阅读说明：本技术 箱拱形波纹钢通道抗上浮的复合基础结构及施工方法 (Composite foundation structure with anti-floating box arch corrugated steel channel and construction method ) 是由 战福军 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种箱拱形波纹钢通道抗上浮的复合基础结构及施工方法,其中复合基础结构自下而上依次包括地基基础、钢筋混凝土垫层及由预拌流态自密实固化土形成的固化土充填层。固化土充填层中设有竖向钢筋,竖向钢筋的上端与箱拱形波纹钢通道的底板固定连接,竖向钢筋的下端与钢筋混凝土垫层中的钢筋网固定连接。通过本发明公开的箱拱形波纹钢通道的施工方法,可以实施出具有上述复合基础结构的箱拱形波纹钢通道,固化土充填层及钢筋混凝土垫层通过竖向钢筋与箱拱形波纹钢通道的底板连接,成为箱拱形波纹钢通道的配重,抵抗来自地下水的上浮力的同时,无需改变通道连接后形成的管廊内部的地平面标高,拓宽了波纹钢结构的应用场景。(The invention discloses a composite foundation structure for resisting upward floating of a box arch corrugated steel channel and a construction method, wherein the composite foundation structure sequentially comprises a foundation, a reinforced concrete cushion layer and a solidified soil filling layer formed by premixed flow state self-compacting solidified soil from bottom to top. Vertical steel bars are arranged in the solidified soil filling layer, the upper ends of the vertical steel bars are fixedly connected with the bottom plate of the box arch-shaped corrugated steel channel, and the lower ends of the vertical steel bars are fixedly connected with a steel bar mesh in the reinforced concrete cushion layer. By the construction method of the box arch-shaped corrugated steel channel, the box arch-shaped corrugated steel channel with the composite foundation structure can be implemented, the solidified soil filling layer and the reinforced concrete cushion layer are connected with the bottom plate of the box arch-shaped corrugated steel channel through the vertical steel bars to form the counter weight of the box arch-shaped corrugated steel channel, the counter weight resists the upward buoyancy from underground water, meanwhile, the ground level inside a pipe gallery formed after the channel is connected does not need to be changed, and the application scene of the corrugated steel structure is widened.)

1. The utility model provides a compound foundation structure of anti come-up of case arch corrugated steel passageway, sets up in the bottom of case arch corrugated steel passageway, its characterized in that includes foundation basis, reinforced concrete bed course (100) and solidified soil filling layer (120) that form by ready-mixed flow state self-compaction solidified soil from bottom to top in proper order, be equipped with vertical reinforcing bar (130) in solidified soil filling layer (120), the upper end of vertical reinforcing bar (130) and the bottom plate fixed connection of case arch corrugated steel passageway (200), the lower extreme of vertical reinforcing bar (130) with reinforcing bar net (110) fixed connection in reinforced concrete bed course (100).

2. The box arch-shaped corrugated steel channel anti-uplift composite foundation structure as claimed in claim 1, wherein the width of the reinforced concrete cushion layer (100) is larger than the span of the box arch-shaped corrugated steel channel.

3. The box-arch-shaped corrugated steel channel anti-floating composite foundation structure as claimed in claim 1, wherein the upper ends of the vertical reinforcing steel bars (130) are connected to both ends of the bottom plate of the box-arch-shaped corrugated steel channel (200) side by side in the longitudinal direction.

4. The box-arch corrugated steel channel anti-floating composite foundation structure of claim 1, wherein the strength of the solidified soil pack (120) is not less than 0.4 Mpa.

5. The box-arch corrugated steel channel anti-floating composite foundation structure according to claim 1, wherein the solidified soil filling layer (120) is submerged at both ends of the bottom plate of the box-arch corrugated steel channel (200).

6. The anti-floating composite foundation structure of the box-arch-shaped corrugated steel channel according to claim 1, wherein the vertical steel bars (130) are hot-galvanized steel bars.

7. A construction method of a box arch corrugated steel channel is characterized by comprising the following steps:

step S100: digging a certain depth downwards under the depth of the foundation pit of the normal foundation, and arranging a reinforced concrete cushion layer (100) at the bottom of the foundation pit by using concrete and a reinforcing mesh (110);

step S200: connecting vertical steel bars (130) to a steel bar mesh (110) in the reinforced concrete cushion layer (100), wherein the upper ends of the vertical steel bars (130) are higher than the reinforced concrete cushion layer (100) by a certain height;

step S300: after the reinforced concrete cushion (100) is solidified, placing the box arch-shaped corrugated steel channel (200) on a cushion block or a pipe pillow on the reinforced concrete cushion (100), adjusting the height of the box arch-shaped corrugated steel channel (200) to reach a designed elevation through the cushion block or the pipe pillow, and then fixedly connecting a bottom plate of the box arch-shaped corrugated steel channel (200) with the vertical steel bars (130);

step S400: filling premixed flow-state self-compacting solidified soil into a gap between a bottom plate of the box arch-shaped corrugated steel channel (200) and the reinforced concrete cushion (100) until the height of the flow-state solidified soil is flush with the two ends of the bottom plate of the box arch-shaped corrugated steel channel (200) to form a solidified soil filling layer (120);

step S500: and after the solidified soil filling layer (120) is solidified, backfilling materials are filled back to the two sides of the box arch-shaped corrugated steel channel (200) until the foundation pit is filled and leveled.

