 that is in contact with the center, the front end portion of the wire rope 21 projecting to the arrival side 4 is provided in the front surface of the reaction wall 19 through the hole formed in the reaction wall 19. Insert it freely into the jack 24. In this state, if the first and second jacks 16 and 17 are sequentially extended, the reaction force is supported by the reaction force wall 19 from the support plate 23 via the wire rope 21 and is rectangular as in the above embodiment. The pipe 5 and the ready-made underground structure 2 can be sequentially pressed and moved forward.

When the advance of the prefabricated underground structure 2 by a fixed length is completed, the wire rope 21 is moved by the center hole jack 24.
To advance the rearmost ready-made underground structure 2.
In addition, every time such a predetermined length of forward movement is performed, the ground 6 is excavated and removed from the frontmost prefabricated underground structure 2, and the sheath tube 22 is cut to an appropriate length while leaving the wire rope 21. By repeating this work in sequence, an underpass consisting of a series of underground structures is constructed between the starting side 3 and the reaching side 4.

Incidentally, such a pulling means can be adopted in the above-mentioned embodiment, and in this case, this wire rope 21
Instead of pulling, the edge cutting plate 7 is used as a pulling member, and the connecting member 11 connected to the rear end connecting frame 10 of the edge cutting plate 7 is inserted through the reaction force receiving wall member 9 and the reaction force receiving wall member 9 is inserted. It may be inserted in a center hole jack provided on the back surface of the stop wall member 9 so as to be freely drawn out.

The removal of the second jack 17 after the completion of the burial of the ready-made underground structure 2 is the same as in the above-mentioned embodiment, but the cutting edge 25 is integrally formed on the front end surface of the ready-made underground structure 2 at the forefront. If it is provided so as to project, the ready-made underground structure 2 can be easily advanced, and the ground 6 can be simultaneously advanced while excavating.

[0028]

As described above, according to the method for constructing an underground structure of the present invention, an edge cutting plate also serving as a traction member is entirely mounted on the surface in contact with the ground with only its tip fixed. A plurality of hollow rectangular pipes placed in parallel with each other are embedded in at least the side wall and the upper floor of the planned underground structure from the starting side toward the reaching side to form a group of rectangular pipes arranged in a gate shape.
On the starting side, the first of the hollow rectangular pipe rows at the rear end
The ready-made underground structure is abutted via the jack of and the movable reaction force receiving wall member standing upright at the rear of all the edge cutting plates is inserted through the rear end of the edge-cutting plate and the end is pulled. After unfastening the tip of each edge cutting plate from the hollow rectangular pipe on the arrival side to support it on the ground on the arrival side, the first rectangular jack sequentially presses the hollow rectangular pipes while leaving the edge cutting plate. , Forwardly, and then contracts each first jack, and pulls the edge cutting plate in a state in which the reaction force receiving wall member supports the reaction force by the pulling jack in accordance with the amount of contraction, and thereby the movable counter plate is moved. It is characterized in that the ready-made underground structure is advanced together with the force receiving wall member, and the pressing of the first jack and the advance of the ready-made underground structure are repeated to replace the ready-made underground structure with a pipe. From the pressing of the first jack The hollow rectangular pipe that advances further moves forward while making sliding contact with the lower surface of the edge plate that remains in the ground without contacting the ground, so the resistance force is much smaller than when it contacts the ground, and ready-made underground structures also Since the edge cutting plate of No. 2 is used as a guide, the contact resistance between the two is significantly reduced, and it is possible to easily build an already-fabricated underground structure while promoting it even on viscous ground.

Further, the movable reaction force receiving wall member erected upright behind the ready-made underground structure is inserted through the rear ends of all edge cutting plates whose front ends are supported by the ground on the arrival side on the starting side. Since the end portion is connected to the towing jack and the reaction force is supported by the reaction force receiving wall member, the edge cutting plate is pulled by the towing jack according to the contraction amount of the first jack. By using this edge cutting plate as a towing member, the operation of the towing jack can smoothly advance the ready-made underground structure through the movable reaction force receiving wall member, thus reducing the structure of the reaction force receiving on a small scale. It is possible to form the structure without the need for an auxiliary construction method, and by receiving such a small reaction force, it is possible to smoothly bury even an underground structure having a large cross section or an underground structure having a large length.

Further, the above-mentioned prefabricated underground structure is composed of a plurality of divided prefabricated underground structures.
By inserting the jack of the above, and pressing the hollow underground pipe side sequentially to push and advance the divided underground structure, it is easy to promote the prefabricated underground structure and bury it by a smaller means. It can be done accurately and accurately.

[Brief description of the drawings]

FIG. 1 is a simplified side view of a partially longitudinal section of an underground structure press-fitted.

FIG. 2 is a vertical sectional side view of a part of a hollow rectangular pipe,

FIG. 3 is a vertical sectional front view thereof,

FIG. 4 is a rear view seen from the starting side,

FIG. 5 is a front view seen from the arrival side,

FIG. 6 is a perspective view of a jack frame,

FIG. 7 is a perspective view of an intermediate box,

FIG. 8 is a simplified vertical sectional side view showing a state in which a ready-made underground structure is press-fitted by traction,

FIG. 9 is a front view thereof,

FIG. 10 is a simplified vertical sectional front view for explaining a conventional method.

[Explanation of symbols]

 2 Ready-made underground structure 3 Start side 4 Arrival side 5 Hollow rectangular pipe 7 Edge cutting plate 9 Movable reaction force receiving wall member 16 First jack 24 Center hole jack

Claims (1)

(57) [Claims] 1. A hollow rectangular pipe in which an edge cutting plate also serving as a traction member is entirely mounted on a surface in contact with the ground with only its tip fixed, is planned from the starting side to the reaching side. A plurality of rectangular pipes are embedded in parallel in at least the side wall and upper floor position of the underground structure to form a gate-shaped parallel pipe,
On the starting side, the first of the hollow rectangular pipe rows at the rear end
The ready-made underground structure is abutted via the jack of and the movable reaction force receiving wall member standing upright at the rear of all the edge cutting plates is inserted through the rear end of the edge-cutting plate and the end is pulled. After unfastening the tip of each edge cutting plate from the hollow rectangular pipe on the arrival side to support it on the ground on the arrival side, the first rectangular jack sequentially presses the hollow rectangular pipes while leaving the edge cutting plate. , Forwardly, and then contracts each first jack, and pulls the edge cutting plate in a state in which the reaction force receiving wall member supports the reaction force by the pulling jack in accordance with the amount of contraction, and thereby the movable counter plate is moved. An underground structure characterized by advancing an existing underground structure together with a force receiving wall member, and repeating the pressing of the first jack and the advance of the existing underground structure to replace the underground structure with a pipe. How to build.