JPH0433960B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a cutting edge body that enables efficient burying of girders with a rectangular cross section for constructing underground structures.

(Prior technology) When constructing underground structures under railways, roads, or existing buildings, recently, factory-produced concrete girders of a certain length (approximately 5 m to 10 m) are set in front of the excavation propulsion machine. and do this directly,
Press-fit into the ground in parallel along the outline of the target structure,
The soil inside was then excavated and the concrete girders pressed in parallel were used not only as protection during construction, but also as the underground structure itself.

When burying concrete girders,
As shown in Figure 6 A and B, a paddle-shaped or desk-shaped cutter c is attached to the front end of the screw auger a connected to an excavation propulsion machine (not shown), while a cutter pipe d is attached to the front end of the concrete girder b. , insert the screw auger a into the center hole of the concrete girder b, position the cutter c in the cutting pipe d, move the screw auger a forward while rotating, and remove the dirt from the front with the cutter c. While excavating, concrete girder b is being press-fitted into the ground.

(Problems to be Solved by the Invention) By the way, in the above-mentioned conventional device, the cutter attached to the front end of the central screw auger exclusively excavates the ground in front of the ground, so the concrete girder to be press-fitted and the blade to guide it are excavated. The size and shape of the mouth pipe is limited by the size of the cutter, and it is generally square or round with a size commensurate with the length (diameter) of the cutter. Therefore, it is necessary to bury a large number of concrete girders during construction. It takes a long time, but if a horizontally or vertically long rectangular cross-section cutter is used to reduce this time, there will be a large amount of uncut parts that cannot be removed with the cutters, making it difficult to press in concrete girders of the same shape.

Therefore, this invention is a method for burying rectangular girders that can easily and reliably bury even concrete girders or steel box girders with larger rectangular cross-sections in the ground, reducing construction time and construction costs. The purpose is to provide a cutting edge body.

(Means and effects for solving the problems) Based on the above object, the present invention is designed to provide a cutting edge body for burying a rectangular girder by excavating into the inner front part of a rectangular box-shaped body with open front and rear sides. A screw vine with spiral blades in different directions on the left and right sides is installed so as to be rotatable orthogonal to the axis of the screw auger connected to the propulsion machine, so as to bring the earth and sand to the center.
A partition wall having a central opening and an inner wall converging toward the opening are provided at the inner rear part of the box-like body, and the screw cutter is rotated by a screw auger or other prime mover to excavate the earth and sand in front. It is characterized by the following.

Then, a concrete girder or a steel box girder with a rectangular cross section is connected to the rear open part of the cutting mouth body, and the screw auger is rotated and propelled together with the rectangular girder.
When the screw cutter is rotated through a transmission mechanism, the screw cutter perpendicular to the auger shaft digs up the earth and sand in front of the cutting mouth body, and the earth and sand that has been dug up are brought to the center by each helical blade and disposed inside. The inclination of the wall causes it to be moved to the rear opening, from which it is expelled by a screw auger through the center hole of the rectangular girder, and the rectangular girder is correspondingly pressed into the ground.

(Embodiment) Figures 1 to 3 show an embodiment of the present invention, in which 1 is a box-shaped cutter mouth body that has a horizontally long rectangular shape and is open at the front and back sides; In the center of the first half, a gearbox 2 with a mountain-like tip 2a attached to the front is arranged along the axis of a screw auger 13, which will be described later, and is fixed to the upper and lower walls of the cutting edge body 1 via a profile 9. Between both side walls of the gear box 2 and both side walls of the cutting edge body 1, there are screw cutters 3, 3' and 4, which form a pair on the left and right.
4' are rotatably arranged in two stages, upper and lower, perpendicular to the axis of the auger 13.

Left, right, top and bottom screw cutters 3, 3', 4,
4' consists of core shafts 3a, 3a', 4a, 4a' and helical blades 3b, 3b', 4b, 4b' provided on the peripheral surface thereof, and the periphery of each helical blade 3b, 3b', 4b, 4b'. There are many cemented carbide bits 3c and 3 in the part.
c', 4c, 4c' are attached, and the left and right helical blades 3b and 3b' and 4b and 4b' have different spiral directions, respectively, and are designed to gather excavated earth and sand to the center. , each axis 3
A, 3a' and 4a, 4a' have short shafts 5, each consisting of a square part and a circular part, attached to their outer ends so as to rotate together as shown in FIG. 4A.
is rotatably supported on the side wall of the cutting edge body 1 via an outer bearing member 6a, while the left and right shafts 3a and 3
Each of the inner ends of a', 4a and 4a' has square parts on both sides and a circular part in the center as shown in FIG. A wheel 8 is located in the gear box 2, connected to rotate together with the intermediate shaft 7 passing through the box 2, and rotatably supported by the gear box 2 via an inner bearing member 6b.

Screw auger 3a, 3a' and 4a, 4
The above-mentioned support structure for a' is easy to manufacture and convenient for assembly, but this is just an example, and the core shaft can be rotatably supported directly on the bearing member 6a without providing the short shaft 5 at each outer end. You may also
Also, the inner end is not connected by the intermediate shaft 7, but the left and right shafts 3a, 3a' or 4a, 4a' are made into one, supported through the gearbox 2, and the worm wheel 8 is mounted in the center. Good too.

As shown in FIG. 3, a worm 10 is rotatably supported in the center of the inside of the gear box 2 along the front and rear axes with its square shaft end protruding from the rear wall of the box, and the upper and lower screw cutters are connected to the gear box 2. The worm wheel 8 is engaged with the worm wheel 8.

