A structure and method for pre-reserving bolt holes inside shield segment

Abstract

The present invention provides a structure for reserving bolt holes inside a shield segment, comprising an anchor, a segment steel formwork, and segment concrete. The segment steel formwork is provided with a groove that matches the anchor head, the anchor head extends into the groove and is connected to the segment steel formwork, the segment concrete is poured on the segment steel formwork, the anchor is pre-buried in the segment concrete along the radial direction of the segment, the hole wall extension direction of the groove is the same as the demoulding direction, and the side of the segment steel formwork away from the anchor is provided with a steel module for thickening, and the steel module is directly opposite to the groove. The present invention also provides a method for reserving bolt holes inside a shield segment, comprising the following steps: S1, milling a hexagonal groove on the segment steel formwork; S2, inserting a T-shaped anchor with a neodymium magnet into the groove and adsorbing it; S3, pouring segment concrete; S4, demoulding the segment concrete, and the T-shaped anchor is separated from the steel formwork with the concrete; S5, unscrewing the T-shaped anchor in a direction perpendicular to the inner arc surface of the segment to complete the bolt hole reservation.

Description

Technical Field

[0001] The invention relates to the field of shield segment template manufacturing, and in particular to a structure and method for pre-reserving bolt holes inside a shield segment. Background Art

[0002] At present, when installing cable trough brackets, contact network bases and other equipment on the internal segments of tunnels, manual drilling is mostly used to drill bolt holes inside the segments on both sides of the tunnel. However, due to the staggered assembly of the segments and the positioning of the drilling holes, the concrete around the holes is prone to cracks and fall off, and the drilling holes are prone to damage the steel bars and protective layers of the segments, which have an adverse effect on the stress and durability of the segments. Although the Halfen Trough can solve the problem of drilling holes in the later stage, it has problems such as complex production, relatively high cost, low utilization rate, and poor durability. Reserving bolts or bolt holes has become an economical and convenient option.

[0003] Regarding the production of the Haven Trough, a Chinese invention patent (CN201910248982.9, patent name: A device and method for installing a pre-buried Haven Trough) proposes an installation device and method suitable for positioning and installing the Haven Trough in a concrete member, including a building template with a cavity inside and steel bars and Haven Troughs inside the building template. The Haven Trough extends along the length of the building template. A plurality of bolt anchors are arranged on the rear side of the Haven Trough. One or more of the bolt anchors are connected and fixed to the steel bars through positioning bars. The front opening of the Haven Trough is close to one side of the building template. Although the precision of the pre-buried installation positioning of the Haven Trough and the simplification of the construction are achieved, the problems of cost and utilization rate cannot be solved.

[0004] The method of embedding bolts is also a way to solve the drawbacks of later hole openings. However, most of the pipe segments in tunnels are currently assembled using universal ring staggered seams, and there are also problems with embedding bolts.

[0005] Regarding the production of segment formwork and embedded bolts, a Chinese invention patent (CN201720608880.X, patent name: A template and segment structure for manufacturing shield tunnel segments) proposes a template for manufacturing shield tunnel segments, including a template body and a plurality of positioning parts for connecting with connecting parts; the positioning parts are detachably arranged on the upper surface of the template body. The connecting parts are independently arranged in the segment body; the connecting parts are distributed at intervals in the segment body. This patent mainly adopts the pre-embedded method, and the bolts are embedded in the concrete of the segment. Although the opening and grooving of holes are reduced, the rotation angle of the segment changes during the staggered rotation of the segment, and the bolts need to be arranged in a full ring, resulting in a waste of bolts.

[0006] Therefore, it is necessary to design a new structure and method for reserving bolt holes inside shield segments to overcome the above problems. Summary of the invention

[0007] The purpose of the present invention is to overcome the defects of the prior art and provide a structure and method for reserving bolt holes inside a shield segment. The present invention at least solves some of the problems in the prior art.

