JPH0414518A - Method for constructing new retaining wall at old retaining wall position on neighboring line - Google Patents

Abstract

PURPOSE:To prevent occurrence of cracks or collapse in an adjacent area by destroying the side face section of an underground structure from the bottom to the top and, at the same time, performing earth filling and earth banking works. CONSTITUTION:After shores 8 are fitted to the inside an underground structure 1, the structure 1 is destroyed toward its side face section 4 from the middlemost part of the bottom surface section 5 of the structure 1 and replacing work which carries the material produced by the destroying work toward the middlemost part is successively repeated. While the exposed side face section 4 of the structure 1 is destroyed, the material is replaced to a gap formed by the replacing work and, at the same time, the side face section 4 is filled with soil and sand. Then temporary inner bottom filling work is performed in the next area and, at the same time, destruction of the side face section 4, transportation of the produced material to a temporary bottom section, and earth banking to the side face section 4 are performed. Moreover, removal of the shores 8 and destroying, earth filling, and earth banking works are repeated in one area depending on the length of the side face section 4 in the erecting direction.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention applies to the construction of a new retaining wall at the location of an existing earth retaining wall on the proximity line (the line 10 meters from the adjacent building or boundary, hereinafter simply referred to as the proximity line). It concerns the method of constructing earth retaining walls.

``Conventional techniques and their problems'' There is no suitable method for collapsing the existing earth retaining wall built on the adjacent line and constructing a new earth retaining wall in this location, which is difficult.

However, the construction methods that are currently used in some areas, such as using sheet piles, struts, and lintels, save a lot of time and effort, and there are many problems.

However, it is no exaggeration to say that with conventional construction methods, it is not possible to construct a new retaining wall in a location where an existing retaining wall is located on the adjacent line.

"Means for Solving the Problems" In view of the above, the present invention is capable of reliably and easily constructing a new earth retaining wall on the adjacent line and at the location of the existing earth retaining wall. In order to make effective use of the structure, we will first install struts to prevent the existing retaining walls from collapsing.

First, remove the soil at the bottom of the root cut. At this time, perform the first excavation from approximately the middle of the root cut in the direction of the earth retaining wall, and repeat the first excavation to excavate all the earth and sand at the bottom of the root cut. Excavation and embankment work will be carried out sequentially, leaving the earth retaining walls exposed.

Then, when this root cutting, bottom embankment and excavation process is completed, the exposed earth retaining wall is collapsed to the 111th degree, and the collapsed debris is transferred to the embankment gap, and the collapsed existing earth retaining wall part is collapsed. If one section is filled with a collapsed earth mound that is filled with earth and sand (hereinafter referred to as "good soil") that is not contaminated with rubble, stones, etc., one section of the earth mound for the foundation and the earth retaining wall will be created. collapse ends.

Therefore, the next step was to collapse the earth embankment and earth retaining wall. First, we made an embankment with earth and sand to the extent that the existing earth retaining wall was exposed, and then we built a plank bottom embankment to form a temporary inner bottom surface. .

Thereafter, the collapse of the earth retaining wall, the removal of debris, and the collapsing earth embankment work are carried out in the same manner as in the process described above, thereby completing the collapse of the earth embankment and earth retaining wall of the repeated section.

Furthermore, according to the length of the earth-retaining wall in the erection direction, the scattering of the struts and the repeated soil mounding and collapsing of the earth-retaining wall are repeated, and a good earth mound is built up at the position of the existing earth-retaining wall. .

This is a construction method in which a new earth retaining wall is then constructed at the position of this earth mound (good soil), and a new earth retaining wall is constructed at the position of the existing earth retaining wall on the adjacent line.

Furthermore, the present invention does not cause any adverse effects such as loosening or collapse on the adjacent ground. Additionally, in order to prevent problems such as tilting of houses, walls, and other structures and undue subsidence, the existing earth retaining walls should first be constructed with struts or with raised sides (not shown). At the same time, in the part of the collapsed earth retaining wall, in order to prevent the collapse of the adjacent land in the collapsed earth retaining wall part, underground This is a construction method in which earth is raised from the outside.

Furthermore, in order to be able to reliably construct a new earth retaining wall in the area of an existing earth retaining wall, the present invention provides that this area (an area equivalent to at least approximately 30 square widths from the adjacent land) has a better construction than the outside. This is a method of filling with soil.

Furthermore, in order to construct a new earth retaining wall in a short time and efficiently using the above construction method, the present invention performs work such as collapsing the existing earth retaining wall and mounding earth from the bottom of the root cut. And during this process, the bottom is excavated.

