Rectangular frame column settlement observation point pre-burying device and pre-burying construction method

Abstract

The application discloses a rectangular frame column settlement observation point pre-burying device and a pre-burying construction method. The device comprises a first L-shaped plate, a second L-shaped plate and a gear mechanism. The gear mechanism comprises a hollow rectangular base plate, a gear and a positioning ring. A settlement observation rod is arranged in the positioning ring, the gear and the hollow rectangular base plate. Upper bolts and lower bolts are arranged on the positioning ring. The method comprises the following steps: 1, rectangular frame column steel bar binding and formwork erection; 2, adjustment of the rectangular frame column settlement observation point pre-burying device; 3, installation of the rectangular frame column settlement observation point pre-burying device; 4, installation of the settlement observation rod; 5, concrete pouring and settlement observation rod pre-burying; and 6, removal of the rectangular frame column settlement observation point pre-burying device. After the rectangular frame column formwork is installed, the settlement observation point pre-burying device is used to pre-bury and fix the settlement observation point.

Description

Technical Field

[0001] This invention belongs to the field of settlement observation points for rectangular frame columns, and in particular relates to a pre-embedded device and pre-embedded construction method for settlement observation points for rectangular frame columns. Background Technology

[0002] Rectangular frame columns are a common structural column type in frame structures. They bear the loads from beams and slabs and transfer these loads to the foundation, serving as the primary vertical support structure. Currently, settlement monitoring points in rectangular frame columns are either pre-embedded or installed via drilling. In the pre-embedding construction of settlement monitoring points, to ensure secure and accurate installation, welding is often performed during the reinforcement binding process. This approach presents several problems:

[0003] (1) The pre-embedded welding is complicated, which affects the workers' steel bar binding and rectangular frame column formwork installation;

[0004] (2) The construction process is prone to damage, and quality problems such as displacement and tilting are likely to occur;

[0005] In addition, installation using post-drilling methods is prone to detachment and results in a poor appearance of the finished product.

[0006] Therefore, there is an urgent need for a simple and reasonably designed pre-embedded device for settlement observation points of rectangular frame columns. This device eliminates the need for prior welding. After workers have tied the reinforcing bars and installed the rectangular frame column formwork, the settlement observation points can be pre-embedded and fixed using this device. This avoids affecting the workers' construction and prevents damage to the pre-embedded points during construction. It greatly improves the qualification rate of pre-embedded settlement observation points, solves quality problems such as displacement and tilting, and is convenient, simple, and quick to operate. It also has high pre-embedding accuracy and a good finished product appearance. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a pre-embedded device for settlement observation points of rectangular frame columns, which addresses the shortcomings of the prior art. The device has a simple structure, reasonable design, and convenient installation and layout. It does not require prior welding. After the workers have tied the steel bars and installed the rectangular frame column formwork, the settlement observation points are pre-embedded and fixed using the device, which avoids the impact on the workers' construction and solves the problem of workers damaging the pre-embedded points during construction. The device has high pre-embedding accuracy, good finished product appearance, and strong practicality.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a pre-embedded device for settlement observation points of rectangular frame columns, characterized in that: it includes a first L-shaped plate, a second L-shaped plate, and a gear mechanism for adjusting the distance between the first L-shaped plate and the second L-shaped plate. The gear mechanism includes a hollow rectangular base plate, a gear disposed in the hollow rectangular base plate, and a positioning ring disposed on the front side of the hollow rectangular base plate. A settlement observation rod is inserted through the positioning ring, the gear, and the hollow rectangular base plate. An upper bolt and a lower bolt for locking the settlement observation rod are provided on the positioning ring.

[0009] One end of the first L-shaped plate and one end of the second L-shaped plate are both engaged with the gear, and the one end of the first L-shaped plate and one end of the second L-shaped plate are arranged in a staggered manner.

