JP4073428B2 - Underground construction method - Google Patents

Description

  The present invention relates to a method for embedding and constructing an underground structure that becomes an underpass in the ground directly below these tracks and roads across a track and roads.

Conventionally, for example, when an underground passage is built by propelling an underground structure that is an RC concrete structure in the ground under the track, as described in Patent Document 1, first, the track is sandwiched between After excavating shafts on the start side and the arrival side of the underground structure on both sides of the underground structure buried design area under the orbit, a friction cut plate is placed on the upper surface at the buried design drawing position of the upper floor of this underground structure A plurality of rectangular steel pipes are propelled and buried in parallel from the starting side to form a pipe roof that penetrates to the arrival side, and then the underground structure is installed on the starting side and the front end surface of the upper floor is piped While abutting against the rear end of the roof, excavating the ground in front of the underground structure and propelling the underground structure, leaving the friction cut plate in an immovable state, pipe pipe along the lower surface of the friction cut plate. The extruded arrival side have been made to bury the underground construction in embedded plan area.

JP 60-62398 A

However, according to the above method, the steel pipe for forming the pipe roof is propelled before the underground structure is propelled and buried in the buried design area of the underground structure on the ground directly under the track between the starting side and the reaching side. To embed, steel pipes are pushed in parallel from the starting side to the arrival side, and the underground structure is waiting for the completion of the pipe roof construction work. Currently, we are preparing for the promotion and burial work.

  In order to install an underground structure on the start side, it is necessary to sequentially perform operations such as assembling the formwork, placing bars in the formwork, placing concrete, curing, installing propulsion equipment, etc. As described above, since these operations are performed after the pipe roof construction work is completed, there is a problem that the construction period is remarkably prolonged and the construction cost is increased.

  The present invention has been made in view of such problems, and its purpose is to enable the promotion of underground structures in parallel with the construction work of the pipe roof and the preparation of the construction work, thereby shortening the construction period. And to provide an underground construction method that can reduce construction costs.

In order to achieve the above object, an underground structure embedding method according to claim 1 is provided with a start side shaft and an arrival side shaft of the underground structure on both sides of a buried design area of the underground structure, In the ground of the buried design area so as to penetrate between the starting side shaft and the arrival side shaft, the steel pipes with friction cut plates placed on the upper surface are propelled and buried so that they are in parallel with each other. After forming the pipe roof, the above-mentioned friction cut plate is fixed and the underground structure is advanced along the lower surface of the friction cut plate to replace the pipe roof with the underground structure. In the method of burying in the ground directly below, the depth of the start side shaft is set to a depth that allows the underground structure to be propelled and buried, while the depth of the arrival side shaft is less than that of the start side shaft. Shallow and above Promoted steel pipe for forming a Ipurufu, after forming the implantable depth, promoting the plurality of steel pipes mounted with the friction-cut plate to the upper surface toward the starting side pit from the arrival side pit, is buried while forming the pipe roof by advancing the underground construction in the starting side pit during construction of the pipe roof, and prepares work buried, after accordingly, buried underground construction along the lower surface of the friction-cut plate Proceed toward the planned area, and according to the promotion of this underground structure, remove the length of the steel pipe that is pushed out to the arrival side shaft with the shallow depth by the length corresponding to the length of the promotion while removing from the start side shaft An underground structure is buried so as to penetrate the shaft .

According to the underground construction method of the present invention, after providing the start side shaft and the arrival side shaft of the underground structure on both sides sandwiching the buried design area of the underground structure, a plurality of from the arrival side shaft promote steel towards the starting side pit, because characterized in that to form a pipe roof and buried in parallel to the construction work of the pipe roof, when construction of the underground construction with the starting side pit Can perform operations such as assembly of formwork to build the underground structure, reinforcement in the formwork, placement of concrete, curing, installation of propulsion equipment, etc. Even if it consists of concrete structures, concrete curing, installation work for underground structures, installation work for propulsion devices, etc. can be performed in parallel, so burying and construction work for underground structures Is smooth and efficient It is possible to reduce the construction costs it is possible to shorten the construction period can be.