8. The method for constructing a box arch-shaped corrugated steel channel as claimed in claim 7, wherein the ready-mixed fluid state self-compacting solidified soil in the step S400 is made of spoil, water and a curing agent generated when a foundation pit is excavated.

Technical Field

The invention relates to the field of box culvert, in particular to a composite foundation structure for resisting floating of a box arch corrugated steel channel and a construction method.

Background

The utility tunnel of corrugated steel construction underground is lighter than the piping lane of concrete structure weight a lot, often faces the problem that groundwater buoyancy leads to the structure come-up, especially when the soil layer thickness on piping lane upper portion is not enough to offset the buoyancy that groundwater produced. In some cases it is allowed to bury the pipe gallery deeply in order to resist the structure floating upwards, but at this time the function of the pipe gallery is impaired, especially when the pipe gallery is contained as a drainage box for drainage.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a composite foundation structure for resisting upward floating of a box arch corrugated steel channel, which can resist the upward buoyancy of underground water under the condition of not deeply burying a pipe gallery.

The invention also aims to provide a construction method of the box arch corrugated steel channel, which can realize the composite foundation structure.

The technical scheme is as follows: the invention relates to an anti-floating composite foundation structure of a box arch-shaped corrugated steel channel, which is arranged at the bottom of the box arch-shaped corrugated steel channel and is characterized by sequentially comprising a foundation, a reinforced concrete cushion layer and a solidified soil filling layer formed by premixed flow state self-compacting solidified soil from bottom to top, wherein vertical steel bars are arranged in the solidified soil filling layer, the upper ends of the vertical steel bars are fixedly connected with a bottom plate of the box arch-shaped corrugated steel channel, and the lower ends of the vertical steel bars are fixedly connected with a steel bar mesh in the reinforced concrete cushion layer.

Further, the width of the reinforced concrete cushion layer is larger than the span of the box arch-shaped corrugated steel channel.

Furthermore, the upper ends of the vertical steel bars are connected to two ends of the bottom plate of the box arch-shaped corrugated steel channel side by side.

Further, the strength of the solidified soil filling layer is not less than 0.4 MPa.

Further, the solidified soil filling layer is submerged at two ends of the bottom plate of the box arch-shaped corrugated steel channel.

Further, the vertical steel bars are hot-galvanized steel bars.

The invention relates to a construction method of a box arch corrugated steel channel, which comprises the following steps:

step S100: digging a certain depth downwards under the depth of the foundation pit of the normal foundation, and arranging a reinforced concrete cushion layer at the bottom of the foundation pit by using concrete and a reinforcing mesh;

step S200: connecting vertical steel bars on a steel bar net in the reinforced concrete cushion layer, wherein the upper ends of the vertical steel bars are higher than the reinforced concrete cushion layer by a certain height;

step S300: after the reinforced concrete cushion is solidified, placing the box arch-shaped corrugated steel channel on a cushion block or a pipe pillow on the reinforced concrete cushion, adjusting the height of the box arch-shaped corrugated steel channel to reach a designed elevation through the cushion block or the pipe pillow, and then fixedly connecting a bottom plate of the box arch-shaped corrugated steel channel with a vertical steel bar;

step S400: filling premixed flow-state self-compacting solidified soil into a gap between a bottom plate of the box arch-shaped corrugated steel channel and a reinforced concrete cushion layer until the height of the flow-state solidified soil is flush with two ends of the bottom plate of the box arch-shaped corrugated steel channel to form a solidified soil filling layer;

step S500: and after the solidified soil filling layer is solidified, backfilling materials to the two sides of the box arch-shaped corrugated steel channel until the foundation pit is filled and leveled.

Further, the premixed fluid self-compacting solidified soil in the step S400 is made of spoil, water and a curing agent generated when the foundation pit is excavated.

Has the advantages that: compared with the prior art, the invention has the following advantages:

1. the solidified soil filling layer, the reinforced concrete cushion layer and the side backfill layer become the balance weight of the pipe gallery, and the upper buoyancy of underground water can be resisted under the condition that the ground level inside the pipe gallery is not changed.