Then, the next block of earth mounds and retaining walls began to collapse, forming an embankment with earth and sand, and forming a temporary inner bottom.
After that, the above-mentioned collapse of the earth retaining wall, removal of debris, and collapse earth mounding work to form the earth mound are completed, and the repeated collapse of the earth mound and earth retaining wall of one section is completed.

Thereafter, in accordance with the length of the earth retaining wall in the erecting direction, the removal of the struts and the repeated soil mounding and collapsing of the earth retaining wall are repeated to fill the existing earth retaining wall position with good soil.

This is a construction method in which a new earth retaining wall is then constructed at the position of the existing earth retaining wall on the adjacent line to which a new earth retaining wall is constructed.

"Operation" A detailed explanation of the present invention will be given below. First, as shown in FIG.
In order to prevent the earth retaining wall from collapsing, installing the appropriate number of struts using the strut construction method is a process.

Next, the construction can be carried out in the order shown in Figure 3, or first, as shown in Figure 3 (a), first remove the earth and sand at the bottom of the root cut of the earth retaining wall. Excavation is carried out sequentially from the part indicated by the chain line in the middle towards the retaining wall, and some of this excavated earth and sand is removed to other parts.

The above-mentioned excavation is carried out in sequence as shown by the imaginary lines in FIG.

The excavated soil can be easily transported and removed, and ultimately,
When all the earth and sand at the bottom of the root cut is excavated and the earth retaining wall is exposed, the result will be as shown in the same figure (b).

Subsequently, when this root cutting and bottom embankment line and excavation process is completed, the exposed earth retaining wall shown by the chain line is collapsed 1110 times as shown in the same figure (c). As shown in the figure (e), the collapsed debris was transferred to the embankment gap, and as shown in the same figure (e), the collapsed existing retaining station area was
Build an earthen mound and fill it with good soil, and repeat this collapse and filling process 7 times in order until the collapse of the retaining wall and all earth mounds in this area are complete.

This completes the collapse of the earth embankment and retaining wall in one section of the foundation.

Therefore, as shown in the same figure (f), whether the next block of earth mounds and retaining walls collapse, or at this time, the embankment is first constructed with earth and sand brought in from outside to the extent that the existing earth retaining walls are exposed. , as shown by the phantom line, forms a plank bottom embankment that constitutes a temporary inner bottom surface.

After that, as shown in the same figure (g), similar to the process described above, collapse of the retaining wall, removal of debris, and collapse earth mounding work will be carried out. At the end of this process, the collapse of the earth mound and retaining wall in one section is completed (see Figure 1).
The state will be as follows.

Furthermore, in step 5, corresponding to the length of the earth retaining wall in the erection direction, the removal of the strut and the collapse of the soil mound and earth retaining wall in one section are repeated, and debris etc. and earth and sand are deposited at the position of the existing earth retaining wall. It is piled up with earth (see (S) to (R) in the same figure).

As a result, as shown in Figure (f), the existing earth retaining wall is filled with good soil, and it is possible to construct a new earth retaining wall, and there is no negative impact on the adjacent ground. There are also very few.

Thereafter, as shown in FIG. 5, an i-set earth retaining wall is constructed using the excavating machine shown in FIG. 6.

Incidentally, the excavation work machine can also have the structure shown in FIG.

``Example'' The illustrated equipment and equipment are in a tunnel, which represents an example most suitable for use in carrying out the present invention, and 1 is an adjacent building;
2 is the foundation block, 3 is the foundation pile, 4 is the existing retaining wall, 5
numeral 6 is a paddle-cut bottom surrounded by the existing retaining wall, and numeral 6 is a room such as a garage, a storeroom, or a basement.

The existing earth retaining wall 4 of the room 6 constructed as described above is collapsed and a new earth retaining wall 14 is constructed. The collapsed earth retaining wall at that time is shown as 4a, and the earth mound that is restored to the collapsed earth retaining wall 4a is shown as 7.

8 in the diagram is the existing earth retaining @! 14, and is laid as appropriate depending on the depth dimension of the room 6, and is appropriately reduced in accordance with the collapse of the existing earth retaining wall 4.

Further, reference numeral 9 is an embankment made of earth and sand brought in from the outside, and forms a temporary inner bottom surface 9a when the existing earth retaining wall 4 above the root cut bottom 5 is collapsed.

The above-mentioned codes and the operations or configurations of the codes are the same even when each section is sequentially configured by repeating the code.

The excavation work machine shown in Figs. 5 and 4 is a machine used when constructing a new earth retaining wall at the site of the collapsed existing earth retaining wall, and its outline is as follows: In the crane, lI22 of this crane 21 has 270
An excavation work machine 24 which can be rotated is suspended in a substantially vertical state via a pulley 23.

