JP2018012985A - Installation method for rectangular steel tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation method for a rectangular steel tube, which enables the rectangular steel tube for use in a box-shaped roof for a box-shaped roof construction method to be installed in place of a covering plate and the like, which enables simple and rapid installation, which makes a construction cost low, and which can shorten a construction period.SOLUTION: When rectangular steel tubes 6 serving as unit cylindrical bodies are sequentially connected together and propelled without earth covering, a cutting edge part 7 having front and top surfaces opened is loosely fitted to a tip, and excavation and earth removal are performed by an excavator or manpower so that the cutting edge part 7 can be propelled by a shield jack 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for installing a square steel pipe called a box-shaped roof.

   In order to build the main structure excavation work safely and reliably during the main construction, pipes (steel pipes) are placed horizontally along the outer periphery of the main structure at equal intervals in the form of arches or columns, and roofs and There is a pipe roof method as an auxiliary method for creating walls and protecting ground and underground objects.

  The pipe roof construction method arranges circular steel pipes side by side, and includes a fan-shaped arrangement, a gate-shaped arrangement, an all-around arrangement, a single letter arrangement, and a tandem arrangement.

Pipe roofs are installed when creating underground structures with relatively large cross sections, such as tunnels and box culverts.
1. 1. Large impact of live load 2. There is little earth covering. 3. Protection of the ground surface and existing structures under the ground. 4. Loose earth pressure is large. This is optimal when the impact on the surface of the ground due to excavation can be predicted due to unstable ground conditions.

  Further, the box roof of the box roof method was developed by using a square steel pipe instead of the circular steel pipe of the pipe roof method.

The box-shaped roof construction method is also described in the following patent document. For example, a steel retaining sheet pile is placed beside an upper traffic such as a railway, a starting pit and a reaching pit are constructed, and a press-fitting machine is installed in the starting pit. Then, the box-shaped roof cylinder is press-fitted toward the access pit to form a roof as a protective work.
JP 10-46979 A

  The pipe roof construction method and the box roof construction method exist as auxiliary construction methods when constructing underground structures by three-dimensional intersection (underpass), whereas when constructing under urban roads, A lining plate is used, and a lining plate is laid in the upper opening, that is, a cut portion of the road, so that the opening is temporarily closed, so that an automobile can run on the lining plate and a person can walk. I have to.

  For laying the lining plate, conventionally, for example, a girder is installed on the side of the opening, and the lining plates lifted by a crane or the like are placed on the lining plate one by one.

  The lining board is widely used as a temporary gantry and jetty floor board as well as various road excavation works such as subway construction, underground shopping and underground piping work.

  In this way, in the road surface lining with a lining plate, the lining plate itself is a large one having a large width and length, and a covering girder is installed on the side of the opening and is suspended by a crane or the like. Even if the work boards are placed one by one as if they are placed one by one, it is a large work that takes time and labor.

  Also, the removal of the lining plate is the same because it is performed in the opposite operation to the case of laying.

  An object of the present invention is to install a square steel pipe used for a box roof of a box roof construction method instead of a lining plate, for example, and it is easy and quick to install, and the construction cost can be reduced and the construction period can be shortened. The object is to provide a method of installing a square steel pipe.

  In order to achieve the above object, the present invention according to claim 1 is characterized in that when a square steel pipe as a unit cylinder is sequentially connected and propelled without a cover, a blade portion having a front surface and an upper surface opened at the tip is allowed to play. The gist is that the blade is fitted, excavated and discharged by a shovel car or human power, and propelled by a propulsion jack.

  According to the first aspect of the present invention, by sequentially arranging rectangular steel pipes that are unit cylinders without covering them, this can be used in place of a lining plate. Moreover, the cylindrical body which connected the square steel pipe one by one can be easily propelled by the propulsion jack by excavating and discharging the blade portion by a shovel car or human power and propelling by the propulsion jack.

  Further, since the blade edge portion is loosely fitted, the direction of the blade edge portion can be changed by a shovel car excavation backhoe or the like, and the propulsion direction can be corrected by correcting the direction of the blade edge.

  The present invention according to claim 2 is the rectangular steel pipe connection body in which the guide wall concrete is installed outside the laying position of the square steel pipe and the unit cylinders are sequentially connected, and the first one is propelled along the guide wall concrete. After that, the gist is to propel along the square steel pipe connection body after the sequential installation.

  According to the second aspect of the present invention, the square steel pipe can be accurately set at a predetermined position by installing the guide wall concrete.

  According to the third aspect of the present invention, the rectangular steel pipes that are unit cylinders are bolted with corner flanges, and a key guide groove formed inside the end of the square steel pipe is abutted at the center of the side part. The key point is to hand over the key plate.

  According to the third aspect of the present invention, by attaching the guide for passing the key plate between the key guide grooves in the square steel pipe joint portion, the bolts at the time of connecting the square steel pipe can be easily combined.

  As described above, the installation method of the rectangular steel pipe of the present invention is such that the square steel pipe used for the box roof of the box roof construction method can be installed instead of the lining plate, for example, and the installation can be performed easily and quickly. The construction cost is low and the construction period can be shortened.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a method for installing a rectangular steel pipe according to the present invention, FIG. 2 is a longitudinal side view of the same as above, and 1 in FIG. 1 is a starting part in which a bearing wall 2 is installed at the innermost part. The starting part 1 is formed by excavation from the ground surface.

  In the figure, reference numeral 6 denotes a rectangular steel pipe which is a unit cylindrical body, which is a steel pipe having a substantially square cross section, which is sequentially connected and propelled. As shown in FIGS. 6 and 7, the end connection portion has a substantially triangular corner. Bolts are joined with a square flange 8, and 9 in the figure is a bolt hole formed in the corner flange 8.

