JP2023122049A - Shoring joint structure, shoring connecting member, and shoring assembly method - Google Patents

Abstract

To provide a shoring joint structure capable of improving the workability and safety during shoring construction at a lower cost, a shoring connecting member, and a shoring assembly method.SOLUTION: A shoring connection method is a method using a shoring joint structure, a support joint structure 4 that connects a pair of opposing left and right steel supports 3, 3 including an insertion pin 5 protruding from the end of steel support 3 and a receiving pipe 6 installed in parallel with the insertion pin 5 at the end of the steel support 3. The insertion pin 5 of one steel support 3 is inserted into the receiving pipe 6 of the other steel support 3.SELECTED DRAWING: Figure 2

Description

The present invention relates to a shoring joint structure, a shoring connecting member and a shoring assembly method.

In tunnel construction by NATM, the ground surface exposed by tunnel excavation is closed early with shoring. Tunnel shoring consists of shotcrete sprayed onto the ground surface, steel shoring assembled along the ground surface, and rock bolts that are driven into the ground in the normal direction from the inside of the tunnel, etc. It is generally composed of The shoring is installed by spraying the primary shotcrete onto the ground exposed by excavation, assembling the steel shoring, and then spraying the secondary shotcrete.

When assembling the steel shoring, heavy machinery such as a drill jumbo is used to hold the steel shoring while the left and right steel shoring are placed near the top of the face, and the bolts are manually tightened. It is common to work On the other hand, manual fastening of bolts is time-consuming and requires the work to be performed directly under the bare ground or primary shotcrete before the shoring is completed.

Therefore, construction methods have been disclosed for the purpose of improving workability and safety during construction of shoring. For example, in Patent Document 1, of a pair of left and right steel shorings, a male connecting portion is attached to the end (joint portion) of one of the steel shorings, and the end (joint portion) of the other steel shoring is ), and using an erector device having a pair of hands capable of gripping the steel shoring, the joints of the left and right steel shoring are butted against each other to form a male A method of constructing a tunnel is disclosed in which a mold joint and a female joint are fitted together and steel shoring erected in an arch along the face is erected.

Japanese Patent No. 6374051

In the tunnel construction method described in Patent Document 1, by inserting the male coupling portion into the female coupling portion, they are configured to mesh with each other. The male and female couplings, which are formed so as to mesh with each other, are complicated in shape or are formed by combining a plurality of members, and therefore are laborious to manufacture, resulting in high manufacturing costs.

INDUSTRIAL APPLICABILITY The present invention is a shoring joint structure, a shoring connecting member, and a shoring connecting method, which make it possible to improve workability and safety during shoring construction and to reduce costs. The task is to propose

The shoring joint structure of the present invention, which solves such problems, comprises an insertion pin projecting from the end of a steel shoring and a receiving pipe arranged in parallel with the insertion pin at the end of the steel shoring. By inserting the insertion pin of one of the steel shorings into the receiving pipe of the other steel shoring, the cores of the pair of opposing left and right steel shorings are aligned. The steel shorings are connected to each other in a state where they are laid.

According to such a shoring joint structure, simple steel shorings can be connected to each other simply by inserting the insertion pin into the receiving pipe. Therefore, the erector device having a pair of hands capable of gripping the steel shoring can be used to connect the steel shoring without requiring manual bolt fastening work, and the shoring is completed. Eliminates manual work directly under previous exposed ground or primary shotcrete. Moreover, since the insertion pin is simply inserted into the receiving pipe, there is no need to complicate the shapes of the insertion pin and the receiving pipe, and the manufacturing cost is relatively low.

As such a shoring joint structure, in the steel shoring having an H-section steel and a joint plate welded to the tip of the H-section steel, the joint plate includes the insertion pin and the receiving pipe. A through hole is formed corresponding to the position of, the insertion pin passes through the through hole and is welded to one surface of the web of the steel shoring, and the receiving pipe is , one end of which is welded to the joint plate and the other end of which is welded to the other side of the web. In such a shoring joint structure, the joint plates are pressure-bonded to each other with the insertion pin inserted into the receiving pipe.

Further, as another shoring joint structure, the shoring joint plate of the steel shoring having an H-shaped steel and a shoring joint plate welded to the tip of the H-shaped steel is used. The shoring connecting member may be fixed.
The shoring connecting member of the present invention is fixed to the ends of a pair of opposing left and right steel shorings to connect the steel shorings, and comprises a main body made of H-section steel, and the main body a bearing plate fixed to the distal end of the main body portion; a connecting member joint plate fixed to the proximal end of the main body portion; an insertion pin fixed to one surface of the web of the main body portion; and the other surface of the web. a through hole through which the insertion pin can be inserted is formed in the bearing pressure plate at a position corresponding to the insertion pin and the receiving pipe, and the insertion pin faces the other It passes through the through hole so that it can be inserted into a receiving pipe of another shoring connecting member fixed to the tip of the steel shoring.

