JPH09144472A - Hollow segment and connecting method of hollow segment thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct the wall body of a firm subsurface structure having excellent handling properties and workability. SOLUTION: In hollow segments 1 made of steel, projecting sections 2 and recessed groove sections 3 are formed on both side faces respectively while upper and lower brackets 5, 6 are fixed to one side section on the insides, and joint members 4 are stored in the other side sections. Through-holes, to and from which an operator goes in and out, and bolt inserting holes are formed on front-rear wall surfaces. When a plurality of the hollow segments 1 are buried into the ground under the state, in which the segments 1 are arranged in parallel before and behind and light and left, and a wall body is built, the front-rear hollow segments are mutually connected integrally by fitting bolts into the bolt inserting holes, and wall surfaces in the mutually joined projecting sections 2 and recessed groove sections 3 are cut off and opening sections are formed in the mutual right-left hollow segments 1. The joint member 4 is fixed between the upper and lower brackets 5, 6 of the other hollow segment 1 from one hollow segment 1 side through the opening section, and concrete is placed into the hollow segments 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow segment for forming a wall such as an outer shell of an underground structure in the ground and a method for connecting the hollow segments to each other.

[0002]

2. Description of the Related Art Conventionally, in order to build an underground space such as a tunnel in the ground, a so-called excavation is performed by excavating the ground from the ground surface to a desired depth with the length and width of the planned underground space and then constructing a wall body. The method of construction and the method of sequentially assembling the segments at the tail of the excavator while excavating the ground with a shield excavator are generally known. Not only may there be cases in which construction cannot be performed due to the existence, but there is also the possibility that the facility functions on the ground may be impeded for a long period of time during construction, and there is also the problem that efficient construction is difficult. .

On the other hand, according to the shield construction method, as the diameter of the cutter plate for excavating the ground becomes larger, the maximum excavation diameter is about 16 m because the excavation cannot be done unless the rotational speed of the cutter plate is lowered due to the friction with the ground. It is difficult to build an underground space with a large cross section of 20 m or more, and the larger the excavation diameter, the more complicated the rotary drive mechanism and other structures become, and the strength and accuracy are increased. There is a problem that the production cost is high because of the demand. Also, even if it is suitable for excavation in the deep underground part, when excavating in the relatively shallow ground, the ground will collapse, so it is not suitable as a construction method for constructing a large space in the shallow underground part. It is impossible to excavate a space with a rectangular cross section, such as an underground mall.

Therefore, the applicants of the present application filed Japanese Patent Application Laid-Open No. 4-155.
A method for constructing an underground space as described in Japanese Patent No. 094 was developed. This method consists of two pilot pipes along the outer circumference of the planned underground space between vertical shafts excavated at predetermined intervals.
After embedding a plurality of sets in parallel at regular intervals as one set, the ground between the pilot pipes with the front end both sides of the flat plate-shaped segment in contact with the rear end faces of the adjacent pilot pipes of the adjacent set. A method of constructing an outer shell of an underground space consisting of a segment row by pushing the pilot pipe to the other vertical shaft side while digging Therefore, according to this method, it is possible to efficiently construct a large underground space having a rectangular cross section even in the ground shallow from the ground surface.

[0005]

However, since the segment forming the wall of such an underground structure is made of concrete, it is heavy and difficult to handle such as transportation, and the segments are adjacent to each other after being buried. There were problems such as insufficient rigidity and watertightness of joints between segments, weak joint strength, and intrusion of groundwater. Further, when the wall body is formed, even if the concave and convex strips slidably engaged with each other are provided on the opposite side surfaces of the segment, the segment is formed by pushing out the pilot pipe at the front end face of the side portion thereof. Since the pilot pipes are used as guides for propelling, if each set of pilot pipes is buried vertically and horizontally, the opposite side faces of the segment to be embedded next in the recessed strip of the segment embedded first It becomes impossible to propel the protruding strip protruding from the above while engaging it at a correct position. In particular, the longer the construction is, the more the accuracy of burying the pilot pipe becomes different, which makes it difficult to construct a long underground structure.

