A split-type precast foundation for a communication tower and its construction method

Abstract

The present invention discloses a split-type communication tower prefabricated foundation and a construction method thereof, and relates to the technical field of prefabricated foundation piles. It comprises prefabricated block 1, prefabricated block 2, prefabricated block 3 and a communication tower foundation block. The two sides of prefabricated block 2 close to prefabricated block 1 and prefabricated block 3, as well as the sides of prefabricated block 1 and prefabricated block 3 close to prefabricated block 2 are pre-embedded with transverse steel bars arranged through them. The joints on both sides of prefabricated block 1, prefabricated block 2 and prefabricated block 3 are provided with splicing plates. The splicing plates are passed through the transverse steel bars and then attached to the surface of the prefabricated blocks for connecting prefabricated block 1, prefabricated block 2 and prefabricated block 3. Through the arrangement of three prefabricated blocks and the communication tower foundation block, the present invention only requires a small amount of work such as hoisting and connection, as well as subsequent concrete pouring, on-site, which reduces a lot of on-site construction time and effectively shortens the overall project period. The pouring cavity and the inner cavity groove are connected through the pipe body, which optimizes the concrete pouring process. There is no need to pour separately in multiple locations, which reduces the complexity of the pouring process.

Description

Technical Field

[0001] The present invention relates to the technical field of precast foundation piles, and specifically to a split-type precast foundation for a communication tower and its construction method. Background Art

[0002] A precast base is a foundation structural member that is pre-fabricated off-site in a factory or at the construction site according to specific designs and specifications, and then transported to the construction site for installation. Only hoisting and connection are required on-site, which greatly reduces the on-site construction time and can effectively shorten the overall project duration. However, compared with traditional communication tower foundations, precast foundations are composed of multiple precast components spliced together, and the connection nodes are weak links. The overall structural performance is not as good as that of a monolithic in-situ cast concrete foundation. When encountering local ground settlement, partial ground settlement will cause uneven stress on each part of the pile body, and the connection part will bear greater shear stress and bending moment, easily leading to loosening, disconnection or even fracture at the connection, damaging the integrity of the pile body and reducing the bearing capacity of the pile.

[0003] Therefore, combining the advantages and disadvantages of split-type precast foundations for communication towers and integral foundations, we designed a split-type precast foundation for a communication tower and provided a corresponding construction method. Summary of the Invention

[0004] The purpose of the present invention is to provide a split-type precast foundation for a communication tower and its construction method to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A split-type precast foundation for a communication tower, comprising:

[0006] Precast block one, precast block two, precast block three and a communication tower foundation block;

[0007] On both sides of precast block two close to precast block one and precast block three, and on one side of precast block one and precast block three close to precast block two, horizontally penetrating steel bars are embedded. At the joint of the two sides of precast block one, precast block two and precast block three, splicing plates are provided. After the splicing plates are threaded onto the horizontally penetrating steel bars, they are attached to the surface of the precast blocks to connect precast block one, precast block two and precast block three;

[0008] The communication tower foundation block is installed on the top of precast block two, and through concrete pouring, precast block one, precast block two, precast block three and the communication tower foundation block are combined into an integral communication tower foundation.

[0009] Furthermore, in this solution, the middle of precast block two is recessed and the top is open. After the communication tower foundation block is installed on the top of precast block two, a cavity is formed in the recessed part as a pouring cavity. A perfusion through-hole is provided in the middle of the communication tower foundation block, and the perfusion through-hole is communicated with the inside of the pouring cavity.

[0010] Furthermore, regarding this solution, a circle of embedded steel bar anchor bolts is pre-embedded at the bottom of the second precast block. A reinforcement plate two is installed on the top of the embedded steel bar anchor bolts. A reinforcement plate one is also pre-embedded inside the communication tower foundation block, and a circle of vertical steel bars is installed around the reinforcement plate one.

[0011] Furthermore, regarding this solution, a hole is provided at the position of the reinforcement plate two corresponding to each vertical steel bar for positioning the vertical steel bar. A steel reinforcement cage structure is formed between the reinforcement plate and the vertical steel bars. The distance between the reinforcement plate two and the bottom wall of the pouring cavity ranges from 0 cm to 30 cm.

