Casting method for skew grid special-shaped crossed concrete-filled steel tube structure

Abstract

The invention discloses a method for pouring a skew grid special-shaped crossed concrete-filled steel tube structure, which comprises the following steps of: synchronously pouring concrete to flowing holes reserved above horizontal clapboards at the bottom layer and the top layer in a twisted waist-shaped steel tube from bottom to top in a layered manner by adopting a jacking method; therefore, the filling effect of the concrete compactness of the lower surface of each layer of horizontal partition plate and the elevation control of layered pouring can be ensured; whether cavities exist at the junctions of the horizontal partition plates and the vertical partition plates of the bottom layer and the middle layer and the upper surfaces of the pipe walls of the twisted kidney-shaped steel pipes or not is observed through the endoscope grouting pipe, and therefore whether the concrete pouring compactness meets the requirement or not is judged; when the concrete pouring compactness is insufficient, the endoscope grouting pipe is connected with the high-pressure grouting pump to conduct supplementary grouting on the cavity, so that the concrete compactness of the upper surfaces of the horizontal partition plates of the bottom layer and the middle layer meets the pouring requirement, and the concrete pouring quality of the twisted kidney-shaped steel pipe with the horizontal partition plates and the vertical partition plates is improved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for pouring concrete structures with obliquely intersecting grid-shaped steel pipes. Background Art

[0002] The oblique grid irregularly intersecting steel tube concrete structure, also known as the steel tube concrete oblique grid structure, is formed by bidirectionally inclined steel tube concrete columns intersecting to form an oblique grid outer tube, replacing traditional vertical columns and constituting a highly efficient lateral force resisting unit. Combined with a concrete core tube or frame inner tube, it forms a dual lateral force resisting system. The oblique grid forms Y-shaped and X-shaped nodes at the intersections, with the X-shaped nodes using a twisted cylindrical form as a smooth transition node. During the construction of the X-shaped twisted cylindrical node, concrete is poured inside the X-shaped twisted steel tube using a high-throw method. Due to the influence of the vertical and multiple horizontal diaphragms inside the X-shaped twisted steel tube, there is a problem of insufficient compaction during concrete pouring. Gas cannot escape from the X-shaped twisted steel tube in time, the concrete is difficult to vibrate, or the concrete's own fluidity prevents it from spreading over a large area or flowing to deeper parts. This results in gas cavities below the horizontal diaphragms and at the junction of the horizontal diaphragms and the tube wall, thus affecting the structural strength of the X-shaped twisted cylindrical column. The vertical diaphragms and multiple horizontal diaphragms inside the X-shaped twisted waist-shaped steel tube are essential components. Their purpose is to ensure the rigidity of the steel-concrete composite column at the intersection. The number of horizontal diaphragms can be increased or decreased as needed. The high-drop method involves pumping concrete from a high position without vibration, utilizing the principle of free fall to pour self-compacting concrete from the top to the bottom of the diagonally intersecting steel tube to form the diagonally intersecting grid.

[0003] Furthermore, because the oblique grid irregularly intersecting steel tube concrete structure adopts a layered casting method, the concrete aggregate floats in the cement paste under buoyancy in a static state. When subjected to a certain vibration frequency and amplitude, if the aggregate particle size is smaller than the limit value, the small-sized particles will not sink and fill into the concrete skeleton, but will instead float to the concrete surface. Especially for pumped concrete and high-flowability concrete, a layer of foamy paste often appears on the surface after pouring and vibration. This paste is generally a mixture of cement, fly ash, mineral powder, fine aggregate, and water and air bubbles, commonly known as "floating slurry." Since the floating slurry layer has virtually no coarse aggregate and a relatively high water-cement ratio, its presence will seriously affect the interlayer bonding quality of the concrete for layered concrete components. If a layer of concrete is poured directly on the floating slurry layer, the integrity of the upper and lower concrete layers will be very poor. Therefore, the floating slurry on the surface of the lower concrete layer needs to be removed before pouring the upper layer of concrete. How to remove the floating slurry at the intersection of the oblique grid becomes a challenge. Summary of the Invention

[0004] The purpose of this invention is to provide a method for pouring concrete for obliquely intersecting steel pipe structures with irregular cross-sections, in order to solve the problems of insufficient compaction of concrete at the intersections of obliquely intersecting grids and the inability to clean the laitance layer, which leads to poor pouring quality.

