V-shaped combination device suitable for tunnel construction joints and construction method

Abstract

The invention relates to the technical field of tunnel construction, in particular to a V-shaped combination device suitable for tunnel construction joints and a construction method. Comprising a soft sealing strip and a hard sealing strip, the soft sealing strip and the hard sealing strip are installed on a secondary lining trolley, the secondary lining trolley comprises a lining template and a secondary lining blocking head mold, the lining template and the secondary lining blocking head mold form a right angle, the soft sealing strip is arranged at the left end of the lining template, and the hard sealing strip is arranged at the right end of the lining template. The hard sealing strip is arranged on the second lining stopper die and is positioned in the right angle; the soft sealing strip comprises an isosceles triangle body and a rubber buffer strip, the isosceles triangle body and the rubber buffer strip are integrally formed, and the rubber buffer strip is located at the extending position of the bottom face of the isosceles triangle body. The hard sealing strip is a right triangle body, the section of the hard sealing strip is a right triangle, and the right triangle coincides with half of the section of the isosceles triangle body. A smooth and regular construction joint is formed between two adjacent linings through the soft sealing strip and the hard sealing strip, manual secondary chiseling is not needed, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, in particular to a V-shaped combination device suitable for tunnel construction joints and a construction method. Background Art

[0002] During the tunnel construction process, the arc-shaped part is the lining, which is divided into primary lining and secondary lining. The primary lining is close to the mountain as the foundation of the secondary lining. The secondary lining is formed by pouring concrete on the basis of the primary lining using a secondary lining trolley. The secondary lining trolley includes a secondary lining stopper mold and a lining template. The pouring of the secondary lining is carried out one by one. The first version of the secondary lining is poured first, and the second version of the secondary lining is poured when the strength of the first version of the secondary lining reaches the requirement. The end of the second version of the secondary lining close to the previous version is the left end, and the other end is the right end. When each version of the secondary lining is poured, the intersection of the second lining stopper mold and the lining template is a 90° right angle. Since the secondary lining concrete grading adopts three gradings: 5 -10mm, 10-20mm, 16-31.5mm. This will cause coarse aggregates to be present in the concrete near the right angle during pouring. The coarse aggregates will be placed on the two right angles of the right angle. There will be gaps in the corners that are not filled with concrete. There will be gaps between the coarse aggregates and the 90° right angle. A construction joint will be formed between the two sections of the secondary lining due to the gaps. The coarse aggregates exposed outside this construction joint will be very high. After the tunnel is opened to traffic, the risk of coarse aggregates falling is extremely high. The sharp edges of the coarse aggregates need to be polished and rounded. When the second lining trolley pours the next version of the secondary lining, it is necessary to lift and fit closely at the right end of the poured section. If the operation is improper, the sharp edges are easily damaged, resulting in local block drop. Therefore, it is necessary to manually chisel out the coarse aggregates in the construction joints during tunnel construction. The surface of the construction joint after the coarse aggregates are manually chiseled out is not smooth, and it is time-consuming and labor-intensive, which has a great impact on the construction period of the secondary lining. Summary of the invention

[0003] The problem to be solved is to provide a solution so that the tunnel has a smooth construction joint when the secondary lining pouring is completed, instead of manual secondary chiseling.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a V-shaped combination device suitable for tunnel construction joints, comprising a soft sealing strip and a hard sealing strip, the soft sealing strip and the hard sealing strip are respectively installed on a second lining trolley, the second lining trolley comprises a lining template and a second lining stop head mold, the lining template and the second lining stop head mold form a right angle, the soft sealing strip is arranged at the left end of the lining template, and the hard sealing strip is arranged on the second lining stop head mold and is within the right angle; the soft sealing strip comprises an isosceles triangle main body and a rubber buffer belt, the isosceles triangle main body and the rubber buffer belt are integrally formed, and the rubber buffer belt is located at the extension of the bottom surface of the isosceles triangle main body; the hard sealing strip is a right triangle, and the cross-section of the hard sealing strip is a right triangle, and the right triangle coincides with half of the cross-section of the isosceles triangle main body.

[0005] Preferably, the soft sealing strip is made of rubber, the hard sealing strip is made of stainless steel, and the hard sealing strip is welded to the second lining stopper mold.

