JP7093930B2 - Main push jack equipment in the box propulsion method and the box propulsion method using it - Google Patents

Description

The present invention relates to a main push jack facility in a box propulsion method for burying an underground structure such as a tunnel under a track or across a road, and a box propulsion method using the same.

Conventionally, when constructing an underground structure such as a tunnel under a track or across a road, a roof protector in which square steel pipes are arranged in parallel is first buried by penetrating it in the ground under the track or under the road. The roof protector receives the track load and road load, and the box of the underground structure is propulsion and buried along the lower surface of the roof protector, or the roof protector is extruded and replaced with the box to propel and bury the box. , A non-excavation method under-route crossing structure construction method that does not obstruct the flow of running trains and vehicles is being carried out.

There are various construction methods for constructing under-track crossing structures by non-excavation method. Among them, the box body thrusting method, which is one of the typical non-cutting methods along with the element propulsion and traction method, can be constructed with a small soil cover under the track in service, and has many applications so far. ..

This construction method is also described in Patent Document 1 below, but as shown in FIG. 24, it is aligned with the outer edge of the concrete box 9 of the main structure in the direction perpendicular to the track, and is used for upper traffic 1 such as railways and protection of excavated face. A rectangular steel pipe (box-shaped roof 6), which is a steel element, is installed, and the box body is propelled along with face excavation to push the steel element to the reaching side while replacing the box body of the main structure. be.
Japanese Patent Application Laid-Open No. 55-19312

A retaining steel sheet pile 2 is placed beside the upper traffic 1 of a railroad or the like to construct a starting shaft 3 and a reaching shaft 4, and a propulsion machine (not shown) is installed in the starting shaft 3 to form a box. The shape roof 6 is press-fitted toward the reaching shaft 4.

An underground structure with a reaction force wall 8 and a concrete box body 9 is set in the starting shaft 3, a push jack 10 is provided between the reaction force wall 8 and the concrete box body 9, and the tip of the concrete box body 9 is provided. The cutting edge 11 is provided.

If the inside of the cutting edge 11 is excavated, a small jack (not shown) is extended, the concrete box 9 is used as a reaction force, and the box-shaped roofs 6 are pushed forward one by one. The small jack is shrunk, and this time the push jack 10 is extended to dig up the concrete box 9.

In the figure, 16 indicates a strut interposed between the main push jack 10 and the concrete box 9, and 21 indicates a spacer.

In this way, the box-shaped roof 6 protruding from the reaching shaft 4 is sequentially removed while alternately repeating the forward movement of the box-shaped roof 6 and the forward movement of the concrete box body 9.

Then, when the tip of the concrete box 9 reaches the reaching shaft 4, the cutting edge 11 and the like are removed, and the backfill grout is performed as appropriate to complete the construction.

In the case of under-track crossing tunnel construction by the non-cutting method, the work time is short and the daily advance amount is limited because the box body is propelled within the train interval or the track closing time.

In the box body propulsion method, it is necessary to install the reaction force material (spacer 21, strut 16) after the propulsion by the main push jack 10, and it takes a lot of time to install. Therefore, the box cannot be continuously propelled.

An object of the present invention is to solve the above-mentioned inconvenience of the conventional example and to provide a main push jack facility in a box propulsion method capable of sequentially propulsion in a short time and a box propulsion method using the same.

In order to achieve the above object, in the present invention according to claim 1, in a starting shaft for propelling a concrete box, a plurality of front and rear push jack mounts in which the main push jacks are housed in a rack stand are installed side by side behind the concrete box. However, the gist is that the original push jacks of the jack mounts are connected to each other.

According to the first aspect of the present invention, by additionally installing a main push jack mount and connecting each main push jack, a double stroke can be obtained and propulsion can be sequentially performed. By reducing the number of spacers (spacers, struts), continuous box propulsion becomes possible in a short time.

Since the main push jack stand can be additionally installed and the propulsion can be performed sequentially, continuous box propulsion can be performed in a short time.

The gist of the present invention according to claim 2 is that the main push jack mount can be suspended in a starting shaft.