[0005] To address the aforementioned technical problems, this invention provides a method for casting a diagonally intersecting grid of irregularly shaped steel pipe concrete structures, comprising: Step S1: Two first pre-embedded pump pipes with their openings facing downwards are symmetrically pre-embedded on the lower oblique steel pipe near the twisted waist-shaped steel pipe; two second pre-embedded pump pipes with their openings facing downwards are symmetrically pre-embedded on the two limb pipes between the bottom layer and the upper layer of the twisted waist-shaped steel pipe and the horizontal partition; a second endoscopic grouting pipe is pre-embedded in the two limb pipes of the twisted waist-shaped steel pipe, so that the second endoscopic grouting pipe is aligned at the junction of the upper surface of the horizontal partition and the vertical partition of each intermediate layer; Step S2: Connect the two first pre-embedded pump pipes to the three-way pumping pipe through the shut-off valve. Open the shut-off valve and use the jacking method to simultaneously pour concrete from bottom to top onto the lower oblique steel pipe by connecting the concrete pumping equipment to the three-way pumping pipe. Pour concrete up to the pre-reserved flow hole above the bottom horizontal partition of the twisted waist-shaped steel pipe. Stop pouring, close the shut-off valve, remove the three-way pumping pipe, and seal the first pouring hole. Step S3: After the concrete has initially set, use a long-handled tool to reach into the top opening of the twisted waist-shaped steel pipe to clean the laitance layer on the bottom horizontal partition. Then, flush with water to remove the laitance residue through the flow hole. Step S4: Insert the first endoscope grouting tube through the flow hole to observe whether there is a cavity at the junction of the bottom horizontal partition and the vertical partition inside the twisted waist-shaped steel pipe. If a cavity exists, connect the high-pressure grouting pump through the first endoscope grouting tube to supplement the cavity with grout. If no cavity exists, seal the flow hole. Step S5: Connect the two second pre-embedded pump pipes to the three-way pumping pipe through the shut-off valve, open the shut-off valve, and continue to pour concrete synchronously into the two limb pipes of the twisted waist-shaped steel pipe by using the jacking method through the concrete pumping equipment connected to the three-way pumping pipe to the pre-reserved flow hole above the top horizontal partition. Stop pouring, close the shut-off valve, remove the three-way pumping pipe, and seal the second pouring hole. Step S6: After the poured concrete has initially set, clean the laitance layer on the top horizontal partition using the method in step S3. Step S7: Insert the first endoscope grouting pipe through the pre-reserved flow hole above the top horizontal partition to observe whether there is a cavity at the junction of the top horizontal partition and the vertical partition inside the twisted waist-shaped steel pipe. If there is a cavity, connect the high-pressure grouting pump through the first endoscope grouting pipe to supplement the cavity with grout. If there is no cavity, seal the flow hole. Step S8: Insert the first endoscopic grouting pipe into the observation hole opened on the outer wall of the twisted waist-shaped steel pipe above each intermediate layer horizontal partition to observe whether there is a cavity at the junction of the intermediate layer horizontal partition and the pipe wall of the twisted waist-shaped steel pipe. If a cavity exists, supplement grouting is performed on the cavity through the first endoscopic grouting pipe; if no cavity exists, the observation hole is blocked. Then, observe whether there is a cavity at the junction of the intermediate layer horizontal partition and the vertical partition through the pre-embedded second endoscopic grouting pipe. If a cavity exists, supplement grouting is performed on the cavity through the second endoscopic grouting pipe; if no cavity exists, supplement grouting is not performed.

[0006] Furthermore, the method for casting obliquely intersecting grid irregularly shaped steel pipe concrete structures provided by the present invention also includes: Step S9: Install upper oblique steel pipes above the two limbs of the twisted waist-shaped steel pipe, insert the tee pumping pipe into the upper oblique steel pipe and connect it to the concrete pumping equipment, start the concrete pumping equipment and pour concrete into the two upper oblique steel pipes simultaneously using the high-throw method.

[0007] Furthermore, the method for pouring oblique grid irregular cross steel pipe concrete structure provided by the present invention further includes, in step S3, using a first endoscopic grouting pipe to extend from the flow hole into the twisted waist-shaped steel pipe to observe whether the laitance layer is clean; if it is not clean, step S3 is repeated; if it is clean, step S4 is executed.

[0008] Furthermore, the method for pouring concrete into a diagonally intersecting grid irregular cross steel pipe structure provided by the present invention involves opening several ventilation holes around the central hole of each layer of horizontal partition before pouring concrete into the twisted waist-shaped steel pipe.

[0009] Furthermore, the method for casting oblique grid irregular cross steel pipe concrete structure provided by the present invention has unblocking holes provided on the vertical partition.

[0010] Furthermore, in the method for pouring concrete structure of oblique grid irregular cross steel pipe provided by the present invention, the first and second endoscopic grouting pipes have the same structure, both including a double-layer sleeve with a cavity and a camera set at its top. The cavity of the double-layer sleeve is a grouting channel, and the outer tube of the double-layer sleeve near the camera is provided with a grout outlet connected to the grouting channel.

[0011] Furthermore, in the method for casting oblique grid irregular cross steel pipe concrete structure provided by the present invention, in steps S4, S7 and S8, an endoscope without grouting function is used to replace the grouting tube of the first endoscope to observe whether there is a cavity. When a cavity exists, the endoscope without grouting function is pulled out and a grouting tube is inserted to supplement the grouting of the cavity.

[0012] Furthermore, the method for casting obliquely intersecting grid irregularly shaped steel pipe concrete structures provided by the present invention also includes: A grouting fitting is used instead of the second endoscope grouting tube. The grouting fitting includes a grouting rigid tube vertically installed in each limb pipe of the twisted waist-shaped steel pipe, and multiple grouting flexible tubes radially distributed below each grouting rigid tube. Each grouting flexible tube is attached to the lowest middle layer horizontal partition and extends to the inner wall of each limb pipe, and extends upward through the inner wall of each limb pipe to the top of the top horizontal partition. Supplementary grouting is performed using grouting pipe fittings. The rigid grouting pipe of the grouting pipe fittings is connected to a high-pressure grouting pump. The high-pressure grouting pump is started to inject high-pressure, high-strength grout into the rigid grouting pipe and each of the connected grouting hoses. When grout flows out from the upper end of each grouting hose, the high-pressure grouting pump is stopped, and the upper end of each grouting hose is sealed. The high-pressure grouting pump is then restarted to continue grouting the grouting pipe fittings. The grout in the grouting hoses will then rupture under high pressure and flow out to fill the junction of the lowest intermediate layer horizontal partition and the pipe wall and vertical partition of the twisted waist-shaped steel pipe. Grouting is then stopped.

[0013] Furthermore, in the method for pouring concrete structure of oblique grid irregular cross steel pipe provided by the present invention, in step S1, two third pre-embedded pump pipes with their opening directions facing upward are symmetrically pre-embedded in the lower oblique steel pipe through the first pouring hole, so that the third pre-embedded pump pipe passes through the central through hole of the bottom horizontal partition in the two limb pipes of the twisted waist-shaped steel pipe and is located above the bottom horizontal partition, in place of the first pre-embedded pump pipe.

