Adjustable jig frame for machining secondary lining steel reinforcement framework

Abstract

The utility model discloses an adjustable jig frame for machining a secondary lining steel reinforcement framework. The adjustable jig frame comprises a bottom plate and bolt positioning pieces. A plurality of sliding grooves are formed in the bottom plate in the length direction of one arc-shaped area at intervals. The sliding grooves are formed in the thickness direction of the bottom plate in a penetrating mode. The inner arc of the arc-shaped area is matched with the top outline of the tunnel. The bolt positioning pieces are arranged in the sliding grooves at intervals and used for conducting pre-bending positioning on annular main reinforcements in the secondary lining steel reinforcement framework. The bolt positioning piece comprises a bolt and a nut; the bolts are arranged in the sliding grooves in a penetrating mode, extend upwards and are in limiting fit with the circumferential main reinforcements in the lateral direction; the nut fixes the bolt to any position in the length direction of the sliding groove through thread fit. When the jig frame is used for positioning and installing the secondary lining steel reinforcement framework, bolt positioning pieces are arranged on the two sides of any annular main reinforcement. According to the jig frame, the distance between the positioning pieces can be rapidly and flexibly adjusted according to secondary lining steel bar frameworks of different sizes, and the prefabricating efficiency of the secondary lining steel bar frameworks is improved through multiple purposes of one frame.

Description

TECHNICAL FIELD

[0001] The utility model relates to secondary lining structure construction technical field especially relates to a adjustable jig frame for secondary lining steel reinforcement framework processing. BACKGROUND

[0002] Secondary lining refers to the inner lining built by concrete and other materials under the condition that the tunnel has carried out primary support, to achieve the effect of reinforcement support, optimization of drainage system, convenient equipment setting. The steel reinforcement construction of secondary lining (referred to as "secondary lining") structure is optimized from on-site binding to centralized prefabrication, and arc-shaped secondary lining steel reinforcement framework needs to be prefabricated in the workshop, and then transported to the site for hoisting. When the secondary lining steel reinforcement framework is made, the corresponding jig frame needs to be welded to pre-bend the circumferential main reinforcement of the steel reinforcement framework, so as to weld the supporting reinforcement in the next step. The conventional pre-bending method is to weld positioning clamping reinforcement on the steel plate to position and bend the circumferential main reinforcement according to the design arc line of the secondary lining steel reinforcement framework.

[0003] In the extension direction of the tunnel, when the surrounding rock grade changes in a certain range, the thickness of the secondary lining structure needs to be adjusted to meet the corresponding support requirements. Correspondingly, the spacing of the circumferential reinforcement in the secondary lining steel reinforcement framework also changes. The traditional pre-bending jig frame needs to knock off the original positioning clamping reinforcement, and weld a new set of positioning clamping reinforcement to match the changed secondary lining steel reinforcement framework. This way is time-consuming, laborious and material-consuming, which is not only uneconomical, but also seriously affects the prefabrication efficiency of the secondary lining steel reinforcement framework. SUMMARY

[0004] The main technical problem to be solved by the utility model is to provide an adjustable jig frame for secondary lining steel reinforcement framework processing, which can quickly and flexibly adjust the spacing of the positioning member according to secondary lining steel reinforcement frameworks of different sizes, realizing "one frame for multiple uses".

[0005] In order to solve the above technical problems, the utility model provides an adjustable jig frame for secondary lining steel reinforcement framework processing, which comprises a bottom plate and a bolt positioning member.

[0006] The bottom plate is provided with a plurality of sliding grooves at intervals in the length extension direction of an arc-shaped area; the sliding grooves are provided through in the thickness direction of the bottom plate; the inner arc of the arc-shaped area matches the top profile of the tunnel;

[0007] The bolt positioning member is arranged at intervals in the sliding groove and is used for pre-bending and positioning the circumferential main reinforcement arranged in the length direction in the secondary lining steel reinforcement framework; the bolt positioning member comprises a bolt and a nut; the bolt is arranged in the sliding groove and extends vertically upward, and is limited in lateral direction with the circumferential main reinforcement; the nut clamps the bottom plate through thread cooperation with the bolt, and fixes the bolt at any position in the length direction of the sliding groove;

[0008] When the jig positions and installs the secondary lining steel reinforcement framework, two sides of any one of the circumferential main bars in the extension direction are provided with the bolt positioning members.