According to the second aspect of the present invention, the main push jack mount can be easily positioned by suspending it in the starting shaft, and the rack itself can be placed in an appropriate position to easily connect the main push jacks to each other. It can be done quickly.

The gist of the present invention according to claim 3 is that, of the main push jack mounts installed side by side in the front and rear, the main push jack mount on the concrete box side is provided with a chill tank at the lower part and is movable back and forth.

According to the third aspect of the present invention, among the original push jack pedestals installed side by side in the front and rear, the main push jack pedestal on the concrete box side is provided with a chill tank at the lower part and is movable back and forth. Can be reduced.

The gist of the present invention according to claim 4 is to arrange a bearing plate between the main push jacks.

According to the fourth aspect of the present invention, it is possible to eliminate the concern of buckling of the jack cylinder due to the shaft misalignment of the jack mount by the pressure supporting plate.

The gist of the present invention according to claim 5 is to install guide steel materials by chill tanks on both sides of a jack stand.

According to the fifth aspect of the present invention, the influence of the misalignment of the jack mount can be reduced by installing the guide steel material by the chill tank on both sides of the mobile jack mount.

According to the sixth aspect of the present invention, in a starting shaft for propelling a concrete box, a plurality of front and rear jack jacks in which the main push jacks are housed in a rack stand are installed behind the concrete box, and the jack mounts are mutually installed. Using the main push jack equipment in the box propulsion method in which the main push jacks are connected, the front push jack pedestal and the concrete box are propelled by the main push jack of the rear main push jack pedestal when viewed from the concrete box. Next, the gist is to propel the concrete box with the front push jack pedestal and the rear push jack pedestal as a reaction force.

According to the sixth aspect of the present invention, it is possible to double the amount of propulsion per day and improve the productivity of box propulsion by the double jacks connected in two in the propulsion direction.

As described above, the main push jack equipment in the box body propulsion method of the present invention can be sequentially propelled in a short time.

It is a top view which shows one Embodiment of the main push jack equipment in the box body propulsion method of this invention. It is a front view which shows one Embodiment of the main push jack equipment in the box body propulsion method of this invention. It is a side view which shows one Embodiment of the main push jack equipment in the box body propulsion method of this invention. It is a front view which shows the installation of a jack. It is explanatory drawing of the 1st to 4th steps of the box body propulsion method using the main push jack equipment in the box body propulsion method of this invention. It is explanatory drawing of the 5th to 8th steps of the box body propulsion method using the main push jack equipment in the box body propulsion method of this invention. It is explanatory drawing of the 9th to 12th steps of the box body propulsion method using the main push jack equipment in the box body propulsion method of this invention. It is explanatory drawing of the 13th to 16th steps of the box body propulsion method using the main push jack equipment in the box body propulsion method of this invention of this invention. It is explanatory drawing of the 17th to 20th steps of the box body propulsion method using the main push jack equipment in the box body propulsion method of this invention. It is explanatory drawing of the 21st to 24th steps of the box body propulsion method using the main push jack equipment in the box body propulsion method of this invention. It is explanatory drawing of the 25th to 28th steps of the box body propulsion method using the main push jack equipment in the box body propulsion method of this invention. It is explanatory drawing of the 29th to 32nd steps of the box body propulsion method using the main push jack equipment in the box body propulsion method of this invention. It is explanatory drawing of the 33rd-36th steps of the box body propulsion method using the main push jack equipment in the box body propulsion method of this invention. It is explanatory drawing which shows the comparison between the box body propulsion method using the main push jack equipment in the box body propulsion method of this invention, and the conventional example. It is a front view which shows the installation of the guide steel material by a chill tank. It is a top view which shows the installation of the guide steel material by a chill tank. It is a vertical sectional side view of the first step of the SFT construction method (Simple and Face-Less Method of Construction of Tunnel) as a construction method of an underground structure. It is a vertical sectional side view of the 2nd process of the SFT method. It is a vertical sectional side view of the 3rd process of the SFT method. It is a vertical sectional side view of the 4th process of the SFT method. It is a vertical sectional side view of the 5th process of the SFT method. It is a front view of a box-shaped roof. It is a front view which shows the arrangement state of a box-shaped roof. It is a perspective view which shows the outline of the propulsion method.

