JP2007247285A - Underground structure using wide lining element, and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground structure using a wide lining element, and its construction method. <P>SOLUTION: In this underground structure in which the lining element is horizontally arranged between standard pipes 2, one sheet of the wide lining element 3 thinner than the outer shape of the standard pipe 2 is jacked and installed between the standard pipes 2 which are provided at an interval at corners. The construction method for the underground structure in which the lining element is arranged between the standard pipes is characterized in that one sheet of the wide lining element 3 thinner than the outer shape of the standard pipe is installed in such a manner as to be jacked between the standard pipes which are provided at the interval at the corners. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an underground structure using a wide lining element used when building an underground structure such as a tunnel, a human road, and a dark shade, and a construction method thereof.

  Conventionally, as a method for constructing underground structures such as tunnels, human roads, and dark walls, a PCR method (prestressed concrete roof) in which a large number of narrow prestressed concrete members are arranged on the ceiling, side walls, or floor. Construction method) is known (for example, see Patent Documents 1 to 4).

  In the case of the conventional construction method, for example, as shown in FIG. 12, it has a cutter 8 for excavation at the tip portion and an auger 9 at the rear portion thereof, and has a constant size of a regular square with a built-in excavator. Are provided in front of the direction of excavation, and steel tip conduits 11 are sequentially connected in series to the rear thereof, and are made of a narrow-width precast so as to substantially match the size of the outer shape of the steel tip conduit 11. As shown in FIGS. 9 and 10, the lining element 3a made of a prestressed concrete member is connected, the propulsion device 12 is engaged with the rear portion of the lining element 3a, and the lining element 3a is propelled. Underground structure 1 was constructed.

  Further, in the above-mentioned case, a guide member such as a pair of angle members is provided on the side portion of the steel leading conduit 11, so that the lining element 3a is engaged with the guide member as shown in FIG. As described above, the lining element 3a is provided with a guide member 7 such as a pair of angle members continuously spaced in the vertical direction and continuously in the longitudinal direction of the member. I try to secure it.

In addition, a steel reference pipe 2 having a rectangular cross section is embedded in the corner portion of the underground structure 1, and a large number of precast lining elements 3 a are interposed between the reference pipes 2 in the horizontal direction or the vertical direction. They are arranged side by side and embedded.
Japanese Patent No. 1265325 Japanese Patent No. 1770220 Japanese Patent No. 1617697 Japanese Patent No. 2512374

  In the case of the conventional method, since a large number of narrow lining elements 3a are promoted to construct the underground structure 1, there are many lining elements 3a. Thus, a lot of joints 6 are generated, and a lot of joints 6 are washed and filled with a filler 4 such as mortar.

  Moreover, in the steel tip conduit 11 having a square steel pipe main body arranged in advance of the lining element 3a, two guide members such as angle members are provided on both sides of the steel tip conduit 11 at intervals in the vertical direction. Since the space | interval of the covering element 3a engaged with this is ensured, since the guide member 7, such as a pair of angle materials, is provided also in the covering element 3a as mentioned above, this is promoted. In the state of being embedded in the ground, as shown in FIG. 10, one joint portion 6 includes three guide member upper joint portions 6 a, guide portion joint joint portions 6 b, and guide member lower joint portions 6 c in the vertical direction. In order to be in a state of being divided into places, the curable filler 4 such as washing of the joint portions 6a to 6c divided in the vertical direction at each of the three places, and mortar to each of the divided joint portions 6a to 6c is provided. Do not perform the very complicated work of filling I had to Re.

Further, since the lining element 3a is propelled in the axial direction of the tunnel, the laterally tightened PC steel material 5 is tension-fixed and integrated in the direction perpendicular to the axis. For this reason, the necessary stress is not introduced unless the joints 6 are reliably washed and filled with the filling material 4 and have a predetermined strength before the horizontal fastening. .
An object of this invention is to provide the underground structure using the wide lining element which can eliminate the said subject advantageously, and its construction method.

