JPS584094A - Method of constructing low road cross - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a low pass. More specifically, the present invention relates to a method for constructing a low-grade intersection across a railway or highway without affecting general traffic on the railway or highway.

Generally speaking, the method of constructing low-pass crossings across railways and highways is ``tunnel digging''.
) J method or “thrust propulsion”
Pelling ) J method is known.

Tunneling is an old method commonly used to construct low-pass crossings. Although this method requires little power equipment, it requires a lot of time and manpower because protection structures such as borium pipe ceilings and supporting soil must be constructed before excavation work. In addition, earth excavation and construction of supporting walls and concrete ceiling frames must be carried out alternately.

Furthermore, the excavation method is subject to vibrations caused by traffic on the road surface.
Safety issues are significant as it often results in deflection of the road infrastructure.

In the thrust propulsion method, defenses such as steel pipe roofs and pile walls must be placed, and strong reaction walls must be constructed for thrust propulsion operations. A ring-shaped culver made in advance with a gripping frame within the road base roughly along the construction line) (pr@oa
High power equipment, such as a push-pull jack, must be used to push the culvert box. However, such a method is difficult because it requires a lot of manpower, a lot of work time, and a lot of cost. Furthermore, if any mistakes occur during the thrust process, it is extremely difficult to correct them.

The main object of the present invention is to provide a method for constructing a low road intersection, which allows construction work to be carried out safely without being affected by vibrations from traffic on the road, and which can significantly shorten the work time.

Another object of the present invention is that there is no need to build defenses such as steel vibrator ms and steel plate pile walls, which are required in normal tunnel digging methods and thrust propulsion methods, thereby significantly reducing manpower and work costs. It is an object of the present invention to provide a method for reducing low road crossings, which occur rarely.

Therefore, the method of the present invention includes a towing step of sequentially towing the culvert boxes II& into the road foundation until the cross section corresponding to the construction line becomes a predetermined inverted U-shaped structure, and the cross section of the U-shaped structure of the culvert box. For low-pass crossings, the construction process generally involves constructing prestressed beams and supports, and the excavation process involves digging directly into the soil mass below the inverted U-shaped structure of the culvert box to create a designated path. The gist is the construction method.

Hereinafter, the present invention will be explained in detail using the drawings.

No. fF! ! J is a schematic diagram showing one embodiment of the culvert box towing process in the present invention, FIG. 2 is a side view showing the towing wall in FIG. A perspective view showing an example; FIG. 4 is a schematic diagram showing an example of the operation of connecting two culvert boxes according to the present invention; FIG. 5 is a cross-sectional view showing an example of a low-pass intersection constructed by the method of the present invention; FIG. 6 is a longitudinal sectional view of FIG. 5.

As shown in Figures 1 and 2, in the method of the present invention, two traction grooves (2) are first dug on one side along the road base +11, and two starting grooves (2) are dug on the other side. Groove (3)
dig. The starting groove (3) must be long enough to accommodate two or more culvert boxes (4) and wide enough to provide sufficient working space around it.

Next is the reinforced concrete type towing 1! +91 is constructed in the traction trench (21) along the road base (1) which coincides with the construction fin (ocmstrution lin@). Traction II (91 has 9 in the culvert box (4) for towing operations) A plurality of towing holes are drilled that correspond to the four provided holes.

Next, using a transverse drilling machine (not shown), a horizontal hole is made from the towing hole in the towing wall (9) to the departure groove (3) passing through the hole in culver 1i+41. to be drilled.

Next, the head of the drilling machine (not shown) is attached to the culver 1.
When the starting groove (3) is reached through the hole 14), the steel cable (5) is tightly attached to the head of the drilling machine.

Next, pull the head of the drilling machine back into the traction groove (2), remove the end of the steel cable (5) from the head, and then remove the end of the steel cable (5) from the head.
The end of the anchor member αυ is fixed to the towing wall (9).

Next, the other end of the steel cable (5) is securely fastened to the traction jack (2) attached to the rear end of the culvert box (4).

Next, in the same manner as described above, the operation of securely fastening the other 06 steel cables to the towing wall (9) and to the towing jack (2) attached to the rear end of the first culvert box (4) is repeated. As shown in Figure 6, the culvert box (4) has the shape of a rectangular parallelepiped, with holes penetrating through the four corners of the - side to the opposite side, and holes on both bottom edges. A groove parallel to the hole (sha) is formed.

Next, a steel knife (6) is installed at the forward end of the first culvert box (4).

Next, operate the hydraulic pump of each towing jack @ to simultaneously pull the four steel cables (5) toward the towing wall (9) to the right (in Fig. 111), and pull the first culver) @
(Push 41 into the road base (1) in line with the construction line.