[0012] Furthermore, regarding this solution, a number of through holes are provided on both sides of the second precast block, as well as on one side of the first precast block and the third precast block facing the second precast block. Inner cavity grooves are provided inside the first precast block and the third precast block. The through holes provided on the second precast block are internally connected to the pouring cavity, and the through holes provided on the first precast block and the third precast block are internally connected to the inner cavity grooves. A pipe body is correspondingly provided at each through hole for connecting the first precast block, the second precast block, and the third precast block. A reinforcement member is also provided inside the pipe body, and the reinforcement member is a steel structure member.

[0013] Furthermore, regarding this solution, a number of groups of limiting ribs are provided on the inner wall of the pouring cavity. Each group of limiting ribs is arranged in a circle around the inner wall of the pouring cavity, and the vertical steel bars pass through the limiting ribs.

[0014] Furthermore, regarding this solution, on both sides of the second precast block close to the first precast block and the third precast block, as well as on one side of the first precast block and the third precast block close to the second precast block, edge depressions are provided. A tight combination member is provided at the edge depressions. The tight combination member includes a steel plate, and the steel plate is located at the edge depressions and is wrapped with rubber sheets on the surface.

[0015] Furthermore, regarding this solution, a number of lifting rings are provided on the tops of the first precast block, the second precast block, the third precast block, and the communication tower foundation block for hoisting. Among them, a sunken hole is provided on the top of the communication tower foundation block, and the lifting rings are located inside the sunken hole.

[0016] A construction method for a split communication tower, the above-mentioned precast foundation for a split communication tower, includes the following steps:

[0017] Step 1: Splicing of precast blocks;

[0018] Step 2: Installation of pipe bodies;

[0019] Step 3: Suspending the communication tower foundation block;

[0020] Step 4: First pouring of concrete and vibration;

[0021] Step 5: Installation of the communication tower foundation block;

[0022] Step 6: Continue to pour concrete from the pouring cavity until the pouring cavity is filled with concrete. During the pouring process, vibrate the concrete. After the concrete solidifies, the construction and installation of the precast foundation of the communication tower are completed.

[0023] For this solution, further, the steps of suspending the communication tower foundation block in step 3 include the following:

[0024] S1: Use a hoisting device to suspend the communication tower foundation block and slowly lift it to a position 1-2 meters above the second precast block.

[0025] S2: Insert the vertical steel bars into at least the first group of limiting steel bars and keep the communication tower foundation block in a horizontal state.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] Through the settings of three precast blocks, the communication tower foundation block, etc., on-site only hoisting, connection, and a small amount of subsequent operations such as concrete pouring are required, reducing a large amount of on-site construction time, effectively shortening the overall project duration. The pipe body connects the pouring cavity and the inner cavity groove, optimizing the concrete pouring process, eliminating the need for separate pouring at multiple locations, reducing the complexity of the pouring process, improving construction efficiency, and saving construction time and labor costs.

[0028] At the same time, the second precast block and the communication tower foundation block form a three-dimensional steel bar connection system through the embedded steel bar anchor bolts, reinforcement plates, and vertical steel bars, which can restrain the two from multiple directions, resist tensile, compressive, shear and other forces, and enhance the connection stability. After pouring the concrete, each precast block and the communication tower foundation block form an integral body, and the steel bar cage structure enables the force to be effectively transmitted and distributed in the structure, avoiding excessive local stress, and improving the integrity and stability of the structure; the pipe body connection design enables the concrete to fill the connection parts of each precast block, avoiding casting dead corners or cavities, and enhancing the overall strength and stability of the spliced split foundation piles.

[0029] In addition, the settings of the first reinforcement plate, the second reinforcement plate, the vertical steel bars, the limiting steel bars, etc. can not only improve the integrity and stability of the structure, but also provide efficient positioning when installing the communication tower foundation, reducing the assembly difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the front structural schematic diagram of the present invention;

[0031] Figure 2 is the overlooking structural schematic diagram of the present invention;

[0032] Figure 3 is the sectional structural schematic diagram after the concrete of the present invention is poured;

[0033] Figure 4 is of the present inventionFigure 3 Schematic enlarged structure diagram of part A.

