JP2003064987A - Open shield tunneling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an open shield tunneling method which is available when open channel members are embedded in the ground, and can avoid deformation or breakage of the open channel members at the time of back-filling of the same. SOLUTION: According to the open shield tunneling method, a cycle comprised of a connecting step of connecting the open channel members of one unit together in an inner space of an open shield machine, and an advancing step of advancing the open shield machine according to the length of the open channel members of one unit, which are connected together in the connecting step, is carried out once or twice. Then, after completion of the cycle, a back-filling step of back-filling the open channel members arranged on the rear of the open shield machine which has advanced in the advancing step is carried out. In this manner by repeatedly carrying out the cycle once or twice and the back-filling step, the open channel members of the plurality of units are connected and buried. According to the method, at least one of the open channel members back-filled in the back-filling step, has a displacement restraining means on a side wall thereof, for restraining the side wall from being displaced at least by a predetermined amount toward the interior of the open channel member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses an open shield machine to form a U-shaped open water channel block (in a cross section perpendicular to the longitudinal direction, a pair of side surfaces facing each other rising upward from both ends of the bottom surface). It has the shape of a katakana "U" rotated 90 degrees or the shape of the alphabet "U") or L-shaped assembled open channel block (cross section perpendicular to the longitudinal direction). In addition, it has a side surface that rises upward from one end of the bottom surface and has a shape like the letter "L" of the alphabet, and a pair of this is arranged on both sides of the water channel.)
The open shield construction method of burying an open drain member such as the like in the soil, and more specifically, a connecting step of connecting one unit of the open drain member in the internal space of the open shield machine and the one unit connected in the connecting step. And a forward step of advancing the open shield machine according to the length of the open conduit member, and the open shield machine is advanced in the forward step after one or more cycles are completed. The present invention relates to an open shield construction method in which a plurality of units of open channel members are buried while being connected by repeating a backfilling step of backfilling the open channel members located at the rear.

[0002]

2. Description of the Related Art In order to bury underground structures such as water and sewer pipes and box culverts, an open shield method using an open shield machine has been widely used.
The open shield method is to embed a towed or self-propelled open shield machine in the soil, connect underground structures in the internal space of the open shield machine, and direct the earth and sand forward by an excavator. By excavating and advancing the open shield machine in sequence, the underground structure located behind the open shield machine is backfilled (earth and sand or mortar is often used). The underground structure can be continuously buried. Many applications have already been filed for the open shield construction method, open shield machine, and the like, and a detailed description thereof will be omitted. For example, Japanese Patent Application Publication No. 133294 of 1987 and Japanese Patent Application Publication No. 169914 of 1991.
Detailed explanations are given in the issues.

[0003]

However, in the above-mentioned open shield construction method, when the underground structure located behind the open shield machine is backfilled, the backfilled underground structure is backfilled. In the case where the underground structure is deformed or severely affected by the pressure of the generated earth and sand or mortar, there is a possibility of destruction. The pressure exerted on the underground structure by the backfilled soil or the like may have an unexpected magnitude particularly when backfilling (for example, the soil and sand are vigorously fed toward the underground structure. In such a case), the possibility of deformation or destruction of the underground structure at the time of backfilling has been a serious problem. Further, the possibility of deformation or destruction of the underground structure at the time of backfilling is considered to be due to the open drain member (such as the buried U-shaped open channel block or the L-shaped open channel block in which a pair is assembled). If it has an opening facing upward in the vertical plane cross section, the strength against external stress is smaller than that of a member having a closed structure in the vertical plane cross section, which is a serious problem. .

Therefore, in the present invention, when an open drain member such as the above-mentioned U-shaped open channel block or L-shaped assembled open channel block in which a pair is assembled is buried in the soil by the open shield method, it is buried. An object of the present invention is to provide an open shield construction method capable of avoiding deformation and destruction of the open-ditch member at the time of returning.

[0005]

The open shield construction method of the present invention (hereinafter referred to as the "main construction method") includes a connecting step for connecting one unit of open channel members in the internal space of the open shield machine, and the connecting step. The connected one
A cycle comprising an advancing step of advancing the open shield machine according to the length of the open channel member of the unit;
By repeating the backfilling step of backfilling the open channel member located behind the open shield machine advanced in the forward step after completion of one or more of the cycles, a plurality of open channel members can be formed. An open shield method of burying while connecting, wherein at least one of the open channel members to be backfilled in the backfilling step has a side wall at least at an inner side of the open channel member. This is an open shield construction method characterized in that displacement limiting means for limiting displacement above a certain amount is attached.

[0006] In this method, the open shield is connected according to the connecting step of connecting one unit of the open conduit member in the internal space of the open shield machine and the length of the one unit of the open conduit member connected in the connecting step. A cycle comprising a forward step of advancing the machine, and a backfill step of backfilling the open channel member located behind the open shield machine advanced in the forward step after completion of one or more of the cycles. By repeating,
This is an open shield construction method in which a plurality of open channel members are connected and buried. That is, in one cycle, the connecting step of connecting one unit of the open-drain member in the internal space of the open shield machine and the connecting step in the connecting step.
And a forward step of advancing the open shield machine according to the length of the open channel member in units, so that one unit of the open channel member is connected each time one cycle is completed, and the open shield machine also moves forward accordingly. Do it. Therefore, by repeating the cycle, a plurality of units of open channel members are continuously laid and laid in the soil. Then, after one or more of the cycles are completed, a backfilling step of backfilling the open channel member located behind the open shield machine advanced in the forward step is performed, thereby laying in the soil by the cycle. The opened open channel member can be backfilled. As described above, the cycle and 1 or 2
A backfill step after the above cycle is completed,
By repeating the above, a plurality of units of open drain members are laid in the soil in a continuously connected state, and the laid open drain members can be backfilled. It can be buried while being buried. In addition, even if the backfill step is performed after the completion of one cycle as described in “Here, the backfill step after the completion of one or more of the cycles”, And the backfilling step of 1 is performed.) The backfilling step may be performed after two or more (plural) of the cycles are completed (a plurality of connecting steps and the After the multiple forward steps are performed, one backfill step is performed).

