Auxiliary positioning tool for welding steel-concrete civil air defense door frame fixing shaft

Abstract

The utility model provides an auxiliary positioning tool for welding fixed shafts of a steel-concrete civil air defense door frame, which comprises a positioning frame, a plurality of positioning shaft sleeves, longitudinal positioning pieces and transverse positioning pieces, the positioning shaft sleeves are vertically arranged at four corners of the positioning frame respectively and correspond to the welding positions of the fixed shafts on the steel-concrete civil air defense door frame, and the longitudinal positioning pieces and the transverse positioning pieces are arranged on the positioning frame. The longitudinal positioning piece is arranged at one end of the positioning frame and can be correspondingly clamped at the top end or the tail end of the steel-concrete civil air defense door frame so as to longitudinally limit the positioning frame, and the transverse positioning piece is arranged on one side of the positioning frame and can be clamped at the tail end of the steel-concrete civil air defense door frame so as to longitudinally limit the positioning frame. The positioning frame is arranged at the upper end of the steel-concrete civil air defense door frame and can be correspondingly clamped at the side end of the steel-concrete civil air defense door frame to transversely limit the positioning frame, so that a preset distance is kept between the positioning frame and the side end of the steel-concrete civil air defense door frame, the positioning frame is kept upright at the upper end of the steel-concrete civil air defense door frame, positioning is convenient, it is guaranteed that all the fixing shafts do not deviate in the welding process, and the welding quality is improved. And the welding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel - concrete civil air defense door frame fixed - shaft welding, and particularly relates to an auxiliary positioning tooling for steel - concrete civil air defense door frame fixed - shaft welding. Background Technique

[0002] A steel - concrete civil air defense door is made by prefabricating a door leaf frame with steel plates and pouring corresponding - grade concrete in the door leaf frame. It is mainly used for installation at the connecting port of the civil air defense area in the underground garage and is an important protective device at each connecting port in the civil air defense project.

[0003] During the prefabrication process of the steel - concrete civil air defense door frame, four fixed shafts need to be welded at predetermined positions inside the door leaf frame. The function of the fixed shafts is to install the locking heads for opening and closing the steel - concrete civil air defense door. Currently, the welding work of the fixed shafts mainly adopts manual welding. When manually welding, each fixed shaft needs to be welded perpendicular to the door leaf frame, and a specified distance needs to be maintained between each fixed shaft and the edge of the door leaf frame so that the locking head can be smoothly assembled in the subsequent assembly process. Since manual welding requires manual measurement and positioning of each fixed shaft, the positioning is inconvenient, resulting in low welding efficiency. Moreover, during the welding process of the fixed shafts, they are prone to shift under the action of thermal stress. The shift of the fixed shafts will cause difficulties in the subsequent locking - head assembly process. Summary of the Utility Model

[0004] In view of this, it is necessary to provide an auxiliary positioning tooling for steel - concrete civil air defense door frame fixed - shaft welding to solve the technical problems of inconvenient positioning and easy shift during the welding process in the prior art.

[0005] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0006] An auxiliary positioning tooling for steel - concrete civil air defense door frame fixed - shaft welding includes a positioning frame detachably arranged on the steel - concrete civil air defense door frame, and a positioning bushing, a longitudinal positioning member, and a transverse positioning member arranged on the positioning frame for positioning the fixed shafts. The positioning bushings are multiple and are respectively vertically arranged at the four corners of the positioning frame. The distance between each positioning bushing is a preset distance, corresponding to the welding positions of each fixed shaft on the steel - concrete civil air defense door frame, and can be detachably sleeved on each fixed shaft to position each fixed shaft. The longitudinal positioning member is arranged at one end of the positioning frame and can be correspondingly clamped at the top or the end of the steel - concrete civil air defense door frame to longitudinally limit the positioning frame, so that a preset distance is maintained between the positioning frame and the top or the end of the steel - concrete civil air defense door frame. The transverse positioning member is arranged on one side of the positioning frame and can be correspondingly clamped at the side end of the steel - concrete civil air defense door frame to transversely limit the positioning frame, so that a preset distance is maintained between the positioning frame and the side end of the steel - concrete civil air defense door frame.

