JP2722339B2 - Structure of buried part of catchment culvert and construction method of protection floor work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried part structure of a catchment culvert in which underground water or free ground water is taken by a perforated pipe buried under the riverbed or in an underground such as an old riverbed, and its protection floor. It relates to the construction method.

[0002]

2. Description of the Related Art As a method for collecting underground water and free groundwater, there is a water collection culvert in which a perforated water collection pipe made of reinforced concrete or the like is buried under a riverbed or an old riverbed.

As shown in a conceptual sectional perspective view of FIG. 13, a catchment culvert has a predetermined diameter of gravel around the catchment culvert 1 and gradually reduces the grain size outward. It is made small and buried at a predetermined depth. In order to prevent scouring and stabilize the riverbed, a scouring prevention member 2 generally referred to as a futon is installed on the riverbed at the site where the catchment burial is buried.

The futon basket 2 has a wire diameter of 8 to 10 (3
４4 mm) in a bag formed of a wire mesh knitted at about 100 m intervals.

[0005]

However, in the conventional structure as described above, the cobblestone in the futon basket and the gaps between the buried gravel layers in the futon basket are clogged with mud and fine sand flowing in the river during use. There was a problem that the flow path was blocked, and the amount of water taken was reduced. In order to eliminate such clogging, a futon basket or gravel layer had to be dug up and washed with heavy equipment, and a large-scale operation was required.

The boulders in the futon basket have a considerable size so that they do not fall off from the mesh, so that the gaps between the individual boulders are large and the arrangement of the gaps is coarse, and the permeated water flow concentrates in the coarse gaps. Therefore, there is a problem in that a uniform water flow cannot be obtained, and there is also a lot of clogging with earth and sand. The mesh of the futon basket is uniquely determined by using a wire having a necessary strength, and the mesh cannot be made small to accommodate the gravel.

Also, at the time of construction, the futon basket is formed of a wire mesh and is indefinite, so that the workability is poor and the stability is poor, and there is a large gap between adjacent ones. There is also a problem that sediment easily accumulates.

[0008] In addition, the cobblestone is housed in the futon basket, which must be packed tightly so as not to deform the wire mesh, which is difficult to mechanize, requires manual labor, and is extremely time-consuming. .

In other words, the futon basket as a scouring prevention member has the problem that the work of stuffing the cobblestone is troublesome at the time of construction and the workability is poor, and it is easily clogged at the time of operation and it is difficult to eliminate it. It has.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is difficult to cause clogging and can easily eliminate the clogging. It is an object of the present invention to provide a structure and a method for constructing a protection floor.

[0011]

According to the present invention, there is provided a catchment buried part structure of the present invention, wherein compressed air is supplied from a compressed air supply means into a gravel layer above the catchment culvert. A jet pipe member is disposed, and a side surface and a top surface of a frame formed in a rectangular parallelepiped having a predetermined thickness in a planar shape corresponding to an arrangement area of the air jet pipe member on the upper riverbed. And a bed guard surrounded by a net-like member, and is laid and accommodated with gravel therein. According to this configuration, the compressed air supplied by the compressed air supply means is ejected from the air ejection pipe member, penetrates through the upper gravel layer and the gravel layer of the bedrock, and escapes upward, and the air bubbles pass through the gap of the gravel. Discharge the accumulated mud and sand to eliminate clogging. Since the gravel is housed inside the frame whose side and top are surrounded by mesh members, the mesh member on the top prevents scouring of the inside gravel, and the movement of the frame is done by the internal gravel. Can be prevented.

The air jet pipe member is divided into a plurality of pipe units each having a predetermined length in a direction in which the catchment burial extends, and each of the pipe units is independently provided from the air supply means. It is characterized in that compressed air can be supplied. In this configuration, by supplying compressed air from the air supply unit to each of the divided pipe units, it is possible to perform the action of eliminating clogging in each part with compressed air having a uniform pressure without reducing the pressure of the remote part. it can.

[0013] Further, the frame of the protective flooring is characterized in that it is a collective frame in which a plurality of unit frames are connected to each other on a side surface and formed into a predetermined shape. At the laying position of the bedguard, a united frame is formed to a predetermined size by combining the united frames, and a collective frame provided with a net-like member only on the side portion is arranged, and after filling the gravel into the collective frame, A lid member made of a net-like member is fixed to the upper surface of each unit frame constituting the assembly frame. In this configuration, in order to configure the frame of the floor protection work by combining the unit frames, the shape and size can be set appropriately in accordance with the site to be processed. Further, according to the construction method, gravel can be packed in a frame disposed at the laying position by a heavy machine and constructed.