The use of the shoring connecting member eliminates or minimizes the need for machining the steel shoring to provide the insertion pins and receiving pipes. Therefore, it is possible to omit the labor required for processing the steel shoring, and to reduce the cost. In such a shoring joint structure, the bearing plates are pressure-bonded to each other while the insertion pin is inserted into the receiving pipe.

If a bolt is fixed to the connecting member joint plate corresponding to the position of the through hole formed in the joint plate for shoring formed at the end of the steel shoring, the shoring joint The shoring connecting member can be fixed to the steel shoring by inserting a bolt into the through-hole of the plate and screwing a nut. Therefore, it is easy to attach the shoring connecting member to the steel shoring.

Moreover, when a groove is formed in the side surface of the insertion pin, it is desirable that the receiving pipe is provided with a locking member that can be inserted into the groove. With this configuration, by inserting the insertion pin into the receiving pipe, the groove engages with the locking member, and the insertion pin is prevented from coming out. Therefore, it is not necessary to repeat the work of inserting the insertion pin into the receiving pipe again if the insertion pin comes out for some reason during assembling the shoring.

Further, in the method of assembling a shoring of the present invention, a pair of opposing steel shorings are connected, and an insertion pin protruding toward the other steel shoring is provided at the tip of the steel shoring. , and a receiving pipe having an inner diameter into which the insertion pin can be inserted are arranged in parallel, and the insertion pin fixed to one of the steel shorings is connected to the By inserting it into the receiving pipe, the steel shorings are connected to each other.

According to such a shoring assembling method, steel shorings can be easily connected to each other. In addition, since there is no need to manually tighten the bolts, it is possible to connect the steel shoring using an erector device having a pair of hands capable of gripping the steel shoring. It is possible to omit manual work directly under the exposed ground or primary shotcrete.

When using a shoring connecting member, the operation of fixing the shoring connecting member to which the insertion pin and the receiving pipe are fixed to the tip of the steel shoring is performed by connecting the steel shorings together. before the work to be done.

According to the shoring joint structure, the shoring connecting member, and the shoring connecting method of the present invention, it is possible to improve workability and safety during shoring construction.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline|summary of the tunnel which concerns on 1st embodiment, Comprising: (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the shoring joint structure of 1st embodiment, Comprising: (a) is a front view, (b) is sectional drawing. BRIEF DESCRIPTION OF THE DRAWINGS It is an exploded view of the shoring joint structure of 1st embodiment, Comprising: (a) is a front view, (b) is sectional drawing. It is a figure which shows the outline|summary of the tunnel which concerns on 2nd embodiment, Comprising: (a) is a cross-sectional view, (b) is a longitudinal cross-sectional view. It is a figure which shows the shoring joint structure of 2nd embodiment, Comprising: (a) is a front view, (b) is sectional drawing. FIG. 4 is an exploded view of the shoring joint structure of the second embodiment, where (a) is a front view and (b) is a cross-sectional view.

In this embodiment, a case of tunnel construction by NATM will be described. As shown in FIGS. 1(a) and 1(b), the tunnel T is constructed by shoring 1 consisting of shotcrete 2, steel shoring 3, etc., on the ground surface Gs exposed by excavating the ground G. Stabilization is achieved by occlusion. In addition, when constructing a tunnel, auxiliary construction methods such as fore-poling (pre-construction work for short lengths), mirror bolting, leg reinforcement, etc. may be used in combination, if necessary.

In tunnel construction, first, the natural ground G is excavated to form an excavation hole (tunnel T) (excavation step). The excavation method of the tunnel T is not limited, and may be, for example, blast excavation or mechanical excavation. The excavation length of the tunnel T for each cycle is determined according to the natural ground conditions (natural ground grade, overburden, etc.), and is set to 1.0 to 1.2 m in this embodiment.

After excavating the tunnel T to a predetermined length (1.0 to 1.2 m in this embodiment), the ground G is excavated to form the shoring 1 along the ground surface Gs exposed. The shoring 1 of this embodiment includes a shotcrete 2 composed of a primary shotcrete 21 and a secondary shotcrete 22 and a steel shoring 3 . Construction of the shoring 1 includes primary spraying work, shoring assembly work, and secondary spraying work.