[0008] The present invention is achieved in that:

[0009] The present invention provides a structure for pre-reserving bolt holes inside a shield segment, comprising an anchor, a segment steel template, and segment concrete. The segment steel template is provided with a groove matched with the anchor head, the anchor head extends into the groove and is connected to the segment steel template, the segment concrete is poured on the segment steel template, the anchor is pre-embedded in the segment concrete along the radial direction of the segment, the hole wall extension direction of the groove is the same as the demoulding direction, and a steel module for thickening is provided on the side of the segment steel template away from the anchor, and the steel module is directly opposite to the groove.

[0010] Preferably, the anchor is a T-shaped anchor, the cross-section of the anchor head perpendicular to the radial direction of the segment is hexagonal, and the segment steel template is provided with a hexagonal groove that cooperates with the anchor head.

[0011] Preferably, the anchor head is provided with a nepheline magnet for adsorbing the segment steel formwork.

[0012] Preferably, the neodymium magnet is fixedly connected to the anchor head by an adhesive.

[0013] Preferably, the anchor rod is provided with a sleeve or coated.

[0014] Preferably, the anchor is a steel anchor.

[0015] The present invention also provides a method for reserving bolt holes inside a shield segment, comprising the following steps: S1, milling a hexagonal groove on a steel template of the segment; S2, inserting a T-shaped anchor with a neodymium magnet into the groove and adsorbing it; S3, pouring segment concrete, and vibrating and curing the concrete; S4, demolding the segment concrete, and the T-shaped anchor is separated from the steel template along with the concrete; S5, unscrewing the T-shaped anchor in a direction perpendicular to the inner arc surface of the segment to complete the bolt hole reservation, and the T-shaped anchor is reused.

[0016] The present invention has the following beneficial effects:

[0017] 1. The method of combining the T-shaped anchor nail and the groove proposed in the present invention can be reused without damaging the manufacturing quality and accuracy of the pipe segment, and is economical and reliable.

[0018] 2. The head of the T-shaped anchor proposed by the present invention can prevent the anchor from deformation and overturning during the concrete pouring process, and the concrete pressure acting on the head can enhance stability.

[0019] 3. The present invention proposes a quick method for pre-reserving holes on a pipe segment, which can provide a stable and quick method for demoulding the reserved bolt holes of the pipe segment.

[0020] 4. The present invention proposes a quick method for pre-reserving holes on the pipe segment, which uses T-shaped anchors to reserve grooves on the steel template of the pipe segment, thereby solving the problem of inconsistency between the demoulding direction and the bolt direction.

[0021] 5. The present invention solves the problem of difficulties in demoulding caused by reserved holes for bolts of segments or reserved components in radial direction, while the segments are demoulded in vertical direction and the two directions are inconsistent, and facilitates the quick and convenient realization of reserved holes on the segments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 The cross section of the T-shaped anchor with neodymium magnet provided in the embodiment of the present invention after being inserted into a steel mold and poured with concrete;

[0024] Figure 2 A plan view of the installation of a T-shaped anchor on a steel formwork provided in an embodiment of the present invention;

[0025] Figure 3 A detailed structural diagram of a T-shaped anchor provided in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of a hexagonal groove milled on a steel template provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of a T-shaped anchor with a neodymium magnet provided in an embodiment of the present invention being inserted into a groove and adsorbed;

[0028] Figure 6 A schematic diagram of pouring segment concrete provided by an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of demoulding of segment concrete provided in an embodiment of the present invention;

[0030] Figure 8 A schematic diagram of unscrewing a T-shaped anchor to complete bolt hole reservation provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the 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.

