JP7044742B2 - Support for preventing slippage of the laying box and support method for preventing slippage of the laying box - Google Patents

Description

The present invention relates to a laying box connection support and a laying box connection support method for preventing joint misalignment of concrete box joints used for constructing underground structures such as water and sewage systems and underground passages in urban areas. ..

The following patent documents are provided as those capable of preventing the joints of a plurality of concrete boxes embedded by being connected to each other in a rear row from being displaced and preventing the core from being displaced.
Japanese Patent No. 2878254

This is a process of arranging propulsion jacks inside the left and right side wall plates and excavating and discharging the earth and sand in front of the front or top opening of the open shield machine that opens the front, rear and top surfaces, and extending the propulsion jack to concrete. The process of moving the shield machine forward by using the box as a reaction force and the process of suspending and setting a new concrete box from above behind the propulsion jack that has been shrunk in the tail of the shield machine are repeated as appropriate to sequentially concrete. In the open shield method in which the boxes are connected in columns and buried, a plate-shaped body is applied to the opposite points inside the joint part of the concrete box body, and a stretchable rod-shaped body is laid between the plate-shaped bodies, and the front and rear concrete. The rod-shaped body presses the plate-shaped body against the joint portion so that the boxes do not shift from each other.

As shown in FIGS. 13, 14, and 15, the plate-shaped body 14 is applied to the concrete box 4 at appropriate intervals above and below the left side plate 4a and the right side plate 4b inside the concrete box 4, while the concrete box 4 A strut 11 is arranged between the upper floor plate 4c and the lower floor plate 4d, and a receiving member 12 is projected up and down on the side portion of the strut 11 at appropriate intervals, for example, and is a rod-shaped body on the receiving member 12. The beam member 13 is installed horizontally, and the end portion of the beam member 13 abuts on the plate-shaped body 14.

For both the beam member 13 and the support column 11, for example, the inner pipe is slidably combined in the outer pipe, and the overlapping portion is formed in the screw portion so that the length can be adjusted. Then, in the case of the support column 11, both ends are pressed against the upper floor plate 4c and the lower floor plate 4d of the concrete box 4 by adjusting the length with the screw portion, and both ends are firmly erected, and the beam is also erected. Similarly, the length of the member 13 is adjusted by the screw portion, and the end portion is pressed against the plate-shaped body 14 attached to the left side plate 4a and the right side plate 4b of the concrete box body 4.

The joint portion of the front and rear concrete boxes 4 is integrally fixed by the pressing force of the beam member 13 against the plate-shaped body 14. Therefore, even if the open shield machine 1 corrects the digging direction, it is possible to prevent the concrete boxes 4 connected in the front and rear columns from being displaced from each other in the left-right direction at the joint portion.

In the case of Patent Document 1, a pipe support or a hydraulic jack is usually used to prevent the concrete box (box culvert) from slipping, and both side walls or the top plate are fixed by stretching the both side walls or the top plate. Since it is stretched, it can be expected to have a slip prevention effect in only one direction, left or right or up and down, within the same cross section.

An object of the present invention is to eliminate the inconvenience of the above-mentioned conventional example, and by restraining either the left or right or the top and bottom with the support for restraint and the support in the other direction, the box can be restrained in two directions on the completely same cross section. It is an object of the present invention to provide a support for connecting a laying box and a support method for connecting a laying box.

In order to achieve the above object, the present invention according to claim 1 is a concrete box used for constructing an underground structure such as an underpass, and when the concrete boxes are arranged in columns, the joint portion of the concrete box is displaced. It is a support for bearing pressure to prevent, and the concrete box body is straddled over the joint of the concrete box body to connect the bearing part having an inclination according to the haunch shape inside the concrete box body to the end of the rod-shaped bearing support support. A concrete box of a rod-shaped support that is slidably arranged on the inner four corners of the haunch and along the angle of inclination of the haunch shape in the circumferential direction of the concrete box , and the bearing is arranged at the end. A second support for restraint in the pressing direction orthogonal to the pressing direction in the vertical direction along the inner surface of the side wall of the cross section or in the horizontal direction along the inner surface of the top plate of the cross section, the bearing portions arranged side by side or vertically. The purpose is to intervene between them.

According to the first aspect of the present invention, by restraining either the left or right or the top and bottom with the second support for restraint, it is possible to restrain the box in two directions on the completely same cross section.

