Precast slab joint control device

Abstract

The utility model relates to the technical field of rail transit construction equipment, in particular to a precast slab joint control device which comprises a longitudinal beam, and the length of the longitudinal beam is arranged in the first direction. Indicating scales are arranged on the surface of the longitudinal beam in the first direction. The two limiting pins are distributed on the longitudinal beam at intervals in the first direction, and the length of the limiting pins is set in the second direction; the position of at least one limiting pin in the first direction is adjustable; the clamping jaw comprises a transverse section and a vertical section, the length of the transverse section is arranged in the third direction, and one end of the transverse section is connected with the longitudinal beam; the vertical section is connected to the end, away from the longitudinal beam, of the transverse section, and the length of the vertical section is arranged in the second direction. According to the utility model, the technical problems in the prior art that the positioning parameters of the precast slab are measured by using an encryption base mark and a steel plate ruler, but the steel plate ruler is low in measurement efficiency and the encryption base mark is difficult to set, so that the erection efficiency of the precast slab is low can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit construction equipment, and particularly relates to a precast slab joint control device. Background Art

[0002] In the existing subway construction, precast slabs need to be laid along the track length direction. Among them, the positioning parameters of the precast slabs, such as the direction of the precast slabs, the levelness of the precast slabs, and the joint width between two adjacent precast slabs, are key factors affecting the construction quality. Therefore, strict measurement and control are required. The existing technology generally uses the method of encrypted benchmarks + steel tape measures to measure and control the positioning parameters of the precast slabs. This method requires workers to hold the steel tape measure to repeatedly measure and adjust the positioning parameters of the precast slabs, which has the problems of large workload, low work efficiency, and inability to quickly determine the positioning parameters of the precast slabs. In the actual construction process, the initial erection of a precast slab takes more than 20 minutes, and the fine adjustment also takes more than 10 minutes, and the overall progress index is not ideal.

[0003] Moreover, after the subway enters the circular tunnel, the tunnel is filled with steel fiber fine aggregate concrete without a base, and the encrypted benchmarks can only be directly set on the pipe wall. Due to reasons such as the bolt hand holes on the pipe wall and the gaps between the segments, the encrypted benchmarks cannot be completely set at the end of the precast slab, which further increases the difficulty of measuring the positioning parameters of the precast slab. Especially in the case of line slope control and inconsistent joint sizes between the inner and outer side plates of the curve, the measurement and positioning efficiency of the precast slab will further decrease. Therefore, it is urgent to design a new tooling to improve the measurement and control efficiency of the positioning parameters of the precast slab. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the technical problems in the prior art that when using encrypted benchmarks and steel tape measures to measure the positioning parameters of precast slabs, the measurement efficiency of the steel tape measure is low, and the encrypted benchmarks are difficult to set, resulting in low erection efficiency of the precast slabs, and to provide a precast slab joint control device.

[0005] In a first aspect, the utility model provides a precast slab joint control device, including:

[0006] A longitudinal beam, the length of the longitudinal beam is set along a first direction; an indicating scale is arranged on the surface of the longitudinal beam along the first direction;

[0007] Limit pins, two limit pins are distributed on the longitudinal beam at intervals along the first direction, and the length of the limit pins is set along a second direction; the position of at least one limit pin along the first direction is adjustable;

[0008] A claw, the claw includes a transverse section and a vertical section, the length of the transverse section is set along a third direction, one end of the transverse section is connected to the longitudinal beam; the vertical section is connected to the end of the transverse section away from the longitudinal beam, and the length of the vertical section is set along the second direction;

[0009] The first direction, the second direction, and the third direction are perpendicular to each other pairwise.