Further, in this method, the side wall of at least one of the open channel members to be backfilled in the backfill step is displaced at least a predetermined amount in the inward direction of the open channel member. Install displacement limiting means to limit. That is, a displacement limiting means is attached to a side wall of at least one of the open channel members to be backfilled in the backfill step, the displacement limiting means for limiting the displacement of the side wall in the inner direction of the open channel member by at least a predetermined amount or more. Therefore, the side wall of the open channel member that is backfilled in the backfilling step by the attached displacement limiting means is
Displacement of at least a predetermined amount in the inward direction is restricted. Therefore, when burying the open channel member such as a U-shaped open channel block or an L-shaped assembled open channel block in which a pair is assembled in the soil by the open shield method, The sidewall of the open channel member is applied with pressure of the backfilled earth and sand or mortar (the backfilled earth and sand and mortar exerts a force on the side wall toward the inside of the open channel member). Since the displacement restricting means restricts displacement inward by a predetermined amount or more, it is possible to prevent the open drain member from being deformed or destroyed by a predetermined amount or more at the time of backfilling.

Any material that can be backfilled in the backfilling step (backfilling material) may be used as long as it can backfill the open channel member, and is not particularly limited. ,concrete,
Mortar etc. can be illustrated. Further, the “side wall” refers to a portion that rises upward from the bottom portion in a cross section perpendicular to the direction in which the open conduit member is connected. And, the "displacement limiting means" may be any as long as it can limit the displacement of the side wall in the inward direction of the open part member by at least a predetermined amount or more, but is not particularly limited, for example, Even if the side wall is not displaced inward of the open channel member, the side wall is in contact with the side wall from the inside direction, or if the side wall is not displaced inward direction of the open channel member, the side wall is moved from the inside direction. Although not in contact with the side wall, the side wall comes into contact with the side wall from the inner side when the side wall is displaced to the inner side to some extent. Further, in the present specification, “front” means a direction in which the open shield machine advances, and “rear” means a direction opposite to “front”.

The method further comprises a pressing and hardening step of pressing and hardening the backfill material backfilled by the backfilling step, and at least the displacement limiting means is attached to an open channel member which receives a pressure generated by the backfilling step. May be. The backfill material backfilled by the backfill step is soft as it is, and it may not be possible to fix the position of the open-ditch member or place a heavy object on the upper surface of the backfill material. So
It is preferably compacted (compacting step).
However, when the backfill material is compacted in the compaction step, the pressure that displaces the side surface of the open channel member inward of the open channel member (that is, the pressure that pushes the side surface from the outside to the inside) is applied to the side surface. . For this reason, when the compaction step is performed, the force for displacing the side surface of the open channel member inward of the open channel member is increased as compared with the case where it is not performed (deformation of the open channel member or It is preferable that at least the displacement limiting means is attached to the open-ditch member that receives the pressure generated by the compaction step.

The open shield machine performs the compaction step so as to compact the front end of the backfilled backfill material toward the rear, and the forward step due to the forward reaction force generated by the compaction step. In addition, at least the displacement limiting means may be attached to one unit of the open-drain member in contact with the front end. The open shield machine performs a compaction step so that the front end of the backfilled backfill material is compacted backward, and the forward step generated by the forward reaction force generated by the compaction step is achieved. In order to do so, the open shield machine has a configuration in which the front end of the backfill material located behind the open shield machine is pressed backward (that is, the front end of the backfill material is pressed backward). It is convenient to carry out the compaction step and the forward step with such a configuration (note that such an open shield machine is known, and is described in, for example, 1993 Utility Model Application Publication No. 21538). ing.). Then, if such an open shield machine is used, the largest compaction force acts on the front end of the backfilled material that has been backfilled, and along with that, the side surface of the openback member near the front end is the inside of the openback member. Since the greatest force that displaces in the direction acts (deformation or breakage of the open channel member is likely to occur),
It is preferable that at least the displacement limiting means is attached to one unit of the open-drain member with which the front end is in contact.

The open shield machine performs the compaction step so as to compact the front end of the backfilled material, which is backfilled, toward the rear side, and the forward step generated by the forward reaction force generated by the compaction step. When at least the displacement limiting means is attached to one unit of the open channel member with which the front end is in contact, the open channel member is located in front of the unit of the open channel member with which the front end is in contact. In addition to being arranged, the displacement limiting means is attachable to and detachable from the open-ditch member, and the backfilling step and the compacting step are performed for one cycle, and the cycle and the backfilling step are performed. When the above is completed, one unit of the open drain member in contact with the front end and an open drain member in front of the unit of open drain member in contact with the front end , The and displacement limiting means is attached, then the cycle or subsequent 1 or 2
By the time the above cycle is completed and before the next compaction step is performed, the displacement limiting means is removed from one unit of the open drain member which the front end is in contact with or the open drain member present behind the open drain member. Further, the displacement limiting means may be attached to the open channel member in front of the 1-unit open channel member with which the front end is in contact. First, when the backfilling step is completed in a certain cycle and immediately after that cycle (before entering the next cycle), one unit of open channel member with which the front end contacts and one unit of open channel member with which the front end contacts The displacement limiting means is attached to the open-ditch member at the front. After that, the certain cycle or the following 1
Or two or more cycles are complete (ie, when the one cycle is complete, when the next cycle following the one cycle is complete, or when two or more cycles following the one cycle are complete). ) And before the next compaction step is performed, the displacement limiting means is detached from one unit of the open drain member which the front end is in contact with or the open drain member located behind the open drain member, and the removed displacement limit Since the means is attached to the open conduit member in front of one unit of the open conduit member with which the front end is in contact, the work can proceed smoothly if there are at least two displacement restricting means (the displacement restricting means is operated. To change (while alternating)
By using the unit, the displacement limiting means is removed from the one unit of the open drain member which is in contact with the front end or the open drain member which is behind the open unit, and the removed unit of open drain which is in contact with the front end is one unit of the open drain member. The work of attaching to the open-ditch member in front of can be performed at the same time while performing the compaction step and the backfilling step, and the progress of this method may not be delayed by the time of the operation, or Can also make it smaller. ).

