JP2002339683A - Joint connecting structure of underground laying member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure of underground laying members suitable for a towing construction method for adding and laying adjacent long size elements, surely preventing biting-in of sediment between joints of the preceding and succeeding elements, surely and smoothly connecting the mutual adjacent elements, coping with lengthening of the elements, and capable of miniaturizing a grout plate installed on the joints. SOLUTION: The underground laying members 4 to 7 by projecting a plurality of joints 12 to 15, and 19 to 22 are adjacently arranged on the outside. Shielding members 26 are slidably installed on at least one side joint of the preceding laying member precedently laid on bedrock 1 among the mutually adjacent members. Engaging grooves 16 and 23 of the joints are shielded from the bedrock. The joints of the succeeding laying members 5 to 7 laid on the bedrock succeedingly to the preceding members are engaged with the shielding member. The shielding member is moved in the moving direction of the succeeding underground laying members. The joints of the succeeding members can be engaged with the joints of the preceding members. The tubular shielding member is slidably installed outside at least one side joint of the preceding members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for, for example, a traction method in which adjacent long elements are added and laid, and a tubular shielding member is completely mounted outside a joint of a preceding element, and a space between the joints of the front and rear elements is provided. In order to ensure that the adjacent elements are securely and smoothly connected to each other, the strength of the shielding member is enhanced, the breakage of the shielding member is prevented, and the element is made longer. On the other hand, the present invention relates to a joint connecting structure of an underground laying member capable of reducing the size of a grout plate attached to the joint.

[0002]

2. Description of the Related Art When building a crossing structure such as an underpass under a route, a plurality of square tubular elements, which are underground laying members provided with joints on the outside, are prepared as in, for example, Japanese Patent No. 2966665. Attach a drilling device to the tip of the element, penetrate it from the starting shaft side, pull it to the reaching shaft side via the PC steel wire, excavate the ground by the drilling device, and move the element by a predetermined distance. After penetration, connect the following element to the rear end,
While successive elements are successively added and a plurality of elements are laid in the pipe axis direction, a subsequent element is connected to the adjacent position of the element via the joint, and a subsequent element is sequentially laid on the element. And the said roadbed was protected.

[0003] In the method of laying the elements, the applicant has developed a means for preventing the excavated earth and sand from being mixed between the joints in order to smoothly connect the joints of the adjacent elements.
This is proposed in JP-A-2001-12200. The means is configured such that a closing member is previously fitted in a fitting groove of a joint of a preceding element, and after the preceding element is laid, a joint of a following element is engaged with the closing member and pulled, and the closing member is moved to a vertical shaft. Side, and the closing member replaces the joint of the following element.

However, since the closing member of the above means is made of synthetic resin, there is a fear that the closing member is deformed and broken by the earth pressure of the ground or bending or torsional stress acting on the member. In particular, this tendency became remarkable for a long element, and there was concern about construction using a long element as recently. Further, the above means attaches an expensive steel plate for preventing grout leakage to the ground side of the joint base of the preceding element and engages the steel plate with the joint of the following element, so that the steel plate becomes large. And so on.

[0005]

The present invention solves such a problem, and is suitable for, for example, a traction method in which adjacent long elements are added and laid, and a tubular shielding member is provided outside the joint of the preceding element. Completely installed, reliably prevent biting of excavated earth and sand etc. between the joints of the front and rear elements, securely and smoothly connect adjacent elements, strengthen the strength of the shielding member, prevent breakage It is another object of the present invention to provide a joint connecting structure for an underground laying member, which is capable of reducing the size of a grout plate attached to a joint while corresponding to an increase in the length of the element.

[0006]

According to a first aspect of the present invention, an underground laying member having a plurality of joints protruding outside is arranged adjacent to each other, and the adjacent underground laying members are connected to each other by a joint. And a shielding member is slidably mounted on a joint on at least one side of a preceding underground laying member that lays ahead of the ground, among the adjacent underground laying members, While engaging the joint of the following underground laying member, which is located behind the preceding underground laying member and laid in the ground, with the shielding member, and moves the shielding member backward. In an underground laying member joint connection structure in which the underground laying member is moved in the moving direction and the subsequent underground laying member can be engaged with the preceding underground laying member, at least one side joint of the preceding underground laying member Slidable tubular shielding member outside The conventional method of shielding a part of the joint is abolished, and the entire joint is completely stored in a shielding member to avoid contact or friction between the joint and the ground and earth pressure. In addition to preventing damage or breakage of the joints, soil and sand are reliably prevented from adhering to the joints, so that the joints of the underground laying members can be accurately and smoothly engaged. In this case, if the shielding member is made of, for example, steel pipe and its mechanical strength is enhanced, deformation or breakage due to earth pressure or bending or torsional stress during installation of the underground installation member can be prevented, and the recent underground installation member has It can correspond to lengthening.

