Anchorage groove structure for prestressed concrete lining of hydraulic tunnel and construction method thereof

Abstract

A prestressed concrete lining anchor groove structure for hydraulic tunnels, comprising an anchor groove, wherein the anchor groove is a groove body that is narrow at the top and wide at the bottom; the anchor groove is assembled from two side templates, a bottom template, a left end template and a right end template, the side template is Z-shaped, the two side templates are relatively assembled on the bottom template, and the two side templates are inclined toward the center above the bottom template to form a groove body that is narrow at the top and wide at the bottom, and is smaller on the right and larger on the left, side key bars are arranged on the outer surfaces of the two side templates, a left end key bar is arranged on the outer surface of the left end template, and a right end key bar is arranged on the outer surface of the right end template, and steel strand holes are arranged on the left end template and the right end template. The side templates, bottom templates and end templates of the present invention are all made of ultra-high toughness cement-based composite materials, and each template is made into a non-disassembly template, which improves the construction progress, reduces environmental pollution, reduces unnecessary waste of funds and resources, and significantly improves its economic benefits, social benefits and engineering value.

Description

Technical Field

[0001] The invention relates to the field of annular tunnel structure design and construction technology in the technical field of hydraulic engineering, and in particular to a design and construction method of a hydraulic annular tunnel prestressed concrete lining anchor groove structure. Background Art

[0002] With the progress of society and the development of circular tunnel construction in water conservancy projects, its application scope is getting wider and wider, so its uses are also increasing. At present, it has been widely used in engineering fields such as concrete pressure pipelines, pressure water diversion tunnels, water storage tanks, sedimentation tanks, digestion tanks, material silos, nuclear power plant containment, bridge tower anchorage areas, and TV tower ring plate foundations at home and abroad.

[0003] Although the design and construction technology of prestressed concrete structures of annular tunnels are relatively mature, the anchor groove area in the annular prestressed lining has become the weakest link with the most complex stress state in the entire lining section due to the absence of prestress inside the anchor groove. Therefore, the problem of the anchor groove area is the focus and difficulty in design and construction. The anchor groove in the tunnel structure includes the bottom surface, side surface, end surface and top plate, and the corresponding ones are the bottom formwork, side formwork and end formwork. At present, the anchor groove in the annular prestressed lining is often combined in the form of a side formwork and an end formwork perpendicular to the bottom formwork, and the side formwork is perpendicular to the end formwork to form an anchor groove with a complete rectangular space. Finally, when pouring concrete, the top plate is covered. After the pouring is completed, the formwork can be removed. Since the anchor groove is generally located in the lower half of the structure and is at an angle to the vertical direction, the traditional anchor groove opening method easily makes it difficult to backfill the post-filled concrete densely, resulting in poor bonding and anchoring performance between the post-filled concrete in the anchor groove and the lining concrete, affecting the prestressing effect in the anchor groove and its surroundings, and causing oil and water seepage in the anchor groove after backfilling. Summary of the invention

[0004] In order to promptly and effectively solve the technical problem of poor bonding and anchoring performance between post-fill concrete and lining concrete of an anchor groove, the present invention provides a prestressed concrete lining anchor groove structure for a hydraulic tunnel and a construction method thereof, which can effectively increase the bonding and anchoring performance between post-fill concrete and lining concrete.

[0005] A prestressed concrete lining anchor groove structure for a hydraulic tunnel comprises an anchor groove, which is a groove body that is narrow at the top and wide at the bottom; the anchor groove is assembled from two side templates, a bottom template, a left end template and a right end template, the side templates are Z-shaped, the two side templates are relatively assembled on the bottom template, and the two side templates are inclined toward the center above the bottom template to form a groove body that is narrow at the top and wide at the bottom, and is smaller on the right and larger on the left; side key bars are arranged on the outer surfaces of the two side templates, a left end key bar is arranged on the outer surface of the left end template, and a right end key bar is arranged on the outer surface of the right end template, and steel strand holes are arranged on the left end template and the right end template.

[0006] The above-mentioned prestressed concrete lining anchor groove structure for hydraulic tunnels has a bottom key strip arranged on the bottom outer surface of the bottom template.

[0007] The above-mentioned prestressed concrete lining anchor groove structure for hydraulic tunnels has a top frame of the side formwork that is an arc-shaped frame.

[0008] The above-mentioned prestressed concrete lining anchor groove structure for hydraulic tunnels, the two side templates are inclined toward the center above the bottom template, the angle between the two side templates and the plane where the bottom template is located is 85°-88°, and the left end template and the right end template are both arranged perpendicular to the plane where the bottom template is located.