Further, since the pressure bearing portion has an inclination, a sufficient pressure receiving area is secured for the haunch portion and the box body can be restrained, so that the possibility of damage to the box body is low.

Furthermore, by making the bearing part slidable, after installing the support in one direction, when extending the support in the other direction, the bearing part can slide, so that the haunch part of the box can be used. Since no frictional force is generated and only bearing pressure is generated, it is possible to prevent damage to the box and effectively restrain it.

The gist of the present invention according to claim 2 is that a split portion that can be bolted is provided in the intermediate portion of the support, and the dimensions of the intermediate member can be changed by adding a member between the split portions. ..

According to the second aspect of the present invention, the dimensions of the support can be easily changed by adding an intermediate member.

In addition, according to the box cross-section standard, by adding intermediate members, it is possible to handle various cross-sections of the box with the same support member.

The gist of the present invention according to claim 3 is that a jack structure is provided in the intermediate portion of the support so that the invention can be expanded and contracted.

According to the third aspect of the present invention, similarly to the second aspect, the dimensions of the support can be easily changed by forming a jack structure in the intermediate portion of the support.

In addition, by expanding and contracting the jack structure according to the box cross-section standard, it is possible to handle various cross-sections of the box with the same support member.

According to the fourth aspect of the present invention, the bearing portion inclined according to the shape of the haunch formed at the four corners of the concrete box so as to straddle the joints of the concrete boxes connected in columns inside the laid concrete box. Is arranged on the haunch of the concrete box, and a first rod shape is formed between the bearing portions arranged in the left-right direction along the inner surface of the top slab of the cross section of the concrete box or in the vertical direction along the inner surface of the side wall of the cross section of the concrete box. A second support whose pressing direction is orthogonal to the pressing direction of the first rod-shaped support is interposed between the left and right or vertically arranged bearing portions that are not supported by the first support. By restraining the first and second supports with each other, it is possible to restrain the concrete box in both the left, right, up and down directions on the same cross section of the joints of the concrete boxes.

According to the fourth aspect of the present invention, similarly to the first aspect, by restraining either the left or right or the top and bottom with the second support for restraint, the box is restrained in two directions on the completely same cross section. Is possible.

As described above, the laying box body connection support and the laying box body connection support method of the present invention can easily, quickly, and surely prevent the displacement between the box body and the box body when the box body is installed, and are left and right. By restraining either the upper or lower side with the support for restraint and the support in the other direction, it is possible to restrain the box body in two directions on the completely same cross section.

It is a vertical sectional front view which shows 1st Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a cross-sectional plan view which shows 1st Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a vertical sectional side view which shows 1st Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a vertical sectional front view of the main part which shows 1st Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a vertical sectional front view which shows the 2nd Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a cross-sectional plan view which shows the 2nd Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a vertical sectional side view which shows the 2nd Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a vertical sectional front view of the main part which shows the 2nd Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a vertical sectional front view which shows the 3rd Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a cross-sectional plan view which shows the 3rd Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a vertical sectional side view which shows the 3rd Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a vertical sectional front view of the main part which shows the 3rd Embodiment of the support for connecting a laying box body and the support method for connecting a laying box body of this invention. It is a vertical sectional side view which shows the conventional example. It is a vertical sectional front view which shows the conventional example. It is explanatory drawing of the use in the open shield method which shows the conventional example.

Hereinafter, embodiments of the present invention will be described in detail with respect to the drawings. FIG. 1 is a vertical sectional front view showing a first embodiment of the laying box body connection support and the laying box body connection support method of the present invention, FIG. 2 is a sectional plan view of the same as above, and FIG. 3 is a vertical sectional side view of the same as above. Is a laid concrete box used for constructing underground structures such as lower roads, which consists of a left side plate 4a, a right side plate 4b, an upper floor plate 4c, and a lower floor plate 4d, and the front and rear surfaces are opened as openings. ing.

Further, the concrete box 4 is formed as an inclined haunch 4f at the four corners of the inside, top, bottom, left and right.

In the present invention, the haunch 4f inside the concrete box 4f is uniformly supported on the line of the joint joint portion of the concrete box 4, and has an inclination according to the shape of the haunch 4f inside the concrete box 4. The bearing portion 16 was arranged at the end of the bearing support 17.

The bearing support 17 is a jack-type rod -shaped telescopic support using water pressure, hydraulic pressure, or pneumatic pressure, and the bearing portion 16 is formed as an integral structure at the end of the bearing support 17.

