Non-drainage sinking open caisson concrete inner supporting formwork structure

Abstract

A non-drainage sinking open caisson concrete inner support formwork structure relates to the technical field of open caisson construction, is arranged in a sinking open caisson, and comprises a horizontal inclined support arranged at the corner position of the side wall of the sinking open caisson, and the inclined support beam and the side wall of the sinking open caisson form a triangular stable structure. An inner supporting bottom die and inner supporting side dies are fixedly laid on the upper surface of the inclined supporting beam in the length direction of the inclined supporting beam, the inner supporting side dies are fixedly arranged on the two sides of the inner supporting bottom die in the width direction in a supported mode, and a formwork space used for pouring concrete is formed between the inner supporting bottom die and the inner supporting side dies. By constructing a stable triangular support system and a fine template system, the problem of construction of the inner support in the open caisson sinking without drainage is effectively solved, the stability of the open caisson in the sinking process and the structural strength of the open caisson after concrete pouring are ensured, the construction efficiency and the engineering quality are remarkably improved, and the construction cost is reduced. And reliable technical support is provided for foundation pit supporting engineering in a complex environment.

Description

Technical Field

[0001] The utility model relates to the technical field of caisson construction, in particular to a concrete inner support formwork structure for a non-drainage sinking caisson. Background Art

[0002] In civil engineering foundation pit excavation and support projects, concrete internal support structures are widely used as an important temporary support measure to stabilize and protect deep and large foundation pits. For conventional foundation pit construction, after the surrounding retaining structures (such as underground continuous walls and SMW piles) are completed, internal support construction is usually carried out in a predetermined sequence to ensure overall stability during the foundation pit excavation process. During this process, the bearing surface of the internal support is often set on the ground, relying on the bearing capacity of the ground to support the weight of the internal support and the various loads it is subjected to.

[0003] However, when the foundation pit project adopts a caisson structure, especially when the caisson construction needs to be carried out without drainage, the construction difficulty of the internal support increases significantly. The construction characteristic of the caisson without drainage is that as the caisson sinks, the pit will be filled with water, which brings many challenges to the construction of the internal support. First, the traditional method of setting up formwork in the pit becomes unfeasible due to the lack of a stable foothold, because the formwork needs to be on solid soil or ground to ensure safety and stability. Secondly, although the suspension method is theoretically feasible, it requires precise control of the position and posture of the internal support to prevent it from deflecting or tilting in the water. Therefore, the construction technology requirements are extremely high. Any negligence may lead to construction quality problems or even cause safety accidents.

[0004] In view of the above technical difficulties, how to effectively construct concrete internal supports in undrained sinking caissons while ensuring that the construction quality meets the requirements of relevant specifications has become a major challenge in the current field of foundation pit support technology. Utility Model Content

[0005] The utility model proposes a concrete inner support formwork structure for a undrained sunken caisson to overcome the shortcomings of the existing technology, improve the safety and efficiency of the concrete inner support construction in the undrained sunken caisson, and ensure the smooth progress of the foundation pit project and the long-term stability of the structure.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A non-drainage sunken caisson concrete internal support formwork structure is arranged in the sunken caisson, including an inclined support beam with a horizontal diagonal brace arranged at a corner position of the sunken caisson side wall, the inclined support beam and the sunken caisson side wall form a triangular stable structure, the upper surface of the inclined support beam is paved and fixed with an internal support bottom formwork along its length direction, and internal support side formworks are supported and fixed on both sides of the inner support bottom formwork in the width direction, and a template space for pouring concrete is formed between the inner support bottom formwork and the inner support side formwork.

[0008] Furthermore, the inner supporting bottom formwork includes a plurality of transverse square timbers evenly spaced along the length direction of the oblique support beam, and the bottom formwork is laid and fixed on the transverse square timbers.