In order to solve the above-mentioned problem advantageously, in the underground structure of the first invention, in the underground structure in which the covering element is disposed between the reference pipes, the reference pipes provided at the corners at intervals are provided. In the meantime, one wide lining element thinner than the outer dimension of the reference pipe is propelled and installed.
The second invention is characterized in that in the underground structure of the first invention, a filler is filled between a reference pipe and the wide lining element.
Further, in the third invention, in the underground structure of the first invention or the second invention, the PC steel material is arranged between the wide lining element and the reference pipes on both sides thereof, and the PC steel material. It is characterized in that it is fixed by introducing a tension force, and prestress is introduced into the wide lining element and integrated with each reference pipe.
Moreover, in the construction method of the underground structure of the fourth invention, in the construction method of the underground structure in which the lining elements are arranged between the reference pipes, the reference pipes provided at the corners at intervals are provided. In the meantime, one wide lining element thinner than the outer dimension of the reference pipe is propelled and installed.

According to the first invention, since the lining element is made thin and wide at the same time, the wide lining element is used. As in the case where a large number of narrow lining elements are used between the reference pipes as in the prior art, many Without filling the filler between the narrow lining elements at the location, it is only necessary to fill the filler in two places on both sides of the wide lining element, greatly eliminating the joints. Since there is one wide lining element between the reference pipes, the quality between the reference pipes can be stabilized, the construction period can be shortened to a certain level, and the construction cost can be reduced. be able to.
According to the second aspect of the invention, since the filler is filled between the wide lining element and the reference pipe, the wide lining element and the reference pipe can be integrated, and a water stopping effect is exhibited. be able to.
According to the third invention, the wide lining element and the reference pipes on both sides thereof are integrated by the tension-fixed PC steel material, so that a strong underground structure can be obtained.
According to the fourth invention, between the reference pipes provided at the corners at intervals, the single wide lining element thinner than the outer dimensions of the reference pipe is installed so as to be installed. Since one sheet is sufficient without using many width lining elements, the workability can be greatly improved. In addition, as in the case of using a large number of conventional narrow lining elements, both sides of the wide lining elements can be used without cleaning the joints between the narrow lining elements at many locations and filling with fillers. Since it is only necessary to fill the filler in only two places, the joint portion can be largely eliminated, the joint portion construction efficiency can be greatly improved, the construction period can be shortened, and the construction cost can be reduced. Can be reduced.

    Next, the present invention will be described in detail based on the illustrated embodiment.

  FIG. 6 shows an underground structure 1 according to an embodiment of the present invention. The corners of the four corners of the underground structure 1 are internally square reinforced by reinforcing ribs (not shown). A reference pipe 2 having a steel pipe body is provided, and a precast made of a single sheet, which is thinner than the vertical dimension of the reference pipe 2 in the vertical direction, is provided between adjacent reference pipes 2 at intervals in the ceiling and floor portions. A thin and wide lining element 3 is disposed, and a filling material 4 such as mortar is filled between the reference pipe 2 and the wide lining element 3, and one reference pipe 2, the wide lining element 3 and the other reference. A PC steel material 5 for lateral fastening such as a PC cable is inserted through the tube 2 and the PC steel material 5 is fixed and integrated inside the reference tube 2 in a tensioned state. In addition, when the curable filler 4 such as mortar is filled between the reference pipe 2 and the wide lining element 3, after the PC steel material insertion duct is formed on the joint portion 6 in advance as needed, Filler 4 is filled.

  Similarly, between the reference pipes 2 adjacent to each other at intervals in the side wall portion, a single precast thin and wide lining element 3 which is thinner than the lateral dimension of the reference pipe 2 is vertically arranged. Thus, a filling material 4 such as mortar is filled between the reference tube 2 and the wide lining element 3, and a PC cable or the like is stretched over one reference tube 2, the wide lining element 3 and the other reference tube 2. A PC steel material 5 for vertical fastening is inserted and arranged, and the PC steel material 5 is fixed and integrated inside the reference pipe 2 in a tension state. In the same manner as described above, when the curable filler 4 such as mortar is filled between the reference tube 2 and the wide lining element 3, a duct for inserting a vertical tightening PC steel material is formed in the joint portion 6 in advance.