[0009] The above-mentioned prestressed concrete lining anchor groove structure for hydraulic tunnels, the two side templates are inclined toward the center above the bottom template, the angle between the two side templates and the plane where the bottom template is located is 88°, and the left end template and the right end template are both set perpendicular to the plane where the bottom template is located.

[0010] The above-mentioned prestressed concrete lining anchor groove structure for hydraulic tunnels, the side key bars are evenly arranged on the two side templates, the end key bars are evenly arranged on the left end template and the right end template, and the bottom key bar is evenly arranged on the bottom template.

[0011] The above-mentioned prestressed concrete lining anchor groove structure for hydraulic tunnels, the side key bars, end key bars and bottom key bars have the same height, the side key bars, end key bars and bottom key bars have the same thickness, and the height h is 20mm, the thickness d is 3mm, and the interval between adjacent key bars is 20mm.

[0012] The construction method of the prestressed concrete lining anchor groove structure for hydraulic tunnels comprises the following steps:

[0013] a. Mark the anchor slot position on the reinforcement skeleton of the hydraulic tunnel;

[0014] b. Place the bottom template at the marked position and fix it;

[0015] c. Insert the side formwork onto the fixed bottom formwork;

[0016] d. Pass the steel strands through the steel strand holes of the left end formwork and the steel strand holes of the right end formwork in sequence;

[0017] e. Insert the left and right end templates into the bottom template and side templates to form the two ends of the frame;

[0018] f. Cover the top formwork, press it tightly, and pour concrete around the formwork;

[0019] g. After pouring, remove the top formwork and reuse it multiple times.

[0020] In the above-mentioned construction method of the prestressed concrete lining anchor groove structure for hydraulic tunnels, the bottom formwork, two side formworks, left end formwork and right end formwork are all ultra-high toughness cement composite material formworks.

[0021] By adopting the above technical solution, the present invention has the following technical effects:

[0022] The present invention is used for the design of the anchor groove structure of the prestressed concrete lining of a hydraulic annular tunnel and its construction method, including the groove opening form of the anchor groove, that is, the setting of the side key bars and the end key bars, the material of the anchor groove template, the left end template and the right end template which both have the function of the steel strand perforation positioning device in the anchor groove, and the control of the deformation of the side template of the anchor groove template to ensure the forming size of the anchor groove.

[0023] Side key bars and end key bars are arranged around the anchor groove to increase the contact area between the new and old concretes during the later construction and strengthen the bonding performance of the two. The side formwork and the bottom formwork form an inclination angle of 85°-88°, and the end formwork and the bottom formwork are still arranged in a vertical shape, so that the overall inverted funnel-shaped trough body with "small on top and large on bottom" is formed to increase the bonding and anchoring properties of the concrete filled after the anchor groove and the lining concrete, and the side formwork adopts a Z-shape to form a trough body with a large left and a small right, which not only saves space but also increases the contact area between the new and old concretes. The side formwork, bottom formwork and end formwork of the present invention are all made of ultra-high toughness cement-based composite materials, and each formwork is made into a non-disassembly formwork, which improves the construction progress, reduces environmental pollution, reduces unnecessary waste of funds and resources, and significantly improves its economic benefits, social benefits and engineering value. Between each formwork, a bayonet method is used to assemble to form a prefabricated assembled formwork structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the anchor groove structure of the present invention.

[0025] Figure 2 It is a structural schematic diagram of the anchor groove during construction of the present invention.

[0026] Figure 3 It is a structural schematic diagram of the bottom template of the present invention.

[0027] Figure 4It is a structural schematic diagram of the side template of the present invention.

[0028] Figure 5 It is a structural schematic diagram of the left end template of the present invention.

[0029] Figure 6 It is a structural schematic diagram of the right end template of the present invention.

[0030] Figure 7 The left end template steel strand hole and Figure 8 Corresponding relationship diagram of the steel strand holes in the right end template.

[0031] Figure 8 The right end template steel strand hole and Figure 7 Corresponding relationship diagram of the steel strand holes on the left end of the template. DETAILED DESCRIPTION

[0032] The specific scheme and construction method of the present invention are described in detail below with reference to the accompanying drawings.

