Pre-embedded anchor bolt construction method

Abstract

The invention relates to the technical field of building construction, and discloses a pre-embedded anchor bolt construction method which comprises the following steps: (1) a preparation stage; (2) a preliminary positioning stage: after the anchor bolt and the positioning plate are fixed, the positioning plate and the pre-embedded anchor bolt are preliminarily positioned through measurement and correction; and (3) a pouring positioning stage, including at least two times of pouring, measuring and correcting the position of the pre-embedded anchor bolt when the concrete is not solidified after each time of pouring, and pouring and positioning the pre-embedded anchor bolt. According to the scheme, the positioning plate and the pre-embedded anchor bolt are fixed in the mode of repeated pouring measurement correction in the pouring positioning stage, the deviation of the pre-embedded anchor bolt can be conveniently corrected in time, the concrete pouring stability of the pre-embedded anchor bolt can be further improved, and then the stability of ground building installation is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a pre-buried anchor bolt construction method. Background Art

[0002] In the process of construction, in order to improve the stability of the connection between the above-ground building and the foundation, embedded anchor bolts are often used to assist in connecting and fixing the above-ground building. Due to its strong stability, embedded anchors are widely used in the installation or construction of infrastructure such as railways, highways, power companies, factories, mines, bridges, tower cranes, large-span steel structures and large buildings, effectively improving the stability of the connection between the above-ground building and the foundation.

[0003] There are two main construction methods for pre-embedded anchor bolts. One is to first fix the pre-embedded anchor bolts and the motherboard of the ground building into a component, and then weld the component to the foundation steel bar and cast concrete to fix it (such as the prior art CN117145215B, a segmented assembly construction method for giant flower-shaped special-shaped steel columns for high-speed railway stations); the other is to set a positioning template, first position and weld the pre-embedded anchor bolts to the foundation steel bar, then remove the positioning template, and then cast concrete to fix the pre-embedded anchor bolts (such as CN106284399B, a pre-embedded positioning template and construction method for building column foot anchor bolts). However, the prior art still has the following technical problems:

[0004] (1) In the first positioning method, since the motherboard of a large building is also large in size, if it is first fixed to the pre-buried anchor bolts as an assembly and then the assembly is fixed to the foundation steel bar, a large amount of manpower or large equipment will be required during the adjustment process due to the large size of the motherboard, which is not easy to construct and the adjustment process takes longer, reducing the construction efficiency of the pre-buried anchor bolts;

[0005] (2) The exposed end of the embedded anchor bolt is usually provided with a thread. In the second positioning method, during the removal of the positioning template, the anchor bolt may be offset (or bent) and the construction accuracy of the embedded anchor bolt may be reduced, resulting in the need to adjust the position of the embedded anchor bolt again before the ground building is connected to the embedded anchor bolt thread, which not only delays the subsequent construction process; but also in the subsequent adjustment stage, because the embedded anchor bolt is fixed by concrete and offset from the predetermined position, it may need to be adjusted by strong hammering, which may easily damage the concrete poured in the early stage, thereby reducing the stability of the embedded anchor bolt connection; in addition, after the embedded anchor bolt is offset, the adjustment may also cause the embedded anchor bolt to be slightly bent, which may affect its load-bearing capacity for buildings with inclined columns installed on the upper part, reducing safety.

[0006] (3) In the prior art, during the concrete pouring stage, continuous concrete extrusion may also cause slight bending or deviation of the foundation steel bars, thereby causing the embedded anchor bolts welded on the foundation steel bars to deviate from the predetermined position, reducing the construction accuracy of the embedded anchor bolts, and further affecting the connection stability and load-bearing capacity.

[0007] In view of this, developing a high-precision pre-buried anchor construction method can not only effectively make up for the shortcomings of the existing technology, but also improve the construction accuracy of the pre-buried anchor, thereby improving the stability of the above-ground building installation, which is very important for safe construction. Summary of the invention

[0008] The present invention aims to provide a pre-buried anchor bolt construction method to solve the technical problem that the existing pre-buried anchor bolts may be displaced due to continuous concrete extrusion during the concrete pouring stage, thereby affecting the construction accuracy.