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to these.

Here, the above-mentioned L-shaped assembled open water channel block (which has a side wall rising from one end of the bottom surface upwardly in a cross section perpendicular to the longitudinal direction) using this construction method is used. An example of a construction method of burying an open channel by arranging a pair of them on both sides of the channel to form an open channel will be described. FIG. 1 is a cross-sectional view showing the first step of the present construction method (cut by a vertical plane passing through the approximate center in the width direction of the open shield machine), and FIG. 2 shows the first step of the present construction method. 1 is a plan view (shown as seen from the direction of arrow A in FIG. 1. The backhoe 101 shown in FIG. 1 is not shown). Further, in order to facilitate the illustration and understanding of both drawings, the illustration of parts that are not directly related to the present invention or known parts is omitted or simplified.
In the first step of this construction method, as shown in FIGS. 1 and 2, a backhoe 101 is used to dig a buried hole for burying the open shield machine 11 in the ground, and the open shield machine 11 is lowered into the buried hole. Then, the open shield machine 11 is arranged inside the buried hole. Although not shown here, the open shield machine 11 is provided with a device similar to that shown in Japanese Patent Application Publication No. 133294 of 1987, and the open shield machine 11 is installed in the buried hole by the device. It is capable of self-falling and self-climbing from the buried hole.

Further, here, the open shield machine 11 is used.
Uses an open shield machine similar to the open shield machine described in the embodiment of 1993 utility model application publication No. 21538 previously filed by the present applicant. Specifically, the front frame 1 and the tail frame 2 are in the front-back direction (in FIGS. 1 and 2, the front direction is indicated by an arrow F, the rear direction is indicated by an arrow B, and
Shown respectively. ) Are slidably attached to each other, and a propulsion jack 3 is attached between the front frame 1 and the tail frame 2 (see FIG. 2 in particular).
Please refer to. ). For this reason, when the propulsion jack 3 is extended, the space between the front frame 1 and the tail frame 2 extends, so if there is sediment (for example, backfilled one) behind the open shield machine 11, the front end of the sediment is moved backward. The front frame 1 moves forward due to the forward reaction force generated by the pressing and
Next, when the propulsion jack 3 is contracted, the tail frame 2 moves forward, and then the earth and sand are backfilled behind the open shield machine 11, and the propulsion jack 3 is extended again,
The front end of the earth and sand is pressed backward, and the front frame 1 advances again due to the forward reaction force generated by the pressing. In this way, by repeating the steps of extending the propulsion jack 3 (compacting the rear soil and compacting the front frame 1), contracting the propulsion jack 3 (advancing the tail frame 2), and backfilling the rear sediment. The open shield machine 11 can be moved forward while compacting the soil behind the open shield machine 11. However, any open shield machine may be used in the present construction method and is not limited to the same one as the above-mentioned open shield machine 11 or the like, and for example, in 1991 Patent Application Publication No. 169914. It may be any of the several types described in the examples.

In the state shown in FIGS. 1 and 2, as a second step of the present method, the earth floor surface located in the internal space 13 of the open shield machine 11 is leveled (floor leveling), and then the foundation portion is formed. FIG. 3 is a C-C end view of FIG. 2, and is a view for explaining the structure of the basic portion. The basic part will be described with reference to FIG. As described above, the crushed stones 113 are laid on the soil floor surface 111 (leveled) which is positioned in the internal space 13 of the open shield machine 11,
Furthermore, P is put in a predetermined position so as to be buried on the upper surface of the crushed stone 113.
A C plate 115 (the “PC plate” means a precast concrete plate) is provided. In this way, the basic portion as shown in FIG. 3 is formed. The PC board 1
15 is an L-shaped assembly open channel block 2 to be described later on its upper surface.
Since 1 and 23 are placed, the L-shaped assembled open channel blocks 21 and 23 are buried at positions corresponding to desired positions.

Then, after disposing the crushed stones 113 and the PC plate 115 as shown in FIG. 3, as the third step of this method, L
A pair of character-shaped assembled open channel blocks are arranged. FIG. 4 shows the L-shaped assembly open channel blocks 21 and 23 with crushed stones 113 and P.
An end view showing the arrangement on the upper surface of the C plate 115 (see FIG. 3).
The same end face is shown. 5 is similar to FIG. 4, and the L-shaped assembly open channel blocks 21 and 23 are crushed by a crushed stone 113.
And a plan view showing the arrangement on the upper surface of the PC plate 115 (in FIG. 4, it is seen from the direction of arrow G).
Is. The third step of this method will be described with reference to FIGS. 4 and 5. In the second step, a predetermined position of the internal space 13 of the open shield machine 11 (as will be described later, the open channel formed by the L-shaped assembly open channel blocks 21 and 23 is in the front-back direction (in FIG. 5, the front direction is arrow F). Direction and the rearward direction are arranged along the arrow B).) The L-shaped assembly open water channel blocks 21 and 23 are placed on the left and right (open shield machine 1).
1 refers to the left and right when facing the rear, specifically, Fig. 4
Further, in FIG. 5, the left direction is the arrow J2 direction, and the right direction is the arrow J1 direction. ) Place a pair on both sides. Further, in FIG. 5, a closing plate 71 made of a concrete plate is attached over the entire rear end surfaces of the L-shaped assembled open water channel blocks 21, 23. The purpose is to prevent the entry of earth and sand from the rear end side of the L-shaped assembled open water channel blocks 21, 23 into the space between them. Although not shown here, one of the closing plate 71 and the rear end faces of the L-shaped assembled open water channel blocks 21 and 23 is provided with a fitting protrusion formed to project toward the other. With
On the other side, a fitting recess is formed so that the fitting projection is just fitted, and in the state where the fitting projection is fitted into the fitting recess, the closing plate 71 has the L-shaped assembly open water channel blocks 21, 2.
3 is attached to the rear end surface (the closing plate 71 and the L-shaped assembly open channel blocks 21 and 23 are connected by bolts and nuts not shown). By fitting the fitting projections and the fitting recesses into each other, the L-shaped assembled open water channel block does not need to be provided with rearward replacement beams 41a and 41b at the rear ends of the L-shaped assembled open water channel blocks 21 and 23. It is possible to restrict the rear end portions of 21, 23 from moving inward.