[0010] For installing road studs or other components, embedded holes are provided on the precast slab, and the embedded holes have sufficient positioning accuracy to serve as a measurement reference; therefore, the precast slab joint control device in this solution measures the positioning parameters of the precast slab with the embedded holes in the precast slab as fixed reference points. For example:

[0011] When two adjacent precast slabs are in the designed installation positions, the distance between the corresponding embedded holes on the two adjacent precast slabs along the first direction is D0; when using the precast slab joint control device, the position of the limit pins along the first direction on the longitudinal beam can be adjusted first to make the distance between the two limit pins D1, and D1 matches D0; insert one of the limit pins into the embedded hole of the installed precast slab, and then adjust the position of the other precast slab until the other limit pin aligns with the embedded hole on the other precast slab, which indicates that the position of the precast slab along the first direction matches the designed installation position; at this time, raise the precast slab so that the two limit pins are respectively inserted into the embedded holes of the two precast slabs, and the distance between the two adjacent precast slabs along the first direction can be restricted by the longitudinal beam and the limit pins, ensuring that the joint width always meets the design requirements.

[0012] Compared with the prior art that requires separate installation of encrypted reference marks and repeated measurement with a hand-held steel ruler, this solution directly uses the embedded holes on the precast slab as the measurement reference, thus eliminating the installation operation of encrypted reference marks and avoiding the situation where measurement operations are difficult due to limited installation of encrypted reference marks; at the same time, in this solution, it can be directly judged whether the joint width between two adjacent precast slabs meets the design requirements by observing whether the limit pins can fall into the embedded holes, without the need for workers to repeatedly measure and read at various places on the precast slab with a hand-held steel ruler; and for areas with the same joint width for each slab, the same precast slab joint control device with the distance between the limit pins adjusted can be used for measurement without repeatedly adjusting the position of the limit pins, thus eliminating a large amount of repetitive labor; for areas with different joint widths, the position of the limit pins can be adjusted again according to the corresponding designed distance.

[0013] The clamping jaw can send the vertical section to the side of the precast slab through its horizontal section and abut against the side of the precast slab through its vertical section, thereby restricting the relative position between the longitudinal beam and the precast slab, ensuring that the length direction of the longitudinal beam matches the length direction of the precast slab, and the length direction of the limit pin matches the axis direction of the embedded hole, and avoiding the situation where the distance between the limit pins cannot be accurately corresponding to the joint width due to the deviation between the length direction of the longitudinal beam and the length direction of the precast slab.

[0014] Preferably, waist-shaped holes are provided on the longitudinal beam, the length of the waist-shaped holes is arranged along the first direction, and at least one limit pin is connected to the waist-shaped holes.

[0015] This solution recommends one specific way to adjust the position of the limit pin, which has the advantages of simple structure, low processing difficulty and low cost.

[0016] Preferably, a limit step and a locking nut are also provided on the limit pin. The limit step and the locking nut are respectively located on both sides of the longitudinal beam along the second direction. Rotating the locking nut can adjust the distance between the locking nut and the limit step.

[0017] This solution recommends one specific connection method between the limit pin and the longitudinal beam. By tightening the locking nut to reduce the distance between the locking nut and the limit step, the locking nut and the limit step can clamp the longitudinal beam, thereby restricting the relative position between the limit pin and the longitudinal beam and preventing the limit pin from accidentally moving away from the adjusted position, which may lead to the situation that the staff misjudges the width of the plate gap. When the position of the limit pin needs to be adjusted, loosening the locking nut can unlock the freedom of movement of the limit pin relative to the longitudinal beam.

[0018] Preferably, a slope measuring device is also provided on the longitudinal beam.

[0019] Since the two ends of the longitudinal beam are respectively located on two adjacent precast slabs during operation, the levelness (i.e., slope) of the longitudinal beam can also reflect the levelness formed by the two adjacent precast slabs. Therefore, this solution adds a slope measuring device on the longitudinal beam, which can help the staff measure the levelness formed by the two adjacent precast slabs, so as to ensure that the slope formed by the precast slabs can meet the requirements of the line slope.

[0020] Preferably, the slope measuring device includes an electronic slope measuring instrument.

[0021] The electronic slope measuring instrument can display the line slope in real time, which is more convenient for the staff to read the specific slope value reading. When the reading meets the design value, it means that the horizontal adjustment of the precast slab is in place and can meet the requirements of the line slope.