In the primary spraying work, primary shotcrete 21 is sprayed onto the ground surface Gs exposed by excavating the ground G. As shown in FIG. The primary shotcrete 21 is sprayed on the face K in addition to the wall surface (side surface) of the tunnel T. The thickness of the primary shotcrete 21 may be appropriately determined.

In the shoring assembly work, the steel shoring 3 is arranged along the surface (or ground surface Gs) of the primary shotcrete 21 in the vicinity of the face K. In the shoring assembly work, a pair of left and right steel shorings 3, 3 facing each other are erected in the pit, and the steel shorings 3 are connected to each other at the top. The steel shorings 3 are connected via a shoring joint structure 4 .

The steel shoring 3 is made of H-shaped steel bent along the inner wall surface of the tunnel T, and a joint plate 31 is fixed to the upper end of the steel shoring 3. A bottom plate 32 is fixed to the lower end of the shoring 3 .

The shoring joint structure 4, as shown in FIGS. 5 and a receiving pipe 6 arranged in parallel. The insert pin 5 is welded to the joint plate 31 and to one side of the web 33 of the steel shoring 3 . The receiving pipe 6 is a cylindrical member having an inner diameter capable of inserting the insertion pin 5 , and has one end welded to the joint plate 31 and the other end welded to the other surface of the web 33 .

As shown in FIGS. 3(a) and 3(b), the joint plate 31 fixed to the end of the steel shoring 3 has through holes 34, 34 corresponding to the positions of the insertion pin 5 and the receiving pipe 6. is formed. The through hole 34 has a diameter through which the insertion pin 5 can be inserted (for example, a diameter equivalent to the inner diameter of the receiving pipe 6). The insertion pin 5 penetrates through the through hole 34 and protrudes toward the other steel shoring. The receiving pipe 6 faces the through hole and opens toward the other steel shoring.

As shown in FIGS. 2(a) and 2(b), the opposing steel shorings 3, 3 have the insertion pin 5 of one steel shoring 3 inserted into the receiving pipe 6 of the other steel shoring 3. Concatenate by inserting. The tip of the insertion pin 5 has a conical shape with a diameter that decreases toward the tip so that it can be easily inserted into the receiving pipe 6 . Further, the length of protrusion of the insertion pin 5 from the joint plate 31 is longer than the length of the receiving pipe 6, and when it is inserted into the receiving pipe 6, the tip (conical portion) protrudes from the base end of the receiving pipe 6. do.

After the steel shoring 3 is assembled, the secondary shotcrete 22 is sprayed toward the side of the tunnel T (secondary spraying work).

As described above, according to the shoring joint structure 4 of the present embodiment and the shoring assembling method using the same, simply inserting the insertion pin 5 into the receiving pipe 6 allows the simple steel shorings 3 to be connected. Therefore, the steel shoring 3 can be connected by using an erector device having a pair of hands capable of gripping the steel shoring 3 without requiring manual bolt fastening work. It is possible to omit manual work directly under the exposed natural ground or the primary shotcrete 21 before the is completed.

In addition, since the insertion pin 5 is simply inserted into the receiving pipe 6, there is no need to complicate the shapes of the insertion pin 5 and the receiving pipe 6, and the manufacturing cost is relatively low. Since the joint plates 31 of the steel supports 3 arranged on the left and right sides are pressure-bonded to each other, the ability as an arch-shaped support structure can be fully exhibited.

In addition, since only the formation of the through holes 34 in the joint plate 31 and the fixing of the insertion pins 5 and the receiving pipes 6 to the web 33 are completed, the processing of the steel shoring 3 can be minimized. Therefore, it is possible to reduce labor during manufacturing, and there is no fear of lowering the yield strength due to lowering the steel shoring 3 .

<Second embodiment>
In the second embodiment, as shown in FIG. 4( a ), the end surfaces (joint plates 31 ) of the steel shorings 3 are connected to each other by connecting the steel shorings 3 via the shoring connecting member 7 . This is different from the shoring joint structure 4 of the first embodiment, which is joined in the abutted state. The details of the primary spraying work and the secondary spraying work are the same as the contents shown in the first embodiment, so detailed explanations are omitted.

In the shoring assembly work, as shown in FIG. 4(b), the steel shoring 3 is placed along the surface of the primary shotcrete 21 (or ground surface Gs) in the vicinity of the face K. In the shoring assembly work, a pair of left and right steel shorings 3, 3 facing each other are erected in the pit, and the steel shorings 3 are connected to each other at the top (see FIG. 4(a)). The steel shorings 3 are connected via a shoring joint structure 4 .