On the other hand, inside the cutting edge body 1, on the rear side of the gearbox 2, there is provided a partition wall 11 having an opening 11a for inserting the screw auger 13 and for discharging earth and sand, and an inner wall 12 converging toward the opening 11a. is provided.

Based on the above configuration, when burying the concrete girder, the tip of the concrete girder 15, which has a rectangular cross section and a constant length that matches the shape of the cutting edge body 1, is fitted into the open back surface of the cutting edge body 1. At the same time, the shaft end of the screw auger 13 inserted into the center hole 15a of the concrete girder 15 is fitted and connected to the shaft end of the worm 10 protruding from the gearbox 2. Of course, in Fig. 3, there is a large diameter helical blade 1 between the worm 10 and the screw auger 13.
3' was inserted, but this is Screw Auger 1
In some cases, it may be combined with 3 or omitted.

Thus, the screw auger 13 is rotated by a propulsion device set in the starting shaft as usual, and the auger 13 and the concrete girder 15 are propelled into the ground at a constant speed.

Due to the propulsion of the screw auger 13 and the concrete girder 15, the tip 2a at the front of the gearbox and the peripheral cutting edge of the cutting edge body 1 sink into the ground, and at the same time, the rotation of the screw auger 13 causes the worm connected to its front end to sink into the ground. 10, the transmission is transmitted to the upper and lower worm wheels 8 that engage with the worm wheels 8, causing the left and right upper and lower screw cutters 3, 3', 4, 4' to rotate in the same direction and at the same speed, so that each helical blade 3b, 3b', Bits 3c, 3c', 4c, 4c' fixed to the periphery of 4b, 4b' are used to dig up the earth and sand in front, and the earth and sand that has been dug up are removed by spiral blades 3b, 3b', 4b, 4b'. It is moved toward the center opening 11a by the inner wall 12 that is gathered to the center and converged to the center, and passes through the center hole 15a of the concrete girder 15 from the opening 11a by the action of the spiral blade of the screw auger 13. It is removed into the starting shaft, and correspondingly, concrete girders 15 are sequentially press-fitted into the ground.

At this time, screw cutters 3a, 3a', 4a, and 4a' extending from side to side are arranged in upper and lower two stages inside the cutting edge body 1 at the tip. It is possible to dig down every corner without creating any cracks, and since thrust is applied to each part on average, the cutting edge body 1 does not bend.

In this way, the required number of concrete girders 15
After press-fitting in parallel in the horizontal direction, the horizontally elongated cutter body 1 and concrete girder 15 at the lower left and right ends are rotated 90 degrees to make them vertically elongated, and then press-fitted into the ground one after another. By excavating and removing the earth and sand inside, an underground concrete structure A as shown in Fig. 5 is constructed.

In addition, although the above-mentioned example explained the case where a concrete girder with a rectangular cross section was buried, the present invention is not limited to this and can also be applied to burying a steel box girder.

In addition, it is preferable to have the screw cutter in two stages, upper and lower, as described above, to maintain balance, but it is not limited to this, and it is also possible to use a single stage.The turning power for the screw cutter is provided by a motor built in separately from the auger shaft A gear box may be disposed on the side of the cutting edge body to transmit the information.

(Effects of the Invention) As described above, in this invention, the cutting edge body for embedding concrete and steel girders is made into a rectangular box-like body with open front and rear sides, and the direction of the helical blade is marked on the left and right at the inner front part. Different screw vines are installed perpendicular to the axis of the screw vine connected to the propulsion machine, and a partition wall with a central opening and an inner wall converging toward the opening are provided at the inner rear. By rotating the Yukatsuta with a screw auger or other prime mover, the earth and sand on the front of the cutting edge body is collected in the center and sent to the rear. A girder with a rectangular cross-section that can be reliably excavated to every corner without causing any damage, and the excavated soil can be guided backwards without stagnation. can be buried easily and smoothly,
The number of rectangular girders required to be buried is correspondingly reduced, and material costs and construction time can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cutting edge body according to the present invention. Figure 2 is its front view. Figure 3 is a cross-sectional view of the screw auger and concrete girder installed. Figures 4A and 4B are perspective views of the short axis and intermediate axis, respectively. FIG. 5 is a front view of an underground structure constructed using the cutting edge body of the present invention. Figure 6A is a side view of a concrete girder press-fitted using a conventional cutting pipe. Figure B is its front view. In the figure, 1...Blade body, 2...Gearbox, 2
a... Sword tip, 3, 3', 4, 4'... Screw cutter, 3a, 3a', 4a, 4a'... Heart axis, 3b,
3b', 4b, 4b'... spiral blade, 3c, 3c',
4c, 4c'... Pit, 5... Short shaft, 7... Intermediate shaft, 8... Worm wheel, 10... Worm, 11... Partition wall, 11a... Opening, 12...
Internal wall, 13...screw auger, 15...concrete girder.

Claims (1)

[Claims] 1 A screw auger is connected to a propulsion machine with a screw cutter with helical blades in different directions on the left and right sides so that the excavated soil is concentrated in the center of the inside front of a box-like body that is rectangular and open at the front and back. The box-shaped body is constructed so as to be rotatable perpendicular to the axis, and a partition wall having a central opening and an inner wall converging toward the opening are provided at the inner rear part of the box-like body, and the screw cutter is connected to a screw auger or other prime mover. A cutter mouth body for burying a rectangular girder, characterized in that it is rotated to excavate earth and sand in front.