[0022] Preferably, at least one claw is respectively provided near both ends of the longitudinal beam along the first direction.

[0023] This solution respectively sets at least one claw at both ends of the longitudinal beam. When adjusting the relative position of two adjacent precast slabs, in addition to aligning the embedded holes of the two precast slabs with the two positioning pins respectively, the side walls of the two precast slabs can also be further abutted against the vertical sections of the claws at both ends of the longitudinal beam, so that the relative postures of the side walls of the two adjacent precast slabs can match the relative postures of the claws at both ends of the longitudinal beam. For example, if the vertical sections of the claws at both ends of the longitudinal beam are coplanar, the side walls of the two precast slabs respectively abutting against the vertical sections of the claws at both ends of the longitudinal beam are also coplanar. That is, this solution can assist in determining the relative posture of two adjacent precast slabs through the claws at both ends of the longitudinal beam, preventing angular deviation or position deviation (lateral deviation) along the second direction between the two adjacent precast slabs.

[0024] Preferably, a pointer is further connected to the position-limiting pin that is adjustable in position along the first direction, and the pointer points to an indicating scale.

[0025] This solution can facilitate the staff to determine the position of the position-limiting pin along the first direction.

[0026] Preferably, the width of the pointer gradually decreases along the direction close to the indicating scale.

[0027] This solution enables the staff to more accurately confirm the position of the position-limiting pin along the first direction.

[0028] Preferably, the end of the position-limiting pin is chamfered.

[0029] This solution can provide guidance for the action of inserting the position-limiting pin into the embedded hole and prevent the edges of the position-limiting pin from scratching the embedded hole.

[0030] Preferably, the longitudinal beam is a rectangular tube member.

[0031] All four sides of the rectangular tube member are flat surfaces, which can facilitate the setting of the indicating scale and the clamping claws, and ensure that the position-limiting step and the locking nut can be firmly attached to the surface of the longitudinal beam.

[0032] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0033] The present utility model provides a precast slab joint control device, which can use the embedded holes on two adjacent precast slabs as the measurement reference, and quickly limit the relative positions of the longitudinal beam and the precast slab, as well as the width of the joint between two adjacent precast slabs, through the clamping claws and two position-limiting pins on the longitudinal beam, without installing encrypted base marks or the staff holding a steel ruler for measurement operations. Therefore, a large amount of repetitive labor can be saved, the workload and working time of the measurement operation of the positioning parameters of the precast slab can be reduced, and the working efficiency can be improved, thereby accelerating the erection progress of the precast slab. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is the front view structural schematic diagram of a precast slab joint control device of the present utility model;

[0035] Figure 2 is the top view structural schematic diagram of a precast slab joint control device of the present utility model;

[0036] Figure 3 is the side view structural schematic diagram of a precast slab joint control device of the present utility model;

[0037] Figure 4 is the front view structural schematic diagram of a precast slab joint control device of the present utility model at the pointer;

[0038] Figure 5It is a partial top view structural schematic diagram at the joint of a precast slab construction scenario in Embodiment 1;

[0039] Figure 6 It is a partial enlarged top view structural schematic diagram when a precast slab joint control device of the present utility model is connected to a precast slab;

[0040] Icon:

[0041] 1 - Longitudinal beam; 11 - Indicating scale; 12 - Waist-shaped hole;

[0042] 2 - Limit pin; 21 - Limit step; 22 - Locking nut; 23 - Pointer;

[0043] 3 - Claw; 31 - Transverse section; 32 - Vertical section;

[0044] 4 - Slope measuring device;

[0045] 5 - Precast slab; 51 - Embedded hole. Specific implementation mode

[0046] The present utility model will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0047] In the description of the specific embodiments of the present utility model, without special explanation, the expression terms of the orientation or positional relationship indicated by "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / device / device of the present utility model is commonly used and placed. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it cannot be understood as a limitation to the present utility model.

[0048] In addition, when terms such as "horizontal", "vertical", "hanging", "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in directions such as "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the technical solution of the present invention.