[0034] In the figure: 1, precast block one; 2, precast block two; 201, pouring cavity; 3, precast block three; 4, communication tower foundation block; 401, perfusion through-hole; 5, splicing plate; 6, transverse steel bar; 7, lifting ring; 8, inner cavity groove; 9, reinforcement member; 10, pipe body; 11, vertical steel bar; 12, strengthening disc one; 13, strengthening disc two; 14, embedded steel bar anchor bolt; 15, limiting rib; 16, steel plate; 17, rubber sheet; 18, edge depression. Specific implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] As Figure 1 and Figure 2 shown, the present invention provides a technical solution: a split-type precast foundation for a communication tower, including a precast block one 1, a precast block two 2, a precast block three 3, and a communication tower foundation block 4. The precast block two 2 is located between the precast block one 1 and the precast block 3. The bottoms of the precast block one 1, the precast block two 2, and the precast block three 3 are all in contact with the ground foundation and are horizontally placed. The precast block one 1, the precast block two 2, and the precast block three 3 are spliced and installed horizontally. The communication tower foundation block 4 is installed on the top of the precast block two 2. After the construction party completes the splicing and installation of the precast block one 1, the precast block two 2, the precast block three 3, and the communication tower foundation block 4, concrete can be poured from the communication tower foundation block 4. The concrete spreads and circulates between the precast block one 1, the precast block two 2, the precast block three 3, and the communication tower foundation block 4, and forms a whole with the communication tower foundation block 4 and the three precast blocks after solidification, improving the strength of the precast foundation of the communication tower.

[0037] As Figure 3 shown, the middle of the precast block two 2 is recessed and the top is open. After the communication tower foundation block 4 is installed on the top of the precast block two 2, a cavity is formed in the recessed part as the pouring cavity 201. A perfusion through-hole 401 is provided in the middle of the communication tower foundation block 4 and the perfusion through-hole 401 is internally communicated with the pouring cavity 201. That is to say, when pouring concrete, it is necessary to pour concrete from the perfusion through-hole 401, and the concrete will enter the pouring cavity 201 in the first time, and form an integral body with the communication tower foundation block 4 after the concrete in the pouring cavity 201 solidifies, improving the foundation strength of the communication tower installation.

[0038] Due to the reason of post - pouring, it is necessary to ensure the bonding strength between the second precast block 2 and the communication tower foundation block 4. A circle of embedded steel bar anchor bolts 14 is embedded at the bottom of the second precast block 2. The top of the embedded steel bar anchor bolts 14 is used to install the second reinforcement plate 13. An inner reinforcement plate 12 is also embedded inside the communication tower foundation block 4. A circle of vertical steel bars 11 is installed around the inner reinforcement plate 12. A hole is provided at each position of the second reinforcement plate 13 corresponding to each vertical steel bar 11. When the communication tower foundation block 4 is butt - joint installed with the second precast block 2, the vertical steel bars 11 need to pass through the holes exactly. That is to say, a reinforcement plate is provided at both the top and the bottom of the vertical steel bars 11, and a steel cage structure is formed between the reinforcement plates and the vertical steel bars 11. After the concrete pouring is completed, the steel cage structure can greatly enhance the bonding strength between the two. It should be noted that the distance between the second reinforcement plate 13 and the bottom wall of the pouring cavity 201 is at least not less than 30 cm.

[0039] As Figure 3 shown, the embedded steel bar anchor bolts 14 and the second reinforcement plate 13 embedded at the bottom of the second precast block 2 and the vertical steel bars 11 embedded inside the communication tower foundation block 4 are precisely positioned and inserted through the holes on the reinforcement plates during butt - joint installation, forming a three - dimensional steel bar connection system. This system can restrain the second precast block 2 and the communication tower foundation block 4 from multiple directions, effectively resist various acting forces such as tension, compression, and shear that may occur between them, and significantly enhance the stability of the connection. This structure can build a strong framework inside the concrete, making the concrete closely combine with the steel bars after solidification. The steel cage structure composed of the reinforcement plates and the steel bars makes the second precast block 2 and the communication tower foundation block 4 become an integral stress - bearing structure after concrete pouring. When the structure is subjected to external forces, the forces can be effectively transmitted and distributed between the second precast block 2 and the communication tower foundation block 4 through the steel cage, avoiding the situation of excessive local stress, enabling the entire structure to work together, and improving the integrity and stability of the structure.