[0009] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a pre-buried anchor bolt construction method, comprising (i) a preparation stage; (ii) a preliminary positioning stage, after the anchor bolt and the positioning plate are fixed, the positioning plate and the pre-buried anchor bolt are preliminarily positioned after measurement and correction; (iii) a casting and positioning stage, including at least two castings, after each casting, the position of the pre-buried anchor bolt is measured and corrected before the concrete is solidified, and the pre-buried anchor bolt is cast and positioned.

[0010] Preferably, as an improvement, in the (a) preparation stage, all pre-buried anchor bolts are inspected, their dimensions are verified, bent and deformed anchor bolts are corrected, threads are cleaned, and damaged threads are repaired.

[0011] Preferably, as an improvement, the checking dimensions include checking the anchor bolt length, the gasket thickness and the thread length.

[0012] Preferably, as an improvement, in the (ii) preliminary positioning stage, the anchor bolt and the positioning plate are fixed as follows: the positioning plate is provided with a connecting hole at the position corresponding to the anchor bolt, and the top of the anchor bolt passes through the connecting hole and is connected to the positioning plate.

[0013] Preferably, as an improvement, the anchor bolt is fixedly connected to the connection hole of the positioning plate by welding or by double-sided nuts.

[0014] Preferably, as an improvement, in the (three) pouring and positioning stage, the first concrete pouring is to the bottom elevation of the anchor bolt, and the anchor bolt position is measured and corrected before the concrete solidifies. If the anchor bolt position changes, the position of the top of the anchor bolt is fine-tuned to the preset position; the second concrete pouring is to the top surface of the foundation, and the anchor bolt position is measured and corrected again before the concrete solidifies. If the anchor bolt position changes, the position of the top of the anchor bolt is fine-tuned to the preset position.

[0015] Preferably, as an improvement, in the (three) pouring and positioning stage, after pouring and positioning, the positioning plate is located above the top surface of the foundation or inside the foundation; when the positioning plate is located above the top surface of the foundation, in addition to fixing the positioning plate, the embedded anchor bolts are welded to the foundation steel bars; when the positioning plate is located inside the foundation, the positioning plate is welded to the foundation steel bars.

[0016] Preferably, as an improvement, the method for fixing the positioning plate to the foundation steel bars is as follows: at least three locations of the edge of the positioning plate are respectively fixed to different foundation steel bars by welding.

[0017] Preferably, as an improvement, it also includes (iv) a post-positioning processing stage, recording the position of the embedded anchor bolts, cleaning and protecting the top threads of the anchor bolts.

[0018] Preferably, as an improvement, in (iv) the post-positioning processing stage, protecting the top thread of the anchor bolt includes tying tarpaulin or PVC sleeve to protect the thread.

[0019] Preferably, as an improvement, a ventilation hole is provided in the center of the positioning plate.

[0020] Preferably, as an improvement, the embedded anchor rod is a straight anchor or a bent anchor. When the embedded anchor rod is a bent anchor, a steel bar perpendicular to the bent anchor plane is fixed inside the bent portion.

[0021] The principles and advantages of this solution are:

[0022] 1. Compared with the low construction accuracy of embedded anchor bolts in the prior art, this solution fixes the positioning plate and embedded anchor bolts by using multiple casting measurement and correction methods during the casting positioning stage, which not only facilitates timely correction of the offset of the embedded anchor bolts, but also further improves the concrete casting stability of the embedded anchor bolts, thereby improving the stability of the above-ground building installation.

[0023] 2. Compared with the prior art, after the embedded anchor bolts are initially positioned using a positioning template, the anchor bolts may be offset (or bent) during the removal of the positioning template, thereby reducing the construction accuracy of the embedded anchor bolts. In this solution, the positioning plate and the embedded anchor bolts are cast with concrete together after positioning is completed. This not only effectively avoids the embedded anchor bolts from deviating from the predetermined position when the auxiliary device is removed, but the positioning plate can also assist in measuring and correcting the position of the embedded anchor bolts during the concrete pouring stage, thereby speeding up the adjustment process and improving construction efficiency.

[0024] 3. Compared with the prior art where the embedded anchor bolts are directly welded and fixed to the foundation steel bars, which are easily deviated from the predetermined position due to external forces, this solution fixes at least three parts of the edge of the positioning plate to different foundation steel bars. On the one hand, it effectively improves the supporting and positioning effect of the foundation steel bars on the positioning plate; on the other hand, the multi-position fixed positioning plate can also effectively reduce the amount of displacement of the positioning plate with the foundation steel bars, thereby improving the construction accuracy of the embedded anchor bolts.