[0007] Preferably, the longitudinal positioning member includes a longitudinal positioning rod and a longitudinal fixing clamp. The longitudinal positioning rod is longitudinally arranged at one end of the positioning frame. The longitudinal fixing clamp is sleeved on the longitudinal positioning rod and can slide and lock along the length direction of the longitudinal positioning rod, and can be correspondingly clamped at the top or the end of the steel-concrete air defense door frame to limit the positioning frame, so that a preset distance is maintained between the positioning frame and the top or the end of the steel-concrete air defense door frame.

[0008] Preferably, the longitudinal fixing clamp includes a first C-shaped clamp, a first clamping plate, a first fixing handle, a first sliding sleeve and a first locking handle. The first C-shaped clamp is detachably clamped at the top or the end of the steel-concrete air defense door frame. The first clamping plate is arranged inside the first C-shaped clamp and is parallel to the side wall of the first C-shaped clamp. The first fixing handle is threadedly connected and arranged on the side wall of the first C-shaped clamp and passes through the side wall of the first C-shaped clamp to be rotatably connected with the first clamping plate. Rotating the first fixing handle can push the first clamping plate to move oppositely inside the first C-shaped clamp to clamp the top or the end of the steel-concrete air defense door frame. The first sliding sleeve is fixedly arranged at the upper end of the first C-shaped clamp. The first sliding sleeve is sleeved on the longitudinal positioning rod. The first C-shaped clamp can slide along the length direction of the longitudinal positioning rod through the first sliding sleeve. The first locking handle is threadedly connected and arranged on the first sliding sleeve and can penetrate into the first sliding sleeve to lock the longitudinal positioning rod, so that a preset distance is maintained between the positioning frame and the top or the end of the steel-concrete air defense door frame.

[0009] Preferably, there are two groups of transverse positioning members. Each group of transverse positioning members respectively includes a transverse positioning rod and a transverse fixing clamp. The transverse positioning rods of the two groups of transverse positioning members are arranged horizontally side by side on the same side of the positioning frame and are respectively close to both ends of the positioning frame. The transverse fixing clamps of the two groups of transverse positioning members are respectively sleeved on the corresponding transverse positioning rods and can slide and lock along the length direction of the transverse positioning rods respectively, and can be respectively clamped at the side ends of the steel-concrete air defense door frame to perform transverse limitation on the positioning frame, so that a preset distance is maintained between the positioning frame and the side ends of the steel-concrete air defense door frame and the side ends of the steel-concrete air defense door frame are kept parallel to each other.

[0010] Preferably, the transverse fixing fixture includes a second U-shaped clamp, a second clamping plate, a second fixing handle, a second sliding sleeve and a second locking handle. The second U-shaped clamp is detachably clamped on the side end of the steel-concrete air defense door frame. The second clamping plate is arranged inside the second U-shaped clamp and is parallel to the side wall of the second U-shaped clamp. The second fixing handle is threadedly connected and arranged on the side wall of the second U-shaped clamp and passes through the side wall of the second U-shaped clamp to be rotatably connected with the second clamping plate. Rotating the second fixing handle can push the second clamping plate to move oppositely inside the second U-shaped clamp to clamp the side end of the steel-concrete air defense door frame. The second sliding sleeve is fixedly arranged at the upper end of the second U-shaped clamp. The second sliding sleeve is sleeved on the corresponding transverse positioning rod. The second U-shaped clamp can slide along the length direction of the corresponding transverse positioning rod through the second sliding sleeve. The second locking handle is threadedly connected and arranged on the second sliding sleeve and can penetrate into the second sliding sleeve to lock the transverse positioning rod, so as to keep a preset distance between the positioning frame and the side end of the steel-concrete air defense door frame, and the transverse positioning rods of the two groups of transverse positioning members are in the same position as the corresponding second sliding sleeves, so that the positioning frame and the side end of the steel-concrete air defense door frame can be kept parallel to each other.

[0011] Preferably, a scale is arranged along the length direction of the longitudinal positioning rod.

[0012] Preferably, a scale is arranged along the length direction of the transverse positioning rod.