[0009] In a preferred embodiment, the chute extends perpendicularly to the length extension direction of the arc-shaped area.

[0010] In a preferred embodiment, the width of the chute is not less than the maximum thickness of the secondary lining structure of the tunnel engineering.

[0011] In a preferred embodiment, when the jig positions and installs the secondary lining steel reinforcement framework, in the extension direction of the circumferential main bars, the bolt positioning members in any two adjacent chutes abut on different sides of the circumferential main bars.

[0012] In a preferred embodiment, the number of bolt positioning members in the chute is equal to the number of circumferential main bars at the bottom of the secondary lining steel reinforcement framework.

[0013] In a preferred embodiment, the straight rod section of the bolt is made of round steel with a diameter not less than 20 mm.

[0014] In a preferred embodiment, the bottom plate is made of steel plate with a thickness not less than 10 mm.

[0015] In a preferred embodiment, the spacing of the chutes is between 50 cm and 80 cm.

[0016] Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:

[0017] The jig provided by the utility model can quickly and flexibly adjust the positioning distance of the steel bars by using the guiding effect of the chute and the detachable feature of the bolt positioning member, so as to serve the installation and manufacturing of secondary lining steel reinforcement frameworks of different sizes, and realize "one jig for multiple uses". Meanwhile, the bolt positioning members are staggered inside and outside to ensure the stable and reliable pre-bending positioning of the circumferential main bars. Therefore, the jig not only saves time and effort for steel bar installation and improves the construction efficiency of the secondary lining structure, but also can be used repeatedly, saves processing materials, and improves economic benefits. In addition, the jig is made of common construction components or materials and is simple to manufacture; the installation assembly is easy to disassemble and assemble, is convenient to carry and use repeatedly, and is convenient for subsequent maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 FIG. 1 is a whole plan view of the jig according to the utility model;

[0019] Fig. 2 FIG. 2 is a partial plan view of the jig according to the utility model;

[0020] Fig. 3 This is an AA cross-sectional view of the tire frame described in the embodiment of this utility model.

[0021] The markings in the diagram are: 1-base plate 1, 11-inner arc 11, 12-outer arc 12, 13-arc area 13, 14-slide groove 14, 2-bolt positioning part 2, 21-bolt 21, 22-nut 22, 3-circumferential main rib 3. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] like Figs. 1-3 As shown, this embodiment of the invention provides an adjustable jig for processing secondary lining steel reinforcement cages, including a base plate 1 and bolt positioning components 2. Generally, the base plate 1 has several grooves 14 spaced apart along a certain arc segment. The bolt positioning components 2 are spaced apart within the grooves 14 to pre-bend and position the circumferential main reinforcement bars 3 arranged along the length direction of the secondary lining steel reinforcement cage. Within the same groove 14, the spacing between adjacent bolt positioning components 2 is adjustable to fix a group of circumferential main reinforcement bars 3 with different spacings. The specific structure and connection relationship of each component of the jig are described in detail below with reference to the figures.

[0026] like Fig. 1 As shown, in this embodiment, the base plate 1 is a steel plate with a thickness of not less than 10 mm. Two parallel arcs are marked on the surface of the base plate 1, which are distinguished as an inner arc 11 and an outer arc 12 for ease of description. The inner arc 11 can be obtained from the top outline of the tunnel after completion in the tunnel engineering design drawings. The outer arc 12 of the base plate 1 is offset from the inner arc 11, and together with the inner arc 11, they form an arc-shaped region 13. A plurality of grooves 14 are provided at intervals along the extension direction of the arc-shaped region 13. If necessary, the grooves 14 penetrate through the thickness direction of the base plate 1. The grooves 14 are arranged along the normal direction of the inner arc 11 or the outer arc 12, and span the arc-shaped region 13, that is, the length of the groove 14 is equal to the width of the arc-shaped region 13. Considering that during subsequent use, when the bolt positioning component 2 is installed at both ends within the slide groove 14, it can still pre-bend and position the circumferential main reinforcement 3 of the secondary lining structure with the largest thickness, the length of the slide groove 14 should not be less than the maximum thickness of the secondary lining structure in this tunnel project. That is, when the outer arc line 12 is marked on the base plate 1, its offset distance relative to the inner arc line 11 should not be less than the maximum thickness of the secondary lining structure. To ensure high pre-bending accuracy of the circumferential main reinforcement 3 of the secondary lining steel reinforcement skeleton, in this embodiment, the spacing between two adjacent slide grooves 14 is controlled between 50cm and 80cm. To facilitate subsequent adjustment of the spacing by the bolt positioning component 2, a scale can be set on the edge of the slide groove 14.

