A template for a secondary lining with a pre-reserved V-groove joint and its construction method

Abstract

This invention discloses a secondary lining plug template with a pre-reserved V-groove joint, comprising multiple sections of the secondary lining plug template body arranged parallel to each other along the tunnel circumference. Each secondary lining plug template body includes an upper mold, a lower mold, and a support rod. The upper and lower molds are arranged side-by-side and detachably connected by the support rod. The lower mold, from front to back, includes a lower panel, an inclined plate, and a second vertical plate connected sequentially. The rear end of the inclined plate is inclined outwards, forming a V-groove joint structure on the inner side of the inclined plate. A rubber strip is placed within the V-groove joint structure, with a triangular cross-section. The rubber strip is used to form a V-groove joint on the secondary lining at its location. This secondary lining plug template effectively solves the time-consuming and labor-intensive problem of secondary manual cutting of the joint after secondary lining demolding due to poor appearance quality of the circumferential construction joint. The upper mold can be disassembled into independent upper and lower sliding plate components, allowing for flexible disassembly and replacement.

Description

Technical Field

[0001] This invention belongs to the field of tunnel secondary lining construction technology, specifically relating to a secondary lining plug template with reserved V-groove joint and its construction method. Background Technology

[0002] After the formwork is removed during the secondary lining construction of the tunnel, the circumferential construction joints of adjacent secondary lining panels often have inconsistent joint widths and poor aesthetics. In actual construction, it is necessary to manually cut the joint edges a second time and then perform grouting, which is time-consuming and labor-intensive.

[0003] Telescopic polymer end caps are widely used in engineering as upper end caps. The lifting height of the end cap is generally adjusted by rotating a screw. However, the end cap is a one-piece structure, and if it is partially damaged during use, the entire end cap needs to be replaced, resulting in low material recycling efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a secondary lining plug template and construction method with reserved V-groove joints, which effectively solves the time-consuming and labor-intensive problem of secondary manual cutting of joints after secondary lining demolding due to poor appearance quality of circumferential construction joints; the upper mold is divided into independent upper sliding plate components and lower sliding plate components, which are flexible for disassembly and replacement.

[0005] This invention adopts the following technical solution: a secondary lining plug template with a reserved V-groove joint, comprising multiple sections of secondary lining plug template bodies arranged in parallel along the tunnel circumferential direction. Each secondary lining plug template body includes: an upper mold, a lower mold, and a support rod. The upper mold and the lower mold are arranged in parallel front and rear and are detachably connected by the support rod. The side of the upper mold and the lower mold facing the secondary lining is the inner side, and the side facing away from the secondary lining is the outer side. Wherein:

[0006] The lower mold comprises, from front to back, a lower panel, an inclined plate, and a second vertical plate connected in sequence. The rear end of the inclined plate is inclined outward, and a V-groove joint structure is formed on the inner side of the inclined plate. A rubber strip is set in the V-groove joint structure. The cross-section of the rubber strip is triangular, with the vertex of the triangle located at the front end of the V-groove joint structure and the base located at the rear end, with the outer end of the base extending beyond the position of the lower panel. The rubber strip is used to form a V-groove joint on the secondary lining at its location.

[0007] Furthermore, at the front end of the lower plate, a support plate extending outward is provided. Ear plates are welded to the outer side of the front part of the lower plate. There are at least two ear plates, which are spaced apart along the length of the lower mold. The front end of each ear plate is welded to the rear wall of the support plate. The rear end of the ear plate is hinged to a base, and the inner end of the base is fixedly connected to the trolley panel. The ear plate rotates radially inward and outward with the base as a support point, and is positioned and fixed when it rotates to the support position.

[0008] Furthermore, the upper mold includes an upper sliding plate assembly and a lower sliding plate assembly, which are detachably connected and can move back and forth.