[0040] As Figure 3As shown in the figure, further, on both sides of the second precast block 2, and on one side of the first precast block 1 and the third precast block facing the second precast block 2, a number of through holes are provided. Inner cavity grooves 8 are provided inside both the first precast block 1 and the third precast block 3. The through holes provided in the second precast block 2 are communicated with the inside of the pouring cavity 201, and the through holes provided in the first precast block 1 and the third precast block 3 are communicated with the inside of the inner cavity groove 8. A pipe body 10 is correspondingly provided at each through hole. The pipe body 10 can be a plastic pipe, an alloy pipe, a steel pipe or other tubular structures that are adapted to the inner wall of the through hole and are through at both ends. That is to say, the pipe body 10 can be used to connect the pouring cavity 201 and the inner cavity groove 8. When pouring concrete, the concrete overflows from the pipe body 10 and until it enters the inner cavity groove 8. The pipe body 10 can also effectively prevent the concrete from overflowing from the joint between the two precast blocks. A reinforcing member 9 is also provided inside the pipe body 10. The reinforcing member 9 can be a steel bar rod or a small steel cage or other steel structures that can increase the strength after the concrete solidifies.

[0041] As Figure 3 shown in the figure, the connection between the pouring cavity 201 and the inner cavity groove 8 is realized through the pipe body 10, so that when pouring concrete, the concrete can overflow from the pipe body 10 and enter the inner cavity groove 8, ensuring that the connecting parts of each precast block can be filled with concrete, guaranteeing the integrity of the overall structure pouring, effectively avoiding the occurrence of pouring dead corners or cavities, enhancing the overall strength and stability of the spliced split-type foundation piles. This connection design optimizes the concrete pouring process, eliminates the need for separate pouring operations at multiple locations, reduces the complexity of the pouring process, improves the construction efficiency, saves construction time and labor costs. During the solidification process of the concrete, the reinforcing member 9 and the concrete are interlocked, improving the tensile and shear resistance of the concrete, enhancing the mechanical properties of the pipe body part and the entire precast block connection part, further improving the bearing capacity and stability of the split-type foundation pile during use, reducing the possibility of damage or deformation of the foundation pile caused by external forces, and extending the service life of the foundation pile.

[0042] As Figure 3 shown in the figure, a number of groups of limiting ribs 15 are provided on the inner wall of the pouring cavity 201. Each group of limiting ribs 15 is arranged in a circle around the inner wall of the pouring cavity 201. The vertical steel bars 11 can pass through the limiting ribs 15, further increasing the structural stability of the vertical steel bars 11 and the hoisting stability of the communication tower foundation block 4.

[0043] Looking back Figure 1On both sides of the prefabricated block 2 2 near the prefabricated block 1 1 and the prefabricated block 3 3, as well as on one side of the prefabricated block 1 1 and the prefabricated block 3 3 near the prefabricated block 2 2, there are pre-embedded transverse steel bars 6, and both ends of the transverse steel bars 6 are provided with threads formed by tapping. Splicing plates 5 are provided at the joints on both sides of the prefabricated block 1 1, the prefabricated block 2 2 and the prefabricated block 3 3, and the splicing plates 5 are provided with holes corresponding to each transverse steel bar 6. The splicing plates 5 are passed through the transverse steel bars 6 and attached to the surface of the prefabricated block, and the splicing plates 5 are fixed with nuts. Before pouring, the splicing plate 5 is used to connect the prefabricated block 1, the prefabricated block 2 and the prefabricated block 3, which can effectively enhance the connection strength of the split foundation piles at the splicing points, so that the foundation piles can work together better when subjected to external forces, thereby improving the overall bearing capacity. This connection method can limit the relative displacement between the prefabricated blocks, and when the foundation piles are subjected to horizontal forces, vertical forces or other external forces, it reduces the possibility of dislocation and separation between the prefabricated blocks, thereby improving the stability and seismic performance of the entire foundation pile structure.