  A specific embodiment of the present invention will be described with reference to the drawings. First, a start side 3 of an underground structure 2 is placed on one side of the track 1 across a road or a track (hereinafter referred to as a track 1). An arrival side 4 of the underground structure 2 is formed on the side. In this case, the start side 3 and the arrival side 4 may be formed by a start shaft and a reaching shaft that have excavated shafts on both sides of the track 1 as shown in FIG. When there is a wide space with respect to the slope, it is only necessary to set one side to the start side 3 and the other side to the arrival side 4 without necessarily excavating a shaft.

The earth retaining works 10 and 11 are constructed on the excavation wall surfaces of the shafts on the start side 3 and the arrival side 4 , and the base concretes 12 and 13 having a flat upper surface are placed on the bottom surface of the shaft. At this time, the depth of the shaft on the start side 3 (hereinafter simply referred to as the start side 3) is set to a depth at which the underground structure 2 can be propelled and buried, while the shaft on the arrival side 4 (hereinafter simply referred to as reach). steel pipe 5a for forming a pipe roof 5 the depth of the side 4) is promoted, implantable depth, i.e., previously formed in a shallow pit depths than vertical shaft of the starting side.

  Thus, after providing the start side 3 and the arrival side 4 on both sides of the track 1, as shown in FIG. 2, the underground structure in the underground structure buried design area of the ground 7 from the arrival side 4 under the track. In the upper floor portion embedded in the upper floor portion 2, a plurality of rectangular steel pipes 5 a each having a friction cut plate 6 made of a strip steel plate placed on the upper surface are propelled and embedded so as to be in parallel with each other. While the pipe roof 5 penetrating is formed, on the start side 3 during the construction of the pipe roof 5, the underground structure 2 is propelled and buried.

  In order to propel and embed the steel pipe 5a from the arrival side 4 toward the start side 3, a guide base 14 of the steel pipe 5a is provided on the base concrete 13 of the arrival side 4, and the steel pipe 5a is set on the start side 3 of the guide base 14. The excavator 15 is installed so as to be slidable and movable in the lengthwise direction, and the steel pipe 5a is propelled and buried in the ground 7 under the track. The guide gantry 14 has a height at which the steel pipe 5a can be propelled and buried in a portion corresponding to the buried height position of the upper floor board of the underground structure 2 in the underground structure buried design area of the ground 7 under the track. Install. At this time, when the underground structure 2 is embedded horizontally, the guide frame 14 is also installed so that its steel pipe guide surface is horizontal.

  A drilling means (not shown) made of a screw auger is removably inserted in the steel pipe 5a, and the face ground on the open end side of the steel pipe 5a facing the starting side 3 is excavated by the auger head. The excavation propulsion unit 15 includes propulsion means (not shown) made of a propulsion jack and rotation drive means for the excavation means. Thus, the guide frame 14 is configured to be movable toward the start side 3 and fixed to the position after the movement so that the steel pipe 5a can be propelled and the excavating means can be driven to rotate. In addition, excavation in the steel pipe 5a can be performed by human power without using a screw auger.

  Further, the friction cut plate 6 placed on the steel pipe 5a has a tip directed toward the starting side 3 fixed to the tip of the steel pipe 5a by welding or a bolt or the like, and this steel pipe 5a is connected to the reaching side by the excavator 15. After propulsion and burying from 4 to the starting side 3 at the above-mentioned predetermined height position of the ground below the track 1, the next steel pipe 5a is similarly propelled by the excavating propulsion machine 15 along one side surface of this steel pipe 5a. Buried. As shown in FIG. 7, a pair of upper and lower engaging protrusions 16, 16: 17, 17 having an L-shaped cross section are provided at the upper and lower portions on both side surfaces of the steel pipe 5 a to the full length. Projecting parallel to the pipe axis direction, projecting from the reaching side 4 toward the starting side 3, projecting on the opposite side of the next steel pipe 5a on the engaging ridges 16 and 16 of the steel pipe 5a The steel pipe 5a is propelled and embedded so that the engaging protrusions 17 and 17 engaged with each other are engaged to be in a parallel state.