[0025] 4. This scheme uses positioning plates to preliminarily determine the embedded anchor bolts, and then cast concrete together with the positioning plates and embedded anchor bolts to fix them. This is not only convenient to operate and improves the efficiency of embedded adjustment; the embedded anchor bolts and positioning plates can also further improve the connection stability of the embedded anchor bolts, thereby further improving construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a cross-sectional view of the construction structure of the 1GL1 steel beam and embedded anchor bolts in the scene of the present invention.

[0027] Figure 2 This is a front view of the construction structure of the 1GL1 steel beam and embedded anchor bolts in the scene of the present invention.

[0028] Figure 3 This is a front view of the construction structure of the 2GL2 steel beam and embedded anchor bolts in the scene of the present invention.

[0029] Figure 4 This is a cross-sectional view of the construction structure of the square steel pipe column and embedded anchor bolts in Scenario 3 of the present invention.

[0030] Figure 5 for Figure 4 Top view of the structure (foundation and embedded anchors are not shown).

[0031] Figure 6 This is a top view of the construction structure of the square steel pipe column and embedded anchor bolts in Scenario 3 of the present invention.

[0032] Figure 7 It is a top view of the construction structure of the circular steel pipe column and embedded anchor bolts in scene 4 of the present invention.

[0033] Figure 8 It is a top view of the construction structure of the cross-shaped steel columns and embedded anchor bolts in scene 5 of the present invention.

[0034] Fig. 9 Schematic diagram of the construction scene of the embedded anchor bolts in Example 2 of the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto. Unless otherwise specified, the technical means used in the following examples and scenarios are conventional means well known to those skilled in the art, and the materials, reagents, etc. used can all be obtained from commercial sources.

[0036] The figure marks in the drawings of the specification include: lower foundation 101, upper foundation 102, steel column body 1, underground section 10, positioning plate 2, anchor bolts 3, nuts 4, filling layer 5, studs 6, T-shaped stiffening ribs 7, horizontal stiffening ribs 71, vertical stiffening ribs 72, reinforced shell 8, concrete layer 81, steel cage 82, column longitudinal reinforcement 821, column stirrups 822, inner stirrups 8221, outer stirrups 8222, dense stirrups 823, restraining core 9, exhaust hole 11, through hole 12, arc steel beam 13, triangular steel 14.

[0037] Example 1

[0038] This solution provides a pre-buried anchor bolt construction method, comprising the following steps:

[0039] (I) Preparation stage: including inspection and size verification of all pre-buried anchor bolts 3, correction of bent and deformed anchor bolts 3, cleaning of threads, and repair of damaged threads. Furthermore, size verification includes verification of anchor bolt 3 length, gasket thickness, and thread length.

[0040] (ii) Initial positioning stage: After the anchor bolts 3 and the positioning plate 2 are fixed, the positioning plate 2 and the embedded anchor bolts 3 are initially positioned after measuring the defense line positioning correction;

[0041] As an improvement, the method for fixing the anchor bolt 3 and the positioning plate 2 is as follows: a connection hole is opened at the position of the positioning plate 2 corresponding to the anchor bolt 3, and the top of the anchor bolt 3 passes through the connection hole and is connected to the positioning plate 2. As a reference, the anchor bolt 3 is fixedly connected to the connection hole of the positioning plate 2 by welding or by double-sided nuts. Specifically, in this embodiment, the anchor bolt 3 is fixedly connected to the connection hole of the positioning plate 2 by using double-sided nuts.

[0042] As an improvement, the positioning plate 2 is located above the top surface of the foundation or inside the foundation after casting.

[0043] Among them, in the first solution, when the positioning plate 2 is located above the top surface of the foundation, in addition to fixing the positioning plate 2, the embedded anchor bolts 3 are welded to the foundation steel bars; at this time, the positioning plate 2 is fixed by welding the positioning plate 2 to at least three different foundation steel bars. In the first solution, after the concrete is poured, the positioning plate 2 is still located on the foundation. In the process of installing the upper structure at the embedded anchor bolts 3, the upper surface of the positioning plate 2 effectively fits the bottom surface of the upper structure, and as a higher strength foundation, it effectively supports the upper structure, thereby further improving the installation tightness and stability of the two.