[0010] The above-mentioned rectangular frame column settlement observation point pre-embedded device is characterized in that: the first L-shaped plate includes a first horizontal plate and a first vertical plate arranged perpendicular to the first horizontal plate, a first through groove is provided in the first horizontal plate, the length of the first through groove is less than the length of the first horizontal plate, a gap is provided between one end of the first through groove and the end of the first horizontal plate away from the first vertical plate, and a lower toothed rack is provided on the inner wall of the lower side of the first through groove.

[0011] The above-mentioned rectangular frame column settlement observation point pre-embedded device is characterized in that: the second L-shaped plate includes a second horizontal plate and a second vertical plate arranged perpendicular to the second horizontal plate, a second through groove is provided in the second horizontal plate, the length of the second through groove is less than the length of the second horizontal plate, a gap is provided between one end of the second through groove and the end of the second horizontal plate away from the second vertical plate, and an upper toothed rack is provided on the inner wall of the upper side of the second through groove.

[0012] The lower rack meshes with the lower side of the gear, the upper rack meshes with the upper side of the gear, and the lower rack and upper rack are staggered front to back.

[0013] The aforementioned pre-embedded device for settlement observation points of rectangular frame columns is characterized in that: a first butterfly bolt is provided on the first vertical plate, and a second butterfly bolt is provided on the second vertical plate.

[0014] The above-mentioned rectangular frame column settlement observation point pre-embedded device is characterized in that: a central shaft is integrally formed in the gear, and mounting through holes are provided in the front and rear sides of the hollow rectangular base plate, the two ends of the central shaft are located in the mounting through holes, the central shaft is hollow, and the inner diameter of the central shaft is the same, and the horizontal rod of the settlement observation rod passes through the positioning ring and the central shaft.

[0015] The above-mentioned rectangular frame column settlement observation point pre-embedded device is characterized in that: the upper side of the first horizontal plate and the second horizontal plate are attached to the inner upper side of the hollow rectangular substrate, and the lower side of the first horizontal plate and the second horizontal plate are attached to the inner lower side of the hollow rectangular substrate.

[0016] The rear side of the first horizontal plate is attached to the inner rear side of the hollow rectangular substrate, and the front side of the second horizontal plate is attached to the inner front side of the hollow rectangular substrate.

[0017] The aforementioned pre-embedded device for settlement observation points of rectangular frame columns is characterized in that: a first screw hole is provided on the first horizontal plate, and a second screw hole is provided on the second horizontal plate, wherein self-tapping screws are installed in both the first screw hole and the second screw hole.

[0018] Meanwhile, this invention also discloses a simple, reasonable, and convenient method for pre-embedding settlement observation points for rectangular frame columns, characterized by the following steps:

[0019] Step 1: Reinforcement binding and formwork erection for rectangular frame columns:

[0020] Manually tie the reinforcing bars of the rectangular frame columns and erect the formwork for the rectangular frame columns;

[0021] Step 2: Adjustment of the pre-embedded device for settlement observation points of rectangular frame columns:

[0022] The operation involves moving the first horizontal plate in the first L-shaped plate and the second horizontal plate in the second L-shaped plate in a linear motion relative to the gear, causing the first and second horizontal plates to retract and the first and second vertical plates to move closer together; or the operation involves moving the first horizontal plate in the first L-shaped plate and the second horizontal plate in the second L-shaped plate in a linear motion in opposite directions relative to the gear, causing the first and second horizontal plates to extend and the first and second vertical plates to move away from each other, until the distance between the first and second vertical plates meets the side length requirement of the rectangular frame column section, and the position of the positioning ring meets the requirements of the pre-embedded position of the settlement observation point.

[0023] Step 3: Installation of the pre-embedded device for settlement observation points of rectangular frame columns:

[0024] Step 301: Install the pre-embedded device for the settlement observation point of the rectangular frame column on the rectangular frame column template, and tighten the first wing bolt and the second wing bolt until the ends of the first wing bolt and the second wing bolt are pressed against the rectangular frame column template.