[0049] In addition, when expressions such as "first", "second", "third", etc. appear in the terms, they are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0050] In addition, in the description of the embodiments of the present invention, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be a situation exceeding 9.

[0051] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / limited, where terms such as "set", "installed", "connected", "coupled", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. This kind of connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0052] Embodiment 1

[0053] Such as Figures 1 to 6As shown in the figure, a control device for the joints of precast slabs includes a longitudinal beam 1, a limit pin 2, and a claw 3. The length of the longitudinal beam 1 is set along the first direction. An indicating scale 11 is arranged on the side surface of the longitudinal beam 1 along the first direction. The limit pin 2 is used to be inserted into the embedded hole 51 of the precast slab 5, and its diameter is smaller than that of the embedded hole 51. Two limit pins 2 are distributed on the longitudinal beam 1 at intervals along the first direction. The length of the limit pin 2 is set along the second direction, and the position of at least one limit pin 2 along the first direction is adjustable. The claw 3 includes a transverse section 31 and a vertical section 32. The length of the transverse section 31 is set along the third direction. One end of the transverse section 31 is connected to the longitudinal beam 1. The vertical section 32 is connected to the end of the transverse section 31 far from the longitudinal beam 1. The length of the vertical section 32 is set along the second direction. The shape of the surface of the vertical section 32 facing the longitudinal beam 1 matches the shape of the precast slab 5 (for example, if the side surface of the precast slab 5 is a plane, the surface of the vertical section 32 facing the longitudinal beam 1 is also a plane). The first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0054] In Figures 1 to 6 a spatial rectangular coordinate system is also used to indicate the first direction, the second direction, and the third direction. Among them, the direction indicated by the arrow x is the first direction; the direction indicated by the arrow y is the second direction; the direction indicated by the arrow z is the third direction.

[0055] In an optional implementation manner, the specific implementation method for the position of the limit pin 2 to be adjustable along the first direction includes, but is not limited to: arranging an active mechanism including a moving degree of freedom along the first direction between the longitudinal beam 1 and the limit pin 2, such as a slide rail-slider mechanism, a screw-nut mechanism, or a gear-rack mechanism; or arranging a plurality of mounting structures for mounting the limit pin 2 on the longitudinal beam 1 along the first direction, and changing the position of the limit pin 2 along the first direction by changing the mounting position of the limit pin 2.

[0056] In an optional implementation manner, for example Figure 2 as shown in the figure, a waist-shaped hole 12 is arranged on the longitudinal beam 1. The length of the waist-shaped hole 12 is set along the first direction. At least one limit pin 2 is connected to the waist-shaped hole 12, so that the position can be adjusted along the length direction of the waist-shaped hole 12.

[0057] In an optional implementation manner, the position of one of the two limit pins 2 along the first direction is adjustable, and the other is fixed relative to the longitudinal beam 1 along the first direction. The indicating scale 11 takes the fixed limit pin 2 as the zero point and gradually increases in the direction close to the position-adjustable limit pin 2. For example Figure 2 as shown in the figure, only one limit pin 2 is connected to the longitudinal beam 1 through the waist-shaped hole 12, and the other limit pin 2 is connected to the longitudinal beam 1 through a fixed hole. Reading the reading of the indicating scale 11 corresponding to the limit pin 2 at the waist-shaped hole 12, then this reading is equal to the distance between the two limit pins 2, which can avoid the situation that when the positions of both limit pins 2 are adjustable, it is necessary to calculate the difference between the readings corresponding to the two limit pins 2 to indirectly obtain the distance between the limit pins 2.

[0058] In an alternative embodiment, a limiting step 21 and a locking nut 22 are further provided on the limiting pin 2. The limiting step 21 and the locking nut 22 are respectively located on both sides of the longitudinal beam 1 along the second direction. Rotating the locking nut 22 can adjust the distance between the locking nut 22 and the limiting step 21, so as to clamp or loosen the longitudinal beam 1 by the locking nut 22 and the limiting step 21, thereby locking the position of the limiting pin 2 relative to the longitudinal beam 1.