Hereinafter, embodiments of the present invention will be described in detail with respect to the drawings. FIG. 1 is a plan view showing one embodiment of a main push jack facility in the box body propulsion method of the present invention, FIG. 2 is a front view of the same as above, FIG. 3 is a side view of the same as above, and FIG. It is a starting shaft formed in the above.

A reaction force wall 8 made of reinforced concrete is provided at the innermost part of the starting shaft 3 for propelling the concrete box body, and a well girder frame 22 made of steel is installed in front of the reaction force wall 8.

In the present invention, a plurality of original push jack mounts 23 and 29 are installed side by side.

The push jack mounts 23 and 29 are made by horizontally housing the push jack 10 in a rack stand 24 made of H-shaped steel or the like in the front-rear direction, and as shown in FIG. 4, the cylinder portion of the push jack 10 is housed. It is fixed to the rack stand 24 by welding. If it is not welded, a holder may be provided or it may be fixed with a band stopper.

These main push jack pedestals 23 and 29 are framed on the ground, and after the main push jack 10 is attached, the rack pedestal 24 can be suspended in the starting shaft 3 by a crane or the like.

The main push jack pedestal 23 to be installed on the back side of the starting shaft 3 (opposite to the propulsion side of the concrete box 9) is fixedly provided by connecting the rack pedestal 24 and the well girder frame 22 with a connecting material 25 or the like.

On the other hand, the main push jack pedestal 29 installed on the front side (concrete box 9 side) is provided with a chill tank 30 at the lower part and is movable back and forth. Correspondingly, a rail 31 was laid at the bottom of the starting shaft 3 by burying an H-shaped steel material in the foundation concrete so that its flange surface was exposed.

The original push jack pedestals 23 and 29 installed side by side in the starting shaft 3 are connected to each other so that the original push jacks 10 of the jack pedestals 23 and 29 are lined up at the same center, and the original push jacks 10 are connected to each other. Propulsion allows them to interact.

Although not shown, a pressure bearing plate is arranged between the main push jacks 10.

This bearing plate is a thick steel rectangular plate, and is attached to, for example, the end of the jack cylinder of the push jack 10.

By providing such a bearing plate, it is possible to eliminate the concern about buckling of the jack cylinder due to the misalignment of the jack stand.

A guide frame wall 26 protruding from the wall of the starting shaft 3 is formed on the side where the main push jack pedestal 29 to be installed on the front side is located, and the main push jack equipment 29 is housed in the left and right guide frame walls 26. I tried not to tilt it too much.

As shown in FIGS. 15 and 16, the guide frame wall 26 can be configured as a guide steel material 32 using a chill tank. The guide steel material is a framework of H330 steel, and the chill tank (roller) is arranged outward on the flange surface of the sideways steel material.

By installing the guide steel material 32 by the chill tank on both sides of the mobile jack pedestal 29, the influence of the misalignment of the jack pedestal 29 can be reduced.

In the construction method of the present invention, in a starting shaft for propelling a concrete box, a plurality of original push jacks with the original push jacks housed in a rack frame are installed side by side behind the concrete box, and the original push jacks for each of the jack mounts are installed. Using the main push jack equipment in the articulated box propulsion method, the front main push jack pedestal and the concrete box are propelled by the main push jack of the rear main push jack pedestal when viewed from the concrete box, and then the front. This is the original push jack of the original push jack pedestal, and the rear original push jack pedestal is used as a reaction force to propel the concrete box.

Next, the SFT method will be described as one of the box body propulsion methods using the main push jack mounts 23 and 29.

This construction method (Simple and Face-Less Method of Construction of Tunnel) was named the SFT construction method as an abbreviation for "a simple and face-less tunnel construction method".