  In addition, when the length of the buried design area of the underground structure 2, that is, the distance between the start side 3 and the arrival side 4 is several times the length of the steel pipe 5a, the length obtained by dividing the distance into several parts The steel pipe 5a having a thickness is sequentially added in series, and only the friction cut plate 6 on the front steel pipe 5a is fixed to the tip of the steel pipe 5a while the front and rear steel pipes are integrally connected by adding them. The friction cut plates 6 and 6 on 5a and 5a are propelled and buried by the excavator 15 while being integrally connected to each other so as to form one friction cut plate by welding. In this way, by embedding a plurality of steel pipes 5a whose tips reach the starting side 3 in parallel, as shown in FIG. 3, the upper floor of the underground structure 2 in the underground structure embedding design area of the ground 7 under the track. A pipe roof 5 having substantially the same width as that of the underground structure 2 is formed at a portion corresponding to the buried height position of the portion 2a.

  In this way, on the arrival side 4, the pipe roof 5 reaching from the arrival side 4 to the start side 3 is formed, while on the start side 3, the underground structure 2 is parallel to the pipe roof 5 formation operation. Preparatory work for propelling and burying the vehicle from the start side 3 toward the arrival side 4 is performed. Specifically, the guide side 14 of the steel pipe 5a is arranged on the arrival side 4, the excavation propulsion unit 15 is arranged on the guide base 14, and the plural pipes 5a are propelled and buried by the excavation propulsion unit 15. When building the underground structure 2 on the start side 3 during the work, etc., the assembly work of the formwork, the rebaring work in the formwork, concrete placement, curing, underground structure Installation work of the propulsion device 8 for the object 2 is performed.

  When the underground structure 2 is made of a precast concrete structure, the underground structure 2 can be carried into the start side 3 in parallel with the pipe roof 5 forming operation, installed, and a plurality of propulsion jacks can be used. The propulsion of the underground structure 2 such as the installation work of the propulsion device 8 and preparation work for burial are performed. Further, in order to stabilize the ground above both sides of the underground structure 2 at the time of propulsion and burial of the underground structure 2 on both sides of the pipe roof 5, a plurality of circular steel pipes 5b having a circular cross section from the arrival side 4 are provided. (Shown in FIG. 3) are embedded in parallel. This overhanging steel pipe 5b is left in the ground when the underground structure 2 is propelled and buried.

  When the work for forming the pipe roof 5, the promotion of the underground structure 2, and the preparation work for the burial are completed, the process proceeds to the promotion and burial of the underground structure 2. At this time, as shown in FIG. 4, the tips of the friction cut plates 6 are released from the tips of all the steel pipes 5a of the pipe roof 5 protruding to the starting side 3 in advance. The guide frame 14 is removed on the arrival side 4 while being fixed to a fixed point such as the earth retaining work 10 behind the start side 3 via a fixing member 19. Moreover, the blade edge 9 is attached to the front end opening (the arrival side direction is the front side) facing the arrival side 4 in the underground structure 2.

  After that, the plurality of propulsion jacks constituting the propulsion device 8 installed between the rear end of the underground structure 2 and the rear wall surface of the start side 3 are extended to move the underground structure 2 below the track 1. The front end of the upper floor 2a is pushed toward the buried design area, press-fitting the blade 9 into the ground, and the upper surface 2a of the underground structure 2 is in contact with the lower surface of the friction cut plate 6 on the pipe roof 5. The surface is pressed against the rear end surface (projecting end surface) of the pipe roof 5 and embedded in the embedded design area.