[0025] Step 302: Install self-tapping screws in the first screw holes on the first horizontal plate and the second screw holes on the second horizontal plate; wherein the tip of the self-tapping screw extends into the rectangular frame column template;

[0026] Step 4: Installation of Settlement Observation Rods:

[0027] Settlement observation rods are inserted through the positioning ring, gear, and hollow rectangular substrate, and upper and lower bolts are installed on the positioning ring to lock the settlement observation rods; wherein, the horizontal rod of the settlement observation rod passes through the rectangular frame column template and extends into the rectangular frame column template, while the vertical rod of the settlement observation rod is located outside the rectangular frame column template;

[0028] Step 5: Concrete pouring and settlement monitoring rod pre-embedding:

[0029] Concrete is poured inside the rectangular frame column template to form a rectangular concrete frame column, and the horizontal end of the settlement observation rod is pre-embedded in the rectangular concrete frame column; the vertical rod of the settlement observation rod is located outside the rectangular concrete frame column.

[0030] Step Six: Removal of the pre-embedded device for settlement observation points on rectangular frame columns:

[0031] Step 601: Loosen the upper and lower bolts to release the locking of the settlement observation rod;

[0032] Step 602: Loosen the self-tapping screws, the first wing bolt and the second wing bolt, and adjust the distance between the first vertical plate and the second vertical plate to increase the distance between them;

[0033] Step 603: Slowly remove the pre-embedded device for the settlement observation point of the rectangular frame column from the settlement observation rod.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1. The present invention has a simple structure, reasonable design, and is easy to install and deploy, with low investment cost.

[0036] 2. The present invention uses a hollow rectangular base plate, which on the one hand limits one end of the first L-shaped plate and one end of the second L-shaped plate; on the other hand, it enables the installation of gears and allows for the pre-embedding of settlement observation points for rectangular frame columns of different sizes, which can be reused repeatedly.

[0037] 3. In this invention, one end of the first L-shaped plate and one end of the second L-shaped plate are both meshed with gears and staggered, thereby realizing the adjustment of the extension length of the first L-shaped plate and the second L-shaped plate until the size of the rectangular frame column template is met, which improves the convenience of construction and has a wide range of applications.

[0038] 4. The invention includes upper and lower bolts to secure the settlement observation rod after it has been adjusted to the correct position. This prevents the settlement observation rod from shifting during the concrete pouring of the rectangular frame column, thus solving quality problems such as displacement and tilting. The invention also features high pre-embedding accuracy and a good finished product appearance.

[0039] 5. The method for pre-embedding settlement observation points of rectangular frame columns of the present invention has simple steps, is easy to implement and operate, and ensures accurate pre-embedding.

[0040] 6. The method for pre-embedding settlement observation points in rectangular frame columns of the present invention first involves binding the reinforcing bars and erecting the formwork for the rectangular frame columns, then adjusting and installing the pre-embedding device for settlement observation points in the rectangular frame columns, followed by installing the settlement observation rod, pouring concrete and pre-embedding the settlement observation rod, and finally dismantling the pre-embedding device for settlement observation points in the rectangular frame columns. This facilitates recycling, improves construction efficiency and quality, and saves construction costs.

[0041] In summary, this invention has a simple structure, reasonable design, and convenient installation. It does not require prior welding. After the workers have tied the reinforcing bars and installed the rectangular frame column formwork, the settlement observation point pre-embedded device is used to pre-embed and fix the settlement observation points, which avoids the impact on the workers' construction and solves the problem of workers damaging the pre-embedded points during construction. The pre-embedding accuracy is high, the finished product has a good appearance, and it is highly practical.

[0042] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the present invention.

[0044] Figure 2 This is a schematic diagram of the gear structure of the present invention.