[0009] Furthermore, the inner supporting side formwork includes side formworks vertically supported on both sides of the bottom formwork in the width direction, and a plurality of pairs of double steel pipes are vertically erected on the opposite sides of the side formworks. Longitudinal square timbers are evenly spaced horizontally between the double steel pipes and the side formworks from top to bottom, and the opposite double steel pipes are fixed by a plurality of groups of tension bolts.

[0010] Furthermore, several groups of tension bolts are tied and fixed along the upper, middle and lower positions of the side formwork.

[0011] Furthermore, the bottom formwork and side formwork adopt wooden formwork with a thickness of 18 mm, the horizontal spacing of the horizontal square timber is 300 mm, the vertical spacing of the longitudinal square timber is 250 mm, the double steel pipes are double steel pipes with a diameter of 48 mm and a wall thickness of 3 mm, the adjacent spacing of the double steel pipes is 300 mm, and the bolt diameter of the tension bolts is 12 mm.

[0012] Furthermore, each group of the inclined support beams includes four I-beams of model 25, which are arranged in parallel with a net spacing of 80 mm between the I-beams, and both ends of the inclined support beams are anchored in the caisson with a thickness of 0.5 times the wall thickness.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The utility model discloses the concrete internal support formwork structure for the undrained sinking caisson, which effectively solves the construction problem of the internal support of the undrained sinking caisson by constructing a stable triangular support system and a sophisticated formwork system, thereby ensuring the stability of the caisson during the sinking process and the structural strength after concrete pouring, significantly improving the construction efficiency and project quality, and providing reliable technical support for foundation pit support projects in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 This is a schematic diagram of the layout structure of the oblique support beam of the utility model;

[0017] Figure 2 This is the main view of the utility model;

[0018] Figure 3 It is a side view of the utility model;

[0019] Figure 4 for Figure 3 A partial enlarged view of

[0020] Figure 5 Schematic diagram of the internal support structure of concrete after pouring. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0023] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0024] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0025] like Figure 1-5 As shown, a non-drainage sunken caisson concrete internal support formwork structure is arranged in the sunken caisson 1, including an inclined support beam 2 with a horizontal diagonal brace arranged at a corner position of the side wall of the sunken caisson 1, and the inclined support beam 2 and the side wall of the sunken caisson 1 form a triangular stable structure. The upper surface of the inclined support beam 2 is paved and fixed with an internal support bottom formwork along its length direction, and internal support side formworks are supported and fixed on both sides of the inner support bottom formwork in the width direction. A template space for pouring concrete is formed between the inner support bottom formwork and the inner support side formwork.

[0026] The inclined support beams 2 and the side walls of the sunken caisson 1 form a triangular stable structure. The triangle is one of the most stable shapes in structural mechanics, which can effectively resist lateral pressure and deformation, and provide a stable support foundation for the entire internal support system.

[0027] Specifically, as shown in the figure, the inner support bottom formwork includes a plurality of transverse timbers 3 evenly spaced along the length of the diagonal support beam 2, with a bottom formwork 4 laid and fixed on top of the transverse timbers 3. The inner support side formwork includes side formworks 5 vertically supported on both sides of the width of the bottom formwork 4. Several pairs of double steel tubes 6 are vertically installed on opposite sides of the side formworks 5. Longitudinal timbers 7 are evenly spaced horizontally between the double steel tubes 6 and the side formworks 5 from top to bottom. The opposing double steel tubes 6 are secured together by several sets of tension bolts 8. These sets of tension bolts 8 are secured along the top, middle, and bottom of the side formworks 5.

[0028] Among them, the inner support bottom formwork is composed of horizontal square wood 3 and bottom template 4, which are laid and fixed along the length direction of the inclined support beam 2 to form a stable bottom support platform.

[0029] The inner support side formwork consists of side formwork 5, double steel tubes 6, longitudinal timbers 7, and tension bolts 8. It is vertically supported on both sides of the bottom formwork 4, forming a sturdy sidewall formwork system. Longitudinal timbers 7 are placed between the side formwork 5 and the double steel tubes 6, and are secured with tension bolts 8 to ensure the overall rigidity and stability of the formwork system.