[0027] For the aforementioned jig, the core structure of the chassis is the slide groove 14, particularly the length of the slide groove 14 and the shape of its arc. Therefore, this document does not limit the specific shape of the base plate 1. Furthermore, the inner arc 11 and outer arc 12 are merely auxiliary lines used to position the slide groove 14 during manufacturing; therefore, they are not essential structural features of the base plate 1.

[0028] like Fig. 3As shown, the bolt positioning member 2 adopts a set of threaded fasteners, including a bolt 21 and a nut 22. In this embodiment, the straight rod section of the bolt 21 is obtained by machining a round steel with a diameter of not less than 20 mm, and the length of the threaded section is not less than the sum of the thickness of the bottom plate 1 and the nut 22. If necessary, the diameter of the bolt 21 is not greater than the width of the sliding groove 14, and the outer diameter of the nut 22 is greater than the width of the sliding groove 14, otherwise the bolt positioning member 2 cannot be fixed to the sliding groove 14. The bolt positioning member 2 is arranged in the sliding groove 14 from bottom to top, and is fixed at any position in the length direction of the sliding groove 14 by the threaded connection between the bolt 21 and the thread. The bolt 21 should be long enough to stably abut on the bolt 21 when the subsequent circumferential main reinforcement 3 is limited and matched with the bolt positioning member 2, and is not easily separated.

[0029] The reinforcement has high toughness, and after bending, it will accumulate strong elastic recovery force. If there is no reliable fixing measure, it is difficult to maintain stable geometric shape after pre-bending. Therefore, the jig fixes two bolt positioning members 2 in the sliding groove 14 by supporting two bolts 21, which limits the lateral pre-bending of the circumferential main reinforcement 3. Specifically, as shown in Fig. 2 The two bolt positioning members 2 located in the sliding groove 14A are fixed to the outer side of the two circumferential main reinforcements 3, which limits the outward deviation of the circumferential main reinforcement 3 under the action of the elastic recovery force after pre-bending. The two bolt positioning members 2 located in the adjacent sliding groove 14B are fixed to the inner side of the two circumferential main reinforcements 3, which limits the inward deviation of the circumferential main reinforcement 3. In this way, the inward and outward deviation of the circumferential main reinforcement 3 is limited. Then, like the sliding groove 14A, the bolt positioning member 2 in the sliding groove 14C also limits the circumferential main reinforcement 3 from the outside……and so on. In the extension direction of the circumferential main reinforcement 3, the bolt positioning members 2 in any two adjacent sliding grooves 14 abut on different sides of the circumferential main reinforcement 3, and are arranged in an inner-outer staggered manner to stably position the circumferential main reinforcement 3 on the jig, so as to facilitate the next step of welding the supporting reinforcement on the circumferential main reinforcement 3. It should be understood that the number of bolt positioning members 2 in the same sliding groove 14 should not be limited to two, and the specific number is determined by the number of circumferential main reinforcements 3 in the two-liner reinforcement framework. In other embodiments, the number of bolt positioning members 2 in the same sliding groove 14 can be three or more.