[0032] like Figure 1-Figure 8 , Embodiment 1 of the present invention provides a structure for pre-reserved bolt holes inside a shield segment, comprising an anchor 1, a segment steel formwork 2, and a segment concrete 3, wherein the anchor 1 is a T-shaped anchor, and a groove 4 matching with an anchor head 9 is provided on the segment steel formwork 2, and the anchor head 9 extends into the groove 4 and is connected with the segment steel formwork 2, and the segment concrete 3 is poured on the segment steel formwork 2, and the anchor 1 is pre-embedded in the segment concrete 3 along the segment radial direction 5, and a reserved bolt hole 6 is formed after the anchor 1 is demolded, and the hole wall extension direction of the groove 4 is the same as the demolding direction 7, Figure 1 The demoulding direction 7 is vertical, and the side wall extension line of the anchor head 9 is also the same as the demoulding direction 7. A steel module 8 for thickening is provided on the side of the segment steel formwork 2 away from the anchor 1, and the steel module 8 is opposite to the groove 4.

[0033] The cross section of the anchor head 9 perpendicular to the radial direction of the pipe segment is hexagonal, and the pipe segment steel template 2 is provided with a hexagonal groove that matches the anchor head 9. The angle of the groove side wall is determined according to the angle between the hole position and the demoulding direction.

[0034] The anchor head 9 is provided with a neodymium magnet 10 for adsorbing the segment steel template 2. The neodymium magnet 10 is fixedly connected to the anchor head 9 by an adhesive 11.

[0035] The anchor 1 is a steel anchor to ensure rigidity and durability during construction. The anchor rod 12 is provided with a sleeve or a coating 13 to facilitate the T-shaped anchor to be detached from the segment concrete 3.

[0036] Embodiment 2 of the present invention provides a method for reserving bolt holes inside a shield segment, comprising the following steps: S1, milling a hexagonal groove on the segment steel template; S2, inserting a T-shaped anchor with a neodymium magnet into the groove and adsorbing it; S3, pouring segment concrete, and vibrating and curing the concrete; S4, demolding the segment concrete, and the T-shaped anchor is separated from the steel template along with the concrete; S5, unscrewing the T-shaped anchor along the direction perpendicular to the inner arc surface of the segment (along the radial direction 5 of the segment), completing the bolt hole reservation, and the T-shaped anchor is reused.

[0037] Figure 1 The figure shows the inclination angle 14 between the inner arc of the reserved segment and the horizontal direction.

[0038] The neodymium magnet 10 is connected to the head of the T-shaped anchor and connected with an adhesive 11 to ensure that the magnet is adsorbed on the T-shaped anchor during the demoulding process of the segment; the T-shaped anchor is made of steel to ensure rigidity and durability during construction; a sleeve or coating can be installed on the T-shaped anchor to facilitate the detachment of the T-shaped anchor from the segment; the head of the T-shaped anchor is hexagonal, corresponding to the groove on the steel template of the segment, and the angle of the groove side wall is determined according to the angle between the hole position and the demoulding direction.

[0039] The hole wall extension direction of the groove 4 is the same as the demoulding direction 7, and the side wall extension line of the anchor head 9 is the same as the demoulding direction 7, which solves the problem that the direction of the embedded bolt is inconsistent with the demoulding direction of the pipe segment.

[0040] The present invention proposes a structure of reserved holes in the segment template, which can effectively avoid the destruction and damage of the segment during the later stage of manual drilling of the segment, and solve the problem that the axis of the reserved hole is inconsistent with the demoulding direction. Its advantages are: 1. It can be reused; 2. The concrete is not damaged during the demoulding process; 3. It can be reused; 4. The structure is reliable and firm.

[0041] The present invention has the following main points: 1) The base of the magnetically fixed embedded steel part (T-shaped anchor) adopts a high magnetic force neodymium magnet; 2) The bottom of the segment steel template adopts a hexagonal groove, which fits with the anchor; 3) The problem of the inconsistency between the direction of the embedded bolt and the demoulding direction of the segment is solved by the folding angle of the anchor; 4) The anchor base pre-installed on the segment template adopts an enlarged form (the hexagonal groove on the segment steel template is enlarged) to increase stability and magnetic contact surface.