According to a second aspect of the present invention, the joint is made engageable with the inner surface of the shielding member, so that the mounting position and movement accuracy and stability of the shielding member can be obtained. It tries to prevent deformation. According to the third aspect of the present invention, the shielding member is formed in a tubular shape, and the strength of the shielding member is enhanced, the sliding is facilitated, the configuration is simplified, and the shielding member can be easily and inexpensively manufactured. . In the invention of claim 4, a slit is formed in the peripheral surface of the shielding member in the axial direction, and the diameter of the shielding member can be increased or reduced through the slit, so that a certain degree of freedom can be obtained in the form of the shielding member. In addition, the shielding member is easily and smoothly mounted, and the shielding member can be smoothly moved when the underground laying member is laid.

According to a fifth aspect of the present invention, the slit is mounted on the base of the joint so as to be engageable so as to stabilize the mounting position and movement of the shielding member. The invention according to claim 6 enables the pair of engagement peripheral surfaces of the joint to be engageable with the inner surface of the shielding member, stabilizes the mounting position and movement of the shielding member, and prevents the deformation of the shielding member. I am trying to do it. According to a seventh aspect of the present invention, a socket tube protrudes from one end of the shielding member, and a subsequent shielding member is removably mounted on the protruding portion of the socket tube, and the preceding and subsequent shielding members are coaxially mounted. In addition to stably and accurately laying the underground laying member, the smooth movement and separation of the shielding member are enabled. The invention according to claim 8 is characterized in that the socket tube is formed short and small, a slit is formed in the peripheral surface of the socket tube in the axial direction, and the slit is formed at the same phase position as the slit of the shielding member. The degree of freedom of operation of the shielding member is ensured, and the socket tube can be smoothly mounted at a predetermined position of the joint.

According to a ninth aspect of the present invention, a plurality of shielding members are slidably and removably mounted outside at least one of the joints of the preceding underground laying member so as to reduce the size and weight of the shielding member. It is easy to handle, install, and recover, and easily adapts to the construction environment in small and complex shafts. In addition, compared to the case where the shielding member is integrally formed to be long, it can be manufactured reasonably and inexpensively to obtain compatibility between them, and when attached to the joint of the underground laying member, the degree of freedom between the shielding members can be increased. Therefore, the influence of the ground on the earth pressure and the like is reduced, and the sliding state is maintained.

[0010] In a tenth aspect of the present invention, a grout plate is protruded from a ground-side engaging edge of a joint of a subsequent underground laying member that engages with the shielding member, and a leading end of the grout plate is connected to a preceding underground laying member. The joint is arranged so that it can be engaged with the ground side peripheral surface, and it is possible to promote the realization of a method of attaching a tubular shielding member to the joint of the preceding underground laying member, and to reduce the size of the grout plate, and furthermore, the grout plate The engagement displacement is suppressed, and it is possible to easily manufacture with an inexpensive member without requiring a conventional expensive steel plate. The invention according to claim 11 is characterized in that a grout plate protruding from a joint of the following underground laying member is positioned inside the shielding member, thereby reducing the size of the grout plate and reducing the size of the grout plate when laying the underground laying member. I try to reduce the resistance.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a preferred embodiment of the present invention applied to the construction of a crossing structure such as an underpass below a route by a towing method. Substructure for railways, which is a ground structure
In the ground that has been created, on both sides of the ground 1 sandwiching the roadbed 2,
The starting shaft 3 and the reaching shaft (not shown), which are construction bases, have been cut.

A plurality of elements 4 to 7 as underground laying members are provided at the underpass construction positions inside the ground 1 in FIG.
Are arranged in a substantially rectangular shape as shown in FIG.
Numeral 7 penetrates sequentially from the starting shaft 3 side, adds subsequent elements 4 to 7 in the pipe axis direction, and connects adjacent elements 5 to 7 with joints described later.

Of these, the foremost elements 4 to 7 are connected to a digging device 8, so that succeeding elements 4 to 7 can be successively added behind the elements 4 to 7. The excavator 8 includes a cutter head and a screw auger (both not shown), excavates the ground 1 and allows the excavated earth and sand to be carried out to the starting shaft 3 side. A towing cable 9 is connected to the tip of the excavator 8, and the cable 9
Is linked to a towing jack (not shown) installed on the reaching shaft side, and is pulled to the reaching shaft side via the towing jack.

In the figure, reference numeral 10 denotes a plurality of tubular cutters with a bottom which are detachably attached to the rear end of the excavator 8.
The distal end of each joint described below can be inserted and removed. 1
Reference numeral 1 denotes a stand installed on the starting shaft 3 side, and elements 4 to 7
Can be placed.

