JP2562785B2 - Underdrain joint and its construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underdrain joint for water supply / sewerage, a common ditch, an underground passage, a tunnel, a submerged box, and a method for constructing the joint.

[0002]

2. Description of the Related Art Conventionally, for example, an underdrain joint as shown in FIG. 5 has been known. This joint is composed of a plurality of circumferentially-spaced inner side walls b1 and b1 'of annular anchor members b and b'mounted on the end faces of a pair of underdrain a and a'to be connected. The end portion of the load bearing member c is inserted and connected so as to be movable and detachable within a certain range, and the inner side walls b1 and b1 'of the anchoring member are arranged outside the annular row of the plurality of load bearing members c. Of the outer and inner primary side flexible waterproofing members d, the secondary outer flexible water blocking member e, and the load bearing member c, which are provided on the outer and inner peripheral sides of a short cylinder whose ends are fixed between the anchoring members. Water-tightly connected by an inner flexible water blocking member f in the shape of a short tube disposed inside the annular row and having fixed ends between both anchoring members, and both anchoring members are attached to the outer periphery of each load-bearing member c. The cylindrical body 2 which is slightly shorter than the initial interval is loosely fitted.

In the construction of the underdrain by the propulsion method, the primary lining method is a segment construction method in which the segments g and g'are connected. Is introduced by applying a high pressure. This 2
In order to construct the framework of the flexible joint portion for placing concrete by the next lining, in the above joint, an annular 2
The next lining frame plates h and h'are attached to the anchoring member inner side walls b1 and b1 '.
Install on the inner circumference side of. Further, ring-shaped anchor mounting members i, i'are fixed to the concrete placing side of the inner peripheral side end portions of the frame plates h, h '.
A plurality of anchors j, j ′ are hooked on i ′. The opposite ends of the anchors j and j'are the outer side walls b of the anchor members b and b '.
2 and b2 'are spot-welded to the inner peripheral end. The annular frame plates h and h'are divided into a plurality of parts, and adjacent frame plate parts are connected to each other by bolts by joint plates k and k '.

With the above construction, concrete is poured up to the frame plates h and h'by a slide form machine to construct the secondary lining parts l and l '. In addition, m is an inner cover rubber provided for smoothing the inner surface of the pipe and preventing invasion of dust into the space between the frame plates h and h ', and n is an upper space of the primary outer peripheral water blocking member. It is a skin plate that prevents the entry of dust and the like.

Further, for example, as described in Japanese Patent Publication No. 22818/1990, the outer peripheral sides of the annular anchor members g, g'attached to the end faces a, a'of a pair of underdrain to be connected. A water blocking member p for primary water blocking which is made of incompressible rubber, synthetic resin, or the like is attached to the extended portions o, o ', and an anchoring member g,
It is known that a flexible water blocking member Q made of rubber, synthetic resin or the like for secondary water blocking is attached to the inner peripheral side of g '. As shown in FIG. 6, this joint is provided by abutting short tubular bodies s and s'on an intermediate portion r of a flexible water blocking member Q, and abutting portions t and t'of the short tubular bodies s and s'. And the inner side walls b, b'of the anchor members g, g '
The end portions u and u'of the flexible water blocking member are clamped between them and clamped and fixed by the shrimp vise v and v ', and the inner side walls of the flexible water blocking member r and the anchoring members g and g'. It is intended to improve the water blocking property between b and b '.

When a secondary lining is performed in this type of joint, a gable plate (not shown) is temporarily fixed to the inner peripheral side end of the annular frame plate w fixed to the short tubular body s. Concrete is cast up to the frame plate w by a slide form machine to construct the secondary lining portion x. Next, the end plate is removed, the joint material y is arranged, and then the concrete is cast up to the side wall of the joint material to construct the secondary lining portion x '.

[0007]

As described above, in the conventional joint shown in FIG. 5, since the concrete is placed by the secondary lining, the frame composed of the frame plates h, h ', etc. is constructed. The framework overhangs largely from the primary lining parts g, g'into the underdrain, so that it is troublesome to move the slide form machine without touching the framework.
In addition, the specified movement width of the slide form machine is usually 9 m, but if a joint is present at an intermediate position of this specified movement width, concrete pouring is performed up to the position of one frame plate (for example, h) that is less than the specified movement width. After that, the concrete pouring is cut off once, then the joint position is removed and the concrete pouring is done to the position of the other frame plate (eg h '). Therefore, continuous concrete pouring from one side of the underdrain to the other is impossible. Therefore, in this respect, there is a problem that the efficiency of the secondary lining work is deteriorated.

