Large-section wide-width single-box multi-chamber cast-in-place box girder combined temporary consolidation system

Abstract

The utility model relates to a large-section wide-width single-box multi-chamber cast-in-place box girder combined temporary consolidation system which is characterized in that a pier is arranged on a bearing platform, a cover beam is arranged above the pier, and a cast-in-place box girder is arranged on the cover beam; a concrete square column is temporarily arranged between the cast-in-place box beam and the bearing platform, temporary supports are arranged between the cover beam and the cast-in-place box beam, and a permanent support is arranged on the cover beam between the temporary supports. A dismantling device of the temporary support is further arranged. The utility model has the beneficial effects that the 0 # block adopts a steel pipe-channel steel combined bracket system, the clamping piece is propped against the bridge pier by adjusting the rotating bolt, the relative position of the sliding plate is accurately adjusted by utilizing the jack arranged between the connecting plate and the fixed frame, and the relative position of the inclined strut is adjusted by moving the sliding block; therefore, a safe and stable adjustable steel pipe-channel steel combined support system is formed.

Description

Technical Field

[0001] The utility model relates to the field of construction of a temporary consolidation system for a cast-in-place box girder, and in particular comprises a combined temporary consolidation system for a large-section, wide-width single-box multi-chamber cast-in-place box girder. Background Art

[0002] The widening construction of high-grade highways is developing rapidly and its application trend is widespread. The construction control of the 0# beam section, the starting section of the cantilever casting of the continuous beam main beam, is the most important and critical link in the entire bridge construction. Before the cantilever casting of the main beam, the top beam section of the bridge pier must be temporarily consolidated with the pier. The unreasonable temporary consolidation design of the continuous beam bridge may lead to construction accidents. In addition, it was found in actual construction that when temporary supports are used as temporary consolidation systems, the safety risks are high and the process is complicated when the supports are removed. Therefore, under the premise of ensuring the construction quality of large-section wide single-box multi-chamber cast-in-place box girders, it is necessary to integrate and form a new type of construction system plan for the problems of high construction risks and low construction efficiency found in the process. Utility Model Content

[0003] The utility model aims to overcome the deficiencies in the prior art and provide a large-section, wide-width single-box multi-chamber cast-in-place box girder combined temporary consolidation system.

[0004] This large-section, wide-width, single-box, multi-chamber cast-in-place box girder combined temporary consolidation system has bridge piers on the cap, cap beams on the piers, and cast-in-place box beams on the cap beams; concrete square columns are temporarily arranged between the cast-in-place box beam and the cap, temporary supports are arranged between the cap beam and the cast-in-place box beam, and permanent supports are arranged on the cap beam between the temporary supports; there is also a temporary support removal device;

[0005] A fixed frame is fixed at the end of the pier, and sliding plates are slidably provided on both sides of the fixed frame. Diagonal braces are slidably provided on the sliding plates, and the other end of the diagonal braces is connected to steel pipe piles. The bottom of the steel pipe piles is driven into the soil layer to form a steel pipe-channel steel combined support system;

[0006] The concrete square column is fixedly connected with an integrated operating platform attached to the column, and the operating platform is supported on a pressure plate of the integrated operating platform attached to the column through a jack.

[0007] Preferably, the fixing frame is placed at the end of the pier, and rotating bolts connected to clamping pieces are provided on both the front and rear sides of the fixing frame, and the rotating bolts are used to adjust the clamping pieces to tighten the pier; two limiting grooves are respectively provided on the left and right sides of the fixing frame, and a bottom plate extends below the limiting groove, and a sliding track is provided on the bottom plate; a sliding plate is inserted in the limiting groove, and the bottom of the sliding plate is placed in the sliding track of the bottom plate, and the two sliding plates on the same side are connected by a connecting plate in the fixing frame, and a jack is provided between the connecting plate and the inner wall of the fixing frame. The top of the base plate is provided with a sliding groove, a connecting shaft is passed through the end of the diagonal brace, and sliders are provided at both ends of the connecting shaft. The sliders are placed in the sliding groove of the sliding plate, and the relative position of the diagonal brace is adjusted by moving the sliders; a first sleeve is welded at the end of the diagonal brace, and the first sleeve and the top of the steel pipe pile are fixed by threads; an upper sleeve is provided at the bottom of the base plate, and a lower sleeve is symmetrically provided on the pedestal, and a vertical brace is fixed between the upper sleeve and the lower sleeve; tie channel steels are provided between the diagonal brace and the steel pipe pile, between the vertical brace and the steel pipe pile, and between the vertical brace and the pier.