Next, as shown in FIG. 6, as a fourth step of the present construction method, a supporting steel block is provided so as to straddle between the side walls of the L-shaped assembly open channel blocks 21 and 23 arranged in a pair in the third step. 31 is arranged. 7 is a sectional view taken along line KK in FIG. 6, and FIG. 8 is a sectional view taken along line LL in FIG. 6 to 8
As shown in FIG. 3, the supporting steel block 31 is arranged such that the longitudinal direction thereof is in the left-right direction (the arrow J2 direction in the left direction and the arrow J1 direction in the right direction). And a pair of middle portions that are directly above the lower lateral members 33a and 33b (meaning that the axes belong to the vertical plane to which the axes of the lower lateral members 33a and 33b belong) and that have their longitudinal directions oriented in the left-right direction. Lateral members 35a, 35b,
A pair of upper lateral members 37a, 3a arranged directly above the middle lateral members 35a, 35b and having a longitudinal direction oriented in the left-right direction.
7b, lower lateral members 33a, 33b, and middle lateral member 35.
Lower support columns 32a, 3 provided in the left-right direction and in the front-back direction in a pair (six in total) for connecting the a and 35b in the up-down direction.
2b, 32c, 32d (six in total, of which only four are shown), and the middle lateral member 35a,
35b and the upper lateral members 37a, 37b are connected in the up-down direction, and three upper and lower supporting columns 34a, 34b, 34c, 34d are arranged in the left-right direction and in the front-rear direction (6 in total). Only four are shown.)
And three upper and rear connecting members 36a arranged in the left-right direction for connecting the upper lateral members 37a, 37b to each other in the front-rear direction.
36b, 36c, three middle-side front-rear connecting members (not shown) arranged in the left-right direction that connect the middle-side horizontal members 35a, 35b to each other in the front-rear direction, and lower horizontal members 33a, 3
A lower front-rear connecting member (not shown) arranged in the left-right direction for connecting the 3 b's in the front-rear direction and a pair of left-right mounting on the lower surfaces of the lower horizontal members 33 a, 33 b so that the longitudinal direction thereof is oriented in the front-rear direction. Leg portions 38a, 38b and lower lateral members 33a, 33 so that the longitudinal direction thereof is oriented in the front-back direction.
The lower left contact member 39a connecting the left end portions of b to each other, and the lower lateral members 33a, 33 so that the longitudinal direction is oriented in the front-rear direction.
The lower right contact member 39b that connects the right end portions of b to each other, and the middle lateral members 35a, 35 so that the longitudinal direction is oriented in the front-rear direction.
The left middle contact member 39c that connects the left end portions of b to each other, and the middle lateral members 35a, 35 so that the longitudinal direction is oriented in the front-rear direction.
Right middle contact member 39d connecting the right end portions of b and upper lateral members 37a, 37 so that the longitudinal direction is oriented in the front-rear direction.
An upper left contact member 39e that connects the left end portions of b to each other, and upper lateral members 37a, 37 so that their longitudinal directions are oriented in the front-rear direction.
An upper right contact member 39f connecting the right end portions of b, brace members 40a, 40b connecting the upper lateral member 37a and the middle lateral member 35a, a middle lateral member 35a and a lower lateral member 3
Breath members 40c and 40d that connect 3a, a breath member (not shown) that connects the upper lateral member 37b and the middle lateral member 35b, a middle lateral member 35b and a lower lateral member 33.
and a brace material (not shown) connecting b. For ease of illustration and understanding, FIG. 8 shows breath members 40a, 40c, upper front and rear connecting members 36a, 36b, middle front and rear connecting members (not shown), and lower front and rear connecting members (not shown). Not shown) and are not shown.

The supporting steel block 31 as described above is specifically constructed by combining H-shaped steels, and as a whole shape, the left end of the lower left contact member 39a is provided on one of a pair of parallel planes. And the left end of the left middle contact member 39c and the left end of the upper left contact member 39e are substantially in contact with each other in the front-rear direction, and the other end of the pair of parallel planes includes the right end of the lower right contact member 39b and the right middle contact member 39d. The right end and the right end of the upper right contact member 39f are substantially in contact with each other in the front-rear direction, and the legs 38a, 38b are substantially in contact with the plane perpendicular to both the one and the other in the front-rear direction (that is, a rectangular parallelepiped shape). Three surfaces, one surface and two parallel surfaces perpendicular to the one surface, are substantially in contact with each other in the front-rear direction.). The supporting steel material block 31 as described above is provided with leg portions 38 on the upper surfaces of the bottom portions 21a and 23a of the L-shaped assembly open channel blocks 21 and 23.
When the a and 38b are placed so as to be substantially in contact with each other in the front-rear direction, the left end of the lower left contact member 39a and the left middle contact member 39 are attached to (the inner surface of) the side wall 21b of the L-shaped assembly open channel block 21.
The left end of c and the left end of the upper left contact member 39e are substantially in contact with each other in the front-rear direction, and the L-shaped assembly open water channel block 23 is provided.
The right end of the lower right contact member 39b, the right end of the right middle contact member 39d, and the right end of the upper right contact member 39f are substantially in contact with (the inner surface of) the side wall 23b of the right end in the front-rear direction. In this manner, the left end of the lower left contact member 39a, the left end of the left middle contact member 39c, and the left end of the upper left contact member 39e substantially contact the side wall 21b (inner surface thereof) of the L-shaped assembled open water channel block 21 in the front-rear direction. ,
Moreover, the right end of the lower right contact member 39b and the right middle contact member 39d are provided on (the inner surface of) the side wall 23b of the L-shaped assembled open channel block 23.
When the right end of the L-shaped assembled open water channel block 21 is substantially in contact with the right end of the upper right contact member 39f in the front-rear direction.
Side wall 21b and side wall 2 of L-shaped assembly open channel block 23
Both 3b and 3b are restricted from moving inward.

