Settlement pre-control device for upper step lagging jack in up-and-down step method construction
By designing the pre-control device for arch frame settlement of upper and lower steps construction, the welded steel plate and ratchet mechanism cantilever support and pre-control of the pre-control of the pre-control of the arch frame, the problems of suspending and settlement of upper steps in tunnel construction are solved, and the problems of suspending and settlement control of the arch frame in upper steps are improved. Construction safety.
Patent Information
- Application Number
- CN202420964408.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-07
AI Technical Summary
In tunnel concealed excavation construction, when the upper and lower steps are used, the lower steps are small, resulting in too much hanging of the upper steps, which poses safety hazards and cannot effectively control the settlement of the arch.
Design a pre-control device for settlement of upper step arch frames for upper step arch frames by welding the arch frame steel plate and L-shaped cantilever steel plate, combined with the ratchet mechanism and adjustment block, to achieve the cantilever support reinforcement of the arch frames to be excavated to prevent Hang and pre-control of settlement through ratchet mechanism.
Effectively prevent the arch frame from hanging during excavation of the lower steps, ensure construction safety, and reduce settlement risks through pre-control measures, making the construction process more controllable.
Smart Images
Figure CN222228576U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tunnel construction, in particular to a device for pre-controlling the settlement of an upper step arch frame in an up-and-down step method construction. Background Art
[0002] In tunnel excavation, considering the safety of the primary support structure during construction, the upper and lower steps method is used, and the step distance of the steps is not more than 5m. This method can reduce the risk of soil collapse during the upper step excavation. At the same time, the primary support structure is closed into a ring as soon as possible to reduce the overall settlement of the structure. However, the step distance of the upper and lower steps is small, and a safe slope ratio cannot be formed during the excavation of the lower step. If the slope is too long, the upper step arch frame will be suspended too much, which will cause a greater safety hazard. Therefore, a device is needed to control the settlement of the upper step arch frame. Utility Model Content
[0003] In view of this, the problem to be solved by the utility model is to provide a settlement pre-control device for the upper step arch frame of the up-down step method construction, through which the two steel arch frames to be excavated are cantilevered and reinforced to prevent the construction arch frame from being suspended in the air when the lower step is excavated, and the settlement after excavation is pre-controlled to ensure safe construction.
[0004] The utility model solves the above technical problems through the following technical means: The utility model provides a device for pre-controlling the settlement of an upper step arch frame in an up-and-down step method construction, comprising:
[0005] Arch frame steel plates: the arch frame steel plates are respectively welded and arranged on the arch frame that has been placed at the bottom and the arch frame to be connected;
[0006] Cantilever steel plate: the cantilever steel plate is arranged in an L shape, and a first through hole matched with the arch frame steel plate is arranged on the vertical section of the cantilever steel plate, and the cantilever steel plate is installed on the arch frame steel plate on the bottom arch frame through the first through hole, and a groove corresponding to the arch frame to be connected is arranged on the upper side surface of the transverse section of the cantilever steel plate, and the groove is arranged directly below the arch frame steel plate on the arch frame to be connected, and a sleeve and a ratchet mechanism are arranged on the side surface of the cantilever steel plate, and an adjusting block is movably arranged in the groove, and a card slot corresponding to the lower end of the arch frame steel plate is arranged on the upper end surface of the adjusting block, and a sliding rod matching the sleeve is arranged on the adjusting block, and a rack lifting column meshing with the ratchet mechanism is arranged at the lower end of the sliding rod.
[0007] Furthermore, the ratchet mechanism includes a rotating shaft fixed on the cantilevered steel plate, a ratchet engaged with the rack lifting column, a locking block for locking the ratchet, and a lifting wrench for rotating the ratchet. The ratchet is rotatably arranged on the rotating shaft, and the ratchet is engaged with the rack on the rack lifting column.
[0008] Furthermore, the cantilevered steel plate is also provided with limit blocks, the limit blocks are provided on both side surfaces of the cantilevered steel plate, and the limit blocks are provided on both sides of the groove.
[0009] Furthermore, the width of the slot is greater than the width of the lower end of the arch steel plate.
[0010] Furthermore, the ratchet mechanism is provided with two sets, and the two sets of ratchet mechanisms are symmetrically arranged on both sides of the rack lifting column, and racks meshing with the ratchet mechanisms are respectively arranged on both sides of the rack lifting column.
[0011] Furthermore, a first reinforcing plate is provided between the transverse section and the vertical section of the cantilevered steel plate, and second reinforcing plates are provided on both sides of the first through hole.
[0012] Furthermore, reinforcing rib plates are respectively provided on both sides of the arch steel plate.