  When the propulsion jack of the propulsion device 8 is extended and the underground structure 2 is excavated in front of the underground structure 2 and is propelled and buried in the buried design area in the ground 7 under the track, the pipe roof 6 is Since all formed steel pipes 5a are pushed out to the reaching side 4 by a length corresponding to the propulsion length, the length portion is removed. Further, every time the underground structure 2 is propelled and buried for a certain length, the piston rod of the propulsion jack of the propulsion device 8 is contracted and the reaction force is received in the buried design area between the propulsion device 8 and the rear wall of the start side 3. As shown in FIG. 5 with the spacer 18 interposed, the propulsion jack is extended again to propel the underground structure 2. In addition, when the length of the underground passage to be built by the underground structure 2 is long, the underground structure having a length obtained by dividing the length of the underground passage may be promoted and buried while sequentially connecting.

  Thus, the underground passage 2 is constructed by burying the underground structure 2 penetrating from the start side 3 to the arrival side 4 in the ground 7 below the track 1 along the lower surface of the friction cut plate 6. After that, as shown in FIG. 6, the base concrete 12 and 13 are removed on the starting side 3 and the reaching side, respectively, and then the inside of the starting side 3 and the inside of the reaching side are backfilled, thereby passing the passage in the underground structure 2 Slopes 20 and 21 that reach the ground from both open ends are respectively formed, and the construction work of the underground passage composed of the underground structure 2 is completed.

As shown in FIG. 8 , the side wall roof may be formed by embedding a plurality of round steel pipes 5b in parallel in the vertical direction. In this case, the side wall roof 5B is not embedded in the portion corresponding to the both side wall portions 2b, 2b of the underground structure 2, but the both side walls are formed outside the both side wall portions 2b, 2b of the underground structure 2. It is buried so as to sandwich the parts 2b and 2b. And after burying underground structure 2 in a buried design area, it is not necessary to remove.

Since the round steel pipe 5b is buried in the vertical direction in the ground located outside the both side walls 2b, 2b of the underground structure 2 as described above, the pipe roof 5 from the arrival side 4 is Uses start side 3 where the depth of the shaft is deeper than the arrival side 4 because it has little effect on the propulsion and burial preparation work of the underground structure 2 performed on the start side 3 side in parallel with the formation work to driven towards reaching side 4 from the start side 3, it can be embedded.

The simplified vertical side view of the state which provided the start side and the arrival side on both sides of the track. The simplified vertical side view of the state which forms the pipe roof. The simplified longitudinal front view of a pipe roof. The simplified vertical side view showing the state immediately before the underground structure is promoted and buried. A simplified longitudinal side view of a state where an underground structure is propelled and buried. The simplified longitudinal side view of the state that formed the underpass. The longitudinal front view of a steel pipe. The simplified vertical front view which shows the modification of this invention.

Explanation of symbols

1 Track 2 Underground structure 3 Starting side 4 Arrival side 5 Pipe roof
5a Steel pipe 6 Friction cut plate 8 Propulsion device
15 Excavator

Claims (1)

In the underground structure, the start side shaft and the arrival side shaft are provided on both sides of the buried design area, and the ground of the buried design area so as to penetrate between the start side shaft and the arrival side shaft , After the pipe roof is formed by propelling and embedding a plurality of steel pipes on which the friction cut plates are placed in parallel with each other, the bottom surface of the friction cut plates is made with the friction cut plates fixed. The underground structure is embedded in the ground directly under the road or track while the underground structure is moved forward along the pipe roof and the underground structure is replaced . While making the depth possible for propulsion and embedding work, the steel pipe for forming the pipe roof is formed to a depth that allows propulsion and embedding because the depth of the arrival side shaft is shallower than the start side shaft. later Promoting a plurality of steel pipes mounted with the friction-cut plate to the upper surface toward the starting side pit from the arrival side pit, while forming a pipe roof by embedding, the starting side pit during construction of the pipe roof Then, the underground structure is advanced and the preparation work for burial is carried out, and then the underground structure is propelled along the lower surface of the friction cut plate toward the buried design area. Underground structure characterized in that underground structure is buried so as to penetrate from start side shaft to reaching side shaft while removing the length of steel pipe pushed out to reach side shaft with shallow depth above Burial method.

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