JPS598810A - Construction of bridge beam box - 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 Various construction methods have been proposed in the past for constructing roads, rivers, etc. under railroad tracks or under roads to cross over them.

One of the remaining construction methods is to push a steel pipe under a railroad track, for example, by digging an auger from inside the pipe in a direction perpendicular to this, and then pushing multiple pieces of the same pipe in parallel. The cross girder is constructed, and the main girders extending in the direction of the track are constructed at both ends to form a kind of lower girder, and #4M pipes are also pushed into the positions corresponding to the abutments and piers to create a temporary structure. The method used is to construct earth retaining walls, excavate the earth and sand inside the bridge, and then construct a reinforced concrete retaining wall. Furthermore, a construction method in which the steel pipe body is replaced with a reinforced concrete pipe body is also being used.

However, in the above construction method, pipe bodies are used as cross beams,
Since the bridge consists of one main girder in the track direction and both are integrated, it cannot be used with just the pipe body, and it is difficult to apply it when the cross girder is long.

In addition, a steel pipe is moved around the required bridge box, the earth and sand inside is excavated, and the support is erected.
Another method proposed is to complete the box by pouring reinforced concrete in place, but the larger the bridge's snow zone, the larger the shoring will need to be.

Construction becomes difficult.

The present invention has been proposed in order to eliminate such drawbacks, and has a plurality of prestressing steel insertion holes which are connected between a longitudinally penetrating working passage and a side wall and are substantially orthogonal to the working passage. The reinforced concrete inner blocks are horizontally paralleled at predetermined positions, and the inside of the blocks are excavated underground by tm, and the joint mortar is filled between the adjacent blocks, and the prestressed concrete steel of the adjacent bodies is A horizontal slab is constructed by inserting and tightening a PC steel material between the insertion holes, and then a plurality of the integral blocks are paralleled in a vertical direction on both sides of the lower part of the slab, and are dug into the ground in the same manner as described above. This relates to a method for constructing a bridge box, which is characterized by constructing a pair of bridge abutments on the left and right by connecting integral blocks adjacent to each other under the former, and pushing and removing the earth and sand surrounded by the horizontal slab and the abutments. be.

In the present invention, a reinforced concrete monolithic block is used as an element for constructing a bridge box, with a PC<IE material insertion hole that is substantially orthogonal to the working passage extending in the longitudinal direction communicating with the side wall. Then, by arranging a plurality of the P disease blocks in parallel in the part corresponding to the crossbeam, and using the work passage penetrating through the body blocks in the longitudinal direction, ni) excavate the pond from inside the body blocks and discharge the scooped earth and sand. By propelling it into the ground and filling it with joining mortar between adjacent national bodies, as well as inserting and tightening the PC steel material through the PCC steel insertion hole of each body block, the plurality of bodies are horizontally moved. An integral horizontal plate is constructed.

In this way, in the present invention, inclined reinforced concrete body blocks are pushed underground in parallel, and adjacent solid blocks are connected to each other to form an integrated plate-like girder. Therefore, there is no need for a main girder to support it, and by connecting the integral blocks, it is possible to construct a long girder.

Furthermore, in the present invention, the one-piece blocks are vertically arranged in parallel on the lower sides of the plate at the portions corresponding to the abutments and piers, and the same blocks are propelled into the pond in the same manner as described above. The inner body norotsukushi adjacent to the bottom of the L is connected, and the left and right piers and abutments are constructed, and the earth and sand surrounding these and the above-mentioned slab is removed by excavation and the bridge box is constructed. It is.

In this way, the present invention uses ready-made reinforced concrete body blocks to propel the blocks in parallel to a predetermined position underground, and connects them to construct a bridge box + m, so that the reinforced concrete block itself is part of the main structure. This makes it economical and shortens the construction period, and since the target block is excavated using the working path provided in the longitudinal direction of the target block, the work is easy and efficient. Even when this method is used to propel an integral block under railroad tracks or roads, it is safe because the excavation cross section is small, and compared to other construction methods, the equipment for propulsion is smaller and the shaft can be made smaller.

