A single-sided formwork reinforcement structure for ultra-high shafts

Abstract

This utility model discloses a single-sided formwork reinforcement structure for ultra-high shafts, including a shaft, a cast-in-place pile at the bottom of the shaft, ground anchors on the outer side of the cast-in-place piles, masonry on the inner wall of the shaft, a ring beam on the masonry from bottom to top, wall anchor bars penetrating the surface of the masonry, and a water-stop bolt connected to the end of the wall anchor bar away from the inner wall of the shaft. One end of the water-stop bolt is longitudinally connected in series or extends to the wall anchor bar on the opposite side of the masonry. This utility model, through a composite anchoring system, improves the support of the single-sided formwork through the interaction of multiple anchoring system layers; simultaneously, combined with the ground anchor structure, it effectively distributes the lateral pressure evenly to the ground anchor bars, increasing the overall pull-out resistance by more than 40% compared to traditional ground anchors, and eliminating the need for through-wall bolts, thus avoiding future water seepage problems.

Description

Technical Field

[0001] This utility model relates to the field of building formwork installation, and in particular to a single-sided formwork reinforcement structure for ultra-high shafts. Background Technology

[0002] In the construction of ultra-high shafts, formwork engineering is one of the key aspects. Because shafts are usually located inside buildings with limited space, and in many cases one side of the shaft needs to be constructed simultaneously with the main building structure, or is restricted by existing structures and equipment in the surrounding area, it is impossible to install formwork on both sides of the shaft at the same time, and only single-sided formwork construction can be used.

[0003] In traditional double-sided formwork construction, the two sides of the formwork can be supported by tie bolts to form a stable force system, which can better withstand the lateral pressure during concrete pouring. However, in the construction of single-sided formwork for ultra-high shafts, the formwork is only set on one side of the shaft, lacking direct support from the other side. The formwork support system can only rely on the structure outside the shaft or a specially set support structure to bear the lateral pressure of the concrete, which places extremely high demands on the strength, rigidity and stability of the support system.

[0004] Therefore, in deep foundation pit engineering, when facing ultra-high shaft structures, traditional reinforcement methods with single-sided formwork have the following drawbacks due to limited construction space and high lateral pressure on concrete:

[0005] 1. Insufficient stability: Single-sided formwork relies on ground anchors or steel pipes for support, which can easily cause the support to shift or become unstable due to lateral pressure.

[0006] 2. Poor waterproofing performance: Through-wall bolts can easily create water seepage channels, affecting the durability of the structure;

[0007] 3. Low construction efficiency: After the formwork is removed, the anchor points need to be repaired a second time, which affects the continuity of the waterproof layer of the pool and increases the construction period by more than 30%.

[0008] Therefore, to address the above problems, a single-sided template reinforcement structure for ultra-high shafts is provided. Utility Model Content

[0009] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a single-sided template reinforcement structure for ultra-high shafts.

[0010] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0011] This utility model relates to a single-sided formwork reinforcement structure for an ultra-high shaft, comprising a shaft, a cast-in-place pile at the bottom of the shaft, ground anchors on the outer side of the cast-in-place piles, masonry on the inner wall of the shaft, a ring beam on the masonry from bottom to top, wall anchor bars penetrating the surface of the masonry, a water-stop screw rod connected to the end of the wall anchor bar away from the inner wall of the shaft, and one end of the water-stop screw rod being longitudinally connected in series or extended to the wall anchor bar on the opposite side of the masonry; double steel pipes are provided on both sides of the water-stop screw rod, a single steel pipe is provided inside the double steel pipe, and a formwork is provided inside the single steel pipe; multiple formworks are spliced ​​together, leaving a pouring space between the formwork and the masonry, and water-stop plates are provided at the upper and lower parts of the pouring space, the water-stop plates being used to block the seepage path of the gaps.

[0012] Preferably, a double steel pipe is installed between the water-stop screw and the single steel pipe, and the double steel pipes are arranged symmetrically at the top and bottom; the double steel pipes and the water-stop screw are on the same plane and perpendicular to each other.

[0013] Preferably, the single steel pipe is vertically arranged and located on the outer surface of the template.

[0014] Preferably, the water-stop screws are arranged at equal intervals on the template surface, and the wall anchor bars are spaced apart to correspond to the water-stop screws. The wall anchor bars are set at equal intervals, and the error does not exceed 50mm.

[0015] Preferably, the template is made of thick plywood, and the water-stop bolt is welded to the wall anchor bar.

[0016] Preferably, the ground anchor rods are installed at 1-meter intervals along the cast-in-place piles, with an anchoring depth of ≥10d, and the exposed portion is welded to the water-stop bolts.

[0017] Preferably, the template thickness is 15mm, the single steel pipe is Φ48.3mm, and the double steel pipe is Φ48.3mm.

[0018] Preferably, the bottom of the wellbore is also provided with a padding layer, and the joints of the template are sealed with sponge strips.