The elements 4 to 7 are laid first on the ground 1 and serve as a construction reference, and a standard element 5 disposed adjacent to the reference element 4.
It has a corner element 6 arranged at a corner position of the installation section and an adjusting element 7 arranged between the standard elements 5.

The reference element 4 and the corner element 6 are formed by welding a plurality of plates made of a steel plate to a length of 850 m.
It is formed in a substantially rectangular tube having a width of 1035 mm. The reference element 4 includes a pair of frame plates 4 made of a steel plate.
a, 4b, 4c, 4d and the joint plates 4e, 4f, 3g, 3h are welded, and joints 12 to 15 are protruded from the corners thereof, that is, the ends of the joint plates 4e to 4h. I have.

The joints 12 to 15 are formed in a substantially C-shaped cross section, and open an engagement groove 16 having a substantially elliptical cross section outside thereof.
At the opening edge of the groove 16, engagement edges 17 and 18 are protruded inward,
An engagement projection 17a is provided outside the one engagement edge 17 to protrude.

The standard element 5 has a substantially U-shaped cross section of two opposing pieces of 1035 mm and a connecting piece of 850 mm.
a, 5b and 5c and a pair of joint plates 5d, 5e and 5f, 5g are welded, and joints 19 to 22 are protruded from the corners thereof, that is, the ends of the joint plates 5d to 5g. I have.

Each of the joints 19 to 22 is formed in a substantially C-shaped cross section which can be engaged with an adjacent joint, and has an engaging groove 23 having a substantially elliptical cross section outside thereof, and is engaged with an opening edge of the groove 23. Marriage 2
4 and 25 are protruded inward, and an engagement protruding portion 24a is protruded outside one of the engagement edges 24. The adjusting element 7 has a pair of joint plates that can be adjusted to expand and contract, and joints are provided on both sides thereof.

The joints of the elements 4 to 7 are configured to be mutually disengageable, and the engaging edges of the other joints are engaged with the engagement grooves with some margin, and the adjacent elements 4 to 7 are engaged. ~
7 can be connected. For example, in the reference element 4 and the standard element 5 in FIG. 7, the engagement edge 24 of the joint 19 is engaged with the engagement groove 16 with some margin, and the engagement of the joint 15 is engaged with the engagement groove 23. The edge 17 is engaged with some margin.

The elements 4 to 7 are provided with a plurality of protective tubes 26, which are shield members, having sufficient mechanical strength on all or some of the joints when the elements are laid.
That is, in the case of the reference element 4, all the joints 12 to
In the case of the other elements 5 to 7, similar protective tubes 26 are slidably mounted on the joints 21 and 22 of the adjacent following elements 5 to 7.

In the case of the embodiment, the protective tube 26 is constituted by a circular pipe made of a steel pipe and having the same diameter.
The outer peripheral portions of the pair of engagement edges of each of 5, 21 and 22 can be engaged, and the length thereof is approximately 1/4 of each of the elements 4 to 7.
It is formed to a length that is convenient for carrying and mounting work, and can be easily collected on the reaching shaft side.

A slit 27 is formed in the peripheral surface of the protective tube 26 along the axial direction, and the edge of the slit 27 is adapted to be engageable with the bases of the joints 12 to 15, 21 and 22. Through the slit 27, it can be elastically displaced in the diameter direction. A short and small socket tube 28 is attached to one end of the protective tube 26 by welding or the like, and the rear end of the tube 28 projects rearward of the rear end surface of the protective tube 26. The front end 26 is detachably mounted.

The rear end element 4 to 7 is connected to the rear end of the socket tube 28 by an adjacent head trailing element 5.
Of the protection tubes 2 of the preceding elements 4 to 7
6 can be sequentially pushed out to the arrival shaft side.

In the figure, reference numeral 29 denotes a slit formed on the peripheral surface of the socket tube 28, which is formed at the same phase position as the slit 27. Reference numeral 30 denotes a steel plate or an FRP grout plate attached to the tip of the ground 1 side engaging edge of the following element joint, which is formed in a substantially rectangular cross section, and the tip of which is related to the corresponding preceding elements 4 to 7. Then, the openings of the engaging grooves 16 and 23 that open to the ground 1 side are closed, and the engaging grooves 16 and 23 are closed.
The leakage of grout 31 such as cement milk or non-shrink grout material to be filled in can be prevented.

