JPH11210373A - Spacer using method for sheath pipe to be laid by small-bore propulsive construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the gradient accuracy of a sewer pipe to be inserted into a sheath pipe which is laid by a small bore propulsive method. SOLUTION: The propelling accuracy of a sheath pipe 3 laid by a small bore propulsive method is not good originally, so that the gradient of a sewer pipe to be inserted to this sheath pipe 3 involves a low accuracy. Therefore, a pair of bolts 14 are furnished on a spacer 1 fitted on the sewer pipe, and the ends of these bolts 14 are abutted to the inner surface of the sheath pipe 3, and an accurate gradient is obtained by obtaining the gradient of sewer pipe by a nut 15 fitted on the bolts 14. In calculating the gradient, the depth of the inlet/outlet of the sheath pipe 3 and the specified gradient of the sewer pipe are taken into account, and the nut 15 is threadeadly engaged so that the value indicated is obtained, which should directly give the standard gradient of sewer pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of using a spacer for a sheath tube laid using a small-diameter propulsion method.

[0002]

2. Description of the Related Art In general, the propulsion method in sewerage works is as follows.
It is used for crossing work that crosses highways, tracks, rivers, etc. that cannot be excavated.However, compared with excavation, this propulsion method does not hinder traffic, reduces noise and vibration, and is economical. Due to certain advantages, it has been adopted for the vertical section method.

By the way, there are various methods of this propulsion method, for example, a small-diameter special propulsion method for embedding a pipe having a diameter of 700 mmφ or less, which is difficult and involves danger (simply, a small-diameter propulsion method). Various methods, such as a press-fit type, a horizontal auger type, and a horizontal balance type, have been developed. In addition, a one-step method and a two-step method have been developed in this press-fitting method.

By the way, the one-step press-in type propulsion method is
This method refers to a method in which a steel pipe is directly pushed in by a hydraulic jack and carried out by an auger that appropriately inserts earth and sand in the steel pipe. Therefore, since the press-fitting small-diameter propulsion method is the simplest method among the propulsion methods, it is used for soft soil such as soft soil and sandy soil, and exhibits the above-mentioned advantages.

However, in such a small-diameter propulsion method, since the pipe is directly propelled, it is impossible to set a curve.
Poor propulsion accuracy or extended construction (eg 5.5m)
Have shortcomings such as being short.

For example, the factors of poor propulsion accuracy are as follows. 1) The factors depending on the soil conditions include, for example, those due to inhomogeneity or change in soil, and those due to floating of the propulsion pipe due to spring water. ) Obstacles include, for example, piles and old seawalls. 3) Pipes and used machinery (hydraulic jacks) include, for example, pipe shaft bends and unevenness of pipe end faces, and hydraulic jack habits. And 4) the construction is caused by an error in the initial position or operation at the start. Therefore, it is said that the small-diameter propulsion method has poor propulsion accuracy due to these various factors.

Therefore, for example, when sewage main pipes having a diameter of 300 mm are to be buried in flat ground, the standard gradient is set at 4 °, but it is easy to set this gradient by the small-diameter propulsion method as described above. is not.

[0008] Therefore, a method of piping an insertion tube as a sewer pipe with a predetermined slope in a sheath pipe laid by a small-diameter propulsion method has been performed, and the present applicant has also provided equipment for performing such a method. Then, a spacer for a sheath tube to be laid by using a small-diameter propulsion method has already been proposed (Japanese Patent Laid-Open No. 9-19).
No. 6232).

In other words, a spacer provided between a sheath pipe directly laid and laid by the small-diameter propulsion method and a polyvinyl chloride sewer pipe sequentially inserted into the sheath pipe is provided with a flange body externally fitted to the sewer pipe. And a bolt screwed to both ears of the flange body, and both ends of which abut against the inner surface of the sheath tube. Suggested.

By the way, a method of inserting a sewer pipe into a sheath pipe using a small-diameter small-diameter propulsion method is generally performed as follows.

[0011] That is, after each of the starting and reaching standing piles is cut and cut on the left and right sides of the crossing point, a small hydraulic jack is installed on the starting and standing piles, mirror-cut (perforation of steel sheet piles), and then made of steel pipe. Set the sheath tube in the hydraulic jack and propel it.