[0014] Furthermore, in the method for pouring concrete structure of oblique grid irregular cross steel pipe provided by the present invention, in step S5, two fourth pre-embedded pump pipes are symmetrically pre-embedded in the two limb pipes of the twisted waist-shaped steel pipe through the second pouring hole, so that the vertical conveying pump pipe passes through the central through hole of the top horizontal partition and is located above the top horizontal partition, in place of the second pre-embedded pump pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for pouring concrete into an obliquely intersecting grid-shaped steel pipe concrete structure. This method connects to a concrete pumping device via a first and second pre-embedded pump pipe, employing a jacking method to simultaneously pour concrete layer by layer from bottom to top into the pre-reserved flow holes above the bottom and top horizontal partitions within the twisted waist-shaped steel pipe. This ensures the filling effect of the concrete density on the lower surface of each layer of horizontal partitions and controls the elevation of each layer of pouring. The method also allows for observation of the bottom and top horizontal partitions, vertical partitions, and twisted waist-shaped steel pipes via a first endoscopic grouting pipe. The presence of cavities at the junction of the upper surface of the pipe wall and the junction of the horizontal and vertical partitions in the middle layer is observed through the second endoscopic grouting pipe to determine whether the concrete pouring density meets the requirements. If the concrete pouring density is insufficient, the cavity is supplemented by grouting through the high-pressure grouting pump connected to the first and second endoscopic grouting pipes, so that the concrete density on the upper surface of each layer of horizontal partitions meets the pouring requirements, thereby improving the concrete pouring quality of the twisted waist-shaped steel pipe with horizontal and vertical partitions.

[0016] The present invention provides a method for pouring concrete for oblique grid irregular cross steel pipes. By using a long-handled tool to remove the laitance layer on the bottom and top horizontal partitions through the opening above the twisted waist-shaped steel pipe, and by cleaning the laitance residue on the bottom and top horizontal partitions with water, the laitance layer inside the twisted waist-shaped steel pipe is cleaned during layered pouring. This overcomes the problem that the high-throw method cannot clean the laitance when pouring concrete for twisted waist-shaped steel pipes.

[0017] The present invention provides a method for pouring concrete for oblique grid irregular cross steel pipe structures. By simultaneously pouring the two limb pipes of the oblique grid irregular cross steel pipe, the reliability, stability and quality of concrete pouring for oblique grid irregular cross steel pipe structures can be improved.

[0018] The present invention provides a method for pouring concrete structures using obliquely intersecting grid-shaped steel pipes. The flow holes on the twisted waist-shaped steel pipes can, on the one hand, control the elevation of the concrete pouring in layers, on the other hand, be used to insert an endoscope grouting pipe to observe the concrete density at the junction of the bottom horizontal partition, and on the other hand, be used to supplement the grouting of the cavity at the junction of the bottom and middle horizontal partitions, so as to avoid the problem of insufficient concrete density. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of an obliquely intersecting grid of irregularly shaped intersecting steel-concrete composite structures. Figure 2 This is a three-dimensional structural diagram of a twisted waist-shaped steel pipe; Figure 3 It is a three-dimensional perspective structural diagram of a twisted waist-shaped steel pipe; Figure 4This is a schematic diagram of the structure in Embodiment 1, in which the first pre-embedded pump pipe is symmetrically pre-embedded in the oblique steel pipe at the lower part of the twisted waist-shaped steel pipe; Figure 5 This is a schematic diagram of the structure in Example 1 where concrete is poured synchronously from bottom to top into the lower oblique steel pipe using a jacking method; Figure 6 This is a schematic diagram of the structure in Example 1, in which concrete is poured synchronously from bottom to top along the lower oblique steel pipe using the jacking method to the top of the bottom horizontal partition inside the twisted waist-shaped steel pipe; Figure 7 This is a schematic diagram of the structure in Example 1, showing the concrete pouring density at the junction of the upper surface of the bottom horizontal partition and the vertical partition after cleaning the concrete laitance layer above the bottom horizontal partition and observing it through the grouting pipe using an endoscope. Figure 8 This is a schematic diagram of the structure of the endoscope grouting pipe pre-embedded in the twisted waist-shaped steel pipe in Embodiment 1; Figure 9 This is a schematic diagram of the structure in Example 1, in which the upper layer of concrete is poured from bottom to top inside the twisted waist-shaped steel pipe using the jacking method, up to the top horizontal partition. Figure 10 This is a schematic diagram of the structure in Example 1, showing the concrete pouring density on the upper surface of the intermediate layer horizontal partition plate observed through an endoscopic grouting pipe. Figure 11 This is a schematic diagram of the structure in Example 1, in which an upper oblique steel pipe is installed on a twisted waist-shaped steel pipe and concrete is poured onto the upper oblique steel pipe using the high-throw method. Figure 12 This is a top view of the structure with ventilation holes in the horizontal partition. Figure 13 This is a schematic diagram of a structure with unblocking holes in a vertical partition. Figure 14 This is a schematic diagram of the structure of an endoscope; Figure 15 This is a schematic diagram of the structure of the third and fourth pre-embedded pump pipes symmetrically embedded in the lower oblique steel pipe of the twisted waist-shaped steel pipe in Example 2. Figure 16 This is a schematic diagram of the structure in Example 2, in which concrete is poured synchronously from bottom to top along the lower oblique steel pipe using the jacking method to the top of the bottom horizontal partition inside the twisted waist-shaped steel pipe; Figure 17 This is a schematic diagram of the structure used in Example 2 to observe the concrete compaction at the junction of the upper surface of the bottom horizontal partition and the upper surface of the vertical partition through an endoscopic grouting pipe. Figure 18 This is a schematic diagram of the structure of the endoscope grouting pipe pre-embedded in the twisted waist-shaped steel pipe in Example 2; Figure 19This is a schematic diagram of the structure in Example 2 where concrete is poured from bottom to top inside a twisted waist-shaped steel pipe using a jacking method until it reaches above the top horizontal partition. Figure 20 This is a schematic diagram of the structure used in Example 2 to observe the concrete pouring density on the upper surface of the intermediate layer horizontal partition through an endoscopic grouting pipe. Figure 21 This is a schematic diagram of the structure in Example 2, in which an upper oblique steel pipe is installed on a twisted waist-shaped steel pipe and concrete is poured onto the upper oblique steel pipe using the high-throw method. Figure 22 This is a schematic diagram of the elevation structure of the grouting pipe fitting pre-embedded in the twisted waist-shaped steel pipe in Example 3; Figure 23 This is a schematic diagram of the planar structure showing the distribution relationship between the horizontal partition and the grouting pipe fittings in Example 3; Figure 24 This is a flowchart of the method for pouring concrete for obliquely intersecting grid-shaped steel pipe structures; As shown in the figure: 1. Oblique grid irregular cross steel pipe concrete structure; 2. Twisted waist-shaped steel pipe; 3. Lower oblique steel pipe; 4. Upper oblique steel pipe. 101. First pouring hole; 102. First embedded pump pipe; 103. Shut-off valve; 104. Three-way pumping pipe; 105. Concrete; 106. Bottom layer horizontal partition; 107. Flow hole; 108. Latex layer; 109. First endoscopic grouting pipe; 110. Vertical partition; 111. Second endoscopic grouting pipe; 112. Intermediate layer horizontal partition; 113. Second pouring hole; 114. Top layer. Horizontal partition, 115, observation hole, 116, ventilation hole, 117, unblocking hole, 118, third pre-embedded pump pipe, 119, fourth pre-embedded pump pipe, 120, double-layer sleeve, 121, camera, 122, grouting channel, 123, grout outlet, 124, second pre-embedded pump pipe, 125, elbow pipe, 126, grouting fittings, 127, grouting rigid pipe, 128, grouting hose, 129, central through hole. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0021] Example 1