[0006] Preferably, the rubber buffer strip has a thickness of 3 mm to 5 mm.

[0007] Preferably, the vertex angle of the isosceles triangle main body cross section is 90°, and the acute angle of the cross section of the hard sealing strip is 45°.

[0008] Preferably, both the soft sealing strip and the hard sealing strip are in the shape of a major arc, and the curvature and arc length of the major arc are consistent with the curvature and arc length of the secondary lining.

[0009] Compared with the prior art, the present invention provides a V-shaped combination device and construction method suitable for tunnel construction joints, which has the following beneficial effects:

[0010] 1. A hard sealing strip is placed at the 90° angle between the second lining end formwork and the lining formwork. When pouring, a chamfer will be formed and no aggregate will fill the gap here, thus avoiding the accumulation of coarse aggregate to produce sharp edges. After removal, a natural triangular area will be formed.

[0011] 2. When the second lining trolley is pouring the next lining, the contact area between the soft sealing strip and the previous lining will be supported obliquely by the soft sealing strip to avoid falling off and cracking.

[0012] 3. The combination of soft sealing strips and hard sealing strips forms a smooth and regular construction joint between two adjacent linings, eliminating the need for manual secondary chiseling and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the device of the present invention before use;

[0014] Figure 2 This is a schematic diagram of the device of the present invention when in use;

[0015] Figure 3 This is a structural diagram of the soft sealing strip of the present invention;

[0016] Figure 4 This is a structural diagram of the hard sealing strip of the present invention;

[0017] Figure 5 It is a cross-sectional schematic diagram of the present invention;

[0018] Explanation of the reference numerals: 1. soft sealing strip; 11. isosceles triangle body; 12. rubber buffer strip; 2. hard sealing strip; 3. secondary lining trolley; 31. lining template; 32. secondary lining stopper template; 33. right angle; 4. cast lining; 5. lining to be cast; 6. construction joint. DETAILED DESCRIPTION

[0019] The technical solution in the embodiment of the present invention will be described below in conjunction with the accompanying drawings in the embodiment of the present invention:

[0020] As described in the background technology, the present invention provides a V-shaped combined device and construction method suitable for tunnel construction joints, which are used in the secondary lining casting process. As shown in the figure, the soft sealing strip 1 and the hard sealing strip 2 are respectively installed on the second lining trolley 3. The second lining trolley 3 includes a lining template 31 and a second lining stopper mold 32. The lining template 31 and the second lining stopper mold 32 form a right angle 33. The soft sealing strip 1 is arranged at the left end of the lining template 31, and the hard sealing strip 2 is arranged on the second lining stopper mold 32 and is in the right angle 33; the soft sealing strip 1 is arranged at the left end of the lining template 31, and the hard sealing strip 2 is arranged on the second lining stopper mold 32 and is in the right angle 33; The seal 1 includes an isosceles triangle main body 11 and a rubber buffer strip 12, which are integrally formed. The rubber buffer strip 12 is located at the extension of the bottom surface of the isosceles triangle main body 11; the hard sealing strip 2 is a right triangle, and the cross-section of the hard sealing strip 2 is a right triangle, which overlaps with half of the cross-section of the isosceles triangle main body 11, so that the gap formed by the hard sealing strip 2 after casting can fit half of the isosceles triangle main body 11, and the other half of the isosceles triangle main body 11 forms the chamfer of the left end of the lining 5 to be cast. The material of the soft sealing strip 1 is generally rubber, which has the function of sealing and preventing leakage. The material of the hard sealing strip 2 is stainless steel. The thickness of the rubber buffer strip 12 is 3mm-5mm. The rubber buffer strip 12 prevents the lining template 31 from squeezing the right end of the poured lining 4 on the one hand, and prevents the isosceles triangle body 11 from being pushed and dislocated under the squeezing of the lining template 31 on the other hand. The thickness of the rubber buffer strip 12 does not affect the formation of the final construction joint 6, and is within the allowable error range of the construction joint 6; the stainless steel hard sealing strip 2 is welded to the secondary lining stopper mold 32. Both the soft sealing strip 1 and the hard sealing strip 2 are in the shape of an optimal arc, and the arc and arc length of the optimal arc are consistent with the arc and arc length of the secondary lining.