[0044] In the second solution, when the positioning plate 2 is located inside the foundation, the positioning plate 2 is welded to the foundation steel bars. Specifically, the method of fixing the positioning plate 2 to the foundation steel bars is as follows: at least three parts of the edge of the positioning plate 2 are respectively welded to different foundation steel bars. In the second solution, when pouring concrete, the top of the positioning plate 2 is not covered, and the positioning plate 2 and the lower part of the embedded anchor bolt 3 are preset inside the concrete, thereby effectively improving the accuracy and stability of the embedded anchor bolt 3.

[0045] Among them, measurement, laying out and positioning mainly include the following contents:

[0046] First, verify the secondary control points provided by the civil engineering. After the verification is correct, use the secondary control points to arrange tertiary control points along the edge of the structure as the pre-embedded measurement control points for anchor bolts 3, and use the tertiary control network as the measurement control benchmark for the embedding of anchor bolts 3.

[0047] Accurately pop out the axis control mark on the positioning sleeve plate, and select the four corner points of the axis on the sleeve plate as the elevation control points. According to the drawings, determine the coordinates of the four corner control points of each anchor bolt 3 positioning plate 2, and then measure and control the anchor bolt 3 in four steps:

[0048] (1) Use the theodolite, level and plumb bob to measure the installation position of the positioning plate 2;

[0049] (2) Before anchor bolt 3 is fixed in place, measurements are performed, mainly measuring the axis position, the diagonal of anchor bolt 3 and the top elevation of anchor bolt 3;

[0050] (3) Then measure and calibrate the anchor bolt 3 before and after pouring concrete;

[0051] (4) Finally, after the concrete solidifies, the buried results of the anchor bolt 3 are measured and the positioning ink line is popped out on the concrete surface.

[0052] (III) The pouring and positioning stage includes at least two pourings. After each pouring, the position of the embedded anchor bolts 3 is measured and corrected before the concrete solidifies, and the embedded anchor bolts 3 are poured and positioned. Specifically, the steps include:

[0053] S1. Pour concrete to the bottom elevation of anchor bolt 3 for the first time, and measure and calibrate the position of anchor bolt 3 before the concrete solidifies. If the position of anchor bolt 3 changes, fine-tune the position of the top of anchor bolt 3 to the preset position;

[0054] S2. Pour concrete for the second time to the top surface of the foundation. Measure and calibrate the position of the anchor bolt 3 again before the concrete solidifies. If the position of the anchor bolt 3 changes, fine-tune the position of the top of the anchor bolt 3 to the preset position.

[0055] Specifically, as a reference, corresponding to the first solution mentioned above (i.e., the positioning plate 2 is located above the top surface of the foundation), after the second concrete pouring, the positioning plate 2 is still located above the concrete surface. At this time, the position of the positioning plate 2 can be detected and fine-tuned to realize the detection and positioning of the embedded anchor bolt 3, thereby effectively improving the embedding accuracy and installation accuracy of the embedded anchor bolt 3.

[0056] Corresponding to the second solution mentioned above (i.e., the positioning plate 2 is located inside the foundation), after the second concrete pouring, the positioning plate 2 is located inside the foundation obtained by the concrete pouring, and the upper anchor rod of the embedded anchor bolt 3 is exposed outside the foundation. At this time, the upper anchor rod exposed outside the foundation can be inspected and fine-tuned to achieve the position adjustment of the positioning plate 2 and the embedded anchor bolt 3, thereby effectively improving the embedding accuracy and installation accuracy of the embedded anchor bolt 3. In addition, in the second solution, the lower anchor rod of the embedded anchor bolt 3 of the positioning plate 2 is concrete-cast inside the foundation together, further improving the embedding stability of the embedded anchor bolt 3, and then improving the installation stability when the upper building is installed on the embedded anchor bolt 3.

[0057] (IV) In the post-positioning processing stage, the position of the embedded anchor bolt 3 is recorded, and the top thread of the anchor bolt 3 is cleaned and protected. Protecting the top thread of the anchor bolt 3 includes tying tarpaulin or PVC sleeve to protect the thread.