Explaining based on the process diagrams of FIGS. 17 to 21, as the first process, as shown in FIG. 17, the earth retaining steel sheet pile 2 is placed beside the upper traffic (not shown) such as a railroad, and the starting shaft is started. 3 and the reaching shaft 4 are constructed, and a propulsion device 5 is installed in the starting shaft 3 so that the box-shaped roof 6 which is a roof cylinder is press-fitted toward the reaching shaft 4. A friction cutter plate 7 is attached to the upper surface of the box-shaped roof 6 and extruded together with the box-shaped roof 6.

In this case, the box-shaped roof 6 is arranged in a square shape so as to correspond to the outer shape of the concrete box 9 to be propelled as shown in FIG. 23, and the retaining member is attached to the face portion surrounded by the box-shaped roof 6. 19 is arranged.

FIG. 22 is a front view of the box-shaped roof 6, which is a box-shaped cylinder having a substantially square cross section, and hook-shaped or flat plate-shaped joints 6a and 6b are continuously formed on the side surfaces in the longitudinal direction, and on the upper surface thereof. A friction cutter plate 7 made of a flat plate is attached. The box-shaped roofs 6 can be sequentially connected in the length direction to embed the required length, and are further arranged in parallel in the vertical and horizontal directions via the joints 6a and 6b.

In the figure 17, the abdominal raising material, the retaining steel sheet pile 2 on the starting shaft 3 side, and the retaining steel sheet pile 2 on the reaching shaft 4 side are fixed by a tie lot material 18. 20 indicates a starting platform.

As shown in FIG. 18, the box-shaped roof 6 is penetrated between the starting shaft 3 and the reaching shaft 4 and arranged in a square shape so as to correspond to the outer shape of the concrete box 9 to be propelled as shown in FIG. However, the earth retaining member 19 is arranged on the face portion surrounded by the box-shaped roof 6.

Next, as shown in FIG. 19 of the third step, the concrete box 9 is installed in the starting shaft 3, and the main push jack 10 and the strut 16 are installed as propulsion equipment between the concrete box 9 and the reaction force wall 8 behind the concrete box 9. Arrange.

Then, the friction cutter plate 7 is fixed to the starting shaft 3 side by the stopping member 14. The friction cutter plate 7 cuts the edges between the box-shaped roof 6 and the concrete box 9 and the surrounding earth and sand.

Next, the tip of the concrete box 9 is joined or brought into contact with the rear end of the box-shaped roof 6 extruded in advance, and as a fourth step, the push jack 10 is extended and concrete is extended as shown in FIG. Extrude the box 9 forward.

The box-shaped roof 6 is also extruded at the same time as the concrete box 9 is extruded, and the face portion is not excavated. By extruding, the earth and sand in front of it are also extruded at the same time. In this case, since the friction cutter plate 7 cuts the edges between the box-shaped roof 6 and the concrete box 9 and the surrounding earth and sand as described above, the box-shaped roof 6 and the concrete box 9 are smoothly propelled.

In this way, as a fourth step, as shown in FIG. 20, when the box-shaped roof 6 and the earth and sand surrounded by the box-shaped roof 6 and extruded at the same time reach the reaching shaft 4, the box-shaped roof is reached in the reaching shaft 4. At the same time as removing 6, the earth and sand are excavated and discharged.

Then, the concrete box 9 is further propelled until the tip of the concrete box 9 reaches the reaching shaft 4, and the promotion of the entire length of the concrete box 9 is completed.

Next, the construction steps of the box body propulsion method using the main push jack equipment in the box body propulsion method of the present invention in the propulsion method such as the SFT method will be described.

FIG. 5 shows the first to fourth steps. As the first step, the concrete box 9 is built in the starting shaft 3 as shown in FIG. 17, and the grid frame 22 is used as a reaction force wall as the second step. Installed in front of 8, the first-stage original push jack pedestal 23 is installed in front of it as the third process, and the concrete box 9 is installed in front of it as the fourth step using the original push jack 10 of the original push jack pedestal 23. Press empty.