[0021] When in use, when pouring the first lining, the second lining trolley 3 is placed in place, the second lining stopper mold 32 is rotatably connected relative to the lining template 31, and the second lining stopper mold 32 welded with the hard sealing strip 2 is rotated into place, and the longitudinal part of the second lining stopper mold 32 is perpendicular to the transverse part of the lining template 31. At this time, the hard sealing strip 2 is located in the right angle 33. When pouring the first lining, the inclined surface of the hard sealing strip 2 forms a supporting surface, and there will be no concrete in the area occupied by the hard sealing strip 2, and finally a half construction joint is formed. After the concrete of the first lining reaches the hardness requirement, the pouring of the second lining begins; Figure 2As shown, after the hardness of the first lining reaches the standard, it can be regarded as the cast lining 4, and the right end of the cast lining 4 is the lining 5 to be cast. At this time, the soft sealing strip 1 is installed on the left end of the lining template 31 and fits with the right end of the cast lining 4, wherein half of the isosceles triangle body 11 is stuck in half of the construction joint, and the rubber buffer belt 12 is between the lining template 31 and the cast lining 4. The second lining stopper mold 32 welded with the hard sealing strip 2 is rotated to the right end face position of the lining 5 to be cast, and the casting operation is carried out. After the concrete strength reaches the standard, a construction joint 6 is formed between the cast lining 4 and the lining 5 to be cast, and half of the construction joint 6 is formed at the right end of the lining 5 to be cast, the soft sealing strip 1 is removed, and the second lining trolley 3 is moved to the next lining area.

[0022] like Figure 5 As shown, it is a schematic diagram of the cross section of the soft sealing strip 1 and the hard sealing strip 2. The cross section of the isosceles triangle main body 11 is an isosceles triangle, the vertex angle of the isosceles triangle is α, and the symmetry axis of the isosceles triangle divides it into two congruent parts S1 and S2. The cross section of the hard sealing strip 2 is a right triangle S3, the acute angle of the right triangle β=0.5α, the hypotenuse length of the right triangle is equal to the waist length of the isosceles triangle, and the right triangle S3 is congruent to the S1 part. Generally, α=90° and β=45° are selected for construction. In this case, a construction joint 6 with a chamfer of 90° is finally formed between two adjacent linings.

[0023] The construction method of the V-shaped combined device for tunnel construction joints of the present invention comprises the following steps:

[0024] 1. When pouring the first section of lining, the hard sealing strip 2 is installed around the second lining stopper mold 32, and the second lining stopper mold 32 is rotated counterclockwise to make the hard sealing strip 2 located at the angle where the second lining stopper mold 32 and the lining template 31 are connected. The hard sealing strip 2 is close to the right end of the first section of lining, and concrete is poured for the first section of lining;

[0025] 2. When the concrete strength of the first section lining reaches 75% or the pouring time reaches 20h-24h, the second lining stopper mold 32 is rotated clockwise, and a half construction joint is formed at the right end of the first section lining, and the cross section of the half construction joint is the same as the cross section of the hard sealing strip 2; the lining template 31 is lowered and separated from the first section lining, and the first section lining forms a state of poured lining 4;

[0026] 3. Move the second lining trolley 3 to the second lining position, the second lining state is the lining 5 to be poured, the soft sealing strip 1 is placed on the lining template 31 close to one end of the poured lining 4, and the isosceles surface of the isosceles triangle body 11 is fitted with the half construction joint in step 2, and the rubber buffer strip 12 is located between the lining template 31 and the poured lining 4; rotate the second lining stopper mold 32 counterclockwise so that the hard sealing strip 2 is located at the angle where the second lining stopper mold 32 and the lining template 31 are connected, and the hard sealing strip 2 is close to the right end of the lining 5 to be poured, and concrete is poured on the lining 5 to be poured;

[0027] Fourth, when the concrete strength of the lining 5 to be poured reaches 75% or the pouring time reaches 20h-24h, the second lining stopper mold 32 is rotated clockwise to form a construction joint 6 at the right end of the poured lining 4. The cross section of the construction joint 6 is the same as the cross section of the isosceles triangle body 11, and a half construction joint is formed at the right end of the lining 5 to be poured;

[0028] 5. Repeat steps 3 to 4.