2. By adopting the technical scheme, the corrugated steel structure pipe gallery or the channel can be applied to some engineering projects which are not suitable for the corrugated steel structure pipe gallery or the channel due to anti-floating factors.

3. The solidified soil has low cost, can be made of site engineering waste soil, is recycled and has low cost.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings.

Referring to fig. 1, the composite foundation structure for resisting upward floating of the box-arch-shaped corrugated steel channel according to the embodiment of the invention is arranged at the bottom of the box-arch-shaped corrugated steel channel 200 and sequentially comprises a reinforced concrete cushion 100 and a solidified soil filling layer 120 from bottom to top. The solidified soil filling layer 120 is formed by solidifying pre-mixed flow state self-compacting solidified soil. Vertical steel bars are arranged in the solidified soil filling layer 120, the upper ends of the vertical steel bars 130 are fixedly connected with the bottom of the box arch-shaped corrugated steel channel 200, and the other ends of the vertical steel bars 130 are fixedly connected with the steel bar meshes 130 in the reinforced concrete cushion layer 100.

According to the above technical scheme's anti compound foundation structure that floats of box arch corrugated steel passageway, the bottom plate of passageway passes through vertical reinforcing bar 130 and links into an organic whole with solidified soil filling layer 120 and reinforced concrete cushion 100, and solidified soil filling layer 120 and reinforced concrete cushion 100 can resist the buoyancy that groundwater produced as the counter weight of the piping lane that a plurality of passageway axial splices become. Adopt above-mentioned technical scheme's piping lane need not to bury the piping lane deeply in order to resist the buoyancy that groundwater produced, can not change the inside ground level elevation of piping lane.

Referring to fig. 1, in some embodiments, the vertical reinforcing bars 130 are fixedly connected to the mesh reinforcement 110 closest to the upper surface of the reinforced concrete cushion 100. The plurality of vertical reinforcing steel bars 130 are arranged at two ends of the bottom plate of the box arch-shaped corrugated steel channel 200 in the longitudinal direction, namely, in the channel direction side by side, and the upper ends of the vertical reinforcing steel bars 130 are fixedly connected with two ends of the bottom plate of the channel respectively. In some embodiments, the solidified soil filling layer 120 is submerged over both ends of the channel floor, i.e., the height of both ends of the solidified soil filling layer 120 is higher than that of both ends of the floor of the box-arch corrugated steel channel 200. In some embodiments, the width of the reinforced concrete pad 100 is greater than the span of the arched corrugated steel channel 200 of the box, and the vertical steel bars 130 are preferably galvanized steel bars.

In some embodiments, the strength of the solidified soil pack 120 is not less than 0.4 MPa.

The composite foundation structure with the anti-floating performance for the box arch corrugated steel channel can be implemented by the following construction method:

step S100: digging a certain depth downwards under the depth of the foundation pit of the normal foundation, and arranging a reinforced concrete cushion layer 100 at the bottom of the foundation pit by using concrete and a reinforcing mesh 110;

step S200: connecting vertical steel bars 130 to the steel bar mesh 110 in the reinforced concrete cushion layer 100, wherein the upper ends of the vertical steel bars 130 are higher than the reinforced concrete cushion layer 100 by a certain height;

step S300: after the reinforced concrete cushion 100 is solidified, placing the box arch-shaped corrugated steel channel 200 on a cushion block or a pipe pillow on the reinforced concrete cushion 100, adjusting the height of the box arch-shaped corrugated steel channel to reach a designed elevation through the cushion block or the pipe pillow, and then fixedly connecting the bottom plate of the box arch-shaped corrugated steel channel 200 with the vertical steel bar 130;

step S400: filling premixed flow-state self-compacting solidified soil into a gap between the bottom plate of the box arch-shaped corrugated steel channel 200 and the reinforced concrete cushion 100 until the height of the flow-state solidified soil is flush with the two ends of the bottom plate of the box arch-shaped corrugated steel channel 200 to form a solidified soil filling layer 120;

step S500: and after the solidified soil filling layer 120 is solidified, backfilling materials on two sides of the box arch-shaped corrugated steel channel 200 until the foundation pit is filled and leveled.

In some embodiments, in order to save cost, the reinforced concrete cushion 100 and the solidified soil filling layer 120 are both cast by concrete, and the concrete can be prepared by mixing water and a solidifying agent with waste soil generated when a foundation pit for embedding the box arch-shaped corrugated steel channel 200 is dug, so that resource recovery is realized, and construction cost is reduced. During backfilling, the space on two sides of the box arch-shaped corrugated steel channel 200 is filled with backfill to form a lateral backfill layer, and then the space on the top of the box arch-shaped corrugated steel channel is filled with backfill until the foundation pit is filled to form a top backfill layer.