[0013] It can be seen from the above technical scheme that the beneficial effects of the utility model are as follows: the utility model provides a pre-control device for the settlement of an upper step arch frame constructed by the up-and-down step method, including an arch frame steel plate: the arch frame steel plates are respectively welded and arranged on the arch frame that has been put to the bottom and the arch frame to be connected; a cantilever steel plate: the cantilever steel plate is arranged in an L shape, and a first through hole matched with the arch frame steel plate is arranged on the vertical section of the cantilever steel plate, and the cantilever steel plate is installed on the arch frame steel plate on the arch frame that has been put to the bottom through the first through hole, and a groove corresponding to the arch frame to be connected is arranged on the upper side surface of the transverse section of the cantilever steel plate, and the groove is arranged directly below the arch frame steel plate on the arch frame to be connected, and a sleeve and a ratchet mechanism are arranged on the side surface of the cantilever steel plate, and an adjusting block is movably arranged in the groove, and a card slot corresponding to the lower end of the arch frame steel plate is arranged on the upper end surface of the adjusting block, and a sliding rod matching the sleeve is arranged on the adjusting block, and a rack lifting column meshed with the ratchet mechanism is arranged at the lower end of the sliding rod. This device is used to cantilever and reinforce the two steel arch frames that are about to be excavated, to prevent the construction arch frames from being suspended in the air when excavating the lower steps, and to pre-control the settlement after excavation, so that safe construction can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.
[0015] Figure 1 A front view of a pre-control device for upper step arch settlement in an upper and lower step method construction provided by the utility model;
[0016] Figure 2A three-dimensional structural diagram of a settlement pre-control device for an upper step arch frame in an upper and lower step method construction provided by the utility model;
[0017] Reference numerals:
[0018] 1-arch steel plate; 2-cantilever steel plate; 3-bottomed arch; 4-arch steel frame to be connected; 11-reinforcement rib plate; 21-vertical section; 22-transverse section; 211-first through hole; 221-groove; 23-adjustment block; 231-rack lifting column; 26-sleeve; 232-slot; 233-sliding rod; 24-ratchet; 241-lifting wrench; 242-locking block; 25-limiting block; DETAILED DESCRIPTION
[0019] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.
[0020] See also Figures 1-2 The utility model provides a device for pre-controlling the settlement of an upper step arch frame in an up-and-down step method construction, comprising:
[0021] Arch frame steel plate 1: the arch frame steel plate 1 is welded and arranged on the bottomed steel frame 3 and the arch frame 4 to be connected respectively; the arch frame steel plate 1 is welded on the bottomed arch frame to provide a fulcrum for the cantilever steel plate 2; the arch frame steel plate 1 is welded on the arch frame 4 to be connected as a force point to lift the arch frame with connection;
[0022] Cantilever steel plate 2: The cantilever steel plate 2 is set to be L-shaped, and a first through hole 211 matched with the arch frame steel plate 1 is set on the vertical section 21 of the cantilever steel plate 2, and the cantilever steel plate 2 is installed on the arch frame steel plate 1 on the bottom steel frame 3 through the first through hole 211. A groove 221 corresponding to the arch frame 4 to be connected is set on the upper side surface of the transverse section 22 of the cantilever steel plate 2, and the groove 221 is set directly below the arch frame steel plate 1 on the arch frame 4 to be connected. A sleeve 26 and a ratchet mechanism are set on the side of the cantilever steel plate 2, and an adjusting block 23 is movably set in the groove 221. A card slot 232 corresponding to the lower end of the arch frame steel plate 1 is set on the upper end surface of the adjusting block 23, and a sliding rod 233 matching the sleeve 26 is set on the adjusting block 23, and a rack lifting column 231 meshing with the ratchet mechanism is set at the lower end of the sliding rod. Through the arch steel plate 1 welded on the arch that has been laid to the bottom, the cantilever steel plate 2 is used to cantilever and support the two steel arches to be excavated to prevent the construction arch from hanging in the air when the lower step is excavated. The ratchet 24 structure and the jacking column are lifted up before the lower step is excavated to form a pre-lift to pre-control the settlement after excavation. At the same time, the jacking plate sawtooth mechanism can adapt to the spacing deviation during the arch installation process. After the bottom is laid, the cantilever connection plate can be removed and recycled.
[0023] As a further improvement to the above technical solution, the ratchet mechanism includes a rotating shaft fixed on the cantilevered steel plate 2, a ratchet 24 meshed with the rack lifting column 231, a locking block 242 for locking the ratchet 24, and a lifting wrench 241 for rotating the ratchet 24. The ratchet 24 is rotatably arranged on the rotating shaft, and the ratchet 24 is meshed with the rack on the rack lifting column 231. The adjusting block 23 is lifted by the ratchet mechanism, and the ratchet mechanism is locked by the locking block 242 to fix the position of the adjusting block 23.
