A construction method for replacing shield tunnel segment support structure with anchor bolt support.

Abstract

This invention discloses a construction method for replacing shield tunnel segment support with anchor bolt support during demolition, comprising the following steps: S1: installing segment lining; S2: moving the top shield tunnel segment; S3: installing anchor bolts corresponding to the positions of the top shield tunnel segment; S4: moving the upper part of the shield tunnel segment and installing the corresponding anchor bolts; S5: demolishing the shield tunnel segment. This invention provides effective support for the surrounding rock of the tunnel during segment demolition, preventing rock damage and ensuring high construction safety. It also allows for the safe demolition of the tunnel segments, enabling reuse and significantly reducing tunnel support costs. Furthermore, the invention features a simple process, requires no specially designed construction equipment, and is easy to promote and apply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe segment safe demolition, in particular to a construction method for changing anchor rod support by demolishing a shield pipe segment support structure. BACKGROUND

[0002] At present, TBM (full-face tunnel boring machine) / shield machine has been used in the safe and rapid tunneling construction of coal mine roadway, and the anchor rod and anchor cable support the surrounding rock of the roadway in the TBM tunneling process. However, the coal mine stratum condition is complex, and the anchor rod and anchor cable support has limited strength in the soft and broken stratum, which is difficult to effectively control the deformation and damage of the surrounding rock in the soft and broken stratum. Although the conventional reinforced concrete pipe segment of the TBM / shield machine tunneling tunnel has high support strength, it has the disadvantages of high cost, high cost, difficult to reuse, etc., and cannot be applied in the TBM tunneling roadway. In the process of coal production, a large number of temporary or semi-permanent roadways (such as gas extraction roadway, water disaster control roadway, and mining area system roadway) need to be excavated and constructed, and the service life and design life are 1-10 years. The anchor rod and anchor cable support is abandoned together with the support materials such as anchor rod and anchor cable installed in the roadway when the roadway is abandoned. Since the cost of anchor rod and anchor cable is low, the economic damage is small after being abandoned. If the pipe segment support is used to support the surrounding rock of the roadway, and the pipe segment is difficult to be removed for reuse after the roadway is abandoned. The main manifestations are as follows: after the pipe segment support structure is installed, the deformation of the surrounding rock contacts the pipe segment, and the surrounding rock pressure is borne by the pipe segment. If the pipe segment is removed, the surrounding rock loses support, and engineering accidents such as roof falling and collapse may occur.

[0003] In view of the above defects, the present application is finally obtained through long-term research and practice. SUMMARY

[0004] The purpose of the present application is to solve the technical problem that the pipe segment support structure is difficult to be removed for reuse after installation, and to provide a construction method for changing anchor rod support by demolishing a shield pipe segment support structure.

[0005] A construction method for changing anchor rod support by demolishing a shield pipe segment support structure, comprising the following steps:

[0006] S1: installing a pipe segment lining

[0007] A plurality of shield pipe segments are formed into pipe segment rings around the circumferential direction, and a plurality of pipe segment rings are assembled into a pipe segment lining along the longitudinal direction;

[0008] S2: moving the top shield pipe segment

[0009] The top shield pipe segment in the upper half of the outermost pipe segment ring and located in the middle is moved a distance outward along the axial direction of the roadway, and the top shield pipe segment and the adjacent pipe segment ring form a certain gap, and then the top shield pipe segment is fixed.

[0010] S3: Anchor bolts are installed at the corresponding locations of the top shield tunnel segments.

[0011] At least one anchor rod is installed in the gap between the top shield segment and the adjacent segment ring. The anchor rod is arranged radially along the corresponding segment ring, with one end connected to the corresponding shield segment and the other end extending into the soil.

[0012] S4: Movement of the upper shield tunnel segments and installation of corresponding anchor bolts

[0013] All the shield tunnel segments in the upper half of the outer segment ring are moved outward a certain distance along the axial direction of the tunnel to align with and fix them with the top shield tunnel segments. At least one anchor bolt is installed radially between the moved shield tunnel segments and the inner segment ring.

[0014] S5: Dismantling of tunnel segments

[0015] First, the upper half of the shield tunnel segments of the outermost segment ring are removed in sequence, and then the lower half of the shield tunnel segments are removed in sequence to complete the removal of the outermost segment ring. This process is repeated from the outside to the inside to complete the removal of all segment rings.

[0016] Furthermore, extension bolts are installed between the top shield segment and the adjacent segment ring, and the top shield segment is fixedly connected to the adjacent segment ring through the extension bolts.