[0033] like Figure 1-Figure 6 As shown, a prestressed concrete lining anchor groove structure for hydraulic tunnels includes an anchor groove 1, which is a groove body 11 that is narrow at the top and wide at the bottom; the anchor groove is assembled by two side templates 3, a bottom template 6, a left end template 4 and a right end template 5, the side template is Z-shaped, the two side templates are relatively assembled on the bottom template, and the two side templates are inclined toward the center above the bottom template to form a groove body that is narrow at the top and wide at the bottom, and is smaller on the right and larger on the left. Side key bars 7 are arranged on the outer surfaces of the two side templates, a left end key bar 8 is arranged on the outer surface of the left end template, and a right end key bar is arranged on the outer surface of the right end template. Steel strand holes 9 are arranged on both the left end template and the right end template, and a bottom key bar 2 is arranged on the bottom outer surface of the bottom template. In this way, key bars are arranged around and at the bottom of the groove body to increase the bonding and anchoring properties of the concrete filled after the anchor groove and the lining concrete.

[0034] The prestressed concrete lining anchor groove structure for a hydraulic tunnel has a top frame of a side formwork that is an arc-shaped frame to adapt to the tunnel structure.

[0035] The prestressed concrete lining anchor groove structure for hydraulic tunnels has two side templates that are inclined toward the center above the bottom template, an angle between the two side templates and the plane where the bottom template is located is 85°-88°, and the left end template and the right end template are both arranged perpendicular to the plane where the bottom template is located.

[0036] The best solution for the prestressed concrete lining anchor groove structure for hydraulic tunnels is that both side templates are inclined toward the center above the bottom template, the angle between the two side templates and the plane where the bottom template is located is 88°, and the left end template and the right end template are both set perpendicular to the plane where the bottom template is located.

[0037] In the prestressed concrete lining anchor groove structure for hydraulic tunnel, the side key bars are evenly arranged on the two side templates, the end key bars are evenly arranged on the left end template and the right end template, and the bottom key bar is evenly arranged on the bottom template. The side key bars, the end key bars and the bottom key bars have the same height, the side key bars, the end key bars and the bottom key bars have the same thickness, and the height h is 20 mm, the thickness d is 3 mm, and the interval between adjacent key bars is 20 mm.

[0038] The construction method of the prestressed concrete lining anchor groove structure for hydraulic tunnels comprises the following steps:

[0039] a. Mark the anchor slot position on the reinforcement skeleton of the hydraulic tunnel;

[0040] b. Place the bottom template at the marked position and fix it;

[0041] c. Insert the side template onto the fixed bottom template, and use a wedge to embed it into the hole with a reserved diameter of 5mm at the junction of the bottom template and the side template;

[0042] d. Pass the steel strands through the steel strand holes of the left end formwork and the steel strand holes of the right end formwork in sequence;

[0043] The specific operations are as follows: Figure 7 and Figure 8 As shown, the strand hole 1A of the left end template corresponds to the strand hole 1B of the right end template; the strand hole 2A of the left end template corresponds to the strand hole 2B of the right end template; the strand hole 3A of the left end template corresponds to the strand hole 3B of the right end template; the strand hole 4A of the left end template corresponds to the strand hole 4B of the right end template; the strand hole 5A of the left end template corresponds to the strand hole 5B of the right end template; the strand hole 6A of the left end template corresponds to the strand hole 6B of the right end template; the strand hole 7A of the left end template corresponds to the strand hole 7B of the right end template The strand hole 7B corresponds to the strand hole 7B; the strand hole 8A of the left end template corresponds to the strand hole 8B of the right end template. During construction, the first steel strand passes through the steel strand hole 1A of the left end template and the steel strand hole 1B of the right end template, and a section of the steel strand is reserved outside the left and right end templates; similarly, the second steel strand passes through the steel strand hole 2A of the left end template and the steel strand hole 2B of the right end template, and a section of the steel strand is reserved outside the left and right end templates; in this way, all the steel strands are passed through the corresponding steel strand holes of the left and right end templates one by one.

[0044] e. Insert the left and right templates into the bottom template and side templates to form a frame; insert wedges into the reserved holes with a diameter of 5 mm at the intersection of the bottom of the left and right templates with the bottom template, and insert wedges into the reserved holes with a diameter of 5 mm at the intersection of the left and right templates with the two side templates;

[0045] f. Cover the top formwork, press it tightly, and pour concrete around the formwork;

[0046] g. After pouring, remove the top formwork and the top plate can be used multiple times.

[0047] In the construction method of the prestressed concrete lining anchor groove structure for a hydraulic tunnel, the bottom formwork, the two side formworks, the left end formwork and the right end formwork are all ultra-high toughness cement composite material formworks.

[0048] The design of the anchor groove structure of the prestressed concrete lining of the hydraulic annular tunnel of the present invention and the construction method thereof include the groove opening form of the anchor groove, that is, the setting of the side key bars and the end key bars, the material of the anchor groove template, the left end template and the right end template which both have the function of the steel strand perforation positioning device in the anchor groove, and the control of the deformation of the anchor groove side template to ensure the forming size of the anchor groove.