[0044] like Figure 4 As shown, edge recesses 18 are provided on both sides of prefabricated block 2 2 close to prefabricated block 1 1 and prefabricated block 3 3, as well as on one side of prefabricated block 1 1 and prefabricated block 3 3 close to prefabricated block 2 2. A tight-fitting part is provided at the edge recess 18, and the tight-fitting part includes a steel plate 16. The steel plate 16 is located at the edge recess 18 and the surface is wrapped with a rubber sheet 17. That is to say, when the joints of prefabricated block 1 1, prefabricated block 2 2, prefabricated block 3 3 and communication tower foundation block 4 are connected, they are in contact with each other by the rubber sheet 17. Since the molecular chain of rubber has great flexibility and interaction ability, when the two rubber blocks are squeezed together, the rubber molecular chain segments will approach each other. That is to say, due to the close fit of the rubber sheet 17, the sealing of the joint can be ensured, and the intrusion of rainwater from the joint to erode the concrete is reduced.

[0045] Based on the above-mentioned prefabricated foundation of the communication tower, we propose a construction method that relies on the above-mentioned prefabricated foundation of the communication tower:

[0046] Step 1: Splice the prefabricated blocks. Pass the splicing plate 5 through the embedded transverse steel bars 6 at the corresponding positions of prefabricated block 1, prefabricated block 2 and prefabricated block 3, so that it fits tightly against the surface of the prefabricated blocks. Then use the matching nuts to fix them. When tightening the nuts, use a torque wrench according to the specified torque value to ensure that the splicing is firm and that the prefabricated blocks after splicing are accurately positioned in the horizontal direction, and the bottom is in full contact with the ground foundation and remains horizontal.

[0047] Step 2: Install the tube body 10; insert the adapted tube body 10 into the through-holes of the prefabricated blocks, ensuring that the tube body 10 fits tightly against the inner wall of the through-hole and both ends are connected.

[0048] Step 3: Suspending the communication tower foundation block 4; using a hoisting device to suspend the communication tower foundation block 4, slowly lifting it to a position 1-2 meters above the precast block two 2. The vertical steel bar 11 is inserted into at least the first group of limiting steel bars 15. During the suspension process, keep the communication tower foundation block 4 in a horizontal state, and arrange a special person to observe the surrounding environment to ensure safety.

[0049] Step 4: Pouring and vibrating the concrete for the first time, pouring the concrete into the pouring cavity 201 and vibrating it until the concrete overflows into the inner cavity groove 8. Stop pouring the concrete when the concrete reaches 10 cm - 20 cm from the top of the precast block two 2.

[0050] Step 5: Installing the communication tower foundation block 4, using a hoisting device to place the communication tower foundation block 4 on the top of the precast block two 2.

[0051] Step 6: Continuing to pour the concrete from the pouring cavity 201 until the pouring cavity 201 is filled with concrete. Vibrate during the pouring process. After the concrete solidifies, the construction and installation of the communication tower precast foundation are completed.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended embodiments and their equivalents.

