JPS58110732A - Installation of pipe culvert - 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 for installing pipes such as box culverts.

Conventionally, when installing a pipe in the bottom of an oven-cut trench, the foundation is created by laying chestnut stone or sand on the ground, and pouring dry mortar or waste concrete on top of it. However, with the conventional method, it takes time to level the foundation work,
Furthermore, when waste concrete is used, curing time is required before the required strength is achieved, making it difficult to speed up construction. Furthermore, when using a propulsion retainer for trench excavation, the propulsion reaction force by a hydraulic jack is applied to the installed pipe, but if the top surface accuracy of the foundation work is not perfect, the pipe may float up when pushed by the hydraulic jack. It is often pushed to one side.

This invention is a construction method developed to solve the above-mentioned conventional problems, and its details will be explained below with reference to illustrated embodiments.

First, skirt parts 2 and 3 are formed on both sides of the bottom peripheral edge of the pipe culvert used in this construction method, that is, a box culvert, and slightly closer to the tip side, a recess 4 is formed in the bottom surface, and a skirt part 6 on the tip side is formed. A small recess 5 is also formed on the outside. In addition, a steel rod insertion hole 6 in the connection direction is provided in a part of the body of the pipe 1, particularly in the four corners, and a steel rod tightening recess is provided in a direction intersecting with the steel rod insertion hole 6. A groove 7 is provided. Further, a grout injection hole 8 is provided in the bottom plate.

During construction, excavate between the propulsion retainers A using a bank four or the like, lay sand at the bottom of the excavation groove to form a mound 9, and then attach the steel rod 10 with the pipe 1 suspended above the mound 9. Set the tip of the pipe into the steel rod insertion hole 6 of the pipe culvert 1 that was installed and fixed first, and then jack the suspended pipe culvert B.
By pressing the mound 9, the pipe culvert 1 is connected to the pipe culvert 1 that has been installed and fixed first without applying any load, and the steel rod 10, which is housed in the steel rod insertion hole 6 of the pipe culvert 1, is connected to the pipe culverts 1, 1. The steel rods are positioned so as to straddle the steel rods, and are tightened with nuts in the steel rod tightening grooves 7 to connect and support the connected pipe 1 on the cantilever beam.

In addition, an amount of sand 91 that can withstand the grout field is piled up at a predetermined position on the mound 9 corresponding to the small recess 5 on the tip side of the pipe culvert to prevent the grout material from flowing out from the connection between the pipe culverts 1 and 1. Make it. When sand 9' is piled up, the sand 91 is piled up so that the grout material is also applied to the joint between the pipes 1 and 1, thereby creating a water-stop structure at the joint between the pipes 1 and 1. Further, when the propulsion retainer A is propelled, the side of the pipe culvert 1 is backfilled or filled with sand or the like.

A grouting material 12 such as cement mortar is injected into the recess 4 on the bottom surface of the pipe 1, which has been sealed in the manner described above, through the grouting pump 11 and hardened. Note that this grout injection work may be performed simultaneously for a plurality of pipes 1. Note that an air vent hole may be attached to the recess 4 at an appropriate position, if necessary.

The above construction is repeated with the propulsion of the propulsion retainer A, and the upper part of the pipe culvert 1 is appropriately backfilled with earth and sand to complete the construction.

This invention has the above-mentioned structure. Sand is laid at the bottom of the excavation trench to form a mound, and pipes can be brought in immediately. Furthermore, by connecting them with steel rods, they can be installed one after another, and the reaction force of the propulsion jack is taken care of. be able to.

The grouting work can be carried out later as appropriate, making the overall construction easier and faster.

[Brief explanation of the drawing]

Figures 1, 2 and 3 are front views of the pipe and I-1,
II-II cross-sectional view, Figures 4, 5, and 6 are cross-sectional views showing an overview of the construction process, Figure 7 is a detailed cross-sectional view of the construction process, and Figures 8 and 9 are steel rod cross-sectional views. It is a sectional view of a joint part. 1. Pipe culvert, 2, 3. Skirt portion, 4. Concave portion, 5.
・Small recess, 6. Steel rod insertion hole, 7. Groove, 8. Grout injection hole, 9. Mound, 91#. Sand, 10. Steel rod, 11. Pump, 12. Grout. Material, A...propulsion mountain retainer, B...jacket. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] Sand is laid at the bottom of the excavation trench to form a mound, then a skirt is formed around the bottom, a pipe with a recessed bottom is installed on each land, and the pipe is installed first. A pipe culvert installation method characterized by connecting and supporting a fixed pipe and a steel rod, then injecting grout into the recess whose surroundings are in a sealed state, and then sequentially repeating the above steps.