Then, as shown in FIG. 9, as a fifth step of the present construction method, after excavating the earth and sand in front of the open shield machine 11 with a backhoe (excavation of earth and sand is not shown), the propulsion jack of the open shield machine 11 is carried out. Extend 3. The extension of the propulsion jack 3 extends the space between the front frame 1 and the tail frame 2 to press the front end of the earth and sand 131 behind the open shield machine 11 toward the rear, and the forward reaction force generated by the pressing. As a result, the front frame 1 advances (state of FIG. 9). After that, the propulsion jack 3 is contracted, and the tail frame 2 is moved forward (the front frame 1 does not move). Due to the extension and contraction of the propulsion jack 3 described above, the open shield machine 11 advances.

Further, as shown in FIG.
As a process, the L-shaped assembly open channel blocks 21 and 23 located behind the open shield machine 11 advanced in the fifth process are backfilled with the backfilling sand 141. At this time, as described in the embodiment of 1993 Utility Model Application Publication No. 21538, the flexible plate 4 includes the tail frame 2 and the L-shaped assembly open water channel blocks 21, 23. Since the clearance generated therebetween is closed, the backfill earth 141 does not collapse into the tail frame 2. And here, the L-shaped assembly open channel block 2
In parallel with the backfilling with the backfilling sand 141 of Nos. 1 and 23, the open shield machine 1 as the second step already described.
Performing soil floor leveling (floor leveling) and foundation part formation (crushed stone 113 and PC board 115) located in the inner space 13 of 1,
Further, similarly to the above-mentioned third step, a pair of L-shaped assembly open water channel blocks 21, 23 (of course, L used in the third step)
The same as the character-shaped assembly open channel blocks 21 and 23 are used. ) Is arranged. At this time, when arranging the pair of L-shaped assembled open water channel blocks 21 and 23, the L-shaped assembled open water channel blocks 21 and 23 already arranged in the internal space 13 of the open shield machine 11 and the current distribution are arranged. L to set
The character-shaped assembly open channel blocks 21 and 23 are connected (connection step).

After that, as shown in FIG.
As a step, the supporting steel block 31 is arranged so as to straddle between the side walls of the L-shaped assembled open water channel blocks 21, 23 arranged in the sixth step (similar to the above-mentioned fourth step). The supporting steel block 31 used here is the same as the supporting steel block 31 used in the fourth step already described. In this way, the supporting steel material block 3 is provided so as to straddle between the side walls of the L-shaped assembly open channel blocks 21 and 23.
By arranging 1, the side wall 21b of the L-shaped assembled open channel block 21 and the side wall 23b of the L-shaped assembled open channel block 23 are both restricted from moving inward, as in the fourth step described above. To be done.

Then, as shown in FIG.
As a process, after excavating the earth and sand in front of the open shield machine 11 with a backhoe (excavation of earth and sand is not shown), the propulsion jack 3 of the open shield machine 11 is extended. By the extension of the propulsion jack 3, a space between the front frame 1 and the tail frame 2 extends, and the front end of the backfill earth 141 existing behind the open shield machine 11 is moved backward (see FIG. 12).
The front frame 1 is moved forward by the forward reaction force generated by the pressing and compaction in the direction of the arrow B) (the state of FIG. 12). After that, the propulsion jack 3 is contracted, and the tail frame 2 is moved forward (the front frame 1 does not move). Due to the extension and contraction of the propulsion jack 3 described above, the open shield machine 11 advances. That is, this open shield machine 1
By excavating the soil in front of 1 with a backhoe and extending and contracting the propulsion jack 3, the open shield machine 11 is opened according to the lengths of the L-shaped assembly open channel blocks 21 and 23 connected in the connecting step. A forward step of advancing is achieved.

Further, as shown in FIG. 13, the ninth method of this method is used.
As a step, the L-shaped assembly open channel blocks 21 and 23 located behind the open shield machine 11 advanced in the above-described eighth step are backfilled with backfilling sand 141. This backfilling constitutes a backfilling step of backfilling the L-shaped assembly open channel blocks 21 and 23, which are the open conduit members located behind the open shield machine 11 advanced in the forward step. At this time, the sidewalls 21b and 23b of the L-shaped assembled open channel blocks 21 and 23, which are both open channel members, of the L-shaped assembled open channel blocks 21 and 23 that are backfilled in the backfill step.
Further, a supporting steel block 31 serving as a displacement restricting means for restricting displacement of the side walls 21b and 23b inwardly of the L-shaped assembled open water channel blocks 21 and 23, which are open conduit members, is attached. Of course at this time, as described above, the flexible plate 4 and the tail frame 2 and L
Since the clearance generated between the character-shaped assembled open channel blocks 21 and 23 is closed, the backfill earth 141 does not collapse into the tail frame 2. Then, the earth and sand 141 for backfilling the above-mentioned L-shaped assembly open channel blocks 21, 23.
In parallel with the backfilling by, the soil floor leveling (floor leveling) and foundation part formation (crushed stone 113 and PC board 115) located in the internal space 13 of the open shield machine 11 are performed, and a pair of L-shaped The assembly open channel blocks 21 and 23 are arranged. At this time, when arranging the pair of L-shaped assembled open water channel blocks 21 and 23, the open shield machine 1
The L-shaped assembled open water channel blocks 21, 23 already arranged in the internal space 13 of 1 are connected to the L-shaped assembled open water channel blocks 21, 23 arranged this time (coupling step).