[0019] Preferably, the ring beams are arranged proportionally from bottom to top, and the height of the template is the distance between the ring beams or the distance between the ring beam and the subbase.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This invention utilizes a composite anchoring system, through the interaction of multiple anchoring system layers, to significantly improve the support of single-sided formwork. Simultaneously, combined with a ground anchor structure, it effectively distributes the lateral pressure evenly to the ground anchor rods, increasing the overall pull-out resistance by more than 40% compared to traditional ground anchors. Furthermore, it eliminates the need for through-wall bolts, thus avoiding future water seepage problems. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a casting diagram of the bottom ring beam of the overall structure of this utility model;

[0024] Figure 2 This is a casting diagram of the central ring beam of the overall structure of this utility model;

[0025] Figure 3 This is a casting diagram of the upper ring beam of the overall structure of this utility model;

[0026] In the diagram: 1. Shaft; 2. Masonry; 3. Ring beam; 4. Wall anchor bar; 5. Water-stop bolt; 6. Double steel pipe; 7. Single steel pipe; 8. Formwork; 9. Water-stop plate. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] In the attached diagram, all identical reference numerals refer to the same components.

[0029] Example 1

[0030] like Figure 1-3 As shown, this utility model provides a single-sided template reinforcement structure for an ultra-high shaft, including a shaft 1, a cast-in-place pile at the bottom of the shaft 1, the cast-in-place pile including a ground anchor rod, a masonry 2 on the inner wall of the shaft 1, a ring beam 3 from bottom to top on the masonry 2, a wall anchor bar 4 penetrating the surface of the masonry 2, a water-stop screw rod 5 connected to one end of the wall anchor bar 4 away from the inner wall of the shaft 1, and one end of the water-stop screw rod 5 being longitudinally connected in series or extended to the wall anchor bar 4 on the opposite side.

[0031] The end of the water-stop screw 5 facing the wall anchor bar 4 is provided with a double steel pipe 6, the inner side of the double steel pipe 6 is provided with a single steel pipe 7, the inner side of the single steel pipe 7 is provided with a template 8, and multiple templates 8 are spliced ​​together. There is a pouring space between the template 8 and the masonry 2, and water-stop plates 9 are provided at the top and bottom of the pouring space. The water-stop plates 9 are used to block the seepage path of the gap.

[0032] A double steel pipe 6 is installed between the water-stop screw rod 5 and the single steel pipe 7, and the double steel pipe 6 is arranged symmetrically from top to bottom; the double steel pipe 6 and the water-stop screw rod 5 are on the same plane and perpendicular to each other.

[0033] The single steel pipe 7 is set vertically and is located on the outer surface of the template 8.

[0034] Water-stop screws 5 are arranged at equal intervals on the surface of template 8, and wall anchor bars 4 are spaced out to correspond to the water-stop screws 5. The wall anchor bars 4 are set at equal intervals, and the error does not exceed 50mm.

[0035] Template 8 is made of thick plywood, and the water-stop screw 5 is welded to the wall anchor bar 4.

[0036] Ground anchors are installed at 1-meter intervals along the cast-in-place piles, with an anchoring depth of ≥10d. The exposed portion is welded to the water-stop bolt 5.

[0037] The template 8 is 15mm thick, the single steel pipe 7 is Φ48.3mm, and the double steel pipe 6 is Φ48.3mm.

[0038] The bottom of the shaft 1 is also provided with a padding layer, and the joints of the template 8 are sealed with sponge strips.

[0039] The ring beams 3 are set proportionally from bottom to top, and the height of the template 8 is the distance between the ring beams 3 or the distance between the ring beams 3 and the subbase.

[0040] Specifically, the structural technical solution of this utility model is divided into three different systems, namely:

[0041] Support frame: The main beam and secondary beam structure, composed of double steel pipes 6 and single steel pipes 7, mainly supports the overall assembled formwork 8. During the construction process, the ground anchor rods located at the bottom mainly provide support at the bottom. Together with the masonry 2 on the side and the wall anchor bar 4 extending from the masonry 2 to the outside, the overall structure has a supporting effect in both vertical and horizontal directions during the initial pouring.

[0042] Ground anchor system: The ground anchor is made of Φ14 threaded steel. The anchor is installed at 1-meter intervals along the cast-in-place pile, with an anchoring depth of ≥10d. The exposed part is connected to the support frame by welding with the water-stop screw 5, so that the bottom can form a good support effect.

[0043] Waterproof and airtight system: Because the reinforcing bolts of the water-stop screw 5 are replaced by welding the water-stop screw 5 to the wall anchor bar 4, there is no need to form an extended groove structure inside after pouring; at the same time, sponge strips are pasted at the joints of the formwork 8, and water-stop plates 9 made of galvanized steel plates are set on the contact surface of the construction joint, such as Figure 1-2 As shown, each stage of the pouring process includes a waterstop plate 9 at the joint.