  Each of the reference pipes 2 includes a pair of guide members extending in the longitudinal direction of the member at a position eccentric to the inner air side of each piece from the inner air side adjacent at right angles in the underground structure 1. 7, a filler 4 such as mortar is appropriately filled between the inner surface-covered reference tube 2 and the wide-width lining element 3, and the reference tube is internally coated and covered.

  Next, a method for constructing the underground structure 1 as described above will be described.

  In the case of the present invention, there are the same parts as in the conventional case. First, as shown in FIGS. 1 (a) and 1 (e), a cutting cutter 8 is provided at the front end and an auger 9 is provided at the rear thereof. The point that the excavation tip pipe 10 which is square and has a narrow and constant size excavation device is provided in the front of the excavation traveling direction, and the steel tip conduit 11 is sequentially connected in series to the rear portion is the same. .

  Then, as shown in FIG. 2, corners are formed in the underground 13 while being sequentially propelled by the propulsion device 12 having a pressing jack or the like so as to start from the starting side shaft toward the reaching shaft. This is also the same in that the steel reference pipe 2 positioned in the section and the steel tip conduit 11 between them are press-fitted and installed in a rectangular shape along the outline of the underground structure 1. However, the difference is that the pair of guide members 7 provided on the steel reference pipe 2 and the steel tip conduit 11 adjacent thereto are provided at positions displaced toward the inner space of the underground structure 1. ing.

  The reason for providing the pair of guide members 7 in the steel reference pipe 2 and the steel tip conduit 11 adjacent to the steel reference pipe 11 at a position displaced toward the inner space of the underground structure 1 One or a plurality of steel hollows to be replaced after the steel tip conduit 11 is replaced by a replacement member that replaces the steel tip conduit 11 on the inner air side of the underground structure 1. This is because it is constituted by the temporary support member 14 and the thin wide covering element 3 which is located outside the temporary support member 14 and constitutes the main body portion of the underground structure 1.

  The mounting position of the guide member 7 provided in the steel tip conduit 11 located between the steel tip conduits 11 may be provided at a position displaced toward the inner side as described above, or conventionally. Similarly to the above, the steel tip conduit 11 may be provided at a symmetrical position around the central axis.

  The guide member 7 is a female guide member 7 installed so that one side of a pair of angle members faces inward with a gap, and one side of a pair of angle members faces outward with a gap. It is comprised by either of the male type guide members installed so that it may do.

  The temporary support member 14 and the wide lining element 3 are integrated in a state in which the outer peripheral surface of the front end portion and the outer peripheral surface of the rear end portion are temporarily bound and integrated by a band 22 or the like in FIG. As shown in b), the start shaft side is inserted between the upper plate 15 and the lower plate 16 at the rear end of a number of steel leading conduits 11 and is temporarily fixed with bolts or the like so as to be detachable as appropriate. Promoted from. In order to prevent the band 22 from projecting, it is preferable that the temporary support member 14 and the covering element 3 are provided with recesses and the guide member 7 is provided with a band insertion hole.

  In addition, the steel tip conduits 11 adjacent to each other in series from the start shaft to the reach shaft, or between the steel tip conduit 11 and the temporary support member 14, and the temporary support members 14 are shown in FIG. As such, it may be temporarily fixed by welding.

  Temporary fixing of the rear end portion of the steel leading pipe 11 and the front end portion of the wide lining element 3 and temporary binding of the temporary support member 14 and the front end portion and the rear end portion of the wide lining element 3 are the start shaft 17 and After the wide lining element 3 is propelled and arranged following the steel tip conduit 11 over the arrival shaft 18, the temporary binding by the band 22 or the like is released after being positioned in the start shaft 17 and the arrival shaft 18.

The steel temporary support member 14 may be a single steel box-type temporary support member 14 as shown in FIG. 3, or, as shown in FIG. The temporary support member 14 may be connected by a guide member 7 also serving as a joint, and the wide side temporary support member 14 is integrated by firmly connecting the side walls of the temporary support member 14 with bolts or the like. In this way, the underground structure 1 can be easily disassembled and removed after excavation on the inner side.
On both sides of the temporary support member 14, there are provided female or male guide members 7 that are spaced in the vertical direction and extend in the front-rear direction. One side of the pair of steel L-shaped angles is fixed to both side portions of the temporary support member 14 with a gap therebetween to form a female or male guide member 7.