[0024] As a further improvement to the above technical solution, the cantilevered steel plate 2 is further provided with a limit block 25, which is provided on both sides of the cantilevered steel plate 2, and the limit block 25 is provided on both sides of the groove 221. The limit blocks 25 are provided on both sides of the cantilevered steel plate 2 to limit the adjustment block 23 to prevent the adjustment block 23 from swinging or shaking, and the limit blocks 25 prevent the adjustment block 23 from being positioned in the horizontal direction.
[0025] As a further improvement to the above technical solution, the width of the slot 232 is greater than the width of the lower end of the arch steel plate 1. The width of the slot 232 is greater than the width of the lower end of the arch steel plate 1 so that the steel frame steel plate can be inserted into the slot 232 without displacement.
[0026] As a further improvement to the above technical solution, the ratchet mechanism is provided with two sets, and the two sets of ratchet mechanisms are symmetrically arranged on both sides of the rack lifting column 231, and racks meshing with the ratchet mechanisms are respectively arranged on both sides of the rack lifting column 231. Ratchet mechanisms are respectively arranged on both sides of the rack lifting column 231 to lift and lock it, so that when the rack lifting column is subjected to force, both sides can be subjected to force evenly without deformation or instability.
[0027] As a further improvement to the above technical solution, a first reinforcing plate is further provided between the transverse section 22 and the vertical section 21 of the cantilevered steel plate 2, and a second reinforcing plate is provided on both sides of the first through hole 211. The triangular first reinforcing plate is provided between the transverse section 22 and the vertical section 21 of the cantilevered steel plate 2 to increase the strength at the corners; the second reinforcing plates are provided on both sides of the first through hole 211 to increase the strength at the stress-bearing position.
[0028] As a further improvement to the above technical solution, reinforcing ribs 11 are respectively provided on both sides of the arch frame steel plate 1. The triangular reinforcing ribs 11 perpendicular to the arch frame steel plate 1 are provided on both sides of the arch frame steel plate 1 to increase its strength so that it can bear the weight of the arch frame 4 to be connected without deformation.
[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.
Claims
1. A device for pre-controlling the settlement of an upper step arch frame in an up-and-down step method construction, characterized in that: include, Arch frame steel plates: the arch frame steel plates are respectively welded and arranged on the arch frame that has been placed at the bottom and the arch frame to be connected; Cantilever steel plate: the cantilever steel plate is arranged in an L shape, and a first through hole matched with the arch frame steel plate is arranged on the vertical section of the cantilever steel plate, and the cantilever steel plate is installed on the arch frame steel plate on the bottom arch frame through the first through hole, and a groove corresponding to the arch frame to be connected is arranged on the upper side surface of the transverse section of the cantilever steel plate, and the groove is arranged directly below the arch frame steel plate on the arch frame to be connected, and a sleeve and a ratchet mechanism are arranged on the side surface of the cantilever steel plate, and an adjusting block is movably arranged in the groove, and a card slot corresponding to the lower end of the arch frame steel plate is arranged on the upper end surface of the adjusting block, and a sliding rod matching the sleeve is arranged on the adjusting block, and a rack lifting column meshing with the ratchet mechanism is arranged at the lower end of the sliding rod.
2. The device for pre-controlling the settlement of the upper step arch frame in the construction of the upper and lower step method according to claim 1 is characterized by: The ratchet mechanism includes a rotating shaft fixed on the cantilevered steel plate, a ratchet engaged with a rack lifting column, a locking block for locking the ratchet, and a lifting wrench for rotating the ratchet. The ratchet is rotatably arranged on the rotating shaft, and the ratchet is engaged with a rack on the rack lifting column.
3. The device for pre-controlling the settlement of the upper step arch frame in the construction of the upper and lower step method according to claim 2 is characterized by: The cantilevered steel plate is also provided with limit blocks, the limit blocks are arranged on both side surfaces of the cantilevered steel plate, and the limit blocks are arranged on both sides of the groove.
4. The device for pre-controlling the settlement of the upper step arch frame in the construction of the upper and lower step method according to claim 3 is characterized by: The width of the slot is greater than the width of the lower end of the arch steel plate.
5. The device for pre-controlling the settlement of the upper step arch frame in the construction of the upper and lower step method according to claim 4 is characterized by: The ratchet mechanism is provided with two sets, and the two sets of ratchet mechanisms are symmetrically arranged on both sides of the rack lifting column. Racks meshing with the ratchet mechanisms are respectively arranged on both sides of the rack lifting column.
6. The device for pre-controlling the settlement of the upper step arch frame in the construction of the upper and lower step method according to claim 1 is characterized by: A first reinforcing plate is further arranged between the transverse section and the vertical section of the cantilevered steel plate, and second reinforcing plates are arranged on both sides of the first through hole.
7. The device for pre-controlling the settlement of the upper step arch frame in the construction of the upper and lower step method according to claim 1 is characterized by: Reinforcement rib plates are respectively arranged on both sides of the arch steel plate.