JPS6237497A - Pipe beam structure - 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 [Field of Industrial Application] The present invention relates to a pipe beam structure used when constructing a road or the like under an existing structure.

[Conventional technology]

BACKGROUND ART Conventionally, the vibe beam construction method has been known as a construction method for constructing underground passages in places with little earth cover, such as under existing railways and roads.

As shown in Fig. 8, the pipe beam method involves connecting pipe beam materials 1 such as steel pipes to each other using joints 2, and pushing the pipe beam materials 1 horizontally and continuously under an existing structure such as a railway track. This is a construction method that supports the load of an existing structure using support beams 3' installed at both ends, and allows roads, waterways, etc. to be constructed by overpassing under the roadbed without restricting traffic on existing railways or roads. can. In addition, in the figure, 4
' is a support pile constructed prior to excavation to support the support beam 3', and two are provided at both ends and in the middle of the excavation cross section. The spaces between the support beam 3' and the support piles 4' at both ends and the pipe beam material 1 are still being filled with filler concrete 16.

[Problem that the invention seeks to solve]

Traditionally, pipe beams have been used as temporary construction for constructing concrete box-shaped tunnels. In order to use this as a permanent structure, the support beams cannot be supported by intermediate support piles as in the past, so a large amount of rigidity is required. For this reason, in the conventional method of joining the roof pipe (pipe beam material at the upper deck position) onto the upper flange of the support beam, the part h+ (
(see Figure 9) becomes larger, the road cross section becomes lower and the amount of excavated soil increases.

Therefore, in this invention, in order to obtain large rigidity, pipe beam materials are connected to the sides of the high girder support beams.
Therefore, we aimed to make the portion that protrudes below the lower edge of the roof pipe as small as possible.

[Means for solving problems]

In the pipe beam structure of the present invention, the end of the pipe beam material 1 at the upper floor slab position of the tunnel A is connected to the side of the support beam 3 for support. In addition, since the support beam 3 has a permanent structure, it has a high girder height and has high bending rigidity, and both ends of the support beam 3 are supported by the permanently installed RCC 10.
The pipe beam structure used as a temporary structure can be used as a permanent structure.

If the support beam 3 is a steel beam such as ■1 section steel, it shall be connected to its web, and if it is a steel reinforced concrete beam, the end of the pipe beam material 1 shall be connected to the concrete 13 of the support beam 3.
It can also be embedded inside.

The means for connecting the support beam 3 and the pipe beam material 1 include a mounting bracket 8 fixed to the side of the support beam 3 by welding or the like;
A reinforcing bar block 7 consisting of assembled reinforcing bars protruding in the longitudinal direction of the pipe beam material 1 can be inserted into the end of the pipe beam material 1 and firmly connected by filling it with concrete or the like.

〔Example〕

The illustrated embodiment will be explained below.

FIG. 1 is a front view of an embodiment of the present invention, in which support beams 3 made of H-shaped steel are supported by RCC 10 at both ends of tunnel A.
are provided, and support beams 3 at both ends support both ends of a pipe beam material 10 pushed horizontally into the soil. Figure 2 shows the state of the connection, and the connection part has reinforcing ribs 6, , 6' that are orthogonal to the support beam 3.

6" is welded. As shown in the figure, the height of the support beam 3 protruding downward from the pipe beam material 1 is extremely small compared to the glue in Figure 9, and Δh, , = h
, -ho It is possible to raise the road length.

In addition, 5 in Figure 1 is the RC bottom plate, and the support beam 3 and the left and right R
CC10 together form a rectangular framework. The pipe beam material 1 on the side wall of tunnel A is still connected with joints 2, and both ends are embedded and supported in RCC10 concrete.

FIG. 3 shows an example of the connection structure between the support beam 3 and the pipe beam material, and a strong connection structure is achieved by using a reinforcing bar block 7 as shown in FIG. 4. The reinforcing bar block 7 is a combination of a mounting bracket 8 and a plurality of reinforcing bars 9.
The mounting bracket 8 is welded to the side of the support beam 3, fitted to the end of the pipe beam material 1, and filled with concrete to join the support beam 3 and the end of the pipe beam material 1. be.

In this embodiment, the mounting bracket 8 has the shape of two plates crossed in a cross shape, one end of which is welded to the web of the support beam 3, and a number of axial reinforcing bars 9 welded to the side surface. A hoop muscle 9' is wrapped around it.

A concrete injection port 11 and a partition plate 10 to prevent concrete from flowing out are still provided at the end of the pipe beam material 1, and the reinforcing bars 9 of the reinforcing bar block 7 are placed between the support beam 3 and the pipe beam as reinforcement in the reinforced concrete. Transmits stress between materials 1.