Further, the strip provided on the side surface of the already buried segment is embedded in the ground in an exposed state, and the strip of the next segment is propelled while engaging the strip of the next segment with this strip. Not only does the sand and sand get into the engaging part of the uneven strips that hinders smooth propulsion, but it is also difficult to integrate the opposing side faces of the segment, which weakens the wall of an underground structure that consists of segment rows. There was a problem that parts were created. It is an object of the present invention to provide a hollow segment for forming an underground wall and a method of connecting the hollow segment, which can solve the above problems.

[0007]

In order to achieve the above object, the hollow segment of the present invention has a ridge on one side of the hollow segment made of a flat steel rectangular hollow box and a protrusion on the other side. Recessed grooves having a shape capable of engaging with the ridges are formed over the entire length, respectively, and a joint member formed by projecting a plurality of sea connectors on one side of the hollow inside of the hollow segment is housed. It has a structure in which a bracket for connecting the ends of joint members of adjacent hollow segments is fixed to the other side of the inside of the hollow.

According to a second aspect of the present invention, in the hollow segment having the above structure, the bracket is fixed to the facing surfaces of the upper and lower wall surfaces of the hollow segment, and the facing surfaces of the upper and lower brackets are adjacent to the hollow segment. It is configured such that the end of the joint member where the shear connector of the joint member does not project is intervened from the hollow segment side and the end of the joint member is integrally fixed to the upper and lower brackets by welding or bolts. The invention according to item 3 is characterized in that the front and rear wall surfaces of the hollow segment are provided with a connecting bolt insertion hole and a through hole through which a worker can go in and out.

As a method of connecting the hollow segments, as described in claim 4, the hollow segments are successively connected in series in the ground with a temporary pipe fitted in the concave groove of the hollow segment. When burying the next hollow segment row adjacent to the side of this hollow segment row and burying it in the hollow segment row, the ridge of this hollow segment to be embedded fits into the groove of the previously buried hollow segment. The temporary pipe being pushed out and removed, and the ridges thereof are embedded while being engaged with the groove portions, and then the side plate portion forming the ridge portions and the groove portions of the left and right hollow segments joined to each other is formed. To cut off the left and right hollow segments to communicate with each other, and then insert the end of the joint member housed in one hollow segment into the other hollow segment to connect the end to the other hollow segment. Seg Secured to cement the bracket, and then is characterized in that to fill the concrete inside the hollow segments.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Since the hollow segment is made of a steel hollow box, the weight is light and the handling and other handling are good. When embedding a plurality of these hollow segments in the ground to form an underground wall, first, the hollow segments are buried in the ground with a temporary pipe fitted in a groove provided on one side surface thereof. Buried sequentially in series. At this time, it is possible to reliably prevent dirt and sand from entering the concave groove portion by the temporary pipe fitted in the concave groove portion. In addition, since the connecting bolt insertion hole and the through hole through which the worker can go in and out are provided on the front and rear wall surfaces of the hollow segment, the worker can enter the hollow segment and perform the connecting work between the front and rear hollow segments. The hollow segments are accurately and integrally connected by bolting the through holes communicating with each other.

Next, the next hollow segment is buried adjacent to the side of this hollow segment row. At this time, the provisional pipe fitted in the recessed groove portion of the hollow segment previously embedded by the protrusion portion provided on the other side surface of the hollow segment is pushed out and removed, and the protrusion portion is engaged with the recessed groove portion. It is buried in the left state. Therefore, while preventing the intrusion of earth and sand into the concave groove portion and accurately joining the left and right hollow segments by fitting the protruding portion and the concave groove portion, the hollow segment row is embedded along the hollow segment row previously embedded to the side. The hollow segments can be sequentially and smoothly press-fitted and buried with high accuracy.