Reference numeral 32 denotes a steel plate or a FRP grout plate attached to the opposite side of the ground 1, that is, the front end of the inner side engaging edge of the preceding element joint, and is formed in a substantially O-shaped cross section. Engagement with the corresponding following elements 5 to 7 and closing of the openings of the engagement grooves 16 and 23 opening to the inner space side can prevent the grout 31 filling the engagement grooves 16 and 23 from leaking. I have to. In addition, reference numeral 33 in the drawing denotes a filling material such as a concrete or the like which is filled inside each of the elements 4 to 7 after the elements are laid.

In the joint connecting structure of the underground laying member configured as described above, the protection pipe 26 uses a general-purpose or used steel pipe, and the protection pipe 26 has a length of approximately 1 corresponding to the element 4 to 7.
／ To １ ／, cut to about 1 m, and slit 2
7 is formed along the axial direction. At one end of each protective tube 26, a socket tube 28 using a short-sized steel tube for general use or use is protruded and attached, and the peripheral surface thereof is in the same phase as the slit 27. A slit 29 is formed along the axial direction.

As described above, since each of the protective tubes 26 is provided with the socket tube 28 at one end and is configured substantially the same,
This can be manufactured reasonably and inexpensively, and their compatibility can be obtained. In addition, since the protection pipe 26 and the socket pipe 28 are made of steel pipe, the mechanical strength is higher than that of a conventional synthetic resin, and they can sufficiently withstand the earth pressure, bending or torsional stress during construction described later. In addition, since the protection tube 26 is approximately 1/4 to 1/5 the length of the elements 4 to 7 and is small and lightweight, it is easy to handle, mount and recover.

Further, since the grout plate 30 attached to the ground 1 side of the joint only needs to close the engaging grooves 16 and 23 opened to the ground 1 side, an expensive steel plate is used as in the prior art. Compared with a method in which this is engaged with a trailing joint to expand it, an inexpensive member is sufficient and the size can be reduced.

In addition, since the grout plate 30 is attached to the succeeding elements 5 to 7, the grout plate 30 is attached to the ground side of the preceding element, for example, and the protective tube 2 is provided outside the grout plate 30.
6, the joint between the joint and the grout plate can be more easily and reliably engaged than when the joint of the adjacent succeeding element is engaged with the socket tube and the joint is engaged with the grout plate.

Next, using the above laying method, the elements 4 to
When laying 7 and constructing an underpass under the route,
First, the first reference element 4 is placed on the gantry 11 of the starting shaft 3, the excavator 8 is connected to the tip, and a plurality of protective tubes 26 are sequentially mounted on the joints 12 to 15 at the four corners.

When the protective tube 26 is mounted, the protective tube 26 is sequentially inserted into the joints 12 to 15 from the rear of the reference element 4, slits 27 and 29 are inserted into the bases of the joints 12 to 15, and the rear portion is inserted into the socket tube 28. The protection tube 26 of the row is inserted and mounted. Therefore, reference element 4 has 4
Up to five protection tubes 26 are mounted. This situation is as shown in FIG. In this case, as described above, the protection tube 26 is formed at a length of about 1 m, which is approximately 1/4 to 1/5 of each of the elements 4 to 7, so that the protection tube 26 is smaller and lighter than an elongated one. The mounting work can be easily performed.

When a plurality of protective tubes 26 are mounted in this manner, the outer peripheral portions of the engaging edges 17 and 18 are engaged with the inner surface of the tube 26, and the opening edges of the slits 27 are connected to the bases of the joints 12 to 15. By engaging, the mounting position of the protection tube 26 is regulated, and the entire area of the joints 12 to 15 is completely accommodated inside the plurality of protection tubes 26.

In this manner, the tip of the first protective tube 26 is inserted into the over cutter 10 and the last protective tube 26 is inserted.
Projecting rearward of the reference element 4 from the socket tube 28 of
Appropriate retaining means such as fixing measures are applied to the rear end of each of the rearmost protective tubes 26.

Thereafter, the excavator 8 is positioned at a predetermined laying position of the reference element 4, and the towing cable 9 is connected to the excavator 8 through a guide hole (not shown), and the excavator 8 is driven. While excavating the ground 1, the towing jack 8 is operated to pull the excavating device 8 to the reaching shaft side and tow the reference element 4. This situation is as shown in FIG.

In this case, since the entire area of the joints 12 to 15 is completely accommodated in the protective tube 26 as described above,
The joints 12 to 15 are not subjected to the earth pressure of the ground 1, and the joints 12 to 15 are not scratched or damaged by the ground 1, and the earth and sand are not attached at all. In addition, each protection tube 26 is slightly reduced in diameter under the earth pressure of the ground 1,
The slit 27 is slightly reduced to prevent intrusion of excavated earth and sand from the slit 27. Moreover, since the protection pipe 26 is made of steel pipe, the protection pipe 26 has high mechanical strength, can sufficiently withstand the earth pressure, bending or torsional stress at the time of the construction, does not break or deform, and can be constructed with confidence.

