CN105822323B - Octagon and the tunnel pipe sheet built structure of quadrangle section of jurisdiction ring alternating assembly - Google Patents

Abstract

The invention discloses a tunnel segment lining structure in which octagonal and quadrilateral segments are assembled alternately in the circumferential direction, comprising quadrangle segment and octagonal segment, the two sides of the octagonal segment are two long sides, eight The edges of the two ends of the polygonal segment respectively form a baseless isosceles trapezoid, and the two side faces on both sides of each octagonal segment are respectively used to connect with the long end faces on both sides of the adjacent quadrangle segment, each The four oblique end faces at both ends of the octagonal segment are respectively used to connect with the oblique end faces at the two ends of another octagonal segment, and the positive end faces at both ends of each octagonal segment are respectively used to connect with the two adjacent quadrilateral segments. The short end face connection of the end. The invention adopts the segment lining structure combining octagonal segment and quadrangle segment of specific shape, which can realize the purpose of shield tunneling and rapid segment assembly at the same time, significantly improving the construction efficiency, and the assembled tunnel segments The overall rigidity of the lining is significantly enhanced, and fewer types of templates are required for segment prefabrication.

Description

Tunnel segment lining structure with octagonal and quadrilateral segments assembled alternately in circumferential direction

technical field

The invention relates to a tunnel segment lining structure, in particular to a tunnel segment lining structure in which octagonal and quadrilateral segments are assembled alternately in the circumferential direction.

Background technique

The shield method relies on the shield tail jack to push on the assembled prefabricated segment ring, and the cutter head in front of the shield rotates to cut the soil to achieve advancement, and at the same time, a new ring of prefabricated segment assembly is implemented under the protection of the shield shell And finally form a mechanized construction method of shield tunnel structure. Because the shield method has the advantages of high degree of mechanization and small ground disturbance, it has become the main method for the construction of underground projects such as urban subway tunnels and cross-river and sea tunnels.

At present, the domestic shield construction mainly adopts the quadrilateral segment lining structure. Each segment lining ring is assembled from quadrilateral segment segments with the same width through the circumferential bolt holes with circumferential bolts, and longitudinal bolts are used between the rings. The connections eventually form a continuous tunnel structure. The joint surface between the segment ring and the ring assembled by quadrilateral segments with the same width is usually a plane, because the segment cannot provide reaction force for the jacking jack during the assembling process, so this quadrangle The segment lining structure requires that the segment cannot be assembled during the tunneling construction of the shield, and the excavation construction cannot be performed when the segment is assembled, that is, the excavation and assembly cannot be carried out at the same time, which seriously restricts the efficiency of the shield construction. At the same time, although the existing quadrilateral segment lining structure can realize staggered seam assembly in the longitudinal direction to prevent the penetration of the longitudinal seam, it cannot change the connectivity of the interannulus seam between the rings, which is not conducive to improving the overall quality of the tunnel. Rigidity, the structural deformation is large in the soft soil layer, and the overall stability is not high. Since most of the existing quadrilateral segments are connected by bolts through hand holes, it is difficult to meet the high efficiency requirements of continuous synchronous propulsion and assembly. In addition, the existing set of molds for quadrilateral segment lining on the straight line section mainly includes four types of templates, including a capping block, two adjacent blocks and a standard block. There are many types of templates, and the cost of purchasing molds is relatively high. , When the segments are assembled, the various segment types need to be numbered to prevent confusion during transportation and assembly.

Therefore, it is necessary to design a new type of shield tunnel segment lining structure that can be used for synchronous propulsion and assembly, the overall stiffness is significantly enhanced, it can be quickly assembled, and the template types required for segment prefabrication are less. The structure can be used in large-scale tunnel projects that are sensitive to ground deformation such as soft soil and have a large structural cross-sectional area.

Contents of the invention

The object of the present invention is to provide a tunnel segment lining structure in which octagonal and quadrilateral segments are assembled alternately in the circumferential direction in order to solve the above problems. This tunnel segment lining structure can realize synchronous advancement and assembly, and the overall rigidity is significantly enhanced. , It can be quickly assembled and there are fewer template types required for segment prefabrication.

The present invention achieves the above object through the following technical solutions:

A tunnel segment lining structure in which octagonal and quadrilateral segments are assembled alternately in the circumferential direction, including quadrilateral segment and octagonal segment, the two sides of the octagonal segment are two long sides, so The edges of the two ends of the octagonal segment respectively form a bottomless isosceles trapezoid, and the two long sides of the octagonal segment and the six sides of the two bottomless isosceles trapezoids together form the described The eight sides of the octagonal segment, the two sides on both sides of each octagonal segment are respectively used to connect with the long end faces on both sides of the adjacent quadrangle segment, and each of the eight sides The four oblique end faces at both ends of the octagonal segment are respectively used to connect with the oblique end faces at the other two ends of the octagonal segment, and the positive end faces at both ends of each octagonal segment are respectively used to connect with the adjacent said octagonal segments. The short end faces of the two ends of the quadrilateral segments are connected.