[0044] When the bottom is poured, the overall finish has two different effects, namely, as Figure 1 As shown, the bottom anchor rod extends upwards to support the water-stop screw rod 5. At this point, the lateral pressure at the bottom is relatively high, so multi-angle support is required. During the middle pouring, since the bottom pouring has already solidified, the upper pouring mainly relies on the connection between the wall anchor bar 4 and the water-stop screw rod 5 for support. Figure 2As shown, the ground anchor rod typically has a middle layer support and a middle anchoring device at the top to support the water-stop bolt 5 in the upper part. Therefore, the actual support force of the ground anchor rod extends the height. At this time, the formwork 8 is not only under tension inside the masonry 2, but also under compression outside the formwork 8 due to the action of the water-stop bolt 5. Moreover, the vertical pouring force is also transferred to the lower poured area rather than to the ground. Therefore, fixing the formwork 8 mainly with the internal and external structures is sufficient to prevent deformation of the formwork 8, and the ground anchor rod only plays an auxiliary role. The uppermost part has the most pouring, such as... Figure 3 As shown, it can be poured again directly using the above method.

[0045] Working principle:

[0046] 1. Lateral pressure transmission: The lateral pressure generated during concrete pouring is transmitted to the double steel pipes 6 through the formwork 8, and then distributed to the wall anchors through the support frame; during bottom pouring, ground anchors can also be used for auxiliary support.

[0047] 2. Displacement control: The principle of forming a closed force ring by the bolt tightening force at both ends of the water-stop screw 5 resists horizontal displacement, providing enhanced lateral displacement resistance to the single steel pipe 7;

[0048] 3. Waterproofing mechanism: Water-stopping sheet 9 and water-stopping screw 5 block the seepage path, and sealant, sponge strip and waterproof membrane form a double protective layer.

[0049] In summary, this utility model achieves the pouring construction of ultra-high shaft 1 from bottom to top by combining multiple systems. When the conventional support function is tested in actual use, the pull-out resistance of this utility model is increased by more than 40% compared with the traditional ground anchor. Especially when pouring in higher areas, it can reduce the reliance on ground anchor support.

[0050] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A super high shaft single-sided formwork reinforcing structure, comprising a shaft, a cast-in-place pile is arranged at the bottom of the shaft, and a ground anchor rod is arranged outside the cast-in-place pile, characterized in that, The inner wall of the shaft is provided with masonry, and the masonry is provided with ring beams from bottom to top. Wall anchor bars are penetrating through the surface of the masonry. A water-stop screw is connected to one end of the wall anchor bar away from the inner wall of the shaft. One end of the water-stop screw bar is longitudinally connected in series or extended to the wall anchor bar on the opposite side of the masonry. The water-stop screw is provided with double steel pipes on both sides, and a single steel pipe is provided inside the double steel pipe. A template is provided inside the single steel pipe. Multiple templates are spliced ​​together, and a pouring space is left between the templates and the masonry. Water-stop plates are provided at the top and bottom of the pouring space. The water-stop plates are used to block the seepage path of the gap.

2. The single-sided template reinforcement structure for ultra-high shafts according to claim 1, characterized in that, A double steel pipe is installed between the water-stop screw and the single steel pipe, and the double steel pipes are arranged symmetrically at the top and bottom; the double steel pipes and the water-stop screw are on the same plane and perpendicular to each other.

3. The single-sided template reinforcement structure for ultra-high shafts according to claim 2, characterized in that, The single steel pipe is set vertically and is located on the outer surface of the template.

4. The single-sided template reinforcement structure for ultra-high shafts according to claim 3, characterized in that, The water-stop screws are arranged at equal intervals on the template surface, and the wall anchor bars correspond to the water-stop screws at intervals. The wall anchor bars are set at equal intervals, and the error does not exceed 50mm.

5. The single-sided template reinforcement structure for ultra-high shafts according to claim 4, characterized in that, The template is made of thick plywood, and the water-stop screw is welded to the wall anchor bar.

6. The single-sided template reinforcement structure for ultra-high shafts according to claim 1, characterized in that, The ground anchor rods are installed at 1-meter intervals along the cast-in-place piles, with an anchoring depth of ≥10d, and the exposed part is welded to the water-stop bolt.

7. The single-sided template reinforcement structure for ultra-high shafts according to claim 5, characterized in that, The template thickness is 15mm, the single steel pipe is Φ48.3mm, and the double steel pipe is Φ48.3mm.

8. The single-sided template reinforcement structure for ultra-high shafts according to claim 7, characterized in that, The bottom of the well is also provided with a padding layer, and the joints of the template are sealed with sponge strips.

9. A single-sided template reinforcement structure for ultra-high shafts according to claim 8, characterized in that, The ring beams are arranged proportionally from bottom to top, and the height of the template is the distance between the ring beams or the distance between the ring beam and the subbase.

Images