JP2566162B2 - Method for cutting and expanding between parallel tunnels and supporting device used therefor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for expanding and cutting between parallel tunnels and a supporting device used for the method.

“Problems to be solved by conventional techniques and inventions” Conventionally, as a method of constructing a platform or the like by expanding the space between tunnels, a method by excavation from the top, a roof method from inside the tunnel, or a girder girder method is used. Has been.

However, in the case of the excavation method, there are cases in which it is used in small-scale structures such as vertical shafts due to the structure of the tunnel upper part, the tunnel depth, etc.

Secondly, the roof method is often based on a shield or a pipe, but it has a drawback of increasing the amount of excavation.

Therefore, there is a method of using a girder girder as a method to reduce the amount of excavation, but in this case it will be difficult to construct if errors occur on the left and right tunnels, and it will be a work in a narrow work space above the tunnel. , It is often the case that the short girder material is inserted while being spliced, which is disadvantageous in terms of construction period and construction cost.

In addition, as a common problem with these construction methods, it is essential that the horizontal and vertical construction errors be between several cm and several tens of cm between the tunnels when constructing parallel tunnels. When installing support members, etc., measure the distance between parallel tunnels each time, and if it becomes a large support member, it will be installed by repeatedly cutting or welding the end of the member after installing a joint, but in a perfect condition There was a problem that it was difficult to install in, and the construction was complicated.

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention excavates an upper portion between parallel tunnels, and joins a pair of left and right horizontal supporting steel members to the top end of the face with one tip end portion. One end of the steel material is fastened with a bolt, and the other end is temporarily tightened with a bolt so as to be slidable in the axial direction on the tip end portion of the other horizontal supporting steel material, and the rear end portion of the joint steel material and the other horizontal portion behind the joint steel material. In a state where the other horizontal supporting steel material is slid by the jack installed between the reaction force receiving members provided on the supporting steel material, and the rear ends of the left and right horizontal supporting steel materials are closely adhered to and supported by the outer peripheral surfaces of the left and right parallel tunnels. , The joint steel material and the other horizontal support steel material are fastened by bolts, the lower part of the horizontal support steel material is supported by a holding member, and the horizontal support steel material is similarly installed between parallel tunnels while sequentially excavating. By installing, the pair of left and right horizontal supporting steels can be slide-adjusted by jacks through the joint steels according to the construction error between the parallel tunnels, and even in a narrow working space, the horizontal supporting steels can be very easily and reliably installed between the parallel tunnels. The present invention proposes a rational cutting and expanding method and a supporting device used for the method, in which the ends can be installed closely and the amount of tunnel excavation is small.

[Embodiment] An embodiment for constructing a platform shown in the drawings for the present invention will be described below. The left and right parallel tunnels 1, 1 '
A side home consisting of columns, beams, and floors will be constructed as the side part 2 of the structure intended to be cut and expanded integrally with the adjacent inner wall part of, and the protective temporary structure 3 of the parallel tunnels 1, 1'will be installed. .

In this state, one side of the upper part of the parallel tunnel 1,1 'is excavated for a required length, and a horizontal supporting steel material 4 made of a shape steel such as H-shaped steel is erected on the upper face of the face, and the rear end of the horizontal tunnel 1 is formed on one side.
While supporting it in the engaging recess provided on the outer wall of, and supporting the tip end thereof on the temporary support column 5, the earth retaining plate 6 such as wood sheet pile and the girder material 7 are inserted and installed between the horizontal supporting steel material 4 and the ground. Stabilize.

Next, the upper portion on the other side is excavated, the horizontal supporting steel material 4'is built in the same manner as above, and after being supported by the temporary support column 5, this and the previous horizontal supporting steel material 4 are connected via the joint steel material 8.

The horizontal support steel material 4 is provided with a required number of bolt holes 9 at its web front end, and the horizontal support steel material 4'is provided with a plurality of upper and lower rows of bolt holes 10 along the axial direction at the web front end thereof. The long hole 10 is provided so as to have a length within a predicted construction error range between the parallel tunnels 1 and 1 '.

A reaction force receiver 11 is provided behind the elongated hole 10 of the horizontal supporting steel material 4 '.

The joint steel material 8 is made of grooved steel or the like that can be affixed to both sides of the web of the horizontal supporting steel materials 4 and 4 ', and bolt holes 9 are provided at the front and rear ends thereof.
And bolt holes 12 and 12 'that match the pitch of the elongated holes 10, and a reaction force receiver 11' is provided at one end thereof.

When connecting the left and right horizontal supporting steel members 4 and 4 ', joint steel members 8 are abutted on both sides between the tip portions facing each other, and a washer plate 13 is abutted on the joint steel members 8, and then the bolt holes 12 and The high tensile bolts 14 are inserted into the bolt holes 9 of the supporting steel material 4 to fasten and fix them, and the high tensile bolts 14 are attached to the bolt holes 12 'on the other side of the joint steel material 8 and the long steel 10 of the horizontal supporting steel material 4'. Insert them and temporarily tighten both so that they can slide.

Then, the reaction force of the joint steel material 8 and the horizontal supporting steel material 4'is received 11,1.
Set the jack 15 between the 1'and operate it to slide the horizontal supporting steel material 4'backward so that the rear end is closely contacted with the engaging recess provided on the outer wall of the parallel tunnel 1'on the other side to support it. In this state, the temporarily tightened high-tensile bolt 14 is fully tightened to fasten and fix the joint steel material 8 and the horizontal support steel material 4 ', and the earth retaining plate 6 such as a wood sheet pile and the girder material 7 are inserted and installed between this and the ground. .