[0017] Furthermore, two anchor bolts are installed in the gap between the top shield segment and the adjacent segment ring, with the two anchor bolts respectively located on both sides of the extension bolt.

[0018] Furthermore, the segment removal sequence adopts a ring-by-ring removal approach. First, the shield tunnel segments in the middle of the upper half of the tunnel cross-section are removed, then the segments are removed sequentially from the middle to both ends, and finally the shield tunnel segments in the lower half of the tunnel cross-section are removed.

[0019] Furthermore, the top shield segment is aligned with and connected to the shield segments on its left and right sides.

[0020] Furthermore, align the front circumferential bolt holes of the top shield segment with the rear circumferential bolt holes of the left and right shield segments, and then use circumferential bolts to fix the top shield segment to the shield segments on both sides.

[0021] Furthermore, the specific content of moving the upper shield tunnel segments in step S4 includes: moving the upper shield tunnel segments in sequence from the middle to both sides along the radial outer side of the segment ring by a certain distance, so that they are aligned with and fixed to the top shield tunnel segment.

[0022] A shield tunnel segment support structure using the construction method described above includes multiple shield tunnel segments, which are arranged in a circumferential direction to form a segment ring, and the multiple segment rings are assembled longitudinally to form a segment lining; each shield tunnel segment is provided with a circumferential connecting hole for connecting adjacent shield tunnel segments on the same segment ring and corresponding shield tunnel segments on adjacent segment rings.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: During the dismantling of tunnel segments, the present invention can provide effective support for the surrounding rock of the tunnel, prevent the surrounding rock from being damaged, and ensure high construction safety; in addition, the tunnel segments can be safely dismantled so that the shield tunnel segments can be reused, which greatly reduces the cost of tunnel support; the present invention has a simple process, does not require specially designed construction equipment, and is easy to promote and apply. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the implementation steps of the construction method of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure for replacing the No. 1 segment with anchor bolt support according to the present invention;

[0026] Figure 3 This is a schematic diagram of the structure for dismantling and replacing the anchor bolt support of segment 1 and segment 2 of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure for dismantling and replacing anchor bolt support with the No. 1, No. 2, and No. 3 segments of the present invention.

[0028] Figure 5 This is a side view of the first segment of the present invention being removed and replaced with anchor bolt support.

[0029] The numbers in the image represent:

[0030] 1-Segment 1; 2-Segment 2; 3-Segment 1; 4-Segment 4; 5-Segment 5; 6-Segment 6; 7-First front circumferential bolt hole; 8-Second rear circumferential bolt hole; 9-Third rear circumferential bolt hole; 10-First circumferential bolt; 11-Second circumferential bolt; 12-First extended bolt; 13-First front segment; 14-First anchor bolt; 15-Second front circumferential bolt hole; 16-Fourth rear circumferential bolt hole; 17-Third circumferential bolt; 18-Fourth circumferential bolt; 19-Second extended bolt; 20-Second front segment; 21-Second anchor bolt; 22-Third front circumferential bolt hole; 23-Fifth rear circumferential bolt hole; 24-Fifth circumferential bolt; 25-Sixth circumferential bolt; 26-Third extended bolt; 27-Third front segment; 28-Third anchor bolt. Detailed Implementation

[0031] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0032] In existing technologies, after the tunnel segment support structure is installed, the surrounding rock deforms and comes into contact with the segments, which bear the pressure of the surrounding rock. However, if the tunnel segments are removed, the surrounding rock will lose its support, potentially leading to engineering accidents such as roof falls and collapses. To address this technical deficiency, this invention provides a construction method for replacing the tunnel segment support structure with anchor bolt support during the removal of the segments for reuse, thereby controlling the deformation and damage of the surrounding rock and preventing engineering accidents such as roof falls and collapses during or after the removal of the segments.

[0033] Example 1

[0034] In this embodiment, a construction method for replacing the shield tunnel segment support structure with anchor bolt support includes the following steps:

[0035] S1: Install segment lining

[0036] Multiple tunnel segments are arranged in a circumferential direction to form a segment ring, and multiple segment rings are assembled longitudinally to form a segment lining.

[0037] S2: Moving the top shield tunnel segment

[0038] The upper half of the outermost segment ring and the top shield segment located in the middle are moved a certain distance outward along the axial direction of the tunnel, so that the top shield segment forms a certain gap with the adjacent segment ring, and then the top shield segment is fixed.