[0022] Please refer to Figure 24 This invention provides a method for casting a diagonally intersecting grid of irregularly shaped steel pipe concrete structure, comprising: Step S1 involves the pre-embedding of the first and second pre-embedded pump pipes and the second endoscopic grouting pipe. Specifically: Two symmetrically distributed first casting holes 101 are made on the lower oblique steel pipe 3 near the intersection of the twisted waist-shaped steel pipe 2. Two first pre-embedded pump pipes 102 with their openings facing downwards are symmetrically pre-embedded in the lower oblique steel pipe 3 through the first casting holes 101. Two symmetrically distributed second casting holes 113 are made on the two limb pipes of the twisted waist-shaped steel pipe 2 between the bottom layer and the upper layer horizontal partitions. Two second pre-embedded pump pipes 124 with their openings facing downwards are symmetrically pre-embedded in the twisted waist-shaped steel pipe 2 through the second casting holes 113. A second endoscopic grouting pipe 111 is pre-embedded in the two limb pipes of the twisted waist-shaped steel pipe 2, so that the second endoscopic grouting pipe 111 is aligned with the junction of the upper surface of the horizontal partition 112 and the vertical partition 110 of each intermediate layer, such as... Figure 4 and Figure 8 As shown.

[0023] Step S2: Pour concrete using the jacking method up to the bottom horizontal partition slab. Specifically: Connect the two first pre-embedded pump pipes 102 to the three-way pumping pipe 104 via the shut-off valve 103. Open the shut-off valve 103, and use a jacking method to simultaneously pour concrete 105 from bottom to top onto the lower oblique steel pipe 3 through the concrete pumping equipment connected to the three-way pumping pipe 104, up to the pre-reserved flow hole 107 above the bottom horizontal partition 106 of the twisted waist-shaped steel pipe 2. Stop pouring, close the shut-off valve 103, remove the three-way pumping pipe 104, and seal the first pouring hole 101. Figures 4 to 6 As shown. The shut-off valve 103 is located on the outside of the twisted waist-shaped steel pipe 2. After the shut-off valve 103 is removed, the first pouring hole 101 is exposed. The first pouring hole 101 can be sealed by welding with a metal plate. The shut-off valve 103 can determine the pumping volume of concrete after pouring, allowing for the early removal of the three-way pumping pipe 104. The twisted waist-shaped steel pipe 2 is located at the intersection of the oblique grid irregular cross-shaped steel pipe concrete structure 1, as shown... Figure 1 As shown; the number of horizontal baffles inside the twisted waist-shaped steel pipe 2 can be increased or decreased as needed, such as Figures 2 to 4 As shown.

[0024] Step S3: Clean the laitance at the bottom horizontal partition. Specifically: After the concrete has initially set, a long-handled tool such as a shovel, chisel, or brush is used to clean the laitance layer 108 on the bottom horizontal partition 106 through the open top of the twisted waist-shaped steel pipe 2. Then, the laitance residue is flushed out through the flow hole 107 by water. Figures 6 to 7 As shown. In step S3, the method further includes using the first endoscope grouting tube 109 to extend from the flow hole 107 into the twisted waist-shaped steel pipe 2 to observe whether the laitance layer 108 inside is clean; if it is not clean, step S3 is repeated; if it is clean, step S4 is executed.

[0025] Step S4: Monitoring and treatment of the cavity at the junction of the bottom horizontal and vertical partitions. Specifically: By inserting the first endoscopic grouting pipe 109 through the pre-reserved flow hole 107 above the bottom horizontal partition 106, it is observed whether there is a cavity at the junction of the bottom horizontal partition 106 and the vertical partition 110 inside the twisted waist-shaped steel pipe 2. If a cavity exists, it is determined that the concrete density is insufficient; otherwise, it is determined that the concrete density meets the requirements. When a cavity exists, a high-pressure grouting pump is connected to the first endoscopic grouting pipe 109 to supplement the cavity with grout to ensure the concrete density at the junction of the bottom horizontal partition 106 and the vertical partition 110. When no cavity exists, the flow hole 107 is sealed. Figure 7 As shown. The first endoscopic grouting tube 109 includes a double-layered sleeve 120 with a cavity and a camera 121 at its top. The cavity of the double-layered sleeve 120 is a grouting channel 122. A grout outlet 123, communicating with the grouting channel 122, is provided on the outer tube of the double-layered sleeve 120 near the camera 121. Figure 14 As shown.

[0026] Step S5: Pour concrete using the jacking method up to the top horizontal partition. Specifically: Connect the two second pre-embedded pump pipes 124 to the three-way pumping pipe 104 via the shut-off valve 103. Open the shut-off valve 103, and use the jacking method to continue synchronously pouring concrete into the two limbs of the twisted waist-shaped steel pipe 2 through the concrete pumping equipment connected to the three-way pumping pipe 104, up to the pre-reserved flow hole 107 above the top horizontal partition 114. Stop pouring, close the shut-off valve 103, remove the three-way pumping pipe 104, and seal the second pouring hole 113. Figure 9 As shown. The installation of the shut-off valve 103 can be referenced to the first pre-embedded pump pipe 102.