[0013] Preferably, an auxiliary bracket is further arranged on the positioning frame. The auxiliary bracket is horizontally arranged on the side of the positioning frame away from the transverse positioning rod and can rest on the edge of the other side end of the steel-concrete air defense door frame. And the lower surface of the auxiliary bracket in contact with the steel-concrete air defense door frame is at the same height as the end surface of the second U-shaped clamp in contact with the steel-concrete air defense door frame, so that the positioning frame can be kept parallel on the steel-concrete air defense door frame.

[0014] It can be seen from the above technical solutions that the auxiliary positioning tooling for welding the fixed shafts of the steel-concrete air defense door frame provided by the present application includes a positioning frame, positioning shaft sleeves, longitudinal positioning members and transverse positioning members. There are multiple positioning shaft sleeves, which are respectively vertically arranged at the four corners of the positioning frame and can be detachably sleeved on each fixed shaft to position each fixed shaft. The longitudinal positioning members are arranged at one end of the positioning frame and are clamped between the top end or the tail end of the steel-concrete air defense door frame to longitudinally limit the positioning frame. The transverse positioning members are arranged on one side of the positioning frame and are clamped between the side ends of the steel-concrete air defense door frame to transversely limit the positioning frame. Through the longitudinal positioning members and the transverse positioning members, the positioning frame can be kept upright at the upper end of the steel-concrete air defense door frame and a preset distance can be kept between the positioning frame and the side end and the top end of the steel-concrete air defense door frame, thereby playing a role in positioning each fixed shaft, ensuring that the positions of the fixed shafts do not shift during the welding process. And four fixed shafts can be positioned simultaneously, which is convenient for positioning and improves the welding efficiency. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of this utility model.

[0016] Figure 2 It is a schematic diagram of the usage state of this utility model.

[0017] Figure 3 It is Figure 1 a partial enlarged schematic diagram of part A in

[0018] Figure 4 It is Figure 1 a partial enlarged schematic diagram of part B in

[0019] In the figure: steel-concrete civil air defense door frame 1, fixed shaft 2, positioning frame 3, positioning shaft sleeve 4, longitudinal positioning member 5, transverse positioning member 6, longitudinal positioning rod 51, longitudinal fixing clamp 52, first C-shaped clamp 521, first clamping plate 522, first fixing handle 523, first sliding sleeve 524, first locking handle 525, transverse positioning rod 61, transverse fixing clamp 62, second C-shaped clamp 621, second clamping plate 622, second fixing handle 623, second sliding sleeve 624, second locking handle 625, scale 7, auxiliary support 8. Specific embodiments

[0020] In order to more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of this utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Please refer to Figures 1 to 2, an embodiment of the present utility model provides an auxiliary positioning tool for welding a fixed shaft of a steel-concrete civil air defense door frame, which is used to assist in positioning the fixed shaft 2 on the steel-concrete civil air defense door frame 1 so as to facilitate manual welding thereof. The auxiliary positioning tool for welding the fixed shaft of the steel-concrete civil air defense door frame includes a positioning frame 3, and a positioning bushing 4, a longitudinal positioning member 5 and a transverse positioning member 6 provided on the positioning frame 3 for positioning the fixed shaft 2. The positioning frame 3 is a rectangular frame arranged in parallel. There are multiple positioning bushings 4, which are respectively vertically arranged at the four corners of the positioning frame 3. The distance between each positioning bushing 4 is a preset distance, corresponding to the welding positions of each fixed shaft 2 to be welded on the steel-concrete civil air defense door frame 1. The inner diameter of the positioning bushing 4 matches the outer diameter of the fixed shaft 2. Each positioning bushing 4 can be correspondingly sleeved on each fixed shaft 2 and can be disassembled to position each fixed shaft 2. The longitudinal positioning member 5 is arranged at one end in the length direction of the positioning frame 3 and can be correspondingly clamped at the top or the end in the length direction of the steel-concrete civil air defense door frame 1 for longitudinally limiting the positioning frame 3. The transverse positioning member 6 is arranged on one side in the width direction of the positioning frame 3 and can be correspondingly clamped at the side end of the steel-concrete civil air defense door frame 1 for transversely limiting the positioning frame 3. When welding the fixed shaft 2, the steel-concrete civil air defense door frame 1 is placed in parallel, and each fixed shaft 2 is vertically placed at the welding position in the steel-concrete civil air defense door frame 1. The positioning frame 3 is placed in parallel directly above the steel-concrete civil air defense door frame 1, and each positioning bushing 4 is correspondingly sleeved on the upper end of each fixed shaft 2. The longitudinal positioning member 5 is clamped at the top or the end of the steel-concrete civil air defense door frame 1 to longitudinally limit the positioning frame 3, so that a preset distance is maintained between the positioning frame 3 and the top or the end of the steel-concrete civil air defense door frame 1. The transverse positioning member 6 is clamped at the side end of the steel-concrete civil air defense door frame 1, so that a preset distance is maintained between the positioning frame 3 and the side end of the steel-concrete civil air defense door frame 1, so that the positioning frame 3 is kept upright above the steel-concrete civil air defense door frame 1. Each fixed shaft 2 is positioned through the positioning bushing 4 on the positioning frame 3 to prevent the position of each fixed shaft 2 from shifting during the welding process.