Before towing the second culvert box, remove the four steel cables (5) together with the towing jack (2) from the first culvert box (4), and remove the clods in the culvert box (4). . Then, in the same way as above, connect the four steel cables +
5) into the hole drilled in the second culvert box II (41), and insert the rear end of the second culvert box located at the rear end of the first culvert box. Top traction shirt (
2), start the traction jack υ, and
The first culvert box (4) is towed and pushed into the road foundation (1). The same procedure is repeated to achieve traction of the second culvert box (4), and then each culvert box (6th, 4th, 5th, etc.) is tested. Pull it until it reaches the back of the wall (9).

After the first section of the culvert box (4) is completed, the second, sixth, and fourth sections are sequentially constructed using the same puyaces as described in the work for the first section. This is done until an inverted U-shaped structure as shown is completed.

According to the method of the present invention, the towing operation of the culvert box is carried out by using a towing jack to tow the culvert box along the hole I and the hole that are pre-drilled to coincide with the construction line. will be constructed. Therefore,
Juxtaposition and stacking of the culvert boxes on both sides and on top is done at perfect horizontal and vertical levels as shown in WJ 5.

After the towing operation is completed, the towing wall (9) is removed, all steel knife ledges (6) are removed from the forward end of the culvert box, and the pier foundation (as shown in No. 5) is removed. ) are constructed in each of the towing ditch (2) and the starting ditch +31. At that time, it goes without saying that a geological survey should be conducted in advance to determine the support strength of the earth's gills and to determine the placement of the foundations αJ of the bridge piers before starting the construction. If necessary, foundation piles are used to increase the support strength of the sub-base and to prevent future subsidence of the road base.

As shown in Figures 5 and 6, after placing concrete α9 on the foundation side of the bridge pier, reinforcing reinforcing bars QΦ are placed for the support part (to) and the bridge girder αη on both sides of the structure. , clean the interior of all Culver II compartments and place several shell pipes (sh@1lpipe) f8) therein. On the other hand, the shell pipe (8) is placed in the pre-drilled hole track as well as on the outside of the support and the bridge girder surface for later prestressing work.

4th v! As shown in Figure i, in the construction of a low crossing, all culvert boxes are connected at each level, and high-tensile bolts (towards) are connected.
is inserted into the hole, and the support plate has the injection port (sha) on the side Wi.
Insert the bolt into the bolt 0 seconds above, screw in the nuts 09 on both sides of the support &■, tighten the nuts α9 so that the culvert box forms one unit, and pour the mixed cement into the injection port to prevent the metal parts from rusting. Inject into @. After completing the above work, assemble the support part Q61 and the cover plate for the bridge girder 0η, and install high-strength concrete)
*tr@ngth oonor@to) (Usually compressive strength!00 910m2 or more) in a culvert box (4)
and put it in the template.

During the concrete pouring operation, a high speed vibrator is preferably used to densify the concrete 09.

After an appropriate hardening period, a plurality of prestress concrete steel materials (hereinafter referred to as PO steel materials) are inserted into the shell pipe (81) that has been placed in advance, and one end of the PO steel material is attached to the support part αG and the bridge girder αη as an anchor member. 0υ, and connect the other end to the traction jack (2) so as to pull it to a preset strength before fixing it to the anchor member as shown in Figure 6. After removing the , the prestress creates a tensile stress and each of the culvert boxes is configured to load the support beam.

The prestress of the prestressed beam is given based on a predetermined load and safety factor.

If necessary, shell pipes and pom materials may be placed in the pre-drilled holes in each of the culvert boxes (4) to increase the strength of the prestressed beams.

On the other hand, when the load requirement on the road surface is relatively small, the prestressing work within the culvert box area as shown in the above process can be omitted, and the prestressing work is only carried out within the holes of the culvert box. The work may be performed. Of course, depending on the load requirements of the road, there may be cases where it is sufficient to simply inject cement without performing prestressing work.

After the prestressing work is completed, the final step is to excavate the earth clod underneath the culvert box structure. With the completion of the load-bearing structure of the low-road crossing in the present invention, both sides of the road foundation are free from digging holes, since the protection provided by the supports (2) and the bridge girders aη has already served. The work will not slow down or detour traffic on the road, and will not require driving steel plates or other work or equipment to protect the road infrastructure.

Therefore, an excavator is used to directly dig a hole in the soil mass below the rubato box structure. When the digging work has been completed to a predetermined extent,
Place gravel (c) or create a slope top and pour concrete onto the low road crossing surface. After the groove joints between the culvert boxes have been waterproofed by filling them with epoxy resin, all construction of the low-grade crossing will be completed and it will be ready for traffic.

Other operations related to low-grade crossings, such as guideways, are not described here as they are not necessary for the method of the invention.