[0014] The mesh member is made of expanded metal. In this configuration, since the expanded metal is not woven, the mesh does not expand, and the mesh does not expand and the gravel contained in the frame does not flow out.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional perspective view conceptually showing a catchment buried part which is an embodiment of a catchment buried part structure according to the present invention, and FIG. 3 (A) is a view corresponding to a plan view at an arrangement position of the air blow pipe, and FIG. 3 (B) is a view corresponding to A-A in FIG. 3 (A).
It is a figure equivalent to A sectional drawing.

The drainage culvert 10 is buried at a predetermined depth by three layers of gravel layers (cobble gravel layer 11, medium-diameter gravel layer 12, and small-diameter gravel layer 13) whose particle size decreases in order, as shown in FIG. The connecting wells 20 are connected to each other. An air blow pipe 30 as an air ejection pipe member is buried at a predetermined distance above the drainage culvert 10, and the small diameter gravel layer 13 is provided.
On the riverbed above the riverbed, there is provided a guardian 40.

As shown in FIG. 3A, the air blow pipe 30 has a plurality of pipe units 31 (31A, 31A).
B, 31C) are disposed so as to cover the periphery of the junction well 20 and the upper side of the catchment culvert 10.

The pipe unit 31 is made of a stainless steel pipe, and as an example, as shown in FIG. 4, a plan view of a pipe unit 31A disposed above the water collection culvert 10 has two pipes of a predetermined length. The space between the conduits 30A
A plurality of (seven in FIG. 4) blower tubes 30B in a direction orthogonal to A are connected to form a ladder having a predetermined width. A supply pipe 34 is connected to one of the conduits 30A, and compressed air is supplied through the supply pipe 34. A plurality of air ejection holes 30C (shown in FIG. 1) are formed around the blower tube 30B, and the
The compressed air supplied from 0A is ejected from the air ejection hole 30C to the outside. Pipe unit 3
The width of 1 (the length in the direction orthogonal to the extending direction of the drainage culvert 10) corresponds to the path of permeated water contributing to the intake of the drainage culvert 10 at the position where the pipe unit 31 is provided. The entire size is set so that the compressed air can be supplied to all corners and a predetermined pressure can be maintained throughout, so that a uniform air ejection amount can be obtained from the air ejection hole 30C of the blower tube 30B. You.

The supply pipes 34 connected to the respective pipe units 31 are connected to a compressor 36 via a manifold section 35.
Compressed air is sent from the pump. Further, a valve 37 is provided on the downstream side of the manifold section 35, and by opening and closing the valve 37, the individual pipe units 31 can be operated independently (air ejection). . In FIG. 3, the supply pipe 34 and the compressor 36 are shown only in the right half pipe unit 31 in the figure, and the left half is omitted.

In the air blow pipe 30 having the above structure, compressed air from the compressor 37 is supplied to each pipe unit 31 through the supply pipe 34, supplied to the blower pipe 30B from the conduit 30A, and externally supplied from the air ejection hole 30C. To the gravel layers 11, 12, 1
By sewn up the gravel gaps of 3 and the bedguard 50, it works to discharge mud and sand clogged in those gaps.

In this configuration, the air blow pipe 30 is divided into a plurality of pipe units 31 and each of the pipe units 31 can be operated independently. By doing so, a uniform and sufficient amount of air is blown out over the entire surface of each pipe unit 31, and the effect of eliminating clogging can be effectively achieved at each position where each pipe unit 31 is provided. In other words, if the entire drainage culvert 10 is configured to be covered by an integral pipe structure, compressed air will not be supplied to the end due to a pressure drop due to air blowing from the middle, and the uniform air blowing amount as a whole will be reduced. As a result, the problem that the clogging of the end cannot be eliminated occurs, but according to the present configuration, such a problem does not occur. In addition, when the drainage culvert 10 is installed in a state nearly parallel to the water flow, the clogging operation is performed sequentially from the pipe unit 31 located on the upstream side, so that the operation on the upstream side is performed. As a result, mud and sand rolled up in running water can be prevented from accumulating on the gravel layer on the downstream drainage culvert 10 and causing clogging again.