After that, as shown in FIG.
As the 0th step, the support steel block 31f located on the rearmost side (close to the arrow B direction in FIG. 14) of the support steel blocks 31 arranged in the L-shaped assembly open channel blocks 21 and 23 is provided. Front joints of the L-shaped assembled open water channel blocks 21f and 23f (joint portions of the L-shaped assembled open water channel blocks 21f and 23f and the L-shaped assembled open water channel blocks 21h and 23h that are one front side from them). ), And the reshuffling beams 41a and 41b are attached to the upper and lower two stages. FIG. 15 is a sectional view taken along line MM of FIG. The refill beams 41a and 41b will be described with reference to FIG. 15 (note that the MM section has an L-shaped assembled open channel block 21).
f, 23f and L-shaped assembly open channel block 21h, 23h
The L-shaped assembled open channel blocks 21f and 23f do not have a cross-section because they coincide with the joint surface with. ). Each of the refill beams 41a and 41b is a bar-shaped member using H-shaped steel as a whole, and the refill beam 41a is installed near the upper end and the refill beam 41b is installed near the bottom face. .

The refill beam 41a includes a rod-shaped main body 41aa.
And an engaging support portion 41ab that is formed at both ends of the rod-shaped main body portion 41aa and engages with the upper surfaces of the side walls 21b and 23b of the L-shaped assembly open water channel blocks 21 and 23 (the engaging support portion 41ab has upper surfaces of the side walls 21b and 23b. The refill beam 41a is supported by engaging with the.), And one end side thereof extends over the L-shaped assembly open water channel block 21f and the L-shaped assembly water channel block 21h. While engaging, the other end is engaged so as to straddle the L-shaped assembled open water channel block 23f and the L-shaped assembled open water channel block 23h. In this way, the refill beam 41a is L-shaped like the supporting steel block 31.
Side walls 21b of the L-shaped assembly open channel blocks 21f and 21h and side walls 23b of the L-shaped assembly open channel blocks 23f and 23h.
Both restrict movement inward.

The refill beam 41b is a rod-shaped main body 41ba.
And bottoms 21a, 2 of the L-shaped assembly open water channel blocks 21, 23 attached to the left and right sides of the bottom surface of the rod-shaped body 41ba.
The engaging leg 41bb (engaging leg 4
The refill beam 41b is supported by placing 1bb on the upper surfaces of the bottom portions 21a and 23a. ), And. Then, one end side of the rod-shaped main body portion 41ba engages so as to straddle the L-shaped assembled open water channel block 21f and the L-shaped assembled open water channel block 21h, and the rod-shaped main body portion 41ba.
The other end of ba is engaged so as to straddle the L-shaped assembled open water channel block 23f and the L-shaped assembled open water channel block 23h.
In this way, the refill beam 41b is similar to the supporting steel block 31 in that the L-shaped assembly open channel blocks 21f and 21h are formed.
Side wall 21b and L-shaped assembly open channel block 23f, 23
Both of the side walls 23b of h are restricted from moving inward.

Further, as shown in FIG. 16, the first method
As one step, the support located at the rearmost side (the one having the refill beams 41a and 41b attached to the front joint part) of the support steel blocks 31 arranged in the L-shaped assembly open channel blocks 21 and 23. Steel block 31f
Is removed from the L-shaped assembled open water channel blocks 21f and 23f, and the removed supporting steel block 31 is attached to the most front end (direction of arrow F in FIG. 16). At this time, the supporting steel block 31f is replaced with the L-shaped assembly open channel block 21.
Even if it is removed from f and 23f, both the side wall 21b of the L-shaped assembly open water channel block 21 and the side wall 23b of the L-shaped assembly water channel block 23 are removed by the reshuffling beams 41a and 41b attached in the tenth step. It is restricted to move inward. Further, here, the side wall 21b of the L-shaped assembled open water channel block 21 and the L-shaped assembled open water channel block 23 are provided.
The force to move the side wall 23b of the back wall 23b inward is to expand the above-mentioned propulsion jack 3 and to press the front end of the backfilling earth / sand 141 existing behind the open shield machine 11 toward the rear and to move forward. L-shaped assembled open water channel block 21, with which the front end of the backfill earth and sand 141 (that is, the portion facing the flexible plate 4 here) comes into contact when the front frame 1 is advanced by a reaction force to the front frame 1.
23 is the maximum, so the front end touches L
A high-rigidity supporting steel block 31 is arranged in the character-shaped assembly open channel blocks 21 and 23. On the other hand, this propulsion jack 3
Is not applied so much except when the front frame 1 is moved forward by compressing the backfilling soil 141 and advancing the front frame 1. Therefore, the side walls 21b of the L-shaped assembled open channel block 21 and the L-shaped assembly open channel block 21 are formed by the refill beams 41a and 41b. It is possible to restrict the inward movement of the side wall 23b of the mold assembly open water channel block 23 (there is no need to prepare many supporting steel block 31 having a complicated structure and expensive).