[0045] Figure 3 This is a flowchart of the method of the present invention.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1—First L-shaped plate; 1-1—First horizontal plate; 1-2—First vertical plate;

[0048] 1-3—First wing bolt; 1-4—First through slot; 1-5—Lower rack;

[0049] 1-6—First screw hole; 2—Second L-shaped plate; 2-1—Second horizontal plate;

[0050] 2-2—Second vertical plate; 2-3—Second wing bolt; 2-4—Second through slot;

[0051] 2-5—Upper rack; 2-6—Second screw hole; 3—Settlement observation rod;

[0052] 4—Locking ring; 5—Lower bolt; 6—Upper bolt;

[0053] 7—Hollow rectangular substrate; 8—Gear; 9—Central shaft. Detailed Implementation

[0054] like Figure 1 and Figure 2 As shown, the present invention includes a first L-shaped plate 1, a second L-shaped plate 2, and a gear mechanism for adjusting the distance between the first L-shaped plate 1 and the second L-shaped plate 2. The gear mechanism includes a hollow rectangular base plate 7, a gear 8 disposed in the hollow rectangular base plate 7, and a positioning ring 4 disposed on the front side of the hollow rectangular base plate 7. A settlement observation rod 3 is inserted through the positioning ring 4, the gear 8, and the hollow rectangular base plate 7. An upper bolt 6 and a lower bolt 5 are provided on the positioning ring 4 to lock the settlement observation rod 3.

[0055] One end of the first L-shaped plate 1 and one end of the second L-shaped plate 2 are both engaged with the gear 8, and the one end of the first L-shaped plate 1 and one end of the second L-shaped plate 2 are arranged in a staggered manner.

[0056] In this embodiment, the first L-shaped plate 1 includes a first horizontal plate 1-1 and a first vertical plate 1-2 arranged perpendicular to the first horizontal plate 1-1. A first through groove 1-4 is provided in the first horizontal plate 1-1. The length of the first through groove 1-4 is less than the length of the first horizontal plate 1-1. A gap is provided between one end of the first through groove 1-4 and the end of the first horizontal plate 1-1 away from the first vertical plate 1-2. A lower toothed rack 1-5 is provided on the inner wall of the lower side of the first through groove 1-4.

[0057] In this embodiment, the second L-shaped plate 2 includes a second horizontal plate 2-1 and a second vertical plate 2-2 arranged perpendicular to the second horizontal plate 2-1. A second through groove 2-4 is provided in the second horizontal plate 2-1. The length of the second through groove 2-4 is less than the length of the second horizontal plate 2-1. A gap is provided between one end of the second through groove 2-4 and one end of the second horizontal plate 2-1 away from the second vertical plate 2-2. An upper toothed rack 2-5 is provided on the inner wall of the upper side of the second through groove 2-4.

[0058] The lower rack 1-5 meshes with the lower side of the gear 8, and the upper rack 2-5 meshes with the upper side of the gear 8. The lower rack 1-5 and the upper rack 2-5 are arranged in a staggered manner.

[0059] In this embodiment, a first butterfly bolt 1-3 is provided on the first vertical plate 1-2, and a second butterfly bolt 2-3 is provided on the second vertical plate 2-2.

[0060] In this embodiment, the gear 8 is integrally formed with a central shaft 9, and the hollow rectangular substrate 7 has mounting through holes on its front and rear sides. The two ends of the central shaft 9 are located in the mounting through holes. The central shaft 9 is hollow, and the inner diameter of the central shaft 9 is the same as the inner diameter of the positioning ring 4. The horizontal rod of the settlement observation rod 3 passes through the positioning ring 4 and the central shaft 9.

[0061] In this embodiment, the upper sides of the first horizontal plate 1-1 and the second horizontal plate 2-1 are attached to the inner upper side of the hollow rectangular substrate 7, and the lower sides of the first horizontal plate 1-1 and the second horizontal plate 2-1 are attached to the inner lower side of the hollow rectangular substrate 7.

[0062] The rear side of the first horizontal plate 1-1 is attached to the inner rear side of the hollow rectangular substrate 7, and the front side of the second horizontal plate 2-1 is attached to the inner front side of the hollow rectangular substrate 7.