By embedding the hollow segment rows in parallel as described above, a wall having the thickness of the hollow segment is constructed. On the other hand, in order to integrally connect the left and right adjacent hollow segments, first, the side plate portions forming the protrusions and the groove portions of these hollow segments that are fitted to each other are cut off to remove these left and right hollow segments. Connect the inside of the segment. At this time, the upper and lower opening widths and the front and rear opening widths of the cut portion are cut off so that they are larger than the height dimension and the front and rear width between the upper and lower surfaces of the joint member housed in the hollow segment.

Next, the end portion of the joint member housed in one hollow segment is inserted into the other hollow segment, and the end portion is fixed between the upper and lower brackets fixed to the upper and lower wall surfaces of the other hollow segment. Intervene. Opposing surfaces of the upper and lower brackets are formed as flat surfaces parallel to each other, and the upper and lower surfaces of the joint member are slidably contacted with the opposing surfaces. The bracket may be provided on one of the upper and lower wall surfaces of the hollow segment.

When the joint member from one hollow segment side is inserted between the upper and lower brackets of the other hollow segment, a gap is provided between the periphery of the joint member and the peripheral edge of the opening of the cut portion, so that the left and right hollow segments are provided. Even if they are joined in a state where they are slightly offset from each other in the front-rear direction or the up-down direction, or even if they are joined to one hollow segment while the other hollow segment is slightly inclined in the up-down direction,
Such a gap or deviation can be absorbed by the gap, and the ends of the joint member can be fixed to the upper and lower brackets by welding or bolts in a state of being accurately and surely aligned.

After the above-mentioned connecting work between the hollow segments joined to the left and right is completed, when all the hollow segments are filled with concrete through the through holes provided in the hollow segments, the joint members in the hollow segments are embedded in the concrete. It is firmly integrated with concrete through the shear connectors protruding from the upper and lower surfaces thereof, and the connection with the adjacent hollow segment is strengthened through this joint member, and the pressure resistance has uniform strength as a whole. A wall body having excellent properties can be formed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the present invention will now be described with reference to the drawings. FIG. 1 shows a wall W of a ceiling wall portion of an underground structure formed by the hollow segment 1 of the present invention. Both side wall portions W ₁ and W ₁ and the bottom wall portion W ₂ on the lower surface side of both ends of the body W are used to construct an underground structure having a large cross section space formed by cast-in-place concrete.

FIG. 2 shows a hollow segment 1. The hollow segment 1 is made of a steel plate and is formed in a box shape. The width and length are obtained by dividing a wall body W to be formed into a plurality of rectangular walls. And has a thickness (height) of about 2 meters. A ridge portion 2 having a U-shaped cross section is formed at the center of one side surface, and a ridge portion 2 having a U-shaped cross section having a size that allows the ridge portion 2 to be fitted to the center portion of the other side surface parallel to the one side surface. The concave groove portions 3 are formed over the entire length. Further, inside the hollow segment 1, a joint member 4 made of an I-shaped steel having a constant length is accommodated on one side thereof, and on the other side thereof, on the opposite surfaces of the upper and lower plates 1a and 1b of the hollow segment 1. Upper and lower steel brackets 5 and 6 each having a T-shaped cross section fixed to each other by welding or the like are provided.

As shown in FIGS. 7 and 9, a plurality of shear connectors 7 made of bolt-shaped projecting members are integrally formed on the upper and lower surfaces of the joint member 4 which are parallel to each other, except for the other side end portions 4a. Is protruding. The length of the joint member 4 may be such that the left and right halves of the joint member 4 are respectively disposed in the opposite end portions when the hollow segments 1 and 1 are joined together. , Upper and lower sheer connectors 7, 7
The height between the protruding end faces of is the upper and lower plates 1 of the hollow segment 1.
It is formed smaller than the dimension between the facing surfaces of a and 1b.
Further, the other end 4a of the joint member 4 on which the shear connector 7 does not project is formed such that the dimension between the upper and lower surfaces thereof is smaller than the distance between the upper and lower opposing inner surfaces of the projecting ridge portion 2. A plurality of bolt mounting holes 8 are formed in the upper and lower edges of the end portion 4a at regular intervals in the length direction. Several joint members 4 configured in this way are provided in the hollow segment 1 (3 in the figure).
However, the number may be one.

On the other hand, the space between the parallel facing surfaces of the upper and lower brackets 5 and 6 fixed to the upper and lower plates 1a and 1b of the hollow segment 1 is formed to be approximately equal to the dimension between the upper and lower surfaces of the joint member 4. The member 4 is configured to be inserted while slidingly contacting the facing surface. The upper and lower brackets 5 and 6 are provided in pairs corresponding to the number of the joint members 4, but the upper and lower opposed surfaces of the brackets 5 and 6 are formed widely, and the end portions of several joint members 4 are formed. May be configured to be inserted in parallel. The upper and lower brackets 5 and 6 have a plurality of bolt mounting holes 9 formed at both edges thereof at the same intervals as the bolt mounting holes 8 formed in the joint member 4.

The upper and lower plates 1a, 1b of the hollow segment 1 are formed on flat surfaces without holes, while the front and rear wall surfaces 1c, 1d made of horizontally elongated rectangular steel plates are large enough for workers to enter and exit. The horizontal rectangular through holes 10 and 11 are provided, and a plurality of bolt insertion holes 12 and 13 are provided around the through holes 10 and 11.
Have been drilled respectively.

When the hollow segment 1 thus constructed is buried in the ground, it has the same length as this groove length in the concave groove portion 3 on the other side surface and has a vertical width as shown in FIG. A temporary pipe 14 made of a steel square pipe having the same thickness as the segment A is additionally provided. A guide strip 14a having a U-shaped cross section having the same shape as that of the recessed groove 3 is provided over the entire length of the central portion of one side of the temporary pipe 14, and the guide projection 14a is formed in the recessed groove. 3 is slidably fitted through a packing 15 (shown in FIG. 7). The packing 15 is fixed to the facing surface of the concave groove portion 3 over the entire length to prevent groundwater and earth and sand from entering the inside.

Next, a method of constructing a wall W of an underground structure by burying the hollow segments 1 vertically and horizontally in parallel in the ground and connecting them to each other will be described. First,
As shown in FIG. 4, after the starting shaft A and the reaching shaft B are excavated in the ground at intervals of the wall W of the underground structure, the vertical length equal to the thickness of the hollow segment 1 from the starting shaft A side. A wall body to be constructed by horizontally press-fitting a pilot pipe 16 made of a square steel pipe having a rectangular cross-section and having a width and a width (both widths have dimensions of 2 meters) toward the reaching shaft B. It is buried in a part of the cross-sectional position of W. Such an embedding method can be performed by a known excavator (not shown) followed by the pilot pipe 16 as is known.
In addition, when the length of the wall W is large, a pilot pipe of a certain length
16 may be buried while sequentially adding in series. A steel edging plate 17 is placed on the upper surface of the pilot pipe 16, and only the edging plate 17 on the frontmost pilot pipe 16 is fixed to the tip of the pilot pipe 16 by welding or the like. Then, when it reaches the reaching shaft B side, the fixed part is separated by cutting or the like, and the subsequent pilot pipe
The edge cutting plates 17 on the 16 are connected to each other by welding or the like at the time of press fitting.

When the pilot pipe 16 is embedded in the penetrating state between the compatible pits A and B, the pilot pipe 16 is formed in a part of the sectional position of the planned wall W on the side of the pilot pipe row in the same manner as above. And the pilot pipe 16 is buried in parallel at the cross-sectional position of the planned wall W as shown in FIG.

Next, the work of replacing the pilot pipe 16 with the hollow segment 1 is performed. First, a temporary pipe in the groove 3
In the starting shaft A, the front end face of the hollow segment 1 is brought into contact with the rear end faces of several pilot pipes 16 in a state in which 14 are fitted together, and the top face of the pilot pipe 16 at the forefront end on the reaching shaft B side. The tip of the edge cutting plate 17 placed on the starting pipe is cut off from the pilot pipe 16, and the edge cutting plate 17 on the pilot pipe 16 at the rearmost portion on the side of the starting shaft A is turned into a turnbuckle 18 on the wall of the starting shaft A. Etc. In this state, as shown in FIG. 4, the rod of the pressing jack 19 installed in the starting shaft A is extended and the rear end face of the hollow segment 1 is pressed to generate a reaction force on the wall surface of the starting shaft A to make it hollow. When the segment 1 is integrally propelled with the temporary pipe 14, the front end side of the pilot pipe 16 is pushed into the reaching shaft B through the hollow segment 1 and the hollow segment 1 and the temporary pipe
14 and 14 are buried in the propulsion mark of the pilot pipe 16.

At this time, since the edge cutting plate 17 arranged on the upper surface of the pilot pipe 16 is fixed, the pilot pipe 16 and the hollow segment 1 are provided on the lower surface of the edge cutting plate 17 without moving the upper ground. Also, the upper surface of the temporary pipe 14 can be smoothly propelled while being in sliding contact with it. The temporary pipe 14 may be propelled by another pressing jack, but a bolt mounting hole (not shown) is previously formed in the groove bottom wall surface of the recessed groove portion 3 of the hollow segment 1, and the bolt mounting hole Guide ridge 14
The bolt mounting holes (not shown) provided in a may be integrated by bolt connection, and the bolt may be removed after being buried. This bolt connection is a temporary pipe
It can be performed by an operator in 14 or in the hollow segment 1. The same goes for the bolt removal work.

Thus, one hollow segment with a temporary tube 1
When the hollow segment 1 is embedded, the front end face of the next hollow segment 1 with a temporary pipe is joined to the rear end face of the hollow segment 1, and bolts (not shown) are formed between the bolt insertion holes 12 and 13 of the joined front and rear wall faces 1c and 1d. No.), and then propelled and buried by the pressing jack 19 in the same manner as described above, and subsequently, the pilot pipe 16 and the hollow segment with a temporary pipe are sequentially promoted while adding and connecting the temporary segment with a temporary pipe 1. Replace 1 with. Further, after the hollow segments 1 with temporary pipes are embedded in series between the compatible shafts A and B, the hollow segments 1 with temporary pipes are embedded next to the buried hollow segment 1 with temporary pipes. Do the work.

This work is carried out by the guide projection 14 of the temporary pipe 14 fitted in the concave groove 3 of the hollow segment 1 previously buried.
The front end face of the protrusion 2 of the hollow segment 1 to be embedded next in the rear end face of a is brought into abutment with the hollow segment 1
Are brought into contact with the rear end faces of several pilot pipes 16, and then pushed forward by a pressing jack 19. At this time, if the temporary pipe 14 is connected to the concave groove portion 3 with a bolt, the bolt is removed. Then, the temporary pipe 14 previously buried is pushed forward by the front end surface of the hollow segment 1 to be buried on the side of the protrusion 2 and the next hollow is formed in the concave groove portion 3 of the buried hollow segment 1 covered by the temporary pipe 14. The ridge portion 2 of the segment 1 engages and moves forward while slidingly contacting the packing 15.

When the burying of the hollow segment 1 is completed, the hollow segment with a temporary pipe 1 is connected again by a bolt and then propelled and buried, and the temporary pipe 14 of the previously buried hollow segment 1 is reached in the reaching shaft B. The pilot pipe 16 is extruded together with the pilot pipe 16, and this operation is repeated so that the hollow segment row with the temporary pipe is adjacent to the side of the already buried hollow segment 1 and is buried in a parallel state between the compatible holes A and B. In the same manner, the next temporary tube-equipped hollow segment 1 is laterally disposed on the temporary tube-equipped hollow segment row, and the temporary tube of the hollow segment 1 is already buried.
The hollow segments 1 are vertically and horizontally arranged in parallel with each other at the burying traces of all pilot pipes 16, that is, at the cross-sectional position of the planned wall W of the underground structure by burying while pushing out 14 with the ridge 2. It is buried in the condition.

The hollow segments 1 embedded on both side ends of the planned outer wall W are hollow segments 1 on the outer end sides thereof.
Since they are not arranged in parallel, it is not necessary to provide the ridge portion 2 or the concave groove portion 3 for the joint. Further, FIG. 1 shows a structure in which the hollow segments 1 are embedded in three rows, but it is needless to say that the hollow segments 1 may be embedded by the above procedure even if there are a plurality of rows.

After the hollow segments 1 have been buried, a worker enters the hollow segments 1 and 1 adjacent to each other on the left and right, and the projecting ridge portions 2 of these hollow segments 1 and 1 are fitted to each other.
And the groove portion 3 are integrally connected by a joint member 4. In this connection work, first, the end plate 2a of the protruding portion 2 of one hollow segment 1 shown in FIG. 7 and the bottom plate 3a of the concave groove portion 3 of the other hollow segment 1 in contact with this end plate 2a are projected. A vertical width corresponding to the dimension between the upper and lower opposed inner surfaces of the strip portion 2 is entirely cut off and removed to provide an opening 20 that allows the insides of these hollow segments 1 and 1 to communicate with each other (see FIG. 8).

Next, the end 4a of the joint member 4 housed in one hollow segment 1 is inserted into the other hollow segment 1 through the opening 20 and the end is placed on the upper and lower wall surfaces of the other hollow segment 1. The upper and lower brackets 5, which are fixed to the
Intervene between 6 This operation can be carried out by bringing in a lifting device such as a jack or the like for supporting the joint member 4 into the hollow segment 1 and a pressing device, and using these devices. At this time, the peripheral surface of the other end 4a of the joint member 4 and the opening 20
Since there is a sufficient gap 21 between the joint member 4 and the vertical and horizontal movements of the joint member 4, the left and right hollow segments 1,
Even if one of the hollow segments 1 is joined in a state in which there is some deviation in the vertical direction or the front-back direction, or the other hollow segment 1 has a slight angular deviation with respect to the plane direction of one hollow segment 1. Even if they are joined together in such a state, the end portion 4a of the joint member 4 can be accurately and easily oriented in parallel with the facing surfaces of the upper and lower brackets 5 and 6 while absorbing such deviation or deviation by the gap 21. It can be inserted between the upper and lower brackets 5, 6. When a gap is formed between the upper and lower brackets 5 and 6 and the upper and lower surfaces of the end portion 4a of the joint member 4, an appropriate material may be interposed in the gap.

The end 4a of the joint member 4 is connected to the upper and lower brackets 5,
When it is inserted between 6, the shear connector 7 protruding on the foremost side in the inserting direction abuts against the vertical wall surface 2b of the base end portion of the projecting ridge portion 2 which is bent in a stepwise manner, and further insertion is prevented. At the same time, the abutment joins the end portions 4a to the opposing positions of the upper and lower brackets 5 and 6 in a predetermined position. In this state, the bolt 22 is inserted between the bolt mounting hole 8 on the end side of the joint member 4 and the mounting hole 9 on the bracket side which are matched with each other, and the nut is screwed to fix the joint member 4 to the upper and lower brackets 5, 6 is integrally connected. Note that the end portions of the joint member 4 may be integrally connected to the upper and lower brackets 5 and 6 by welding instead of the connection by the bolts. Further, the brackets 5 and 6 may be provided on either one, preferably on the lower side, without providing them on the upper and lower sides.

The hollow segments 1 and 1 thus joined to each other in the front and rear direction are sequentially connected by bolts when buried, and the hollow segments 1 and 1 joined to the left and right are fixed with the joint member 4 on the brackets 5 and 6 as described above. By doing so, the hollow walls of the underground structure are constructed by being connected. After the construction of this hollow wall body, or after connecting the left and right joined hollow segments 1 and 1 to each other, a reinforcing bar is assembled inside the hollow segment 1 as required, and before and after communicating with each other inside. Through holes 5 formed in the wall surfaces 1c and 1d,
Concrete 23 is poured through 6 and filled. By filling the concrete 23, the joint member 4 in the hollow segment 1 is embedded in the concrete 23 and is firmly integrated with the concrete through the sheer connectors 7 protruding from the upper and lower surfaces thereof, and the joint member 4 is The connection with the adjacent hollow segment 1 is strengthened through the construction, and the wall body W having uniform strength as a whole and excellent in pressure resistance is built.

Next, while excavating the coexisting wells A and B deeper and excavating the ground below the wall W by an appropriate excavating means, a support work C (shown in FIG. 1) is built, and both sides of the underground structure are built. The walls W ₁ , W ₁ and the bottom wall W ₂ are formed by cast-in-place concrete to construct an underground structure. In addition, the support work C ₁ in the center will be removed after the construction is completed.

Both side walls W ₁ , W ₁ and the bottom wall W _{2 of} the underground structure may be constructed by replacing the pilot pipe 16 with the hollow segment 1 as described above. As shown in FIG. 1, the outer shell of an object is not limited to a rectangular cross section, and an outer shell having a circular cross section can be constructed in the same manner as above.

When constructing the wall W of an underground structure, in the above embodiment, the pilot pipe is placed at the cross-section position of the wall W.
The hollow segments 1 were replaced with the hollow segments 1 after 16 side-by-side close contact with each other, but the pilot pipes 16 were separated from each other in the widthwise intervals of the temporary segments 1 with the temporary pipes. It is buried in a space between the pilot pipes 16 and 16 by excavating the earth and sand between the pilot pipes 16 and 16 with an appropriate excavator while following the excavator and propelling and burying the hollow segment 1. You may substitute.

[0037]

As described above, according to the hollow segment of the present invention, since it is formed in the shape of a hollow box made of a steel plate, the weight is reduced and the handling and other handling such as transportation and the workability are improved. The right and left adjacent segment main bodies can be accurately joined by fitting the ridges and the concave grooves provided on the opposite side faces, and in addition, the connecting bolt insertion hole and the worker can be attached to the front and rear wall surfaces of the hollow segment. Since the through-holes that can be moved in and out are provided, the hollow segments joined to the front and rear can be firmly joined together by bolts, and the joining work can be easily performed by a worker entering the hollow segments.

Further, in the method of the present invention for connecting hollow segments adjacent to each other on the left and right sides, when the hollow segment is buried in the ground, the hollow segment is buried with the temporary pipe fitted in the groove on the other side surface. Therefore, it is possible to protect the concave groove portion by the temporary pipe and to embed it while preventing the infiltration of earth and sand into the groove, and further embed the next hollow segment on the side of the embedded hollow segment. At this time, since the temporary pipe fitted in the concave groove portion of the hollow segment previously embedded in the protruding portion of the hollow segment is pushed out and removed, the protruding portion is embedded while being engaged with the concave groove portion. The hollow segment can be accurately embedded in the wall formation planned portion, and the segment can be smoothly propelled while preventing the sand and sand from entering between the ridge and the groove by the temporary pipe. .

After burying the hollow segment, the worker enters the hollow segment through the through hole provided in the hollow segment to cut off the side plate portion forming the ridge and the groove. It is possible to form an opening communicating between the insides of the left and right hollow segments, and after forming this opening, the end of the joint member housed in one hollow segment is passed through the opening to the other hollow segment. By fixing the bracket to the bracket, the joint member can be arranged between the hollow segments. At this time, since the opening can be formed to be larger than the joint member, even if the left and right hollow segments are joined in a state where they are slightly displaced from each other in the front-rear direction or the vertical direction, or one hollow segment On the other hand, even if the other hollow segment is joined in a state in which it is slightly inclined in the vertical direction, the end of the joint member can be accurately and easily added to the attachment point for the bracket and fixed by welding or bolts. it can.

Further, after the above-described connecting work of the hollow segments, concrete can be efficiently filled in all the hollow segments through the through holes provided in the hollow segments, and by filling the concrete, the joint member in the hollow segments is filled. Is firmly embedded in the concrete through the shear connectors that are embedded in the concrete and project from the upper and lower surfaces of the concrete, and the connection with the adjacent hollow segment becomes firm through this joint member, resulting in uniform overall It is possible to form a wall body having excellent strength and excellent pressure resistance.

[Brief description of the drawings]

FIG. 1 is a simplified vertical sectional front view of an outer shell of an underground structure,

FIG. 2 is a partially cutaway perspective view of a hollow steel segment,

FIG. 3 is a simplified perspective view of a hollow segment with a temporary pipe attached,

FIG. 4 is a simplified vertical sectional side view showing a state in which the pilot pipe and the hollow segment are replaced.

FIG. 5 is a simplified vertical sectional front view showing a state in which a pilot pipe is embedded,

FIG. 6 is a simplified vertical sectional front view for explaining a case of replacing with a hollow segment;

FIG. 7 is a vertical cross-sectional front view of a main part showing a state where left and right hollow segments are joined together;

FIG. 8 is a vertical cross-sectional front view showing a state in which the left and right hollow segments are connected by a joint member,

FIG. 9 is a vertical sectional side view taken along line XX.

[Explanation of symbols]

 1 Hollow segment 2 Projection part 3 Recessed groove part 4 Joint member 5, 6 Bracket 7 Shear connector 10, 11 Through hole 14 Temporary pipe 20 Opening 23 Concrete

Claims (4)

[Claims] 1. A ridge portion is formed on one side surface of a hollow segment formed of a flat rectangular steel hollow box, and a concave groove portion having a shape engageable with the ridge portion is formed on the other side surface over the entire length. Then, a joint member formed by projecting a plurality of shear connectors is housed on one side of the hollow interior of this hollow segment, and the end of the joint member of the adjacent hollow segment is placed on the other side of the hollow interior. A hollow segment characterized in that a bracket to be connected is fixed. 2. The bracket is fixed to the facing surfaces of the upper and lower wall surfaces of the hollow segment, and the shear connector of the joint member is provided on the facing surface of the upper and lower brackets from the side of the hollow segment adjacent to the hollow segment. 2. The hollow segment according to claim 1, wherein the ends of the joint members are integrally fixed to the upper and lower brackets by welding or bolts by interposing the ends which are not formed. 3. The hollow segment according to claim 1, wherein the front and rear wall surfaces of the hollow segment are provided with a connecting bolt insertion hole and a through hole through which a worker can go in and out. 4. The hollow as described above, which comprises a flat rectangular steel hollow box having a ridge portion formed on one side surface and a concave groove portion having a shape engageable with the ridge portion on the other side surface over the entire length. A method for connecting hollow segments joined to each other when burying a plurality of segments in the ground to form an underground wall body, wherein the hollow pipe is fitted with a temporary pipe in the groove portion of the hollow segment. When the segments are sequentially buried in series in the ground and the next hollow segment row is buried adjacent to the side of this hollow segment row, the hollows previously buried by the ridges of this hollow segment to be buried After pushing out the temporary pipe fitted in the groove of the segment and removing it, the protrusion is engaged with the groove and embedded, and then the protrusion and groove of the left and right hollow segments joined to each other. Side plates forming and The left and right hollow segments are made to communicate with each other by cutting off the portion, and then the end of the joint member housed in one hollow segment is inserted into the other hollow segment and the other end is inserted into the other hollow segment. A method for connecting hollow segments, which comprises fixing to a bracket of a hollow segment and then filling the inside of the hollow segment with concrete.