FIG. 6 shows the fifth to eighth steps. As the fifth step, the main push jack 10 of the main push jack pedestal 23 is retracted, the spacer 21 is interposed behind the concrete box 9, and the box-shaped roof 6 is formed. A push angle 27 is installed behind, and the box-shaped roof 6 and the concrete box 9 are joined with the push angle 27 interposed therebetween.

As the sixth step, the friction cutter plate 7 is laid on the concrete box 9, and the friction cutter plate control device 28 is attached to the friction cutter plate 7. As the seventh step, the friction cutter plate control device 28 of the friction cutter plate 7 is operated, and as the eighth step, the concrete box 9 is propelled. The friction cutter plate control device 28 pulls back the friction cutter plate 7.

FIG. 7 shows the 9th to 12th steps. As the 9th step, the spacer 21 (2 out of 3) was removed, and after the spacer 21 was vacated, the chill tank 30 was attached to the lower side of the second stage. The push jack stand 29 is suspended and installed. The second-stage push jack mount 29 is movable along the rail 31.

As the tenth step, the second-stage original push jack pedestal 29, the concrete box 9 and the box-shaped roof 6 are propelled by the original push jack 10 of the first-stage original push jack pedestal 23, and at the same time, the box-shaped roof 6 is used. It also extrudes the enclosed earth and sand.

As the eleventh step, while the original push jack 10 of the first-stage original push jack pedestal 23 is extended as it is, the concrete box 9 and the box shape are formed by the original push jack 10 of the second-stage original push jack pedestal 29. The roof 6 is further propelled, the spacer 21 remaining in the twelfth step is lifted and removed, and the second-stage push jack pedestal 29 is retracted.

FIG. 8 shows the thirteenth to sixteenth steps. As the thirteenth step, the first-stage original push jack pedestal 23 is retracted, and the second-stage original push jack pedestal 29 is used with a lever block (registered trademark). Move to the front push jack equipment 23 side of the first stage.

As the 14th step, the strut 16 is assembled, and as the 15th step, the main push jack pedestal 29, the concrete box 9 and the box-shaped roof 6 of the second stage are assembled by the main push jack 10 of the first push jack pedestal 23. It is further propelled, and as the 16th step, it is further propelled by the main push jack 10 of the main push jack pedestal 29 in the second stage.

FIG. 9 shows the 17th to 20th steps. As the 17th step, the second unit of the strut 16 is assembled, and as the 18th step, the concrete box body is formed by the push jack 10 of the push jack mount 23 of the first step. 9 and the box-shaped roof 6 are propelled, and further propelled by the second-stage push jack equipment 23 as the 19th step. As the 20th step, the third strut 16 is assembled.

FIG. 10 shows the 21st to 24th steps, and as the 21st step, the first-stage original push jack pedestal 23 and the second-stage original push jack pedestal 29 together with the concrete box 9 and the original push jack pedestal 23 are shown. The box-shaped roof 6 is propelled, and the concrete box 9 and the box-shaped roof 6 are propelled by the push jack 10 of the second-stage push jack pedestal 29 as the 22nd step, and on the upper part of the strut 16 as the 21st step. A scaffolding / safety handrail (not shown) is installed, and as the 23rd step, it is further propelled by the main push jack 10 of the main push jack pedestal 29 in the second stage. As the 24th step, the fourth strut 16 is installed.

FIG. 11 shows the 25th to 28th steps, and as the 25th step, the first-stage original push jack pedestal 23 and the second-stage original push jack pedestal 29 together with the concrete box 9 and the original push jack pedestal 23 are shown. The box-shaped roof 6 is propelled, and as the 26th step, the concrete box 9 and the box-shaped roof 6 are propelled by the main push jack 10 of the second-stage push jack mount 29. As the 27th step, the fifth strut 16 is installed. As the 28th step, the concrete box 9 and the box-shaped roof 6 are propelled together with the second-stage original push jack pedestal 29 by the original push jack 10 of the first-stage original push jack pedestal 23.