  The wide lining element 3 may be a single precast prestressed concrete plate. As shown in FIG. 7, a plurality of precast concrete plates 3a are arranged in parallel and are inserted through the horizontal holes in the horizontal direction. A PC steel material 5a in the left-right direction that is arranged and tension-fixed, and a PC steel material 5b in the front-rear direction that is inserted through the lateral hole in the front-rear direction and connected by a coupler 19 and is tension-fixed at the end portion. Therefore, it may be integrated in a plate shape. In addition, each precast concrete slab 3a arranged in parallel is previously provided with an insertion hole 5c for inserting the laterally tightened PC steel material 5.

  FIG. 1 (e) shows a temporary support member 14a with a cover element as shown in FIG. 1 (d) in which a temporary support member 14 is temporarily bound to a wide cover element 3 as shown in FIG. As described above, the front end portion of the temporary support member 14a with the lining element is fitted and arranged on the receiving portion 20 at the rear end portion of the steel leading conduit 11, and is attached and detached from the upper and lower outer sides of the receiving portion 20 as necessary. A possible bolt is screwed and fixed to the wide-width lining element 3 or the internal thread portion (not shown) of the temporary bearing member 14 in the support member 14a with the wide-width lining element.

  And as shown in FIG.1 (c), in the state which has arrange | positioned support members, such as a cap for support, in the rear-end part of the support member 14a with a wide lining element, it pushes and propels by the propulsion apparatus 12 by the side of a start shaft. The entire steel tip conduit 11 between the steel reference pipes 2 at the ceiling is replaced with the temporary bearing member 14a with the wide lining element.

Similarly, as shown in FIG. 4, the leading conduit 11 between the steel reference pipes 2 of the side wall portion and the floor slab portion is similarly replaced with a temporary support member 14a with a wide lining element, and each corner portion is made of steel. The joint portion 6 between the reference pipe 2 and the wide lining element 3 is washed with a water jet and vacuumed to discharge the soil, and one of the horizontal reference pipe 2 and the wide lining element in the ceiling portion and the floor board portion. A PC steel material 5 for lateral fastening such as a PC cable is inserted and arranged across the reference pipe 3 and the other reference pipe 2.
In the above case, after propelling the steel tip conduit 11 in the ceiling portion, it is replaced with the temporary support member 14, and after propelling the steel tip conduit 11 in the side wall portion, this is replaced with the temporary support member 14 Then, after propelling the steel tip conduit 11 of the floor slab part, after replacing it with the temporary support member 14, the joint part 6 may be cleaned.

  Next, as shown in FIG. 5, a filler 4 such as mortar is filled between the steel reference pipe 2 at each corner portion of the left and right end portions of the ceiling portion and the floor slab portion and the wide lining element 3.

  In addition, a vertical fastening PC steel material 5 such as a PC cable is inserted and arranged across one reference pipe 2 in the vertical direction, the wide lining element 3 and the other reference pipe 2 in each side wall. Next, a filler 4 such as mortar is filled in the joint portion 6 between the steel reference pipe 2 at each corner portion at the upper and lower end portions of the side wall portion and the wide lining element 3.

  After the filler 4 of each joint portion 6 is cured, the laterally tightened PC steel material 5 and the vertically tightened PC steel material 5 are tension-fixed, and the reference pipe 2 and the wide lining element 3 in the ceiling portion, the floor slab portion, and the side wall portion are fixed. Integration is attempted, and the underground structure housing 21 with temporary support members is constructed.

  Then, the hollow part is formed by excavating the inner part of the underground structure housing 21 with the temporary support member. At this time, a support work for temporarily receiving the temporary support member 14 is appropriately installed as necessary. Further, the mutual engagement between the guide member 7 and the reference tube 2 and the temporary support member 14 is released.