[0012] This operation is performed with a predetermined number of sheath pipes (for example, when the pipe length is 700 mm and the transverse length (maximum) is 5.5 m, 8
(Requires this), and repeatedly lays crossing. After the series of embedding of the sheath tube is completed or in the middle of the process, the sediment in the sheath tube is discharged by an auger, and then a PVC sewer pipe is inserted into the sheath tube.

Therefore, the outer diameter of the sheath tube is set to 300 mm
If φ, the sewer pipe has a nominal diameter of 100mmφ or 120mmφ
And a 150 mmφ can be inserted, and a donut-shaped space is formed between the sheath pipe and the sewer pipe. To support. Then, after inserting the sewage pipe into the sheath pipe through the spacer, a filler such as mortar is injected to complete the construction.

[0014]

However, in such propulsion of a sheath tube, it is difficult to expect high propulsion accuracy as described above, and the straightness of the sheath tube is varied depending on the construction site as described above. On the other hand, since the laying of the sewer pipe is required to have a steep gradient, these conflicting operations are adjusted by the screwing positions of the bolts in the spacer in the above proposal.

By the way, as described in the above-mentioned proposal, this spacer is formed by a pair of upper and lower flanges externally fitted to a sewer pipe, and screwed to both ears of these flanges, respectively, and at both ends thereof. Since the portion is composed of a pair of bolts abutting on the inner surface of the sheath pipe, it is easy to determine the slope of the sewer pipe itself at the screwed position of the bolt in the sheath pipe, but the slope of the sheath pipe is easy. It has been found that it is not easy to determine the predetermined gradient obtained by adding or subtracting at the screwing position of the bolt, and the present invention was created based on such finding.

That is, the first object of the present invention is to solve the above-mentioned problems, to provide a low-cost construction without greatly improving the conventional sheath tube spacer, and to make handling easier. Is a secondary purpose.

[0017]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has the following points: 1) a sheath tube directly propelled by a small-diameter propulsion method and laid, and a PVC tube inserted sequentially into the sheath tube. A spacer provided between the sewer pipe and the bolt is inserted into the left and right joints of the split band sandwiching the sewer pipe and tightened with nuts, and both ends of these bolts are fixed to the inner surface of the sheath pipe. By setting the tightening position by the nut by adding or subtracting a predetermined gradient of the sewer pipe to the difference between the burial depth of the upstream and downstream ends of the sheath pipe in the vertical pile. 2. A method of using a spacer for a sheath tube laid using a small-diameter propulsion method, which covers poor propulsion accuracy of the sheath tube by the small-diameter propulsion method. The tightening position of the nut Of the sheath tube to be laid using a small-caliber jacking method to determine the scale displayed on the door space - in the used method.

Therefore, the present invention includes the following embodiments. The outer diameter of the sheath pipe is fixed at 300 mmφ, and the nominal diameter of the drain inserted into this can be 100 mmφ, 125 mmφ, or 150 mmφ. Therefore, one hydraulic jack is required for propulsion of the sheath pipe. At the same time, the amount of earth and sand discharged in the sheath tube and the amount of excavation of the standing pile can be made constant, and furthermore, the amount of filling mortar can be reduced.

In a series of sheath pipes having a length of about 5.5 m, the length of one sheath pipe is 700 mm, and the length of one drain pipe of the rubber ring receiving piece straight receiving pipe is about 680 mm to 735 m.
m, the width of the starting stake can be reduced to about 900 mm, and without blocking traffic on public roads of small width,
Small diameter propulsion method can be applied.

Since the standing pile is formed as a buried hole in a PVC public pit, the construction can be simplified even if the width of the cut groove is narrow.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments shown in the accompanying drawings. 1 is a side view of a first embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is an application example of FIG. 2, FIG. 4 is an application example of FIG. 3, and FIG. It is sectional drawing of an example.

The spacer 1 according to the first embodiment of the present invention is a steel pipe (STK) having a diameter of 300 mm and a pipe length of 700 mm using a small-diameter propulsion method, particularly a one-step press-fit type propulsion method.
400), and a series of these sheathed tubes are provided with a straight rubber tube receiving piece (a pipe length of about 680 mm to about 730 mm).
mm), which is convenient for inserting a mounting pipe (referred to as a pipe laid to connect the public basin and the sewage main pipe).