In addition, when connecting the integral blocks, insert the PC@ material into each insertion hole of the adjacent integral blocks using the PC steel material insertion holes that communicate between the working passage and the side wall of the two integral blocks. Since it is designed to be tightened through, the connection work can be easily performed from the working passage, and the prestressed steel material and its tightening jack can be used as ready-made products.

Additionally, the present invention has many advantages, such as the fact that the reinforced concrete blocks used in the present invention can be manufactured in a factory, resulting in a product of good quality.

The present invention will be described below with reference to the illustrated embodiments.

(The work passage (1) is inside the reinforced concrete body block, and the work passage (1) passes through it in the longitudinal direction.) The work passage (1) extends between the work passage (fl) and the side wall and is approximately perpendicular to the passage.
C steel material insertion holes (2) are arranged in a row. (Refer to Fig. 6) Then, a required number of integral blocks IAI are arranged horizontally in a row at predetermined positions, and the working passage (1) is used to excavate underground from inside the block, and the excavation chamber is It is discharged from the passageway (1), and is propelled into the integrated block (-) pond according to the progress of excavation.

Figure 4 shows the propulsion state of the front integrated block (Al).
3) is the shaft, (4) is the target block propulsion mount, and (5) is the attachment (6) installed at the rear end of the integral block fAj and the inner wall reaction support wall of the shaft (3). The propulsion jack (8) interposed in between is the earth retaining sheet pile, and excavates the required power board iB) with the cutting edge (9) at the tip of the rigid block [A] (7. At the same time, the propulsion jack (5) propels the N into the ground fBl.

In this way, when each image body Glock (A) is pushed 4μ into the ground fBl to the position of the hole, the adjacent inner body block IIUI
Fill the space between AJ with bonding mortar (10) or adhesive, and fill the adjacent image block fAl (each PC of Al
Insert the PC steel wire (former) between the material insertion insertion hole) f2) and tighten it with a jack, and connect it to the adjacent image block (F, In-) through the same pct wire (mark), thus making the same Each integral block constitutes one continuous horizontal plate made of Al.

Next, at the positions corresponding to the abutments on both sides of the lower part of the plate, the image blocks fAl are placed in a pond at a distance in the vertical direction. Propel, fill the joint mortar (10) between the adjacent target blocks fA1 under E, and fill the adjacent target blocks fA1 with
In the same manner as in the previous case, using the four holes for inserting the PC material, connect each of the target blocks via PC steel wires to construct an abutment.

Next, the earth and sand surrounded by the slab and abutment are excavated and removed to construct the required bridge box.

FIG. 2 shows another example of a bridge box constructed by the method of the present invention.

Although the embodiments of the present invention have been described above, the present invention is of course not limited to such practical examples, and various modifications of the design may be made without departing from the spirit of the present invention. It is.

[Brief explanation of drawings]

Part 1) is a slope view of one embodiment of a bridge box constructed by the method of the present invention, Fig. 2 is a front view of another embodiment of the same bridge box, and Fig. 6 is a view of the excavation of a reinforced concrete front block. FIG. 4 is a longitudinal side view showing the condition, and a slope view of the body block. (Hmm...Reinforced concrete painting block (1)...Work lff1 road (2)...PC steel material insertion hole 10
)...Haraiai mortar (111°-PGq material agent Rishi I, Shige Okamoto, two outsiders 10 10 I Sai1 Seki Fig. 2 + Fig. 3

Claims (1)

[Claims] A plurality of reinforced concrete block blocks are connected horizontally in parallel at a predetermined position by connecting a working passage penetrating in the longitudinal direction and the side wall with a PC steel insertion hole that is substantially orthogonal to the passage. Excavate the curve from inside the block and propel it.
A horizontal plate is constructed by filling the joint mortar between the adjacent one-piece blocks, and inserting and tightening the PC steel material between the PC steel insertion holes of the adjacent target bodies, and then filling both sides of the lower part of the same plate. A plurality of the integrated blocks are paralleled in the vertical direction and dug into the ground in the same manner as described above, and the beak blocks adjacent below are connected to construct a pair of left and right abutments, and the horizontal blocks and abutments are connected to each other. A bridge box construction method characterized by excavating and removing surrounding earth and sand.