[0039] S3: Anchor bolts are installed at the corresponding locations of the top shield tunnel segments.

[0040] At least one anchor rod is installed in the gap between the top shield segment and the adjacent segment ring. The anchor rod is arranged radially along the corresponding segment ring, with one end connected to the corresponding shield segment and the other end extending into the soil.

[0041] S4: Movement of the upper shield tunnel segments and installation of corresponding anchor bolts

[0042] All the shield tunnel segments in the upper half of the outer segment ring are moved outward a certain distance along the axial direction of the tunnel to align with and fix them with the top shield tunnel segments. At least one anchor bolt is installed radially between the moved shield tunnel segments and the inner segment ring.

[0043] S5: Dismantling of tunnel segments

[0044] The shield tunnel segments in the upper half of the outermost segment ring are removed one by one, followed by the removal of the lower half of the shield tunnel segments in sequence, thus completing the removal of the outermost segment ring. This process is repeated from the outside in to complete the removal of all segment rings.

[0045] Example 2

[0046] In this embodiment, as Figure 1 As shown, a construction method for replacing shield tunnel segment support structure with anchor bolt support includes the following steps:

[0047] S1: Install segment lining

[0048] Six tunnel segments are arranged circumferentially to form a segment ring, and three of these segment rings are assembled longitudinally to form the segment lining. The tunnel cross-section, i.e., the upper and lower parts of the outermost segment ring, is composed of three tunnel segments respectively: segment 1, segment 2, segment 3, segment 4, segment 5, and segment 6. Figure 1 As shown in a.

[0049] Each of the six tunnel segments is equipped with front circumferential bolt holes and rear circumferential bolt holes. The front circumferential bolt holes are located at the end of the tunnel segment closer to the inner ring of the tunnel segment, and the rear circumferential bolt holes are located at the end of the tunnel segment farther from the inner ring of the tunnel segment.

[0050] It is worth noting that, for ease of description, the front and rear circumferential bolt holes of each tunnel segment are named by adding a prefix to their names. For example, the front circumferential bolt hole of segment 1 is named "front circumferential bolt hole 7".

[0051] S2: Moving the top shield tunnel segment

[0052] Move segment 1 outward a certain distance along the axial direction of the roadway, aligning the first front circumferential bolt hole 7 of segment 1 with the second rear circumferential bolt hole 8 of segment 2 and the third rear circumferential bolt hole 9 of segment 3. Install the first circumferential bolt 10 and the second circumferential bolt 11 corresponding to the positions of these bolt holes to fix segment 1. At this time, segment 1 forms a certain gap with the adjacent segment ring. Simultaneously, segment 1 is fixedly connected to the first front segment 13 along the axial direction of the roadway using the first extended bolt 12. Figure 1 As shown in b.

[0053] S3: Anchor bolts are installed at the corresponding locations of the top shield tunnel segments.

[0054] A first anchor bolt 14 is installed in the gap formed between segment 1 and the adjacent segment ring. The first anchor bolt 14 is used to support the surrounding rock located at the top of the roadway, such as... Figure 1 As shown in c;

[0055] S4: Movement of the upper shield tunnel segments and installation of corresponding anchor bolts

[0056] Move segment 2 outward a certain distance along the tunnel axis, aligning the front circumferential bolt hole 15 of segment 2 with the front circumferential bolt hole 7 of segment 1 and the rear circumferential bolt hole 16 of segment 4. Reinstall the third circumferential bolt 17 and the fourth circumferential bolt 18 at the corresponding bolt hole positions to secure segment 2. Simultaneously, use the second extended bolt 19 to secure segment 2 to the second front segment 20 along the tunnel axis. Figure 1 As shown in d.

[0057] A second anchor bolt 21 is installed in the gap formed between segment 2 and the adjacent segment ring. The second anchor bolt 21 is used to support the surrounding rock located on one side of the roadway top, such as... Figure 1 As shown in e;

[0058] Move segment 3 outward a certain distance along the tunnel axis, aligning the front circumferential bolt hole 22 of segment 3 with the front circumferential bolt hole 7 of segment 1 and the rear circumferential bolt hole 23 of segment 5. Reinstall the fifth circumferential bolt 24 and the sixth circumferential bolt 25 at the corresponding bolt hole positions to secure segment 3. Simultaneously, use the third extended bolt 26 to secure segment 3 to the third front segment 27 along the tunnel axis. Figure 1 As shown in f.

