Tunnel consolidation grouting hole positioning device
By using a consolidated grout hole positioning device in tunnel construction, the waste holes and structural damage caused by passing through the steel mesh during drilling is solved, and efficient and accurate grout hole positioning is achieved, protecting the concrete structure and appearance quality.
Patent Information
- Application Number
- CN202510033595.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-04-08
AI Technical Summary
In tunnel construction, consolidation grouting holes are prone to pass through the steel mesh during drilling, resulting in damage to the waste holes and concrete structures. The existing pre-embedded PVC pipe methods are difficult to accurately locate, and are prone to deposition or loss due to concrete pouring and vibration.
A tunnel-consolidated grout hole positioning device is designed, including a nut sleeve, a screw and a support plate. By pre-determining the grout hole position on the steel mold trolley template, installing the nut sleeve and a support plate, and using the screw to pass through the grout hole, ensuring that the grout hole avoids the steel mold trolley's position by observing and fine-tuning the position of the steel mold trolley.
Effectively avoid hole wall reinforcement mesh, reduce the probability of waste holes, improve drilling efficiency, and protect the concrete structure and appearance quality.
Smart Images
Figure CN119777948A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of tunnel lining and grouting construction, and in particular to a tunnel consolidation grouting hole positioning device. Background Art
[0002] Tunnel construction should determine the support form according to different surrounding rock types. For Class IV and V surrounding rock, shotcrete support + lining support is usually adopted. The cavern with completed lining needs to be backfilled and consolidated grouting. The backfill grouting hole is shallow, and the grouting hole only needs to pass through the lining concrete and internal steel bars. The method of drilling after lining can be adopted; and the consolidation grouting depth is generally not less than 3.0m. The grouting hole needs to pass through the shotcrete support layer + lining support layer to penetrate into the surrounding rock. There are many steel meshes passed through, which is easy to cause waste holes. At present, the following two methods are basically adopted for consolidation grouting drilling: (1) Drilling after lining Tunnels are usually lined with steel formwork trolleys, and grouting is performed after the lining concrete reaches a certain strength. The consolidation grouting holes are drilled with a drilling rig. During the tunnel spray anchor support and lining, 3 to 5 layers of steel mesh, including hanging steel bars, arch frames and connecting bars, and lining steel bars, have been installed in the tunnel wall. During the drilling process, it is necessary to drill through all the steel meshes and drill into the rock. It is very easy to drill into the steel bars and have to rework and drill again.
[0003] Changing the drilling position in the same area causes damage to the concrete structure in the area, and the appearance quality of the concrete after sealing is also affected.
[0004] (2) Pre-buried PVC pipes before lining and drilled before grouting When tying the lining steel bars, a PVC pipe will be embedded in the location where drilling is required. One end of the PVC pipe will be close to the steel formwork trolley template, and the other end will be against the hole wall. After the lining concrete reaches a certain strength, a drilling rig will be used to drill holes. The drill rod will directly drill the sprayed concrete surface and rock in the embedded PVC pipe. In theory, the steel bars can be avoided when drilling.
[0005] However, in actual construction, after the steel formwork trolley moves to the position for pouring, personnel can no longer enter the warehouse, so the PVC pipe must be pre-buried first and then the steel formwork trolley is positioned. It is difficult for the end of the PVC pipe to be close to the steel formwork trolley template, and there is often a certain gap between the end of the PVC pipe and the steel formwork trolley template. After the concrete is poured, the end of the PVC pipe will be buried, and the PVC pipe cannot be found after the mold is removed; and the pre-buried PVC pipe is easily collided and dislocated when the concrete material is put into the warehouse and vibrated, and personnel cannot enter the warehouse to correct it, making the pre-buried PVC pipe unusable. If the pre-buried PVC pipe cannot be found or cannot be used, it cannot be effectively blocked, and a cavity will be formed in the concrete structure, which will have an adverse effect on the structure of the concrete. Summary of the invention
[0006] In order to solve the problems of the prior art, the present invention provides a tunnel consolidation grouting hole positioning device. During the tunnel lining, positioning holes are reserved for tunnel consolidation grouting, so that the tunnel wall steel bars are effectively avoided when drilling.