In this case, the support beam 3 is constructed after the pipe beam material used as the roof pipe is pushed in, and the work procedure is as follows.

■ Manufacture the reinforcing bar block 7 in advance.

■Push the pipe beam material into the soil.

■ Indicate the position of the pipe beam material 1 on the support beam 3.

■ Weld the reinforcing bar block 7 to the support beam 3 on site.

■ Insert the reinforcing bar block 7 into the end of the pipe beam material 1, and install the support beam 3 in a predetermined position.

■ Concrete injection port 11 on the top surface of pipe beam material 1
Pour concrete from.

■ Weld the reinforcing ribs 6.6' and 6'' on-site.

Figures 5 (a) and (b) show the decrease in the amount of excavation when constructing a road, etc. that passes under the route in the level section of the route, and the bottom of the excavation changes from h to (h - Δh). When it decreases, the amount of excavated soil decreases. For example, if h = 10 m and Δh = 1 m, it will decrease.

Further, by reducing the approach by Δl, the range of application is expanded even when there are restrictions due to site restrictions. For example, i = 5%, Δh = 1. If m is Δ
ll: The approach will be shorter by 20m.

FIGS. 6 and 7 show an embodiment in which the support beam 3 is a steel reinforced concrete beam made of H-shaped steel 12 and concrete 13. In this case, a reinforcing bar insertion hole 15 is drilled in advance in the H-shaped @ 12, a reinforcing bar fixing ring 14 is welded thereon, this is fixed in a predetermined position, the reinforcing bar 9 is inserted, and the reinforcing bar 9 is welded to the fixing ring 14 and fixed. . After that, concrete is injected from the concrete injection port 11 at the upper end of the pipe beam material 1, the H-shaped steel 12 and the pipe beam material 1 are fixed, and the H-shaped steel 12 is wrapped with concrete 13.

In this case, a disc-shaped spacer or the like having a reinforcing bar insertion hole may be provided in advance in the pipe beam material 1 to guide and support the other end of the reinforcing bar 9.

〔'Effect of the invention〕

By joining the pipe beam material serving as the roof pipe to the side of the support beam, the length of the portion of the pipe beam material that protrudes below the lower edge can be reduced, making it possible to increase the longitudinal cross section of the road compared to the conventional method. Therefore, the amount of excavated soil is reduced accordingly, which is also advantageous when the site is subject to land restrictions.

Further, by connecting the support beam and the pipe beam material through the reinforcing blocks and concrete, a strong connection can be obtained, and the pipe beam can be used as a permanent structure.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the overall structure of an embodiment of the present invention, Fig. 2 is a side view showing the mounting state of the support beam and pipe beam material, Fig. 3 is a sectional view showing the structure of the joint part, Figure 4 is a perspective view of the reinforcing bar block, Figures 5 (a) and (b) are front views and cross-sectional views showing a comparison of the amount of excavated soil, and Figure 6 is a perspective view of the reinforcing bar block.
The figure is a sectional view showing the structure of the joint in another embodiment, FIG. 7 is a front view of the steel frame in that case, FIG. 8 is a front view showing the entire structure of the conventional example, and FIG. 9 is the conventional example. It is a side view which shows the attachment state of a support beam and a pipe beam material. A, A'...Tunnel pipe beam material, 2...Joint 3.3'...Brace beam, 4...RC column, 4'...Support pile 5...RC bottom plate, 6.6', 6 "...Reinforcement rib 7...Reinforcement block, 8...Mounting bracket 9...Reinforcement bar, 10...Partition plate 11...Concrete injection port, 12...H-shaped steel 13...
Concrete, 14... Ring for fixing reinforcing bars, 15... Reinforcing bar insertion holes, 16... Filling concrete, 17... Reinforcement ribs.

Claims (4)

[Claims] (1) Pipe beam made by connecting multiple pipe beams with joints installed on the sides, pushing them horizontally into the soil under the existing structure, and supporting both ends of the pipe beams with support beams. A pipe beam structure, characterized in that an end portion of the pipe beam material is joined to a side portion of the support beam. (2) The pipe beam structure according to claim 1, wherein the support beam is a steel beam made of H-shaped steel. (3) The pipe beam structure according to claim 1, wherein the support beam is a steel reinforced concrete beam. (4) A pipe beam made by connecting a plurality of pipe beam materials with each other through joints provided on the sides, pushing them horizontally into the soil under the existing structure, and supporting both ends of the pipe beam materials with support beams. In the structure, a reinforcing bar block consisting of a mounting bracket fixed to the side of the support beam and an assembly reinforcing bar protruding from the mounting bracket in the longitudinal direction of the pipe beam material is inserted into the end of the pipe beam material, and filled with concrete. A pipe beam structure characterized in that an end portion of the pipe beam material is coupled to a side portion of the support beam.