This excavation work machine 24 consists of two steel bars 25.25a set up with a narrow spacing, a chain wheel 26.27 pivoted at the upper and lower ends between the two steel bars 25.25a, and chain wheel 2
6. Numerous claw-shaped double-curved metal fittings 28 wrapped between 27
... (hereinafter simply referred to as 28). Its dimensions are approximately 90 mm wide
~1201, Hagane 25.25a spacing is 17~30L?
II+, a length of 450 to 800 cm is considered ideal.

The chain 29 wound between the chain wheels 26 and 27 is driven forward and backward by a motor 30 installed between the chain wheels 25 and 25a, and as a result, the claw-shaped double-curved metal fitting 28 is rotated forward and backward, and this Due to the reversal of the rotation, the new earth retaining wall 1
Holes at four positions are sequentially dug underground, and ultimately a hole of the same depth is drilled using the spline method.

In this spline hole, the gap created by the lifting of the excavating machine 24 is filled with ready-mixed concrete, and a new earth retaining wall 14 containing molded steel is constructed, or mortar, cement milk, etc. are press-fitted. , Soil cement f
JT tiered retaining u14 is constructed.

In the figure, 31 is a pulley for suspending the excavating machine 24, 32 is a lobe, and 33 is a supporting member provided on one side of the excavating machine 24 for supporting the pulley 31. Takade,
The excavation work machine 24 is attached to the tower 22 via the support member 33, the pulley 31, the lobe 32, and the pulley 23.
0 It is suspended so that it can rotate.

Incidentally, the spatula main body 2 forming the main body of the clawed spatula type double-curved metal fitting 28
The entire earth removal curved surface 8a and the claw 28b provided on the spatula main body 28a completely protrude from the front and rear direction and the lower end surface of the two steel plates 25.25a, and also protrude considerably in the width direction. Yes, and both sides of the earth removal curved surface and the claw 28
Both side surfaces of b protrude considerably from the end surfaces in the width direction of both steel sheets 25.25a.

As a result, the shape of the raspline hole excavated by the excavating machine 24 is one size larger than the main body of the excavating machine 24.

Therefore, the earth pressure resistance against the main body of the excavating machine 24 can be almost eliminated, so this excavating machine 24
It becomes possible to sink under its own weight.

Further, FIG. 6 shows a multi-axis excavating machine 44, such as a -axis to five axes (the illustrated example shows a three-axis excavating machine).
, 41 is its rotational drive device, 42 is a multi-axis device, 43a
~43c is an oakermann with an ocher screw.

It goes without saying that the construction method of the present invention can also be used for a part of the existing earth retaining wall 4, and such construction method is also included in the scope of the present invention.

"Effects of the Invention" As detailed above, in the present invention, after installing the strut, first of all, the earth and sand at the bottom of the root cut are removed. At this time,
Excavation is carried out sequentially from approximately the middle of the root cut in the direction of the earth retaining wall, and the earth and sand at the bottom of the root cut are excavated (1) in sequence, while embankment work is carried out in sequence, leaving a portion of the soil. None, and consists of an excavated embankment that exposes the retaining wall.

Then, when the root cutting and bottom embankment and excavation processes are completed, the exposed earth retaining walls are sequentially collapsed and the collapsed debris is transferred to the embankment gap, and the collapsed existing earth retaining wall parts are removed. Then, if a collapsed earth mound, which is a mound of earth filled with good soil, is made for the entire area, the collapse of the earth mound of one area of the foundation and the earth retaining wall will be completed.

Therefore, the next step was to collapse the earth embankment and earth retaining wall. First, we made an embankment with earth and sand to the extent that the existing earth retaining wall was exposed, and then we built a plank bottom embankment to form a temporary inner bottom surface. .

Thereafter, the collapse of the earth retaining wall, the removal of debris, and the collapsing earth embankment work are carried out in the same manner as in the process described above, thereby completing the collapse of the earth embankment and earth retaining wall of the repeated section.

Furthermore, in accordance with the length of the earth-retaining wall in the erection direction, the sills are removed, the soil mound of one section is repeated, and the collapse of the earth-retaining wall is reversed, and a good earth mound is placed at the position of the existing earth-retaining wall. Ru.

This is a construction method in which a new earth retaining wall is then constructed at the position of this earth mound (good soil), and a new earth retaining wall is constructed at the position of the existing earth retaining wall on the adjacent line.

Therefore, the effect of being able to reliably and easily construct a new earth retaining wall at the location of an existing earth retaining wall built on the adjacent line, and the great effect of eliminating the waste of land and making effective use of land. be.