[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A tunnel consolidation grouting hole positioning device, comprising: The nut sleeve is a cylindrical structure with an internal thread arranged inside. The length of the nut sleeve is 80 mm. The screw is a round rod-shaped structure with an external thread on its outer surface, and the screw and the nut sleeve are matched and correspondingly arranged; A support plate is fixed to the outer surface of the nut sleeve. There are multiple support plates distributed around the outer periphery of the nut sleeve. There are three support plates, and the length of the support plates is 120 mm. According to the consolidation grouting drawing, determine the grouting hole position on the steel mold trolley template, install a nut sleeve on the outside of the corresponding hole position, weld the three support plates and the steel mold trolley template firmly, and pass the screw through the grouting hole; The device relates to a method of use, which comprises the following steps: (1) After the steel formwork trolley is initially positioned, the construction personnel use a wrench to unscrew the screw rod and observe through the nut sleeve into the warehouse to check whether the lining steel bars block the consolidation grouting holes. They also judge whether the sprayed anchor support steel bars block the consolidation grouting holes based on the appearance of the sprayed anchor support. If the steel bars block the grouting holes, it is necessary to fine-tune the position of the steel formwork trolley so that the hole position avoids the lining steel bars and sprayed anchor support steel bars; (2) After confirming that all holes are away from the steel bars, fix the steel formwork trolley, screw the screw into the nut sleeve and pass it through the steel formwork trolley template into the warehouse 10 to 12 cm, and then pour the concrete; (3) After the concrete has initially set, unscrew all the screws out of the nut sleeves and then remove the formwork; after the formwork is removed, small holes with a diameter of 25 mm and a depth of 10 to 12 cm will remain on the surface of the concrete; (4) After the concrete reaches a certain strength, drilling for consolidation grouting is carried out. The drill drills along the small holes left on the concrete surface without drilling into the steel mesh.
[0008] Screw diameter 25mm, screw length L=300mm; The outer end is fixed at the lower part of the screw, and the outer end is a square structure with a length of 40mm, which is convenient for a wrench to twist the screw. The screw and the nut sleeve can use a coarse thread structure.
[0009] Compared with the prior art, the invention has the following beneficial effects: the invention can be used in hydraulic tunnels, traffic tunnels and other caverns that require lining and consolidation grouting, which greatly reduces the probability of waste holes, is beneficial to the control of drilling construction progress, and protects the formed concrete structure and appearance quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.
[0011] Figure 1 It is a schematic diagram of frequently changing the drilling positions in the same area of the present invention.
[0012] Figure 2 It is a schematic diagram of the pre-buried PVC pipe of the present invention.
[0013] Figure 3 The structure of the present invention is schematically shown Figure 1 .
[0014] Figure 4 The structure of the present invention is schematically shown Figure 2 .
[0015] Figure 5 It is a schematic diagram of the distribution state when the present invention is used.
[0016] Figure 6 yes Figure 5 Schematic diagram of the structure at point A in the middle. DETAILED DESCRIPTION
[0017] The present invention is further described in detail below by examples, which are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0018] A tunnel consolidation grouting hole positioning device, comprising: The nut sleeve 100 is a cylindrical structure with an internal thread arranged therein; the nut sleeve 100 is 80 mm long; The screw 200 is a round rod-shaped structure, and an external thread is arranged on its outer surface. The screw 200 and the nut sleeve 100 are matched and arranged accordingly; an outer end 210 is fixed at the lower part of the screw 200, and the outer end 210 is a square structure. The length of the outer end 210 is 40mm, which is convenient for the wrench to twist the screw. The screw 200 and the nut sleeve 100 can use a coarse thread structure; the diameter of the screw 200 is 25mm, and the length of the screw 200 is L=300mm; The support plate 300 is fixed to the outer surface of the nut sleeve 100 . There are multiple support plates 300 distributed around the outer periphery of the nut sleeve 100 . There are three support plates 300 , and the length of the support plates 300 is 120 mm.
[0019] According to the consolidation grouting drawing, the grouting hole positions are determined on the steel mold trolley template 400, a nut sleeve 100 is installed outside the corresponding hole position, the three support plates 300 and the steel mold trolley template 400 are welded firmly, and the screw rod 200 passes through the grouting hole.
[0020] Positioning device usage principle and method: (1) After the steel formwork trolley is initially positioned, the construction personnel use a wrench to unscrew the screw rod 200, and observe through the nut sleeve 100 into the warehouse to check whether the lining steel bars block the consolidation grouting holes, and judge whether the sprayed anchor support steel bars block the consolidation grouting holes based on the appearance of the sprayed anchor support. If the steel bars block the grouting holes, it is necessary to fine-tune the position of the steel formwork trolley so that the hole position avoids the lining steel bars, sprayed anchor support steel bars, etc.