[0022] Please refer to Figures 1 to 3, in this embodiment, both the longitudinal positioning member 5 and the transverse positioning member 6 can be adjusted. The position of the positioning frame 3 can be adjusted according to the length and width of the steel-concrete civil air defense door frame 1. Specifically, the longitudinal positioning member 5 includes a longitudinal positioning rod 51 and a longitudinal fixing clamp 52. The longitudinal positioning rod 51 is longitudinally arranged at one end of the positioning frame 3 in the length direction. The longitudinal fixing clamp 52 is sleeved on the longitudinal positioning rod 51 and can slide and lock along the length direction of the longitudinal positioning rod 51 to adjust the distance between the longitudinal fixing clamp 52 and the end of the positioning frame 3. The longitudinal fixing clamp 52 includes a first C-shaped clamp 521, a first clamping plate 522, a first fixing handle 523, a first sliding sleeve 524 and a first locking handle 525. The first C-shaped clamp 521 has an opening facing downwards and can be detachably clamped on the edge of the top or the end of the steel-concrete civil air defense door frame 1. The first clamping plate 522 is arranged inside the first C-shaped clamp 521 and is parallel to the side wall of the first C-shaped clamp 521. The first fixing handle 523 is threadedly connected and arranged on the outer side wall of the first C-shaped clamp 521 and passes through the outer side wall of the first C-shaped clamp 521 to be rotatably connected to the first clamping plate 522. By manually rotating the first fixing handle 523, the first clamping plate 522 can be pushed to make the first clamping plate 522 move towards the inner side wall of the first C-shaped clamp 521 inside the first C-shaped clamp 521. The two sides of the edge of the top or the end of the steel-concrete civil air defense door frame 1 are clamped towards each other by the first clamping plate 522 and the inner side wall of the first C-shaped clamp 521 to fix the first C-shaped clamp 521. The first sliding sleeve 524 is fixedly arranged at the upper end of the first C-shaped clamp 521. The longitudinal positioning rod 51 passes through the first sliding sleeve 524. The first C-shaped clamp 521 can slide along the length direction of the longitudinal positioning rod 51 through the first sliding sleeve 524 to adjust the distance between the first C-shaped clamp 521 and the positioning frame 3. The first locking handle 525 is threadedly connected and arranged on the first sliding sleeve 524 and is perpendicular to the longitudinal positioning rod 51. By manually rotating the first locking handle 525, it can penetrate into the first sliding sleeve 524 and abut against the longitudinal positioning rod 51 to lock the longitudinal positioning rod 51 in the first sliding sleeve 524. By adjusting the position of the first sliding sleeve 524 on the longitudinal positioning rod 51, the distance between the first C-shaped clamp 521 and the positioning frame 3 can be controlled, and further the distance between the positioning frame 3 and the edge of the top or the end of the steel-concrete civil air defense door frame 1 can be controlled.