Further, the secondary lining is carried out by placing concrete in a predetermined radial width measured from the wall surface of the underdrain formed by the excavation, but the diameter of the joint portion caused by the variation in the excavation of the underdrain. The allowable range of the positional deviation in the conventional joint is an extremely small range indicated by D1 in FIG. 5, and therefore, for example, when the joint portion is depressed more than D1 than the underdrain a'due to variations in excavation, slide The foam machine is caught on the tip of the frame and the planned secondary lining work cannot be done. Therefore, extremely high excavation accuracy is required to secure the allowable range D1 of this small positional deviation.

Further, in the conventional joint shown in FIG.
Since the end plate is temporarily fixed to the frame plate w at the time of the next lining, this end plate largely overhangs in the underdrain, and the same problem as the joint of FIG. 5 occurs.

The present invention has been made in consideration of the problems of the above-mentioned conventional joints, and the efficiency of the secondary lining work is good, and the accuracy of the excavation accuracy in the excavation work of the underdrain is reduced. The joint and its construction method are to be provided.

[0011]

The joint of the present invention which achieves the above-mentioned object, is mounted on the end faces of a pair of underdrain to be connected.
In an underdrain joint provided with a flexible water blocking member in the shape of a short tube provided between a pair of annular anchoring members, a secondary cover for a space in which the flexible water blocking member can expand and contract between the anchoring members. A joint material for preventing the inflow of working concrete, and a thickness in the radial direction of the joint that enables continuous pouring of secondary lining concrete from one side of the underdrain to be connected to the other along the inner peripheral surface thereof. A joint material having is provided between the anchor members.

Further, according to a method of constructing a joint of the present invention which achieves the above object, each of the anchoring members of a joint having a short tubular flexible water blocking member provided between a pair of annular anchoring members is connected. Should be 1
A step of attaching the primary lining of the pair of underdrain to each end surface, and a step of setting the flexible water blocking member between the anchoring members into a space in which it can expand and contract.
A joint material for preventing the inflow of secondary lining concrete, and a joint radial direction along which the secondary lining concrete can be continuously cast from one side of the underdrain to be connected to the other along the inner peripheral surface thereof. A joint material having a thickness of between the anchor members, and a secondary covering continuously from one side of the underdrain to be connected to the other side of the underdrain to be connected along the inner peripheral surface of the joint. And a step of forming a gap between the culverts to be connected by cutting a portion of the secondary lining concrete that has been placed between the anchoring members by a predetermined width. It is characterized by being provided.

According to the present invention, a joint material for preventing inflow of the secondary lining concrete into the space where the flexible water blocking member can expand and contract between the anchoring members, and along the inner peripheral surface thereof. Since joint material having a thickness in the radial direction of the joint that allows continuous pouring of secondary lining concrete from one side to the other side of the underdrain to be connected is provided between the anchoring members, the joint from one side of the underdrain It is possible to continuously pour secondary lining concrete on the other side of the underdrain along the inner peripheral surface of the material, and a predetermined width between the anchor anchor members of the secondary lining concrete thus cast Only by cutting off, a gap is formed between the underdrain to be connected, and a joint structure for connecting both underdrain is provided.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show one embodiment of a joint according to the present invention, FIG. 1 is a sectional view showing a completed joint, and FIG. 2 is a sectional view showing a state in which secondary lining concrete has been cast. Is.

This joint comprises a pair of underdrain 1, to be connected,
The end portions of a plurality of load bearing members 3 arranged circumferentially at intervals on the inner side walls 2a, 2a 'of the annular anchor members 2, 2'attached to the end face of 1'can be moved within a certain range. In addition, it is detachably inserted and connected, and the inner side walls 2a, 2a 'of the anchoring member are arranged outside the annular row of the plurality of load-bearing members 3, and the end portions are fixed between the anchoring members. The outer peripheral side and the inner peripheral side of the outer primary flexible water blocking member 4,
Watertight with a short tubular inner flexible waterproof member 6 arranged inside the annular row of the secondary outer flexible waterproof member 5 and the proof member 3 and having an end fixed between both anchor members. A cylindrical body 7 which is connected and is slightly shorter than the initial distance between both anchor members on the outer periphery of each load-bearing member 3.
Is loosely fitted.

Annular plates 8 and 8'are arranged on the inner peripheral sides of the anchoring members 2 and 2 ', and the inner side wall 2 of the anchoring members 2 and 2'.
a, 2a 'and outer side walls 2b, 2b' with nuts 9 and 9'welded at predetermined intervals in the circumferential direction, bolts 10,
It is fastened by 10 '.

Inner side walls 2a, 2a 'of the anchor members 2, 2'.
The joint material mounting plate 1 having an L-shaped cross section is provided at the inner peripheral side end of the
Reference numerals 1 and 11 'denote annular peripheral wall portions 11 extending in the axial direction of the joint.
a, 11a 'and annular side wall portions 11b, 11b' extending vertically from the peripheral wall portion.
The b'is fastened to the inner side walls 2a, 2a 'of the anchor members 2, 2'by bolts 13, 13' at predetermined intervals in the circumferential direction. 20 is a skin plate.