[0049] Side key bars, left end key bars and right end key bars are arranged around and on the outer surface of the anchor groove to increase the contact area between the new and old concretes and strengthen the bonding performance of the two. The side formwork and the bottom formwork form an inclination angle of 85°-88°, and the left end formwork and the right end formwork are still arranged in a vertical shape with the arc bottom formwork, so that the whole will form an inverted funnel shape of "small on the top and large on the bottom" to increase the bonding and anchoring properties of the concrete filled after the anchor groove and the lining concrete, and the side formwork adopts a Z shape, which not only saves space but also increases the contact area of ​​the new and old concrete. The side formwork, the bottom formwork, the left end formwork and the right end formwork of the present invention are all made of ultra-high toughness cement-based composite materials, and each formwork is made into a non-disassembly formwork, which improves the construction progress, reduces environmental pollution, reduces unnecessary waste of funds and resources, and significantly improves its economic benefits, social benefits and engineering value. Between each formwork, a prefabricated assembled formwork structure is formed by assembling in a bayonet manner, and finally a wedge with a diameter of 5mm is inserted to achieve a close combination effect between the two. The structure of the clip is a serrated clip with a size of 100 mm and an inclination angle of 5°.

[0050] Specific implementation methods are given above, but the present invention is not limited to the described implementation methods. The basic idea of ​​the present invention lies in the above basic scheme. For ordinary technicians in this field, it does not require creative work to design various deformed models, formulas, and parameters according to the methods and principles of the present invention. Changes, modifications, substitutions, and variations of the implementation methods without departing from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A prestressed concrete lining anchor groove structure for a hydraulic tunnel, comprising an anchor groove, characterized in that: The anchor groove is a groove body which is narrow at the top and wide at the bottom; the anchor groove is assembled from two side templates, a bottom template, a left end template and a right end template, and the two side templates are both Z-shaped. The two side templates are relatively assembled on the bottom template, and the two side templates are inclined toward the center above the bottom template to form a groove body which is narrow at the top and wide at the bottom, and is smaller on the right and larger on the left. Side key strips are arranged on the outer surfaces of the two side templates, a left end key strip is arranged on the outer surface of the left end template, and a right end key strip is arranged on the outer surface of the right end template, and steel strand holes are arranged on the left end template and the right end template; a bottom key strip is arranged on the bottom outer surface of the bottom template; the top borders of the two side templates are arc-shaped borders.

2. The prestressed concrete lining anchor groove structure for hydraulic tunnel according to claim 1, characterized in that: The two side templates are inclined toward the center above the bottom template, the angle between the two side templates and the plane where the bottom template is located is 85°-88°, and the left end template and the right end template are both arranged vertically to the plane where the bottom template is located.

3. The prestressed concrete lining anchor groove structure for hydraulic tunnel according to claim 1, characterized in that: The two side templates are inclined toward the center above the bottom template, the angle between the two side templates and the plane where the bottom template is located is 88°, and the left end template and the right end template are both arranged perpendicular to the plane where the bottom template is located.

4. The prestressed concrete lining anchor groove structure for hydraulic tunnel according to claim 1, characterized in that: The side key strips are evenly arranged on the two side templates, the end key strips are evenly arranged on the left end template and the right end template, and the bottom key strips are evenly arranged on the bottom template.

5. The prestressed concrete lining anchor groove structure for hydraulic tunnel according to claim 1, characterized in that: The side key bars, end key bars and bottom key bars have the same height, the same thickness, and the height h is 20 mm, the thickness d is 3 mm, and the interval between adjacent key bars is 20 mm.

6. The construction method of the prestressed concrete lining anchor groove structure for hydraulic tunnel according to any one of claims 1 to 5, characterized in that: The following steps are included: Mark the anchor slot position on the hydraulic tunnel reinforcement skeleton; Place the bottom template at the marked position and fix it; Insert two side templates onto the fixed bottom template; Pass the steel strands through the steel strand holes of the left end formwork and the steel strand holes of the right end formwork in sequence; Insert the left and right end templates into the bottom template and two side templates to form the two ends of the frame; Cover the top formwork, press it tightly, and pour concrete around the outside of the formwork; After pouring, the top formwork is removed and reused multiple times.

7. The construction method of the prestressed concrete lining anchor groove structure for hydraulic tunnel according to claim 6, characterized in that: The bottom formwork, two side formworks, the left end formwork and the right end formwork are all ultra-high toughness cement-based composite material formworks.

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