[0029] In combination with the actual situation on site, the present invention adds a hard sealing strip 2 to the second lining stopper mold 32 to change the original 90° right angle area into a 45° chamfer. The chamfer setting can avoid the generation of loose bodies at the 90° corner, which requires additional later grinding and increases costs. In combination with the front end of the lining template 31, a soft sealing strip 1 is set, which is beneficial to positioning the second lining trolley 3 without damaging the lining end of the poured section. After the soft sealing strip 1 is removed, a naturally smooth triangular area without loose bodies is formed between the two adjacent linings, which solves the problem of loose bodies being blown off and hitting trains to cause accidents in the prior art.

[0030] The above embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A V-shaped assembly device suitable for tunnel construction joints, characterized in that: The invention comprises a soft sealing strip (1) and a hard sealing strip (2), wherein the soft sealing strip (1) and the hard sealing strip (2) are respectively mounted on a secondary lining trolley (3), wherein the secondary lining trolley (3) comprises a lining template (31) and a secondary lining stopper mold (32), wherein the lining template (31) and the secondary lining stopper mold (32) form a right angle (33), wherein the soft sealing strip (1) is arranged at the left end of the lining template (31), and the hard sealing strip (2) is arranged on the secondary lining stopper mold (32) and is disposed at a right angle (33). The hard sealing strip (2) is a right-angled triangle, and the cross section of the hard sealing strip (2) is a right-angled triangle, and the right-angled triangle overlaps with half of the cross section of the isosceles triangle body (11).

2. The V-shaped assembly device suitable for tunnel construction joints as claimed in claim 1, characterized in that: The soft sealing strip (1) is made of rubber, the hard sealing strip (2) is made of stainless steel, and the hard sealing strip (2) is welded to the second lining stopper die (32).

3. The V-shaped assembly device suitable for tunnel construction joints as claimed in claim 2, characterized in that: The thickness of the rubber buffer belt (12) is 3mm-5mm.

4. The V-shaped assembly device suitable for tunnel construction joints as claimed in claim 3, characterized in that: The vertex angle of the cross section of the isosceles triangle main body (11) is 90°, and the acute angle of the cross section of the hard sealing strip (2) is 45°.

5. The V-shaped assembly device suitable for tunnel construction joints as claimed in claim 4, characterized in that: The soft sealing strip (1) and the hard sealing strip (2) are both in the shape of an optimal arc, and the curvature and arc length of the optimal arc are consistent with the curvature and arc length of the secondary lining.

6. A construction method for a V-shaped assembly device suitable for a tunnel construction joint, characterized in that: The following steps are included:

1. When the first section of lining is poured, the hard sealing strip (2) is installed around the second lining stopper mold (32), and the second lining stopper mold (32) is rotated counterclockwise so that the hard sealing strip (2) is located at the angle where the second lining stopper mold (32) and the lining template (31) are connected. The hard sealing strip (2) is closely attached to the right end of the first section of lining, and concrete is poured on the first section of lining; 2. When the concrete strength of the first section lining reaches 75% or the pouring time reaches 20h-24h, the second lining stopper mold (32) is rotated clockwise to form a half construction joint at the right end of the first section lining, and the cross section of the half construction joint is the same as the cross section of the hard sealing strip (2); the lining template (31) is lowered and separated from the first section lining, and the first section lining forms a poured lining (4); 3. Move the second lining trolley (3) to the second lining position, the second lining state is the lining to be poured (5), the soft sealing strip (1) is placed on the lining template (31) close to one end of the poured lining (4), and the isosceles surface of the isosceles triangle body (11) is in contact with half of the construction joint in step 2, and the rubber buffer strip (12) is located between the lining template (31) and the poured lining (4); rotate the second lining stopper mold (32) counterclockwise so that the hard sealing strip (2) is located at the angle where the second lining stopper mold (32) and the lining template (31) are connected, and the hard sealing strip (2) is close to the right end of the lining to be poured (5), and concrete is poured on the lining to be poured (5); 4. When the concrete strength of the lining (5) to be poured reaches 75% or the pouring time reaches 20h-24h, the second lining stopper mold (32) is rotated clockwise to form a construction joint (6) at the right end of the poured lining (4). The cross section of the construction joint (6) is the same as the cross section of the isosceles triangle body (11), and a half construction joint is formed at the right end of the lining (5) to be poured; 5. Repeat steps 3 to 4.

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