[0063] In this embodiment, the first horizontal plate 1-1 is provided with a first screw hole 1-6, and the second horizontal plate 2-1 is provided with a second screw hole 2-6. Self-tapping screws are installed in both the first screw hole 1-6 and the second screw hole 2-6.

[0064] In this embodiment, the first through groove 1-4 and the second through groove 2-4 are provided, on the one hand for the arrangement of the lower rack 1-5 and the upper rack 2-5, and on the other hand for accommodating the gear 8, thereby realizing integrated installation and adjustment.

[0065] In this embodiment, the first through groove 1-4 penetrates the front and rear sides of the first horizontal plate 1-1; the second through groove 2-4 penetrates the front and rear sides of the second horizontal plate 2-1.

[0066] In this embodiment, in actual use, the sum of the thicknesses of the lower rack 1-5 and the upper rack 2-5 is the same as the thickness of the gear 8. Furthermore, the thicknesses of the lower rack 1-5, the upper rack 2-5, the first horizontal plate 1-1, and the second horizontal plate 2-1 are all the same, and are equal to half the distance between the front inner side and the rear inner side of the hollow rectangular substrate 7.

[0067] In this embodiment, one end of the central axis 9 is flush with the front side of the hollow rectangular substrate 7, and the other end of the central axis 9 is flush with the rear side of the hollow rectangular substrate 7.

[0068] In this embodiment, both the left and right ends of the hollow rectangular substrate 7 are connected to the internal hollow structure, which facilitates the insertion of the first horizontal plate 1-1 and the second horizontal plate 2-1.

[0069] In this embodiment, the lower rack 1-5 meshes with the lower side of the gear 8, and the upper rack 2-5 meshes with the upper side of the gear 8. The lower rack 1-5 and the upper rack 2-5 are staggered, which enables the first horizontal plate 1-1 and the second horizontal plate 2-1 to move linearly relative to the gear 8, and allows the first horizontal plate 1-1 and the second horizontal plate 2-1 to be adjusted for contraction and extension, adapting to rectangular frame columns with different cross-sectional side lengths.

[0070] In this embodiment, during actual use, the rear side of the hollow rectangular substrate 7 is detachably connected by bolts to facilitate the interlocking installation of the first horizontal plate 1-1 and the second horizontal plate 2-1, and to facilitate the adjustment of the installation position of the gear 8 and the hollow rectangular substrate 7 on the first horizontal plate 1-1 and the second horizontal plate 2-1.

[0071] In this embodiment, during actual use, both ends of the central shaft 9 are located in the mounting through holes. To improve the flexibility of rotation, bearings can be added in the mounting through holes, and both ends of the central shaft 9 can be installed in the bearings; or lubricating oil can be provided on the outer walls of both ends of the central shaft 9 and in the mounting through holes to reduce rotational friction.

[0072] In this embodiment, the inner diameter of the central shaft 9 and the inner diameter of the positioning ring 4 are set to be the same so that the horizontal rod of the settlement observation rod 3 passes through the positioning ring 4 and the central shaft 9, thereby facilitating the insertion of the horizontal rod of the settlement observation rod 3 into the rectangular frame column template.

[0073] In this embodiment, a hollow rectangular substrate 7 is provided to limit the upper, lower, and rear sides of the first horizontal plate 1-1, as well as the upper, lower, and front sides of the second horizontal plate 2-1, thereby improving the accuracy of the sliding path of the first horizontal plate 1-1 and the second horizontal plate 2-1.

[0074] In addition, by restricting the sliding path, the positioning ring 4 is limited, which in turn limits the settlement observation rod 3, thereby improving the accuracy of pre-embedding.

[0075] In this embodiment, both the upper bolt 6 and the lower bolt 5 are wing bolts, the settlement observation rod 3 is an L-shaped observation rod, the horizontal rod of the settlement observation rod 3 passes through the positioning ring 4 and the central shaft 9, and the upper bolt 6 and the lower bolt 5 pass through the top and bottom of the positioning ring 4 and abut against the upper and lower sides of the horizontal rod of the settlement observation rod 3.