[0023] Please refer to Figure 1 , Figure 2 and Figure 4, in this embodiment, there are two sets of the lateral positioning members 6, which are arranged horizontally side by side on the same side in the width direction of the positioning frame 3. Each set of the lateral positioning members 6 respectively includes a lateral positioning rod 61 and a lateral fixing clamp 62. The lateral positioning rods 61 of the two sets of the lateral positioning members 6 are arranged horizontally side by side on the same side of the positioning frame 3 and are respectively close to both ends of the positioning frame 3. The lateral fixing clamps 62 of the two sets of the lateral positioning members 6 are respectively sleeved on the corresponding lateral positioning rods 61. Each lateral fixing clamp 62 respectively includes a second C-shaped clamp 621, a second clamping plate 622, a second fixing handle 623, a second sliding sleeve 624 and a second locking handle 625. The second C-shaped clamp 621 is detachably clamped on the side end of the steel-concrete air defense door frame 1. The second clamping plate 622 is arranged in the second C-shaped clamp 621 and is parallel to the side wall of the second C-shaped clamp 621. The second fixing handle 623 is threadedly connected and arranged on the side wall of the second C-shaped clamp 621 and passes through the side wall of the second C-shaped clamp 621 to be rotatably connected with the second clamping plate 622. Rotating the second fixing handle 623 can push the second clamping plate 622 to move oppositely in the second C-shaped clamp 621. By manually rotating the second fixing handle 623, the second clamping plate 622 can be pushed to move oppositely in the second C-shaped clamp 621 and the inner side wall of the second C-shaped clamp 621. The side end edge of the steel-concrete air defense door frame 1 is clamped by the second clamping plate 622 and the inner side wall of the second C-shaped clamp 621. The second sliding sleeve 624 is fixedly arranged at the upper end of the second C-shaped clamp 621. The second sliding sleeve 624 is sleeved on the corresponding lateral positioning rod 61. The second C-shaped clamp 621 can slide along the length direction of the corresponding lateral positioning rod 61 through the second sliding sleeve 624. The second locking handle 625 is threadedly connected and arranged on the second sliding sleeve 624. By manually rotating the second locking handle 625, it can penetrate into the second sliding sleeve 624 and abut against the lateral positioning rod 61 to lock the lateral positioning rod 61 in the second sliding sleeve 624. By adjusting the position of the second sliding sleeve 624 on the lateral positioning rod 61, the distance between the second C-shaped clamp 621 and the positioning frame 3 can be controlled, and further the distance between the positioning frame 3 and the side end edge of the steel-concrete air defense door frame 1 can be controlled. Moreover, by adjusting the distances between the second C-shaped clamps 621 and the positioning frame 3 on the two sets of the lateral positioning members 6 to make the distances between the second C-shaped clamps 621 and the positioning frame 3 on the two sets of the lateral positioning members 6 consistent, the side ends of the positioning frame 3 and the steel-concrete air defense door frame 1 can be kept parallel to each other, and thus the uprightness of the positioning frame 3 is ensured.

[0024] Please continue to refer to Figure 1 or Figure 2, for the convenience of installing and positioning the positioning frame 3, a scale 7 is provided on the longitudinal positioning rod 51 along its length direction, and a scale 7 is also provided on the transverse positioning rod 61 along its length direction. This facilitates workers to proofread and adjust the distances between the positioning frame 3 and the side end and top end of the steel-concrete air defense door frame 1 when installing the positioning frame 3, thus improving the working efficiency of installing the positioning frame 3.

[0025] Please continue to refer to Figure 2 , further, an auxiliary support 8 is also provided on the positioning frame 3. The auxiliary support 8 is horizontally arranged on the side of the positioning frame 3 away from the transverse positioning rod 61. The auxiliary support 8 extends parallel to the outside of the positioning frame 3 and can rest on the edge of the opposite side end of the steel-concrete air defense door frame 1. And the lower surface of the auxiliary support 8 in contact with the steel-concrete air defense door frame 1 and the end face of the second C-shaped clamp 621 in contact with the steel-concrete air defense door frame 1 are at the same height, so that the positioning frame 3 remains parallel on the steel-concrete air defense door frame 1.