[0042] The present invention also provides a method for reserving bolt holes inside a shield segment, comprising the following steps: Figure 4 , S1, mill a hexagonal groove on the steel template of the pipe segment; Figure 5 , S2, insert the T-shaped anchor with nepheline magnet into the groove and adsorb it; Figure 6 , S3, pouring segment concrete, concrete vibrating and curing; Figure 7 , S4, the segment concrete is demoulded, and the T-shaped anchors are separated from the segment steel formwork along with the concrete; Figure 8 , S5. Unscrew the T-shaped anchor along the inner arc surface of the vertical segment to complete the bolt hole reservation, and the T-shaped anchor is reused.

[0043] The invention relates to a component for installing special anchor nails on a pipe segment template to solve the problem of reserved bolt holes and reserved sleeves in the pipe segment.

[0044] The present invention solves the problem of difficulty in demoulding caused by reserved holes for bolts of pipe segments or reserved components in radial direction, while the demoulding of pipe segments is in vertical direction and the two directions are inconsistent, and facilitates the rapid and convenient realization of reserved holes on pipe segments.

[0045] The present invention proposes a quick method for pre-reserving holes on a pipe segment, which uses T-shaped anchors to reserve grooves on the steel template of the pipe segment, thereby solving the problem of inconsistency between the demoulding direction and the bolt direction.

[0046] The method of combining the T-shaped anchor nail and the groove proposed in the present invention can be reused without damaging the manufacturing quality and accuracy of the pipe segment, and is economical and reliable.

[0047] The head of the T-shaped anchor nail provided by the present invention can prevent the anchor nail from deformation and overturning during the concrete pouring process, and the concrete pressure acting on the head can enhance stability.

[0048] The present invention provides a quick method for realizing reserved holes on a pipe segment, which can provide a stable and quick method for demoulding the reserved bolt holes of the pipe segment.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure for pre-reserving bolt holes inside a shield segment, characterized in that: It includes an anchor, a segment steel formwork, and segment concrete. The segment steel formwork is provided with a groove that matches the anchor head. The anchor head extends into the groove and is connected to the segment steel formwork. The segment concrete is poured on the segment steel formwork. The anchor is pre-buried in the segment concrete along the radial direction of the segment. The extension direction of the hole wall of the groove is the same as the demoulding direction. A steel module for thickening is provided on the side of the segment steel formwork away from the anchor, and the steel module is opposite to the groove. The anchor is a T-shaped anchor, and the cross-section of the anchor head perpendicular to the radial direction of the segment is hexagonal. The segment steel formwork is provided with a hexagonal groove that matches the anchor head. The anchor head is provided with a nepheline magnet for adsorbing the segment steel formwork.

2. The structure of reserved bolt holes inside the shield segment according to claim 1, characterized in that: The neodymium magnet is fixedly connected to the anchor head by an adhesive.

3. The structure of reserved bolt holes inside the shield segment according to claim 1, characterized in that: The anchor rod portion is provided with a sleeve or a coating.

4. The structure of reserved bolt holes inside the shield segment according to claim 1, characterized in that: The anchor is a steel anchor.

5. A method for reserving bolt holes inside a shield segment, applied to the structure for reserving bolt holes inside a shield segment as claimed in any one of claims 1 to 4, characterized in that: The method comprises the following steps: S1, milling a hexagonal groove on the steel template of the pipe segment; S2, inserting a T-shaped anchor with a neodymium magnet into the groove and adsorbing it; S3, pouring the pipe segment concrete, and vibrating and curing the concrete; S4, demoulding the pipe segment concrete, and the T-shaped anchor is separated from the steel template along with the concrete; S5, unscrewing the T-shaped anchor in a direction perpendicular to the inner arc surface of the pipe segment to complete the bolt hole reservation, and the T-shaped anchor is reused.

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