JPS58164821A - Trench excavation work - Google Patents

Abstract

PURPOSE:To make easier the excavation of trench as well as raise the resistance to soil pressure by connecting adjacent sheet piles in the longitudinal direction in such a way as to differentiate their joining positions. CONSTITUTION:A guide frame 1 is set in a trench and fixed by a spindle 2 as a tension, and lower sheet piles 18a of a different lengths are set in a guide space 7 and penetrated into the ground. When the upper end of the shortest lower sheet pile 18a is settled to the guide frame 1 by excavation of the trench, an upper sheet pile 18b is connected to the upper part of the sheet pile 18a by means of a connecting metal 16 to form a panel P of different joint positions and the inside of the trench is further excavated. Thus, since the joint positions are different, the weak points are not aligned in a row and therefore, the strength of the trench can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trench excavation method, and particularly to a trench excavation method suitable for excavating a deep trench for burying a sewer main pipe or the like underground.

In order to prevent the noise and vibration that are problems with the conventional construction method of driving steel sheet piles for excavating trenches, a pair of guide frames are placed on both sides of the excavated trench between them. The sheet piles are connected by spindles that act as shear tensions, and the sheet piles are inserted vertically into the vertical guide spaces of each guide frame, and the soil between the sheet piles that protrudes downward from both guide frames is excavated to settle the sheet piles and create a groove. The present applicant proposed to Sagi a construction method for excavating the soil and an earth retaining device used therefor (Japanese Patent Laid-Open No. 55-16172, Japanese Patent Application No. 53-8923).
No. 1).

By the way, when excavating a deep #jt for burying a sewer main pipe etc. by the above-mentioned known trench excavation method, the length of the sheet pile as an earth retaining wall inevitably becomes long, and its handling is not easy.

The present invention was made in view of the current situation, and its purpose is to create a trench excavation method that does not require swinging around long sheet piles even when excavating deep trenches, and that provides sufficient resistance to earth pressure. Ik-m is in service.

In the present invention, each of a plurality of sheet piles whose longitudinal side edges are slidably connected to each other is composed of a plurality of sheet pile parts that are connected vertically through seams, thereby eliminating the need to swing long sheet piles around during construction. However, when the valley sheet piles are fully settled, the lengths of the valley sheet pile parts are made to differ so that the seam positions of adjacent sheet piles are different vertically. It is designed to provide sufficient proof strength against.

An example of implementing the present invention will be described below with reference to the drawings.

In Figures 1 to 3, reference numeral 1 denotes a pair of sheet pile guide frames arranged oppositely on both sides of a trench A to be excavated, and these guide frames 1.1 are controlled by a spindle 2 as a cutting tension to control the width of the trench. Connected in direction.

Each of the sheet pile guide frames 1 has an equal upper frame portion 1a and a lower frame portion 1b as shown in FIGS. ? Eve 3.3
are integrally connected by. Both ends of the spindle 2 are suitably connected to the longitudinal/e-vebe 3. Both frame parts 1a
, lb is formed so that its planar shape as a whole forms a rectangular frame by a main cross member 4, a sub cross member 5, and a connecting arm 6 that connects them in the groove width direction. The spaces between the main cross members 4 and the secondary cross members 5 of the upper and lower frame parts la and lb are aligned vertically, and as shown in Fig. 1, these spaces allow the sheet pile p', which will be described in detail later, to be received. A sheet pile guide space 7 is formed to hold the sheet pile in an upright state.

The gap in the groove width direction of the sheet pile guide space 7 can be adjusted by adjusting the length of the connecting arm 6.

The upper and lower frame portions 1a, lb further include a vertical pipe 3.
They are integrated by a vertical connecting member 9 adjacent to the outside. In the illustrated example, the connecting member 9 is made of C-shaped steel (recessed channel steel), and the end portion of the main cross member 4 is fixed to the bottom wall of the connecting member 9 by welding or the like. In the illustrated example, the main cross member 4 and the secondary cross member 5 are composed of A-vebes, and the opposing sides of the main cross member 4 and the secondary cross member 50 have an arc shape that not only reinforces them but also serves as a guide for the sheet pile P. A 10° 11 cross-sectional additive is removably attached.