[0027] Step S6: Clean the laitance at the top horizontal partition. Specifically: After the concrete has initially set, the laitance layer 108 on the top horizontal partition 114 is cleaned using the method in step S3. Figure 9 The example illustrates the situation after the laitance layer 108 on the top horizontal partition 114 has been cleaned.

[0028] Step S7: Monitoring and treatment of the cavity at the junction of the top-level horizontal and vertical partitions. Specifically: By inserting the first endoscopic grouting pipe 109 through the pre-reserved flow hole 107 above the top horizontal partition 114, observe whether there is a cavity at the junction of the top horizontal partition 114 and the vertical partition 110 inside the twisted waist-shaped steel pipe 2. If a cavity exists, it is determined that the concrete density is insufficient; otherwise, it is determined that the concrete density meets the requirements. If a cavity exists, supplement the cavity with grout by connecting a high-pressure grouting pump through the first endoscopic grouting pipe 109 to ensure the concrete density at the junction of the top horizontal partition 114 and the vertical partition 110. If no cavity exists, seal the flow hole 107. Refer to the diagram at the bottom horizontal partition 106 for the relationship.

[0029] Step S8 involves monitoring and treating the cavity at the junction of the middle horizontal baffle and the pipe wall, as well as the vertical baffle. Specifically: By inserting a first endoscopic grouting pipe 109 through observation holes 115 on the outer wall of the twisted waist-shaped steel pipe 2 above each intermediate layer horizontal partition 112, it is observed whether there is a cavity at the junction of the intermediate layer horizontal partition 112 and the pipe wall of the twisted waist-shaped steel pipe 2. If a cavity exists, a high-pressure grouting pump is connected to the first endoscopic grouting pipe 109 to supplement grouting into the cavity, so as to ensure the compactness of the concrete pouring at the junction of the intermediate layer horizontal partition 112 and the vertical partition 110. If no cavity exists, the observation hole 115 is sealed. A second endoscopic grouting pipe 111 is pre-embedded to observe whether there is a cavity at the junction of the intermediate layer horizontal partition 112 and the vertical partition 110. If a cavity exists, a high-pressure grouting pump is connected to the second endoscopic grouting pipe 111 to supplement grouting into the cavity, so as to ensure the compactness of the concrete pouring at the junction of the intermediate layer horizontal partition 112 and the vertical partition 110. Figure 10 As shown. When a cavity exists, it is determined that the concrete pouring density at the corresponding interface is insufficient; otherwise, it is determined that the concrete pouring density meets the requirements. The second endoscopic grouting tube 111 has the same structure as the first endoscopic grouting tube 109.

[0030] Through steps S1 to S8, the concrete pouring quality inside the twisted waist-shaped steel pipe 2 at the intersection node can be improved, avoiding the problem of insufficient concrete density caused by the influence of the horizontal and vertical partitions 110 on the twisted waist-shaped steel pipe 2.

[0031] To facilitate rapid casting of the upper oblique steel pipe 4 at node 2 of the tortuous waist-shaped steel pipe, the following may also be included: Step S9: Pour concrete using the high-throw method into the upper oblique steel pipe. Specifically: Upper oblique steel pipes 4 are installed above the two limbs of the twisted waist-shaped steel pipe 2. A three-way pumping pipe 104 connected to an elbow pipe 125 is inserted into the upper oblique steel pipes 4 installed on the twisted waist-shaped steel pipe 2 and connected to a concrete pumping device. The concrete pumping device is started, and concrete is simultaneously poured into the two upper oblique steel pipes 4 using a high-throw method. That is, the high-throw method pours concrete to cover the twisted waist-shaped steel pipe 2 and the upper oblique steel pipes 4. Figure 11 As shown. Among them, elbow pipe 125 can be a 90-degree elbow pipe.

[0032] To improve the pouring quality of concrete inside the twisted waist-shaped steel pipe 2 and avoid insufficient concrete density, the concrete pouring method for the oblique grid irregular cross steel pipe concrete structure provided in this embodiment of the invention involves opening several ventilation holes 116 around the central hole of each layer of horizontal partition before pouring concrete inside the twisted waist-shaped steel pipe 2. Figure 12 As shown. When pouring concrete into the twisted waist-shaped steel pipe 2 using the jacking method through the vent holes 116, the concrete slurry can permeate or vent through the vent holes 116, thereby improving the concrete pouring quality at the joints of the horizontal partitions of each layer and avoiding the problem of insufficient concrete density caused by cavities.

[0033] To improve the pouring quality of the two limb pipes within the twisted waist-shaped steel pipe 2, the concrete pouring method for the obliquely intersecting grid irregularly shaped steel pipe structure provided in this embodiment of the invention includes unblocking holes 117 on the vertical partition plate 110, such as... Figure 13 As shown. The unblocking hole 117 allows the concrete slurry poured into the two limb pipes inside the twisted waist-shaped steel pipe 2 to permeate each other or to release air, thus avoiding the problem of insufficient concrete density caused by cavities in the two limb pipes.

[0034] In order to achieve the purpose of supplementing grouting in the cavity, the method for pouring oblique grid irregular cross steel pipe concrete structure provided in this embodiment of the invention can use an endoscope without grouting function to replace the first endoscope grouting tube 109 in steps S4, S7 and S8. That is, a simple or conventional endoscope is used to observe whether there is a cavity. When there is a cavity, the endoscope without grouting function is pulled out and the grouting tube is inserted to supplement grouting in the cavity.