[0008] Preferably, a concrete square column is arranged between the cast-in-place box girder and the pedestal to form the first temporary consolidation of the pier and beam, and the concrete square column is embedded with fine-rolled threaded steel bars. The bottom end of the main reinforcement of the concrete square column is anchored in the pedestal, and the top end is anchored in the web of the cast-in-place box girder. The contact surfaces of the concrete square column, the pedestal and the cast-in-place box girder are all formed with reserved grooves to facilitate the subsequent cutting of the concrete square column. Adjacent concrete square columns are connected in pairs by tie channel steels. A temporary support is arranged between the cap beam and the cast-in-place box girder, and the bottom end of the main reinforcement of the temporary support is anchored in the pier, and the top end is anchored in the web of the cast-in-place box girder to form the second temporary consolidation.

[0009] Preferably, the column-attached integrated operating platform comprises a pressure plate and an operating platform, a support rod is provided on one side of the pressure plate, a track is provided on the support rod, a guardrail is provided on the operating platform, and an adjustment block is provided between the guardrail and the support rod; the adjustment block moves in the track of the support rod, and a jack is provided at the bottom of the operating platform for adjusting the relative height of the guardrail; in addition, a lower U-shaped fixing part and an upper U-shaped fixing part are respectively provided on the same side of the pressure plate and the operating platform, and the lower U-shaped fixing part and the upper U-shaped fixing part are fixed by a telescopic rod; the support rod is anchored to the concrete square column through a fixing rod, a lifting ring is provided on the top of the guardrail, and positioning parts are provided on both sides of the pressure plate, and the positioning parts are welded to the tie channel steel.

[0010] Preferably, the removal device of the temporary support includes a bottom bracket, a first cross bar and a second cross bar, a fixing plate is provided on the upper part of the bottom bracket, a number of limit plates are evenly arranged on the fixing plate, the end of the first cross bar is anchored to the permanent support by bolts, a vertical scale bar is fixed on the first cross bar, a limit groove is provided on the vertical scale bar, an adjustment rod is provided in the limit groove; a connecting block is installed at the end of the second cross bar, the connecting block is placed in the limit groove of the vertical scale bar, the connecting block is connected to the adjustment rod, and the vertical scale bar is provided with a rotating knob for accurately adjusting the relative displacement of the second cross bar using the scale reading on the scale bar; a cutting groove is provided on the second cross bar, a cutting disc is installed in the cutting groove for cutting the temporary support.

[0011] The beneficial effects of the utility model are:

[0012] 1) The 0# block of the utility model adopts a steel pipe-channel steel combined bracket system. The clamping parts are pressed against the bridge pier by adjusting the rotating bolts. The relative position of the sliding plate is accurately adjusted by using the jack set between the connecting plate and the fixed frame. The relative position of the diagonal brace is adjusted by moving the slider, thereby forming a safe and stable adjustable steel pipe-channel steel combined bracket system.

[0013] 2) The utility model adopts a combined consolidation system of concrete square columns and temporary supports. Concrete square columns are arranged between the box beam and the pedestal to form the first temporary consolidation of the pier beam, and reserved grooves are arranged to facilitate the subsequent cutting of the concrete square columns. Tie channel steels are arranged between adjacent concrete square columns to enhance the stability of the structure. Temporary supports are arranged between the cap beam and the box beam to form the second temporary consolidation to ensure construction safety.

[0014] 3) The utility model is provided with an integrated column-attached cutting and dismantling operation platform, an adjustment block is provided between the guardrail and the support rod to strengthen the connection, and a jack is used to move the adjustment block within a predetermined track of the support rod, thereby adjusting the relative height of the guardrail; in addition, the lower pressure plate and the upper operation platform are respectively provided with U-shaped fixings to further ensure the safety of the integrated column-attached operation platform.