  As a means for releasing the engagement of the guide member 7 between the guide member 7 and the steel reference pipe 2 in the temporary support member 14, the band of the temporary support member 14 on the starting shaft side and the reaching shaft side and the wide lining element 3 is used. When the temporary support member 14 is one wide, the temporary support member 14 is pulled back to the start shaft side, the engagement is released, and the underground structure 1 is constructed. .

  Further, as another means for releasing the engagement of the guide member 7 between the guide member 7 and the steel reference pipe 2 in the temporary support member 14, when the temporary support member 14 is one wide, the temporary support member The guide member 7 of 14 is appropriately melted or the guide member 7 of the steel reference tube 2 is appropriately melted to release the engagement between the temporary support member 14 and the steel reference tube 2 to construct the underground structure 1. .

  Further, when the temporary support member 14 is a unitary combination of a large number of small temporary support member units 14c provided with the guide member 7 as shown in FIG. 8, in a state where the inner ground side is excavated, Since there is play in the engaging portion between the guide members 7 in the adjacent small temporary support member units 14c, one small temporary support member unit 14c in the central portion is pulled from the center of the inner space side using the play gap. The temporary support member 14 is removed and the underground structure 1 is constructed by bending the ceiling part or the entire side wall part to remove it, or pulling it back to the start shaft side.

  The inner surface of the underground structure 1 constructed as described above is appropriately decorated to construct the underground structure 1.