[0026] When this auxiliary positioning tooling is specifically used, the steel-concrete air defense door frame 1 is placed in parallel. The positioning frame 3 is placed parallel on the upper end of the steel-concrete air defense door frame 1, and each positioning bushing 4 is respectively sleeved on the upper end of each fixed shaft 2 to be welded. The positioning bushing 4 is used to position each fixed shaft 2, so that each fixed shaft 2 remains vertical in the concrete air defense door frame. The first C-shaped clamp 521 on the longitudinal positioning member 5 is clamped on the top or tail end edge of the steel-concrete air defense door frame 1, and the second C-shaped clamps 621 on the two groups of transverse positioning members 6 are clamped on the side end edge of the steel-concrete air defense door frame 1. After adjusting and determining the distances between the positioning frame 3 and the side end and top end of the steel-concrete air defense door frame 1, the first C-shaped clamp 521 and the second C-shaped clamp 621 are locked on the side end and top end edges of the steel-concrete air defense door frame 1 by manually rotating the first fixing handle 523 and the second fixing handle 623 respectively, and the longitudinal positioning rod 51 and the transverse positioning rod 61 are locked by manually rotating the first locking handle 525 and the second locking handle 625 respectively. In this way, the fixing of the positioning frame 3 is completed, and the positioning frame 3 remains upright on the upper end of the steel-concrete air defense door frame 1, thereby playing a role in positioning each fixed shaft 2 and ensuring that the positions of each fixed shaft 2 do not shift during the welding process. Moreover, this auxiliary positioning tooling is convenient for positioning and can position four fixed shafts 2 at the same time, improving the welding efficiency.

[0027] What is disclosed above is only the preferred embodiment of the present invention. Of course, the scope of the rights of the present invention cannot be limited by this. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An auxiliary positioning tool for welding the fixed axis of a steel-concrete civil air defense door frame, characterized in that: It includes a positioning frame detachably arranged on the steel-concrete civil air defense door frame, and a positioning bushing, a longitudinal positioning member, and a transverse positioning member arranged on the positioning frame for positioning a fixed shaft. There are multiple positioning bushings, which are respectively vertically arranged at the four corners of the positioning frame. The distance between each positioning bushing is a preset distance, corresponding to the welding positions of each fixed shaft on the steel-concrete civil air defense door frame, and can be detachably sleeved on each fixed shaft to position each fixed shaft. The longitudinal positioning member is arranged at one end of the positioning frame and can be correspondingly clamped at the top or the end of the steel-concrete civil air defense door frame to longitudinally limit the positioning frame, so that a preset distance is maintained between the positioning frame and the top or the end of the steel-concrete civil air defense door frame. The transverse positioning member is arranged on one side of the positioning frame and can be correspondingly clamped at the side end of the steel-concrete civil air defense door frame to transversely limit the positioning frame, so that a preset distance is maintained between the positioning frame and the side end of the steel-concrete civil air defense door frame.

2. The auxiliary positioning tool for welding the fixed axis of the steel-concrete civil air defense door frame according to claim 1, characterized in that: The longitudinal positioning member includes a longitudinal positioning rod and a longitudinal fixing clamp. The longitudinal positioning rod is longitudinally arranged at one end of the positioning frame. The longitudinal fixing clamp is sleeved on the longitudinal positioning rod and can slide and lock along the length direction of the longitudinal positioning rod, and can be correspondingly clamped at the top or the end of the steel-concrete civil air defense door frame to limit the positioning frame, so that a preset distance is maintained between the positioning frame and the top or the end of the steel-concrete civil air defense door frame.