[0030] When the surrounding rock grade in a certain range changes in the extension direction of the tunnel, the thickness of the secondary lining structure needs to be adjusted to meet the corresponding support requirements. For example, when the surrounding rock grade above the tunnel decreases, the hardness and stability of the rock layer decrease, at which time a thicker secondary lining structure needs to be built to strengthen the support of the surrounding rock. Correspondingly, the size of the secondary lining steel framework also changes. The traditional formwork cannot flexibly adjust the spacing of the positioning clamps, but needs to weld a new set of positioning clamps to be used with the changed secondary lining steel framework. Based on the above structure and connection relationship, the formwork provided by the embodiment of the utility model only needs to release the nut 22 of the bolt positioning piece 2, then adjust two bolt positioning pieces 2 in the same sliding groove 14 to an appropriate spacing by relying on the guiding action of the sliding groove 14, and then lock the nut 22, so that the two ring-shaped main reinforcement bars 3 of different secondary lining steel frameworks can be repositioned.

[0031] In summary, the formwork provided by the embodiment of the utility model can quickly and flexibly adjust the positioning distance of the steel bars by using the guiding action of the sliding groove 14 and the detachable feature of the bolt positioning piece 2, so as to serve the installation and manufacturing of secondary lining steel frameworks of different sizes, and realize "one formwork for multiple uses". At the same time, the bolt positioning piece 2 is arranged in an inner-outer staggered manner, which ensures the pre-bending positioning of the ring-shaped main reinforcement bar 3 to be stable and reliable. Therefore, the formwork not only saves time and effort for steel bar installation and improves the construction efficiency of the secondary lining structure, but also can be used repeatedly, saves processing materials, and improves economic benefits. In addition, the manufacturing materials of the formwork are common construction components or materials, and the manufacturing is simple; the installation assembly is easy to disassemble and assemble, which is convenient for carrying, turnover, and subsequent maintenance.

[0032] The above is only the preferred specific embodiment of the utility model, and does not limit the patent range of the utility model. Any technical equivalent transformation made by using the content of the utility model specification belongs to the protection range of the utility model.

Claims

1. An adjustable jig for processing secondary lining steel reinforcement cages, characterized in that: Includes base plate and bolt positioning components; The base plate is provided with a plurality of sliding grooves at intervals along the length of an arc-shaped region; the sliding grooves are provided through the thickness of the base plate; the inner arc of the arc-shaped region matches the top contour of the tunnel. The bolt positioning components are spaced apart within the groove for pre-bending and positioning the circumferential main reinforcement bars arranged along the length direction in the secondary lining steel reinforcement skeleton. The bolt positioning components include bolts and nuts. The bolts pass through the groove and extend vertically upward, engaging with the circumferential main reinforcement bars laterally. The nuts clamp the base plate through threaded engagement with the bolts, fixing the bolts at any position along the length direction of the groove. When the jig is used to position and install the secondary lining steel reinforcement skeleton, bolt positioning parts are provided on both sides of any one of the circumferential main bars in the extension direction.

2. The adjustable jig for processing secondary lining steel reinforcement cages according to claim 1, characterized in that: The groove is perpendicular to the length extension direction of the arc-shaped region.

3. An adjustable jig for processing secondary lining steel reinforcement cages according to claim 2, characterized in that: The width of the chute is not less than the maximum thickness of the secondary lining structure of the tunnel project.

4. An adjustable jig for processing secondary lining steel reinforcement cages according to claim 1, characterized in that: When the jig is used to position and install the secondary lining steel reinforcement skeleton, the bolt positioning parts in any two adjacent grooves abut against different sides of the circumferential main reinforcement in the extension direction of the circumferential main reinforcement.

5. An adjustable jig for processing secondary lining steel reinforcement cages according to claim 1, characterized in that: The number of bolt positioning parts in the groove is equal to the number of circumferential main bars at the bottom of the secondary lining steel reinforcement skeleton.

6. An adjustable jig for processing secondary lining steel reinforcement cages according to claim 1, characterized in that: The straight section of the bolt is made of round steel with a diameter of not less than 20 mm.

7. An adjustable jig for processing secondary lining steel reinforcement cages according to claim 1, characterized in that: The base plate is made of steel plate with a thickness of not less than 10 mm.

8. An adjustable jig for processing secondary lining steel reinforcement cages according to claim 1, characterized in that: The spacing between the grooves is between 50 cm and 80 cm.

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