The shoring joint structure 4 comprises a shoring connecting member 7 fixed to the steel shoring 3, as shown in FIGS. 5(a) and 5(b). The shoring connecting member 7 is fixed to the tip (upper end) of the steel shoring 3, and the steel shorings 3 are connected to each other by connecting the shoring connecting members 7 to each other.

The steel shoring 3 includes an H-shaped steel bent along the inner wall surface of the tunnel T, a joint plate (shoring joint plate) 31 welded to the upper end of the H-shaped steel, and an H-shaped It consists of a bottom plate 32 welded to the lower end of steel. A pair of through holes 34 , 34 are formed in the joint plate 31 .

As shown in FIGS. 6( a ) and 6 ( b ), the shoring connection member 7 includes a body portion 71 made of H-shaped steel, a bearing plate 72 fixed to the tip of the body portion 71 , and a base of the body portion 71 . A coupling member joint plate 73 fixed to one end, an insertion pin 5 passing through the bearing plate 72 and welded to one surface of a web 74 of the body portion 71 , and one end welded to the bearing plate 72 . and a receiving pipe 6 whose other end is fixed to the other surface of the web 74 .

A through hole 75 through which the insertion pin 5 can be inserted is formed in the bearing plate 72 at a position corresponding to the insertion pin 5 and the receiving pipe 6 . The tip of the insertion pin 5 is inserted into the through hole 75 of the bearing plate 72 so that it can be inserted into the receiving pipe 6 of the other shoring connecting member 7 fixed to the tip of the steel shoring 3 facing it. penetrates. Also, the proximal end portion of the insertion pin 5 is welded to the body portion 71 (web 74). The receiving pipe 6 is welded to the body portion 71 (web 74 ) while being open facing the through hole 75 .

A bolt 76 projecting toward the joint plate 31 (shoring joint plate) is fixed to the connecting member joint plate 73 . The bolt 76 is fixed at a position corresponding to the position of the through hole 34 of the joint plate 31 formed at the end of the steel shoring 3 . The bolt 76 of the present embodiment is a cross-cut bolt fixed to the connecting member joint plate 73 . The bolt 76 is arranged side by side on the outside of the insertion pin 5 or the receiving pipe 6 (on the side opposite to the web 74 ) in the space surrounded by the flange of the body portion 71 and the web 74 .

In the shoring assembly work, first, the shoring connection member 7 is fixed to the joint plate 31 of the steel shoring 3 . As shown in FIGS. 5(a) and 5(b), the shoring connecting member 7 is fixed by inserting the bolt 76 fixed to the connecting member joint plate 73 into the through hole 34 of the joint plate 31. The joint plate 31 and the connecting member joint plate 73 are overlapped, and a nut 77 is screwed onto the bolt 76 .

After fixing the shoring connection member 7 to the tip (joint plate 31) of the steel shoring 3, the left and right steel shorings 3, 3 are raised and the steel shorings 3 are connected to each other at the top. The opposing steel shorings 3 , 3 are connected by inserting the insertion pin 5 of one shoring connecting member 7 into the receiving pipe 6 of the other shoring connecting member 7 . The tip of the insertion pin 5 has a conical shape with a diameter that decreases toward the tip so that it can be easily inserted into the receiving pipe 6 .

A groove 53 is formed in the side surface of the boundary portion between the conical distal end portion 51 of the insertion pin 5 and the cylindrical general portion 52 . On the other hand, a locking member 61 is attached to the receiving pipe 6 . The end of the locking member 61 penetrates the receiving pipe 6 and can be inserted into the groove 53 formed in the insertion pin 5 . When the insertion pin 5 is inserted into the receiving pipe 6, the locking member 61 is locked in the groove 53, making it difficult for the insertion pin 5 to come out. The locking member 61 of the present embodiment is composed of a C-shaped member (so-called D-ring or C-ring) whose end portion is passed through a hole formed in the receiving pipe 6 .

As described above, according to the shoring joint structure 4 of the present embodiment and the shoring assembly method using the same, the steel shorings 3 are connected by attaching the shoring connecting member 7 to the upper end of the steel shorings 3. It becomes possible to perform the work easily. Therefore, it is possible to connect the steel shoring 3 using an erector device having a pair of hands capable of gripping the steel shoring 3 without requiring manual bolt fastening work. It is possible to omit manual work directly under the exposed natural ground or the primary shotcrete 21 before the is completed.

Since the shoring connecting member 7 can be fixed to the steel shoring 3 by fixing it to the joint plate 31 (joint plate for shoring) via the bolt 76, the steel shoring 3 is not required to undergo a large amount of processing. don't need it. Therefore, costs can be minimized.