[0015] 4) The utility model evenly arranges a number of limit plates on the fixed plate to ensure that the first cross bar is subjected to stable force. The relative displacement of the second cross bar is accurately adjusted by turning the knob using the scale reading on the scale bar. The cutting disc is placed in the cutting groove of the second cross bar through the rope saw removal method for accurate cutting and removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the elevation layout of the temporary consolidation system of large-section, wide-width single-box multi-chamber cast-in-place box girder combination;

[0017] Figure 2 It is the elevation layout of the steel pipe-channel steel composite support system;

[0018] Figure 3 is a schematic diagram of the structure of the fixed frame;

[0019] Figure 4 It is the elevation layout of the concrete square column-temporary support combined consolidation system;

[0020] Figure 5 It is the side layout of the concrete square column-temporary support combined consolidation system;

[0021] Figure 6 It is the plan layout of the concrete square column-temporary support combined consolidation system;

[0022] Figure 7 It is the elevation layout of the integrated operating platform with attached columns;

[0023] Figure 8 It is a structural diagram of the integrated operating platform with attached columns;

[0024] Fig. 9 It is a structural schematic diagram of a temporary support removal device.

[0025] In the figure: 1-cap, 2-reserved groove, 3-concrete square column, 4-steel pipe pile, 5-tie channel steel, 6-box beam truss, 7-cast-in-place box beam, 8-fixed frame, 9-rotating bolt, 10-first sleeve, 11-cap beam, 12-diagonal brace, 13-upper sleeve, 14-pier, 15-vertical brace, 16-lower sleeve, 17-clamping piece, 18-connecting plate, 19-jack, 20-limiting groove, 21-connecting shaft, 22-sliding track, 23-bottom plate, 24-sliding groove, 25-sliding block, 26-sliding plate, 27-temporary support , 28-fine-rolled threaded steel, 29-permanent support, 30-attached column integrated operating platform, 31-fixed rod, 32-operating platform, 33-guardrail, 34-adjustment block, 35-support rod, 36-lifting ring, 37-upper U-shaped fixing, 38-telescopic rod, 39-lower U-shaped fixing, 40-positioning part, 41-pressure plate, 42-bottom bracket, 43-fixed plate, 44-limiting plate, 45-first cross bar, 46-cutting groove, 47-second cross bar, 48-connecting block, 49-scale rod, 50-adjustment rod, 51-knob. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for ordinary people in this technical field, the utility model can also be modified in some ways without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0027] Embodiment 1

[0028] As an example, Figures 1 to 9 As shown, a large-section wide-width single-box multi-chamber cast-in-place box girder combined temporary consolidation system, a bridge pier 14 is provided on the cap 1, a cap beam 11 is provided above the bridge pier 14, a cast-in-place box girder 7 is provided on the cap beam 11; a concrete square column 3 is temporarily provided between the cast-in-place box girder 7 and the cap 1, a temporary support 27 is provided between the cap beam 11 and the cast-in-place box girder 7, and a permanent support 29 is provided on the cap beam 11 between the temporary supports 27; there is also a removal device for the temporary support 27;

[0029] A fixing frame 8 is fixed at the end of the pier 14, and sliding plates 26 are slidably provided on both sides of the fixing frame 8. A diagonal brace 12 is slidably provided on the sliding plate 26. The other end of the diagonal brace 12 is connected to a steel pipe pile 4. The bottom of the steel pipe pile 4 is driven into the soil layer to form a steel pipe-channel steel combined support system;

[0030] The concrete square column 3 is fixedly connected with an integrated operating platform 30 attached to the column, and an operating platform 32 is supported on a pressure plate 41 of the integrated operating platform 30 attached to the column via a jack 19 .

[0031] The column-attached integrated operating platform 30 includes a pressure plate 41 and an operating platform 32. A support rod 35 is provided on one side of the pressure plate 41, and a track is provided on the support rod 35. A guardrail 33 is provided on the operating platform 32, and an adjustment block 34 is provided between the guardrail 33 and the support rod 35; the adjustment block 34 moves in the track of the support rod 35, and a jack 19 is provided at the bottom of the operating platform 32 for adjusting the relative height of the guardrail 33; in addition, a lower U-shaped fixing part 39 and an upper U-shaped fixing part 37 are respectively provided on the same side of the pressure plate 41 and the operating platform 32, and the lower U-shaped fixing part 39 and the upper U-shaped fixing part 37 are fixed by a telescopic rod 38; the support rod 35 is anchored on the concrete square column 3 through the fixing rod 31, a lifting ring 36 is provided on the top of the guardrail 33, and positioning parts 40 are provided on both sides of the pressure plate 41, and the positioning parts 40 are welded to the tie channel steel 5.