The bearing support 17 is a concrete box used for constructing an underground structure such as an underground passage, and is used to prevent joint misalignment of the joint portion of the concrete boxes when the concrete boxes are lined up in columns.

Further, the pressure bearing portion 16 is installed so as to straddle the mutual joints of the concrete boxes 4 to be connected, and is slidably arranged with respect to the concrete box according to the angle of inclination of the haunch shape.

In order to make it slidable, it is slid with respect to the haunch 4f along the inclination angle of the haunch shape, and it may be slid by directly contacting the surface of the haunch 4f, but in the illustrated example, the channel is pressed. A plate 16a was interposed.

The channel pressing plate 16a may or may not be fixed to the haunch 4f.

Further, the bearing support 17 is provided with a split portion 18 that can be bolted to the intermediate portion, and the dimensions can be changed by adding the intermediate member 19 between the split portions 18.

In the figure, 20 is between the left and right or upper and lower bearing portions 16 in the vertical direction along the inner surface of the side wall of the concrete box cross section of the bearing support 17, or the lateral pressing direction along the inner surface of the top plate of the cross section. It is a second support for restraint arranged in orthogonal pressing directions, and a general-purpose screw jack type support having no angle on the bearing surface can be used for this.

In addition to the normal support, a jack-type telescopic support using water pressure, hydraulic pressure, or pneumatic pressure may be used for the second support 20 for restraint.

5 to 8 show a second embodiment of the present invention, in which the bearing support 17 is a screw jack type support or a strong support. The screw jack type support and strong support consist of a lower pillar with a base plate at the lower end and an upper pillar with a receiving plate at the upper end. Adjust the length to be inserted into the lower pillar of the upper pillar with this female screw to make the whole as a tension rod, and insert a pin into the stop bolt to fix it.

When the support 17 for bearing pressure is a screw jack type support in this way, the jack structure 21 is provided in the middle part of the support, so that the support can be expanded and contracted, and the dimension of the support is the jack structure 21 in the middle part of the support. You can easily change it with.

Further, FIGS. 9 to 12 show a third embodiment of the present invention, in which the bearing portion 16 is not formed as an integral structure at the end of the bearing support 17, but is a separate block body. It was made possible to fix it to the end of the bearing support 17 with a bolt or the like.

Also in the case of this third embodiment, the second support 20 for restraint is only brought into contact with the bearing portion 16 and does not need to be connected by a bolt or the like.

Next, the usage will be described. As a conventional example, it is the same as described with reference to FIG. 15, and in the open shield method using the support of the present invention, the front surface, the rear surface, and the upper surface composed of the left and right side wall plates 1a and the bottom plate 1b connected to these side wall plates 1a. The open shield machine 1 which is a shield machine with an opening is used.

The open shield machine 1 is formed with the tips of the side wall plate 1a and the bottom plate 1b as blade edges, and the propulsion jacks 2 are arranged vertically side by side toward the rear near the center or the rear end of the side wall plate 1a.

Although not shown, the open shield machine 1 is installed in the starting pit, the propulsion jack 2 of the open shield machine 1 is extended, and the reaction force is applied to the reaction force wall in the starting pit to move the shield machine 1 forward. The first concrete box 4 forming the underground structure is suspended from above and set behind the contracted propulsion jack 2 in the tail portion 1c of the shield machine 1. A strut is arranged between the propulsion jack 2 and the reaction force wall, and the distance is adjusted as appropriate.

In addition, the starting pit is composed of a retaining wall, and in order to start the open shield machine 1, this retaining wall is partially mirror-cut, but if necessary, the ground is improved in the front part of the starting pit by injecting chemicals or the like. Sometimes I leave it.

Excavators such as excavators excavate and remove earth and sand from the front surface or the upper surface of the open shield machine 1. At the same time as or after this soil removal step, the propulsion jack 2 is extended to advance the open shield machine 1. In the case of this advancing step, a push angle made of a frame made of box steel or structural steel is arranged in front of the concrete box 4.

Then, the second concrete box 4 is suspended in the tail portion 1c of the open shield machine 1 in front of the first concrete box 4. Hereinafter, the same soil removal process, advancing process, and setting process of the concrete box 4 are repeated as appropriate, and the concrete box 4 is sequentially left in the ground in parallel as the open shield machine 1 advances, and further, the concrete box 4 is left in the ground. Backfilling is performed on the upper surface of 4.