[0076] In this embodiment, the settlement observation rod 3 is fixed by tightening the upper bolt 6 and the lower bolt 5, thereby preventing the settlement observation rod from shifting during the concrete pouring of the rectangular frame column. This solves quality problems such as displacement and tilting, and the pre-embedding accuracy is high, resulting in a good finished product appearance.

[0077] In this embodiment, it should be noted that the inner diameter of the positioning ring 4 is such that the rectangular frame column settlement observation point installation structure is slowly removed from the settlement observation rod 3.

[0078] like Figure 3 As shown, a method for pre-embedding settlement observation points for rectangular frame columns is described, which includes the following steps:

[0079] Step 1: Reinforcement binding and formwork erection for rectangular frame columns:

[0080] Manually tie the reinforcing bars of the rectangular frame columns and erect the formwork for the rectangular frame columns;

[0081] Step 2: Adjustment of the pre-embedded device for settlement observation points of rectangular frame columns:

[0082] The operation involves moving the first horizontal plate 1-1 in the first L-shaped plate 1 and the second horizontal plate 2-1 in the second L-shaped plate 2 in a linear motion relative to the gear 8, causing the first horizontal plate 1-1 and the second horizontal plate 2-1 to contract, and the first vertical plate 1-2 and the second vertical plate 2-2 to move closer to each other; or the operation involves moving the first horizontal plate 1-1 in the first L-shaped plate 1 and the second horizontal plate 2-1 in the second L-shaped plate 2 in a linear motion in opposite directions relative to the gear 8, causing the first horizontal plate 1-1 and the second horizontal plate 2-1 to extend, and the first vertical plate 1-2 and the second vertical plate 2-2 to move further apart, until the distance between the first vertical plate 1-2 and the second vertical plate 2-2 meets the side length requirements of the rectangular frame column template section.

[0083] Step 3: Installation of the pre-embedded device for settlement observation points of rectangular frame columns:

[0084] Step 301: Install the pre-embedded device for the settlement observation point of the rectangular frame column on the rectangular frame column template, and tighten the first butterfly bolt 1-3 and the second butterfly bolt 2-3 until the ends of the first butterfly bolt 1-3 and the second butterfly bolt 2-3 are pressed against the rectangular frame column template.

[0085] Step 302: Install self-tapping screws in the first screw hole 1-6 on the first horizontal plate 1-1 and the second screw hole 2-6 on the second horizontal plate 2-1; wherein the tip of the self-tapping screw extends into the rectangular frame column template;

[0086] Step 4: Installation of Settlement Observation Rods:

[0087] Settlement observation rods 3 are inserted through positioning ring 4, gear 8 and hollow rectangular base plate 7, and upper bolts 6 and lower bolts 5 are set on positioning ring 4 to lock settlement observation rods 3; wherein, the horizontal rod of settlement observation rod 3 passes through rectangular frame column template and extends into rectangular frame column template, and the vertical rod of settlement observation rod 3 is located outside rectangular frame column template;

[0088] Step 5: Concrete pouring and settlement monitoring rod pre-embedding:

[0089] Concrete is poured inside the rectangular frame column template to form a rectangular concrete frame column, and the horizontal extension end of the settlement observation rod 3 is pre-embedded in the rectangular concrete frame column; wherein, the vertical rod of the settlement observation rod 3 is located outside the rectangular concrete frame column.

[0090] Step Six: Removal of the pre-embedded device for settlement observation points on rectangular frame columns:

[0091] Step 601: Loosen the upper bolt 6 and the lower bolt 5 to release the locking of the settlement observation rod 3;

[0092] Step 602: Loosen the self-tapping screws, the first wing bolt 1-3 and the second wing bolt 2-3, and adjust the distance between the first vertical plate 1-2 and the second vertical plate 2-2 to increase the distance between them;

[0093] Step 603: Slowly remove the pre-embedded device for the settlement observation point of the rectangular frame column from the settlement observation rod 3.