[0009] Furthermore, the lower sliding plate assembly includes a lower sliding panel, and multiple lower base plates are spaced apart on the outer bottom of the lower sliding panel along its length. Each lower base plate is provided with a forward-facing lower bolt rod, and the front part of the lower bolt rod is provided with an external thread. The lower bolt rod is coaxially sleeved in a spiral sleeve and threadedly connected for connecting to the upper sliding plate assembly.

[0010] Furthermore, the upper slide plate assembly includes an upper top plate, and multiple upper base plates are spaced apart on the inner top of the upper top plate along its length. Each upper base plate is provided with a rearward upper bolt rod, and the lower rear part of the upper bolt rod is provided with an external thread. The upper bolt rod is coaxially sleeved in a spiral sleeve.

[0011] Furthermore, multiple lower reinforcing plates are provided on the outer wall of the lower sliding panel, and the multiple lower reinforcing plates are spaced apart along the length of the lower sliding panel; multiple upper reinforcing plates are provided on the outer wall of the upper top plate, and the multiple upper reinforcing plates are spaced apart along the length of the upper top plate; the number of upper reinforcing plates is the same as that of lower reinforcing plates, and their positions correspond to each other; the width of the upper reinforcing plate is consistent with the width of the slide rail of the lower reinforcing plate; the upper reinforcing plate is inserted into the slide rail.

[0012] Furthermore, the base is provided with a second bolt hole and a first bolt hole spaced apart front and back. The second bolt hole and the first bolt hole correspond to the positions of two through holes on the ear plate. The ear plate and the base are hinged at the first bolt hole. When the ear plate is rotated to the formwork support position, the positioning is completed by locking the second bolt hole.

[0013] This invention also discloses a construction method for a pre-reserved V-groove joint secondary lining end cap template, the construction method comprising the following steps:

[0014] Step 1: Install the rubber strip inside the V-groove joint structure, with the bottom of the rubber strip attached to the trolley panel;

[0015] Step 2: Flip the lower mold inward through the first screw hole until it aligns with the second screw hole, and then tighten and lock it with bolts.

[0016] Step 3: Lay the embedded waterstop along the circumferential direction on the support plate. Adjust the spiral sleeve radially to make the lower slide plate assembly in the upper mold press the embedded waterstop backward and the upper slide plate assembly press the elastic pad forward.

[0017] Step 4: After all the lower and upper molds of each segment of the ring are radially tightened, the support tube is passed through the first support ear, the second support ear, and the third support ear to fix the lower and upper molds laterally.

[0018] Step 5: When the secondary lining concrete has been poured into the formwork and reached the required strength for demolding, remove the support pipe, loosen the spiral sleeve, remove the elastic pad and the upper mold, loosen the second screw hole, and freely flip the lower mold to enter the next cycle of construction.

[0019] The beneficial effects of this invention are: 1. By setting a rubber strip with a triangular cross-section, a V-shaped circumferential construction joint is formed after the secondary lining is demolded, eliminating the need for secondary manual cutting of the joint, saving time on joint treatment between each secondary lining panel, effectively ensuring the quality of joint construction, and saving time and labor. 2. The upper mold is disassembled into independent upper and lower sliding plate components, which are connected into a whole by bolt sleeves. During reuse, this increases the flexibility of component disassembly and replacement, further improving efficiency. 3. The lower mold is a steel flip-up template, which is not easily deformed, effectively ensuring the overall rigidity of the template; in addition, the height of the lower panel can be customized according to the thickness specified in the design requirements, ensuring the position of the embedded waterstop. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view;

[0021] Figure 2 This is a circumferential unfolded diagram;

[0022] Figure 3 This is a cross-sectional view of the lower mold.

[0023] Figure 4 This is a circumferential unfolded view of the lower panel of the lower mold;

[0024] Figure 5 This is a cross-sectional view of the upper mold.

[0025] Figure 6 This is a cross-sectional view of the upper mold lower slide plate assembly;

[0026] Figure 7 This is a cross-sectional view of the upper mold lower slide plate assembly;

[0027] Figure 8 This is a plan view of the upper mold lower slide plate assembly;

[0028] Figure 9 This is a cross-sectional view of the upper mold slide assembly;

[0029] Figure 10 This is a cross-sectional view of the upper mold slide assembly;

[0030] Figure 11 This is a plan view of the upper mold sliding plate assembly.