In this way, when the open shield machine 1 reaches the reaching pit, it is removed and the construction is completed.

When connecting the concrete box 4, fix it with a support and remove it when it is no longer needed.

When the open shield machine 1 reaches the reaching pit, remove it and complete the construction.

For fixing with the support, a bearing portion 16 inclined according to the shape of the haunch is arranged so as to straddle each other of the boxes 4 connected to the haunch 4f inside the laid concrete box 4, and the bearing portions are separated from each other. A second support 20 for restraint is interposed between the left and right or upper and lower bearing portions 16 in a direction orthogonal to the pressing direction of the bearing support 17 while bearing the pressure by the bearing support 17 which is the support of 1.

In this way, inside the laid concrete box 4, the bearing pressure inclined according to the shape of the haunch 4f formed at the four corners of the concrete box 4 so as to straddle the mutual joints of the concrete boxes 4 connected in columns. The portions 16 are arranged on the haunch of a concrete box, and the bearing portions 16 arranged on the left and right or vertically are supported by the first support, and the bearing portions 16 are not supported by the first support. A second support whose pressing direction is orthogonal to the pressing direction of the first support is interposed between the portions 16, and the first and second supports are constrained to each other so that the joints of the concrete boxes can be joined to each other. It is possible to restrain the concrete box in both the left, right, up and down directions on the same cross section.

Since the second support 20 is for restraint and does not require bearing pressure, it is arranged after the bearing portion 16 is pressed by the bearing support 17 to fix the concrete boxes 4 to each other. do it.

By restraining the first and second supports with each other in this way, it is possible to restrain the first and second supports in both the left, right, up, and down directions on the same cross section.

The support dimensions can be changed by providing a split portion 18 that can be bolted to the support intermediate portion and adding a member between the split portions 18 or by providing a jack structure in the support intermediate portion. It becomes possible and can correspond to various box cross sections.

1 ... Open shield machine 1a ... Side wall plate 1b ... Bottom plate 1c ... Tail part 2 ... Propulsion jack 4 ... Concrete box 4a ... Left side plate 4b ... Right side plate 4c ... Upper floor plate 4d ... Lower floor plate 4f ... Haunch 11 ... Support 12 ... Member 13 ... Beam member 14 ... Plate-shaped body 16 ... Supporting part 16a ... Channel pressing plate 17 ... Support for bearing 18 ... Dividing part 19 ... Intermediate member 20 ... Second support for restraint 21 ... Jack structure

Claims (4)

A concrete box used for constructing underground structures such as underpasses. It is a support for bearing pressure that prevents joint misalignment of the joints of concrete boxes when the concrete boxes are lined up in columns. For the haunch formed at the four corners inside the concrete box so as to straddle the joint of the concrete box connecting the bearing part having the inclination according to the shape of the haunch inside the concrete box at the end, and at the angle of inclination of the haunch shape. A vertical or top plate of the cross section of the concrete box of the concrete box of the rod-shaped support that is slidably arranged along the circumferential direction of the concrete box and has the bearing portion arranged at the end. A displacement of the laying box characterized by interposing a second support for restraint in the pressing direction orthogonal to the pressing direction in the left-right direction along the inner surface between the bearing portions arranged side by side or vertically. Support for stopping . The support for preventing slippage of the laying box according to claim 1, wherein a split portion that can be bolted is provided in the intermediate portion of the support, and the dimensions can be changed by adding an intermediate member between the split portions. The support for preventing slippage of the laying box according to claim 1 or 2, wherein a jack structure is provided in the middle portion of the support so that it can be expanded and contracted. Inside the laid concrete box, the bearings that are inclined according to the shape of the haunch formed at the four corners of the concrete box are arranged on the haunch of the concrete box so as to straddle the joints of the concrete boxes connected in columns. The first rod-shaped support is used to support between the bearing portions arranged in the left-right direction along the inner surface of the top slab of the concrete box cross section or in the vertical direction along the inner surface of the side wall of the concrete box cross section . The first and second supports are provided by interposing a second support whose pressing direction is orthogonal to the pressing direction of the first rod-shaped support between the left and right or vertically arranged bearing portions that are not supported by the support. A slip-prevention support method for laying concrete boxes, which is characterized by being able to restrain the concrete boxes in both the left, right, up, and down directions on the same cross section of the joints of the concrete boxes by restraining each other.

Images