  This rectangular steel pipe 6 is a box-shaped roof-type roof construction method used as an auxiliary construction method for constructing a tramway under a railway or road by propelling or towing a box as disclosed in JP-A-9-287383. A roof cylinder can be used, and although not shown in the figure, a male joint in which flange-shaped constituent members are arranged outward on the side surface and a female joint arranged inward in the longitudinal direction may be continuously formed in the longitudinal direction.

  The standard diameter of the square steel pipe 6 is 800 mm to 1000 mm, and the length is 3000 mm to 6000 mm.

  In addition, although illustration is abbreviate | omitted, box opening is formed in the outer surface of the corner part of the square steel pipe 6 on the back side of the corner flange 8, and a nut stop is performed in this recessed part.

  At the center of the side of the connecting end of the square steel pipe 6, the key guide groove 10 is formed by two plates projecting at close intervals inside the end of the square steel pipe, and this key is used when connecting the square steel pipe 6. The guide grooves 10 are abutted with each other, and a key plate 11 made of a plate is passed over the key guide grooves 10 so that the bolt holes can be aligned with each other.

  Moreover, the edge part 7 which opened the front surface and the upper surface is loosely fitted in the square steel pipe 6 used as the head.

  In the figure, 7a is a blade edge at the tip of the blade portion 7 which is a U-shaped tube body, and the rear portion of the blade portion 7 is formed as a skirt portion 7b into which the reduced diameter portion of the front end of the square steel tube 6 is fitted. The excavation part is partitioned by a partition wall 7c.

  In addition, a round bar 7d made of a reinforcing bar or the like is disposed inside the skirt portion 7b, and the reduced diameter portion of the front end of the square steel pipe 6 and the skirt portion 7b are not in surface contact but in line contact with each other for loose fitting. .

  At the time of construction, guide wall concrete 12 is installed outside the laying position of the square steel pipe 6 in front of the starting portion 1.

  Further, in the starter 1, a jack cradle 5 is placed in front of the bearing wall 2 and a propulsion jack 3 is installed here. A foundation concrete 13 is laid on the floor of the starter 1, and the first square steel pipe 6. Is set in front of the propulsion jack 3 with the cutting edge 7 attached.

  4, the excavation bucket 14a of the backhoe 14 is excavated in front of the blade mouth portion 7, and the square steel pipe 6 is propelled together with the blade mouth portion 7 by the propulsion jack 3.

  The direction correction is performed by changing the direction of the blade edge portion 7 by the excavating bucket 14a of the excavating backhoe 14, or the like.

  After propelling the square steel pipe 6, the strut 4 is installed between the propulsion jack 3 and the square steel pipe 6, and the struts 4 are sequentially increased so that a new square steel pipe 6 can be installed between the propulsion jack 3 and the square steel pipe 6. The square steel pipe 6 is pushed forward.

  The strut 4 is removed, a new square steel pipe 6 is suspended after the square steel pipe 6, and the square steel pipes 6 are bolted together. At that time, the key guide grooves 10 are abutted with each other, and the key plate 11 is passed over the key guide grooves 10 by a plate body, thereby aligning the bolt holes.

  When the square steel pipe connection body is installed while adding the square steel pipe 6 by a predetermined length in this way, the second square steel pipe connection body is propelled along the existing square steel pipe connection body in parallel therewith. Then, the same number of steps are repeated in parallel.

  The paralleled rectangular steel pipe joints are propelled without covering, and can be used in place of the road lining plate or the concrete box 15 (box culvert) as shown in FIG. It is used as a protective work.

It is a top view which shows one Embodiment of the installation method of the square steel pipe of this invention. It is a vertical side view which shows one Embodiment of the installation method of the square steel pipe of this invention. It is a front view after installation of the square steel pipe of the present invention. It is a top view of the principal part which shows one Embodiment of the installation method of the square steel pipe of this invention. It is a vertical side view of the principal part which shows one Embodiment of the installation method of the square steel pipe of this invention. It is a front view of a square steel pipe connection end. It is a vertical side view of a square steel pipe connection end.

DESCRIPTION OF SYMBOLS 1 ... Starting part 2 ... Bearing wall 3 ... Propulsion jack 4 ... Strut 5 ... Jack cradle 6 ... Square steel pipe 7 ... Blade part 7a ... Blade part 7b ... Skirt part 7c ... Bulkhead 7d ... Round bar 8 ... Corner flange 9 ... Bolt hole 10 ... Key guide groove 11 ... Key plate 12 ... Guide wall concrete 13 ... Foundation concrete 14 ... Backhoe 14a ... Bucket 15 ... Concrete box

Claims (3)

  When connecting square steel pipes, which are unit cylinders, in order and propelling them without covering, the blade edge with the front and top surfaces open at the tip is loosely fitted, and the blade edge is excavated and discharged by a shovel car or human power. Installation method of square steel pipe characterized by earthing and propelling with a propulsion jack.   A square steel pipe connecting body, in which the guide wall concrete is installed outside the laying position of the square steel pipe and the unit cylinders are sequentially connected, is propelled along the guide wall concrete for the first one, and then the squares after the sequential installation The installation method of the square steel pipe of Claim 1 propelled along a steel pipe connection body.   The square steel pipes which are unit cylinders are bolted with a corner flange, and a key guide groove formed inside the square steel pipe end is abutted at the center of the side, and a key plate is passed over the key guide grooves. Or the installation method of the square steel pipe of Claim 2.

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