First, a sheath tube 3 for laying the mounting tube 2
The outline of the method of propelling by the small diameter propulsion method will be outlined.

In FIG. 4, when the irrigation channel 6 is constructed between the building 4 and the sewage main pipe 5 in a private area, the mounting pipe 2 is laid across the irrigation channel 6. The attachment pipe 2 connects a public square (not shown) and the sewage main pipe 5.

For this reason, about 900 m wide on the sewer main pipe 5
m and the reaching pile 8 at the place where the public basin is installed. The interval between these standing piles, that is, the maximum propulsion distance of the mounting pipe 2 is preferably 5.5 m. In addition, the sheet piles 9 and 9 are driven into the side surface of the starting standing stake 7 for digging.

Next, the sheet pile 9 is cut into a mirror, and a small hydraulic jack (not shown) is mounted on the starting pile 7. Then, the sheath pipes 3 are propelled one by one by the hydraulic jack, and the earth and sand is discharged by an auger (not shown) as required.

Receptacles and spigots are formed at both ends of the sheath tube 3 made of steel, so that it can be joined well with the subsequent sheath tube.

When the series of sheath pipes 3, 3... Are laid in this way, the hydraulic jack is removed, the earth and sand is discharged by an auger, and then the inside of the pipes is cleaned.

Next, the PVC mounting pipe 2 fitted with the spacer 1 is inserted into the sheath pipe 3 sequentially, and then is inserted into the donut space 11 formed between the mounting pipe 2 and the sheath pipe 3. Filling material such as mortar is injected to complete the installation work of the mounting pipe 2. The downstream end of the mounting pipe 2 and the sewage main pipe 5 are connected by a 90 ° branch pipe 10 or the like.

In this case, the spacers 1 are provided one above each of a series of laid sheath tubes 3 and near both downstream ends thereof.
It is convenient to equally divide them and arrange them in the middle.

That is, since the spacer 1 is used to calculate a difference between the straightness error or the gradient of the sheath tube 3 and the gradient of the mounting tube 2 to obtain a predetermined standard gradient of the mounting tube 2. First, the burying depths D1 and D2 from the surface GL in the upper and lower stream sides of the series of sheath tubes 3, that is, the starting standing pile 7 and the reaching standing pile 8 are respectively measured. This measurement is very easy.

As a result, the gradient of the series of sheath pipes 3 (if the hydraulic jack used in this embodiment, the propulsion accuracy was 5
/ 1000 is possible, and the propulsion gradient can be up to 3%). Therefore, the spacer 1 obtained by adding or subtracting the gradient of the sheath tube 3 to the gradient of the mounting tube 2 is used as the inlet of the sheath tube 3. -When used on the outlet side, a predetermined standard gradient is immediately formed in the mounting pipe 2, which is convenient.

If the spacer 1 is attached in the middle of a series of sheath tubes 3 equally, the inclination of the attachment tube 2 is automatically obtained, which is convenient.

The spacer 1 as described above is configured as follows. That is, the spacer 1 is configured so that the mounting pipe 2 is sandwiched between two bands (flange bodies) 12 and 12 made of resin (for example, recycled plastic such as PP and ABS). Both ends of long bolts 14, 14 for fastening the mating portions (ear portions) 13, 13 of the 12, 12 are brought into contact with the inner surface of the sheath tube 3.

Therefore, the bolt 14 is connected to the left and right mating portions 1.
3 and 13 respectively, and these joining portions 13
When tightened with the two upper and lower nuts 15, 15 screwed to the bolt 14, the mating portion 1 of the split bands 12
3 is tightened, and the vertical position of the mounting tube 2 is determined.

At the time of this fastening, a mark (not shown) provided in the pipe axis direction on the top of the outer peripheral pipe of the mounting pipe 2 and a center mark 16 provided on the top of the split band 12 are joined. Therefore, the spacer 1 is fastened to the mounting pipe 2 in a normal posture without being twisted.

Therefore, in this bolt 14, the screwing position L of the upper and lower nuts 15, 15 screwed by two spanners (this L is precisely the mating portion of the split band 12 below the lower end of the bolt 14). 13 (which indicates the distance to the lower surface) can be adjusted vertically in an adjustable range S as shown in FIG.