Claims

1. A split-type precast foundation for a communication tower, characterized in that, Including: Prefabricated block one (1), prefabricated block two (2), prefabricated block three (3) and communication tower foundation block (4); Prefabricated block two (2) is located in the middle of prefabricated block one (1) and prefabricated block three (3), and through-going transverse steel bars (6) are embedded on one side of prefabricated block one (1) and prefabricated block three (3) close to prefabricated block two (2). Splicing plates (5) are arranged at the joints on both sides of prefabricated block one (1), prefabricated block two (2) and prefabricated block three (3). After the splicing plates (5) are threaded on the transverse steel bars (6), they are attached to the surface of the prefabricated blocks to connect prefabricated block one (1), prefabricated block two (2) and prefabricated block three (3); The communication tower foundation block (4) is installed on the top of prefabricated block two (2), and the prefabricated block one (1), prefabricated block two (2), prefabricated block three (3) and the communication tower foundation block (4) are combined into an integrated communication tower foundation by concrete pouring; The middle of the prefabricated block two (2) is recessed and the top is open. After the communication tower foundation block (4) is installed on the top of the prefabricated block two (2), a cavity is formed in the recessed part as the pouring cavity (201). A perfusion through-hole (401) is opened in the middle of the communication tower foundation block (4), and the perfusion through-hole (401) is internally connected to the inside of the pouring cavity (201). A circle of embedded steel bar anchors (14) is embedded and installed at the bottom of the prefabricated block two (2), and a second reinforcement plate (13) is installed at the top of the embedded steel bar anchors (14). A first reinforcement plate (12) is also embedded in the communication tower foundation block (4). A circle of vertical steel bars (11) is installed around the first reinforcement plate (12). A hole is opened at the position of the second reinforcement plate (13) corresponding to each vertical steel bar (11) for positioning the vertical steel bar (11). A steel reinforcement cage structure is formed among the first reinforcement plate (12), the second reinforcement plate (13) and the vertical steel bars (11). The distance range from the second reinforcement plate (13) to the bottom wall of the pouring cavity (201) is 0 cm - 30 cm. A number of through-holes are opened on both sides of the prefabricated block two (2), and on one side of the prefabricated block one (1) and the prefabricated block three (3) facing the prefabricated block two (2). Inner cavity grooves (8) are opened in both the prefabricated block one (1) and the prefabricated block three (3). The through-holes opened in the prefabricated block two (2) are internally connected to the inside of the pouring cavity (201), and the through-holes opened in the prefabricated block one (1) and the prefabricated block three (3) are internally connected to the inside of the inner cavity grooves (8). A pipe body (10) is correspondingly arranged at each through-hole for connecting the prefabricated block one (1), the prefabricated block two (2) and the prefabricated block three (3). A reinforcement member (9) is also arranged in the pipe body (10), and the reinforcement member (9) is a steel structure member.

2. The precast foundation of a split communication tower according to claim 1, characterized in that: A number of groups of limiting ribs (15) are arranged at the inner wall of the pouring cavity (201). Each group of limiting ribs (15) is arranged in a circle around the inner wall of the pouring cavity (201), and the vertical steel bars (11) pass through the limiting ribs (15).

3. The precast foundation of a split communication tower according to claim 1, characterized in that: On both sides of the second precast block (2) close to the first precast block (1) and the third precast block (3), and on one side of the first precast block (1) and the third precast block (3) close to the second precast block (2), there are edge depressions (18). A tight binding member is provided at the edge depression (18). The tight binding member includes a steel plate (16), and the steel plate (16) is located at the edge depression (18) and its surface is wrapped with a rubber sheet (17).

4. The precast foundation of a split communication tower according to claim 1, characterized in that: On the tops of the first precast block (1), the second precast block (2), the third precast block (3) and the communication tower foundation block (4), there are a number of lifting rings (7) for hoisting. Among them, there is a depression hole on the top of the communication tower foundation block (4), and the lifting ring (7) is located in the depression hole.

5. A construction method for a split-type communication tower precast foundation as described in any one of claims 1-4, characterized in that, It includes the following steps: Step 1: Splicing of precast blocks; Step 2: Installing the pipe body (10); Step 3: Suspending the communication tower foundation block (4); Step 4: First pouring concrete and vibrating; Step 5: Installing the communication tower foundation block (4); Step 6: Continuing to pour concrete from the pouring cavity (201) until the pouring cavity (201) is filled with concrete. During the pouring process, vibrate, and after the concrete solidifies, complete the construction and installation of the split-type communication tower precast foundation.

6. The construction method according to claim 5, characterized in that: The step of suspending the communication tower foundation block (4) in the said Step 3 includes the following steps: S1: Hoist the communication tower foundation block (4) with a hoisting device and slowly lift it to a position 1 - 2 meters above the second precast block (2); S2: Insert the vertical steel bar (11) at least into the first group of limiting steel bars (15) and keep the communication tower foundation block (4) in a horizontal state.

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