[0035] The method for pouring concrete into an obliquely intersecting grid-shaped steel pipe concrete structure provided in this embodiment of the invention connects to a concrete pumping device via a first pre-embedded pump pipe 102 and a three-way pumping pipe 104. A jacking method is used to simultaneously pour concrete layer by layer from bottom to top into the pre-reserved flow holes 107 above the bottom and top horizontal partitions within the twisted waist-shaped steel pipe 2. This ensures the filling effect of the concrete density on the lower surface of each layer of horizontal partitions and controls the elevation of each layer of pouring. The first endoscopic grouting pipe 109 is used to observe whether the junction of the bottom and top horizontal partitions with the vertical partitions 110 and the upper surface of the twisted waist-shaped steel pipe 2 is... If a cavity exists, the second endoscopic grouting pipe 111 is used to observe whether there is a cavity at the junction of the intermediate layer horizontal partition 112 and the vertical partition 110, thereby determining whether the concrete pouring density at the corresponding junction meets the requirements. If the concrete pouring density is insufficient, a high-pressure grouting pump is connected to the corresponding first endoscopic grouting pipe 109 or second endoscopic grouting pipe 111 to supplement the grouting of the cavity, so that the concrete density on the upper surface of the horizontal partitions of the bottom layer, intermediate layer and top layer meets the pouring requirements, thereby improving the concrete pouring quality in the twisted waist-shaped steel pipe 2 with horizontal partitions and vertical partitions.

[0036] The method for pouring concrete for oblique grid irregular cross steel pipes provided in this invention removes the laitance layer 108 on the bottom and top horizontal partitions by using a long-handled tool at the opening above the twisted waist-shaped steel pipe 2, and cleans the laitance residue on the bottom and top horizontal partitions by water flushing. Thus, the laitance layer 108 inside the twisted waist-shaped steel pipe 2 is cleaned during layered pouring, overcoming the problem that the high-throw method cannot clean the laitance when pouring concrete into the twisted waist-shaped steel pipe 2.

[0037] The concrete pouring method for oblique grid irregular cross steel pipe structures provided in this invention improves the reliability, stability, and quality of concrete pouring for oblique grid irregular cross steel pipe structures by simultaneously pouring the two limb pipes of the oblique grid irregular cross steel pipe.

[0038] The method for pouring concrete structure with oblique grid irregular cross steel pipes provided in this embodiment of the invention has the following advantages: the flow holes 107 on the twisted waist-shaped steel pipe 2 can, on the one hand, achieve elevation control of the concrete layer pouring, on the other hand, be used to insert the endoscopic grouting pipe 109 to observe the concrete density pouring situation at the junction of the bottom horizontal partition 106, and on the other hand, be used to supplement grouting at the cavity at the junction of the bottom and middle horizontal partitions 112, so as to avoid the problem of insufficient concrete density.

[0039] Example 2

[0040] Please refer to Figures 15 to 21This invention provides a method for casting a diagonally intersecting grid of irregularly shaped steel pipe concrete structures, which is an improvement on Embodiment 1, the difference being: Two third pre-embedded pump pipes 118, with their openings facing upwards, are symmetrically pre-embedded in the lower oblique steel pipe 3 through the first pouring hole 101. These third pre-embedded pump pipes 118 pass through the central through-hole 129 of the bottom horizontal partition 106 within the two limbs of the twisted waist-shaped steel pipe 2 and are positioned above the bottom horizontal partition 106, replacing the first pre-embedded pump pipe 102. Figure 12 and Figure 15 As shown.

[0041] In step S2, the shut-off valve 103 is opened, and the concrete pumping equipment is started using a jacking method to simultaneously pour concrete 105 from bottom to top through the three-way pumping pipe 104 and the third pre-embedded pumping pipe 118 onto the lower oblique steel pipe 3, up to the pre-reserved flow hole 107 above the bottom horizontal partition 106 of the twisted waist-shaped steel pipe 2. Pouring is then stopped, the shut-off valve 103 is closed, the three-way pumping pipe 104 is removed, and the first pouring hole 101 is sealed. Figures 15 to 16 As shown. The third pre-embedded pump pipe 118 can reduce the resistance of concrete pouring from bottom to top and improve the pouring speed.

[0042] Steps S2 to S4 are the same as in Example 1, such as... Figures 17 to 18 As shown.

[0043] Two fourth pre-embedded pump pipes 119 are symmetrically pre-embedded within the two limb pipes of the twisted waist-shaped steel pipe 2 through the second pouring hole 113, so that the vertical conveying pump pipe passes through the central through hole 129 of the top horizontal partition 114 and is located above the top horizontal partition 114, in place of the second pre-embedded pump pipe 124. Figures 15 to 19 As shown.

[0044] In step S5, the three-way pumping pipe 104 is connected to the fourth pre-embedded pumping pipe 119. The concrete pumping equipment is started, and the concrete is poured synchronously through the fourth pre-embedded pumping pipe 119 to the two limbs of the twisted waist-shaped steel pipe 2 using the jacking method, up to the pre-reserved flow hole 107 above the top horizontal partition 114. Pouring is then stopped, the three-way pumping pipe 104 is removed, and the second pouring hole 113 is sealed. Figure 19 As shown. The fourth embedded pump pipe 119 can extend beyond the second pouring hole 113. The third embedded pump pipe 118 and the fourth embedded pump pipe 119 can also be embedded separately. The fourth embedded pump pipe 119 can reduce the resistance of pouring concrete from bottom to top and improve the pouring speed.

[0045] Steps S6 to S7 and S8 are the same as in Embodiment 1, such as... Figures 20 to 21 As shown.

[0046] The pumping pressure for concrete pumped using the jacking method is: P>P1+P2+P3 (1) Where P is the pumping pressure of the jacking method for pumping concrete, P1 is the pressure loss along the flow path of the concrete in the conveying pipeline, P2 is the local pressure loss of the concrete as it passes through the bends and cones of the conveying pipeline, and P3 is the pressure of the concrete in the vertical direction due to gravity.