[0030] The tension bolts 8 are tied and fixed along the upper, middle and lower positions of the side formwork 5, which effectively limits the outward expansion and deformation of the side formwork 5 during the concrete pouring process, and ensures the overall stability and accuracy of the formwork system.

[0031] Specifically, as shown in the figure, the bottom formwork 4 and the side formwork 5 are wooden formworks with a thickness of 18 mm, the horizontal spacing of the horizontal square timbers 3 is 300 mm, the vertical spacing of the longitudinal square timbers 7 is 250 mm, the double steel pipes 6 are double steel pipes with a diameter of 48 mm and a wall thickness of 3 mm, the adjacent spacing between the double steel pipes is 300 mm, and the bolt diameter of the tension bolts 8 is 12 mm.

[0032] Specifically, as shown in the figure, each group of the inclined support beams 2 includes four I-beams of model 25, which are arranged in parallel with a net spacing of 80 mm between the I-beams. Both ends of the inclined support beams 2 are anchored into the caisson with a thickness of 0.5 times the wall thickness.

[0033] The utility model discloses the concrete internal support formwork structure for the undrained sinking caisson, which effectively solves the construction problem of the internal support of the undrained sinking caisson by constructing a stable triangular support system and a sophisticated formwork system, thereby ensuring the stability of the caisson during the sinking process and the structural strength after concrete pouring, significantly improving the construction efficiency and project quality, and providing reliable technical support for foundation pit support projects in complex environments.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0035] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A non-drained sunken caisson concrete internal support formwork structure, arranged in the sunken caisson (1), characterized in that: The invention comprises an inclined support beam (2) with a horizontal diagonal brace arranged at a corner position of a side wall of a sunken caisson (1); the inclined support beam (2) and the side wall of the sunken caisson (1) form a triangular stable structure; an inner support bottom formwork is laid and fixed on the upper surface of the inclined support beam (2) along its length direction, and inner support side forms are supported and fixed on both sides of the inner support bottom formwork in the width direction; a template space for pouring concrete is formed between the inner support bottom formwork and the inner support side forms.

2. The concrete inner support formwork structure for a non-drained sunken caisson according to claim 1, characterized in that: The inner support bottom formwork comprises a plurality of transverse square timbers (3) evenly spaced along the length direction of the oblique support beam (2), and a bottom formwork (4) is laid and fixed on the transverse square timbers (3).

3. The concrete inner support formwork structure for a non-drained sunken caisson according to claim 2, characterized in that: The inner supporting side formwork comprises side formwork (5) vertically supported on both sides of the bottom formwork (4) in the width direction, a plurality of pairs of double steel pipes (6) are vertically arranged on the opposite side of the side formwork (5), longitudinal square timbers (7) are evenly spaced horizontally between the double steel pipes (6) and the side formwork (5) from top to bottom, and the opposite double steel pipes (6) are fastened together by a plurality of groups of tension bolts (8).

4. The concrete inner support formwork structure for a non-drained sunken caisson according to claim 3, characterized in that: Several groups of tension bolts (8) are tied and fixed along the upper, middle and lower positions of the side formwork (5).

5. The concrete inner support formwork structure for a non-drainage sunken caisson according to claim 4, characterized in that: The bottom formwork (4) and side formwork (5) are made of wooden formwork with a thickness of 18 mm. The horizontal spacing of the horizontal square timbers (3) is 300 mm. The vertical spacing of the longitudinal square timbers (7) is 250 mm. The double steel pipes (6) are double steel pipes with a diameter of 48 mm and a wall thickness of 3 mm. The adjacent spacing of the double steel pipes is 300 mm. The bolt diameter of the tension bolts (8) is 12 mm.

6. The concrete inner support formwork structure for a non-drainage sunken caisson according to claim 5, characterized in that: Each group of the oblique support beams (2) includes four I-beams of model 25, which are arranged in parallel with a net spacing of 80 mm between the I-beams. Both ends of the oblique support beams (2) are anchored into the caisson at 0.5 times the wall thickness.

Images