Thus, the first reference element 4 is the ground 1
When the towing is completed, the operation of the excavator 8 and the towing jack is stopped. FIG. 4 shows the penetration state of the reference element 4 in this case. Thereafter, the succeeding reference element 4 is set on the gantry 11 and its front end is abutted against the rear end of the preceding reference element 4 slightly protruding from the ground 1, and these are connected via a bolt box (not shown) or the like. To connect. And the joint 1 of the following reference element 4
Attach the protection tube 26 to the pipes 2 to 15 as described above.
Is inserted into the socket tube 28 of the preceding reference element 4 and the rear end of the rearmost protective tube 26 is provided with a suitable retaining means as described above.

Thereafter, the operations of the excavator 8 and the towing jack are resumed, and the ground 1 is excavated, and at the same time, the excavator 8 is towed toward the reaching shaft, and the reference elements 4 and 4 are towed.
Also in this case, since the joints 12 to 15 of the reference elements 4 and 4 are completely housed inside the protective tube 26, the joints 12 to 15 receive the earth pressure of the ground 1 or rub against the ground 1, Is not attached at all, and the intrusion of excavated earth and sand from the slit 27 is prevented as described above. Moreover,
As described above, the protective tube 26 can sufficiently withstand the earth pressure, bending or torsional stress during construction and does not break or deform. Therefore, the work of laying the reference element 4 can be performed smoothly, promptly and safely.

When the leading and trailing reference elements 4 and 4 have thus penetrated the ground 1 and their towing has been completed, the operation of the excavator 8 and the towing jack is stopped, and the trailing reference element 4 is moved behind the leading reference element 4. The protection pipe 26 is attached to the joints 12 to 15 of the succeeding reference element 4 in the above-described manner, and the distal end of the pipe 26 is inserted into the socket pipe 28 of the preceding reference element 4.

Then, the operations of the excavator 8 and the towing jack are resumed, the ground 1 is excavated, the excavator 8 is towed toward the reaching shaft, and the reference elements 4 and 4 are towed and laid. Thereafter, the reference elements 4 are sequentially added, and when a predetermined number of the reference elements 4 have been added, a series of laying work of the reference elements 4 ends. Thereafter, the excavator 8 and the towing jack are removed, the towing jack is installed at the next construction position on the reaching shaft side, the first standard element 5 is placed on the gantry 11, and the excavating device 8 is connected to the tip thereof. I do.

The joint 19 of the standard element 5
, A plurality of protective tubes 26 are attached to the joints 21 and 22 at positions opposite to the laid reference element 4 in the above-described manner, and the protective tubes 26 are attached to the reference element 4 side, that is, to the joints 14 and 15 of the reference element 4. No protective tube 26 is attached to the joints 19 and 20 to be connected. Therefore, the joint 1
The overcutters 10 at positions 9 and 20 are removed, and the rear end of the protection tube 26 at the last position is provided with a suitable retaining means as described above.

Under such circumstances, the excavator 8 is positioned at a predetermined laying position adjacent to the side of the reference element 4, the towing cable 9 is connected to the excavator 8, and the excavator 8 is connected. While driving and excavating the ground 1, the towing jack is operated to tow the excavator 8 and the standard element 5 toward the reaching shaft.

When the excavator 8 and the standard element 5 penetrate the ground 1 by a predetermined distance, the joints 19 and 20 of the standard element 5 engage with the socket tube 28 at the last position of the last reference element 4 in the last row. . This situation is as shown in FIGS. Therefore, the engaging force is transmitted to the preceding protection tubes 26 engaged with each other, and these protection tubes 26 move at the same time, and the foremost protection tube 26 is moved by the movement of the standard element 5 to the arrival shaft side. It is pushed out to.

When the socket tube 28 at the last position penetrates the ground 1, the joints 19, 2 of the standard element 5 are connected.
0 is engaged with the joints 15 and 14 of the reference element 4 at the last position, and the joint 1 is inserted into the engagement groove 16 of the joints 15 and 14.
The engagement edges 24, 24 of the joints 9, 20 engage and the joints 19,
20 are engaged with the engaging edges 17 of the joints 15 and 14,
17 is involved.

The tip of the grout plate 30 attached to the engaging edge 25 engages with the bases of the joints 15 and 14, and the ground 1
The opening of the engagement groove 23 opened to the side is closed and the groove 23 is closed.
The excavated earth and sand from entering. On the other hand, at the position of the standard element 5 opposite to the reference element 4, the mounted protective tube 26 penetrates the ground 1 as described above.