In this way, even if there is a construction error between the parallel tunnels 1 and 1 ', the horizontal support steel material 4'slides in conformity with the error and the engagement provided on the outer wall of the parallel tunnel 1'on the other side. It is possible to make close contact with the recessed portion, whereby the left and right horizontal supporting steel members 4 and 4'are connected and integrated by the joint steel member 8 so that the excavated ground can be sequentially supported by the adjustable length beam.

When a load more than designed is applied to the horizontal supporting steel members 4 and 4 ', the horizontal supporting steel members 4'to the joint steel member 8'
Since there is a risk of slipping, a stopper 16 formed by cutting a T-shaped steel or the like is fitted between the tips of the horizontal supporting steel members 4 and 4 '.

Next, excavate the ground in the upper half below the beam, and use the temporary pillars 17 as supporting members or the parallel tunnels 1,
After removing a part of the 1'segment, the beam is supported by a supporting member 18 as a supporting member supported by the beam of the side portion 2.

After that, the segments of the parallel tunnels 1 and 1'exposed on both sides of the upper half of the excavation space are removed and communicated with the inside of the tunnel, and the ceiling slab formwork 19 is installed on the upper part of the excavation space. The ceiling slab 20 is constructed integrally with the beam of the side part 2 by pouring cast-in-place concrete inside.

After removing the formwork 19 and the temporary columns 17, the bottom half of the ground is excavated, the segments exposed on both sides of this excavation space are removed, and the lower cut beam between the floors of the left and right side parts 2, 2 is removed. After the 21 is installed, cast-in-place concrete is poured between the floors to construct an integrated floor 22.

 Finally, the protective temporary structure 3 is removed and the construction is completed.

[Advantages of the Invention] As described above, according to the present invention, the upper portion between the parallel tunnels is excavated, and a pair of left and right horizontal supporting steel members are fastened to the top end of the face and one end portion of the joint steel member is fastened with bolts. At the same time, the other end is temporarily fastened to the tip end of the other horizontal supporting steel member by a bolt so as to be slidable in the axial direction, and the reaction force receiving member provided on the rear end part of the joint steel member and the other horizontal supporting steel member behind the joint steel member is received. With the jack installed in between, the other horizontal supporting steel material is slid, and the rear end portions of the left and right horizontal supporting steel materials are adhered to and supported by the outer peripheral surfaces of the left and right parallel tunnels. The horizontal supporting steel materials are fastened with bolts, the lower side of the horizontal supporting steel materials is supported by a supporting member, and the horizontal supporting steel materials are similarly installed between the parallel tunnels while excavating sequentially, so Depending on the construction error, a pair of left and right horizontal supporting steel materials can be easily slide-adjusted by jacking through the joint steel material, and even in a narrow work space, cutting and welding operations are not required and reliable with extremely simple work. In addition, it is possible to install the end portions of the horizontal supporting steel material in close contact with each other between the parallel tunnels, and it is possible to reduce the amount of excavation between the parallel tunnels and reduce the construction period and cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a series of steps of the invention method,
FIG. 2 is a side view showing the connection state of the beams used in the present invention, FIG. 3 is a sectional view taken along the line AA of FIG. 2, FIG. 4 is a sectional view taken along the line BB of FIG. 2, and FIG. A side view of the tip portion of the horizontal supporting steel material used in the present invention, FIG. 6 is a side view of the joint steel material, and FIG.
FIG. 8 is a side view of the washer plate, and FIGS. 8 (a) to 8 (j) are vertical sectional front views showing a cutting and expanding process in the present invention. 1,1 '... Parallel tunnel, 2 ... Side part, 3 ... Temporary structure for protection, 4,4' ... Horizontal support steel, 8 ... Joint steel,
9 …… Bolt hole, 10 …… Bolt insertion long hole, 12 …… Bolt hole 13 …… Washer plate, 14 …… High tension bolt 15 …… Jack, 16 …… Stopper, 17 …… Temporary column (holding member ), 18 ... Stand (holding member).

Continuation of the front page (56) References JP-A-49-103446 (JP, A) JP-A-53-83324 (JP, A) JP-A-53-95230 (JP, A)

Claims (2)

(57) [Claims] 1. An excavation of an upper part between parallel tunnels, and a pair of left and right horizontal supporting steel materials are fastened to the top end of the face, one end of a joint steel material is fastened to one end portion by a bolt, and the other end is horizontally supported to the other. The bolt is temporarily fastened to the tip of the steel material so as to be slidable in the axial direction by a bolt, and a jack installed between the rear end portion of the joint steel material and the reaction force receiver provided on the other horizontal supporting steel material behind the joint steel material causes the other horizontal In a state where the supporting steel materials are slid and the rear end portions of the left and right horizontal supporting steel materials are closely adhered to and supported by the outer peripheral surfaces of the left and right parallel tunnels, the joint steel material and the other horizontal supporting steel material are fastened with bolts, Support the lower part of the horizontal support steel with a support member,
A method for cutting and expanding between parallel tunnels, characterized in that the horizontal supporting steel materials are similarly installed between parallel tunnels while sequentially excavating. 2. A horizontal supporting steel material having a bolt hole on the side surface of the tip portion, a long hole for inserting a bolt along the axial direction on the side surface of the tip portion, and a jack reaction force receiving member provided on the rear side of the tip portion. Horizontal support steel, a joint steel that can be fastened between the tip ends of the horizontal support steels by bolts, a stopper that can be fitted between the tips of the horizontal support steels, and the horizontal support steels downward A support device for use in a method of cutting and expanding between parallel tunnels, the support device comprising: