JP3245529B2 - Method of forming roof for building underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to press-fit and bury an underground structure at a position corresponding to the upper floor of the underground structure prior to constructing the underground structure under the railway track or under a road. The present invention relates to a method for forming a roof.

[0002]

2. Description of the Related Art Conventionally, in order to build an underground structure for forming a passage or the like in a direction intersecting the road, for example, in the ground under the road, first, as shown in FIG. After excavating the shafts B and C on both sides of the road A, a plurality of steel rectangular pipes 21 each having the strip-shaped edge plate 22 placed on the upper surface are designed underground between the shafts B and C underground. As shown in FIG. 18, a pipe roof P having a width substantially equal to the width of the upper floor portion is formed by press-fitting at least into a portion corresponding to a cross-sectional position of the upper floor portion of the structure to form a pipe roof P. With the front end face of the upper floor of the underground structure F in contact with the rear end face of P and the strip-shaped edge plate 22 fixed, the underground structure F is placed on the lower surface of the strip-shaped edge plate 22 while excavating the ground in front. The pipe row of the pipe roof P is replaced with the underground structure F by moving forward along It has been done to.

[0003]

However, since the pipe roof P is formed from the steel rectangular pipe 21, it is not only expensive than the H-section steel or the I-section steel, but also has one of the shafts B. When this rectangular pipe 21 was pressed into the ground from the side to the other shaft, earth and sand entered the pipe,
Filling increases the earth pressure resistance, making the press-in operation difficult. For this reason, it has been performed to insert a drilling tool such as a screw auger into the rectangular pipe 21 and press-fit while excavating the front ground.However, the rotation of the screw auger may cause the rectangular pipe to roll. In some cases, it cannot be press-fitted and buried at a position exactly juxtaposed to the side of the buried rectangular pipe.

[0004] As a measure against rolling of the rectangular pipe 21, it is carried out by securing locking metal fittings having an L-shaped cross section which can be engaged with each other over the entire length on both side surfaces of the rectangular pipe. There is a problem that the mounting work of the bracket is troublesome and the construction cost is higher, and furthermore, while engaging the latch of the rectangular pipe 21 to be next press-fitted into the latch of the rectangular pipe 21 buried earlier, At the time of press-fitting, there is a problem in that earth and sand penetrate between both locking metal fittings, making smooth embedding difficult and lowering work efficiency. An object of the present invention is to provide a method of forming a roof for building an underground structure capable of completely solving such a problem.

[0005]

In order to achieve the above object, a method for forming a roof for building an underground structure according to the present invention is characterized in that a horizontal flange portion is integrally provided at the upper and lower ends of a web portion as a roof forming member. An edge-shaped plate is placed on the upper surface of the upper horizontal flange portion of the roof-forming member using an E-shaped section steel, and the edge of the edge-forming plate is fixed to the edge of the roof-forming member. The underground structure is propelled and buried in the ground from the start side to the arrival side of the underground construction site in the underground structure in the penetrating state. When the roof forming member is propelled and embedded with the side end surfaces of the upper and lower horizontal flange portions facing each other being in contact with each other ,
A cross section surrounded by the upper and lower horizontal flanges and the web
This method is characterized in that the roof is formed by arranging a plurality of roof forming members in parallel by propelling and embedding while removing earth and sand in the surface rectangular portion , and repeating this operation.

Further, when propelling and embedding the roof-forming member to be buried in a state where the upper and lower horizontal flanges of the roof-forming member to be buried are in contact with the opposite side end surfaces of the upper and lower horizontal flanges of the roof-forming member to be buried next. Rectangular section surrounded by opposed upper and lower horizontal flange portions and web portion of the roof forming member
It is desirable to remove or loosen the earth and sand inside the unit while propelling and burying it.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When a roof forming member is to be buried in a buried design position of an underground structure, a pipe is buried in advance from a start side to an arrival side, and the first roof forming member is used as a guide as a guide. Promote and bury. At this time, the two pipes are buried at a constant interval in the horizontal direction, and the opposing side surfaces of these pipes are used as a guide between the two pipes.
2 the roof member, with the exclusion of its opposing upper and lower horizontal flange portion having a rectangular cross section portion of the earth and sand surrounded by the upper and lower horizontal flange portion and web portion to and facing in the state of being joined integrally with each other When buried, workability is improved.

Then, the front end (front end) of the next roof forming member is brought into contact with the rear end of one pipe, and guide pieces projecting from the upper and lower horizontal flange portions of the roof forming member are embedded first. When the roof forming member is propelled toward the arrival side in a state in which it is engaged with the opposed inner surfaces of the upper and lower horizontal flange portions of the roof forming member, the pipe is pushed out to the arrival side and the roof forming member is moved by the guide piece. Is engaged with the upper and lower horizontal flange portions of the already buried roof forming member, so that it is propelled while the movement in the vertical direction is restricted, and the tip of the roof forming member is buried earlier. By forming it on the inclined end that is cut off diagonally forward toward the side ,
At the time of propulsion, the roof forming member is pressed in a direction in which the roof forming member comes into close contact with the already buried roof forming member side due to the earth pressure applied to the inclined end portion.

After the roof-forming member is buried, the next roof-forming member is propelled and buried in the same manner as described above, except that the guide member of the roof-forming member is placed on the opposed inner surfaces of the upper and lower horizontal flange portions of the roof-forming member. This is performed while fitting and engaging.
At this time, a rectangular cross section is formed by the upper and lower horizontal flange portions and the web portion of the roof forming member buried earlier and the roof forming member to be buried next, and the sediment is taken into the rectangular cross section. since the roof forming member is embedded in the, or drilling with the drilling tool a screw auger or the like for inserting the sediment in the cross section rectangular section, or disrupting the soil by the water Daetto like, relaxation, eliminate.

When the earth and sand in the rectangular section is excavated or relaxed, not only the propulsion of the roof forming member is performed more smoothly, but also the web section of the roof forming member being propelled has the following meanings. Since the earth pressure acts on the surface of the web portion on the opposite side, the roof forming member is positively pressed against the previously buried roof forming member side, and accurate propulsion and embedding can be performed.

The roof forming member is repeatedly propelled and buried, thereby forming a roof having a width equal to the width of the upper floor at the upper floor buried design position of the underground structure. An edge plate is mounted on the upper surface of the upper horizontal flange portion of the roof forming member, and the leading edge of the edge plate is fixed to the tip of the roof forming member. The front end of the edge cutting plate is cut off from the front end of the forming member, and the rear end (base end) is fixed in place on the starting side. Thereafter, the underground structure is propelled along the lower surface of the edge cutting plate while excavating the ground in front with the upper floor front end surface of the underground structure facing the rear end of the roof formed by the juxtaposed roof forming members. Then, the underground structure is built underground by extruding the roof to the arrival side.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a road and a road (hereinafter referred to as "road") A on both sides of a road A; When constructing an underground structure F communicating with
As shown in the figure, after the starting shaft B and the reaching shaft C are excavated on both sides of the road A, the underground structure F from the starting shaft B is excavated.
Roof forming members 1 at the landfill design position of the upper floor F1
Are propelled and buried so as to be parallel to each other in the lateral direction (the width direction of the upper floor portion F1) to form a roof R having a width substantially equal to the width of the upper floor portion F1. Thereafter, the upper floor F1 of the underground structure F is brought into contact with the rear end of the roof R, and while excavating the ground in front of the underground structure F, as shown in FIG.
By embedding the roof R, the roof R is pushed out to the reaching shaft C and removed, and the underfloor structure F is constructed by replacing the upper floor F1 of the underground structure F with the roof R.

In the method of constructing the underground structure F as described above, the present invention has a feature in the method of forming the roof R. As the roof forming member 1, as shown in FIGS. Horizontal flanges 1b, 1c having a fixed width at both ends at the upper and lower ends of the web 1a with the section steel turned sideways
The upper and lower horizontal flanges 1b and 1c are formed by integrally forming the upper and lower horizontal flanges 1b and 1c with the tips (front ends) obliquely rearward from one end face to the other end face. And one half of the guide piece 3 made of a rectangular steel plate is fixed to the opposing surface at one end of the top end of the upper and lower horizontal flanges 1b and 1c. The other half of the guide piece 3 is horizontally projected outward.

On the upper surface of the upper horizontal flange portion 1b of the roof forming member 1, a thin plate 4 made of a thin steel plate having the same shape as the entire surface except the inclined end portion 2 is placed. 4 is integrally fixed to the tip of the horizontal flange portion 1b by welding. When the distance between the start-side shaft B in which the roof-forming member 1 is embedded and the arrival-side vertical shaft C is long, a fixed-size roof formed by dividing a long roof-forming member corresponding to the length is used. The forming members are sequentially added.
In this case, the roof forming member 1 'having the inclined end portion 2 and the roof forming member 1 successively added to the roof forming member 1 is formed in a flat rectangular shape without the inclined end portion 2. At the time of embedding, the front end surface is integrated with the rear end surface of the roof forming member 1 on the front side by welding, and the edge cutting plate 4 mounted on the upper surface of the horizontal flange portion 1b is also integrated with the front edge cutting plate 4 by welding. It is to make it. The roof forming members may be joined to each other with bolts via connecting plates.

In order to form the roof R at the embedded design position of the upper floor F1 of the underground structure F using the roof forming member thus configured, first, at the embedded design position of the upper floor F1 of the underground structure F, At one end, the roof forming member 1 is propelled and buried from the start-side shaft B so as to penetrate between the arrival-side shafts C. In this case, prior to the propulsion and embedding of the roof forming member 1, a guide pipe having a circular cross section is buried between the shafts B and C at one side of the underfloor structure F at the embedding design position of the upper floor F1. It is desirable that the roof forming member 1 is propelled and buried along the guide pipe.

When a guide pipe is used, the roof forming member 1 may be propelled and buried along the side surface of one guide pipe. However, as shown in FIGS. As described above, the two guide pipes 5a and 5b are buried at an interval where the two roof forming members can be inserted in a parallel state, and between these guide pipes 5a and 5b, FIGS. As shown in FIG. 10, the roof forming members 1 ', 1' are joined in a side-by-side state and propelled and buried from the starting shaft B. At this time, the upper and lower horizontal flange portions 1b and 1c of the roof forming members 1 'and 1' are joined to each other by joining the opposing end surfaces of the upper and lower horizontal flange portions in abutting state, and the side surfaces of the web portion 1a facing the guide pipe side and the side surfaces thereof. A guide pipe 5 opposing a U-shaped section formed by upper and lower horizontal flange portions 1b and 1c protruding from the web 1a toward the guide pipe side.
The sliding contact is made in a state of straddling the opposite side portions of a and 5b.

Further, a cross section surrounded by opposing surfaces of the web portions 1a, 1a of the roof forming members 1 ', 1' and upper and lower horizontal flange portions 1b, 1c projecting from the web portions 1a, 1a in the respective directions. pressing jack 8 installed in the starting pit B side while drilling ahead ground of the rectangular cross section 6 by the screw auger 7 by inserting the screw auger 7 to the rectangular portion 6 (Fig. 1
(See below). When the length between both shafts B and C is longer than the roof forming member 1 ', the roof forming members 1' and 1 '
After adding 1 'and integrating by welding, it is propelled and buried between both guide pipes 5a and 5b, and the roof forming members 1' and 1 'are arranged in two rows in a state between both shafts B and C. Buried. The edge plate 4 is mounted on the roof forming member 1 'as described above.

Next, as shown in FIGS. 11 and 12, the roof forming member 1 having the tip end formed on the inclined end portion 2 is replaced with the other roof in the two rows of the roof forming member rows previously embedded. The roof forming member 1 is disposed in the starting shaft B along the other side of the forming member row, and the front end face of the roof forming member 1 is brought into contact with the rear end face of the guide pipe 5b on the roof forming member row side, and the guide pieces 3, 3 are respectively engaged with the opposing surfaces of the upper and lower horizontal flange portions 1b and 1c of the roof forming member row, and the upper and lower sides of the roof forming member 1 to be embedded in the other end faces of the upper and lower horizontal flange portions 1b and 1c of the roof forming member row. Horizontal flange 1b,
While being in sliding contact with 1c, it is propelled and embedded by the pressing jack 8.

When the roof forming member 1 is propelled, the front end portion of the roof forming member 1 is formed at an inclined end portion 2 which is cut off diagonally forward toward the roof forming member row which has been buried earlier. Not only does the tip end become a sharp end, so that it propells smoothly, but also the earth pressure applied to the inclined end surface of the inclined end portion 2 in the direction of pushing the roof forming member 1 against the roof forming member row embedded earlier in accordance with the propulsion. Then, the guide pieces 3,
3 is accurately propelled and buried along the roof-forming member row while securely engaging the upper and lower horizontal flange portions 1b and 1c of the roof-forming member row with the upper surface. In addition, the horizontal flange portion 1 of this roof forming member row
The engagement between the opposing inner surfaces of b and 1c and the guide pieces 3 and 3 restricts vertical delusion, and the upper surfaces of the horizontal flange portions 1b and 1b of the roof forming member row and the roof forming member 1 are flush with each other in the horizontal direction. Can be Further, since the guide pipe 5b on the other side is pushed out to the arrival side shaft C by the propulsion of the roof forming member 1, the guide pipe 5b is removed.

If the length of the roof forming member 1 is shorter than the underground structure F to be constructed, the roof forming member 1
After the propulsion and embedding, the roof forming member 1 ′ having no inclined end 2 as described above is added and the guide pieces 3, 3
Are sequentially propelled, buried, and connected in series in the same manner as described above while engaging the inner surfaces of the opposed upper and lower horizontal flange portions 1b, 1c of the roof forming member 1 'previously buried.
1 ′ is buried between both shafts B and C to form a roof forming member row. In addition, on the upper surfaces of the roof forming members 1, 1 ', edge cutting plates 4, 4 connected to each other are placed.

Next, the propulsion of the next row of roof forming members,
Perform burial work. In this operation, as shown in FIGS. 13 and 14, the roof forming member 1 having the front end formed on the inclined end 2 is first moved to the starting shaft B side adjacent to the previously buried roof forming member row. From, buried. At this time, the screw auger is inserted from the starting shaft C into the rectangular section 6 surrounded by the web section 1a and the upper and lower horizontal flange sections 1b and 1c facing the roof forming member 1 and the row of the roof forming members embedded earlier. 7 is inserted, and the front ground of the roof forming member 1 is propelled by the pressing jack 8 while excavating.

The above-mentioned rectangular cross section by the screw auger 7
Drilling of the front ground parts 6 are those performed for a thin soil layer of the lower of the road A by the pressing of the ground by the distal end surface of the roof member 1 are prevented from rise upwards, thus, a rectangular cross-section portion Some earth and sand may infiltrate into 6. Further, due to the excavation, the earth pressure on the other side portion in contact with the ground increases more than the rectangular section 6 of the roof forming member 1 being buried, and the earth pressure is increased by the web 1a of the roof forming member 1.
While acting on the other side surface, the roof forming member 1 can be accurately propelled and embedded along the roof forming member row while pressing the roof forming member 1 toward the already embedded roof forming member row. That is, the guide pieces 3 and 3 of the roof forming member 1 to be buried are positively engaged with the opposed inner surfaces of the upper and lower horizontal flange portions 1b and 1c of the roof forming member row, and the guide piece 3 and the horizontal flange of the roof forming member row are positively locked. It is propelled and buried while preventing earth and sand from entering between the parts 1b and 1c.

After the roof forming member 1 is propelled and buried, the roof forming member having no inclined end 2 as described above is provided.
1 'and the screw auger 7 are also extended, and the guide pieces 3, 3 are engaged with the inner surfaces of the upper and lower horizontal flange portions 1b, 1c of the roof forming member row, which are previously embedded, while propelling and embedding in the same manner as described above. Then, a plurality of roof forming members 1, 1 'connected in series are buried between both shafts B and C in a penetrating state to form a roof forming member row.

The work of embedding the roof forming member row from this roof forming member row is the same as that of the roof forming member, that is, the upper and lower horizontal flange portions 1b and 1c of the roof forming member of the roof forming member row previously buried. A roof forming member row in which the guide pieces 3, 3 are buried in such a manner that upper and lower horizontal flange portions 1b, 1c of the roof forming members 1, 1 'to be buried while being added in series are brought into sliding contact with each other. The front ground of the rectangular section 6 formed by the roof forming member row buried in this state and the roof forming member being buried in this state is excavated by the screw auger 7 while being engaged with the upper and lower horizontal flange portions 1b and 1c. Promotion To be buried.

Thus, the road A between the shafts B and C is
After forming a roof R composed of a plurality of rows of roof forming members below, as is well known, the front end of the edge cutting plate 4 on the roof forming member projecting to the arrival side shaft C is moved from the front end of the roof forming member. Resection to release the fixation and start shaft B
In FIG. 2, the rear end of the edge cutting plate 4 is fixed in place of the shaft B by fixing means 9 such as a wire as shown in FIG. Thereafter, in the starting shaft B, the blade opening 10 is inserted into the opening at the front end.
The front end surface of the upper floor F1 of the underground structure F equipped with the abutment is brought into contact with the rear end surface of the roof R, and the upper end of the cutting edge 10 supports the rear end of the roof forming member.

In this state, a plurality of jacks 12 are provided between the reaction force supporting member 11 installed in the shaft B and the rear end face of the underground structure F.
When these jacks 12 are extended with the
While excavating the front ground by 10, the underground structure F advances a predetermined length along the lower surface of the edge plate 4, and the roof forming members 1, 1 ′ pushed out to the arrival side shaft C by this advance are sequentially cut off and removed. I do. In this way, the roof R is replaced with the upper floor F1 of the underground structure F, and the underground structure F is buried and built under the road between the shafts B and C. When the underground structure F is long, the underground structure F may be divided in the length direction, and each division may be sequentially advanced. In addition to the means for advancing, other than the propulsion by the jacks 12 and 12, the pulling may be performed from the other shaft C side by an appropriate traction means using a wire rope or the like.

In the above-described embodiment, the thin ground layer below the road A is prevented from rising upward due to the pressing of the ground by the tip end surface during the propulsion of the roof forming member, and the soil is provided on the side of the roof forming member. In order to apply pressure, the side end surfaces of the upper and lower horizontal flange portions 1b and 1c of the previously buried roof forming member row were brought into contact with the opposite side end surfaces of the upper and lower horizontal flange portions 1b and 1c of the roof forming member to be buried next. When propelled and buried in the state, the front ground of the rectangular section 6 surrounded by the opposing web portion 1a and the upper and lower horizontal flange portions 1b and 1c of the roof forming member adjacent to the left and right is excavated by a screw auger or the like. Although the excavation is performed by using the excavation means 7, the same operation and effect can be obtained by relaxing the earth and sand which infiltrate into the rectangular section 6 instead of such excavation means.

That is, as shown in FIG. 15, when the roof forming member 1 is propelled and buried in contact with the side of the already buried roof forming member row, the pipe 13 is inserted into the rectangular section 6. By supplying air or water to the pipe 13 from the starting shaft B, an air jet or a water jet is jetted from the tip of the pipe 13, and the jet relaxes the sediment invading into the rectangular section 6. , May be eliminated. In addition,
The insertion of the pipe 13 into the rectangular section 6 may be performed from the reaching shaft C as shown in FIG.

Further, as means for propelling the roof forming member,
Although it is performed by the pushing jack 8 from the start side shaft B, it may be performed by towing from the arrival side shaft C. As such a traction means, a rope such as a rope is previously attached to the tip of the roof forming member 1, and the rope is moved along the side of the roof forming member 1 on the side in contact with the ground. After the roof forming member 1 is buried up to the arrival-side shaft C in the laid state, the rear end portion of the cable provided through the ground from the arrival-side shaft C to the starting-side shaft B is placed in the next row. The roof forming member 1 can be propelled from the starting side shaft B by being attached to the tip of the roof forming member 1 and pulling the rope from the arrival side shaft C.

[0030]

As described above, according to the method for forming a roof for building underground structures according to the present invention, the roof forming member has a cross section having an E-shaped cross-section formed integrally with upper and lower ends of the web portion. Since it is made of steel, it can be obtained at a lower cost than roof forming members made of steel rectangular pipes, and can not only reduce construction costs, but also reduce earth pressure resistance when propelled and buried underground. Smaller and smoother propulsion construction becomes possible.

Further, when the propulsion and embedding are performed in a state where the side end surfaces of the upper and lower horizontal flange portions of the roof forming member to be buried next are in contact with the side end surfaces of the upper and lower horizontal flange portions of the roof forming member previously buried. Rectangular section surrounded by opposed upper and lower horizontal flange portions and web portion of the roof forming member
Drilling soil in part, eliminated or relaxed while promoting, I'll be embedded not only promote the roof forming member is more smoothly carried out, the web portion of the roof member in the promotion, rectangular cross section Since the earth pressure acts on the surface of the web portion on the side opposite to the above, the roof forming member is positively pressed against the previously buried roof forming member side, and accurate propulsion and embedding can be performed. .

[Brief description of the drawings]

FIG. 1 is a simplified longitudinal side view of a state in which a roof forming member is propelled and embedded.

FIG. 2 is a simplified vertical sectional side view showing a state where a roof is replaced with an underground structure.

FIG. 3 is a simplified vertical sectional front view of a roof formed in the ground,

FIG. 4 is a side view of a roof forming member,

FIG. 5 is a plan view thereof,

FIG. 6 is a longitudinal sectional front view thereof,

FIG. 7 is a simplified longitudinal front view of two guide pipes buried underground,

FIG. 8 is a plan view thereof,

FIG. 9 is a simplified vertical sectional front view showing a state where a roof forming member is embedded between two guide pipes;

FIG. 10 is a plan view thereof,

FIG. 11 is a simplified longitudinal front view of a roof forming member being propelled and buried along a roof forming member row,

FIG. 12 is a plan view thereof,

FIG. 13 is a simplified longitudinal sectional front view of the next row of roof forming members being propelled and embedded.

FIG. 14 is a plan view thereof,

FIG. 15 is a partially cutaway simplified plan view showing a state in which earth and sand in a rectangular section are relaxed;

FIG. 16 is a partially cut-away simplified plan view showing a modified example thereof;

FIG. 17 is a simplified vertical side view showing a conventional example,

FIG. 18 is a simplified longitudinal front view of the pipe roof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 1 'Roof forming member 1a Web part 1b, 1a Upper and lower horizontal flange part 2 Inclined end part 3 Guide piece 4 Edge cutting plate 6 Cross-sectional rectangular part 7 Screw auger A Road B Start-side pit C Reach-side pit F Underground structure R roof

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 9/04

Claims (7)

(57) [Claims] 1. A method of forming a roof comprising a plurality of elongated roof forming members arranged in parallel at an embedded design position of an underground structure, wherein the roof forming members are provided at upper and lower ends of a web portion. A horizontal flange portion is integrally provided, and is made of an E-shaped section steel. An edge plate is placed on the upper surface of the upper horizontal flange portion of the roof forming member, and the tip of the edge plate is attached to the roof forming member. In a state where the roof-forming member is fixed to the tip, the roof-forming member is propelled and buried in the ground from the start side to the arrival side of the buried design position of the underground structure in a penetrating state, and is adjacent to the buried roof-forming member. Similarly, when propelling and embedding the next roof forming member on which the edge cutting plate is mounted with the side end surfaces of the upper and lower horizontal flange portions facing each other in contact with each other ,
The upper and lower horizontal flange portions of these roof forming members facing each other
To remove sediment in the rectangular cross-section surrounded by
A method of forming a roof for building an underground structure, wherein the roof is formed by arranging a plurality of roof forming members side by side while repeatedly propelling and burying the roof. 2. When propulsion and embedding are performed in a state where the side end surfaces of the upper and lower horizontal flange portions of the roof forming member to be buried next are in contact with the opposite side end surfaces of the upper and lower horizontal flange portions of the roof forming member to be buried earlier. the opposing upper and lower horizontal flange portion and a rectangular cross-section portion surrounded by the web portion of the roof member propulsion while relaxing sediment, the underground construction building roof according to claim 1, wherein the embedding Forming method. 3. A soil removing means of rectangular section portion surrounded by the upper and lower horizontal flanges and the web portion opposite in adjacent roof forming member, characterized in that a screw auger for insertion into the rectangular cross section portion The method for forming a roof for building underground structures according to claim 1 . 4. A soil loosening means rectangular section portion surrounded by the upper and lower horizontal flanges and the web portion opposite in adjacent roof forming member, that is the water jet means for inserting into the rectangular cross section portion Claim 1.
A method for forming a roof for building underground structures according to claim 2 . 5. A soil loosening means rectangular section portion surrounded by the upper and lower horizontal flanges and the web portion opposite in adjacent roof forming member, characterized in that it is a Eajietto means for inserting into the rectangular cross section portion Claim 1 or
A method for forming a roof for constructing an underground structure according to claim 2 . 6. An underground structure is disposed at a site where the underground structure is to be buried.
A roof consisting of a plurality of long roof forming members arranged side by side
Wherein the roof forming member has a web portion.
E-shaped cross section with horizontal flanges integrally provided at the upper and lower ends
The upper horizontal flange of this roof forming member
Place the edge plate on the upper surface of the
The roof forming part is fixed to the tip of the roof forming member.
Between the start side and the arrival side of the underground structure
It was propelled, buried, and buried underground throughout the ground.
Next, the edge plate is placed adjacent to the
Upper and lower horizontal flanges facing each other roof forming members
Propelled and buried with the side end faces of
By repeatedly performing the operation, multiple roof forming members
When forming a roof, the first embedding of the roof forming member is performed by adding a pipe facing the pipe side of the roof forming member in advance to a pipe that has been embedded from the starting side to the arrival side.
Side of the web part and the top and bottom horizontal protruding from the web to the pipe side
Slide the U-shaped section formed with the flange
A method for forming a roof for constructing an underground structure, wherein the roof is propelled and buried. 7. An underground structure is disposed at a site where the underground structure is buried.
A roof consisting of a plurality of long roof forming members arranged side by side
Wherein the roof forming member has a web portion.
E-shaped cross section with horizontal flanges integrally provided at the upper and lower ends
The upper horizontal flange of this roof forming member
Place the edge plate on the upper surface of the
The roof forming part is fixed to the tip of the roof forming member.
Between the start side and the arrival side of the underground structure
It was propelled, buried, and buried underground throughout the ground.
Next, the edge plate is placed adjacent to the
Upper and lower horizontal flanges facing each other roof forming members
Propelled and buried with the side end faces of
By repeatedly performing the operation, multiple roof forming members
When the roof is formed, the first roof forming member is buried in advance by embedding two pipes from the start side to the arrival side at a predetermined interval in the lateral direction. Between the two pipes using the opposed side surfaces as guides, the two roof forming members are integrally joined to the upper and lower horizontal flange portions facing each other, and are surrounded by the opposed upper and lower horizontal flange portions and the web portion. underground construction method of forming a building roof, characterized in that the buried while eliminating sediment rectangular cross-section portion has.