When the insertion pin 5 is inserted into the receiving pipe 6 , the end of the locking member 61 is locked (inserted) into the groove 53 , so that the insertion pin 5 is prevented from coming out of the receiving pipe 6 . Therefore, the insertion pin 5 is prevented from coming out due to an operation error of the machine or the like during the connection work using heavy machinery. Work efficiency can be improved.

In addition, since the insertion pin 5 is simply inserted into the receiving pipe 6, there is no need to complicate the shapes of the insertion pin 5 and the receiving pipe 6, and the manufacturing cost is relatively low. The left and right steel shorings 3 are connected to each other through a pair of shoring connecting members 7, 7 in which the bearing plates 72 are pressure-bonded to each other. able to perform sufficiently.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and each of the above-described constituent elements can be modified as appropriate without departing from the gist of the present invention.

REFERENCE SIGNS LIST 1 shoring 2 shotcrete 3 steel shoring 31 joint plate 33 web 34 through hole 4 shoring joint structure 5 insertion pin 53 groove 6 receiving pipe 61 locking member 7 shoring connecting member T tunnel

Claims (9)

A shoring joint structure for connecting a pair of opposing left and right steel shorings,
an insertion pin projecting from the end of the steel shoring;
a receiving pipe juxtaposed with the insertion pin at the end of the steel shoring;
The insertion pin of one of the steel shorings is inserted into the receiving pipe of the other steel shoring so that the cores of the steel shorings match each other, Shoring joint structure. The steel shoring has an H-shaped steel and a joint plate welded to the tip of the H-shaped steel,
Through holes are formed in the joint plate corresponding to the positions of the insertion pin and the receiving pipe,
the insertion pin passes through the through hole and is welded to one side of the web of the steel shoring;
The shoring joint structure according to claim 1, characterized in that said receiving pipe has one end welded to said joint plate and the other end welded to the other side of said web. A shoring connecting member is fixed to the joint plate of the steel shoring having an H-section steel and a shoring joint plate welded to the tip of the H-section steel,
The shoring connection member includes a main body made of H-shaped steel having a cross-sectional shape equivalent to that of the steel shoring,
a connecting member joint plate fixed to the end surface of the main body on the steel shoring side;
a bearing plate fixed to an end surface of the body opposite to the steel shoring,
Through holes are formed in the bearing pressure plate corresponding to the positions of the insertion pin and the receiving pipe,
The insertion pin passes through the through hole and is fixed to one surface of the web of the main body,
the receiving pipe has one end welded to the bearing plate and the other end fixed to the other side of the web,
The shoring joint structure according to claim 1, wherein the connecting member joint plate is fixed to the shoring joint plate in a state of being superimposed on the shoring joint plate. A bolt protruding toward the joint plate for shoring is fixed to the joint plate for connecting member,
4. The shoring joint structure according to claim 3, wherein the shoring joint plate is formed with through holes corresponding to the positions of the bolts, through which the bolts can be inserted. A shoring connecting member that is fixed to the ends of a pair of opposing left and right steel shorings and connects the steel shorings together,
a main body made of H-shaped steel;
a bearing plate fixed to the tip of the main body;
a connecting member joint plate fixed to the proximal end of the main body;
an insertion pin fixed to one side of the web of the body;
a receiving pipe fixed to the other surface of the web,
The pressure plate is formed with a through hole through which the insertion pin can be inserted at a position corresponding to the insertion pin and the receiving pipe,
The insertion pin is characterized by passing through the through-hole so as to be able to be inserted into the receiving pipe of another shoring connecting member fixed to the tip of the other steel shoring facing the steel shoring. , shoring connecting members. A bolt is fixed to the connecting member joint plate corresponding to the position of the through hole formed in the joint plate for shoring formed at the end of the steel shoring. 6. A shoring connection member according to claim 5. A groove is formed on a side surface of the insertion pin,
The shoring connecting member according to claim 5 or 6, wherein the receiving pipe is provided with a locking member that can be inserted into the groove. A shoring assembly method for connecting a pair of steel shorings facing each other, comprising:
At the tip of the steel shoring, an insertion pin protruding toward the other steel shoring and a receiving pipe having an inner diameter capable of inserting the insertion pin are arranged in parallel,
The steel shorings are connected by inserting the insertion pin fixed to one of the steel shorings into the receiving pipe fixed to the other steel shoring. , shoring assembly method. The work of fixing the shoring connecting member to which the insertion pin and the receiving pipe are fixed to the tip of the steel shoring is performed before the work of connecting the steel shorings. Item 9. The method for assembling the shoring according to Item 8.

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