[0094] In summary, this invention has a simple structure, reasonable design, and convenient installation. It does not require prior welding. After the workers have tied the reinforcing bars and installed the rectangular frame column formwork, the settlement observation point pre-embedded device is used to pre-embed and fix the settlement observation points, which avoids the impact on the workers' construction and solves the problem of workers damaging the pre-embedded points during construction. The pre-embedding accuracy is high, the finished product has a good appearance, and it is highly practical.

[0095] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A pre-embedded device for settlement observation points of rectangular frame columns, characterized in that: The utility model relates to a kind of adjustable L-shaped plate, including first L-shaped plate (1), second L-shaped plate (2) and gear mechanism adjusting the interval between first L-shaped plate (1) and second L-shaped plate (2), the gear mechanism includes hollow rectangular base plate (7), gear (8) being arranged in hollow rectangular base plate (7) and positioning ring (4) being arranged on the front side of hollow rectangular base plate (7), the positioning ring (4), gear (8) and hollow rectangular base plate (7) are provided with subsidence observation rod (3) in it, upper bolt (6) and lower bolt (5) being arranged on the positioning ring (4) are locked to subsidence observation rod (3); The end of the first L-shaped plate (1) and the end of the second L-shaped plate (2) are engaged with the gear (8), and the end of the first L-shaped plate (1) and the end of the second L-shaped plate (2) are arranged staggered.

2. The pre-burying device for the settlement observation point of the rectangular frame column according to claim 1, characterized in that: The first L-shaped plate (1) includes a first horizontal plate (1-1) and a first vertical plate (1-2) arranged perpendicularly to the first horizontal plate (1-1), a first through slot (1-4) is formed in the first horizontal plate (1-1), the length of the first through slot (1-4) is less than the length of the first horizontal plate (1-1), a gap is arranged between one end of the first through slot (1-4) and the end of the first horizontal plate (1-1) away from the first vertical plate (1-2), and a lower rack (1-5) is arranged on the inner wall of the lower side of the first through slot (1-4).

3. The pre-burying device for the settlement observation point of the rectangular frame column according to claim 2, characterized in that: The second L-shaped plate (2) includes a second horizontal plate (2-1) and a second vertical plate (2-2) arranged perpendicularly to the second horizontal plate (2-1), a second through slot (2-4) is formed in the second horizontal plate (2-1), the length of the second through slot (2-4) is less than the length of the second horizontal plate (2-1), a gap is arranged between one end of the second through slot (2-4) and the end of the second horizontal plate (2-1) away from the second vertical plate (2-2), and an upper rack (2-5) is arranged on the inner wall of the upper side of the second through slot (2-4). The lower rack (1-5) and the lower side of the gear (8) are engaged, the upper rack (2-5) and the upper side of the gear (8) are engaged, and the lower rack (1-5) and the upper rack (2-5) are arranged staggered.

4. The pre-burying device for the settlement observation point of the rectangular frame column according to claim 3, characterized in that: A first butterfly bolt (1-3) is arranged on the first vertical plate (1-2), and a second butterfly bolt (2-3) is arranged on the second vertical plate (2-2).

5. The rectangular frame column settlement observation point pre-burying device according to claim 1, characterized in that: A central shaft (9) is integrally formed in the gear (8), mounting through holes are arranged on the front side and the rear side of the hollow rectangular base plate (7), the two ends of the central shaft (9) are located in the mounting through holes, the central shaft (9) is hollow, the inner diameter of the central shaft (9) is the same as the inner diameter of the positioning ring (4), and the horizontal rod of the subsidence observation rod (3) passes through the positioning ring (4) and the central shaft (9).