In this way, the excavator 8 excavates, the leading standard element 5 penetrates the ground 1, and when the towing is completed, that is, the protective tube 26 attached to the rear end of the rearmost reference element 4 is moved to the front end. Of the standard element 5 of the first standard element 5 and pushes the adjacent preceding protective tube 26 forward, and instead, the joint 1 of the first standard element 5
9, 20 are the joints 15, 1 of the last reference element 4
At the time of engagement with 4, the operation of the excavator 8 and the towing jack is stopped.

In this case, the socket tube 28 of the last protective tube 26 and the joints 19, 2 of the standard element 5 at the top.
0 indicates that the engaged state is maintained inside the ground 1. In addition,
The protection tube 26 attached to the forefront reference element 4 is sequentially pushed out to the reaching shaft side and collected.

Next, the succeeding standard element 5 is set on the gantry 11 and its front end is abutted against the rear end of the preceding standard element 5 slightly protruding from the ground 1, and these are bolted (not shown) or the like. Connect via Then, a plurality of protective tubes 26 are attached to the joints 21 and 22 of the succeeding standard element 5 in the above-described manner, and the leading protective tube 26 is inserted into the socket tube 28 of the preceding standard element 5, and the last protective tube 2 is inserted.
6 is provided with the above-mentioned retaining means at the rear end. Also, joints 19, 20 connected to the joints 14, 15 of the reference element 4
, The protective tube 26 is not attached.

Under these circumstances, the operation of the excavator 8 and the towing jack are resumed, the ground 1 is excavated, and at the same time, the excavator 8 is towed toward the reaching shaft, and the standard elements 5, 5
Tow. In this way, the last protective tube 26 attached to the trailing joint of the reference element 4 is pushed by the joints 19 and 20 of the first standard element 5, and the joints 19 and 20 are moved forward by the front reference element 4. Fittings 15, 14
Engages.

Also, the joints 19 and 20 of the connected standard elements 5 and 5 engage with the joints 15 and 14 of the reference elements 4 and 4 at the rear, and the traction portion of the standard element 5 is pulled. The protection tube 26 attached to the trailing joint of the forefront reference elements 4 and 4 is pushed out toward the reaching shaft. That is, by pulling the standard element 5, the protective tubes 26 attached to the trailing joints of the reference elements 4 and 4 are sequentially extruded, and the joints 19 and 20 of the standard element 5 are extended by the pushing amount. Engage with the joints 15, 14 of the element 4.

Under these circumstances, each protective tube 26 is connected to the engaging edges 17, 18 of the reference element 4 and to the joint 14,
15, and slides around the joints 14, 15 through the expansion and contraction of the slit 27 against changes in the earth pressure, bending, or torsional stress of the ground 1. , Avoid excessive contact with each of the engaging portions and maintain the sliding state. In this case, each protection tube 26 is divided into short and small parts,
Since the sockets 28 are connected to each other with a certain degree of freedom, the influence of the earth pressure of the ground 1 and the like can be reduced as compared with the case where the protection tube 26 is integrally formed in a long length. Effective for maintenance. Therefore, this kind of laying operation can be facilitated and the life of the protection tube 26 can be improved.

At this time, the protection tubes 26 attached to the trailing joints 21 and 22 of the standard elements 5 and 5 are connected coaxially via the socket tubes 28 and regulate the movement position of the standard elements 5 relative to each other. To encourage their accurate and stable movement.

Thereafter, the standard elements 5 are sequentially added,
The protection tube 26 attached to the trailing joint of the reference element 4 is sequentially extruded, and the joints 19 and 20 are replaced with the joints 15 and 1 instead.
When the engagement with the reference element 4 is completed, a series of laying work of the standard element 5 adjacent to the side of the reference element 4 is completed. In this case, since the protection tube 26 is smaller and lighter than the one in which the protection tube 26 is formed integrally and long, the protection tube 26 can be easily handled, mounted and collected from the reaching shaft side, and the starting shaft 3 And working space for reaching shaft
Can be easily adapted to work environments and complex work environments.

This situation is as shown in FIG. 8. All the protection tubes 26 attached to the trailing joint of the reference element 4 are pushed out and removed, and the trailing joints 14, of the reference element 4 are removed.
At 15, the leading joints 20 and 19 of the standard element 5 are engaged. Also, the trailing-side joint 21 of the standard element 5,
A protection tube 26 attached to the joint 22 is coaxially attached via each socket tube 28.
The grout plate 30 attached to the side closes the openings of the engaging grooves 23 and 16 opened to the ground 1 side.