Similarly, (1) Excavating the earth and sand in front of the open shield machine 11 with the backhoe and extending the propulsion jack 3 of the open shield machine 11 (the backfill earth and sand 141 existing behind the open shield machine 11 is removed). Compacting (compacting step of compacting the backfilling material 141, which is the backfilling material backfilled in the backfilling step), and moving the front frame 1 forward), (2)
The propulsion jack 3 is contracted (the tail frame 2 is moved forward), and (3) L-shaped assembly open channel blocks 21, 23.
Is backfilled with earth and sand 141 for backfilling, and soil floor leveling (floor leveling) and foundation part formation (crushed stone 113 and PC board 1) located in the internal space 13 of the open shield machine 11 are performed.
15) is performed, and (4) a pair of L-shaped assembly open channel blocks 21 and 23 are disposed, and (5) the supporting steel block 31f located on the rearmost side is disposed L
Remounting beams 41a and 41b are attached to the front joint portions of the character-shaped assembled open water channel blocks 21f and 23f in upper and lower two stages, and (6) the supporting steel material block 31 located at the rearmost side.
By removing steps f from the L-shaped assembled open water channel blocks 21f and 23f and attaching the removed supporting steel material block 31 to the most front end, the steps (1) to (6) are repeated to obtain the L as shown in FIG. The character-shaped assembled open channel blocks 21 and 23 can be embedded side by side in the front-rear direction.

As shown in FIG. 17, after a predetermined number of L-shaped assembled open channel blocks 21 and 23 are arranged side by side in the front-rear direction, it is a section where refill beams 41a and 41b are installed and is L-shaped. 51 between the assembly open channel blocks 21 and 23
Reinforcing bars (not shown) are arranged in a section in which concrete is to be placed among the sections (between the bottom section 21a and the bottom section 23a. See FIGS. 17 and 15), and then in the section. Concrete is poured and cured (Fig. 18
An example of the cast concrete 61 is shown with diagonal lines. ). After the concrete curing is completed (after the concrete is solidified), the refill beams 41a and 41b in the section where the concrete is placed are removed. Reinforcing bar arrangement between the L-shaped assembled open channel blocks 21 and 23, concrete placement (including curing), and refill beams 41a and 41
The removal of b can be carried out in parallel with the steps (1) to (6) described above, and the L bar can be removed by arranging the reinforcing bars, placing concrete (including curing) and removing the refill beam.
An open channel using the character-shaped assembled open channel blocks 21 and 23 is formed.

As described above, according to this method, in the internal space 13 of the open shield machine 11, the connecting step of connecting the L-shaped assembled open water channel blocks 21 and 23, which is one unit of the open drain member, and the connecting step. 1 connected
An L-shaped assembly open channel block 21, which is the open channel member of the unit,
Located behind the open shield machine 11 advanced in the forward step after completion of one or more of the cycles, the cycle comprising an advance step of advancing the open shield machine depending on the length of 23. By repeating the backfilling step of backfilling the L-shaped assembled open channel blocks 21 and 23 that are open channel members, a plurality of units of L-shaped assembled open channel blocks 21 and 23 that are open channel members.
It is an open shield construction method that is embedded while connecting the two. Then, on the side walls 21b, 23b of the L-shaped assembled open channel blocks 21, 23 which are at least one of the L-shaped assembled open channel blocks 21, 23 which are the open channel members that are backfilled in the backfill step. The side walls 21b, 2
3b is an L-shaped assembly open channel block 21, 2 which is an open channel member
A supporting steel block 31 is attached as a displacement limiting means for limiting the displacement inward of 3 at least by a predetermined amount or more.

An L-shaped assembly opening as an open channel member is further provided, which further comprises a compaction step of compacting the soil 141 for backfill which is the backfill material backfilled by the backfill step. At least a supporting steel block 31 serving as a displacement limiting means is attached to the water channel blocks 21 and 23. Then, here, the open shield machine 11 directs the front end (here, the part of the backfill earth 141 facing the flexible plate 4) of the backfill earth 141 which is the backfill material back. The pressing step is performed so as to be pressed, and the forward step generated by the forward reaction force generated by the pressing step is achieved, and the front end (here, the portion of the backfill earth 141 facing the flexible plate 4). )
At least a supporting steel block 31 serving as a displacement limiting means is attached to the L-shaped assembly open channel blocks 21 and 23 which are one unit of the open channel members which are in contact with each other.

Further, in this method, the L-shaped assembled open channel block 2 which is one unit of the open channel member with which the front end (here, the portion of the backfill earth 141 facing the flexible plate 4) is in contact.
1, L-shaped assembled open water channel blocks 21 and 23, which are open conduit members, are arranged in front of 1, 23 (here, the L-shaped assembled open water channel blocks 21 and 23 are arranged in the internal space 13 of the open shield machine 11). In addition, the supporting steel block 31 serving as the displacement limiting means is attachable / detachable to / from the L-shaped assembled open channel blocks 21 and 23 serving as the open drain member, and one cycle (here, one connecting step and one The above-mentioned backfilling step and the above-mentioned compaction step are carried out for each of the (advancing step). Then, when the cycle and the backfill step are completed, the front end (here, the backfill earth 141 facing the flexible plate 4).
Of the L-shaped assembly open channel blocks 21 and 23, which are 1 unit of open channel members, and the front end (the portion of the backfill earth 141 facing the flexible plate 4) of 1 unit. L-shaped assembly open channel blocks 21 and 23 that are open channel members
L-shaped assembly open channel block 2 which is an open conduit member in front of
1, 23, and the supporting steel block 31 serving as the displacement limiting means are attached, and thereafter, the cycle or one or more subsequent cycles is completed, and before the next compaction step is performed. , L-shaped assembly open channel blocks 21 and 23, which are one unit of open channel members with which the front end (here, the portion of the backfill earth and sand 141 facing the flexible plate 4) is in contact, or an open channel located behind it Material L
The supporting steel block 31 serving as the displacement limiting means is removed from the character-shaped assembly open channel blocks 21 and 23, and the removed supporting steel block 31 serving as the displacement limiting means is backfilled to the front end (here, the flexible plate 4 is faced). It is attached to the L-shaped assembled open channel blocks 21 and 23 that are the open channel members in front of the L-shaped assembled open channel blocks 21 and 23 that are the open channel members that are in contact with the earth and sand 141).