In the above structure, the four oblique end faces of one octagonal segment respectively contact and connect with the oblique end faces at both ends of the other octagonal segment to form a occlusal relationship, and accommodating The gap of the quadrangular segment, the annular tunnel segment lining composed of multiple octagonal segments and multiple quadrangular segments has sufficient support rigidity, and because the side of the octagonal segment on the annular end face is higher than The long end face of the quadrangular segment can realize the alternating assembly of the octagonal segment and the quadrangle segment in the circumferential direction.

Preferably, pin holes are respectively provided on one side of the octagonal segment and one long end surface of the quadrangular segment, and the other side of the octagonal segment is connected to the quadrangle segment. The other long end surface of the sheet is respectively provided with latches matched with the pin holes. This structure can be assembled vertically conveniently and reduces the number of hand holes in segments.

As a preference, a pin-hole prefabricated joint steel component is installed in the pin hole, and the pin hole prefabricated joint steel component is connected with a steel bar placed in the segment body, and the two sides of the pin hole prefabricated joint steel component are respectively provided with A blind hole, a resilient pin is installed in the blind hole, a spring is connected between the resilient pin and the inner bottom surface of the blind hole, and the two resilient pins are respectively located in the center of the pin hole On both sides of the axis; the inner end of the pin is connected to the prefabricated joint steel member placed in the segment body, the prefabricated joint steel component of the pin is connected to the steel bar placed in the body of the segment, the front section of the pin A ring groove is provided near the front end, and the front end of the bolt is tapered. The pin-hole structure and the pin-hole structure can realize tight fitting and fast locking between the pin and the pin-hole.

In order to achieve optimal support stiffness, the base angle of the bottomless isosceles trapezoid is 45°.

In order to facilitate fast and stable installation, the quadrilateral segment is composed of a first half segment and a second half segment, one end face of the first half segment is a first slope, and the end face of the second half segment is One end face is a second slope, the first slope of the first half segment fits with the second slope of the second half segment, the other end face of the first half segment is in contact with the second half segment The other end faces of the segment are the short end faces of the two ends of the quadrangular segment respectively, and the end face of one side of the first half segment and the end face of the same side of the second half segment constitute one side of the quadrangle segment together. As for the side surface, the other end surface of the first half-segment and the same-side end surface of the second half-segment form the other side of the quadrilateral segment.

Explanation: The quadrilateral and octagon referred to by the above quadrilateral segment and octagonal segment actually mean that the segment edge is projected on the same plane to form a quadrangle and octagon, because the segment is arc-shaped, and the segment itself The edges cannot be connected to quadrilaterals and octagons, but for the convenience of expression, they are directly referred to as quadrilateral segments and octagonal segments in this industry and in the present invention; similarly, the above-mentioned isosceles trapezoid without base is also octagonal. The meaning of the isosceles trapezoid without base is formed after the three edges of one of the ends of the shaped segment are projected on the same plane; in addition, the above-mentioned quadrilateral segment is a traditional segment, and the quadrilateral referred to is a rectangle, which is also a rectangle in the present invention. Because it is the same shape as the traditional quadrilateral segment, it is not limited to a rectangle.

The beneficial effects of the present invention are:

The invention adopts a segment lining structure combining octagonal segment and quadrangle segment of specific shape, which can realize the purpose of shield tunneling and rapid segment assembly at the same time, significantly improving the construction efficiency, and the assembled tunnel tube The overall rigidity of the segment lining is significantly enhanced, and fewer template types are required for segment prefabrication, which solves the problem that the shield tunneling method, especially in the construction of large-section tunnels in soft ground, cannot be synchronously operated during excavation and assembly, and the overall rigidity of the structure is relatively weak. Segments cannot be assembled quickly and there are too many segment templates and the segments are not easy to identify. It is especially suitable for large-scale tunnel projects that are sensitive to ground deformation such as soft soil and have a large structural cross-sectional area. The specific advantages are as follows:

1. Compared with the prior art, the present invention is composed of octagonal segments and quadrilateral segments with different widths (that is, the width between the edges on both sides) and alternately assembled in the circumferential direction. The end face of the lining ring caused by different widths The platform gap continuously provides the jack reaction surface, realizes the synchronous operation of excavation and assembly, solves the problem that the shield cannot be continuously advanced caused by the existing quadrilateral segments of equal width and width, and the construction efficiency is higher;