[0058] The construction of embedded parts is mainly interspersed in the foundation and main construction stages of the civil engineering unit. In practical applications, embedded anchor bolts 3 for steel columns, embedded anchor plates for steel beams, and embedded anchor plates for steel columns can all be constructed according to this scheme. The embedded anchor bolts 3 and anchor plates are unloaded from the truck to the designated location by a car crane and manually transported and installed. In this scheme, the embedded anchor bolts 3 are fixed with positioning plates 2 for accurate positioning. The positioning plates 2 and embedded anchor bolts 3 can actually be located on the surface or inside of any one of (a) independent foundations, (b) the first concrete pouring position of the main structure beam, and (c) concrete column walls. When located on the surface of the foundation, the positioning plate 2 is fixed to the outer civil engineering steel bars with steel bars or scraps; when located inside the foundation, the positioning plate 2 is welded or tied to the foundation steel bars to prevent excessive impact on the position of the embedded parts during the pouring of concrete for civil engineering, and can also effectively avoid damage to the embedded parts and anchor bolts 3 during cross-operation construction.

[0059] Specific installation scenarios include but are not limited to the following types:

[0060] Scenario 1: GL1 steel beam and concrete column wall connection embedded anchor bolts

[0061] In this scenario, if Figure 1 and Figure 2 As shown, the positioning plate 2 is vertically fixed to the side wall of the concrete column wall foundation, and the embedded anchor bolts 3 are vertically fixed to the positioning plate 2 by perforation plug welding and embedded in the concrete column wall (foundation). As a reference, the anchor rod embedded in the concrete column wall is a straight anchor or a bent anchor. When it is a bent anchor, a steel bar perpendicular to the bent anchor plane is fixed inside the bent part, further improving the installation stability of the embedded anchor bolts 3. The number of embedded anchor bolts 3 depends on the size of the installed ground building (steel column body 1). Specifically, in this scenario, the ground building (steel column body 1) is a GL1 steel beam, and the number of embedded anchor bolts 3 is 6, evenly distributed around the GL1 steel beam.

[0062] According to the size difference of the installed steel column body 1, a through hole 12 can be set in the center of the positioning plate 2, and exhaust holes 11 can be evenly set in the middle of the edge to improve the efficiency and stability of pouring concrete and avoid excessive impact during pouring concrete, which may cause the positioning plate 2 to move and reduce its installation accuracy.

[0063] Scenario 2: GL2 steel beam and concrete column wall connection embedded anchor bolts

[0064] like Figure 3 As shown, the difference between this scenario and scenario 1 is that in this scenario, the ground building (steel column body 1) is a GL2 steel beam, and the number of pre-embedded anchor bolts 3 is 8, which are evenly distributed around the GL2 steel beam.

[0065] Scenario 3: Pre-embedded anchor bolts for connecting square steel pipe columns

[0066] like Figure 4 As shown, in this scenario, the positioning plate 2 is horizontally fixed to the foundation surface, and the embedded anchor bolts 3 and the positioning plate 2 are connected to the anchor rod threadedly through three sets of nuts 4 to achieve clamping and fixing of the fixing plate, wherein the above-ground part of the embedded anchor bolts 3 is matched with one set of nuts 4, and the underground part of the embedded anchor bolts 3 is matched with two sets of nuts 4. In addition, in this scenario, the third concrete pouring is also included after the second concrete pouring. Specifically, the second concrete pouring is to the bottom surface of the nuts 4 under the positioning plate 2. The third concrete pouring includes pouring grouting between the positioning plate 2 and the foundation, connecting the positioning plate 2 and the foundation, and wrapping the nuts 4 under the positioning plate 2, further improving the installation stability of the positioning plate 2 and the embedded anchor bolts 3.

[0067] Specifically, this scenario also discloses a column foot structure of a steel column, as shown in the attached Figure 4 As shown, it includes a steel column body 1, a positioning plate 2 welded and fixed at the bottom of the steel column body 1, and an anchor bolt 3 pre-buried in the lower foundation 101. The positioning plate 2 has a connection hole at the position corresponding to the anchor bolt 3, and the top of the anchor bolt 3 passes through the connection hole. By tightening the nut 4 threadedly connected to the anchor bolt 3 and located at the upper and lower positions of the positioning plate 2, the nuts 4 located at the upper and lower positions of the positioning plate 2 cooperate to clamp and fix the positioning plate 2, thereby achieving a fixed connection between the positioning plate 2 and the anchor bolt 3, thereby achieving a fixed connection between the steel column body 1 and the lower foundation 101. A filling layer 5 is provided between the positioning plate 2 and the lower foundation 101, and the filling layer 5 is a filling layer 5 formed by poured concrete.