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first step of this method.

FIG. 2 is a plan view showing a first step of this construction method.

3 is a C-C end view of FIG. 2. FIG.

FIG. 4 is an end view showing an L-shaped assembled open water channel block arranged on the upper surface of a crushed stone and a PC plate.

FIG. 5 is a plan view showing the L-shaped assembled open water channel block arranged on the upper surfaces of the crushed stone and the PC plate.

FIG. 6 is a plan view showing a case where support steel blocks are arranged so as to straddle between the side walls of a pair of L-shaped assembled open water channel blocks.

FIG. 7 is a sectional view taken along line KK of FIG.

8 is a sectional view taken along line LL in FIG.

FIG. 9 is a plan view showing a state where the propulsion jack of the open shield machine is extended after excavating the earth and sand in front of the open shield machine with the backhoe.

FIG. 10 is a plan view showing the L-shaped assembled open channel block located at the rear of the advanced open shield machine, backfilled with backfilling earth and sand.

FIG. 11 is a plan view showing a case where a supporting steel block is arranged so as to straddle between the side walls of a pair of L-shaped assembled open water channel blocks.

FIG. 12 is a plan view showing a state where a propulsion jack of the open shield machine is extended after excavating earth and sand in front of the open shield machine with a backhoe.

FIG. 13 is a plan view showing the L-shaped assembly open channel block located at the rear of the further advanced open shield machine, backfilled with backfilling earth and sand.

FIG. 14 is a front support joint portion of an L-shaped assembly open water channel block in which a rearmost supporting steel material block among the supporting steel material blocks arranged in the L-shaped assembly open water channel block is provided. It is a top view which shows the place where the replacement beam was attached to upper and lower two steps.

15 is a sectional view taken along line MM in FIG.

[Fig. 16] A supporting steel block located at the rearmost side of the supporting steel blocks arranged in the L-shaped assembled open channel block is removed from the L-shaped assembled open channel block, and the removed supporting steel block is most It is a top view showing a place attached to the front end.

FIG. 17 is a plan view showing a state where the L-shaped assembled open channel blocks are arranged and embedded in the front-rear direction.

FIG. 18 is a plan view showing concrete cast between L-shaped assembly open channel blocks.

[Explanation of symbols]

1 front frame 2 tail frame 3 propulsion jack 4 Flexible plate 11 open shield machine 13 Internal space 21, 23 L-shaped assembly open channel block 21a, 23a bottom 21b, 23b Side wall 31 Support steel block 32a, 32b, 32c, 32d Lower support pillar 33a, 33b Lower lateral member 34a, 34b, 34c, 34d Upper support pillar 35a, 35b middle lateral member 36a, 36b, 36c Upper and lower connecting members 37a, 37b Upper lateral member 38a, 38b legs 39a Lower left contact member 39b Lower right contact member 39c Left middle contact member 39d Right center contact member 39e Upper left contact member 39f upper right contact member 40a, 40b, 40c, 40d Breath material 41a, 41b Refill beam 41aa Rod-shaped main body 41ab engaging support 41ba Bar-shaped body 41bb engagement leg Between 51 61 concrete 71 Block 101 backhoe 111 soil floor 113 Crushed stone 115 PC board 131 earth and sand 141 Sediment for backfilling

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigeru Hirota             Aisa, 1-5-1, Omotemachi, Okayama City, Okayama Prefecture             Wa Industrial Co., Ltd. F-term (reference) 2D044 AA23 AA27 AA32                 2D054 AB05 AC16 AD02 BA17

Claims (4)

[Claims] 1. In an internal space of an open shield machine, 1
A cycle comprising a connecting step for connecting the unit open-close members, and an advancing step for moving the open shield machine forward according to the length of the unit open-open member connected in the connecting step; Alternatively, a plurality of units of open channel members are connected by repeating a backfill step of backfilling the open channel member located behind the open shield machine advanced in the forward step after completion of two or more of the cycles. In the open shield construction method, the side wall of at least one of the open channel members to be backfilled in the backfill step is provided with at least a predetermined amount of the side wall in the inner direction of the open channel member. An open shield construction method, characterized in that displacement limiting means for limiting the above displacement is attached. 2. A compacting step for compacting the backfill material backfilled by the backfilling step, wherein at least the displacement limiting means is attached to an open channel member that receives a pressure generated by the compacting step. The open shield construction method according to claim 1, wherein 3. The open shield machine performs the compaction step so as to compact the front end of the backfilled material that has been backfilled toward the rear, and the forward reaction force generated by the compaction step causes the forward shield to perform the compaction step. The open shield construction method according to claim 2, wherein a forward step is achieved, and at least the displacement limiting means is attached to one unit of the open-drain member in contact with the front end. 4. The open-drain member is arranged in front of one unit of the open-drain member in contact with the front end, and the displacement limiting means is detachable from the open-drain member. On the other hand, the backfilling step and the compaction step are respectively performed, and when the cycle and the backfilling step are completed, one unit of open channel member with which the front end contacts and one unit of open channel with which the front end contacts The displacement limiting means is attached to the open-ditch member in front of the member, and then the cycle or one or more subsequent cycles is completed,
Before the next compaction step is performed, the displacement limiting means is detached from one unit of the open drain member which is in contact with the front end or the open drain member which is behind the open drain member, and the removed displacement limiting means is attached to the open drain member. The open shield construction method according to claim 3, wherein the open shield member is attached to the open conduit member in front of one unit of the open conduit member with which the front end is in contact.