The distance between the guide frames 1, 1 in the groove width direction can be adjusted wide or narrow by rotating a turnbuckle 2a forming a part of the spindle 2, as shown in FIGS. 1 and 3. In addition, the length of each guide frame 1 in the groove longitudinal direction is the length of the main cross member 4.
and secondary cross members 5, and their additives 10 and 11
k, for example, as shown in FIG. 1, ll11i! at positions near both ends thereof. 12.13, it can be expanded by dividing. 4 and 5 show examples of stretching means for the main crosspiece 4. In FIGS.

In this example, a short pipe 14 having an outer diameter that can be slidably contacted with the inner surface is inserted into the inside of the horizontal member 4 at the position of the division [12]. t
- The penetrating part is secured by a bolt 15. Cross member 4
To extend the bolt 15, remove the bolt 15, separate the horizontal member 4 from the parting line 12 as shown in FIG.
into different holes. The secondary cross member 5 can also be extended using the same principle.

The sheet pile groups P inserted in the vertical direction into the sheet pile guide space 7 of each guide frame 1 configured in this way are arranged so that the bent edges of their longitudinal sides are engaged with each other as shown in FIGS. 6 and 7. A series of sheet piles that are relatively slidable vertically)Pl,
P2. It is constituted by a combination of P3..., and each sheet pile element P4. P2. P...
... is the connecting fitting 16'Jf: through the joint 17
It is composed of parts 18a and 18b'# connected by. And each sheet pile element P1. P2. P5
As shown in FIG. 7, the seam 17 between at least the adjacent sheet pile elements P5. P2. P3...
. . . are configured such that their positions in the vertical direction are shifted. This ensures that sufficient resistance to earth pressure can be obtained even if there are seams in each sheet pile.

In addition, in FIG. 2 and FIG. 3, 19 is a protector mounted on the upper end edge of the sheet pile P when pressing the sheet pile P downward.

Next, a method of excavating a trench using the trench excavating earth retaining device described above will be explained.

First, as shown in a longitudinal cross-sectional view in FIG. 8, a groove A' having a predetermined width and a depth approximately equal to the height of the guide frame 1 is excavated at the planned excavation position. Meanwhile, on the ground, the guide frames 1, 1 are connected by a total of four spindles 2, two on each upper and lower side, and are lowered into the groove A' as shown in the vertical cross-sectional view in the same figure. . The distance between the outer surfaces of the guide frame 1.1 when lowered into the groove A' is made slightly smaller than the width of the groove A', and after lowering the spindle 2 is extended by operating the turn knob 2a, The guide frames 1, 1 are brought into pressure contact with the groove wall surface. In this state, the connected steel sheet piles P are inserted into the guide spaces 7 of each guide frame 10 from above, and the lower ends are pushed into the soil somewhat as shown in the figure. At this time, each sheet pile element P1. P2.
Is P3...only for the lower element 18a? They are connected to each other and inserted into the sheet pile guide space 7.

Further, in the trench excavation direction, a similar trench A' is dug in the same manner as above, and the newly assembled guide frame 1.1 is sunk adjacent to the already sunk guide frames 1, 1, so that they are flush with each other on the same trench wall surface. Connecting flanges a and 20a f consisting of H-shaped fields are fitted into the grooves of the connecting fittings 9, 9 of the guide frames 1, 1 arranged side by side, and both guide frames 1.1 are connected in the longitudinal direction of the grooves. attitude(.

The guide frame 1.1 fitted into the groove A' is aligned with the opposing guide frame 1 and spindle 2? However, adjacent guide frames 1, 1 along the groove wall surface are connected by the connecting member as described above.

Then, the guide frame 1 which is fitted into the groove A' and faces the sheet pile P assembled only by the lower sheet pile portion 18a is inserted.
, 1, the sheet pile P remains upright and sinks as the earth is removed by the self-vehicle and the auxiliary rolling blade.

As the excavation and removal continues, the upper end of the shortest sheet pile element portion 18a descends to the upper end position of the inner row frame 1°1. Therefore, the upper sheet pile portion 18b is connected to the sheet pile portion 18a through the four fasteners 16. Then, the excavation and removal of earth is further continued, and the upper sheet pile portion 18b is fully connected to the lower sheet pile portion 18a, resulting in the state shown in FIG. 6.