[0059] In the above embodiment, the surfaces of the locking nuts 22 of the two limiting pins 2 facing away from the longitudinal beam 1 are flush, so as to ensure that the levelness of the longitudinal beam 1 can accurately match the levelness formed by two adjacent precast slabs 5, and avoid the situation that the reading of the slope measuring device 4 is inaccurate when the slope measuring device 4 is installed subsequently.

[0060] In the above embodiment, the specific structural form of the limiting step 21 includes but is not limited to: a retaining ring, a retaining block or a stepped shaft structure fixedly connected to the limiting pin 2; or a nut also threadedly connected to the limiting pin 2.

[0061] In the above embodiment, the limiting pin 2 can be a hexagon head screw, so as to reduce the manufacturing cost through standard parts, and its hexagon head can be used as the limiting step 21.

[0062] In the above embodiment, the end of the limiting pin 2 for inserting into the embedded hole 51 is provided with a non-threaded section to avoid interference of the thread with the insertion action of the limiting pin 2.

[0063] In an alternative embodiment, a slope measuring device 4 is further provided on the longitudinal beam 1. The slope measuring device 4 includes but is not limited to a spirit level, an inductive level or a capacitive level.

[0064] In the above embodiment, the slope measuring device 4 includes an electronic slope measuring instrument.

[0065] In the above embodiment, the slope measuring device 4 is arranged in the middle of the longitudinal beam 1.

[0066] In an alternative embodiment, at least one claw 3 is respectively arranged near both ends of the longitudinal beam 1 along the first direction. For example Figures 1 to 2 As shown, one claw 3 is respectively arranged at the positions near both ends of the longitudinal beam 1.

[0067] In an alternative embodiment, the claw 3 can be made of an L-shaped galvanized flat iron profile and is welded to the longitudinal beam 1.

[0068] In an alternative embodiment, a pointer 23 is further connected to the limiting pin 2 adjustable in position along the first direction, and the pointer 23 points to the indicating scale 11.

[0069] In an alternative embodiment, the width of the pointer 23 gradually decreases in the direction approaching the indicating scale 11. For example Figure 4 as shown, the width of the pointer 23 in the first direction gradually decreases from top to bottom to accurately point to a certain scale.

[0070] In an alternative embodiment, the end of the limit pin 2 is chamfered. For example Figures 3 to 4 as shown, one end of the limit pin 2 for inserting into the embedded hole 51 is rounded or squared.

[0071] In an alternative embodiment, the longitudinal beam 1 is a rectangular tube member. For example, the longitudinal beam 1 can be directly made of a stainless steel hollow rectangular tube profile.

[0072] As Figure 5 shown, when constructing the precast slab 5, a plurality of embedded holes 51 with high positioning accuracy are provided on each precast slab 5, and the corresponding embedded holes 51 on two adjacent precast slabs 5 are collinear in the first direction. Therefore, the distance between the corresponding embedded holes 51 on two adjacent precast slabs 5 in the first direction matches the width of the slab joint. Correspondingly, when using the precast slab joint control device, a pair of embedded holes 51 on two adjacent precast slabs 5 can be selected first. Assume that when the two adjacent precast slabs 5 are both in the designed installation position, the distance between the two embedded holes 51 in the first direction is D0. Adjust the position of the limit pin 2 on the longitudinal beam 1 in the first direction so that the distance between the two limit pins 2 is D1, and D1 matches D0. Insert one of the limit pins 2 into the embedded hole 51 of the already installed precast slab 5, and make the vertical section 32 of the corresponding claw 3 abut against the side wall of the already installed precast slab 5. Then adjust the position of the precast slab 5 to be installed through the track-laying trolley until the other limit pin 2 is aligned with the embedded hole 51 on the precast slab 5 to be installed (the projections in the XOZ plane coincide), and the side wall of the precast slab 5 to be installed also abuts against the vertical section 32 of the other claw 3, which means that the position of the precast slab 5 in the first direction and the third direction matches the designed installation position. At this time, raise the precast slab 5 through the track-laying trolley so that the two limit pins 2 are respectively inserted into the embedded holes 51 of the two precast slabs 5, and the width of the slab joint can be ensured to always meet the design requirements. Continue to adjust the height of the precast slab 5 until the reading of the slope measuring device 4 meets the design requirements, which means that the position of the precast slab 5 in the second direction also matches the designed installation position. The positioning operation of the precast slab 5 is completed, and the support frame of the precast slab 5 can be tightened and subsequent construction can be carried out.