2. Since the four oblique end faces of the octagonal segments engage with the oblique end faces of the other four adjacent octagonal segments along the tunnel ring direction, the penetration of the longitudinal seam of the shield tunnel is avoided without staggered assembly At the same time, due to the different widths of the octagonal segment and the quadrangle segment, the penetration of the annular seam is also avoided. This type of joint can greatly improve the overall stiffness of the lining structure, and strengthen the structure in deformation-sensitive formations. stability in

3. The vertical bolt and pin hole connection type is adopted between the longitudinal segments of the tunnel, and there is no need to set the longitudinal bolt connection hand hole, which reduces the number of hand holes, and the bolt connection is faster than the artificial hand hole bolt connection, which can realize rapid assembly ;

4. A set of prefabricated segment molds only needs two templates, which are the first half segment or the second half segment of the octagonal segment and the quadrangle segment (the first half segment and the second half segment The shape and size of the segment are the same), and the first half segment or the second half segment of the quadrilateral segment can be prefabricated by installing longitudinal pins on the long side and the short side respectively to meet the assembly needs. Reduce the cost of mold procurement, since there are only two templates, it is convenient for the organization, production and identification of segments;

5. Compared with the assembly of the existing quadrangular segment lining ring, the propulsion stroke of the shield jack in the present invention is about 3/4 of the width of the octagonal segment, which is higher than the required jack for the quadrilateral segment of the same width. The stroke is small, and the requirements for the stroke parameters of the jack are relatively low.

Description of drawings

Fig. 1 is a three-dimensional view of a tunnel segment lining structure in which octagonal and quadrilateral segments are assembled alternately in the annular direction according to the present invention after being assembled into a ring;

Fig. 2 is a plan view after the unfolded tunnel segment lining structure in which the octagonal and quadrilateral segments of the present invention are alternately assembled circumferentially in Fig. 1;

Fig. 3 is a perspective view of the octagonal segment of the present invention;

Fig. 4 is a perspective view of the quadrilateral segment of the present invention;

Fig. 5-1 is one of the cross-sectional structural schematic diagrams of the pin and the pin hole of the present invention, the pin and the pin hole in the figure are not connected;

Fig. 5-2 is the second schematic cross-sectional structure diagram of the plug and pin hole of the present invention, the plug and pin hole in the figure have been connected;

Fig. 6-1 is one of the plan views of the tunnel segment lining structure in which the octagonal and quadrilateral segments are assembled alternately in the circumferential direction during the continuous assembly process;

Fig. 6-2 is the second plan view of the tunnel segment lining structure in which the octagonal and quadrilateral segments are assembled alternately in the circumferential direction during the continuous assembly process;

Fig. 6-3 is the third plan view of the tunnel segment lining structure in which the octagonal and quadrilateral segments are assembled alternately in the circumferential direction after being unfolded during the continuous assembly process;

Fig. 6-4 is the fourth plan view of the tunnel segment lining structure in which the octagonal and quadrilateral segment segments are assembled alternately in the circumferential direction after being unfolded during the continuous assembly process;

Fig. 6-5 is the fifth plan view of the tunnel segment lining structure in which the octagonal and quadrilateral segment segments are assembled alternately in the circumferential direction after being unfolded during the continuous assembly process;

Fig. 6-6 is the sixth plan view of the tunnel segment lining structure in which the octagonal and quadrilateral segments are assembled alternately in the circumferential direction after being unfolded during the continuous assembly process of the present invention.