[0068] The steel column body 1 is a square steel pipe column, a round steel pipe column or a cross steel column. In this scenario, the steel column is a square steel pipe column. The steel pipe column includes an above-ground section (not shown in the figure) and an underground section 10. A plurality of bolts 6 are welded and fixed on the outer wall of the underground section 10, and the small diameter end of the bolt 6 is connected to the underground section 10. Figure 6 As shown, the bolts 6 are evenly arranged in one circle around the underground section 10, and are evenly arranged in several circles in the vertical direction. T-shaped stiffening ribs 7 are also welded and fixed on the outer wall of the underground section 10. The T-shaped stiffening ribs 7 include horizontal stiffening ribs 71 arranged horizontally and vertical stiffening ribs 72 arranged vertically. The middle position of the bottom of the horizontal stiffening rib 71 is welded and fixed to the top of the vertical stiffening rib 72. The top of the horizontal stiffening rib 71 is flush with the top of the upper foundation 102.

[0069] The underground section 10 is surrounded by a rigid reinforcement shell 8, and a rigid constraint core 9 is inserted into the interior of the underground section 10. The top elevations of the reinforcement shell 8 and the constraint core 9 are both ±0.000 meters. The outer surface of the constraint core 9 fits the inner surface of the underground section 10. Specifically, the constraint core 9 is formed by pouring concrete.

[0070] The reinforced shell 8 includes a concrete layer 81 cast on the top of the lower foundation 101 and a steel cage 82 embedded in the concrete layer 81, and the bottom of the steel cage 82 extends out of the concrete layer 81 and is embedded in the lower foundation 101. In this scene, the outer contour of the concrete layer 81 is also square, and the center of the concrete layer 81 coincides with the horizontal projection of the center of the square steel pipe column.

[0071] The steel cage 82 includes a plurality of vertically arranged column longitudinal bars 821 and a plurality of horizontally arranged column stirrups 822. The column longitudinal bars 821 are evenly arranged in a square shape around the underground section 10. The column stirrups 822 are fixedly connected to the column longitudinal bars 821 at equal intervals in the vertical direction. Specifically, the column stirrups 822 are tied and fixed to the column longitudinal bars 821 by connecting members such as steel wires. Figure 5 As shown, the column stirrups 822 include inner stirrups 8221 and outer stirrups 8222 arranged in sequence from the inside to the outside, and the inner stirrups 8221 and the outer stirrups 8222 are connected end to end to form a closed stirrup ring to surround the underground section 10. In this scenario, the inner stirrups 8221 are octagonal, the outer stirrups 8222 are rectangular, and the joints of the inner stirrups 8221 and the outer stirrups 8222 are staggered.

[0072] like Figure 4 As shown, the steel cage 82 also includes a number of horizontally arranged dense stirrups 823, which are also tied and fixed to the column longitudinal reinforcement 821 by connecting members such as steel wires. The dense stirrups 823 are connected end to end to form a closed stirrup ring, which surrounds the T-shaped stiffening rib 7, that is, the dense stirrups 823 are arranged below the top of the upper foundation 102 and close to the top of the upper foundation 102. The dense stirrups 823 are arranged at equal intervals in the vertical direction, and the distance between two adjacent dense stirrups 823 is smaller than the distance between two adjacent column stirrups 822.

[0073] Scenario 5: Pre-buried anchor bolts for connecting circular pipe columns

[0074] The difference between this scenario and scenario 3 is that the steel column is a circular steel pipe column. The top view of the construction structure with the embedded anchor bolts is as follows: Figure 7 shown.

[0075] Scenario 6: Cross-shaped steel column connected with embedded anchor bolts

[0076] The difference between this scenario and scenario 3 is that the steel column is a cross-shaped steel column. The top view of the construction structure of the steel column and the embedded anchor bolt is as follows: Figure 7 shown.

[0077] Cross-shaped steel columns connected with embedded anchor bolts, top view structural diagram of the cross-shaped steel columns.