[0047] Example 3 Please refer to this carefully. Figures 22 to 23 This invention provides a method for pouring a diagonally intersecting grid of irregularly shaped steel pipe concrete structures, which is an improvement on Embodiment 1 or Embodiment 2, the difference being: The second endoscopic grouting tube 111 is replaced by a grouting fitting 126, and this replacement is primarily observed in steps S1 and S7. The grouting fitting 126 includes vertically arranged rigid grouting tubes 127 within the various limbs of the twisted waist-shaped steel pipe 2, and multiple radially distributed flexible grouting tubes 128 connected below each rigid grouting tube 127. Each flexible grouting tube 128 is attached to the lowest intermediate horizontal partition 112 and extends to the inner wall of each limb, extending upwards through the inner wall of each limb to above the top horizontal partition 114. The rigid grouting tubes 127 can be located on the axis of each limb and can be made of metal.

[0048] Supplementary grouting is performed using grouting fitting 126. The grouting rigid pipe 127 of grouting fitting 126 is connected to a high-pressure grouting pump. The high-pressure grouting pump is started to inject high-pressure, high-strength grout into the grouting rigid pipe 127 and each connected grouting hose 128. When grout flows out from the upper end of each grouting hose 128, the high-pressure grouting pump is stopped, and the upper end of each grouting hose 128 is sealed. The high-pressure grouting pump is then restarted to continue grouting the grouting fitting 126. The grout in the grouting hose 128 will then rupture under high pressure and flow out to fill the lowermost intermediate layer horizontal partition 112 and the junction of its pipe wall with the twisted waist-shaped steel pipe 2 and the vertical partition 110. Grouting is then stopped. The grouting hose 128 can be sealed by rope binding or other methods. This means that the technical solution replaces step S7 in Embodiment 1, which involves "observing the junction of the intermediate layer horizontal partition 112 and vertical partition 110 using a pre-embedded second endoscopic grouting pipe 111, and if a cavity exists, supplementing the cavity with grout by connecting a high-pressure grouting pump through the second endoscopic grouting pipe 111 to ensure the compactness of the concrete pouring at the junction of the intermediate layer horizontal partition 112 and vertical partition 110," with the grouting pipe 126 replacing the second endoscopic grouting pipe 111 for observing the presence of cavities and subsequent processing steps; that is, not observing the presence of cavities using the second endoscopic grouting pipe 111.

[0049] The method for pouring concrete for obliquely intersecting grid-shaped steel pipes provided in this invention, through supplementary grouting via grouting fittings 126, ensures that the concrete density at the junctions of the horizontal partitions and the walls of the twisted waist-shaped steel pipe 2, and the vertical partitions 110 within the coverage area meets the requirements, thus avoiding insufficient concrete density. It also ensures that the concrete density at the walls of the twisted waist-shaped steel pipe 2, at the lowest intermediate horizontal partition 112, and at the vertical partitions 110 meets the requirements, avoiding insufficient concrete density, thereby improving the concrete pouring quality of the twisted waist-shaped steel pipe 2 with horizontal and vertical partitions.

[0050] To ensure that the grout inside the grouting hose 128 is uniformly broken and filled in the gaps along its layout path under high pressure, thereby improving the concrete density of the twisted waist-shaped steel pipe 2, the wall thickness of the grouting hose 128 from the downstream end to the upstream end is a gradually thickened structure, and the strength from the downstream end to the upstream end is a gradually stronger change. Under high pressure, the grout inside the grouting hose 128 gradually expands from the downstream end to the upstream end, thus comprehensively filling the gaps along the layout path of the grouting hose 128. This improves the concrete density of the twisted waist-shaped steel pipe 2 at the pipe wall, the lowest intermediate horizontal partition 112, the vertical partition 110, and the junction of each layer of horizontal partitions within the coverage area with the pipe wall and vertical partition 110 of the twisted waist-shaped steel pipe 2.

[0051] To avoid collision and interference between the grouting hose 128 and the vent hole 116, the vent hole 116 and the grouting hose 128 are staggered, such as... Figure 23 As shown. Among them Figure 23 and Figure 12 The dashed line containing the vent 116 indicates the distribution shape of the vent 116. Figure 23 It is Figure 12 The distribution position of the vent holes 116 in the middle was adjusted along the distribution shape line, so that the grouting hose 128 and the vent holes 116 were staggered, ensuring the grouting density of the grouting hose 128 at the junction of the vertical partition 110 and the pipe wall and at the pipe wall.

[0052] This invention is not limited to the specific embodiments described above. Obviously, the embodiments described above are only a part of the embodiments of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this invention are within the scope of protection of this invention. Those skilled in the art can make other modifications and variations to this invention. Therefore, if these modifications and variations of this invention fall within the scope of the claims of this invention, then this invention also intends to include these modifications and variations.