The method of constructing a low crossing of the present invention, the construction process of which has been described in detail above, provides the most efficient method of constructing a low crossing or similar structure. Furthermore, we provide not only the safest conditions for construction work, but also the lowest costs. In addition, this method for constructing low-grade crossings does not require final surface preparation of the structure, which can significantly reduce construction time.

It should be noted that the above description has only considered one embodiment of the present invention, and various changes in the screwing process can be made based on the claims of the present application.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an embodiment of the culvert box towing process in the present invention, Fig. 2 is a side view showing the traction wall in Fig. 1, and Fig. S is a schematic diagram showing an embodiment of the culvert box towing process in the present invention. A perspective view showing an example, FIG.
Schematic diagram showing an example of connection operation of two culvert boxes, No. 5
The figure is a cross-sectional view showing an example of a low road crossing constructed by the method of the present invention, and FIG. 6 is a longitudinal cross-sectional view of FIG. 5. (Main symbols in the drawing) (1): Road base (2) Double traction groove (3): Departure groove (4): Culvert box (5): Steel cable (6): Nye 7 edge (9) Two traction groove Wall U: Anchor member az: Traction jack No. 11: Hole (421: Groove joint Patent applicant: Dongkong Ant Setup Co., Ltd. Donggu Long Yingzou Co., Ltd. Fig. 1 71 Fig. 2 Fig. 3 Fig. 74

Claims (1)

[Claims] 1. A construction line in which a plurality of culvert boxes are installed in a road foundation and 1.
A towing process in which the laid section is pulled sequentially until it becomes an inverted U-shaped structure, and the above-mentioned ry# of the culvert box! - a construction process in which prestressed beams and support structures are erected for the cross-section of the culvert box; and an excavation process in which the earth mass beneath the inverted U-shaped structure of the culvert box is directly excavated to create a passageway. How to construct a low road crossing. 2. The construction method of claim 1, wherein the towing step is configured to properly advance the culvert box along the construction line so as to form an inverted U-shaped structure using the culvert box. 6. The towing process excavates a towing trench along one side of the road base and a starting trench along the other side of sufficient width to accommodate at least 211 culvert boxes and workers. A process in which a concrete traction wall having a plurality of traction holes drilled in correspondence with the positions of pre-drilled holes in the culvert box is placed in the traction trench along the road base. , The wall for 1! a step of drilling horizontally from the first hole through the road base toward the departure groove until the tip of the drilling machine passes through a hole provided in the culvert box and reaches the rear end of the culvert box; At the rear end of the culvert box in the trench, a steel cable is fastened to the tip of the drilling machine, the drilling machine is pulled back to the towing groove, and one end of the steel cable is fixed to the towing wall by an anchor member; A process of fixing the other end to a towing jack located in a hole at the rear end of the culvert, a drilling process similar to the above for the remaining holes in the culvert box, a process of fixing the steel cable with an anchor member, and a process of fixing the steel cable. A process of repeating the fixing process to the traction jack, a process of installing a steel knife at the forward end of the culvert box, and a process of operating the traction jack fixed to the rear end of the culvert box to pull the steel cable to the right at the same time. 3. The method of claim 2, further comprising the steps of: accurately towing the culvert box into the road foundation along the construction line through the road foundation toward the towing wall. 4. The construction method according to claim mS, wherein the pulling step is repeated until the inverted U-shaped cross-sectional structure is completed so as to match the construction line. 5. The construction method according to claim 4, which comprises the step of removing the towing wall after the towing work for the inverted U-shaped structure of the culvert box is completed. 6. The traction process involves drilling holes at appropriate intervals on the joint side of the culvert box, inserting high-tensile bolts into the holes, fitting a support plate with an injection port into the bolts, and screwing nuts on both sides of the support plate. , by further tightening the nuts, all the culvert boxes are joined into a U-shape, and by adding mixed cement into the inlet, the metal parts are prevented from rusting, and all the culvert boxes forming the said U-shaped structure are joined. ) A construction method according to claim 4, comprising the step of fixing the box together. 7 The configuration of prestressed beams and supports is the process of constructing the foundations of the bridge piers on both sides of the road-foundation, and the figure 8. By configuring supports and beams on both sides of the shaped structure, installing anchor members, tightening, and pouring mortar, the culvert box of the U-shaped structure is prestressed and A construction method according to claim 1, comprising a prestressing step in which the support portion and the bridge are reinforced. 8. The construction method according to claim 7, wherein the prestressing work is performed by inserting a plurality of prestressing steel members through pipes placed in concrete. 9. A patent in which the excavation of the earth clod under the U-shaped structure is carried out using an excavator for directly digging out the earth clod, without affecting normal traffic on the road and without requiring any other precautions. A construction method according to claim 1.