In this state, excavation and removal are continued, and when the depth of the trench reaches a predetermined value and trench A is obtained, as shown in Figure 9, one buried pipe such as a Huyum pipe, which will become the main sewer pipe, is installed. In this way, the installed pipe is gradually extended. At this time, the sheet pile P is
As shown in the figure, each sheet pile element P4. P2. P5
. . . The seam 17 position is vertically shifted. Therefore, compared to the conventional construction method, where the joints of sheet pile elements that are added to excavate deep trenches are aligned at almost the same height and are particularly vulnerable, the weak parts are dispersed at different heights and are resistant to earth pressure. Sufficient proof strength can be obtained.

After the buried pipe connected at the bottom of the trench A is connected to the adjacent one, the sheet pile Pt is removed, the guide frame 1.1 is removed, and the trench A is sequentially backfilled.

Since the extracted guide frame 1 and sheet pile P are used repeatedly as the trench A is dug, a large number of sets are not required.

The sheet piles P, which are inserted into the guide frame 1 as described above and then sink as the depth of the groove increases due to excavation, are connected to each other within one guide frame 1. zuh are also upright so that they can slide freely relative to each other,
In the longitudinal direction, any sheet pile elm) P, , P2.
P5... is also in a state where it can settle independently.

On the other hand, water supply or gas service pipes (not shown) may exist at a depth of, for example, 1.5 m from the ground surface, intersecting almost horizontally with the direction in which the trench is being dug.

These lead-in pipes inevitably impede the settling of the sheet piles. When such an obstacle is encountered that cannot be removed, the sheet pile element in that position is prevented from settling by the obstacle, and only other sheet pile elements are allowed to settle.

In this construction method, similar to the construction method described in JP-A-55-16172, when constructing the sewer main pipe to be buried at the deepest position, each drainage pipe located at an intermediate depth is avoided and the sheet pile P' For safety, the sheet piles used as earth retaining walls are not forced into the trench, and as the depth of the trench increases, they are allowed to settle naturally. protector 19 due to packets etc.
It is possible to construct an overlay wall using sheet piles P by simply pushing it through the wall.In addition, when implementing this construction method,
If the spindle 2 with the lower 1 μmj is extended more so that the guide frames 1.1 on both sides form a V-shape, the sheet pile P
This prevents the sheet pile P from deforming inward due to the earth pressure that increases as it goes downward, and the width of the bottom of the basket becoming narrow.

As explained above, the present invention is constructed by joining together a plurality of sheet piles whose longitudinal edges are slidably connected to each other at joints, so even when excavating a deep trench, there is no need to swing long sheet piles. It is easy to install as there is no problem. In addition, when each sheet pile is settled, the lengths of the vertically stacked sheet piles are made different so that at least the seam positions of adjacent sheet piles are different vertically, so weak seams are dispersed and split-type sheet piles are created. Even when used, sufficient resistance to earth pressure can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the earth retaining device for trench excavation used in the present invention, Fig. 2 is a view taken in the direction of line T in Fig. 1, and Fig.
Group of diagrams - sectional view taken along line ■, Figure 4 is a diagram showing the divided part of the guide frame cross member, Figure 5 is the same extended state? 6 is a perspective view of the sheet pile, FIG. 7 is a front view thereof, and FIGS. 8 and 9 are explanatory views showing the construction sequence using the earth retaining device according to the present invention. 1. ...Guide frame, 2...Spindle, 7...Sheet pile guide space, 16...Connection fittings, 17...Joint, 18
a... Part of the sheet pile element, 18b... Part of the sheet pile element, A, A'... Groove, P... Sheet pile, P4
．． P2. PS...Sheet pile element. Applicant representative: Kiyoshi Inomata□ ＾

Claims (1)

[Claims] A pair of guide frames having sheet pile guide spaces in the vertical direction and facing each other in the width direction of the groove are connected to each other by a spindle as a shear tension, and the longitudinal side edges of each guide frame are slidable in the sheet pile guide space of each guide frame. In a trench excavation method in which a plurality of sheet piles connected to each other are inserted in the vertical direction and erected, earth is excavated between the sheet piles facing each other in the trench width direction, and the mutual sheet piles are gradually settled to form an earth retaining wall. Each sheet pile is composed of a plurality of sheet pile sections that are connected vertically through seams, and the length of the sheet pile sections is adjusted so that at least the joint positions of adjacent sheet piles are different vertically when each sheet pile is fully submerged. A trench excavation method characterized by different features.