Claims

1. A method for casting a diagonally intersecting grid of irregularly shaped intersecting steel pipe concrete structure, characterized in that, include: Step S1: Two first pre-embedded pump pipes with their openings facing downwards are symmetrically pre-embedded on the lower oblique steel pipe near the twisted waist-shaped steel pipe; two second pre-embedded pump pipes with their openings facing downwards are symmetrically pre-embedded on the two limb pipes between the bottom layer and the upper layer of the twisted waist-shaped steel pipe and the horizontal partition; a second endoscopic grouting pipe is pre-embedded in the two limb pipes of the twisted waist-shaped steel pipe, so that the second endoscopic grouting pipe is aligned at the junction of the upper surface of the horizontal partition and the vertical partition of each intermediate layer; Step S2: Connect the two first pre-embedded pump pipes to the three-way pumping pipe through the shut-off valve. Open the shut-off valve and use the jacking method to simultaneously pour concrete from bottom to top onto the lower oblique steel pipe by connecting the concrete pumping equipment to the three-way pumping pipe. Pour concrete up to the pre-reserved flow hole above the bottom horizontal partition of the twisted waist-shaped steel pipe. Stop pouring, close the shut-off valve, remove the three-way pumping pipe, and seal the first pouring hole. Step S3: After the concrete has initially set, use a long-handled tool to reach into the top opening of the twisted waist-shaped steel pipe to clean the laitance layer on the bottom horizontal partition. Then, flush with water to remove the laitance residue through the flow hole. Step S4: Insert the first endoscope grouting tube through the flow hole to observe whether there is a cavity at the junction of the bottom horizontal partition and the vertical partition inside the twisted waist-shaped steel pipe. If a cavity exists, connect the high-pressure grouting pump through the first endoscope grouting tube to supplement the cavity with grout. If no cavity exists, seal the flow hole. Step S5: Connect the two second pre-embedded pump pipes to the three-way pumping pipe through the shut-off valve, open the shut-off valve, and continue to pour concrete synchronously into the two limb pipes of the twisted waist-shaped steel pipe by using the jacking method through the concrete pumping equipment connected to the three-way pumping pipe to the pre-reserved flow hole above the top horizontal partition. Stop pouring, close the shut-off valve, remove the three-way pumping pipe, and seal the second pouring hole. Step S6: After the poured concrete has initially set, clean the laitance layer on the top horizontal partition using the method in step S3. Step S7: Insert the first endoscope grouting pipe through the pre-reserved flow hole above the top horizontal partition to observe whether there is a cavity at the junction of the top horizontal partition and the vertical partition inside the twisted waist-shaped steel pipe. If there is a cavity, connect the high-pressure grouting pump through the first endoscope grouting pipe to supplement the cavity with grout. If there is no cavity, seal the flow hole. Step S8: Insert the first endoscopic grouting pipe into the observation hole opened on the outer wall of the twisted waist-shaped steel pipe above each intermediate layer horizontal partition to observe whether there is a cavity at the junction of the intermediate layer horizontal partition and the pipe wall of the twisted waist-shaped steel pipe. If a cavity exists, supplement grouting is performed on the cavity through the first endoscopic grouting pipe; if no cavity exists, the observation hole is blocked. Then, observe whether there is a cavity at the junction of the intermediate layer horizontal partition and the vertical partition through the pre-embedded second endoscopic grouting pipe. If a cavity exists, supplement grouting is performed on the cavity through the second endoscopic grouting pipe; if no cavity exists, supplement grouting is not performed.

2. The method for casting a diagonally intersecting grid irregularly shaped steel pipe concrete structure according to claim 1, characterized in that, Also includes: Step S9: Install upper oblique steel pipes above the two limbs of the twisted waist-shaped steel pipe, insert the tee pumping pipe into the upper oblique steel pipe and connect it to the concrete pumping equipment, start the concrete pumping equipment and pour concrete into the two upper oblique steel pipes simultaneously using the high-throw method.

3. The method for casting a diagonally intersecting grid irregularly shaped steel pipe concrete structure according to claim 1, characterized in that, Step S3 also includes using a first endoscopic grouting tube to extend from the flow hole into the twisted waist-shaped steel pipe to observe whether the laitance layer is clean; if it is not clean, repeat step S3; if it is clean, proceed to step S4.

4. The method for casting a diagonally intersecting grid irregularly shaped steel pipe concrete structure according to claim 1, characterized in that, Before pouring concrete into the twisted waist-shaped steel tube, several ventilation holes are made around the central hole of each layer of horizontal partition.

5. The method for casting a diagonally intersecting grid irregularly shaped steel pipe concrete structure according to claim 4, characterized in that, The vertical partition has drainage holes.

6. The method for casting a diagonally intersecting grid irregularly shaped steel pipe concrete structure according to claim 1, characterized in that, The first and second endoscopic grouting tubes have the same structure, both including a double-layered tube with a cavity and a camera at its top. The cavity of the double-layered tube is a grouting channel, and the outer tube of the double-layered tube near the camera is provided with a grout outlet that is connected to the grouting channel.

7. The method for casting a diagonally intersecting grid irregularly shaped steel pipe concrete structure according to claim 1, characterized in that, In steps S4, S7 and S8, an endoscope without grouting function is used to replace the grouting tube of the first endoscope to observe whether there is a cavity. If there is a cavity, the endoscope without grouting function is pulled out and the grouting tube is inserted to supplement the grouting of the cavity.

8. The method for casting a diagonally intersecting grid irregularly shaped steel pipe concrete structure according to claim 1, characterized in that, Also includes: A grouting fitting is used instead of the second endoscope grouting tube. The grouting fitting includes a grouting rigid tube vertically installed in each limb pipe of the twisted waist-shaped steel pipe, and multiple grouting flexible tubes radially distributed below each grouting rigid tube. Each grouting flexible tube is attached to the lowest middle layer horizontal partition and extends to the inner wall of each limb pipe, and extends upward through the inner wall of each limb pipe to the top of the top horizontal partition. Supplementary grouting is performed using grouting pipe fittings. The rigid grouting pipe of the grouting pipe fittings is connected to a high-pressure grouting pump. The high-pressure grouting pump is started to inject high-pressure, high-strength grout into the rigid grouting pipe and each of the connected grouting hoses. When grout flows out from the upper end of each grouting hose, the high-pressure grouting pump is stopped, and the upper end of each grouting hose is sealed. The high-pressure grouting pump is then restarted to continue grouting the grouting pipe fittings. The grout in the grouting hoses will then rupture under high pressure and flow out to fill the junction of the lowest intermediate layer horizontal partition and the pipe wall and vertical partition of the twisted waist-shaped steel pipe. Grouting is then stopped.

9. The method for casting a diagonally intersecting grid irregularly shaped steel pipe concrete structure according to claim 1, characterized in that, In step S1, two third pre-embedded pump pipes with their openings facing upwards are symmetrically pre-embedded in the lower oblique steel pipe through the first casting hole. The third pre-embedded pump pipes pass through the central through hole of the bottom horizontal partition in the two limb pipes of the twisted waist-shaped steel pipe and are located above the bottom horizontal partition, in place of the first pre-embedded pump pipe.

10. The method for casting a diagonally intersecting grid irregularly shaped steel pipe concrete structure according to claim 9, characterized in that, In step S5, two fourth pre-embedded pump pipes are symmetrically pre-embedded in the two limb pipes of the twisted waist-shaped steel pipe through the second casting hole, so that the vertical conveying pump pipe passes through the central through hole of the top horizontal partition and is located above the top horizontal partition, in place of the second pre-embedded pump pipe.

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