6. The pre-burying device for rectangular frame column settlement observation point according to claim 3, characterized in that: The upper sides of the first horizontal plate (1-1) and the second horizontal plate (2-1) are attached to the inner upper side of the hollow rectangular base plate (7), and the lower sides of the first horizontal plate (1-1) and the second horizontal plate (2-2) are attached to the inner lower side of the hollow rectangular base plate (7). The rear side of the first horizontal plate (1-1) is attached to the inner rear side of the hollow rectangular base plate (7), and the front side of the second horizontal plate (2-1) is attached to the inner front side of the hollow rectangular base plate (7).

7. The pre-burying device for rectangular frame column settlement observation point according to claim 3, characterized in that: The first horizontal plate (1-1) is provided with a first screw hole (1-6), and the second horizontal plate (2-1) is provided with a second screw hole (2-6). Self-tapping screws are installed in the first screw hole (1-6) and the second screw hole (2-6).

8. A method of pre-burying construction using the device according to claim 4, characterized by, The method comprises the following steps: Step one, rectangular frame column reinforcement binding and formwork erection: Artificially bind the rectangular frame column reinforcement and erect the rectangular frame column formwork. Step two, adjustment of the rectangular frame column settlement observation point pre-embedded device: The first horizontal plate (1-1) and the second horizontal plate (2-1) of the first L-shaped plate (1) and the second L-shaped plate (2) are operated to move linearly relative to the gear (8). The first horizontal plate (1-1) and the second horizontal plate (2-1) are contracted, and the first vertical plate (1-2) and the second vertical plate (2-2) are close to each other; or the first horizontal plate (1-1) and the second horizontal plate (2-1) of the first L-shaped plate (1) and the second L-shaped plate (2) are operated to move linearly in the opposite direction relative to the gear (8). The first horizontal plate (1-1) and the second horizontal plate (2-1) are elongated, and the first vertical plate (1-2) and the second vertical plate (2-2) are away from each other, until the distance between the first vertical plate (1-2) and the second vertical plate (2-2) meets the length requirement of the rectangular frame column formwork cross section. Step three, installation of the rectangular frame column settlement observation point pre-embedded device: Step 301, install the rectangular frame column settlement observation point pre-embedded device on the rectangular frame column formwork, and screw the first butterfly bolt (1-3) and the second butterfly bolt (2-3) until the end of the first butterfly bolt (1-3) and the second butterfly bolt (2-3) is tightly pressed on the rectangular frame column formwork. Step 302, install self-tapping screws in the first screw hole (1-6) on the first horizontal plate (1-1) and the second screw hole (2-6) on the second horizontal plate (2-1); wherein the sharp part of the self-tapping screw extends into the rectangular frame column formwork. Step four, installation of the settlement observation rod: The settlement observation rod (3) is threaded through the positioning ring (4), the gear (8), and the hollow rectangular base plate (7), and the upper bolt (6) and the lower bolt (5) are arranged on the positioning ring (4) to lock the settlement observation rod (3); wherein the horizontal rod of the settlement observation rod (3) extends into the rectangular frame column formwork, and the vertical rod of the settlement observation rod (3) is located outside the rectangular frame column formwork. Step five, concrete pouring and settlement observation rod pre-embedding: Pour concrete into the rectangular frame column formwork to form a rectangular concrete frame column, and embed the horizontal rod of the settlement observation rod (3) into the rectangular concrete frame column; wherein the vertical rod of the settlement observation rod (3) is located outside the rectangular concrete frame column. Step six, removal of the rectangular frame column settlement observation point pre-embedded device: Step 601, loosen the upper bolt (6) and the lower bolt (5) to unlock the settlement observation rod (3). Step 602, loosen the self-tapping screw, the first butterfly bolt (1-3) and the second butterfly bolt (2-3), and adjust the distance between the first vertical plate (1-2) and the second vertical plate (2-2) to increase; Step 603, slowly remove the rectangular frame column settlement observation point pre-buried device from the settlement observation rod (3).

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