[0073] It should be noted that when the subway line is bent, the width of the plate joint changes along the third direction. Therefore, two precast plate joint control devices can be respectively arranged at both ends of the plate joint along the third direction, and according to the designed positional relationship between two adjacent precast plates 5, the distances between the limit pins 2 in the two precast plate joint control devices are respectively adjusted to different values; when the two limit pins 2 of the two precast plate joint control devices respectively fall into the embedded holes 51 of two adjacent precast plates 5, and the readings of the slope measuring devices 4 of the two precast plate joint control devices all meet the design requirements, it can be explained that the positions of the precast plates 5 along the first direction, the second direction and the third direction all match the designed installation positions, and the curve formed by two adjacent precast plates 5 meets the design requirements.

[0074] After testing, when the precast plate joint control device of this embodiment is used to erect the precast plate 5, the time consumption is reduced from more than 20 minutes in the conventional case to about 10 minutes, and the fine adjustment speed is reduced from more than 10 minutes originally to about 5 minutes, which can greatly improve the construction efficiency of the precast plate 5.

[0075] The above content is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A precast slab joint control device, characterized in that, Including: A longitudinal beam (1), the length of the longitudinal beam (1) being arranged along a first direction; an indicating scale (11) is arranged on the surface of the longitudinal beam (1) along the first direction; Limit pins (2), two of the limit pins (2) are distributed at intervals along the first direction on the longitudinal beam (1), the length of the limit pins (2) being arranged along a second direction; the position of at least one of the limit pins (2) along the first direction is adjustable; A claw (3), the claw (3) includes a transverse section (31) and a vertical section (32), the length of the transverse section (31) being arranged along a third direction, one end of the transverse section (31) being connected to the longitudinal beam (1); the vertical section (32) is connected to the end of the transverse section (31) far from the longitudinal beam (1), the length of the vertical section (32) being arranged along the second direction; The first direction, the second direction and the third direction are perpendicular to each other in pairs.

2. The precast slab joint control device according to claim 1, characterized in that, A kidney-shaped hole (12) is arranged on the longitudinal beam (1), the length of the kidney-shaped hole (12) being arranged along the first direction, and at least one of the limit pins (2) is connected to the kidney-shaped hole (12).

3. The precast slab joint control device according to claim 2, characterized in that, A limit step (21) and a locking nut (22) are further arranged on the limit pin (2), the limit step (21) and the locking nut (22) are respectively located on both sides of the longitudinal beam (1) along the second direction, and rotating the locking nut (22) can adjust the distance between the locking nut (22) and the limit step (21).

4. The precast slab joint control device according to claim 1, wherein A gradient measuring device (4) is further arranged on the longitudinal beam (1).

5. The precast slab joint control device according to claim 4, characterized in that, The gradient measuring device (4) includes an electronic gradient measuring instrument.

6. A precast slab joint control device according to any one of claims 1 to 5, characterized in that At least one of the claws (3) is respectively arranged near both ends of the longitudinal beam (1) along the first direction.

7. A precast slab joint control device according to any one of claims 1 to 5, characterized in that A pointer (23) is further connected to the limit pin (2) whose position is adjustable along the first direction, and the pointer (23) points to the indicating scale (11).

8. The precast slab joint control device according to claim 7, wherein, The width of the pointer (23) gradually decreases along the direction close to the indicating scale (11).

9. A precast slab joint control device according to any one of claims 1 to 5, characterized in that The end of the limit pin (2) is chamfered.

10. A precast slab joint control device according to any one of claims 1 to 5, characterized in that, The longitudinal beam (1) is a rectangular pipe member.

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