[0031] The components are: 1. Lower mold, 2. Upper mold, 3. V-groove structure, 4. Elastic pad, 5. First support ear, 6. Second support ear, 7. Third support ear, 8. Support pipe, 9. Trolley end, 10. Trolley panel, 11. Embedded waterstop, 12. Back-adhesive waterstop, 1.1. Base, 1.2. Ear plate, 1.3. Lower panel, 1.4. Support plate, 1.5. First bolt, 1.6. Second bolt, 1.7. Screw hole. 2.1. Lower slide plate assembly; 2.2. Upper slide plate assembly; 2.3. Spiral sleeve; 2.1.1. Lower base plate; 2.1.2. Lower sliding panel; 2.1.3. Lower reinforcing plate; 2.1.4. Lower base plate; 2.1.5. Lower bolt rod; 2.2.1. Upper sliding panel; 2.2.2. Upper top plate; 2.2.3. Upper reinforcing plate; 2.2.4. Upper base plate; 2.2.5. Upper bolt rod; 3.1. Rubber strip; 3.2. Self-tapping screw. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] This invention provides a secondary lining plug template with a pre-reserved V-groove joint, such as... Figure 1 and 2 As shown, it includes an upper mold 2, a lower mold 1, and a support rod 8. The upper mold 2 and the lower mold 1 are arranged side by side and can be detachably connected by the support rod 8. The upper mold 2 and the lower mold 1 have the same length. The side of the upper mold 2 and the lower mold 1 facing the secondary lining is the inner side, and the side facing away from the secondary lining is the outer side.

[0034] The lower mold 1 is set between the trolley panel 10 and the embedded waterstop 11, and the upper mold 2 is set between the embedded waterstop 11 and the back-attached waterstop 12 of the initial lining surface. When the height adjustment is insufficient, a rubber pad 4 is set at the upper end of the upper mold 2, and the length of the rubber pad 4 is consistent with the length of the upper mold 2.

[0035] The lower mold 1 comprises, from front to back, a lower panel 1.3, an inclined plate, and a second vertical plate connected sequentially. The inclined plate is inclined outwards, forming a V-groove joint structure 3 on its inner side. A rubber strip 3.1 is disposed within the V-groove joint structure 3. The cross-section of the rubber strip 3.1 is triangular, with the vertex of the triangle located at the foremost part within the V-groove joint structure 3, and the base located at the rear end, with the inner end of the base extending beyond the position of the lower panel 1.3. The rubber strip 3.1 serves to form the V-groove joint at its location. The length of the rubber strip 3.1 is consistent with the length of the inclined plate.

[0036] Multiple screw holes 1.7 are spaced apart along the length of the inclined plate, and rubber strips 3.1 are fixed to the inclined plate by multiple self-tapping screws 3.2. The distance between two adjacent screw holes 1.7 is 150mm, and the diameter is 10mm; the bottom width of the rubber strip 3 is 40mm, and the height is 30mm. During formwork erection, the self-tapping screws 3.2 are inserted into the screw holes 1.7 to fix the rubber strip 3.1.

[0037] At the front end of the lower panel 1.3, a support plate 1.2 extending outward is provided. The support plate 1.2 is a plate body, and its length is the same as that of the lower panel 1.3. The lower panel 1.3 and the support plate 1.4 form an inverted L shape. The lower panel 1.3 is made of 10mm thick steel plate, and the support plate 1.4 is made of 6mm thick steel plate.