[0032] The removal device of the temporary support 27 includes a bottom bracket 42, a first cross bar 45 and a second cross bar 47. A fixing plate 43 is arranged on the upper part of the bottom bracket 42, and a plurality of limit plates 44 are evenly arranged on the fixing plate 43. The end of the first cross bar 45 is anchored to the permanent support 29 by bolts. A vertical scale rod 49 is fixed on the first cross bar 45, and a limit groove is provided on the vertical scale rod 49, and an adjusting rod 50 is arranged in the limit groove; a connecting block 48 is installed at the end of the second cross bar 47, and the connecting block 48 is placed in the limit groove of the vertical scale rod 49. The connecting block 48 is connected to the adjusting rod 50. Using the scale reading on the scale rod 49, a rotating knob 51 for accurately adjusting the relative displacement of the second cross bar 47 is provided on the vertical scale rod 49; a cutting groove 46 is provided on the second cross bar 47, and a cutting disc is installed in the cutting groove 46 for cutting the temporary support 27.

[0033] Embodiment 2

[0034] As another embodiment, the second embodiment proposes, on the basis of the first embodiment, a more specific large-section wide single-box multi-chamber cast-in-place box girder combined temporary consolidation system, including a cap 1, a reserved groove 2, a concrete square column 3, a steel pipe pile 4, a tie channel steel 5, a box girder truss 6, a cast-in-place box girder 7, a fixing frame 8, a rotating bolt 9, a first sleeve 10, a cap beam 11, a diagonal brace 12, an upper sleeve 13, a pier 14, a vertical brace 15, a lower sleeve 16, a clamp 17, a connecting plate 18, a jack 19, a limit groove 20, a connecting shaft 21, a sliding track 22, and a bottom plate 2 3. Sliding groove 24, sliding block 25, sliding plate 26, temporary support 27, fine-rolled threaded steel 28, permanent support 29, integrated operation platform with attached column 30, fixing rod 31, operation platform 32, guardrail 33, adjustment block 34, support rod 35, lifting ring 36, upper U-shaped fixing part 37, telescopic rod 38, lower U-shaped fixing part 39, positioning part 40, pressure plate 41, bottom bracket 42, fixing plate 43, limiting plate 44, first cross bar 45, cutting groove 46, second cross bar 47, connecting block 48, scale rod 49, adjustment rod 50, knob 51;

[0035] The large-section, wide-width, single-box, multi-chamber cast-in-place box girder combined temporary consolidation system involves the use of a steel pipe-channel steel combined support system for the 0# block, a concrete square column-temporary support combined consolidation system, an integrated column cutting and removal operation platform, and precise removal technology for temporary supports.

[0036] The 0# block adopts a steel pipe-channel steel combined support system, the fixed frame 8 is placed at the end of the pier 14, and rotating bolts 9 connected to the clamping piece 17 are arranged on both the front and rear sides of the fixed frame 8, and the clamping piece 17 is pressed against the pier 14 by adjusting the rotating bolts 9; two limiting grooves 20 are respectively provided on the left and right sides of the fixed frame 8, and a bottom plate 23 extends below the limiting groove 20, and a sliding track 22 is provided on the bottom plate 23; a sliding plate 26 is inserted into the limiting groove 20, and the bottom of the sliding plate 26 is placed in the sliding track 22 of the bottom plate 23, and the two sliding plates 26 on the same side are connected in the fixed frame 8 by a connecting plate 18, and a jack 19 is arranged between the connecting plate 18 and the inner wall of the fixed frame 8, and a sliding groove 24 is provided on the sliding plate 26 The diagonal brace 12 passes through the connecting shaft 21, and sliders 25 are arranged at both ends of the connecting shaft 21. The sliders 25 are placed in the sliding grooves 24 of the sliding plates 26, and the relative position of the diagonal brace 12 is adjusted by moving the sliders 25; the first sleeve 10 welded to the top of the steel pipe pile 4 and the end of the diagonal brace 12 is fixed by threads, and the bottom of the steel pipe pile 4 is driven into the soil layer with a depth of about 12 meters; an upper sleeve 13 is arranged at the bottom of the bottom plate 23, and a lower sleeve 16 is symmetrically arranged on the pedestal 1, and the vertical brace 15 is respectively connected and fixed with the upper and lower sleeves by tightening threads; tie channel steels 5 are arranged between the diagonal brace 12 and the steel pipe pile 4, between the vertical brace 15 and the steel pipe pile 4, and between the vertical brace 15 and the bridge pier 14, to enhance the safety and stability of the steel pipe-channel steel combined support system.