3. The auxiliary positioning tool for welding the fixed axis of the steel-concrete civil air defense door frame according to claim 2, characterized in that: The longitudinal fixing clamp includes a first U-shaped clamp, a first clamping plate, a first fixing handle, a first sliding sleeve, and a first locking handle. The first U-shaped clamp can be detachably clamped at the top or the end of the steel-concrete civil air defense door frame. The first clamping plate is arranged inside the first U-shaped clamp and is parallel to the side wall of the first U-shaped clamp. The first fixing handle is threadedly connected and arranged on the side wall of the first U-shaped clamp and passes through the side wall of the first U-shaped clamp to be rotatably connected to the first clamping plate. Rotating the first fixing handle can push the first clamping plate to move oppositely inside the first U-shaped clamp to clamp the top or the end of the steel-concrete civil air defense door frame. The first sliding sleeve is fixedly arranged at the upper end of the first U-shaped clamp. The first sliding sleeve is sleeved on the longitudinal positioning rod. The first U-shaped clamp can slide along the length direction of the longitudinal positioning rod through the first sliding sleeve. The first locking handle is threadedly connected and arranged on the first sliding sleeve and can penetrate into the first sliding sleeve to lock the longitudinal positioning rod, so that a preset distance is maintained between the positioning frame and the top or the end of the steel-concrete civil air defense door frame.

4. The auxiliary positioning tool for welding the fixed axis of the steel-concrete civil air defense door frame according to claim 1, characterized in that: There are two groups of transverse positioning members. Each group of transverse positioning members respectively includes a transverse positioning rod and a transverse fixing clamp. The transverse positioning rods of the two groups of transverse positioning members are arranged side by side horizontally on the same side of the positioning frame and are respectively close to both ends of the positioning frame. The transverse fixing clamps of the two groups of transverse positioning members are respectively sleeved on the corresponding transverse positioning rods and can respectively slide and lock along the length direction of the transverse positioning rods, and can respectively be correspondingly clamped at the side end of the steel-concrete civil air defense door frame to transversely limit the positioning frame, so that a preset distance is maintained between the positioning frame and the side end of the steel-concrete civil air defense door frame and is parallel to the side end of the steel-concrete civil air defense door frame.

5. The auxiliary positioning tool for welding the fixed axis of the steel-concrete civil air defense door frame according to claim 4, characterized in that: The horizontal fixing fixture includes a second C-shaped clamp, a second clamping plate, a second fixing handle, a second sliding sleeve and a second locking handle. The second C-shaped clamp is detachably clamped on the side end of the steel-concrete air defense door frame. The second clamping plate is arranged in the second C-shaped clamp and is parallel to the side wall of the second C-shaped clamp. The second fixing handle is threadedly connected to the side wall of the second C-shaped clamp and passes through the side wall of the second C-shaped clamp to be rotatably connected to the second clamping plate. Rotating the second fixing handle can push the second clamping plate to move oppositely in the second C-shaped clamp to clamp the side end of the steel-concrete air defense door frame. The second sliding sleeve is fixedly arranged at the upper end of the second C-shaped clamp. The second sliding sleeve is sleeved on the corresponding horizontal positioning rod. The second C-shaped clamp can slide along the length direction of the corresponding horizontal positioning rod through the second sliding sleeve. The second locking handle is threadedly connected to the second sliding sleeve and can penetrate into the second sliding sleeve to lock the horizontal positioning rod, so as to keep a preset distance between the positioning frame and the side end of the steel-concrete air defense door frame, and the horizontal positioning rods of the two groups of horizontal positioning members are in the same position as the corresponding second sliding sleeves, so that the positioning frame and the side end of the steel-concrete air defense door frame can be kept parallel to each other.

6. The auxiliary positioning tool for welding the fixed axis of the steel-concrete civil air defense door frame according to claim 3, characterized in that: A scale is arranged along the length direction of the longitudinal positioning rod.

7. The auxiliary positioning tool for welding the fixed axis of the steel-concrete civil air defense door frame according to claim 5, characterized in that: A scale is arranged along the length direction of the horizontal positioning rod.

8. The auxiliary positioning tool for welding the fixed axis of the steel-concrete civil air defense door frame according to claim 5, characterized in that: An auxiliary support is further arranged on the positioning frame. The auxiliary support is horizontally arranged on the side of the positioning frame away from the horizontal positioning rod and can rest on the edge of the other side end of the steel-concrete air defense door frame. And the lower surface of the auxiliary support in contact with the steel-concrete air defense door frame is at the same height as the end face of the second C-shaped clamp in contact with the steel-concrete air defense door frame, so that the positioning frame can be kept parallel on the steel-concrete air defense door frame.

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