[0038] Ear plates 1.2 are welded to the outer front part of the lower plate 1.3. There are at least two ear plates 1.2, which are spaced apart along the length of the lower mold 1. The front end of each ear plate 1.2 is welded to the rear wall of the support plate 1.4. The ear plates 1.2 are made of 10mm thick steel plate. The ear plate 1.2 is an L-shaped plate, with its short arm welded to the outer front part of the lower plate 1.3, and two through holes spaced apart at the rear of its long arm. A base 1.1 is connected to the rear end of the ear plate 1.2. The base 1.1 has a second bolt hole 1.6 and a first bolt hole 1.5 spaced apart at the rear. The second bolt hole 1.6 and the first bolt hole 1.5 correspond to the positions of the two through holes on the ear plate 1.2, and the diameter of the second bolt hole 1.6 and the first bolt hole 1.5 is 22mm. The ear plate 1.2 and the base 1.1 are hinged at the first bolt hole 1.5, and are positioned by locking the second bolt hole 1.6 when the ear plate 1.2 is rotated to the formwork support position. The inner end of the base 1.1 is welded and fixed to the end of the trolley. The installation of the rubber strip 3.2 should be completed before the lower mold 1 is flipped and positioned.

[0039] like Figure 5 As shown, the upper mold 2 includes an upper sliding plate assembly 2.2 and a lower sliding plate assembly 2.1 that are detachably connected. The upper sliding plate assembly 2.2 and the lower sliding plate assembly 2.1 can move back and forth to change the front and rear width of the upper mold 2. The upper sliding plate assembly 2.2 and the lower sliding plate assembly 2.1 are connected as a whole by bolt sleeves 2.3 and are arranged in segments along the circumferential direction of the tunnel, with each segment being 650-700mm.

[0040] like Figure 6-8As shown, the sliding plate assembly 2.1 is made of plastic and includes a lower sliding panel 2.1.2. Multiple lower base plates 2.1.4 are spaced apart on the outer bottom of the lower sliding panel 2.1.2 along its length. Each lower base plate 2.1.4 has an upward and forward-facing lower bolt rod 2.1.5, with external threads at its front. A lower bottom plate 2.1.1, perpendicularly positioned to the lower end of the lower sliding panel 2.1.2, is connected to it, extending inwards. The length of the lower bottom plate 2.1.1 is the same as the length of the lower sliding panel 2.1.2. Multiple lower reinforcing plates 2.1.3 are provided on the outer wall of the lower sliding panel 2.1.2, spaced apart along its length. The rear end of each lower reinforcing plate 2.1.3 extends to the side wall of the lower bottom plate 2.1.1. The lower bolt rod 2.1.5 is a 22mm diameter steel bolt, which is fixedly installed on the lower base plate 2.1.4. Each lower reinforcing plate 2.1.3 consists of two plates spaced apart on the left and right, with a sliding track formed between the two plates.

[0041] like Figure 9-11 As shown, the upper sliding plate assembly 2.2 is made of plastic and includes an upper top plate 2.2.2. Multiple upper base plates 2.2.4 are spaced apart on the inner top of the upper top plate 2.2.2 along its length. Each upper base plate 2.2.4 has a rearward-facing upper bolt rod 2.2.5, with external threads at its rear. An upper sliding panel 2.2.1 is connected to the upper top of the upper top plate 2.2.2, perpendicular to it. The upper sliding panel 2.2.1 extends inward, and its length is the same as that of the upper top plate 2.2.2. Multiple upper reinforcing plates 2.2.3 are spaced apart on the outer wall of the upper top plate 2.2.2 along its length. The number of upper reinforcing plates 2.2.3 and lower reinforcing plates 2.1.3 is the same, and their positions correspond. The width of the upper reinforcing plate 2.2.3 is consistent with the width of the slide rail of the lower reinforcing plate 2.1.3. The upper bolt rod 2.2.5 uses a steel bolt with a diameter of 22mm.