[0037] A concrete square column-temporary support combined consolidation system, wherein the cast-in-place box girder 7 and the pedestal 1 are provided with concrete square columns 3 to form the first temporary consolidation of the pier and beam, the concrete square columns 3 are embedded with fine-rolled threaded steel bars 28, the bottom end of the main reinforcement of the square column section is anchored in the pedestal 1, and the top end is anchored in the web of the cast-in-place box girder 7, and the contact surfaces with the pedestal 1 and the cast-in-place box girder 7 are formed with reserved grooves 2 to facilitate the subsequent cutting of the concrete square columns 3, and the adjacent concrete square columns 3 are paired by providing tie channel steels 5 to strengthen the stability of the structure; a temporary support 27 is provided between the cap beam 11 and the cast-in-place box girder 7, the bottom end of the main reinforcement is anchored in the pier 14, and the top end is anchored in the web of the cast-in-place box girder 7 to form the second temporary consolidation.

[0038] The integrated cutting and dismantling operation platform of the attached column, after the ground assembly of the integrated operation platform 30 of the attached column is completed, it is hoisted by using the lifting ring 36, and the fixing rod 31 is anchored on the concrete square column 3, and the positioning piece 40 is welded to the tie channel steel 5, so as to form a safe operation platform; the integrated operation platform 30 of the attached column is composed of a lower pressure plate 41 and an upper operation platform 32, and the lower pressure plate 41 is provided with a support rod 35, and an adjustment block 34 is arranged between the guardrail 33 on the operation platform 32 and the support rod 35 to strengthen the connection; the adjustment block 34 is moved within the predetermined track of the support rod 35 by using the jack 19, so as to adjust the relative height of the guardrail 33; in addition, the lower pressure plate 41 and the upper operation platform 32 are respectively anchored by bolts, and are provided with a lower U-shaped fixing piece 39 and an upper U-shaped fixing piece 37, and a height-adjustable telescopic rod 38 is arranged in the middle, so as to further ensure the safety of the integrated operation platform 30 of the attached column.

[0039] Precise removal technology for temporary supports, a fixing plate 43 is provided on the upper part of the bottom bracket 42, a number of limit plates 44 are evenly arranged on the fixing plate 43 to ensure that the first cross bar 45 is subjected to stable force, and the end of the first cross bar 45 is anchored to the permanent support 29 by bolts; the connecting block 48 installed on the second cross bar 47 is placed in the limit groove of the vertical scale rod 49, the connecting block 48 is connected to the adjusting rod 50, and the relative displacement of the second cross bar 47 is accurately adjusted by turning the knob 51 using the scale reading on the scale rod 49; when the position of the second cross bar 47 is determined, the cutting disc is placed in the cutting groove 46 of the second cross bar 47 by the rope saw removal method for precise cutting and removal.

[0040] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A large-section, wide-width, single-box, multi-chamber cast-in-place box girder combined temporary consolidation system, characterized in that: There are bridge piers on the cap, cap beams on the piers, and cast-in-place box beams on the cap beams; concrete square columns are temporarily arranged between the cast-in-place box beams and the cap, temporary supports are arranged between the cap beams and the cast-in-place box beams, and permanent supports are arranged on the cap beams between the temporary supports; there are also devices for removing temporary supports; A fixed frame is fixed at the end of the pier, and sliding plates are slidably provided on both sides of the fixed frame. Diagonal braces are slidably provided on the sliding plates, and the other end of the diagonal braces is connected to steel pipe piles. The bottom of the steel pipe piles is driven into the soil layer to form a steel pipe-channel steel combined support system; The concrete square column is fixedly connected with an integrated operating platform attached to the column, and the operating platform is supported on a pressure plate of the integrated operating platform attached to the column through a jack.