[0078] Example 2

[0079] This solution also provides a method for casting pre-embedded anchor bolts. After tying the steel bars, steel columns, steel beams, etc. are cast, and pre-embedded anchor bolts are used on the outer edge of the steel structure to assist in the subsequent process of fixing decorative panels, windows, exterior walls, and any other required components, or in some shopping malls, they are specially pre-embedded for subsequent hanging of decorative panels, etc. The specific steps are as follows:

[0080] After the steel structure is built, the triangular steel 14 is welded and fixed on the steel structure where the anchor bolts need to be embedded to improve the strength of the part, and then the steel bars are tied. This technology arranges the anchor bolts between adjacent triangular steels 14. During the pouring of concrete, the triangular steel 14 can also guide the concrete, allowing the concrete to flow through the gaps around the triangular steel 14, reducing the direct impact of the concrete on the anchor bolts; this method can be used for the pouring of various types of special-shaped buildings with large spans, especially when pre-embedded anchor bolts are required for special purposes on the steel structure of such buildings. The use of this layout method can further reduce the impact of the anchor bolt accuracy caused by the later pouring while improving the strength, thereby improving stability.

[0081] Below is Fig. 9 Taking the pouring of the first layer of curved steel beam 13 as an example, the steps are as follows:

[0082] Step 1: Weld and fix triangular steels 14 at intervals on the outer wall of the arc-shaped steel beam 13, and arrange the anchor bolts between adjacent triangular steels 14. The inclined surface of the triangular steel 14 is set downward so that more gaps are reserved below it on the outside. During the concrete pouring process, a large amount of concrete can flow from the gaps below on the outside, reducing the impact on the anchor bolts set between the triangular steels 14.

[0083] Step 2: Segmented symmetrical casting: Divide the arc-shaped steel beam 13 into a plurality of small segments. The length and width of each small segment are determined according to the structural characteristics and construction conditions, and are divided as evenly as possible.

[0084] A symmetrical casting method is adopted to cast two symmetrical sections of the arc-shaped steel beam 13 at the same time. This method is used to balance the load, improve the casting quality and the anchor pre-embedded accuracy. Symmetrical casting can reduce the impact of asymmetric pressure on anchors, especially for special-shaped beams such as arc beams or other large-span building structures with complex shapes. Symmetrical casting can reduce the asymmetric shrinkage and deformation of concrete, reduce the risk of displacement of anchors due to uneven loads, and improve the anchor pre-embedded accuracy. Symmetrical casting can ensure that concrete is evenly stressed at symmetrical positions, improve the bonding strength between anchors and concrete, and improve the casting effect and the stability of anchors. In addition, symmetrical casting can reduce the asymmetric shrinkage of concrete, reduce the occurrence of cracks, and improve the fixing effect of anchors.

[0085] Step 3: Vibrate thoroughly: Use a long-arm vibrator to fully vibrate each layer of concrete to ensure that the concrete is dense and free of bubbles.

[0086] In other embodiments other than this embodiment, when pouring each section of the arc steel beam 13 in step 2, a layered pouring method can be adopted to ensure the uniformity and density of the concrete. At the same time, the segmented pouring can gradually fix the anchor bolts, and pouring a small section each time ensures that the anchor bolts remain stable at each stage. It is also convenient to correct the position and angle of the anchor bolts, improve the accuracy and stability of the anchor bolts, and facilitate their accurate coordination with the subsequent installation structure. Layered pouring can also reduce the amount of concrete poured each time, reduce the pressure of the weight of the concrete on the anchor bolts, reduce the risk of displacement of the anchor bolts due to excessive loads, and improve the accuracy of anchor bolts.

[0087] This solution combines segmented pouring and paired pouring, which can simultaneously reduce the displacement of anchor bolts, improve the fixing effect of anchor bolts, reduce construction risks, and facilitate management, effectively improving the quality of pre-buried anchor bolt construction and the accuracy and stability of pre-buried anchor bolts.

[0088] Scene 7: Arc steel beam 13 connected with embedded anchor bolts

[0089] In this scenario, anchor bolts 3 are embedded in the outer edge of the curved steel beam 13 (the building structure reference of setting the curved steel beam 13 is shown in FIG. Fig. 9 As shown in the figure, firstly design a positioning plate 2 with the same curvature as the arc steel beam 13, and fix the anchor bolt 33 vertically on the positioning plate 22 by punching and plug welding. Arrange a steel cage (not shown in the figure) around the arc steel beam 13, and tie and fix the embedded anchor bolt 3 on the foundation steel bar of the steel cage, so that the positioning plate 2 is parallel to the arc steel beam 13. During the pouring process, the method in the aforementioned embodiment 2 is adopted, and the building is divided according to the overall structure, and the pouring is carried out by combining the two methods of symmetrical pouring and layered pouring, so as to improve the building pouring effect and the pre-embedded accuracy and pre-embedded stability of the anchor bolt 3.