[0042] The lower sliding panel 2.1.2 and the upper top plate 2.2.2 are stacked inside and outside. The lower bolt rod 2.1.5 and the upper bolt rod 2.2.5 are coaxially sleeved in the spiral sleeve 2.3. The inner wall of the spiral sleeve 2.3 is provided with internal threads, which are threaded to the lower bolt rod 2.1.5 and the upper bolt rod 2.2.5. Each upper reinforcing plate 2.2.3 is inserted into the corresponding slide rail. The upper top plate 2.2.2 and the lower sliding panel 2.1.2 can slide up and down to obtain upper mold 2 of different widths. The lower bolt rod 2.1.5 is a steel screw with a diameter of 22mm. To meet the requirements of different telescopic heights, the upper bolt rod 2.2.5, the lower bolt rod 2.1.5, and the spiral sleeve 2.3 of different lengths can be replaced. To facilitate the rotation and telescopic of the spiral sleeve 2.3, a corresponding spiral wrench can be provided.

[0043] This invention also discloses a construction method for a secondary lining end cap template with a reserved V-groove joint, the construction method comprising the following steps:

[0044] Step 1: Install the rubber strip 3.1 into the V-groove joint structure 3, with the bottom of the rubber strip 3.1 attached to the trolley panel;

[0045] Step 2: Flip the lower mold 1 inward through the first screw hole 1.5 until it aligns with the second screw hole 1.6, and tighten and lock it with bolts;

[0046] Step 3: Lay the embedded waterstop along the circumferential direction on the support plate 1.4. Adjust the spiral sleeve 2.3 radially to make the lower slide plate assembly 2.1 in the upper mold 2 press the embedded waterstop 11 backward and the upper slide plate assembly 2.2 press the elastic pad 4 forward.

[0047] Step 4: After all the lower mold 1 and upper mold 2 of each segment of the ring are radially tightened, the support tube 8 is passed through the first support ear 5, the second support ear 6, and the third support ear 7 to fix the lower mold 1 and upper mold 2 laterally. The first support ear 5, the second support ear 6, and the third support ear 7 are all plates. The inner ends of the second support ear 6 and the third support ear 7 are welded to the trolley template 8, and the inner end of the first support ear 5 is welded to the outer side of the upper mold 2.

[0048] Step 5: When the secondary lining concrete has been poured and formed to the required strength for demolding, remove the support pipe 8, loosen the spiral sleeve 2.3, remove the elastic pad 4 and the upper mold 2, loosen the second screw hole 1.6, and freely flip the lower mold 1 to enter the next cycle of construction.

Claims

1. A secondary lining end cap template with a pre-reserved V-groove joint, characterized in that, The system includes multiple sections of secondary lining end-forming template bodies, which are arranged side-by-side along the tunnel circumferential direction. Each section of the secondary lining end-forming template body includes an upper mold (2), a lower mold (1), and a support pipe (8). The upper mold (2) and the lower mold (1) are arranged side-by-side and detachably connected by the support pipe (8). The side of the upper mold (2) and the lower mold (1) facing the secondary lining is the inner side, and the side facing away from the secondary lining is the outer side. The lower end mold (1) comprises, from front to back, a lower panel (1.3), an inclined plate, and a second vertical plate connected in sequence. The rear end of the inclined plate is inclined outward, and a V-groove joint structure (3) is formed on the inner side of the inclined plate. A rubber strip (3.1) is provided in the V-groove joint structure (3). The cross-section of the rubber strip (3.1) is triangular, and the vertex of the triangle is located at the front end of the V-groove joint structure (3), the base is located at the rear end, and the outer end of the base extends beyond the position of the lower panel (1.3). The rubber strip (3.1) is used to form a V-groove joint on the secondary lining at its position. At the front end of the lower plate (1.3), a support plate (1.4) extending outward is provided. An ear plate (1.2) is welded to the outer side of the front part of the lower plate (1.3). There are at least two ear plates (1.2), which are spaced apart along the length of the lower mold (1). The front end of each ear plate (1.2) is welded to the rear wall of the support plate (1.4). The rear end of the ear plate (1.2) is hinged to a base (1.1). The inner end of the base (1.1) is fixedly connected to the trolley panel (10). The ear plate (1.2) rotates radially inward and outward with the base (1.1) as the support point, and is fixed in position when it rotates to the support position. The upper mold (2) includes an upper sliding plate assembly (2.2) and a lower sliding plate assembly (2.1). The lower sliding plate assembly (2.1) and the upper sliding plate assembly (2.2) are detachably connected, and the upper sliding plate assembly (2.2) and the lower sliding plate assembly (2.1) can move back and forth. The lower sliding plate assembly (2.1) includes a lower sliding panel (2.1.2). Multiple lower base plates (2.1.4) are spaced apart on the outer bottom of the lower sliding panel (2.1.2) along its length. Each of the lower base plates (2.1.4) is provided with a forward-facing lower bolt rod (2.1.5). The front part of the lower bolt rod (2.1.5) is provided with an external thread. The lower bolt rod (2.1.5) is coaxially sleeved in the spiral sleeve (2.3) and threadedly connected to connect the upper sliding plate assembly (2.2).