2. The large-section, wide-width single-box, multi-chamber cast-in-place box girder combined temporary consolidation system according to claim 1 is characterized in that: The fixing frame is placed at the end of the pier, and rotating bolts connected with clamping pieces are arranged on the front and rear sides of the fixing frame, and the rotating bolts are used to adjust the clamping pieces to press against the pier; two limiting grooves are respectively provided on the left and right sides of the fixing frame, and a bottom plate is extended below the limiting groove, and a sliding track is provided on the bottom plate; a sliding plate is inserted in the limiting groove, and the bottom of the sliding plate is placed in the sliding track of the bottom plate, and the two sliding plates on the same side are connected by a connecting plate in the fixing frame, and a jack is arranged between the connecting plate and the inner wall of the fixing frame, and the sliding plate is provided with a jack. A sliding groove is provided on the movable plate, a connecting shaft is passed through the end of the diagonal brace, and sliders are provided at both ends of the connecting shaft. The sliders are placed in the sliding groove of the sliding plate, and the relative position of the diagonal brace is adjusted by moving the sliders; a first sleeve is welded at the end of the diagonal brace, and the first sleeve and the top of the steel pipe pile are fixed by threads; an upper sleeve is provided at the bottom of the base plate, and a lower sleeve is symmetrically provided on the pedestal, and a vertical brace is fixed between the upper sleeve and the lower sleeve; tie channel steels are provided between the diagonal brace and the steel pipe pile, between the vertical brace and the steel pipe pile, and between the vertical brace and the pier.

3. The large-section, wide-width single-box multi-chamber cast-in-place box girder combined temporary consolidation system according to claim 1 is characterized in that: A concrete square column is arranged between the cast-in-place box girder and the pedestal to form the first temporary consolidation of the pier and beam. The concrete square column is embedded with fine-rolled threaded steel. The bottom end of the main reinforcement of the concrete square column is anchored in the pedestal, and the top end is anchored in the web of the cast-in-place box girder. The contact surfaces of the concrete square column, the pedestal and the cast-in-place box girder are all formed with reserved grooves to facilitate the subsequent cutting of the concrete square column. Adjacent concrete square columns are connected in pairs by tie channel steels. A temporary support is arranged between the cap beam and the cast-in-place box girder. The bottom end of the main reinforcement of the temporary support is anchored in the pier, and the top end is anchored in the web of the cast-in-place box girder to form the second temporary consolidation.

4. The large-section, wide-width single-box, multi-chamber cast-in-place box girder combined temporary consolidation system according to claim 3 is characterized in that: The column-attached integrated operating platform includes a pressure plate and an operating platform. A support rod is provided on one side of the pressure plate, a track is provided on the support rod, a guardrail is provided on the operating platform, and an adjustment block is provided between the guardrail and the support rod; the adjustment block moves in the track of the support rod, and a jack is provided at the bottom of the operating platform to adjust the relative height of the guardrail; in addition, a lower U-shaped fixing part and an upper U-shaped fixing part are respectively provided on the same side of the pressure plate and the operating platform, and the lower U-shaped fixing part and the upper U-shaped fixing part are fixed by a telescopic rod; the support rod is anchored to the concrete square column through a fixing rod, a lifting ring is provided on the top of the guardrail, and positioning parts are provided on both sides of the pressure plate, and the positioning parts are welded to the tie channel steel.

5. The large-section, wide-width single-box, multi-chamber cast-in-place box girder combined temporary consolidation system according to claim 1 is characterized in that: The removal device of the temporary support includes a bottom bracket, a first cross bar and a second cross bar. A fixing plate is arranged on the upper part of the bottom bracket, and a plurality of limit plates are evenly arranged on the fixing plate. The end of the first cross bar is anchored to the permanent support by bolts. A vertical scale bar is fixed on the first cross bar, and a limit groove is provided on the vertical scale bar, and an adjustment rod is arranged in the limit groove; a connecting block is installed at the end of the second cross bar, and the connecting block is placed in the limit groove of the vertical scale bar. The connecting block is connected to the adjustment rod, and the vertical scale bar is provided with a rotating knob for accurately adjusting the relative displacement of the second cross bar using the scale reading on the scale bar; a cutting groove is provided on the second cross bar, and a cutting disc is installed in the cutting groove for cutting the temporary support.

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