A short tubular joint material 12 is disposed in the space formed by the joint material mounting plates 11 and 11 ', and the peripheral wall portions 11a and 11a' and the side wall portions 11b and 1b and 1 are made of an adhesive.
It is bonded to 1b '. This joint material 12 prevents the secondary lining concrete from flowing into the space 14 where the flexible water blocking members 5 and 6 can expand and contract in the space between the anchor members 2 and 2'during the secondary lining. Doing and placing 2
This has a function of preventing the inner flexible water blocking member 6 from being damaged by the operation of the cutter in the step of cutting the next lining concrete by a predetermined width with the cutter. The joint material 12 has a radial thickness along which the secondary lining concrete can be continuously cast from one of the underdrains to the other along the inner peripheral surface thereof. As the joint material 12, foam rubber, sponge,
A material that is lightweight and has flexibility and elasticity such as Styrofoam is suitable.

Reference numerals 15 and 15 'are primary lining portions of the underdrains 1 and 1', and 16 and 16 'are secondary lining portions. A gap 17 is formed between the secondary lining portions 16 and 16 '.
7 is filled with a joint material 18 made of foamed rubber or the like for closing the same and a caulking material 19 for smoothing the inner circumferential surface of the underdrain.

Next, a method of constructing this joint will be described.
First, the center anchoring members 2, 2 ′ of the joint, the proof member 3, the primary outer flexible water blocking member 4, the second outer flexible water blocking member 5, the inner flexible water blocking member 6, and the tubular body 7 are assembled. The outer side wall 2b, 2b 'of the anchoring member is attached to each end surface of the primary linings 15, 15' consisting of the segments of the underdrain 1, 1'with bolts 21.

Next, the joint material mounting plates 11 and 11 'are attached to the inner peripheral side ends of the inner side surfaces 2a and 2a' of the anchor members 2, 2 ', and the joint material 12 is attached with an adhesive. Board 1
It is fixed to 1, 11 '.

Next, using a slide form machine, the secondary lining concrete 2 is continuously provided from one side of the underdrain 1, 1'to the other side of the underdrain along the inner peripheral surface of the joint as shown in FIG.
Place 2 In this case, unlike the conventional joint, even if the specified movement width of the slide foam machine ends in the middle of the anchor members 2, 2'of the joint, there is no framework that interferes with the slide foam machine, so that the joint part also slides. Secondary lining concrete can be placed sequentially for each specified moving width of the foam machine, and the secondary lining work can be performed extremely efficiently.

The allowable range of the radial displacement of the joint portion due to the variation in the excavation of the underdrain is a range indicated by D2, and the allowable range D in the conventional joint shown in FIG.
It is extremely larger than 1.

After the secondary lining concrete 22 is cast on the inner peripheral side of the joint in this manner, the center portion between the anchored members 2, 2'of the cast secondary lining concrete 22 is removed. The gap 17 is formed by cutting a predetermined width with a cutter. This gap 17 is necessary to allow relative displacement between the underdrains 1 and 1'due to ground fluctuation or the like.

Next, the joint material 18 and the caulking material 19 are filled in the gap 17 to complete the joint.

3 and 4 show another embodiment of the joint according to the present invention. FIG. 3 is a sectional view showing the completed joint.
FIG. 2 is a sectional view showing a state in which the secondary lining concrete has been cast.

This joint consists of a pair of underdrain 3 to be connected.
0, 30 'Ring-shaped anchoring members 31, 31' attached to the end faces
A water blocking member 33 made of incompressible rubber, synthetic resin or the like for primary water blocking is attached to the extended portions 32, 32 'on the outer peripheral side of the inner side walls 31a, 31a' of the anchoring members 31, 31 '. It is known that a flexible water blocking member 34 made of rubber, synthetic resin or the like for secondary water blocking is attached to the inner peripheral side of the. Short tubular bodies 35, 35 'are provided in contact with the intermediate portion 34a of the flexible water blocking member 34, and the abutting portions 35a, 35a' of the short tubular bodies 35, 35 'are provided.
And the inner side walls 31a, 31a 'of the anchoring members 31, 31' between the ends 34b, 34b 'of the flexible water blocking member,
The flexible water stop member 34 and the inner side wall 31 of the anchoring member 31, 31 'are fixed by tightening with the shrimp vise 36, 36'.
The water blocking property between a and 31a 'is improved.

An annular frame plate 37 is attached to the short tubular members 35 and 35 '.
37 ′ is fixed, and the inner peripheral side end portions of the frame plates 37, 37 ′ have corresponding frame plate insertion grooves 38 a, 38 of the joint material 38.
It is inserted in a'and fixed to the joint material 38 with an adhesive.