detailed description

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figures 1 to 4, the tunnel segment lining structure in which octagonal and quadrilateral segments are alternately assembled circumferentially according to the present invention includes quadrilateral segment and octagonal segment 1, and the quadrilateral segment consists of the first One half segment 2 and the second half segment 3 are formed, one end face of the first half segment 2 is a first slope, one end face of the second half segment 3 is a second slope, and the first half segment 2 is a second slope. A slope fits with the second slope of the second half-segment 3, and the other end face of the first half-segment 2 and the other end face of the second half-segment 3 are respectively the short end faces at both ends of the quadrangular segment, and the second One side end face of the half segment 2 and the same side end face of the second half segment 3 together form one side of the quadrilateral segment, the other side end face of the first half segment 2 and the second half segment 3 The end faces on the same side together form the other side of the quadrilateral segment; the two sides of the octagonal segment 1 are two long sides, and the edges of the two ends of the octagonal segment 1 respectively form a bottomless isosceles Trapezoidal, the bottom angle of the isosceles trapezoid without base is 45°, the two long sides of the octagonal segment 1, and the six sides of the two isosceles trapezoids without base jointly form the octagonal segment 1, the two sides on both sides of each octagonal segment 1 are respectively used to connect with the long end faces on both sides of the adjacent quadrangular segment, and the four sides at both ends of each octagonal segment 1 The two oblique end faces are respectively used to connect with the oblique end faces at the two ends of the other four octagonal segments 1, and the positive end faces at both ends of each octagonal segment 1 are respectively used for connecting with the short end faces at the two ends of the adjacent quadrangle segments. Connection; wherein one side of the octagonal segment 1 and one side of the long end faces of the first half segment 2 and the second half segment 3 of the quadrangle segment are respectively provided with pin holes 5, and the eight sides The other side of the square segment and the other side long end face of the first half segment 2 and the second half segment 3 of the quadrilateral segment are respectively provided with a latch 7 matching with the pin hole 5, and the octagonal segment There are two pin holes 5 and pins 7 on the sheet 1, corresponding to the pin holes 5 and pins 7 of the first half segment 2 and the second half segment 3 of a quadrangular segment.

Fig. 3 and Fig. 4 also show the hand hole 4 and the annular bolt hole 6 on the first half-segment 2 (the second half-segment 3) on the octagonal segment 1 and the quadrangular segment, This is a conventional structure and will not be described in detail.

For ease of understanding, Fig. 1 also shows the tunnel ring direction H, the tunnel longitudinal direction Z, and the step D, where the step D is the distance between the side of the octagonal segment higher than the long end face of the quadrangular segment; Fig. 2 also shows The advancing direction S of the shield machine is shown; Fig. 3 also shows the segment width L of the octagonal segment 1, which is larger than the width of the quadrilateral segment.

As shown in Figure 5-1 and Figure 5-2, the pin hole prefabricated joint steel component 8 is installed in the pin hole 5, and the pin hole prefabricated joint steel component 8 is placed on the segment (including octagonal segment 1 and quadrilateral tube sheet) steel bars (not marked) in the main body are connected, and the two sides of the pin-hole prefabricated joint steel member 8 are respectively provided with blind holes, and a resilient pin 9 is installed in the blind hole, and the resilient pin 9 is connected to the A spring 10 is connected between the inner bottom surfaces of the blind holes, and two resilient pins 9 are respectively located on both sides of the central axis of the pin hole 5; The bolt prefabricated joint steel member 22 in the quadrilateral segment) body is connected, and the bolt prefabricated joint steel member 22 is connected with the steel bar 11 placed in the segment body, and the front section of the bolt 7 is provided with a ring groove near the front end, and the front section of the bolt 7 is provided with a ring groove. The front end is tapered. In order to achieve a better leak-proof effect, a groove 12 is provided on the side surface of the segment close to the outer surface 14 of the segment, and a waterproof rubber strip 17 is installed in the groove 12 . The outer surface 14 of the segment and the inner surface 13 of the segment in the figure are determined by the internal and external relationship after the segment is assembled into a ring; Fig. 5-1 also shows the unassembled prefabricated segment 15 and the assembled prefabricated segment 16. The segments 15 and 16 here can be octagonal segment 1 or quadrilateral segment; Fig. 5-1 also shows the advancing direction S of the shield machine.

As shown in Figure 6-1 to Figure 6-6, the working principle of tunnel construction using the tunnel segment lining structure with octagonal and quadrilateral segments assembled alternately in the circumferential direction of the present invention is as follows:

When carrying out synchronous excavation and assembly operations of the shield machine on the basis of the lining structure with several ring segments assembled, as shown in Figure 6-1, first push the support of the jack (that is, the jack in the jacking state) 20 Standing on the first set of reaction force acting surfaces 18 of the lining structure, the first set of reaction force acting surfaces 18 are the outer surfaces of a group of octagonal segments 1 that are circumferentially spaced and have the same height on the sides, and the rest The jack is retracted to form a retracting jack (that is, the jack in the retracted state) 21, because there is a stage difference between the protruding octagonal segment 1 and the first half segment 2 and the second half segment 3 of the quadrangular segment , so when the shield machine advances about 3/4 of the width of the octagonal segment 1, the octagonal segment 1 is assembled in the region corresponding to the retraction jack 21. When assembling, referring to Figure 5-1 and Figure 5-2, as the pin 7 is pushed in, the spring 10 is compressed by the spring 10 being compressed by the spring 10 in the pin hole 5, and the rebound pin 9 is retracted, and the push is continued When the resilient pin 9 is facing the position of the ring groove of the latch 7, it pops out and snaps into the ring groove under the action of the spring 10 to complete the fastening of the joint. After the assembly is completed, as shown in Figure 6-2, the jack that was originally in the retracted state stretches out to become the push jack 20, and the jack that has been pushed is retracted to become the retract jack 21, that is, the push jack 20 and the retract jack 21 Reverse each other, the support of the push jack 20 is pushed against the second set of reaction force acting surfaces 19 of the lining structure, and the second set of reaction force acting surfaces 19 is another set of multiple eighth cylinders with alternating sides in the circumferential direction and the same height. The outer side of the polygonal segment 1, and then the first half segment 2 and the second half segment 3 of the quadrilateral segment are assembled in a similar manner, and the first half segment 2 is first assembled along the shield advancing direction during assembly. , the oblique end face of the first half pipe 2 makes the length of the pipe a narrow structure inside and wide outside, and then joins the second half pipe 3, and the oblique end face of the second half pipe 3 makes the length of the pipe be narrow inside and outside Wide structure, as shown in Figure 6-3 after assembly; continue to advance after assembling the quadrilateral segment, when advancing about 3/4 of the width of the octagonal segment 1, press again as shown in Figure 6-1 The octagonal segments 1 are assembled in the corresponding manner, as shown in Figure 6-4 after assembly. After the assembly is completed; the pushing jack 20 and the retracting jack 21 are exchanged again, and the above-mentioned process of assembling the quadrilateral segment and the octagonal segment is repeated. After assembling the quadrilateral segment, as shown in Figure 6-5, the octagon After the segment is formed, it is shown in Figure 6-6; such a cycle can ensure the uninterrupted construction of the tunnel.

The above-described embodiments are only preferred embodiments of the present invention, and are not limitations to the technical solutions of the present invention. As long as they are technical solutions that can be realized on the basis of the above-mentioned embodiments without creative work, they should be regarded as falling into the scope of the patent of the present invention. within the scope of protection of rights.

Claims (3)

1. A tunnel segment lining structure in which octagonal and quadrangular segments are assembled alternately in the circumferential direction, comprising quadrangular segments, characterized in that: it also includes octagonal segments, and the two sides of the octagonal segments are The two long sides, the edges of the two ends of the octagonal segment respectively form a bottomless isosceles trapezoid, the two long sides of the octagonal segment, the six sides of the two bottomless isosceles trapezoids The two sides together constitute the eight sides of the octagonal segment, and the two side faces on both sides of each octagonal segment are respectively used to connect with the long end surfaces on both sides of the adjacent quadrangle segment, The four oblique end faces at both ends of each octagonal segment are respectively used to connect with the oblique end faces at both ends of the other octagonal segment, and the positive end faces at both ends of each octagonal segment are respectively used for It is connected with the short end faces at both ends of the adjacent quadrangular segment; one side of the octagonal segment and one side of the long end face of the quadrangle segment are respectively provided with pin holes, and the octagonal The other side of the segment and the other long end surface of the quadrilateral segment are provided with pins matched with the pin hole respectively; the pin hole prefabricated joint steel member is installed in the pin hole, and the pin hole is prefabricated The joint steel member is connected with the steel bar placed in the segment body, the two sides of the prefabricated joint steel member with pin holes are respectively provided with blind holes, and the resilient pins are installed in the blind holes, and the resilient pins are connected with the A spring is connected between the inner bottom of the blind hole, and the two resilient pins are respectively located on both sides of the central axis of the pin hole; the inner end of the pin is connected to the prefabricated joint of the pin in the segment The steel member is connected, the bolt prefabricated joint steel member is connected with the steel bar placed in the segment body, the front section of the bolt is provided with a ring groove near the front end, and the front end of the bolt is tapered. 2. The tunnel segment lining structure in which octagonal and quadrilateral segments are assembled alternately in circumferential direction according to claim 1, characterized in that: the base angle of the isosceles trapezoid without base is 45°. 3. The tunnel segment lining structure in which octagonal and quadrilateral segments are alternately assembled circumferentially according to claim 1, wherein the quadrilateral segment is composed of a first half segment and a second half segment, One end face of the first half-segment is a first slope, one end face of the second half-segment is a second slope, and the first slope of the first half-segment and the first slope of the second half-segment The second slope fits with each other, the other end face of the first half segment and the other end face of the second half segment are the short end faces of the two ends of the quadrangular segment respectively, one of the first half segments The side end surface and the same-side end surface of the second half-segment together constitute one side of the quadrangular segment, and the other-side end surface of the first half-segment and the same-side end surface of the second half-segment Together they form the other side of the quadrilateral segment.