[0090] In another similar scenario, a plurality of triangular steels 14 (such as Fig. 9 The first and topmost steel structures in the middle are used to assist in supporting the exterior wall decoration. At this time, the embedded anchor bolts 3 are fixed between two adjacent triangular steels 14, and a number of embedded anchor bolts 3 are set at intervals according to the actual number required. During the pre-fixing process, the anchor bolts 3 are pre-fixed in the gaps in the upper half of the triangular steels 14, so that during the concrete pouring process, the triangular steels 14 can buffer most of the concrete impact and vibration forces, reducing their impact on the pre-positioned anchor bolts 3; on the other hand, the gaps below the triangular steels 14 guide the concrete, further reducing the probability of displacement of the anchor bolts 3 under force, thereby further improving the pre-embedded accuracy of the anchor bolts 3.

[0091] If not otherwise specified, it is assumed that the embedded anchor bolts 3 in the above-mentioned specific cases in this solution are all tied and fixed on the foundation steel bars of the steel cage to achieve the initial positioning of the anchor bolts 3 and the positioning plate 2.

[0092] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. The pre-buried anchor bolt construction method is characterized by: It includes (i) a preparation stage; (ii) a preliminary positioning stage, in which the anchor bolts and positioning plates are fixed, and then the positioning plates and pre-embedded anchor bolts are preliminarily positioned after measurement and correction; (iii) a pouring and positioning stage, including at least two pourings, in which the position of the pre-embedded anchor bolts is measured and corrected before the concrete solidifies after each pouring, and the pre-embedded anchor bolts are cast and positioned.

2. The method for constructing pre-buried anchor bolts according to claim 1, characterized in that: The first stage is the preparation stage, which includes the inspection and size verification of all pre-buried anchor bolts, the correction of bent and deformed anchor bolts, the cleaning of threads, and the repair of damaged threads.

3. The method for constructing pre-buried anchor bolts according to claim 2, characterized in that: The dimensions to be checked include anchor bolt length, gasket thickness and thread length.

4. The method for constructing pre-buried anchor bolts according to claim 1, characterized in that: In the (ii) preliminary positioning stage, the anchor bolt and the positioning plate are fixed as follows: a connecting hole is opened on the positioning plate at the position corresponding to the anchor bolt, and the top of the anchor bolt passes through the connecting hole and is connected to the positioning plate.

5. The method for constructing pre-buried anchor bolts according to claim 4, characterized in that: The anchor bolts are fixedly connected to the connection holes of the positioning plate by welding or by double-sided nuts.

6. The method for constructing pre-buried anchor bolts according to claim 1, characterized in that: During the (iii) pouring and positioning stage, the first concrete pouring is to the bottom elevation of the anchor bolt. Before the concrete solidifies, the anchor bolt position is measured and corrected again. If the anchor bolt position changes, the position of the top of the anchor bolt is fine-tuned to the preset position. The second concrete pouring is to the top surface of the foundation. Before the concrete solidifies, the anchor bolt position is measured and corrected again. If the anchor bolt position changes, the position of the top of the anchor bolt is fine-tuned to the preset position.

7. The method for constructing pre-buried anchor bolts according to claim 6, characterized in that: In the (iii) pouring and positioning stage, after pouring and positioning, the positioning plate is located above the top surface of the foundation or inside the foundation; when the positioning plate is located above the top surface of the foundation, in addition to fixing the positioning plate, the embedded anchor bolts are welded to the foundation steel bars; when the positioning plate is located inside the foundation, the positioning plate is welded to the foundation steel bars.

8. The method for constructing pre-buried anchor bolts according to claim 7, characterized in that: The method for fixing the positioning plate to the foundation steel bars is as follows: at least three locations of the edge of the positioning plate are respectively welded and fixed to different foundation steel bars.

9. The method for constructing a pre-buried anchor bolt according to any one of claims 1 to 8, characterized in that: It also includes (iv) a post-positioning processing stage, which records the position of the embedded anchor bolts and cleans and protects the top threads of the anchor bolts.

10. The method for constructing pre-buried anchor bolts according to claim 9, characterized in that: In the (iv) post-positioning processing stage, the top thread of the anchor bolt is protected by tying tarpaulin or PVC sleeve to protect the thread.

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