In addition, if the whole general construction procedure including the construction procedure described above is abbreviated, the following steps are performed.
(1) A start shaft (or vertical hole or recess) and a reaching shaft (or vertical hole or recess) are formed, and a propulsion frame is provided on the start shaft side.
(2) At the start shaft side, an excavator is attached in front of the square reference pipe at the corner corner portion serving as a reference.
(3) The excavator is started and the square reference pipe 2 is propelled toward the reaching shaft by the propulsion device.
(4) If there are no underground obstacles in front of the excavator, propel it to the opposite shaft. If there is a ground fault, pull out only the excavator backward and remove the obstacle manually (note that this work space requires a square reference tube having a space of 850 mm × 850 mm in cross section).
(5) After the preceding reference pipe 2 is propelled, the preceding destination pipe is propelled all between the reference pipes 2.
(6) A temporary support member 14 for supporting the wide lining element is disposed or appropriately assembled on the rear frame, and one wide lining element 3 is placed on the temporary support member 14 or Assembled and arranged. When the wide lining element 3 is divided into a plurality of parts for transportation, the necessary number of PC steel materials (5a, 5b) for joining are tensioned and joined. Tensioned in both the axial direction and the direction perpendicular to the axis. Further, when the temporary support member 14 is divided into a plurality of parts in the axial direction for transportation, the temporary support member 14 is joined by a bolt or the like. When there are a plurality of temporary support members 14 in the width direction, they are engaged and connected by a guide member 7 that also serves as a joint member, or when there is no guide member 7, a member can be attached by a detachable bolt or temporary fixing means. Temporary connection or provisional joining in the direction perpendicular to the axis is intended.
(7) The rear end of the leading conduit (preceding steel pipe) 11 is inserted into a cap-shaped receiving portion 20 to which the wide lining element 3 and the temporary support member 14 are inserted, and is fitted and fixed, or the receiving portion 20 The bolts may be detachably fixed to the wide lining element 3 or the temporary support member 14 from the outside of the rim.
A contact portion between the rear portion of the wide lining element 3 and the pressing portion of the propulsion device 12 is similarly provided with a cap-shaped receiving portion, and is detachably fixed by fitting or bolting. Further, the wide lining element 3 and the temporary support member 14 are integrated by being bound by a belt-like band or integrated by bolting.
(8) The wide lining element 3 and the temporary support member 14 are pushed in the propulsion direction by the plural propulsion devices 12, and the leading conduit 11 pushed out toward the reaching shaft 18 is sequentially carried out from the reaching shaft 18. The process is repeated until the wide lining element 3 and the temporary support member 14 arrive at the reaching shaft 18.
(9) The joint portion 6 between the reference pipe 2 and the wide lining element 3 is washed with a water jet and vacuumed to be discharged. A laterally tightened PC steel material 5 (longitudinally tightened PC steel material 5) is inserted in the lateral direction of the reference pipe 2 and the wide lining element 3 on the ceiling and floor (or side wall).
(10) Fill the cleaned joint portion 6 with a filler 4 such as mortar (grout). After the predetermined strength of the grout is confirmed, the laterally tightened PC steel material 5 and the vertically tightened PC steel material 5 are tensioned and fixed on the inner wall of the reference pipe 2.
(11) Arrange the bar in the reference pipe and place concrete in the reference pipe 2.
(12) After the underground structure 1 with the temporary support member is formed by the wide lining element 3 and the temporary support member 14, the earth and sand inside the structure 1 is excavated. In the temporary support member 14 in which a large number of temporary support member units are loosely connected by the guide member, the temporary support member units that are easily removed during excavation are sequentially removed to expose the wide lining element 3.
(13) If necessary, finish the inner surface to complete the underground structure 1 such as a tunnel.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing in order to demonstrate the case where the underground structure of one Embodiment of this invention is constructed | assembled, Comprising: (a) is knitting | organizing a drilling device, a steel tip conduit, a support member with a wide lining element, and a propulsion device in series. The side view which shows the state which carried out, (b) is a partially longitudinal side view which shows the state which has inserted the front-end | tip part of the support member with a wide covering element in the receiving part of the rear-end part of a steel tip conduit, (c) The side view which shows the form which temporarily fixes the rear-end part of a steel tip conduit, and the support member with a wide lining element by welding, (d) is a schematic which shows the form in the case of connecting the supporting members with a lining element in series Side view (e) is a side view showing a state in which a drilling device, a steel tip conduit, a support member with a wide lining element, and a propulsion device are knitted in series. It is a figure which shows the construction process in the case of constructing the underground structure of one Embodiment of this invention. It is a figure which shows the construction process in the case of constructing the underground structure of one Embodiment of this invention. It is a figure which shows the construction process in the case of constructing the underground structure of one Embodiment of this invention. It is a vertical front view which shows the underground structure of one Embodiment of this invention. It is a vertical front view which shows the underground structure of one Embodiment of this invention. It is a top view which shows the form which arrange | positioned the several precast concrete board in parallel and integrated it to the one plate-shaped object. It is a vertical front view of the other form of this invention which connects a small temporary support member unit and construct | assembles an underground structure. It is a vertical front view which shows one form of the conventional underground structure. It is a vertical front view which expands and shows the corner part of the conventional underground structure. It is the perspective view for demonstrating the state which the guide member of the conventional lining elements mutually engages and is connected, and a joint part being parted by a guide member. It is a vertical front view which shows the form in the case of constructing an underground structure by the conventional method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underground structure 2 Standard pipe 3 Wide lining element 3a Covering element 4 Filling material 5 PC steel material 5a PC steel material 5b PC steel material 6 Joint part 6a Joint part 6b Joint part 6c Joint part 7 Guide member 8 Excavation cutter 9 Auger 10 Drilling destination pipe 11 Steel tip conduit 12 Propulsion device 13 Underground 14 Temporary bearing member 14a Temporary bearing member 15 with wide lining element 15 Upper plate 16 Lower plate 17 Starting shaft 18 Reaching shaft 19 Coupler 20 Receiving portion 21 Underground with temporary bearing member Structure housing 22 band

Claims (4)

  In an underground structure in which a lining element is arranged between the reference pipes, a single wide lining element that is thinner than the outer dimensions of the reference pipe is promoted between the reference pipes provided at the corners at intervals. An underground structure characterized by being installed.   The underground structure according to claim 1, wherein a filler is filled between a reference pipe and the wide lining element.   PC steel is placed between the wide lining element and the reference pipes on both sides of the wide lining element, and tension is introduced into the PC steel and fixed, and prestress is introduced to the wide lining element. The underground structure according to claim 1, wherein the underground structure is integrated with each of the reference pipes.   In the construction method of the underground structure in which the lining elements are arranged between the reference pipes, between the reference pipes provided at the corners at intervals, one piece thinner than the outer dimensions of the reference pipe A construction method of an underground structure, characterized in that it is installed so as to promote a wide lining element.

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