After that, the excavator 8 and the towing jack are removed, the towing jack is set at the next construction position on the reaching shaft side, the excavating device 8 is connected to the first standard element 5, and then the connecting joints 21 and 22 are connected. A plurality of protection tubes 26 are mounted in the above-described manner, the above-mentioned retaining means is provided at the rear end of the rearmost protection tube 26, and the excavator 8 is dug. Are successively added.

Hereinafter, all the elements 4 to 4 are operated in the same manner.
When the grout plate 32 is attached to the inner edge of each of the elements 4 to 7 and the grout plate 32 is
Is filled with a filler material 31 such as cement milk or a non-shrinkable grout material.
And filling material 33 such as And the filling materials 31 and 3
Ground 1 surrounded by the elements 4 to 7 after the solidification of 3
Is excavated, the inner surface thereof is formed, and the construction of a predetermined underpass is completed. This situation is as shown in FIGS.

[0057]

As described above, according to the first aspect of the present invention, since a tubular shielding member is slidably mounted on the outside of at least one joint of the preceding underground laying member, a part of the joint is shielded. Abolish the conventional method, and completely store the entire joint with a shielding member, thereby avoiding contact or friction between the joint and the ground and earth pressure, and preventing damage or breakage of the joint, Adhesion of earth and sand to the joints can be reliably prevented, and the joints of the underground laying members can be reliably and smoothly engaged. In addition, if the shielding member is made of, for example, steel pipe and its mechanical strength is enhanced, deformation or breakage due to earth pressure or bending or torsional stress when laying the underground laying member can be prevented. It can respond to scaling.

According to the second aspect of the present invention, since the joint can be engaged with the inner surface of the shielding member, it is possible to obtain the mounting position and the movement accuracy and stability of the shielding member, and to shield the earth due to earth pressure or the like. Deformation of the member can be prevented. According to the third aspect of the present invention, since the shielding member is formed in a tubular shape, it is possible to improve strength, facilitate sliding, and simplify the configuration as compared with the shielding member having an irregular cross-section, and to simplify and improve the structure. It can be manufactured at low cost. The invention according to claim 4 is characterized in that a slit is formed in the peripheral surface of the shielding member in the axial direction,
Since the diameter of the shielding member can be increased or reduced through the slit, a certain degree of freedom can be obtained in the form of the shielding member, the shielding member can be easily and smoothly attached to the joint, and when the underground laying member is laid. The movement of the shielding member in can be performed smoothly.

According to the fifth aspect of the present invention, since the slit is mounted so as to be engageable with the base of the joint, the mounting position and movement of the shielding member can be stabilized. According to the invention of claim 6, since the pair of engaging edge peripheral surfaces of the joint can be engaged with the inner surface of the shielding member, the mounting position and movement of the shielding member can be stabilized, and the deformation of the shielding member can be achieved. Can be prevented. According to a seventh aspect of the present invention, a socket tube is protruded from one end of the shielding member, and a succeeding shielding member is detachably attached to the projecting portion of the socket tube. The underground laying member can be stably and accurately laid, and the shielding member can be easily moved and separated easily.

According to the invention of claim 8, the socket tube is formed to be short and short, and a slit is formed in the peripheral surface of the socket tube in the axial direction, and the slit is formed at the same phase position as the slit of the shielding member. In addition, the degree of freedom of operation of the shielding member by the socket tube is ensured, and the socket tube can be smoothly mounted at a predetermined position of the joint. The invention according to claim 9 is that the outer side of the joint on at least one side of the preceding underground laying member,
Since a plurality of shielding members are slidably and detachably mounted, the shielding members can be reduced in size and weight, and their handling, installation and collection can be performed easily. It can be easily handled.
In addition, compared to the case where the shielding member is integrally formed into a long length, it can be manufactured reasonably and inexpensively, and their interchangeability can be obtained. It is possible to reduce the influence of the ground on the earth pressure and the like, and maintain the sliding state.

According to a tenth aspect of the present invention, a grout plate is protruded from a ground-side engaging edge of a joint of a subsequent underground laying member which engages with the shielding member, and a leading end of the grout plate is connected to a preceding underground laying member. Is arranged so as to be able to engage with the ground surface side peripheral surface of the joint, so that the method of mounting the tubular shielding member to the joint of the preceding underground laying member can be realized, and the grout plate can be downsized. Can be easily manufactured with an inexpensive member without requiring a conventional expensive steel plate. The invention according to claim 11 is characterized in that a grout plate protruding from a joint of the following underground laying member is positioned inside the shielding member so that the grout plate can be downsized, and the grout plate is laid when the underground laying member is laid. Resistance can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view in which the present invention is applied to the construction of an underground structure under a route, and shows a state immediately after all elements as underground laying members have penetrated into a ground.