That is, for example, a sheath tube 3 having an outer diameter of 300 mmφ (the outer diameter of the sheath tube 3 is
The mounting pipe 2 to be inserted into the hydraulic jack or the like is fixed to a nominal diameter of 100 mmφ (outer diameter d = 114 mm).
φ), the distance A between the mating parts 13 and 13 is 175 m.
Assuming that m and the length B of the bolt 14 are 240, the mounting tube 2 is joined to the tube bottom on the inner surface of the sheath tube 3 (L shown by a broken line in the figure).
1 = minimum value), L1 = 35 mm, when the pipe centers of the mounting pipe 2 and the sheath pipe 3 coincide (L0 = center position shown by a solid line in the figure), L0 = 110 mm, the mounting pipe 2 is the inner surface of the sheath pipe 3 (L2 = maximum value shown by a broken line in the figure)
= 185 mm can be adjusted in the vertical direction within the range of the obtained values. Of course, the nominal diameter of the mounting pipe 2 is 125 m
For mφ and 150 mmφ, the values of A, B and L0, L1, L2 change.

Therefore, if a scale is formed on the bolt 14 by the meter method with the minimum value L1 of the screwing position L as a base point, the adjustable range of the mounting tube 2 can be determined in advance, and The amount of rise of the gradient is immediately known from the joint position L.

In other words, if the bolt 14 is provided with a surface trimmer 17 and a scale (in units of 1 mm) is engraved on the surface trimmer 17 by using the lower portion as a base point, the minimum value L1 of the screwing position L can be obtained. In addition to the center position L0 and the maximum value L2, it is possible to immediately determine the rising amount of the predetermined standard gradient obtained by adding or subtracting the easily measured gradient of the mounting tube 2 and the gradient of the sheath tube 3. That is, adjustment can be performed together with easy actual measurement without calculation using a measure.

Next, another embodiment of the present invention will be described. In FIG. 5, the lower nut 15 is configured as an embedded nut 15a embedded in the fitting portion 13 from below. With this configuration, the spanner for adjusting the screw position L only needs to rotate the upper nut 15 alone, and the screw position L is not obstructed by the height of the nut. In addition, the above-mentioned PVC attachment pipe may be a sewage main pipe.

[0042]

According to the present invention, the tightening position of the nut screwed to the bolt is added to or subtracted from the difference between the actually buried depth of the standing pile at the upstream and downstream ends of the sheath pipe by the slope of the sewer pipe. The poor accuracy of the sheath pipe propulsion by the small-diameter propulsion method can be covered immediately, especially in a narrow construction site, and thus the predetermined slope of the sewer pipe can be obtained accurately, and the laying accuracy of the sewer pipe can be obtained. And reliability is obtained.

In particular, since the burial depth at the upper and lower ends of the sheath tube can be easily measured in the starting standing stake and the reaching standing stake (public pit), the difference between the depths can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a diagram illustrating an application example of FIG. 2;

FIG. 4 is an application example diagram of FIG. 3;

FIG. 5 is a sectional view of another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Spacer, 2 ... Mounting pipe, 3 ... Sheath pipe, 12 ... Split band, 13 ... Joining part, 14 ... Bolt, 15 ... Nut,
D1, D2 ... buried depth

Claims (2)

[Claims] A spacer provided between a sheath pipe directly laid and laid by a small-diameter thrust method and a polyvinyl chloride sewer pipe sequentially inserted into the sheath pipe, a split band sandwiching the sewer pipe. The bolts are inserted into the left and right mating portions and fastened with nuts, and the spacers are configured with spacers such that both ends of the bolts are in contact with the inner surface of the sheath tube. It is characterized by covering the poor accuracy of the sheath pipe propulsion by the small-diameter propulsion method by adding and subtracting a predetermined gradient of the sewer pipe to the difference between the burial depth of the upstream and downstream ends of the sheath pipe in the vertical pile. Spacer usage of sheath tube laid using small diameter propulsion method. 2. A spacer use method for a sheath tube which is laid using a small-diameter propulsion method in which a tightening position by a nut according to claim 1 is determined by a scale indicated on a bolt screwed with the nut.