In addition, the present invention first prevents the existing earth retaining wall from collapsing by using struts or erectors (not shown), etc., and at the same time prevents the collapsed earth retaining wall from collapsing. In order to prevent the adjacent land from collapsing in the area of the earth retaining wall, this is a construction method in which earth is piled up from outside into the ground corresponding to the earth retaining wall area.

Therefore, there shall be no adverse effects such as loosening or collapse on the adjacent ground. In addition, in order to prevent troubles such as tilting of buildings such as houses and fences and undue subsidence from occurring, the present invention further provides a construction method in which the existing earth retaining wall is filled with soil better than the outside. It is.

Therefore, it has the effect of allowing a new earth retaining wall to be constructed reliably and easily at the site of an existing earth retaining wall.

Further, in the present invention, work such as demolishing the existing earth retaining wall and earth embankment is first performed from the bottom of the phase cut, and the bottom is excavated during this work.

Then, the next block of earth mounds and retaining walls will collapse, and after forming the embankment with earth and sand and forming a temporary inner bottom, the aforementioned earth retaining walls will collapse, debris will be removed, and debris will be removed. Collapse to form an earth mound The earth mound work is completed, and the repeated collapse of one area of earth mound and retaining wall is completed.

After that, the length of the earth retaining wall is paralleled in the erection direction, and the struts are removed, and the above-mentioned repeated earth mounding and collapse of the earth retaining wall are repeated. be done.

This is a construction method in which a new earth retaining wall is then constructed at the position of the existing earth retaining wall on the adjacent line to a new earth retaining wall at this earth mound position.

Therefore, when demolishing the existing earth retaining wall and constructing a new earth retaining wall in this area, it has the effect of being able to construct it efficiently and in a very short period of time.

[Brief explanation of drawings]

The drawings show an example of this construction method. Figure 1 is a cross-sectional view before construction, Figure 2 is a cross-sectional view with the struts installed, and Figures 3 (a) to (t) are cross-sectional views. Fig. 4 is a schematic diagram showing an example of the construction order, Fig. 4 is a cross-sectional view of the fJi earth retaining wall being constructed, and Fig. 5 and Fig. 6 are schematic diagrams showing an example of the excavation work machine. be. 25.25a: 4111 plate 26.27: Chain wheel 28: Plough type double curved metal fitting with claw 28a: i% body 28b: claw 29: Chain 30: Motor 32:
Loaf 33: Supporting member 44; Multi-axis excavation machine 42: Multi-axis devices 43a to 43c: Oakermann 1: Building 2: Foundation block 3: Foundation pile 4: Existing retaining wall 4a: Collapsed retaining wall 5: Root cutting 8! 6: Room 7: Earth mound 9: Embankment 9a: Inner bottom surface 14: New earth retaining wall 21
: Crane 22: Tower 23.31; Pulley 24: Excavation machine dormitory diagram 4

Claims (1)

[Claims] (1) In order to prevent the earth retaining wall from collapsing, there is a beam installation process in which an appropriate number of struts are installed using the beam construction method, and the roots of the earth retaining wall are removed to remove earth and sand at the bottom of the cut. An embankment in which excavation is carried out sequentially from approximately the middle part of the cut land toward the retaining wall side, part of this excavated soil is removed to another part, and the remaining excavated soil is transferred toward the middle part. The excavation and filling process involves repeating the work in sequence to excavate all of the earth and sand at the bottom of the root cut, leaving a portion behind, and then carrying out the embankment work in order to expose the retaining wall. At that point, the exposed earth retaining walls are sequentially collapsed, the collapsed debris is transferred to the embankment gap, and the collapsed existing earth retaining walls are sequentially filled with pure earth and sand such as debris and stones. This collapse and filling process is repeated sequentially to collapse the earth retaining wall of this one section and form the entire earth mound, and when this process is completed, the earth mound of one section of the foundation is completed. The collapse of the earth retaining wall ends. Therefore, the next section of earth mound and earth retaining wall will collapse, but first, the existing earth retaining wall will be exposed.
A temporary inner bottom embankment process in which earth and sand brought in from outside are used to form a temporary inner bottom surface, and then a collapse earth embankment process in which retaining walls collapse, debris is removed, and a soil embankment is created, which is similar to the process described above. , When this step is completed, the collapse of the earth embankment and earth retaining wall of the repeated section is completed. Furthermore, in accordance with the length of the earth retaining wall in the erection direction, the removal of the struts and the repeated earth mounding and collapse of the earth retaining wall were repeated, and debris, etc., and earth were piled up at the existing earth retaining wall position. Ru. A construction method in which a new earth retaining wall is then constructed at the position of the existing earth retaining wall on the adjacent line to construct a new earth retaining wall at this earth mound location.