2. The secondary lining plug template with a reserved V-groove joint as described in claim 1, characterized in that, The upper slide assembly (2.2) includes an upper top plate (2.2.2). Multiple upper base plates (2.2.4) are spaced apart on the inner top of the upper top plate (2.2.2) along its length. Each upper base plate (2.2.4) is provided with a rearward upper bolt rod (2.2.5). The lower rear part of the upper bolt rod (2.2.5) is provided with an external thread. The upper bolt rod (2.2.5) is coaxially sleeved in the spiral sleeve (2.3).

3. The secondary lining plug template with a reserved V-groove joint as described in claim 2, characterized in that, Multiple lower reinforcing plates (2.1.3) are provided on the outer wall of the lower sliding panel (2.1.2), and the multiple lower reinforcing plates (2.1.3) are spaced apart along the length of the lower sliding panel (2.1.2); multiple upper reinforcing plates (2.2.2) are provided on the outer wall of the upper top plate (2.2.2). 2.2.3), multiple upper reinforcing plates (2.2.3) are spaced apart along the length of the upper top plate (2.2.2); the number of upper reinforcing plates (2.2.3) is the same as that of lower reinforcing plates (2.1.3), and their positions correspond to each other; the width of the upper reinforcing plate (2.2.3) is consistent with the width of the slide of the lower reinforcing plate (2.1.3); the upper reinforcing plate (2.2.3) is inserted into the slide.

4. The secondary lining plug template with a reserved V-groove joint as described in claim 3, characterized in that, The base (1.1) is provided with a second bolt hole (1.6) and a first bolt hole (1.5) spaced apart from each other. The second bolt hole (1.6) and the first bolt hole (1.5) correspond to the positions of two through holes on the ear plate (1.2). The ear plate (1.2) and the base (1.1) are hinged at the first bolt hole (1.5). When the ear plate (1.2) is rotated to the formwork support position, the positioning is completed by locking the second bolt hole (1.6).

5. A construction method for a secondary lining end cap template with a reserved V-groove joint as described in any one of claims 4, characterized in that, The construction method includes the following steps: Step 1: Install the rubber strip (3.1) into the V-groove joint structure (3), with the bottom of the rubber strip (3.1) attached to the trolley panel; Step 2: Flip the lower mold (1) inward through the first bolt hole (1.5) until it is aligned with the second bolt hole (1.6), and tighten and lock it with bolts; Step 3: Lay the embedded waterstop (11) on the support plate (1.4) in the circumferential direction. Adjust the spiral sleeve (2.3) radially so that the lower slide plate assembly (2.1) in the upper mold (2) presses the embedded waterstop (11) backward and the upper slide plate assembly (2.2) presses the elastic pad (4) forward. Step 4: After all the lower end molds (1) and upper end molds (2) of each segment of the ring are fully radially tightened, the support tube (8) is passed through the first support ear (5), the second support ear (6), and the third support ear (7) to fix the lower end molds (1) and upper end molds (2) laterally. Step 5: When the secondary lining concrete reaches the demolding strength after being poured into the mold, remove the support pipe (8), loosen the spiral sleeve (2.3), remove the elastic pad (4) and the upper mold (2), loosen the second bolt hole (1.6), and freely flip the lower mold (1) to enter the next cycle of construction.

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