The floor guard 40 is formed by combining the unit frames 50 to form a collective frame 41 shown in a perspective view in a state in which no gravel is stored in FIG. It is installed and installed in the riverbed corresponding to the burial position (that is, the burial position of the drainage culvert 10) with gravel contained therein.

The unit frame 50 has a rectangular parallelepiped frame 51 formed by a stainless steel angle and a flat plate as shown in a perspective view in FIG. 6, and side and end surfaces thereof as shown in an exploded perspective view in FIG. An expanded metal 52 as a mesh member made of a stainless alloy can be stretched, and a top plate 60 having an expanded metal 62 stretched on a flat frame 61 on the upper surface is fixed by bolts.

The collective frame 41 is provided with such a unit frame 50.
Are joined by spot welding to form a rectangular parallelepiped having a width and a predetermined length (the thickness is the thickness of the unit frame 50) corresponding to the area where the air blow pipe 30 is provided, and the entire side surface portion is surrounded by the expanded metal 52. It is formed in an inclined state.
That is, as shown in FIG. 8, a unit frame body 50A constituting a corner portion of the collective frame body 41 has a structure in which an expanded metal 52 is stretched on one side surface and one end surface, and the other end on the same side. As shown in FIG. 9, the unit frame body 50B constituting the corner portion of FIG. 9 has an expanded metal 52 stretched on one side surface and the end face opposite to the unit frame body 50A.
As shown in FIG. 10, a unit frame body 50C constituting an end of the collective frame body 41 is formed by extending the expanded metal 52 only on one side surface.
FIG. 11 shows an example in which an expanded metal 52 is stretched only at one end as shown in FIG. 11, and a central part which is not adjacent to the outer surface of the collective frame 41 is a frame 5 shown in FIG.
The united frame body 41 is formed by using only one unit frame body 50 </ b> E, whereby the collective frame body 41 in which only the side surfaces (front and rear end surfaces and left and right side surfaces) are surrounded by the expanded metal 52 is configured.

The assembled frame 41 thus formed is assembled in another place, carried without the ceiling plate 60 mounted thereon, placed at the installation site of the riverbed, and placed inside from above by a power shovel or the like. After filling the gravel, the top plate 60 is mounted on each of the unit frames 50 by fastening with bolts.

In the bedguard 40 constructed as described above, scouring is prevented by the top plate 60 without hindering the infiltration of seepage water, and the movement of the collecting frame 41 is stabilized by preventing the gravel filled therein. It does not create a large gap between adjacent items such as a futon basket. At the time of construction, it is not necessary to perform a cumbersome work such as installing a stuffed cobblestone into the riverbed by hand like a conventional futon basket on the riverbed, and after disposing the collecting frame body 41 at a predetermined position by heavy equipment , Can be mechanically filled with gravel. Further, by changing the assembly configuration of the unit frame 50, it is possible to easily cope with different shapes.

The mesh spacing of the expanded metal 50 may be set to such an extent that the gravel to be filled does not leak, and a gravel having a smaller particle diameter can be used than the cobblestone packed in the futon basket. The gaps that serve as the flow paths are small and uniformly arranged over the entirety, and clogging can be efficiently eliminated by the air jetted from the air blow pipe 30 described above. In other words, when using large cobblestones like a futon basket, the gaps between the cobblestones will be arranged coarsely, so mud and sand clogged in the large gaps can not be easily eliminated by the jet air, Clogging between the gravel can be easily eliminated.

In the above-described embodiment, expanded metal is used as the net-like member. However, the present invention is not limited to this, and a wire netting made of wire may be used. However, in the case of a wire mesh, there is a risk that the gravel contained in the wire mesh may leak due to the displacement of the mesh, and the expanded metal is preferable.

[0029]

As described above, according to the drainage buried section structure according to the present invention, the compressed air from the compressed air supply means is blown out from the air blowout pipe member, so that the bubbles of the blown air are blown out. Discharges mud and sand accumulated in the gaps of the gravel when the water passes through the upper gravel layer and the gravel layer of the bedguard and escapes upward, and the clogging can be eliminated very easily. Since the gravel is stored inside the frame whose side and top are surrounded by mesh members, the mesh members on the top prevent scouring of the inside gravel, and the movement of the frame is based on the inside gravel. In addition to being able to be installed stably because it is prevented by, it is possible to accommodate gravel with a small particle size, and the gravel with a small particle size provides a uniform water flow to form a small flow path densely, The clogging can be easily eliminated by the jet air from the air jet pipe.