FIG. 2 is an enlarged cross-sectional view showing a main part of FIG. 1, showing a connection state of a joint between an adjacent preceding reference element and a succeeding standard element.

FIG. 3 is a cross-sectional view showing a construction state according to the present invention, showing a laying state of a leading reference element.

FIG. 4 is an enlarged sectional view showing a situation immediately after the reference element is laid according to the present invention.

FIG. 5 is an enlarged longitudinal sectional view showing a state immediately after installation of each reference element according to the present invention, and shows a mounting state of each shielding member.

FIG. 6 is a perspective view showing a situation in which a joint of an adjacent succeeding standard element is engaged with a socket tube of a shielding member attached to a rearmost reference element applied to the present invention.

FIG. 7 is an enlarged sectional view showing an engagement state between joints of adjacent elements applied to the present invention, and shows an engagement state between joints between a reference element and an adjacent succeeding standard element.

FIG. 8 is an enlarged cross-sectional view showing the situation immediately after the reference element according to the present invention and the adjacent succeeding standard element are laid.

FIG. 9 is an enlarged sectional view showing a state in which a filler is filled in the engagement grooves after the reference element according to the present invention and the adjacent succeeding standard element are laid.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ground 4 Underground installation member (reference element) 5 Underground installation member (standard element) 6 Underground installation member (corner element) 7 Underground installation member (adjustment element) 12-15 Joint 19-22 Joint 16,23 Engagement Grooves 17, 18, 24, 25 Engagement edge 26 Shielding member (protective tube) 27, 29 Slit 28 Socket tube 30 Grout plate

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasuhiro Ito 2-3-5 Misaki-cho, Chiyoda-ku, Tokyo Iron Construction Corporation Co., Ltd. (72) Inventor Yasuo Yamamura 2-53-3 Misaki-cho, Chiyoda-ku, Tokyo No. Tetsuken Construction Co., Ltd. (72) Inventor Tadao Suzuki 2-5-3 Misakicho, Chiyoda-ku, Tokyo Tetsuku Construction Co., Ltd. F-term (reference) 2D054 AD37 2D055 BA03 KB04

Claims (11)

[Claims] An underground laying member having a plurality of joints protruding outward is arranged adjacent to each other, and the adjacent underground laying members are connected to each other by engaging their joints, and the adjacent underground laying members are connected to each other. Among the laying members, a shielding member is slidably mounted on at least one side of a joint of the preceding underground laying member that lays ahead of the ground, and shields the engagement groove of the joint from the ground, A joint of a trailing underground laying member to be laid in the ground after the underground laying member is engaged with the shielding member, and the shielding member is moved in a moving direction of the trailing underground laying member, and the trailing underground laying is performed. In the joint connecting structure for an underground laid member in which the joint of the member is engageable with the joint of the preceding underground laid member, a tubular shielding member is slidably mounted outside at least one joint of the preceding underground laid member. Joints for underground laying members Connection structure. 2. The joint connecting structure for an underground laying member according to claim 1, wherein the joint can be engaged with an inner surface of the shielding member. 3. The joint connecting structure for an underground laying member according to claim 1, wherein said shielding member is formed in a circular tubular shape. 4. The joint of an underground laying member according to claim 1, wherein a slit is formed in a peripheral surface of the shielding member in an axial direction, and the diameter of the shielding member can be increased or reduced through the slit. Connection structure. 5. The joint connecting structure for an underground laying member according to claim 1, wherein said slit is mounted to be engageable with a base of said joint. 6. The joint connecting structure for an underground laying member according to claim 1, wherein a pair of engaging edge peripheral surfaces of said joint can be engaged with an inner surface of said shielding member. 7. The joint connecting structure of an underground laying member according to claim 1, wherein a socket pipe is protruded from one end of the shielding member, and a subsequent shielding member is detachably attached to the protruding portion of the socket pipe. 8. The socket tube is formed to be short and small, and a slit is formed in a peripheral surface of the socket tube in an axial direction.
The joint connection structure for an underground laying member according to claim 4 or 7, wherein the slit is formed at the same phase position as the slit of the shielding member. 9. The joint connecting structure for an underground laying member according to claim 7, wherein a plurality of shielding members are slidably and detachably mounted outside a joint on at least one side of the preceding underground laying member. 10. A grout plate protrudes from a ground-side engaging edge of a joint of a subsequent underground laying member that engages with the shielding member, and a tip end of the grout plate is grounded to a joint of the preceding underground laying member. The joint connecting structure for an underground laying member according to claim 1, wherein the joint connecting structure is arranged so as to be engageable with a peripheral surface. 11. The joint connecting structure for an underground laying member according to claim 8, wherein a grout plate protruding from a joint of the subsequent underground laying member is positioned inside the shielding member.