The joint material 38 is a short cylinder having the same structure and function as the joint material 12 of the embodiment shown in FIG. 1, and a part of the outer peripheral surface thereof is on the inner peripheral side of the shrimp vise 36, 36 '. Are in contact.

Reference numerals 39 and 39 'are primary lining portions of the underdrain 30, 30', and 40 and 40 'are secondary lining portions. A gap 41 is formed between the secondary lining portions 40 and 40 ′, and the gap 41 is filled with caulking material 42. In the figure, 44 is a skin plate.

Next, the construction method of this joint will be described.
First, the outer side wall 31b, 31b 'of the anchoring member except the intermediate joint material 38 and the caulking material 42 of the joint shown in FIG.
The bolts 43 are attached to the respective end faces of 9, 39 '.

Next, the joint material 38 is fixed to the frame plates 37, 37 'by filling the frame plate insertion groove 38a of the joint material 38 with an adhesive and inserting the frame plates 37, 37'.

Then, using a slide foam machine, a secondary lining concrete 46 is cast from one side of the underdrain 30, 30 'along the inner peripheral surface of the joint to the other side of the underdrain as shown in FIG.

Next, a cutting gap 41 is formed in a central portion between the second anchoring members 31, 31 'thus cast by a cutter with a predetermined width, and a caulking material 42 is filled therein. Complete the joint.

[0035]

As described above, according to the present invention, the joint material is used to prevent the secondary lining concrete from flowing into the space where the flexible waterproof member can expand and contract between the anchor members. There is a joint material with a thickness in the joint radial direction that allows continuous pouring of secondary lining concrete from one side to the other side of the underdrain to be connected along the inner peripheral surface. It is possible to continuously pour secondary lining concrete from one side of the underdrain to the other side of the underdrain along the inner peripheral surface of the jointing material. By cutting a predetermined width between the anchor members, a gap is formed between the culverts to be connected, and a joint structure for connecting both culverts is provided.

Therefore, even if the specified movement width of the slide foam machine ends in the middle of the anchoring members of the joint, there is no overhanging portion such as a frame that interferes with the slide foam machine, so that the secondary lining concrete also works in the joint portion. The secondary lining concrete can be placed sequentially for each specified movement width of the slide form machine without interrupting the placing of the pipe before and after the joint, and the secondary lining work can be performed extremely efficiently. .

Further, since the allowable range of the radial displacement of the joint portion caused by the variation in the excavation of the underdrain can be made extremely larger than that of the conventional joint, extremely high excavation accuracy is not required unlike the conventional joint, Standard excavation accuracy is sufficient, which can improve the efficiency of excavation work.

Furthermore, since there is no framework or the like that projects into the underdrain unlike the conventional joint, the slide form machine can be moved easily.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, showing a state in which a joint is completed.

FIG. 2 is a cross-sectional view showing a state when pouring of secondary lining concrete is finished in the example.

FIG. 3 is a cross-sectional view showing another embodiment of the present invention, showing a state in which the joint is completed.

FIG. 4 is a cross-sectional view showing a state when pouring of secondary lining concrete is completed in the example.

FIG. 5 is a sectional view showing an example of a conventional joint.

FIG. 6 is a sectional view showing another example of a conventional joint.

[Explanation of symbols]

 1, 1 ', 30, 30' Underdrain 2, 2 ', 31, 31' Anchoring member 5, 6, 34 Flexible water blocking member 12, 38 Joint material

Claims (2)

(57) [Claims] 1. An underdrain joint provided with a flexible tubular water blocking member provided between a pair of annular anchor members attached to end faces of a pair of underdrain to be connected. In the above, a short tubular joint material for preventing inflow of secondary lining concrete into the space where the flexible water blocking member can expand and contract ,
For placing secondary lining concrete from the inner surface to the inside
An underdrain joint characterized by being provided between the anchor members so as to form a space . 2. A pair of undercover primary lining end faces of a joint of a joint provided with a pair of annular anchor members, each of which comprises a flexible water blocking member in the form of a short tube, to which the anchor members are to be connected. the mounting step and,該碇wear short for preventing the flow of the secondary lining concrete of the movable Shiwatome water member into the space that can expand and contract between members
Put the tubular joint material inside from the inner peripheral surface to the secondary lining concrete.
Providing the space between the anchor members so as to form a space for placing a reet , and the other side of the underdrain to be connected from one side of the underdrain to be connected along the inner peripheral surface of the joint The step of continuously placing the secondary lining concrete on the inside, and by cutting the portion between the anchoring members in the placed secondary lining concrete by a predetermined width, between the underdrain to be connected. A method of constructing an underdrain joint, comprising the step of forming a gap.