[0059] A third anchor bolt 28 is installed in the gap formed between segment 3 and the adjacent segment ring. The third anchor bolt 28 is used to support the surrounding rock on the other side of the roadway top, such as... Figure 1 As shown in g;

[0060] S5: Dismantling of tunnel segments

[0061] After completing the support of the upper half of the tunnel cross-section, the surrounding rock at the top of the tunnel has been effectively controlled. At this point, segment 1, segment 2, and segment 3 can be removed. Figure 1 As shown in h. It is worth noting that the pre-replaced tunnel segments can still provide support during the installation of anchor bolts.

[0062] Furthermore, different anchor bolt support methods can be adopted for different surrounding rock conditions.

[0063] Even without segmental support, the lower half of the roadway's surrounding rock will not experience roof collapse if it fractures. Therefore, given that the upper part of the roadway is already supported by anchor bolts, segments 4, 5, and 6 in the lower part of the roadway can be removed. Figure 1 As shown in i, the removal of one ring of tunnel segments and the conversion of the support mode are now complete.

[0064] Specifically, the tunnel segments are dismantled in a ring-by-ring manner. First, the middle shield tunnel segments in the upper half of the tunnel cross-section are dismantled, then the segments are dismantled sequentially from the middle to both ends, and finally the shield tunnel segments in the lower half of the tunnel cross-section are dismantled.

[0065] After the tunnel is constructed using segment support, the process proceeds from the outside in, following the sequence of first removing the top segments and installing anchor bolts to provide top support, then removing the lower segments. This completes the removal of one segment ring and the installation of anchor bolts. That is, after removing one segment ring, anchor bolts are installed to replace the segments for tunnel support. This completes the removal of one segment ring. The above process is repeated until all segments in the tunnel are removed, from the outside in.

[0066] This invention discloses a construction method for replacing shield tunnel segment support with anchor bolt support during the removal of the segments. This method provides effective support for the surrounding rock of the tunnel during the removal of the segments, preventing rock damage and ensuring high construction safety. In addition, the segments can be safely removed so that the shield tunnel segments can be reused, significantly reducing the cost of tunnel support. The construction method is simple, requires no specially designed construction equipment, and is easy to promote and apply.

[0067] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A construction method for dismantling a shield segmental lining structure and replacing it with a rock bolting support, characterized by, The method comprises the following steps: S1: installing a pipe lining A plurality of shield segments are formed into a segment ring in a circumferential direction, and a plurality of segment rings are assembled into a pipe lining in a longitudinal direction; S2: moving a top shield segment A top shield segment in the upper half of the outermost segment ring and located in the middle is moved a distance outward along the axial direction of the tunnel, so that the top shield segment forms a gap with the inner segment ring, and then the top shield segment is fixed; S3: installing an anchor rod corresponding to the position of the top shield segment At least one anchor rod is installed in the gap between the top shield segment and the inner segment ring, and the anchor rod is arranged radially along the corresponding segment ring; S4: moving the upper half shield segment and installing the corresponding anchor rod All shield segments in the upper half of the outer segment ring are moved a distance outward along the axial direction of the tunnel, so that they are aligned with the top shield segment and fixed, and at least one anchor rod is installed radially between the moved shield segment and the inner segment ring; S5: removing the shield segment The shield segments in the upper half of the outer segment ring are removed in sequence, and then the shield segments in the lower half are removed in sequence, completing the removal of the outermost segment ring, and the removal of all segment rings is completed in sequence from the outside to the inside.

2. The construction method of claim 1, wherein, A lengthened bolt is installed between the top shield segment and the inner segment ring, and the top shield segment is fixedly connected to the inner segment ring through the lengthened bolt.

3. The construction method of claim 2, wherein the shield segment support structure is removed and replaced with the anchor support structure. Two anchor rods are installed in the gap between the top shield segment and the inner segment ring, and the two anchor rods are arranged on both sides of the lengthened bolt.

4. The construction method of claim 1, wherein, The segment removal sequence is ring by ring, the shield segments in the upper half of the tunnel cross section are removed first, then the shield segments are removed in sequence from the middle to the ends, and finally the shield segments in the lower half of the tunnel cross section are removed.

5. The construction method of claim 1, wherein, The top shield segment is aligned with and connected to the shield segments on its left and right sides.

6. The construction method of claim 5, wherein, The front circumferential bolt hole of the top shield segment is aligned with the rear circumferential bolt hole of the shield segments on its left and right sides, and then circumferential bolts are used to fixedly connect the top shield segment to the shield segments on its left and right sides.

Images