[0021] (2) After confirming that all holes are away from the steel bars, fix the steel formwork trolley, screw the screw 200 into the nut sleeve 100 and pass through the steel formwork trolley template 400 into the warehouse for 10 to 12 cm, and then pour concrete.
[0022] (3) After the concrete has initially set, all screws 200 are screwed out of the nut sleeves 100, and then the formwork is removed. After the formwork is removed, small holes with a diameter of 25 mm and a depth of 10 to 12 cm will remain on the concrete surface.
[0023] (4) After the concrete reaches a certain strength, drilling for consolidation grouting is carried out. The drill drills along the small holes left on the concrete surface without drilling into the steel mesh.
[0024] A consolidation grouting hole positioning device is installed on the steel formwork trolley. When positioning the steel formwork trolley, the grouting hole is positioned at the same time, so that the grouting hole avoids the steel mesh in the silo. After the lining is completed, drilling according to the positioning mark can effectively avoid the steel mesh in the hole wall, speed up the drilling progress, reduce the proportion of waste holes, and ensure the lining concrete structure and appearance quality.
[0025] Project Introduction The entrance tunnel of a pumped storage power station is 1588.05m long. The entrance tunnel passes through 3 faults and 2 alteration zones. The overall surrounding rock condition is poor. There are about 1000m of Class IV and V surrounding rock tunnel sections that need lining. After the lining is completed, backfilling and consolidation grouting work must be carried out. The consolidation grouting hole enters the rock 3.0m.
[0026] Implementation Results The consolidation grouting drilling of the access tunnel of a pumped storage power station was carried out by adding a grouting hole positioning device on the lining steel formwork trolley. The number of holes drilled in one go accounted for more than 94%, which improved the drilling efficiency and protected the appearance quality of the concrete.
[0027] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.
Claims
1. A tunnel consolidation grouting hole positioning device, characterized in that: include: The nut sleeve is a cylindrical structure with an internal thread arranged inside. The length of the nut sleeve is 80 mm. The screw is a round rod-shaped structure with an external thread on its outer surface, and the screw and the nut sleeve are matched and correspondingly arranged; A support plate is fixed to the outer surface of the nut sleeve, and the support plates are multiple and distributed around the outer periphery of the nut sleeve; There are three support plates, and the length of the support plates is 120mm; According to the consolidation grouting drawing, determine the grouting hole position on the steel mold trolley template, install a nut sleeve on the outside of the corresponding hole position, weld the three support plates and the steel mold trolley template firmly, and pass the screw through the grouting hole; The device relates to a method of use, which comprises the following steps: (1) After the steel formwork trolley is initially positioned, the construction personnel use a wrench to unscrew the screw rod and observe through the nut sleeve into the warehouse to check whether the lining reinforcement blocks the consolidation grouting hole. The construction personnel also judge whether the sprayed anchor support reinforcement blocks the consolidation grouting hole based on the appearance of the sprayed anchor support. If the steel bar blocks the grouting hole, it is necessary to fine-tune the position of the steel formwork trolley so that the hole avoids the lining steel bar and the sprayed anchor support steel bar; (2) After confirming that all holes are away from the steel bars, fix the steel formwork trolley, screw the screw into the nut sleeve and pass it through the steel formwork trolley template into the warehouse 10 to 12 cm, and then pour the concrete; (3) After the concrete has initially set, unscrew all the screws out of the nut sleeves and then remove the formwork; after the formwork is removed, small holes with a diameter of 25 mm and a depth of 10 to 12 cm will remain on the surface of the concrete; (4) After the concrete reaches a certain strength, drilling for consolidation grouting is carried out. The drill drills along the small holes left on the concrete surface without drilling into the steel mesh.
2. The tunnel consolidation grouting hole positioning device according to claim 1, characterized in that: The screw diameter is 25mm and the screw length is L=300mm.
3. The tunnel consolidation grouting hole positioning device according to claim 2, characterized in that: The outer end is fixed at the lower part of the screw, and the outer end is a square structure with a length of 40mm, which is convenient for a wrench to twist the screw. The screw and the nut sleeve can use a coarse thread structure.