FIG. 12 shows the 29th to 32nd steps. As the 29th step, the concrete box 9 and the box-shaped roof 6 are propelled by the push jack 10 of the push jack mount 29 of the second stage, and the 30th step. The sixth unit of the strut 16 will be installed. As the 31st step, the concrete box 9 and the box-shaped roof 6 are propelled together with the 2nd stage main push jack stand 29 by the 1st stage main push jack stand 23, and the 2nd stage main push as the 32nd step. The concrete box 9 and the box-shaped roof 6 are propelled by the jack stand 29.

FIG. 13 shows the 33rd to 36th steps. As the 33rd step, the main push jack 10 of the main push jack pedestal 23 of the second stage is retracted, one spacer 21 is put in, and the concrete box 9 and the concrete box 9 and Propulsion of the box-shaped roof 6. As the 34th step, the original push jack 10 of the first-stage original push jack pedestal 23 is retracted, the second-stage original push jack pedestal 29 is also retracted, and four push angles 27 and struts 16 are set in the starting shaft 3. Remove it by weighting it upwards.

As the 35th step, the friction cutter plate control device 28 is removed, the friction cutter plate is cut, and as the 36th step, the earth and sand in the box-shaped roof 6 is excavated and removed, and the box-shaped roof 6 is removed.

FIG. 14 is an explanatory diagram showing a comparison between the box propulsion method using the main push jack equipment and the conventional example in the box propulsion method of the present invention, showing the conventional method on the left and the method of the present invention (double jack) on the right. ..

In the conventional method, the one-time propulsion length is 940 mm and the strut 16 is also 940 mm, but in the present invention method, the one-time propulsion length is the propulsion length of the main push jack 10 of the first-stage main push jack pedestal 23. 2040 mm is obtained by combining the propulsion length of the original push jack 10 of the second-stage original push jack pedestal 29 with the propulsion length of 1150 mm.

In the above embodiment, the SFT method has been described as one of the box body propulsion methods.
It can be applied to other box body propulsion methods as well.

1 Upper traffic 2 Retaining steel sheet pile 3 Starting shaft 4 Reaching shaft 5 Propulsion machine 6 Box-shaped roof 6a, 6b Hook-shaped joint 7 Friction cutter plate 8 Reaction force wall 9 Concrete box body 10 Main push jack 11 Cutting edge 14 Stopping member 16 Strut 17 Abdominal raising material 18 Tylot material 19 Retaining member 20 Starting platform 21 Spacer 22 Well girder frame 23 Main push jack stand 24 Rack stand 25 Connecting material 26 Guide frame wall 27 Push angle 28 Friction cutter plate control device 29 Original push jack stand 30 Chill tank
31 Rail 32 Guide steel with chill tank

Claims (6)

In the starting shaft that promotes the concrete box, the main push jacks that house the main push jacks in the rack stand are installed side by side behind the concrete box, and the main push jacks of the jack stands are connected to each other. Main push jack equipment in the box body propulsion method. The main push jack pedestal is the main push jack equipment in the box body propulsion method according to claim 1, which can be suspended in the starting shaft. Of the main push jack mounts installed side by side in the front and rear, the main push jack mount on the concrete box side is a front and rear movable type with a chill tank provided at the bottom, and the main push jack equipment in the box propulsion method according to claim 1 or 2. .. The main push jack equipment according to any one of claims 1 to 3, wherein a bearing plate is arranged between the main push jacks. The main push jack equipment according to any one of claims 1 to 4, wherein guide steel materials by chill tanks are installed on both sides of the jack stand. In the starting shaft that promotes the concrete box, multiple original push jacks with the original push jacks housed in the rack stand are installed side by side behind the concrete box, and the original push jacks of the jack mounts are connected to each other. Using the main push jack equipment in the construction method, the front main push jack pedestal and the concrete box are propelled by the main push jack of the rear main push jack pedestal when viewed from the concrete box, and then the front boss jack pedestal. This is a box propulsion method that uses the main push jack equipment in the box propulsion method, which is characterized by propelling a concrete box with the rear main push jack as a reaction force body.

Images