Further, by dividing the air ejection pipe member into pipe units, the compressed air is supplied from the compressed air supply means for each pipe unit, so that the remote site is partially compressed by the compressed air with uniform pressure without decompression. The clogging can be completely and efficiently eliminated every time.

[0031] Further, by forming the frame of the above-mentioned bed guard by a collective frame in which a plurality of unit frames are combined, one kind of unit frame can be used to protect floors corresponding to construction sites having different shapes and sizes. It is possible to form and construct a construction work, and as a construction method, place the collective frame at the laying position of the protective floor work, fill it with gravel, and then fix the lid member on the upper surface of each unit frame body By doing so, it becomes possible to mechanize the work of filling the gravel, and the working efficiency is significantly improved.

Further, by making the mesh member made of expanded metal, the mesh does not expand and the gravel contained in the frame does not flow out, so that the mesh member can be made stable and have high durability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional perspective view conceptually showing a water-collecting burial buried part which is an embodiment of a water-collecting burial burying part structure according to the present invention.

FIG. 2 is a sectional view orthogonal to a drainage culvert.

FIG. 3A is a diagram corresponding to a plan view at an arrangement position of an air blow pipe, and FIG. 3B is a diagram corresponding to a cross-sectional view taken along line AA of FIG.

FIG. 4 is a plan view of a pipe unit constituting the air blow pipe.

FIG. 5 is a perspective view of a collective frame of the floor guard.

FIG. 6 is a perspective view showing a framework of a unit frame.

FIG. 7 is an exploded perspective view of a unit frame and a top plate.

FIG. 8 is a perspective view of a unit frame constituting a corner of the assembly frame.

FIG. 9 is a perspective view of a unit frame forming a corner of the assembly frame.

FIG. 10 is a perspective view of a unit frame constituting a side portion of the assembly frame.

FIG. 11 is a perspective view of a unit frame constituting an end of the collective frame.

FIG. 12 is a perspective view of a unit frame constituting a central portion of the assembly frame.

FIG. 13 is a cross-sectional perspective view conceptually showing a buried configuration of a conventional drainage culvert.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Catchment burial 11 Gravel layer 12 Medium-size gravel layer 13 Small-scale gravel layer 30 Air blow pipe (air ejection pipe member) 31 Pipe unit 36 Compressor (compressed air supply means) 40 Guard flooring 41 Assembly frame (frame) 50 Unit frame 52 Expanded metal (mesh member) 62 Expanded metal (mesh member)

Claims (5)

(57) [Claims] 1. An air ejection pipe member to which compressed air is supplied from compressed air supply means is disposed in a gravel layer above a drainage culvert, and the air ejection pipe member is provided on a riverbed above the member. A floor guard, in which the side and top surfaces of a frame body assembled into a rectangular parallelepiped with a predetermined thickness in a planar shape corresponding to the arrangement area of the members and surrounded by a net-like member, is laid to accommodate gravel inside. The structure of the buried drainage basin, characterized by being constructed as follows. 2. The air jet pipe member is divided into pipe units of a predetermined length in the direction of extension of the catchment culvert, and each of the pipe units is independent of the compressed air supply means. 2. The drainage buried part structure according to claim 1, wherein the compressed air is configured to be able to supply compressed air. 3. The collection according to claim 1, wherein the frame of the floor guard is a collective frame in which a plurality of unit frames are connected to each other on a side surface to form a predetermined shape. Water culvert buried part structure. 4. The underground structure of a drainage culvert according to claim 1, wherein the mesh member is made of expanded metal. 5. An assembly frame formed by combining unit frames and having a predetermined size and having a net-like member provided only on a side surface portion is disposed at the laying position of the floor guard, and the assembly frame is provided inside the assembly frame. 4. The protection system according to claim 3, wherein after filling the gravel, a lid member made of a net-like member is fixed to an upper surface of each unit frame constituting the collective frame. Floor construction method.